/* ============================================
   bability.pro — The Architecture of Chance
   ============================================ */

:root {
    --gaussian-midnight: #1e3754;
    --sigma-slate: #3d5a80;
    --scattered-coral: #e07a5f;
    --parchment-null: #f8f5f0;
    --distribution-cream: #eee8df;
    --quartile-gray: #8a9bae;
    --expected-green: #4a9e7e;
    --bayesian-deep: #0d1b2a;

    --font-display: 'Bebas Neue', sans-serif;
    --font-body: 'Libre Baskerville', serif;
    --font-data: 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--parchment-null);
    color: var(--gaussian-midnight);
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.8;
    overflow-x: hidden;
}

/* ============================================
   Typography
   ============================================ */

h2, h3 {
    font-family: var(--font-display);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.data-text {
    font-family: var(--font-data);
    font-size: 14px;
    color: var(--scattered-coral);
    opacity: 0.85;
}

.body-serif {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.8;
    color: var(--gaussian-midnight);
}

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 1.25rem 2rem;
    background: rgba(248, 245, 240, 0.92);
    backdrop-filter: blur(8px);
}

.nav-wordmark {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gaussian-midnight);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    margin-left: auto;
}

.nav-links a {
    font-family: var(--font-data);
    font-size: 13px;
    color: var(--quartile-gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--scattered-coral);
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gaussian-midnight);
    overflow: hidden;
}

.hero-galton {
    position: absolute;
    inset: 0;
    opacity: 0.2;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-sphere {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #f4a58a, var(--scattered-coral), #c45a3c);
    box-shadow: 0 0 30px rgba(224, 122, 95, 0.6), 0 0 60px rgba(224, 122, 95, 0.3);
    margin: 0 auto 3rem;
    animation: sphereFloat 3s ease-in-out infinite;
}

@keyframes sphereFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(5rem, 12vw, 10rem);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--parchment-null);
    line-height: 0.9;
}

.hero-subtitle {
    font-family: var(--font-data);
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--scattered-coral);
    margin-top: 0.5rem;
}

.hero-tagline {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.1rem;
    color: var(--quartile-gray);
    margin-top: 2rem;
}

.bell-curve-edge {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--parchment-null);
    clip-path: ellipse(55% 100% at 50% 100%);
    z-index: 3;
}

/* ============================================
   Section Headers
   ============================================ */

.section-header {
    text-align: center;
    padding: 4rem 2rem 2rem;
}

.prob-label {
    display: block;
    margin-bottom: 0.5rem;
    font-feature-settings: 'tnum';
}

.section-title {
    font-size: clamp(2rem, 5vw, 4rem);
    color: var(--gaussian-midnight);
}

.obs-counter {
    display: block;
    margin-top: 0.75rem;
    font-feature-settings: 'tnum';
}

/* Section Divider Dots */
.section-divider-dots {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 4px;
    padding: 1.5rem 0 2rem;
    height: 50px;
}

.section-divider-dots::before {
    content: '';
    display: flex;
    gap: 4px;
}

/* ============================================
   Masonry Cards
   ============================================ */

.masonry {
    padding: 0 34px 34px;
    column-gap: 21px;
}

.masonry-2 {
    column-count: 2;
}

.masonry-4 {
    column-count: 4;
}

.card {
    break-inside: avoid;
    background: var(--distribution-cream);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 21px;
    box-shadow: 0 4px 24px rgba(30, 55, 90, 0.12);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.card.visible {
    opacity: 1;
    transform: translateY(0);
}

.card h3 {
    font-size: 1.5rem;
    color: var(--sigma-slate);
    margin-bottom: 0.75rem;
    letter-spacing: 0.08em;
}

.card p {
    margin-bottom: 0.75rem;
}

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

.card-n {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 11px;
    opacity: 0.6;
}

/* ============================================
   Branching Section
   ============================================ */

.branching-section {
    padding-bottom: 4rem;
    background: var(--parchment-null);
    background-image:
        radial-gradient(circle at 20% 30%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 60% 70%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 40% 80%, var(--quartile-gray) 1px, transparent 1px);
    background-size: 200px 200px, 300px 250px, 250px 300px, 350px 200px;
    background-position: 0 0, 50px 30px, 100px 60px, 20px 90px;
}

/* ============================================
   Accumulation Section
   ============================================ */

.accumulation-section {
    padding-bottom: 4rem;
    background: var(--parchment-null);
    background-image:
        radial-gradient(circle at 15% 25%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 35% 45%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 55% 65%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 75% 35%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 45% 85%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 65% 15%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 25% 55%, var(--quartile-gray) 1px, transparent 1px),
        radial-gradient(circle at 85% 75%, var(--quartile-gray) 1px, transparent 1px);
    background-size: 180px 180px, 220px 220px, 160px 160px, 250px 250px, 200px 200px, 280px 280px, 190px 190px, 240px 240px;
}

/* ============================================
   Distribution Section (Bell Curve Floor)
   ============================================ */

.distribution-section {
    background: var(--bayesian-deep);
    padding-bottom: 0;
    position: relative;
    overflow: hidden;
}

.distribution-section .section-title {
    color: var(--parchment-null);
}

.distribution-section .prob-label {
    color: var(--scattered-coral);
}

.bell-curve-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 8px;
    padding: 2rem 34px;
    align-items: flex-end;
    min-height: 50vh;
}

.bell-col {
    height: var(--col-h);
    min-height: 60px;
    background: rgba(61, 90, 128, 0.3);
    border-radius: 8px 8px 0 0;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    transition: height 0.6s ease;
}

.bell-col .data-text {
    text-align: center;
    font-size: 13px;
}

.bell-col .body-serif {
    color: var(--distribution-cream);
    font-size: 14px;
    line-height: 1.6;
}

.bell-col-peak {
    background: rgba(224, 122, 95, 0.2);
    border: 1px solid rgba(224, 122, 95, 0.3);
}

.bell-curve-svg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 200px;
    opacity: 0.25;
    pointer-events: none;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bayesian-deep);
    padding: 4rem 2rem;
    border-top: 1px solid rgba(61, 90, 128, 0.3);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 900px;
    margin: 0 auto;
}

.footer-dice {
    display: flex;
    gap: 12px;
}

.footer-dice svg {
    width: 40px;
    height: 40px;
}

.footer-info {
    text-align: right;
}

.footer-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--parchment-null);
}

.footer-caption {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 14px;
    color: var(--quartile-gray);
    margin-top: 0.25rem;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .masonry-4 {
        column-count: 3;
    }
}

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

    .nav-links {
        margin-left: 0;
        gap: 1rem;
        flex-wrap: wrap;
    }

    .masonry-2,
    .masonry-4 {
        column-count: 1;
    }

    .masonry {
        padding: 0 1rem 1rem;
    }

    .bell-curve-grid {
        grid-template-columns: repeat(5, 1fr);
        padding: 2rem 1rem;
    }

    .bell-col:nth-child(1),
    .bell-col:nth-child(2),
    .bell-col:nth-child(8),
    .bell-col:nth-child(9) {
        display: none;
    }

    .hero-title {
        font-size: clamp(3.5rem, 15vw, 7rem);
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .footer-info {
        text-align: center;
    }

    .section-header {
        padding: 3rem 1rem 1.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-sphere {
        animation: none;
    }

    .card {
        opacity: 1;
        transform: none;
        transition: none;
    }
}