/* ═══════════════════════════════════════════════════════════════
   Kalam Design System — Shared Theme
   Extracted from the design-system.html reference.
   Every public page <link>s this file.
   ═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
    /* Core Colors */
    --bg-base: #070a10;
    --bg-surface: #0f1522;
    --bg-surface-hover: #161e30;
    --header-bg: rgba(7, 10, 16, 0.8);

    --fg-primary: #ffffff;
    --fg-secondary: #a1a1aa;
    --fg-tertiary: #71717a;

    /* Accents */
    --accent-primary: #4ABBC7;
    --accent-primary-hover: #3AA1AC;
    --accent-primary-fg: #000000;
    --accent-secondary: #133051;

    /* Semantic */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Borders & Dividers */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);

    /* Typography */
    --font-display: 'Bricolage Grotesque', sans-serif;
    --font-body: 'Manrope', sans-serif;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-24: 6rem;

    /* Radii */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows & Effects */
    --shadow-glow: 0 0 40px rgba(74, 187, 199, 0.15);
    --glass-bg: rgba(15, 21, 34, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);

    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out-circ: cubic-bezier(0.85, 0, 0.15, 1);
    --duration-fast: 200ms;
    --duration-normal: 400ms;
    --duration-slow: 800ms;
}

/* ── Light Theme ── */
[data-theme="light"] {
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f1f5f9;
    --header-bg: rgba(248, 250, 252, 0.8);

    --fg-primary: #0f172a;
    --fg-secondary: #475569;
    --fg-tertiary: #64748b;

    --accent-primary: #4ABBC7;
    --accent-primary-hover: #3AA1AC;
    --accent-primary-fg: #ffffff;
    --accent-secondary: #133051;

    --border-subtle: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.15);

    --shadow-glow: 0 0 40px rgba(74, 187, 199, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.05);
}

/* ── Reset & Base ── */
html { scroll-behavior: smooth; }
* { box-sizing: border-box; margin: 0; padding: 0; }

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--radius-full);
    border: 3px solid var(--bg-base);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-tertiary); }

body {
    background-color: var(--bg-base);
    color: var(--fg-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(74, 187, 199, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(19, 48, 81, 0.15), transparent 25%);
    background-attachment: fixed;
    transition: background-color var(--duration-normal), color var(--duration-normal);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--duration-fast);
}
a:hover {
    color: var(--accent-primary-hover);
    text-decoration: underline;
}

/* Noise Texture Overlay */
body::before {
    content: "";
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    transition: opacity var(--duration-normal), filter var(--duration-normal);
}
[data-theme="light"] body::before {
    opacity: 0.04;
    filter: invert(1);
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
}

.text-display-lg { font-size: clamp(3rem, 8vw, 6rem); letter-spacing: -0.04em; line-height: 1; }
.text-display-md { font-size: clamp(2.5rem, 5vw, 4rem); }
.text-display-sm { font-size: clamp(2rem, 4vw, 3rem); }

.text-body-lg { font-size: 1.25rem; color: var(--fg-secondary); }
.text-body-md { font-size: 1rem; color: var(--fg-secondary); }
.text-body-sm { font-size: 0.875rem; color: var(--fg-tertiary); }

/* ── Layout ── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
    border-bottom: 1px solid var(--border-subtle);
}

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-8); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--space-6); }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0 var(--space-6);
    height: 3.5rem;
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.125rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out-expo);
    border: none;
    position: relative;
    overflow: hidden;
}
.btn:hover { text-decoration: none; }

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--accent-primary-fg);
    box-shadow: 0 4px 20px rgba(74, 187, 199, 0.2);
}
.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    color: var(--accent-primary-fg);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(74, 187, 199, 0.3);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--fg-primary);
    border: 1px solid var(--border-strong);
}
.btn-secondary:hover {
    background-color: var(--bg-surface-hover);
    border-color: var(--fg-secondary);
    transform: translateY(-2px);
}

.btn-ghost {
    background-color: transparent;
    color: var(--fg-primary);
}
.btn-ghost:hover {
    background-color: var(--border-subtle);
}

.btn-sm {
    height: 2.5rem;
    padding: 0 var(--space-4);
    font-size: 0.9375rem;
}

/* ── Cards ── */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: transform var(--duration-normal) var(--ease-out-expo), border-color var(--duration-fast), background-color var(--duration-normal);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity var(--duration-normal);
}
.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-strong);
}
.card:hover::before { opacity: 1; }

