/* ============================================
   PROMPT COST CALCULATOR - Premium SaaS Design
   ============================================ */

:root {
    /* Core Colors - Matched to Logo Dark Blue-Black Background */
    --bg-primary: #13131f;
    --bg-secondary: #18182a;
    --bg-card: #1e1e32;
    --bg-elevated: #252540;

    /* Borders */
    --border: rgba(139, 134, 255, 0.08);
    --border-hover: rgba(139, 134, 255, 0.16);
    --border-focus: rgba(91, 127, 255, 0.5);

    /* Text */
    --text-primary: #fafafa;
    --text-secondary: #b4b4c7;
    --text-muted: #9898b0;

    /* Accent - Logo Blue-to-Purple Gradient Colors */
    --accent: #5B7FFF;
    --accent-light: #B794F6;
    --accent-dark: #4a6de6;
    --accent-purple: #D4A5FF;
    --accent-glow: rgba(91, 127, 255, 0.15);
    --accent-glow-strong: rgba(183, 148, 246, 0.25);

    /* Semantic */
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.08);
    --warning: #f59e0b;

    /* Gradients - Logo Blue-to-Purple Flow */
    --gradient-primary: linear-gradient(135deg, #5B7FFF 0%, #6B8AFF 30%, #B794F6 70%, #D4A5FF 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(91, 127, 255, 0.1) 0%, rgba(183, 148, 246, 0.05) 100%);
    --gradient-accent: linear-gradient(135deg, #5B7FFF 0%, #B794F6 100%);

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE
   ============================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    font-feature-settings: 'cv11', 'ss01';
}

/* ============================================
   APP WRAPPER & BACKGROUND
   ============================================ */

.app-wrapper {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

.bg-gradient {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}

.bg-gradient-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(91, 127, 255, 0.18) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation: float 20s ease-in-out infinite;
}

.bg-gradient-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(183, 148, 246, 0.12) 0%, transparent 70%);
    bottom: -150px;
    left: -100px;
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

/* ============================================
   HEADER
   ============================================ */

header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.logo-mark {
    display: flex;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.logo-icon {
    width: 64px;
    height: 64px;
    filter: drop-shadow(0 4px 20px rgba(91, 127, 255, 0.35)) drop-shadow(0 8px 32px rgba(183, 148, 246, 0.25));
    transition: transform var(--transition-base), filter var(--transition-base);
    border-radius: var(--radius-md);
}

.logo-icon:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 6px 24px rgba(91, 127, 255, 0.45)) drop-shadow(0 12px 40px rgba(183, 148, 246, 0.35));
}

header h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, #6B8AFF 50%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* ============================================
   TAB NAVIGATION
   ============================================ */

.tab-navigation {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.375rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.tab-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition:
        background var(--transition-base),
        color var(--transition-base),
        box-shadow var(--transition-base);
}

.tab-btn:hover {
    color: var(--text-secondary);
    background: var(--bg-elevated);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(91, 127, 255, 0.3), 0 4px 16px rgba(183, 148, 246, 0.2);
}

.tab-btn svg {
    opacity: 0.8;
}

.tab-btn.active svg {
    opacity: 1;
}

/* Tab Panels */
.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   INPUT SECTION
   ============================================ */

.input-section {
    margin-bottom: 2.5rem;
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.input-header label {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.input-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.input-badge svg {
    opacity: 0.6;
}

/* Header Actions (Code Analyzer) */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.language-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    background: var(--accent-glow);
    border: 1px solid rgba(91, 127, 255, 0.3);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-light);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.language-badge svg {
    opacity: 0.8;
}

.file-upload-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        background var(--transition-base),
        border-color var(--transition-base),
        color var(--transition-base);
}

.file-upload-btn:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.file-upload-btn svg {
    opacity: 0.7;
}

/* Code textarea styling */
#code-input {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    tab-size: 4;
}

.textarea-wrapper {
    position: relative;
}

textarea {
    width: 100%;
    padding: 1.125rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-family: inherit;
    line-height: 1.7;
    resize: vertical;
    transition:
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        background var(--transition-base);
}

textarea:hover {
    border-color: var(--border-hover);
    background: var(--bg-elevated);
}

textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    background: var(--bg-elevated);
    box-shadow:
        0 0 0 3px var(--accent-glow),
        0 1px 2px rgba(0, 0, 0, 0.1);
}

textarea::placeholder {
    color: var(--text-muted);
}

.textarea-glow {
    position: absolute;
    inset: 0;
    border-radius: var(--radius-md);
    pointer-events: none;
    opacity: 0;
    background: var(--gradient-primary);
    filter: blur(20px);
    z-index: -1;
    transition: opacity var(--transition-slow);
}

textarea:focus ~ .textarea-glow {
    opacity: 0.1;
}

.input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0.625rem 0 1.125rem;
    font-size: 0.8125rem;
}

