/* ---- TOKENS ---- */
:root {
  --bg: #0d1117;
  --bg-card: #161b27;
  --bg-card-alt: #1c2233;
  --bg-section: #0f1420;
  --fg: #e8edf5;
  --fg-muted: #8896b0;
  --fg-faint: #4a5568;
  --accent: #00d4aa;
  --accent-dim: rgba(0, 212, 170, 0.12);
  --accent-2: #a78bfa;
  --accent-2-dim: rgba(167, 139, 250, 0.12);
  --amber: #f59e0b;
  --amber-dim: rgba(245, 158, 11, 0.15);
  --border: rgba(255,255,255,0.07);
  --border-light: rgba(255,255,255,0.04);
  --radius: 14px;
  --radius-sm: 8px;
  --radius-xs: 5px;
  --font-display: 'Syne', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  --max-w: 1160px;
  --pad-x: clamp(20px, 5vw, 48px);
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }

/* ---- NAV ---- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 16px var(--pad-x);
  display: flex; align-items: center; gap: 10px;
}
.wordmark {
  font-family: var(--font-display); font-size: 17px; font-weight: 700;
  letter-spacing: -0.3px; color: var(--fg);
}
.wordmark-sm { font-size: 15px; }
.beta-badge {
  font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  background: var(--accent-dim); color: var(--accent); border: 1px solid rgba(0,212,170,0.2);
  padding: 2px 8px; border-radius: 20px;
}

/* ---- HERO ---- */
.hero { padding: 140px var(--pad-x) 80px; }
.hero-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 420px; gap: 80px; align-items: center;
}
.hero-overline {
  font-size: 14px; font-weight: 500; color: var(--accent); letter-spacing: 0.04em;
  margin-bottom: 20px; text-transform: uppercase;
}
.hero-headline {
  font-family: var(--font-display); font-size: clamp(38px, 5vw, 62px);
  font-weight: 800; line-height: 1.08; letter-spacing: -2px; color: var(--fg);
  margin-bottom: 24px;
}
.hero-lede {
  font-size: 18px; color: var(--fg-muted); line-height: 1.65;
  max-width: 480px; margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--accent); color: #0a0f0d; font-weight: 600; font-size: 15px;
  padding: 13px 28px; border-radius: var(--radius); display: inline-block;
  transition: opacity 0.15s, transform 0.15s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-ghost {
  background: var(--bg-card); color: var(--fg-muted); font-weight: 500; font-size: 15px;
  padding: 13px 28px; border-radius: var(--radius); border: 1px solid var(--border);
  display: inline-block; transition: color 0.15s, border-color 0.15s;
}
.btn-ghost:hover { color: var(--fg); border-color: rgba(255,255,255,0.15); }

/* ---- PHONE MOCKUP ---- */
.hero-visual { display: flex; justify-content: center; }
.phone-mockup { perspective: 1000px; }
.phone-frame {
  width: 280px; background: var(--bg-card); border-radius: 40px;
  border: 1px solid var(--border); padding: 16px; box-shadow: 0 40px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.06);
  transform: rotateY(-6deg) rotateX(3deg);
}
.phone-screen { background: var(--bg-section); border-radius: 26px; padding: 18px 16px; }
.app-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.app-title { font-family: var(--font-display); font-size: 15px; font-weight: 700; color: var(--fg); }
.app-badge { font-size: 11px; color: var(--fg-muted); background: var(--bg-card); padding: 2px 8px; border-radius: 20px; }
.cred-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 12px; display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.cred-card-active { border-color: rgba(0,212,170,0.25); background: rgba(0,212,170,0.05); }
.cred-icon { color: var(--fg-muted); display: flex; align-items: center; }
.cred-info { flex: 1; }
.cred-name { font-size: 12px; font-weight: 600; color: var(--fg); }
.cred-exp { font-size: 11px; color: var(--fg-muted); margin-top: 2px; }
.highlight-warn { color: var(--amber); font-weight: 600; }
.cred-status { font-size: 12px; font-weight: 700; }
.cred-status.ok { color: var(--accent); }
.cred-status.warn { color: var(--amber); }
.study-streak {
  background: var(--accent-dim); border: 1px solid rgba(0,212,170,0.2);
  border-radius: var(--radius-xs); padding: 8px 12px; margin-top: 14px;
  display: flex; justify-content: space-between; align-items: center;
}
.streak-label { font-size: 11px; color: var(--fg-muted); }
.streak-num { font-size: 13px; font-weight: 700; color: var(--accent); font-family: var(--font-display); }