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--fg-secondary);
}
.badge-accent {
    background-color: rgba(74, 187, 199, 0.1);
    color: var(--accent-primary);
    border-color: rgba(74, 187, 199, 0.2);
}

/* Badge/pill + heading row — baseline aligns label with first line of title (center often looks “off”) */
.section-kicker {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}
.section-kicker .badge {
    flex-shrink: 0;
    line-height: 1;
    transform: translateY(0.04em);
}
.section-kicker-title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--fg-primary);
}

/* Compare table: name + trailing badge in <th> */
.compare-th-split {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-3);
    flex-wrap: wrap;
}
.compare-th-split .compare-th-name {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
}
.compare-th-split .badge {
    flex-shrink: 0;
    line-height: 1;
    transform: translateY(0.04em);
}

/* Footer: logo + wordmark (icon has no text baseline — center) */
.footer-brand-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}
.footer-col .footer-brand-row h4 {
    margin: 0;
    line-height: 1.2;
}

/* ── Inputs ── */
.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}
.input-label {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--fg-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.input-field {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0 var(--space-4);
    height: 3.5rem;
    color: var(--fg-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--duration-fast);
    width: 100%;
}
.input-field:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(74, 187, 199, 0.1);
}

/* ── Accordion / FAQ ── */
.accordion {
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-surface);
    margin-bottom: var(--space-4);
    transition: border-color var(--duration-fast);
}
.accordion:hover { border-color: var(--border-strong); }
.accordion-header {
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--fg-primary);
    user-select: none;
}
.accordion-content {
    padding: 0 var(--space-6);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-normal) var(--ease-out-expo), padding var(--duration-normal);
    color: var(--fg-secondary);
}
.accordion.open .accordion-content {
    padding: 0 var(--space-6) var(--space-4) var(--space-6);
    max-height: 500px;
}
.accordion-icon {
    transition: transform var(--duration-fast);
    color: var(--accent-primary);
}
.accordion.open .accordion-icon { transform: rotate(180deg); }

/* ── Marquee / Integrations ── */
.marquee-container {
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    width: 100%;
    padding: var(--space-8) 0;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}
.marquee-content {
    display: inline-flex;
    gap: var(--space-12);
    animation: marquee 45s linear infinite;
}
@media (prefers-reduced-motion: reduce) {
    .marquee-content { animation: none; }
}
.marquee-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--fg-tertiary);
    opacity: 0.6;
    transition: opacity var(--duration-fast), color var(--duration-fast);
}
.marquee-item:hover { opacity: 1; color: var(--fg-primary); }
.marquee-item i { font-size: 2rem; }
.marquee-si-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem; height: 2rem;
    flex-shrink: 0;
}
.marquee-item img.marquee-si {
    height: 1.5rem; width: auto; max-width: 1.75rem;
    object-fit: contain; display: block;
    transition: opacity var(--duration-fast), filter var(--duration-fast);
}
[data-theme="dark"] .marquee-item img.marquee-si { filter: brightness(0) invert(1); opacity: 0.88; }
[data-theme="light"] .marquee-item img.marquee-si { filter: brightness(0) saturate(100%); opacity: 0.78; }
.marquee-item:hover img.marquee-si { opacity: 1; }
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ── Comparison Table ── */
.compare-section .compare-lede { max-width: 48rem; margin-bottom: var(--space-12); }
.compare-lede a { color: var(--accent-primary); text-decoration: none; font-weight: 500; transition: color var(--duration-fast); }
.compare-lede a:hover { color: var(--accent-primary-hover); text-decoration: underline; }
.compare-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 0;
    margin: var(--space-4) 0;
}
[data-theme="dark"] .compare-scroll { box-shadow: 0 24px 56px rgba(0, 0, 0, 0.45), var(--shadow-glow); }
.compare-table { width: 100%; min-width: 800px; border-collapse: collapse; font-size: 0.9375rem; text-align: left; }
.compare-table th, .compare-table td {
    padding: var(--space-6) var(--space-8);
    vertical-align: middle;
    border-bottom: 1px solid var(--border-subtle);
    line-height: 1.5;
    color: var(--fg-secondary);
}
.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table thead th {
    font-family: var(--font-display);
    font-weight: 600; font-size: 1.125rem;
    color: var(--fg-primary);
    padding-top: var(--space-8); padding-bottom: var(--space-8);
    background: var(--bg-surface-hover);
}
.compare-table tbody th[scope="row"] { font-weight: 600; color: var(--fg-primary); width: 25%; background: var(--bg-surface); }
.compare-table th:nth-child(2) { background: rgba(74, 187, 199, 0.1); color: var(--accent-primary); border-top: 2px solid var(--accent-primary); }
.compare-table td:nth-child(2) {
    background: rgba(74, 187, 199, 0.03); color: var(--fg-primary); font-weight: 500;
    border-left: 1px solid rgba(74, 187, 199, 0.1); border-right: 1px solid rgba(74, 187, 199, 0.1);
}
[data-theme="light"] .compare-table td:nth-child(2) { background: rgba(74, 187, 199, 0.05); }
.compare-table tbody tr:last-child td:nth-child(2) { border-bottom: 2px solid var(--accent-primary); }
.compare-icon { font-size: 1.25rem; vertical-align: middle; margin-right: var(--space-2); }
.compare-icon-check { color: var(--accent-primary); }
.compare-icon-x { color: var(--fg-tertiary); opacity: 0.5; }
.compare-foot { margin-top: var(--space-6); font-size: 0.875rem; color: var(--fg-tertiary); max-width: 48rem; line-height: 1.6; }
.compare-foot a { color: var(--accent-primary); text-decoration: none; }
.compare-foot a:hover { text-decoration: underline; }