#char-count {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.hint {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--text-muted);
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.5rem;
    padding: 0.125rem 0.375rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-secondary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn-primary {
    width: 100%;
    padding: 0.9375rem 1.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-base),
        opacity var(--transition-base);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.1),
        0 4px 12px rgba(91, 127, 255, 0.3),
        0 6px 20px rgba(183, 148, 246, 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.1),
        0 8px 24px rgba(91, 127, 255, 0.4),
        0 12px 32px rgba(183, 148, 246, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-text,
.btn-loading {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-icon {
    opacity: 0.9;
}

.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

/* ============================================
   RESULTS
   ============================================ */

.results {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Token Summary */
.token-summary {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin-bottom: 2rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--border);
}

.stat {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, rgba(91, 127, 255, 0.15) 0%, rgba(183, 148, 246, 0.1) 100%);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    color: #B794F6;
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-divider {
    width: 1px;
    height: 60px;
    background: var(--border);
}

/* Code Summary (3-stat version) */
.code-summary {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--border);
}

@media (max-width: 640px) {
    .code-summary {
        gap: 1rem;
    }

    .code-summary .stat-value {
        font-size: 1.5rem;
    }
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.section-badge {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
}

/* ============================================
   MODEL GRID
   ============================================ */

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.875rem;
    margin-bottom: 1.75rem;
}

.model-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition:
        border-color var(--transition-base),
        transform var(--transition-fast),
        box-shadow var(--transition-base);
}

.model-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.model-card.cheapest {
    border-color: var(--success);
    background: var(--success-bg);
}

.model-card.cheapest:hover {
    border-color: var(--success);
    box-shadow: 0 4px 16px rgba(34, 197, 94, 0.15);
}

.model-card .badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.625rem;
}

.model-card .badge.cheapest-badge {
    background: var(--success);
    color: white;
}

.model-card .name {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.model-card .cost {
    font-size: 1.375rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6B8AFF 0%, #B794F6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.model-card .cost-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ============================================
   CODE BREAKDOWN VISUALIZATION
   ============================================ */

/* Breakdown Chart (Horizontal Bar) */
.breakdown-chart {
    display: flex;
    height: 12px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 1.5rem;
    background: var(--bg-card);
}

.breakdown-chart-segment {
    height: 100%;
    transition: flex var(--transition-slow);
    position: relative;
}

.breakdown-chart-segment:first-child {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.breakdown-chart-segment:last-child {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Color scheme for code components - harmonized with logo palette */
.segment-functions { background: #5B7FFF; }
.segment-classes { background: #B794F6; }
.segment-docstrings { background: #22c55e; }
.segment-imports { background: #D4A5FF; }
.segment-comments { background: #6B8AFF; }
.segment-other_code { background: #7c7c9a; }

/* Breakdown Cards */
.breakdown-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.875rem;
    margin-bottom: 2rem;
}

.breakdown-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition:
        border-color var(--transition-base),
        transform var(--transition-fast);
}

.breakdown-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.breakdown-card-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 0.75rem;
}

.breakdown-card-indicator {
    width: 10px;
    height: 10px;
    border-radius: 3px;
    flex-shrink: 0;
}

.breakdown-card-name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
    letter-spacing: -0.01em;
}

.breakdown-card-stats {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.breakdown-card-tokens {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.breakdown-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.breakdown-card-percentage {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.125rem 0.375rem;
    background: var(--bg-elevated);
    border-radius: 4px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Progress bar within card */
.breakdown-card-progress {
    height: 4px;
    background: var(--bg-elevated);
    border-radius: 2px;
    margin-top: 0.625rem;
    overflow: hidden;
}

.breakdown-card-progress-fill {
    height: 100%;
    border-radius: 2px;
    transition: width var(--transition-slow);
}

/* Item details (functions/classes list) */
.breakdown-card-items {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.375rem 0;
    font-size: 0.75rem;
}

.breakdown-item:not(:last-child) {
    border-bottom: 1px solid var(--border);
}

.breakdown-item-name {
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.6875rem;
}

.breakdown-item-tokens {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.breakdown-item-docstring {
    width: 6px;
    height: 6px;
    background: var(--success);
    border-radius: 50%;
    margin-left: 0.375rem;
    flex-shrink: 0;
}

/* Responsive breakdown */
@media (max-width: 640px) {
    .breakdown-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .breakdown-card {
        padding: 0.875rem;
    }

    .breakdown-card-tokens {
        font-size: 1.125rem;
    }

    .breakdown-card-items {
        display: none;
    }
}

/* ============================================
   TIPS SECTION
   ============================================ */

.tips {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
}

.tips-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 1rem;
}

.tips-icon {
    color: #6B8AFF;
}

.tips h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.tips-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