/* ---- STATS BAR ---- */
.stats-bar { background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 36px var(--pad-x); }
.stats-inner { max-width: var(--max-w); margin: 0 auto; display: flex; align-items: center; justify-content: center; gap: 0; }
.stat { text-align: center; padding: 0 60px; }
.stat-num { display: block; font-family: var(--font-display); font-size: 30px; font-weight: 800; color: var(--fg); letter-spacing: -1px; }
.stat-label { display: block; font-size: 13px; color: var(--fg-muted); margin-top: 4px; }
.stat-divider { width: 1px; height: 48px; background: var(--border); flex-shrink: 0; }

/* ---- FEATURES ---- */
.features { padding: 100px var(--pad-x); }
.features-header { max-width: var(--max-w); margin: 0 auto 70px; text-align: center; }
.features-header h2 {
  font-family: var(--font-display); font-size: clamp(28px, 4vw, 44px);
  font-weight: 800; letter-spacing: -1.5px; color: var(--fg); margin-bottom: 14px;
}
.features-sub { font-size: 17px; color: var(--fg-muted); }
.feature-grid { max-width: var(--max-w); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.feature-art { padding: 28px; min-height: 240px; display: flex; flex-direction: column; justify-content: center; background: var(--bg-card-alt); border-bottom: 1px solid var(--border); }
.feature-body { padding: 24px 28px 28px; }
.feature-body h3 { font-family: var(--font-display); font-size: 20px; font-weight: 700; color: var(--fg); margin-bottom: 10px; }
.feature-body p { font-size: 14px; color: var(--fg-muted); line-height: 1.7; margin-bottom: 16px; }
.feature-pills { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.feature-pills li {
  font-size: 12px; font-weight: 500; color: var(--accent);
  background: var(--accent-dim); border: 1px solid rgba(0,212,170,0.15);
  padding: 3px 10px; border-radius: 20px;
}

/* Feature illustrations */
.daily-learning-art { align-items: center; }
.card-stack { position: relative; width: 100%; max-width: 240px; }
.study-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; margin-bottom: 10px; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.study-card-top { transform: translateX(-8px); border-left: 3px solid var(--accent); }
.study-card-faded { opacity: 0.4; transform: translateX(8px); }
.sc-tag { font-size: 10px; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 6px; }
.sc-tag-green { color: #4ade80; }
.sc-tag-blue { color: var(--accent-2); }
.sc-q { font-size: 13px; font-weight: 600; color: var(--fg); line-height: 1.4; margin-bottom: 6px; }
.sc-hint { font-size: 11px; color: var(--fg-muted); font-style: italic; }