@media (max-width: 768px) {
    .compare-scroll {
        overflow-x: visible;
        background: transparent;
        border: none;
        box-shadow: none !important;
        padding: 0;
        margin: var(--space-6) 0;
    }
    .compare-table {
        min-width: 0;
        display: block;
    }
    .compare-table thead {
        display: none;
    }
    .compare-table tbody, .compare-table tr, .compare-table td, .compare-table th {
        display: block;
        width: 100%;
    }
    .compare-table tr {
        margin-bottom: var(--space-6);
        background: var(--bg-surface);
        border: 1px solid var(--border-subtle);
        border-radius: var(--radius-lg);
        overflow: hidden;
    }
    .compare-table tbody th[scope="row"] {
        width: 100%;
        background: var(--bg-surface-hover);
        padding: var(--space-4) var(--space-6);
        font-family: var(--font-display);
        font-size: 1.125rem;
        border-bottom: 1px solid var(--border-subtle);
        text-align: left;
    }
    .compare-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--space-4) var(--space-6);
        border-bottom: 1px solid var(--border-subtle);
        text-align: right;
    }
    .compare-table td::before {
        content: attr(data-label);
        font-family: var(--font-display);
        font-weight: 600;
        color: var(--fg-secondary);
        text-align: left;
        margin-right: var(--space-4);
    }
    .compare-table td:last-child {
        border-bottom: none;
    }
    .compare-table td:nth-child(2) {
        background: rgba(74, 187, 199, 0.05);
        border-left: none;
        border-right: none;
    }
    .compare-table tbody tr:last-child td:nth-child(2) {
        border-bottom: 1px solid var(--border-subtle);
    }
    .compare-table tbody tr:last-child td:last-child {
        border-bottom: none;
    }
}

/* ── Review Wall ── */
@keyframes review-scroll-up   { from { transform: translate3d(0, 0, 0); }   to { transform: translate3d(0, -50%, 0); } }
@keyframes review-scroll-down { from { transform: translate3d(0, -50%, 0); } to { transform: translate3d(0, 0, 0); } }
@keyframes review-edge-breathe { 0%, 100% { opacity: 0.92; } 50% { opacity: 1; } }

.review-wall { display: grid; grid-template-columns: 1fr; gap: var(--space-6); max-width: 1200px; margin: 0 auto; }
@media (min-width: 768px)  { .review-wall { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .review-wall { grid-template-columns: repeat(3, 1fr); } }

.review-wall-mobile { display: none; }
@media (max-width: 768px) {
    .review-wall { display: none; }
    .review-wall-mobile {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        gap: var(--space-4);
        margin: 0 calc(var(--space-6) * -1);
        padding: var(--space-2) var(--space-6) var(--space-8);
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }
    .review-wall-mobile::-webkit-scrollbar { display: none; }
    .review-wall-mobile .review-card {
        scroll-snap-align: center;
        min-width: 85vw;
        flex-shrink: 0;
        transform: none !important; /* Disable hover lift on mobile swipe */
    }
}

