/* ============================================================
   pred101 Design System — redesign.css
   Dark Terminal Editorial aesthetic
   Fonts: Instrument Serif · DM Sans · JetBrains Mono
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;600;700&display=swap');

/* ── Design Tokens ────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-deep:     #07090f;
  --bg-base:     #0b1020;
  --bg-surface:  #111827;
  --bg-elevated: #1a2338;
  --bg-glass:    rgba(7, 9, 15, 0.80);

  /* Borders */
  --border:        rgba(148, 163, 184, 0.10);
  --border-strong: rgba(148, 163, 184, 0.22);

  /* Text */
  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  /* Accents */
  --accent-cyan:   #22d3ee;
  --accent-amber:  #fbbf24;
  --accent-violet: #a78bfa;

  /* Semantic */
  --positive: #34d399;
  --negative: #f87171;
  --warning:  #fbbf24;

  /* Glow / Shadow */
  --glow-cyan:   0 0 24px rgba(34, 211, 238, 0.20);
  --glow-amber:  0 0 24px rgba(251, 191, 36, 0.20);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.40);
  --shadow-lg:   0 20px 60px rgba(0, 0, 0, 0.45);

  /* Layout */
  --radius:  16px;
  --radius-sm: 12px;
  --max-w:   1180px;
  --gutter:  24px;

  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(ellipse 60% 40% at 8% 0%, rgba(34, 211, 238, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 35% at 92% 4%, rgba(251, 191, 36, 0.04) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-base) 40%, #090d18 100%);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

/* ── Layout ────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── Typography ────────────────────────────────────────────── */
h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.8rem, 6.5vw, 5.2rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.3rem); font-family: var(--font-body); font-weight: 600; letter-spacing: -0.02em; }

/* ── Header / Nav ──────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.logo .logo-mark { color: var(--accent-cyan); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
  position: relative;
}
.site-nav a:hover,
.site-nav a.active { color: var(--text-primary); }
.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

/* Lang Switch */
.lang-switch {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
  gap: 4px;
  flex-shrink: 0;
}
.lang-switch a {
  padding: 5px 13px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}
.lang-switch a.active {
  background: var(--accent-cyan);
  color: #000;
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  padding: 40px 0 52px;
  color: var(--text-secondary);
  margin-top: 32px;
}
.site-footer .container {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer p { font-size: 0.88rem; }
.site-footer a { color: var(--text-secondary); transition: color 0.15s; }
.site-footer a:hover { color: var(--accent-cyan); }

/* ── Main ───────────────────────────────────────────────────── */
main { padding-top: 64px; }

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 36px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6.5vw, 5.4rem);
  line-height: 1.0;
  letter-spacing: -0.04em;
  font-style: italic;
}

.hero-lead {
  margin-top: 20px;
  max-width: 760px;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── CTA Buttons ───────────────────────────────────────────── */
.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #000;
  border-color: var(--accent-cyan);
}
.btn-primary:hover {
  background: #38e0f5;
  box-shadow: var(--glow-cyan);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  display: block;
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
  transform: translateY(-3px);
}

.card .card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 1.1rem;
}

.card .card-title { font-size: 1.08rem; margin-bottom: 8px; font-family: var(--font-body); font-weight: 600; }
.card .card-desc  { color: var(--text-secondary); font-size: 0.93rem; line-height: 1.6; }
.card .card-tag {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

/* Path cards */
.path-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  display: block;
  min-height: 180px;
}
.path-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
  transform: translateY(-3px);
}
.path-card .step {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-amber);
  margin-bottom: 10px;
}
.path-card .card-title { font-size: 1.05rem; margin-bottom: 6px; font-family: var(--font-body); font-weight: 600; }
.path-card .card-desc  { color: var(--text-secondary); font-size: 0.9rem; }

/* Report cards */
.report-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  display: block;
}
.report-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
  transform: translateY(-3px);
}
.report-card .type {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-amber);
}
.report-card .card-title { font-size: 1.08rem; margin: 8px 0 6px; font-family: var(--font-body); font-weight: 600; }
.report-card .card-desc  { color: var(--text-secondary); font-size: 0.93rem; }

