/* ═══════════════════════════════════════════════════════════════════════════════
   Leonardo's Design System — Authentic Codex Aesthetic
   Inspired by the manuscripts of Leonardo da Vinci (1452-1519)
   ═══════════════════════════════════════════════════════════════════════════════ */

/* ───────────────────────────────────────────────────────────────────────────────
   CSS Custom Properties — The Master's Palette
   Colors derived from actual Renaissance manuscripts and pigments
   ─────────────────────────────────────────────────────────────────────────────── */
:root {
    /* Inks — Walnut gall, carbon, and iron-based */
    --ink-walnut: #2d1f16;
    --ink-walnut-light: #4a3d32;
    --ink-faded: #6b5d52;
    --ink-carbon: #1a1510;
    
    /* Parchment — Vellum and aged paper tones */
    --parchment: #f8f3e8;
    --parchment-warm: #f5ecd8;
    --parchment-aged: #ebe0c8;
    --parchment-dark: #d9cbb0;
    --vellum: #faf6ed;
    
    /* Pigments — Period-accurate colors */
    --vermillion: #c73e1d;
    --vermillion-dark: #9a2e14;
    --ochre: #cca43b;
    --ochre-dark: #9a7b2c;
    --umber: #5c4033;
    --umber-light: #8b6914;
    --indigo: #2c3e50;
    --terre-verte: #5f7a6a;
    --lead-tin-yellow: #e8d440;
    
    /* Gold — Tarnished leaf and highlights */
    --gold: #c9a227;
    --gold-pale: #d4af37;
    --gold-dark: #9a7b2c;
    --bronze: #8b7355;
    
    /* Renaissance Typography */
    --font-display: 'Cinzel', 'Trajan Pro', 'Times New Roman', serif;
    --font-body: 'Cormorant Garamond', 'Garamond', 'EB Garamond', Georgia, serif;
    --font-notes: 'Crimson Pro', 'Times New Roman', serif;
    --font-mirror: 'Cinzel', serif;
    
    /* Spacing — Golden Ratio approximations */
    --space-xs: 0.382rem;
    --space-sm: 0.618rem;
    --space-md: 1rem;
    --space-lg: 1.618rem;
    --space-xl: 2.618rem;
    --space-xxl: 4.236rem;
    
    /* Transitions */
    --transition-swift: 0.2s ease;
    --transition-measured: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows — Subtle, like ink wash */
    --shadow-soft: 0 1px 3px rgba(45, 31, 22, 0.08);
    --shadow-medium: 0 3px 8px rgba(45, 31, 22, 0.12);
    --shadow-deep: 0 8px 24px rgba(45, 31, 22, 0.15);
    
    /* Borders */
    --border-hairline: 1px solid rgba(45, 31, 22, 0.12);
    --border-medium: 1px solid rgba(45, 31, 22, 0.2);
    --border-gold: 1px solid var(--gold);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Base Reset
   ─────────────────────────────────────────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.7;
    color: var(--ink-walnut);
    background: var(--parchment);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Parchment Textures & Aging Simulation
   ─────────────────────────────────────────────────────────────────────────────── */
.parchment-bg {
    background: 
        linear-gradient(180deg, 
            var(--vellum) 0%, 
            var(--parchment) 50%,
            var(--parchment-warm) 100%);
    position: relative;
    overflow: hidden;
}

.parchment-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='parchment'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.04' numOctaves='5' stitchTiles='stitch'/%3E%3CfeDiffuseLighting lighting-color='%23f8f3e8' surfaceScale='2' result='noise'%3E%3CfeDistantLight azimuth='45' elevation='60'/%3E%3C/feDiffuseLighting%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23parchment)' opacity='0.4'/%3E%3C/svg%3E");
    opacity: 0.6;
    pointer-events: none;
    mix-blend-mode: multiply;
    z-index: 0;
}

/* Wormholes - Random small holes in the vellum */
.manuscript-aging {
    position: fixed; /* Fixed to follow scroll and create depth */
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.4;
    will-change: transform;
}

.wormholes {
    position: absolute;
    inset: -50px;
    background-image: radial-gradient(circle at 10% 20%, rgba(0,0,0,0.15) 1px, transparent 1px),
                      radial-gradient(circle at 85% 15%, rgba(0,0,0,0.1) 1.5px, transparent 1.5px),
                      radial-gradient(circle at 45% 75%, rgba(0,0,0,0.12) 1.2px, transparent 1.2px),
                      radial-gradient(circle at 92% 88%, rgba(0,0,0,0.08) 2px, transparent 2px);
    background-size: 300px 400px;
    transform: translateZ(0);
}

