/* ═══════════════════════════════════════════════════════════
   NEURAL NETWORKS MASTERCLASS STYLES
   Inherits Bunkros Global Variables
   ═══════════════════════════════════════════════════════════ */

:root {
    /* Mapping Local Semantics to Global Bunkros Variables */
    --nn-bg: var(--bg-base);
    --nn-surface: var(--bg-surface);
    --nn-elevated: var(--bg-elevated);
    --nn-border: var(--border-color);
    --header-offset: 88px;

    /* Accents */
    --nn-primary: var(--primary-accent);       /* Was Magenta */
    --nn-secondary: var(--secondary-accent);   /* Was Cyan */
    --nn-tertiary: var(--tertiary-accent);     /* Was Infrared */

    /* Text */
    --nn-text: var(--text-primary);
    --nn-text-muted: var(--text-secondary);
    --nn-text-dim: var(--text-tertiary);

    /* Glows (Using global RGB values if available, or fallbacks) */
    --nn-glow-pri: rgba(var(--primary-accent-rgb), 0.4);
    --nn-glow-sec: rgba(var(--secondary-accent-rgb), 0.3);
    --nn-glow-ter: rgba(var(--tertiary-accent-rgb), 0.3);

    /* Typography (Inherit Global) */
    --nn-font-display: var(--font-heading);
    --nn-font-body: var(--font-body);

    /* Animation */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Overrides */
html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    scroll-padding-top: 0 !important;
}

@media (max-width: 768px) {
    :root {
        --header-offset: 76px;
    }
}

/* Layout */
.neural-section {
    min-height: 100dvh;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: calc(var(--header-offset) + 40px);
    padding-bottom: 60px;
    border-bottom: 1px solid var(--nn-border);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

main > section {
    min-height: 100dvh;
    padding-top: calc(var(--header-offset) + 40px);
    padding-bottom: 60px;
    scroll-snap-align: start;
    scroll-snap-stop: always;
}

main > section:last-of-type {
    padding-bottom: calc(var(--mobile-bottom-bar-height) + 40px);
}

/* ═══════════════════════════════════════════════════════════
   HERO SECTION
   ═══════════════════════════════════════════════════════════ */
.hero {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute; inset: 0; z-index: -1;
}

.hero-video {
    position: absolute; inset: 0; width: 100%; height: 100%;
    object-fit: cover; opacity: 0.3;
}

.hero-gradient {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, transparent 0%, var(--nn-bg) 100%);
}

.hero-grid {
    position: absolute; inset: 0;
    background-image: 
        linear-gradient(var(--nn-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--nn-border) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.2;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-content { position: relative; z-index: 1; }

.hero-title {
    font-family: var(--nn-font-display);
    font-size: clamp(3rem, 10vw, 8rem);
    font-weight: 800;
    line-height: 0.9;
    letter-spacing: -0.03em;
    margin-bottom: 2rem;
}

.hero-title .word {
    display: inline-block;
    opacity: 0;
    animation: slideUp 0.8s var(--ease-out-expo) forwards;
}
.hero-title .word:nth-child(2) { animation-delay: 0.1s; }
.hero-title .word:nth-child(3) { animation-delay: 0.2s; color: var(--nn-primary); }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(100%); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--nn-text-muted);
    max-width: 600px;
    margin-bottom: 3rem;
}

/* ═══════════════════════════════════════════════════════════
   UI COMPONENTS
   ═══════════════════════════════════════════════════════════ */
.btn-primary {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 16px 32px; background: var(--nn-primary);
    color: #000; font-family: var(--nn-font-display);
    font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
    text-decoration: none; transition: all 0.3s ease;
    box-shadow: 0 0 20px var(--nn-glow-pri);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 40px var(--nn-glow-pri); }

.section-nav {
    position: fixed; right: 2rem; top: 50%; transform: translateY(-50%);
    z-index: 100; display: flex; flex-direction: column; gap: 1rem;
}

.section-nav-item {
    width: 8px; height: 8px; border: 1px solid var(--nn-text-dim);
    background: transparent; cursor: pointer; transition: all 0.3s ease;
    position: relative;
}
.section-nav-item::before {
    content: attr(data-label); position: absolute;
    right: 20px; top: 50%; transform: translateY(-50%);
    font-size: 0.65rem; text-transform: uppercase; color: var(--nn-text-dim);
    opacity: 0; transition: opacity 0.2s ease; white-space: nowrap;
}
.section-nav-item:hover::before, .section-nav-item.active::before { opacity: 1; }
.section-nav-item.active {
    background: var(--nn-primary); border-color: var(--nn-primary);
    box-shadow: 0 0 10px var(--nn-glow-pri);
}

/* ═══════════════════════════════════════════════════════════
   CARDS & GRIDS
   ═══════════════════════════════════════════════════════════ */
.content-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem; margin-top: 3rem;
}