.review-wall-col {
    position: relative;
    height: clamp(22rem, 58vh, 36rem);
    overflow: hidden;
    border-radius: var(--radius-xl);
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 12%, black 88%, transparent 100%);
    mask-image: linear-gradient(to bottom, transparent 0%, black 12%, black 88%, transparent 100%);
}
.review-wall-col::after {
    content: ''; position: absolute; inset: 0; pointer-events: none; border-radius: inherit;
    box-shadow: inset 0 0 50px 12px var(--bg-base); opacity: 0.85;
    animation: review-edge-breathe 7s var(--ease-in-out-circ) infinite;
}
.review-wall-track { display: flex; flex-direction: column; gap: var(--space-6); width: 100%; will-change: transform; }
.review-wall-col--up .review-wall-track   { animation: review-scroll-up   var(--review-dur, 42s) linear infinite; }
.review-wall-col--down .review-wall-track { animation: review-scroll-down var(--review-dur, 48s) linear infinite; }
.review-wall-col:nth-child(1) { --review-dur: 44s; }
.review-wall-col:nth-child(2) { --review-dur: 52s; }
.review-wall-col:nth-child(3) { --review-dur: 39s; }
.review-wall-col:hover .review-wall-track { animation-play-state: paused; }

@media (prefers-reduced-motion: reduce) {
    .review-wall-col::after { animation: none; opacity: 0.6; }
    .review-wall-col--up .review-wall-track,
    .review-wall-col--down .review-wall-track { animation: none; transform: none; }
    .review-wall-col { height: auto; overflow: visible; -webkit-mask-image: none; mask-image: none; }
}

.review-card {
    flex-shrink: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: transform var(--duration-fast) var(--ease-out-expo), border-color var(--duration-fast), box-shadow var(--duration-normal) var(--ease-out-expo);
}
.review-card:hover {
    transform: translateY(-3px) scale(1.01);
    border-color: var(--border-strong);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25), var(--shadow-glow);
}
.review-header { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); }
.review-avatar {
    width: 40px; height: 40px; border-radius: var(--radius-full);
    background: var(--border-strong); display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: var(--fg-primary);
}
.review-stars { color: var(--warning); font-size: 0.875rem; margin-bottom: var(--space-2); }

/* ── Pricing / Licensing ── */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-6); align-items: stretch; }
.pricing-card {
    background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-xl);
    padding: var(--space-8); display: flex; flex-direction: column; position: relative; overflow: hidden;
    transition: transform var(--duration-normal), border-color var(--duration-fast);
}
.pricing-card:hover { transform: translateY(-4px); }
.pricing-card.featured {
    border-color: var(--accent-primary);
    background: linear-gradient(180deg, rgba(74, 187, 199, 0.05) 0%, transparent 100%), var(--bg-surface);
    box-shadow: var(--shadow-glow);
}
.pricing-card.featured::before {
    content: 'Commercial';
    position: absolute; top: 0; right: 0;
    background: var(--accent-primary); color: var(--accent-primary-fg);
    font-size: 0.75rem; font-weight: 700;
    padding: var(--space-1) var(--space-4);
    border-bottom-left-radius: var(--radius-lg);
    text-transform: uppercase; letter-spacing: 0.05em;
}
.pricing-price {
    font-family: var(--font-display); font-size: 3rem; font-weight: 700; color: var(--fg-primary);
    margin: var(--space-4) 0; display: flex; align-items: baseline; gap: var(--space-2);
}
.pricing-features { list-style: none; margin: var(--space-6) 0; flex-grow: 1; }
.pricing-features li { display: flex; align-items: flex-start; gap: var(--space-3); margin-bottom: var(--space-3); color: var(--fg-secondary); }
.pricing-features i { color: var(--accent-primary); margin-top: 2px; }