/* Water Stains - Large organic tea-colored blotches */
.water-stains {
    position: absolute;
    inset: -100px;
    background: 
        radial-gradient(ellipse at 15% 10%, rgba(139, 105, 20, 0.05) 0%, transparent 40%),
        radial-gradient(ellipse at 85% 85%, rgba(139, 105, 20, 0.04) 0%, transparent 35%),
        radial-gradient(ellipse at 50% 50%, rgba(139, 105, 20, 0.02) 0%, transparent 60%);
    filter: blur(20px);
    transform: translateZ(0) scale(1.1);
}

/* Ink Bleed - Subtle halo around text blocks */
.ink-bleed-container {
    position: relative;
    z-index: 2;
}

.ink-bleed-container::after {
    content: '';
    position: absolute;
    inset: -10px;
    background: radial-gradient(circle at center, rgba(45, 31, 22, 0.015) 0%, transparent 80%);
    pointer-events: none;
    mix-blend-mode: multiply;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Typography — Display & Headings
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--parchment);
    text-align: center;
    line-height: 1.3;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.codex-subtitle {
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: var(--space-lg);
}

.codex-section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-walnut);
    text-align: center;
    margin-bottom: var(--space-sm);
}

.codex-section-subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--ink-faded);
    text-align: center;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Body Text Styles
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-body {
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--ink-walnut);
}

.codex-body-emphasis {
    font-family: var(--font-body);
    font-style: italic;
    font-weight: 500;
    color: var(--ink-walnut);
}

.codex-marginalia {
    font-family: var(--font-notes);
    font-size: 0.85rem;
    font-style: italic;
    color: var(--ink-faded);
    border-left: 2px solid var(--gold);
    padding-left: var(--space-sm);
    opacity: 0.9;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Mirror Writing — Leonardo's Signature Style
   ─────────────────────────────────────────────────────────────────────────────── */
.mirror-script {
    font-family: var(--font-mirror);
    letter-spacing: 0.08em;
    transform: scaleX(-1);
    direction: rtl;
    unicode-bidi: bidi-override;
    opacity: 0.75;
    transition: all 0.8s cubic-bezier(0.19, 1, 0.22, 1);
    cursor: help;
    display: inline-block;
    position: relative;
}

.mirror-script:hover {
    opacity: 1;
    transform: scaleX(1);
    color: var(--vermillion);
    text-shadow: 0 0 15px rgba(199, 62, 29, 0.2);
}

.mirror-script::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--vermillion);
    transition: width 0.6s ease;
}

.mirror-script:hover::after {
    width: 100%;
}

/* Red chalk annotations - The "Marginalia of Genius" */
.red-chalk-layer {
    position: absolute;
    pointer-events: none;
    font-family: var(--font-notes);
    color: var(--vermillion);
    opacity: 0.8;
    line-height: 1.2;
    z-index: 5;
    filter: drop-shadow(1px 1px 0px rgba(45, 31, 22, 0.1));
}

.annotation-sketch {
    position: absolute;
    stroke: var(--vermillion);
    stroke-width: 0.8;
    fill: none;
    opacity: 0.6;
    transition: opacity 1s ease;
}

.sketch-visible {
    opacity: 1;
    animation: handDrawn 2s ease-out forwards;
}

@keyframes handDrawn {
    from { stroke-dashoffset: 500; }
    to { stroke-dashoffset: 0; }
}

@keyframes jitter {
    0% { transform: translate(0,0); }
    25% { transform: translate(0.5px, -0.5px); }
    50% { transform: translate(-0.5px, 0.5px); }
    75% { transform: translate(0.5px, 0.5px); }
    100% { transform: translate(0,0); }
}

.living-sketch {
    animation: jitter 5s infinite;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Decorative Elements
   ─────────────────────────────────────────────────────────────────────────────── */

/* Flourish Divider */
.flourish-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
    position: relative;
}

.flourish-divider::before,
.flourish-divider::after {
    content: '';
    flex: 1;
    max-width: 120px;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--gold) 30%,
        var(--gold) 70%,
        transparent 100%);
}