.tips-list li svg {
    flex-shrink: 0;
    margin-top: 0.125rem;
    color: var(--success);
}

.tips-list li span {
    flex: 1;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    margin-top: 3.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

/* Footer Navigation Links */
.footer-calculators {
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.footer-nav-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.footer-nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.footer-nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.footer-nav-links a:hover {
    color: var(--accent);
}

.footer-nav-links .separator {
    color: var(--border);
}

/* Donate Section */
.donate-section {
    margin-bottom: 2.5rem;
}

.donate-card {
    position: relative;
    max-width: 380px;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.donate-glow {
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0.08;
    z-index: 0;
}

.donate-content {
    position: relative;
    z-index: 1;
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(20, 20, 24, 0.95) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
}

.donate-content::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
}

.donate-icon-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.donate-icon {
    color: #B794F6;
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    14% { transform: scale(1.1); }
    28% { transform: scale(1); }
    42% { transform: scale(1.1); }
    70% { transform: scale(1); }
}

.donate-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.donate-content > p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.btn-donate {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-donate:hover {
    background: var(--accent-glow);
    border-color: var(--accent-light);
    color: var(--accent-light);
}

.btn-donate:active {
    transform: translateY(0);
}

.donate-arrow {
    transition: transform var(--transition-base);
}

.btn-donate:hover .donate-arrow {
    transform: translateX(3px);
}

.powered-by {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.powered-by strong {
    display: block;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

/* Disclaimer */
.disclaimer {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.9;
}

.disclaimer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.disclaimer a:hover {
    color: #B794F6;
}

.disclaimer .separator {
    display: inline-block;
    width: 3px;
    height: 3px;
    background: var(--text-muted);
    border-radius: 50%;
    margin: 0 0.625rem;
    vertical-align: middle;
    opacity: 0.5;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 640px) {
    .container {
        padding: 2rem 1rem;
    }

    header {
        margin-bottom: 2.5rem;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
    }

    .tab-navigation {
        gap: 0.25rem;
        padding: 0.25rem;
    }

    .tab-btn {
        padding: 0.625rem 1rem;
        font-size: 0.8125rem;
    }

    .tab-btn svg {
        width: 14px;
        height: 14px;
    }

    .input-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .token-summary {
        gap: 1.5rem;
    }

    .stat-icon {
        width: 40px;
        height: 40px;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .stat-divider {
        height: 50px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .model-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .model-card {
        padding: 1rem;
    }

    .model-card .name {
        font-size: 0.8125rem;
    }

    .model-card .cost {
        font-size: 1.25rem;
    }

    .tips {
        padding: 1rem 1.25rem;
    }

    .tips-list li {
        font-size: 0.8125rem;
    }

    .donate-content {
        padding: 1.5rem;
    }

    .btn-donate {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .bg-gradient {
        display: none;
    }
}

/* ============================================
   MOBILE PERFORMANCE OPTIMIZATIONS
   Disable expensive GPU effects on mobile
   ============================================ */

@media (max-width: 768px), (hover: none) {
    /* Disable expensive blur filters on mobile */
    .bg-gradient {
        display: none !important;
    }

    /* Remove blur from textarea glow effect */
    .textarea-glow {
        display: none;
    }

    /* Simplify button glow - no blur */
    .btn-primary::before {
        display: none;
    }

    /* Reduce box-shadow complexity on buttons */
    .btn-primary {
        box-shadow: 0 2px 8px rgba(91, 127, 255, 0.3);
    }

    .btn-primary:hover:not(:disabled) {
        transform: none;
        box-shadow: 0 4px 12px rgba(91, 127, 255, 0.4);
    }

    /* Disable hover transforms on touch devices */
    .model-card:hover,
    .breakdown-card:hover,
    .btn-donate:hover {
        transform: none;
    }

    /* Simplify box-shadows on cards */
    .model-card:hover {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    }

    .tab-btn.active,
    .main-tab-btn.active {
        box-shadow: 0 2px 8px rgba(91, 127, 255, 0.25);
    }

    /* Disable heartbeat animation */
    .donate-icon {
        animation: none;
    }

    /* Remove scanner frame pseudo-elements */
    .textarea-wrapper::before,
    .textarea-wrapper::after {
        display: none;
    }

    /* Simplify logo filter */
    .logo-icon {
        filter: drop-shadow(0 2px 8px rgba(91, 127, 255, 0.3));
    }

    .logo-icon:hover {
        transform: none;
        filter: drop-shadow(0 2px 8px rgba(91, 127, 255, 0.3));
    }

    /* Reduce transition durations for snappier feel */
    :root {
        --transition-fast: 100ms ease;
        --transition-base: 150ms ease;
        --transition-slow: 200ms ease;
    }