.content-card {
    background: var(--nn-elevated); border: 1px solid var(--nn-border);
    padding: 2.5rem; position: relative; overflow: hidden;
    transition: all 0.4s ease;
}
.content-card:hover { border-color: var(--nn-primary); transform: translateY(-5px); }

.card-icon {
    font-size: 2rem; margin-bottom: 1.5rem; color: var(--nn-primary);
}

.display-lg { font-family: var(--nn-font-display); font-size: 3rem; font-weight: 700; line-height: 1; margin-bottom: 1rem; }
.display-sm { font-family: var(--nn-font-display); font-size: 1.5rem; font-weight: 600; margin-bottom: 1rem; }
.body-md { color: var(--nn-text-muted); line-height: 1.7; }

.section-number {
    font-family: var(--nn-font-display); font-weight: 700;
    color: var(--nn-primary); margin-bottom: 1rem; display: block;
}

/* ═══════════════════════════════════════════════════════════
   VISUALIZATIONS
   ═══════════════════════════════════════════════════════════ */
.neural-viz {
    display: flex; justify-content: center; align-items: center;
    position: relative; height: 400px; margin: 4rem 0;
}
.neural-layer {
    display: flex; flex-direction: column; gap: 20px;
    align-items: center; margin: 0 40px; position: relative; z-index: 2;
}
.neural-node {
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--nn-surface); border: 2px solid var(--nn-text-dim);
    transition: 0.3s;
}
.neural-node.active {
    background: var(--nn-primary); border-color: var(--nn-primary);
    box-shadow: 0 0 15px var(--nn-glow-pri);
}
.neural-connections {
    position: absolute; inset: 0; z-index: 1;
}
.neural-connections line {
    stroke: var(--nn-border); stroke-width: 1; transition: 0.3s;
}
.neural-connections line.active {
    stroke: var(--nn-primary); opacity: 0.5;
}

/* Training Graphs */
.training-viz { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin: 3rem 0; }
.training-graph {
    background: var(--nn-elevated); border: 1px solid var(--nn-border);
    padding: 2rem; height: 300px; position: relative;
}
.graph-line path {
    stroke-width: 3; fill: none; stroke-dasharray: 1000; stroke-dashoffset: 1000;
    animation: drawLine 3s var(--ease-out-expo) forwards;
}
.loss-curve { stroke: var(--nn-primary); }
.accuracy-curve { stroke: var(--nn-secondary); }

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

/* Unknowns & Risks */
.unknown-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
    background: var(--nn-border); border: 1px solid var(--nn-border);
}
.unknown-item {
    background: var(--nn-bg); padding: 3rem; position: relative;
}
.unknown-item::after {
    content: '?'; position: absolute; right: 1rem; bottom: 0;
    font-family: var(--nn-font-display); font-size: 6rem;
    font-weight: 800; color: var(--nn-elevated); line-height: 1;
}

.risk-matrix { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.risk-item {
    background: var(--nn-elevated); padding: 2rem; border: 1px solid var(--nn-border);
    border-left-width: 4px;
}
.risk-item.high { border-left-color: var(--nn-primary); }
.risk-item.medium { border-left-color: var(--nn-tertiary); }
.risk-item.low { border-left-color: var(--nn-secondary); }

/* Footer override for this specific page layout */
.neural-footer {
    border-top: 1px solid var(--nn-border);
    margin-top: 4rem; padding: 4rem 0;
}

/* Loading Screen */
.loader {
    position: fixed; inset: 0; background: var(--nn-bg); z-index: 9999;
    display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 2rem;
    transition: opacity 0.6s ease;
}
.loader.hidden { opacity: 0; pointer-events: none; }
.loader-bar {
    width: 200px; height: 2px; background: var(--nn-border); position: relative;
    overflow: hidden;
}
.loader-bar::after {
    content: ''; position: absolute; left: 0; top: 0; height: 100%; width: 0%;
    background: var(--nn-primary); animation: loading 2s ease forwards;
}
@keyframes loading { to { width: 100%; } }

/* Reveal Animation */
.reveal {
    opacity: 0; transform: translateY(40px);
    transition: all 0.8s var(--ease-out-expo);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Ambient Orbs */
.glow-orb {
    position: fixed; width: 600px; height: 600px; border-radius: 50%;
    pointer-events: none; z-index: -1; filter: blur(120px); opacity: 0.15;
}
.glow-orb.primary { background: var(--nn-primary); top: 10%; left: -200px; }
.glow-orb.secondary { background: var(--nn-secondary); bottom: 20%; right: -200px; }

@media (max-width: 768px) {
    .section-nav { display: none; }
    .hero-title { font-size: 3.5rem; }
    .training-viz, .unknown-grid, .risk-matrix { grid-template-columns: 1fr; }
}