.flourish-divider .flourish-symbol {
    width: 24px;
    height: 24px;
    color: var(--gold);
}

/* Classical Ornament */
.ornament {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-lg);
    opacity: 0.7;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Illuminated Initial (Drop Cap)
   ─────────────────────────────────────────────────────────────────────────────── */
.illuminated-capital {
    float: left;
    font-family: var(--font-display);
    font-size: 4rem;
    line-height: 0.85;
    padding: 0.1em 0.15em;
    margin: 0.05em 0.1em 0 0;
    color: var(--vermillion);
    border: 2px solid var(--gold);
    background: 
        linear-gradient(135deg, 
            rgba(201, 162, 39, 0.15) 0%, 
            rgba(248, 243, 232, 0.5) 50%,
            rgba(201, 162, 39, 0.1) 100%);
    box-shadow: inset 0 0 20px rgba(201, 162, 39, 0.1);
}

.illuminated-capital.decorated {
    position: relative;
}

.illuminated-capital.decorated::after {
    content: '';
    position: absolute;
    inset: -4px;
    border: 1px solid var(--gold);
    opacity: 0.5;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Cards — Manuscript Style
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-card {
    background: rgba(255, 255, 255, 0.5);
    border: var(--border-hairline);
    padding: var(--space-lg);
    transition: all var(--transition-measured);
    position: relative;
}

.codex-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        transparent 0%,
        var(--gold) 20%,
        var(--gold) 80%,
        transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-swift);
}

.codex-card:hover {
    box-shadow: var(--shadow-medium);
    border-color: rgba(201, 162, 39, 0.3);
    transform: translateY(-3px);
}

.codex-card:hover::before {
    opacity: 1;
}

.codex-card.featured {
    border-color: var(--gold);
    background: rgba(255, 255, 255, 0.7);
}

.codex-card.featured::before {
    opacity: 1;
}

.codex-card h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--ink-walnut);
    margin-bottom: var(--space-sm);
}

.codex-card p {
    font-size: 0.95rem;
    color: var(--ink-faded);
    line-height: 1.6;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Buttons — Classical Style
   ─────────────────────────────────────────────────────────────────────────────── */
.btn-codex {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.875rem 2rem;
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-decoration: none;
    border: 1.5px solid;
    transition: all var(--transition-swift);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-codex-primary {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--ink-walnut);
}

.btn-codex-primary:hover {
    background: var(--gold-pale);
    border-color: var(--gold-pale);
    box-shadow: 0 4px 12px rgba(201, 162, 39, 0.3);
}

.btn-codex-secondary {
    background: transparent;
    border-color: rgba(245, 240, 225, 0.4);
    color: var(--parchment);
}

.btn-codex-secondary:hover {
    border-color: var(--parchment);
    background: rgba(245, 240, 225, 0.08);
}

.btn-codex-outline {
    background: transparent;
    border-color: var(--ink-walnut);
    color: var(--ink-walnut);
}

.btn-codex-outline:hover {
    background: var(--ink-walnut);
    color: var(--parchment);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Badges & Status
   ─────────────────────────────────────────────────────────────────────────────── */
.badge-codex {
    display: inline-block;
    font-family: var(--font-notes);
    font-size: 0.6rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.2rem 0.5rem;
    border: 1px solid;
    vertical-align: middle;
}

.badge-new {
    color: var(--vermillion);
    border-color: var(--vermillion);
}

.badge-validated {
    color: var(--umber-light);
    border-color: var(--umber-light);
    background: rgba(139, 105, 20, 0.06);
}

.badge-progress {
    color: var(--ochre-dark);
    border-color: var(--ochre-dark);
    background: rgba(204, 164, 59, 0.06);
}

.badge-prototype {
    color: var(--indigo);
    border-color: var(--indigo);
    background: rgba(44, 62, 80, 0.06);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Quote Block — Classical Style
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-quote {
    margin: var(--space-xl) 0;
    padding: var(--space-lg) var(--space-xl);
    border-left: 3px solid var(--gold);
    background: rgba(201, 162, 39, 0.05);
    position: relative;
}

.codex-quote::before {
    content: '"';
    position: absolute;
    top: -0.2em;
    left: 0.3em;
    font-family: var(--font-display);
    font-size: 4rem;
    color: var(--gold);
    opacity: 0.3;
    line-height: 1;
}