    /* Disable glow effects on inputs */
    textarea:focus {
        box-shadow: 0 0 0 2px var(--accent-glow);
    }

    /* Simplified gradient text for mobile performance */
    header h1 {
        background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    /* Disable decorative pseudo-elements */
    .results::before,
    .results::after,
    .stat-icon::after,
    header::after {
        display: none;
    }
}

/* Focus styles for keyboard navigation */
:focus-visible {
    outline: 2px solid #5B7FFF;
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid #5B7FFF;
    outline-offset: 2px;
}

textarea:focus-visible {
    outline: none;
}

/* ============================================
   LOGO-INSPIRED DESIGN ELEMENTS
   Corner brackets and token dots
   ============================================ */

/* Corner bracket accent for cards - echoes logo's scanner frame */
.results::before,
.results::after,
.donate-content::before,
.donate-content::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    pointer-events: none;
}

.results {
    position: relative;
}

.results::before {
    top: -1px;
    left: -1px;
    border-top: 2px solid #5B7FFF;
    border-left: 2px solid #5B7FFF;
    border-top-left-radius: var(--radius-xl);
}

.results::after {
    top: -1px;
    right: -1px;
    border-top: 2px solid #B794F6;
    border-right: 2px solid #B794F6;
    border-top-right-radius: var(--radius-xl);
}

/* Bottom corner brackets using pseudo-elements on inner elements */
.results .tips::before,
.results .tips::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    pointer-events: none;
    bottom: -1.25rem;
}

.results .model-grid {
    position: relative;
}

/* Token dots decoration - echoes logo's data dots */
.stat-icon::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.6;
}

.stat-icon {
    position: relative;
}

/* Flowing curve accent on header */
header::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
    opacity: 0.5;
}

header {
    position: relative;
    padding-bottom: 1rem;
}

/* ============================================
   TRUST BADGES
   ============================================ */

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: border-color var(--transition-base), color var(--transition-base);
}

.trust-badge:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.trust-badge svg {
    color: var(--success);
    opacity: 0.9;
}

/* ============================================
   HERO DESCRIPTION (SEO)
   ============================================ */

.hero-description {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 2.5rem;
    padding: 1.5rem;
    background: var(--gradient-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.hero-description p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.hero-description strong {
    color: var(--text-primary);
    font-weight: 600;
}

.word-token-reference {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.word-token-reference strong {
    color: var(--accent-light);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Skip to main content link - Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    text-decoration: none;
    z-index: 10000;
    transition: top var(--transition-fast);
    box-shadow: 0 4px 20px rgba(91, 127, 255, 0.4);
}

.skip-link:focus {
    top: 1rem;
    outline: 2px solid var(--accent-light);
    outline-offset: 2px;
}

/* ============================================
   FAQ SECTION
   ============================================ */

.faq-section {
    margin-top: 3rem;
    padding: 2.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
}

.faq-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.faq-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: 2rem;
}

.faq-grid {
    display: grid;
    gap: 0.75rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-item[open] {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    cursor: pointer;
    user-select: none;
    list-style: none;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
    transition: background var(--transition-base);
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question:hover {
    background: var(--bg-elevated);
}

.faq-question span {
    flex: 1;
    padding-right: 1rem;
}

.faq-chevron {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition-base), color var(--transition-base);
}

.faq-item[open] .faq-chevron {
    transform: rotate(180deg);
    color: var(--accent);
}

.faq-answer {
    padding: 0 1.25rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.7;
    animation: faqFadeIn 0.3s ease;
}

@keyframes faqFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.faq-answer p {
    margin-bottom: 0.75rem;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer strong {
    color: var(--text-primary);
}

.faq-answer ul,
.faq-answer ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.faq-answer li {
    margin-bottom: 0.375rem;
}

.faq-reference {
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* FAQ Responsive */
@media (max-width: 640px) {
    .faq-section {
        padding: 1.5rem;
        margin-top: 2rem;
    }

    .faq-title {
        font-size: 1.25rem;
    }

    .faq-question {
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }

    .faq-answer {
        padding: 0 1rem 1rem;
        font-size: 0.8125rem;
    }

    .trust-badges {
        gap: 0.5rem;
    }

    .trust-badge {
        font-size: 0.6875rem;
        padding: 0.25rem 0.5rem;
    }

    .hero-description {
        padding: 1rem;
        margin-bottom: 2rem;
    }

    .hero-description p {
        font-size: 0.875rem;
    }

    .word-token-reference {
        font-size: 0.75rem;
        padding: 0.375rem 0.75rem;
    }
}

/* Enhanced glow effect for primary actions */
.btn-primary::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-primary);
    border-radius: calc(var(--radius-md) + 2px);
    opacity: 0;
    z-index: -1;
    filter: blur(12px);
    transition: opacity var(--transition-base);
}

