/* =========================================
   REASON FIELD - CORE DESIGN SYSTEM
   ========================================= */

:root {
    --bg-core: #020203; /* Deepest abyss black */
    --bg: var(--bg-core);
    --text-prime: #f4f4f5;
    --text: var(--text-prime);
    --text-mute: rgba(255, 255, 255, 0.55);
    --text-dim: var(--text-mute);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --grid-line: var(--border-subtle);
    --border-glow: rgba(255, 255, 255, 0.2);
    --accent: #ffffff;
}

/* Base Reset & Accessibility */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
*:focus-visible { outline: 1px solid var(--accent); outline-offset: 6px; }

body {
    background-color: var(--bg-core);
    color: var(--text-prime);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* The tactile, physical media noise layer */
    background-image:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.055), transparent 30%),
        radial-gradient(circle at 85% 10%, rgba(255, 255, 255, 0.035), transparent 24%),
        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='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
}

/* CSS-Native Ambient Field (Replaces the heavy JS Canvas) */
.ambient-field {
    position: fixed;
    top: -50vh; left: -50vw; 
    width: 200vw; height: 200vh;
    /* Creates a massive, subtle volumetric lighting effect */
    background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 40%),
                conic-gradient(from 90deg at 50% 50%, transparent 0deg, rgba(255, 255, 255, 0.01) 90deg, transparent 180deg, rgba(255, 255, 255, 0.01) 270deg, transparent 360deg);
    z-index: -1;
    pointer-events: none;
    opacity: 0.9;
}

@media (prefers-reduced-motion: no-preference) {
    .ambient-field { animation: slowRotate 120s linear infinite; }
}
@keyframes slowRotate { 100% { transform: rotate(360deg); } }

/* Global Navigation - Floating Glass Effect */
header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem 4vw;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(2, 2, 3, 0.96) 0%, rgba(2, 2, 3, 0.82) 65%, transparent 100%);
    backdrop-filter: blur(8px); /* Frosted glass over the ambient field */
}

.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    font-size: 1.1rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-prime);
    text-decoration: none;
}

nav ul { display: flex; gap: 3rem; list-style: none; flex-wrap: wrap; justify-content: flex-end; }
nav a {
    color: var(--text-mute);
    text-decoration: none;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.3s ease;
}
nav a:hover,
nav a:focus-visible,
nav a.active,
nav a[aria-current="page"] {
    color: var(--text-prime);
}

/* Layout Structure */
main {
    flex: 1;
    padding: 12vh 4vw 4vw 4vw; /* Space for fixed header */
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 10;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute; top: -100px; left: 20px; 
    background: var(--text-prime); color: var(--bg-core); 
    padding: 12px 24px; z-index: 1000; text-decoration: none; 
    font-family: 'Space Grotesk'; font-weight: 500; transition: top 0.3s;
}
.skip-link:focus { top: 20px; }

/* Reusable Content System */
.section-shell {
    margin-top: clamp(3rem, 6vw, 6rem);
    position: relative;
}

.section-shell::before {
    content: "";
    position: absolute;
    top: -1.5rem;
    left: 0;
    width: 5rem;
    height: 1px;
    background: linear-gradient(90deg, var(--border-glow), transparent);
}

.section-label {
    display: inline-block;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--text-mute);
    margin-bottom: 1rem;
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(1.8rem, 3vw, 3rem);
    line-height: 1.05;
    font-weight: 400;
    letter-spacing: -0.03em;
}

.lead-copy {
    max-width: 68ch;
    font-size: 1.05rem;
    color: var(--text-mute);
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2rem;
}

.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.9rem 1.2rem;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    color: var(--text-prime);
    text-decoration: none;
    background: rgba(255, 255, 255, 0.02);
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.button-link:hover,
.button-link:focus-visible {
    transform: translateY(-2px);
    border-color: var(--border-glow);
    background: rgba(255, 255, 255, 0.05);
}

.content-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: clamp(2rem, 4vw, 5rem);
    align-items: start;
}

.stat-grid,
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.stat-card,
.feature-card,
.quote-panel,
.cta-panel,
.process-panel,
.detail-panel {
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.02);
}

.stat-card,
.feature-card,
.detail-panel {
    padding: 1.4rem;
}

.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::after,
.feature-card::after,
.detail-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 42%);
    opacity: 0.45;
    pointer-events: none;
}

.feature-card,
.detail-panel {
    position: relative;
    overflow: hidden;
    border-radius: 1rem;
}

.stat-value {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1;
    margin-bottom: 0.45rem;
}

.stat-label,
.card-note,
.muted-copy {
    color: var(--text-mute);
}

.feature-card h3,
.detail-panel h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
}

.feature-card p,
.detail-panel p,
.quote-panel p,
.process-panel p {
    color: var(--text-mute);
}

.feature-card {
    min-height: 12rem;
    border-top: 1px solid var(--border-subtle);
}

.quote-panel,
.cta-panel,
.process-panel {
    padding: clamp(1.5rem, 3vw, 2.5rem);
}

.quote-panel {
    border-left: 1px solid var(--border-glow);
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.06), transparent), rgba(255, 255, 255, 0.02);
}

.quote-panel::before {
    content: "";
    display: block;
    height: 0.25rem;
    width: 4.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--text-prime), transparent);
}

.process-panel ol,
.process-panel ul {
    margin-top: 1rem;
    padding-left: 1.2rem;
    color: var(--text-mute);
}

.timeline {
    list-style: none;
    display: grid;
    gap: 1rem;
    margin-top: 1.5rem;
}

.timeline li {
    display: grid;
    grid-template-columns: 5rem 1fr;
    gap: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.timeline li strong {
    display: block;
    margin-bottom: 0.35rem;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.timeline .step {
    color: var(--text-mute);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

@media (max-width: 900px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    header {
        align-items: flex-start;
    }

    nav ul {
        justify-content: flex-start;
        gap: 1rem 1.5rem;
    }
}

@media (max-width: 700px) {
    main {
        padding-top: 10rem;
    }

    header {
        padding-top: 1.4rem;
        padding-bottom: 1.4rem;
    }

    .timeline li {
        grid-template-columns: 1fr;
        gap: 0.35rem;
    }
}