/* ── Site Header / Nav ── */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: background-color var(--duration-normal), border-color var(--duration-normal);
}
.site-header .container {
    display: flex; align-items: center; justify-content: space-between;
    height: 4rem;
}
.site-header-logo {
    display: flex; align-items: center; gap: var(--space-3);
    text-decoration: none; color: var(--fg-primary);
}
.site-header-logo:hover { text-decoration: none; color: var(--fg-primary); }
.site-header-logo img { height: 40px; width: auto; }
.site-header-logo span {
    font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
    letter-spacing: -0.02em;
}
.site-nav { display: flex; align-items: center; gap: var(--space-6); }
.site-nav a {
    color: var(--fg-secondary); text-decoration: none;
    font-family: var(--font-display); font-weight: 500; font-size: 0.9375rem;
    transition: color var(--duration-fast);
}
.site-nav a:hover { color: var(--fg-primary); text-decoration: none; }
.site-nav a.active { color: var(--accent-primary); }
.site-nav a.site-nav-github {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}
.site-nav a.site-nav-github i {
    font-size: 1.125rem;
    line-height: 1;
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; color: var(--fg-primary); font-size: 1.5rem; cursor: pointer; padding: var(--space-2); }
@media (max-width: 768px) {
    .nav-toggle { display: flex; align-items: center; }
    .site-nav {
        position: fixed; top: 4rem; left: 0; right: 0;
        height: calc(100vh - 4rem); height: calc(100dvh - 4rem);
        flex-direction: column; align-items: center; justify-content: flex-start;
        padding-top: var(--space-12); gap: var(--space-6);
        /* Blur + dense scrim: token-tinted so body copy doesn’t read through; keep a sliver of transparency so backdrop-filter stays visible. */
        background: color-mix(in srgb, var(--bg-base) 96%, transparent);
        backdrop-filter: blur(48px) saturate(200%);
        -webkit-backdrop-filter: blur(48px) saturate(200%);
        border-top: 1px solid var(--glass-border);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02), 0 20px 60px rgba(0, 0, 0, 0.8);
        z-index: 99;
        transform: translateX(100%); transition: transform var(--duration-normal) var(--ease-out-expo);
        isolation: isolate;
    }
    [data-theme="light"] .site-nav {
        background: color-mix(in srgb, var(--bg-surface) 96%, transparent);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 20px 60px rgba(0, 0, 0, 0.1);
    }
    /* Frost / noise between scrim and links (was z-index:-1 and could sit wrong vs. backdrop). */
    .site-nav::before {
        content: '';
        position: absolute; inset: 0;
        background: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
        opacity: 0.06;
        pointer-events: none;
        z-index: 0;
    }
    [data-theme="light"] .site-nav::before {
        opacity: 0.08;
        filter: invert(1);
    }
    .site-nav.open { transform: translateX(0); }
    
    .site-nav > * {
        position: relative;
        z-index: 1;
        opacity: 0;
        transform: translateY(10px);
        transition: opacity var(--duration-normal) ease, transform var(--duration-normal) ease, color var(--duration-fast), background-color var(--duration-fast);
    }
    .site-nav.open > * {
        opacity: 1;
        transform: translateY(0);
    }
    .site-nav.open > *:nth-child(1) { transition-delay: 100ms; }
    .site-nav.open > *:nth-child(2) { transition-delay: 150ms; }
    .site-nav.open > *:nth-child(3) { transition-delay: 200ms; }
    .site-nav.open > *:nth-child(4) { transition-delay: 250ms; }
    .site-nav.open > *:nth-child(5) { transition-delay: 300ms; }
    .site-nav.open > *:nth-child(6) { transition-delay: 350ms; }

    .site-nav a { font-size: 1.5rem; font-weight: 600; }
}

/* ── Footer ── */
.site-footer {
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-16) 0 var(--space-8);
    background: var(--bg-surface);
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8); margin-bottom: var(--space-12);
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-col h4 { font-family: var(--font-display); font-size: 1.125rem; color: var(--fg-primary); margin-bottom: var(--space-4); }
/* Footer wordmark: larger than body icons, muted to stay secondary to page content */
.footer-brand-mark {
    height: 36px;
    width: auto;
    filter: grayscale(1) opacity(0.7);
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--space-2); }
.footer-col ul a { color: var(--fg-secondary); text-decoration: none; transition: color var(--duration-fast); }
.footer-col ul a:hover { color: var(--accent-primary); }
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: var(--space-8); border-top: 1px solid var(--border-subtle);
    color: var(--fg-tertiary); font-size: 0.875rem; flex-wrap: wrap; gap: var(--space-4);
}

/* ── Reveal Animation ── */
.reveal {
    opacity: 0; transform: translateY(20px);
    animation: revealUp var(--duration-slow) var(--ease-out-expo) forwards;
}
.delay-1 { animation-delay: 100ms; }
.delay-2 { animation-delay: 200ms; }
.delay-3 { animation-delay: 300ms; }
@keyframes revealUp { to { opacity: 1; transform: translateY(0); } }

/* ── Utility ── */
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.sr-only {
    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 content link for accessibility */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10001;
    background: var(--accent-primary);
    color: var(--accent-primary-fg);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-weight: 600;
    text-decoration: none;
    transition: top var(--duration-fast) var(--ease-out-expo);
}
.skip-to-content:focus {
    top: var(--space-4);
    outline: 2px solid var(--fg-primary);
    outline-offset: 2px;
}