.btn-primary {
    position: relative;
}

.btn-primary:hover::before {
    opacity: 0.4;
}

/* Scanner frame animation for focused textarea */
.textarea-wrapper::before,
.textarea-wrapper::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 2;
}

.textarea-wrapper::before {
    top: -1px;
    left: -1px;
    border-top: 2px solid #5B7FFF;
    border-left: 2px solid #5B7FFF;
    border-top-left-radius: var(--radius-md);
}

.textarea-wrapper::after {
    bottom: -1px;
    right: -1px;
    border-bottom: 2px solid #B794F6;
    border-right: 2px solid #B794F6;
    border-bottom-right-radius: var(--radius-md);
}

.textarea-wrapper:focus-within::before,
.textarea-wrapper:focus-within::after {
    opacity: 1;
}

/* Token dot pattern for visual interest */
.donate-content::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 20px;
    width: 40px;
    height: 40px;
    background-image: radial-gradient(circle, rgba(91, 127, 255, 0.3) 2px, transparent 2px);
    background-size: 10px 10px;
    opacity: 0.5;
    transform: translateY(-50%);
}

/* Override the donate-content ::before to keep gradient bar */
.donate-content::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 0;
    width: auto;
}

/* ============================================
   MAIN TAB NAVIGATION (Feature Tabs)
   ============================================ */

.main-tab-navigation {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    padding: 0.375rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-hover) transparent;
}

.main-tab-navigation::-webkit-scrollbar {
    height: 4px;
}

.main-tab-navigation::-webkit-scrollbar-track {
    background: transparent;
}

.main-tab-navigation::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 2px;
}

.main-tab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition:
        background var(--transition-base),
        color var(--transition-base),
        box-shadow var(--transition-base);
}

.main-tab-btn:hover {
    color: var(--text-secondary);
    background: var(--bg-elevated);
}

.main-tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(91, 127, 255, 0.3), 0 4px 16px rgba(183, 148, 246, 0.2);
}

.main-tab-btn svg {
    opacity: 0.7;
    flex-shrink: 0;
}

.main-tab-btn.active svg {
    opacity: 1;
}

.new-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.375rem;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    font-size: 0.5625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    margin-left: 0.25rem;
}

/* Main Tab Panels */
.main-tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.main-tab-panel.active {
    display: block;
}

/* ============================================
   FEATURE HEADER
   ============================================ */

.feature-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--gradient-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(91, 127, 255, 0.3);
}

.feature-title-section {
    flex: 1;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.feature-subtitle {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* ============================================
   MODEL SELECT DROPDOWN
   ============================================ */

.model-select {
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition-base), background var(--transition-base);
    max-width: 100%;
    min-width: 0;
}

.model-select:hover {
    border-color: var(--border-hover);
}

.model-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ============================================
   OPTIMIZER (Feature 1) STYLES
   ============================================ */

.optimizer-summary {
    display: flex;
    gap: 2rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

.savings-display {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.savings-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(22, 163, 74, 0.1));
    border-radius: var(--radius-lg);
    color: var(--success);
}

.savings-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.savings-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.savings-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success);
    letter-spacing: -0.03em;
    line-height: 1;
}

.savings-tokens {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.token-comparison {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
}

.token-before,
.token-after {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.token-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.token-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.token-before .token-number {
    color: var(--text-secondary);
    text-decoration: line-through;
    opacity: 0.7;
}

.token-after .token-number {
    color: var(--success);
}

.token-arrow {
    color: var(--accent);
}

/* Optimizer Breakdown */
.optimizer-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.optimizer-breakdown-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.optimizer-breakdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.optimizer-breakdown-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.optimizer-breakdown-percentage {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-light);
    padding: 0.125rem 0.375rem;
    background: var(--accent-glow);
    border-radius: 4px;
}

.optimizer-breakdown-bar {
    height: 8px;
    background: var(--bg-elevated);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.optimizer-breakdown-fill {
    height: 100%;
    border-radius: 4px;
    transition: width var(--transition-slow);
}

.optimizer-breakdown-tokens {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Optimization Suggestions */
.optimization-suggestions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.optimization-suggestion {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base), transform var(--transition-fast);
}

.optimization-suggestion:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.optimization-suggestion.high-impact {
    border-left: 3px solid var(--success);
}

.optimization-suggestion.medium-impact {
    border-left: 3px solid var(--warning);
}

.optimization-suggestion.low-impact {
    border-left: 3px solid var(--accent);
}

.suggestion-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.suggestion-icon.high-impact {
    color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.suggestion-icon.medium-impact {
    color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.suggestion-icon.low-impact {
    color: var(--accent);
    background: var(--accent-glow);
}

.suggestion-content {
    flex: 1;
}

.suggestion-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.suggestion-description {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.suggestion-savings {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    margin-top: 0.5rem;
}