.codex-quote p {
    font-family: var(--font-body);
    font-size: 1.35rem;
    font-style: italic;
    line-height: 1.6;
    color: var(--ink-walnut);
    margin-bottom: var(--space-sm);
    position: relative;
    z-index: 1;
}

.codex-quote cite {
    font-family: var(--font-notes);
    font-size: 0.9rem;
    font-style: normal;
    color: var(--ink-faded);
    letter-spacing: 0.03em;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Grids & Layouts — The Golden Proportion (φ)
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-grid {
    display: grid;
    gap: var(--space-lg);
}

.codex-grid-golden {
    display: grid;
    grid-template-columns: 1.618fr 1fr;
    gap: var(--space-xl);
}

.codex-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* Invention Card Ghost Sketches */
.invention-card-ghost {
    position: relative;
    overflow: hidden;
}

.invention-card-ghost::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M10,100 Q50,20 190,100' stroke='rgba(199, 62, 29, 0.05)' stroke-width='0.5' fill='none' /%3E%3Ccircle cx='100' cy='100' r='80' stroke='rgba(201, 162, 39, 0.03)' stroke-width='0.3' fill='none' /%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 150%;
    opacity: 0;
    transition: opacity 1s ease;
    pointer-events: none;
    z-index: 0;
}

.invention-card-ghost:hover::after {
    opacity: 1;
    animation: jitter 10s infinite;
}

.card-body {
    position: relative;
    z-index: 1;
}
/* ───────────────────────────────────────────────────────────────────────────────
   Section Styling
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-section {
    padding: var(--space-xxl) var(--space-lg);
    position: relative;
}

.codex-section-inner {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.codex-section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Hero Section — Dark
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-xxl) var(--space-lg);
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(139, 105, 20, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(201, 162, 39, 0.1) 0%, transparent 40%),
        linear-gradient(180deg, 
            var(--ink-carbon) 0%, 
            #1f1610 30%,
            #2d1f16 70%,
            var(--ink-walnut) 100%);
    color: var(--parchment);
    position: relative;
    overflow: hidden;
}

.codex-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E"),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 1000 1000' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M100,100 Q300,50 500,100 T900,100' stroke='rgba(201,162,39,0.03)' stroke-width='0.5' fill='none'/%3E%3Ccircle cx='800' cy='200' r='100' stroke='rgba(201,162,39,0.02)' stroke-width='0.5' fill='none'/%3E%3Crect x='50' y='600' width='200' height='200' stroke='rgba(201,162,39,0.02)' stroke-width='0.5' fill='none' transform='rotate(15, 150, 700)'/%3E%3C/svg%3E");
    pointer-events: none;
}

.codex-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, var(--parchment) 0%, transparent 100%);
}

.codex-hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.codex-hero-description {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    opacity: 0.9;
    line-height: 1.7;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Technical Drawing Elements
   ─────────────────────────────────────────────────────────────────────────────── */
.tech-grid {
    background-image: 
        linear-gradient(rgba(201, 162, 39, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(201, 162, 39, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

.dimension-line {
    position: relative;
    height: 1px;
    background: var(--ink-faded);
}

.dimension-line::before,
.dimension-line::after {
    content: '';
    position: absolute;
    top: -3px;
    width: 0;
    height: 0;
    border-style: solid;
}

.dimension-line::before {
    left: 0;
    border-width: 4px 6px 4px 0;
    border-color: transparent var(--ink-faded) transparent transparent;
}

.dimension-line::after {
    right: 0;
    border-width: 4px 0 4px 6px;
    border-color: transparent transparent transparent var(--ink-faded);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Navigation
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

.codex-nav a {
    font-family: var(--font-display);
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--parchment);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid rgba(245, 240, 225, 0.25);
    transition: all var(--transition-swift);
}

.codex-nav a:hover {
    border-color: var(--gold);
    color: var(--gold);
    background: rgba(201, 162, 39, 0.08);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Footer
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-footer {
    background: var(--ink-walnut);
    color: var(--parchment);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
}

.codex-footer a {
    color: var(--gold);
    text-decoration: none;
    transition: opacity var(--transition-swift);
}

.codex-footer a:hover {
    opacity: 0.7;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Link Styling
   ─────────────────────────────────────────────────────────────────────────────── */
.codex-link {
    font-family: var(--font-display);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--umber);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: all var(--transition-swift);
}

