/* ============================================================
   Artificial Cerebrum — Shared Design System
   Import this before any page-specific stylesheet.
   Provides: fonts, CSS variables, glassmorphism utilities,
   typography base, shared navbar/footer overrides.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

/* ── Design tokens ─────────────────────────────────────────── */
:root {
    /* Background */
    --ac-bg:             #060810;
    --ac-bg-secondary:   #0a0d1a;
    --ac-bg-card:        rgba(255, 255, 255, 0.03);

    /* Teal palette */
    --ac-teal:           #00d4ff;
    --ac-teal-dim:       #0099bb;
    --ac-teal-glow:      rgba(0, 212, 255, 0.25);
    --ac-teal-border:    rgba(0, 212, 255, 0.18);

    /* Gold palette */
    --ac-gold:           #d4af37;
    --ac-gold-dim:       #a8892a;
    --ac-gold-glow:      rgba(212, 175, 55, 0.25);
    --ac-gold-border:    rgba(212, 175, 55, 0.18);

    /* Text */
    --ac-text:           #e8f4f8;
    --ac-text-muted:     #6a8fa8;
    --ac-text-faint:     #3a5a6e;

    /* Glass surfaces */
    --ac-glass-bg:       rgba(6, 14, 30, 0.65);
    --ac-glass-border:   rgba(0, 212, 255, 0.12);
    --ac-glass-border-hover: rgba(0, 212, 255, 0.4);
    --ac-blur:           blur(20px);

    /* Shadows & glows */
    --ac-shadow:         0 8px 40px rgba(0, 0, 0, 0.55);
    --ac-glow-teal:      0 0 24px rgba(0, 212, 255, 0.35), 0 0 80px rgba(0, 212, 255, 0.1);
    --ac-glow-gold:      0 0 24px rgba(212, 175, 55, 0.35), 0 0 80px rgba(212, 175, 55, 0.1);
    --ac-glow-soft:      0 4px 24px rgba(0, 212, 255, 0.15);

    /* Geometry */
    --ac-radius:         12px;
    --ac-radius-lg:      20px;
    --ac-radius-xl:      28px;

    /* Typography */
    --font-display:      'Orbitron', 'Segoe UI', monospace;
    --font-body:         'Rajdhani', 'Segoe UI', sans-serif;
}

/* ── Base reset ─────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    overflow-x: hidden;
}

body {
    background-color: var(--ac-bg);
    color: var(--ac-text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    letter-spacing: 0.02em;
}

/* ── Typography utilities ───────────────────────────────────── */
h1, h2, h3,
.logo,
.ac-display {
    font-family: var(--font-display);
    letter-spacing: 0.06em;
    line-height: 1.2;
}

h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }

/* ── Glassmorphism panel ────────────────────────────────────── */
.glass {
    background: var(--ac-glass-bg);
    backdrop-filter: var(--ac-blur);
    -webkit-backdrop-filter: var(--ac-blur);
    border: 1px solid var(--ac-glass-border);
    border-radius: var(--ac-radius-lg);
    box-shadow: var(--ac-shadow);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.glass:hover {
    border-color: var(--ac-glass-border-hover);
    box-shadow: var(--ac-shadow), var(--ac-glow-soft);
}

/* ── Button base ────────────────────────────────────────────── */
.btn-ac {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0.75rem 1.75rem;
    border-radius: var(--ac-radius);
    border: 1px solid var(--ac-teal-border);
    background: var(--ac-glass-bg);
    color: var(--ac-teal);
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn-ac:hover {
    background: rgba(0, 212, 255, 0.12);
    border-color: var(--ac-teal);
    color: #fff;
    box-shadow: var(--ac-glow-teal);
    transform: translateY(-2px);
}

.btn-ac-gold {
    border-color: var(--ac-gold-border);
    color: var(--ac-gold);
}

.btn-ac-gold:hover {
    background: rgba(212, 175, 55, 0.12);
    border-color: var(--ac-gold);
    color: #fff;
    box-shadow: var(--ac-glow-gold);
}

/* ── Glow text ──────────────────────────────────────────────── */
.glow-teal {
    color: var(--ac-teal);
    text-shadow: 0 0 20px var(--ac-teal-glow), 0 0 60px rgba(0, 212, 255, 0.1);
}

.glow-gold {
    color: var(--ac-gold);
    text-shadow: 0 0 20px var(--ac-gold-glow), 0 0 60px rgba(212, 175, 55, 0.1);
}

/* ── Neural canvas (added by neuralCanvas.js) ───────────────── */
#neural-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 0.45;
}

/* All content must be above canvas */
body > *:not(#neural-canvas) {
    position: relative;
    z-index: 1;
}

/* ── Shared navbar overrides ────────────────────────────────── */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    font-family: var(--font-display);
    letter-spacing: 0.05em;
    background: var(--ac-glass-bg) !important;
    backdrop-filter: var(--ac-blur);
    -webkit-backdrop-filter: var(--ac-blur);
    border-bottom: 1px solid var(--ac-glass-border) !important;
}

.logo {
    color: var(--ac-teal) !important;
    text-shadow: 0 0 15px var(--ac-teal-glow);
    font-size: 1.1rem !important;
    letter-spacing: 0.1em;
    flex-shrink: 0; /* prevent logo from collapsing into nav links */
    white-space: nowrap;
}

.nav-links li a {
    font-family: var(--font-body) !important;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ac-text-muted) !important;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.nav-links li a:hover {
    color: var(--ac-teal) !important;
    text-shadow: 0 0 12px var(--ac-teal-glow);
}

/* ── Shared footer overrides ────────────────────────────────── */
.footer {
    background: var(--ac-glass-bg) !important;
    backdrop-filter: var(--ac-blur);
    border-top: 1px solid var(--ac-glass-border) !important;
    font-family: var(--font-body);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: var(--ac-text-muted) !important;
    padding: 1.5rem !important;
    text-align: center;
    /* Fix: center content on ultrawide screens */
    width: 100%;
    box-sizing: border-box;
}

/* Center the inner container on any screen width */
.footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer a {
    color: var(--ac-teal) !important;
    text-decoration: none;
    transition: color 0.2s, text-shadow 0.2s;
}

.footer a:hover {
    color: var(--ac-gold) !important;
    text-shadow: 0 0 10px var(--ac-gold-glow);
}

/* ── Divider ─────────────────────────────────────────────────── */
.section-divider {
    height: 1px !important;
    background: linear-gradient(90deg,
        transparent,
        var(--ac-teal-border) 20%,
        var(--ac-teal) 50%,
        var(--ac-teal-border) 80%,
        transparent
    ) !important;
    box-shadow: 0 0 12px var(--ac-teal-glow) !important;
    max-width: 600px !important;
    margin: 2rem auto !important;
    border-radius: 999px;
    filter: none !important;
}

.section-divider::after {
    display: none !important;
}

/* ── Scrollbar ───────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--ac-bg); }
::-webkit-scrollbar-thumb {
    background: var(--ac-teal-border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--ac-teal-dim);
}

/* ── Selection ───────────────────────────────────────────────── */
::selection {
    background: rgba(0, 212, 255, 0.25);
    color: #fff;
}