/* Optimizer Actions */
.optimizer-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition:
        background var(--transition-base),
        border-color var(--transition-base),
        transform var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-primary-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: 2px solid var(--accent);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    cursor: pointer;
    transition:
        background var(--transition-base),
        color var(--transition-base),
        transform var(--transition-fast);
}

.btn-primary-outline:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
}

/* Optimized Code Container */
.optimized-code-container {
    margin-top: 1.5rem;
}

.code-diff {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-display {
    margin: 0;
    padding: 1.25rem;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: auto;
    white-space: pre;
}

.quality-notice {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    margin-top: 1rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.quality-notice svg {
    color: var(--accent);
    flex-shrink: 0;
}

.success-badge {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

/* ============================================
   TRAJECTORY (Feature 2) STYLES
   ============================================ */

.trajectory-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.trajectory-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.trajectory-input-group label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.trajectory-input-group input[type="number"] {
    padding: 0.625rem 0.875rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.trajectory-input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.trajectory-input-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    outline: none;
}

.trajectory-input-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(91, 127, 255, 0.4);
    transition: transform var(--transition-fast);
}

.trajectory-input-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-light);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Trajectory Chart */
.trajectory-chart-container {
    margin-bottom: 2rem;
}

.trajectory-chart {
    height: 300px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    position: relative;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 100%;
    padding: 1rem 0;
}

.chart-bar {
    flex: 1;
    background: var(--gradient-primary);
    border-radius: 4px 4px 0 0;
    min-width: 20px;
    position: relative;
    transition: height var(--transition-slow);
}

.chart-bar.warning {
    background: linear-gradient(180deg, var(--warning), #d97706);
}

.chart-bar.danger {
    background: linear-gradient(180deg, #ef4444, #dc2626);
}

.chart-bar-label {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.625rem;
    color: var(--text-muted);
}

.chart-bar-value {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 60px;
}

/* Trajectory Table */
.trajectory-table-container {
    margin-bottom: 2rem;
}

.trajectory-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.trajectory-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

.trajectory-table th {
    padding: 0.875rem 1rem;
    background: var(--bg-card);
    font-weight: 600;
    text-align: left;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.trajectory-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.trajectory-table tr:last-child td {
    border-bottom: none;
}

.trajectory-table tr:hover {
    background: var(--bg-elevated);
}

.status-ok {
    color: var(--success);
    font-weight: 500;
}

.status-caution {
    color: #f59e0b;
    font-weight: 500;
}

.status-warning {
    color: #f97316;
    font-weight: 500;
}

.status-danger {
    color: #ef4444;
    font-weight: 500;
}

/* Trajectory Recommendation */
.trajectory-recommendation {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(91, 127, 255, 0.1), rgba(183, 148, 246, 0.05));
    border: 1px solid var(--accent);
    border-radius: var(--radius-lg);
}

.recommendation-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: white;
    flex-shrink: 0;
}

.recommendation-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.recommendation-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   PIPELINE (Feature 3) STYLES
   ============================================ */

.pipeline-stages {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}

.pipeline-stage {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: border-color var(--transition-base);
}

.pipeline-stage:hover {
    border-color: var(--border-hover);
}

.stage-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stage-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.stage-name {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.stage-name:focus {
    outline: none;
    border-color: var(--border-focus);
}

.remove-stage-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.remove-stage-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #ef4444;
}

.stage-inputs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.stage-input {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.stage-input label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stage-input select,
.stage-input input {
    padding: 0.5rem 0.625rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    color: var(--text-primary);
}

.stage-input select:focus,
.stage-input input:focus {
    outline: none;
    border-color: var(--border-focus);
}

.pipeline-settings {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
}

.pipeline-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.pipeline-input-group label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.pipeline-input-group input {
    padding: 0.625rem 0.875rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    width: 150px;
}

.pipeline-input-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Pipeline Summary */
.pipeline-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.pipeline-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.pipeline-stat-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pipeline-stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6B8AFF 0%, #B794F6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Pipeline Breakdown */
.pipeline-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.pipeline-stage-result {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.pipeline-stage-info {
    flex: 1;
}

.pipeline-stage-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.pipeline-stage-model {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pipeline-stage-cost {
    text-align: right;
}

.pipeline-stage-cost-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.pipeline-stage-percentage {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pipeline-stage-bar {
    width: 100px;
    height: 8px;
    background: var(--bg-elevated);
    border-radius: 4px;
    overflow: hidden;
}

.pipeline-stage-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
}

.pipeline-stage-bar-fill.dominant {
    background: linear-gradient(135deg, var(--warning), #d97706);
}

/* Pipeline Optimizations */
.pipeline-optimizations {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pipeline-optimization-card {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: rgba(34, 197, 94, 0.05);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: var(--radius-md);
}