.codex-link:hover {
    color: var(--vermillion);
    gap: 0.6rem;
}

.codex-link::after {
    content: '→';
    transition: transform var(--transition-swift);
}

.codex-link:hover::after {
    transform: translateX(3px);
}

/* ───────────────────────────────────────────────────────────────────────────────
   Utility Classes
   ─────────────────────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

/* ───────────────────────────────────────────────────────────────────────────────
   Responsive Adjustments
   ─────────────────────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    :root {
        --space-lg: 1.25rem;
        --space-xl: 2rem;
        --space-xxl: 3rem;
    }
    
    .codex-title {
        font-size: 1.75rem;
        letter-spacing: 0.08em;
    }
    
    .codex-grid-2,
    .codex-grid-3,
    .codex-grid-4 {
        grid-template-columns: 1fr;
    }
    
    .codex-hero-description {
        font-size: 1.1rem;
    }
    
    .btn-codex {
        width: 100%;
        justify-content: center;
    }
    
    .illuminated-capital {
        font-size: 3rem;
    }
    
    .codex-quote p {
        font-size: 1.15rem;
    }
}

/* ───────────────────────────────────────────────────────────────────────────────
   Print Styles
   ─────────────────────────────────────────────────────────────────────────────── */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .codex-card {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
    
    .btn-codex {
        display: none;
    }
}

/* ───────────────────────────────────────────────────────────────────────────────
   Animation Keyframes
   ─────────────────────────────────────────────────────────────────────────────── */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes drawLine {
    from { stroke-dashoffset: 1000; }
    to { stroke-dashoffset: 0; }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

.animate-draw {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 2s ease-out forwards;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Special Effects — Ink Bleed, Paper Aging
   ─────────────────────────────────────────────────────────────────────────────── */
.ink-bleed {
    position: relative;
}

.ink-bleed::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: radial-gradient(ellipse at center, 
        rgba(45, 31, 22, 0.03) 0%, 
        transparent 70%);
    pointer-events: none;
}

.paper-stain {
    position: relative;
}

.paper-stain::before {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(ellipse at center,
        rgba(139, 105, 20, 0.08) 0%,
        rgba(139, 105, 20, 0.03) 40%,
        transparent 70%);
    pointer-events: none;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Codex Page Numbers & Marginalia Markers
   ─────────────────────────────────────────────────────────────────────────────── */
.folio-number {
    font-family: var(--font-notes);
    font-size: 0.8rem;
    color: var(--ink-faded);
    position: absolute;
    bottom: var(--space-md);
    opacity: 0.6;
    transition: all var(--transition-measured);
}

.folio-marker {
    font-family: var(--font-notes);
    font-size: 0.75rem;
    color: var(--ink-faded);
    opacity: 0.5;
    transition: all var(--transition-measured);
    cursor: pointer;
    border-bottom: 1px dashed transparent;
}

.folio-marker:hover {
    opacity: 1;
    color: var(--vermillion);
    border-color: var(--vermillion);
}

/* Page Curl Effect - Subtle corner shadow to suggest depth */
.page-curl {
    position: relative;
}

.page-curl::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 40px 40px;
    border-color: transparent transparent var(--parchment-dark) transparent;
    box-shadow: -5px -5px 15px rgba(45, 31, 22, 0.1);
    transition: all 0.5s ease;
    opacity: 0.3;
}

.page-curl:hover::after {
    border-width: 0 0 60px 60px;
    opacity: 0.6;
}

/* ───────────────────────────────────────────────────────────────────────────────
   Codex Anima Refinements
   ─────────────────────────────────────────────────────────────────────────────── */
.aerial-recede {
    filter: blur(var(--recede-blur, 0px)) grayscale(var(--recede-gray, 0));
    opacity: var(--recede-opacity, 1);
    transition: all var(--transition-measured);
}

.multispectral-active .codex-title {
    color: var(--vermillion);
    text-shadow: 0 0 20px rgba(199, 62, 29, 0.4);
}

.multispectral-active .codex-hero {
    background: radial-gradient(circle at center, #1a1510 0%, #000 100%);
}

/* Scroll-based aerial perspective */
[data-recede="true"] {
    --recede-blur: 2px;
    --recede-gray: 0.5;
    --recede-opacity: 0.6;
}