/* Metric cards */
.metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.metric-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
}
.metric-card .value {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
}
.metric-card .label { color: var(--text-secondary); font-size: 0.85rem; margin-top: 4px; }

/* ── Grids ─────────────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

/* ── Section ───────────────────────────────────────────────── */
.section { padding: 28px 0; }

.section-head {
  margin-bottom: 20px;
}
.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.03em;
  font-family: var(--font-display);
}
.section-head p {
  color: var(--text-secondary);
  margin-top: 8px;
  max-width: 640px;
  font-size: 0.98rem;
}

/* ── Notice / Statement ───────────────────────────────────── */
.notice {
  margin-top: 22px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.12);
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ── Badges / Pills ─────────────────────────────────────────── */
.badge {
  display: inline-block;
  margin-top: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.76rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-weight: 600;
}
.badge.live {
  background: rgba(52, 211, 153, 0.10);
  color: var(--positive);
}

.pill {
  display: inline-block;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--accent-cyan);
  font-size: 0.76rem;
  font-weight: 700;
  color: #000;
  font-family: var(--font-mono);
}

/* ── Timeline (learn page) ────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 24px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.day-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.day-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
}
.day-card::before {
  content: '';
  position: absolute;
  left: -21px;
  top: 28px;
  width: 12px;
  height: 12px;
  background: var(--accent-amber);
  border-radius: 50%;
  border: 3px solid var(--bg-base);
  box-shadow: 0 0 8px rgba(251, 191, 36, 0.4);
}

.day-badge {
  display: inline-block;
  background: rgba(34, 211, 238, 0.10);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}
.day-card h2 {
  font-size: 1.35rem;
  margin-bottom: 8px;
  font-family: var(--font-display);
}
.day-card p { color: var(--text-secondary); margin-bottom: 14px; font-size: 0.95rem; }
.day-card ul { padding-left: 20px; color: var(--text-secondary); font-size: 0.93rem; }
.day-card li { margin: 5px 0; }
.day-card .time {
  font-size: 0.83rem;
  color: var(--accent-cyan);
  margin-top: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
}

/* ── Timeline list (reports page) ─────────────────────────── */
.timeline-list {
  display: grid;
  gap: 16px;
}
.tl-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  padding: 18px 22px;
  display: grid;
  grid-template-columns: 130px 1fr auto;
  gap: 18px;
  align-items: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.tl-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card), var(--glow-cyan);
}
.tl-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
}
.tl-title { font-size: 1rem; font-weight: 500; }

/* ── Grid variants ─────────────────────────────────────────── */
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: start;
}

.hero-side {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.hero-side .label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.hero-side .big {
  font-family: var(--font-display);
  font-size: 1.85rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-style: italic;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.statement {
  margin: 24px 0 8px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(251, 191, 36, 0.05);
  border: 1px solid rgba(251, 191, 36, 0.12);
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* ── Animations ─────────────────────────────────────────────── */

/* Page-load entrance */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Scroll-triggered (JS adds .is-visible) */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays */
.delay-1 { transition-delay: 0.08s; }
.delay-2 { transition-delay: 0.16s; }
.delay-3 { transition-delay: 0.24s; }
.delay-4 { transition-delay: 0.32s; }
.delay-5 { transition-delay: 0.40s; }
.delay-6 { transition-delay: 0.48s; }
.delay-7 { transition-delay: 0.56s; }
.delay-8 { transition-delay: 0.64s; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-4    { grid-template-columns: repeat(2, 1fr); }
  .grid-3    { grid-template-columns: repeat(2, 1fr); }
  .tl-item   { grid-template-columns: 1fr auto; }
  .tl-date   { display: none; }
}

@media (max-width: 768px) {
  :root { --gutter: 16px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .mini-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 56px 0 28px; }
  .hero-side .big { font-size: 1.5rem; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 0.88rem; }
}

@media (max-width: 480px) {
  .site-nav { display: none; }
  .hero-title { font-size: 2.4rem; }
}