.optimization-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: var(--radius-sm);
    color: var(--success);
    flex-shrink: 0;
}

.optimization-content h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.optimization-content p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.optimization-savings {
    margin-left: auto;
    font-size: 1rem;
    font-weight: 700;
    color: var(--success);
    white-space: nowrap;
}

/* ============================================
   MODEL FINDER (Feature 4) STYLES
   ============================================ */

.finder-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.finder-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Quality requirement group needs more space for buttons */
.finder-input-group-wide,
.finder-input-group:has(.quality-buttons) {
    grid-column: 1 / -1;
}

.finder-input-group label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.finder-input-group input[type="text"],
.finder-input-group input[type="number"] {
    padding: 0.625rem 0.875rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    width: 100%;
    box-sizing: border-box;
}

.finder-input-group input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Quality Buttons */
.quality-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.quality-btn {
    flex: 1 1 auto;
    min-width: 70px;
    padding: 0.625rem 0.875rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    white-space: nowrap;
}

.quality-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-secondary);
}

.quality-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

/* Model Recommendations */
.model-recommendations {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.model-recommendation-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base), transform var(--transition-fast);
}

.model-recommendation-card:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.model-recommendation-card.best-value {
    border: 2px solid var(--success);
    background: rgba(34, 197, 94, 0.05);
}

.model-recommendation-card.overkill {
    opacity: 0.6;
}

.model-recommendation-card.below-threshold {
    border-color: #ef4444;
    opacity: 0.5;
}

.model-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-elevated);
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-muted);
    flex-shrink: 0;
}

.model-recommendation-card.best-value .model-rank {
    background: var(--success);
    color: white;
}

.model-info {
    flex: 1;
}

.model-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.model-provider {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.model-stats {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.model-cost,
.model-accuracy {
    text-align: center;
}

.model-cost-value,
.model-accuracy-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.model-cost-label,
.model-accuracy-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.model-tag {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.6875rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}

.model-tag.best-value {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.model-tag.overkill {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.model-tag.below-threshold {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.model-tag.over-budget {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

/* Recommendation Callout */
.finder-summary {
    margin-top: 1rem;
}

.recommendation-callout {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(22, 163, 74, 0.05));
    border: 1px solid var(--success);
    border-radius: var(--radius-lg);
}

.callout-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--success);
    border-radius: 50%;
    color: white;
    flex-shrink: 0;
}

.callout-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.callout-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   PATTERNS LIBRARY (Feature 5) STYLES
   ============================================ */

.pattern-filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.pattern-filter {
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-base);
}

.pattern-filter:hover {
    border-color: var(--border-hover);
    color: var(--text-secondary);
}

.pattern-filter.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.patterns-library {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pattern-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.pattern-card:hover {
    border-color: var(--border-hover);
}

.pattern-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    cursor: pointer;
    transition: background var(--transition-base);
}

.pattern-card-header:hover {
    background: var(--bg-elevated);
}

.pattern-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.pattern-header-content {
    flex: 1;
}

.pattern-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.pattern-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pattern-savings-badge {
    padding: 0.25rem 0.5rem;
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    font-weight: 600;
    border-radius: 4px;
}

.pattern-quality-badge {
    padding: 0.25rem 0.5rem;
    background: var(--accent-glow);
    color: var(--accent-light);
    font-weight: 600;
    border-radius: 4px;
}

.pattern-chevron {
    color: var(--text-muted);
    transition: transform var(--transition-base);
}

.pattern-card.expanded .pattern-chevron {
    transform: rotate(180deg);
}

.pattern-card-body {
    display: none;
    padding: 0 1.25rem 1.25rem;
    border-top: 1px solid var(--border);
}

.pattern-card.expanded .pattern-card-body {
    display: block;
}

.pattern-section {
    margin-top: 1rem;
}

.pattern-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.pattern-code-block {
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 0.75rem;
}

.pattern-code-label {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.pattern-code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.8125rem;
    color: var(--text-primary);
    line-height: 1.6;
    white-space: pre-wrap;
}

.pattern-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 0.75rem;
}

.pattern-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.pattern-tag {
    padding: 0.25rem 0.5rem;
    background: var(--bg-elevated);
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE FOR NEW FEATURES
   ============================================ */

@media (max-width: 768px) {
    .main-tab-navigation {
        gap: 0.125rem;
        padding: 0.25rem;
    }

    .main-tab-btn {
        padding: 0.5rem 0.625rem;
        font-size: 0.6875rem;
    }

    .main-tab-btn svg {
        width: 14px;
        height: 14px;
    }

    .new-badge {
        font-size: 0.5rem;
        padding: 1px 3px;
    }

    .feature-header {
        flex-direction: column;
        text-align: center;
        padding: 1.25rem;
    }

    .feature-icon {
        width: 56px;
        height: 56px;
    }

    .feature-title {
        font-size: 1.25rem;
    }

    .optimizer-summary {
        flex-direction: column;
        gap: 1.5rem;
    }

    .savings-display {
        flex-direction: column;
        text-align: center;
    }

    .token-comparison {
        width: 100%;
        justify-content: center;
    }

    .trajectory-inputs,
    .finder-inputs {
        grid-template-columns: 1fr;
    }

    .stage-inputs {
        grid-template-columns: repeat(2, 1fr);
    }

    .pipeline-summary {
        grid-template-columns: 1fr;
    }

    .quality-buttons {
        flex-wrap: wrap;
        gap: 0.375rem;
    }

    .quality-btn {
        flex: 1 1 calc(50% - 0.25rem);
        min-width: calc(50% - 0.25rem);
        padding: 0.5rem 0.625rem;
        font-size: 0.75rem;
    }

    .model-recommendation-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .model-stats {
        width: 100%;
        justify-content: space-between;
    }

    .pattern-filters {
        gap: 0.375rem;
    }

    .pattern-filter {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }

    /* Model tag positioning for mobile cards */
    .model-recommendation-card .model-tag {
        align-self: flex-start;
    }
}

/* Tablet breakpoint for better quality button sizing */
@media (min-width: 769px) and (max-width: 1024px) {
    .quality-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
    }

    .finder-inputs {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================
   How Token Counting Works - Educational Section
   ============================================ */

.how-it-works-section {
    margin-bottom: 2rem;
}

.how-it-works-details {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.how-it-works-details:hover {
    border-color: var(--border-hover);
}

.how-it-works-details[open] {
    border-color: var(--border-focus);
}

.how-it-works-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    list-style: none;
    user-select: none;
}

.how-it-works-summary::-webkit-details-marker {
    display: none;
}

.how-it-works-summary .faq-chevron {
    transition: transform var(--transition-base);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.how-it-works-details[open] .how-it-works-summary .faq-chevron {
    transform: rotate(180deg);
}

.how-it-works-content {
    padding: 0 1.25rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.7;
}

.how-it-works-content p {
    margin-bottom: 0.75rem;
}

.how-it-works-content p:last-child {
    margin-bottom: 0;
}

.how-it-works-content strong {
    color: var(--text-primary);
}

/* Last Updated Footer Badge */
.last-updated-badge {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* ============================================
   STICKY NAVIGATION HEADER
   ============================================ */

.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(19, 19, 31, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-nav-brand {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.site-nav-brand img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.site-nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav-links a {
    display: block;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: color 0.15s ease, background 0.15s ease;
}

.site-nav-links a:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

@media (max-width: 640px) {
    .site-nav-links {
        display: none;
    }
}

/* ============================================
   STAR RATING DISPLAY
   ============================================ */

.star-rating-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin: 0.75rem 0;
}

.star-rating-stars {
    display: flex;
    gap: 2px;
    color: #f59e0b;
}

.star-rating-stars svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.star-rating-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.star-rating-count {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   FEATURE DISCOVERY GRID
   ============================================ */

.feature-discovery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.feature-discovery-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    text-align: left;
    font-family: inherit;
    color: inherit;
}

.feature-discovery-card:hover {
    transform: translateY(-2px);
    border-color: var(--border-hover);
    box-shadow: 0 8px 24px rgba(91, 127, 255, 0.12);
}

.feature-discovery-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
}

.feature-discovery-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.feature-discovery-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.feature-discovery-link {
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
}

.feature-discovery-link:hover {
    color: var(--accent-light);
}

@media (max-width: 768px) {
    .feature-discovery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .feature-discovery-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   PROVIDER-SPECIFIC MODEL CARD ACCENTS
   ============================================ */

.model-card[data-provider="openai"] {
    border-left: 3px solid #10a37f;
}
.model-card[data-provider="anthropic"] {
    border-left: 3px solid #d4763c;
}
.model-card[data-provider="google"] {
    border-left: 3px solid #4285f4;
}
.model-card[data-provider="deepseek"] {
    border-left: 3px solid #6366f1;
}

/* ============================================
   FAQ 2-COLUMN LAYOUT
   ============================================ */

@media (min-width: 768px) {
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

.faq-category-header {
    grid-column: 1 / -1;
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================
   MOBILE TAB NAVIGATION - 2-ROW GRID
   ============================================ */

@media (max-width: 640px) {
    .main-tab-navigation {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.25rem;
    }
    .main-tab-btn {
        width: 100%;
        justify-content: center;
        padding: 0.5rem 0.25rem;
        font-size: 0.6875rem;
        text-align: center;
    }
    .new-badge {
        display: inline-flex;
        font-size: 0.5rem;
        padding: 1px 3px;
    }
}