.community-art { align-items: center; }
.community-rings { position: relative; width: 180px; height: 180px; margin: 0 auto 16px; }
.ring {
  position: absolute; border: 1px solid var(--border); border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  font-size: 11px; font-weight: 600; background: var(--bg-card);
}
.ring-1 { width: 70px; height: 70px; top: 0; left: 50%; transform: translateX(-50%); }
.ring-2 { width: 64px; height: 64px; bottom: 20px; right: 0; }
.ring-3 { width: 60px; height: 60px; bottom: 0; left: 0; }
.ring-4 { width: 56px; height: 56px; top: 20px; right: 10px; }
.ring-icon { font-size: 12px; font-weight: 800; color: var(--accent); font-family: var(--font-display); }
.ring-label { font-size: 9px; color: var(--fg-muted); text-align: center; max-width: 50px; line-height: 1.3; }
.community-center {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 48px; height: 48px; background: var(--accent-dim); border: 1px solid rgba(0,212,170,0.3);
  border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--accent);
}
.anon-toggle { display: flex; align-items: center; gap: 10px; justify-content: center; }
.anon-toggle span { font-size: 12px; color: var(--fg-muted); }
.anon-track { width: 36px; height: 20px; background: var(--accent-dim); border-radius: 10px; position: relative; padding: 3px; }
.anon-thumb { width: 14px; height: 14px; background: var(--accent); border-radius: 50%; }

.wallet-art { justify-content: center; }
.wallet-schematic { width: 100%; max-width: 260px; }
.wallet-item { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--border-light); }
.wallet-item:last-of-type { border-bottom: none; }
.w-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.w-dot-green { background: var(--accent); }
.w-dot-amber { background: var(--amber); }
.w-name { flex: 1; font-size: 13px; font-weight: 500; color: var(--fg); }
.w-exp { font-size: 12px; color: var(--fg-muted); }
.alert-banner {
  background: var(--amber-dim); border: 1px solid rgba(245,158,11,0.25);
  border-radius: var(--radius-xs); padding: 8px 12px; margin-top: 12px;
  font-size: 12px; color: var(--fg-muted); display: flex; align-items: center; gap: 6px;
  color: var(--amber);
}
.alert-banner strong { color: var(--amber); }

/* ---- PHILOSOPHY ---- */
.philosophy { padding: 80px var(--pad-x); background: var(--bg-section); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.philosophy-inner { max-width: var(--max-w); margin: 0 auto; text-align: center; }
.section-label { font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--fg-muted); margin-bottom: 20px; }
.philosophy-headline {
  font-family: var(--font-display); font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700; letter-spacing: -1px; color: var(--fg); line-height: 1.25;
  margin-bottom: 60px; max-width: 640px; margin-left: auto; margin-right: auto;
}
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.why-item { text-align: center; }
.why-icon {
  width: 52px; height: 52px; background: var(--accent-dim); border: 1px solid rgba(0,212,170,0.2);
  border-radius: 16px; display: flex; align-items: center; justify-content: center;
  color: var(--accent); margin: 0 auto 18px;
}
.why-item h4 { font-family: var(--font-display); font-size: 16px; font-weight: 700; color: var(--fg); margin-bottom: 10px; }
.why-item p { font-size: 14px; color: var(--fg-muted); line-height: 1.65; max-width: 240px; margin: 0 auto; }

/* ---- CLOSING ---- */
.closing { padding: 100px var(--pad-x); }
.closing-inner { max-width: var(--max-w); margin: 0 auto; text-align: center; }
.closing-quote {
  font-family: var(--font-display); font-size: clamp(22px, 3vw, 34px);
  font-weight: 600; color: var(--fg); line-height: 1.4; letter-spacing: -0.5px;
  max-width: 720px; margin: 0 auto 64px;
  font-style: normal;
}
.closing-headline {
  font-family: var(--font-display); font-size: 26px; font-weight: 800;
  color: var(--fg); margin-bottom: 12px; letter-spacing: -0.5px;
}
.closing-sub { font-size: 16px; color: var(--fg-muted); max-width: 480px; margin: 0 auto; }

/* ---- FOOTER ---- */
.footer { padding: 40px var(--pad-x); border-top: 1px solid var(--border); }
.footer-inner { max-width: var(--max-w); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-tagline { font-size: 13px; color: var(--fg-muted); display: block; margin-top: 4px; }
.footer-meta { font-size: 13px; color: var(--fg-faint); }

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; gap: 32px; }
  .stats-inner { flex-direction: column; gap: 24px; }
  .stat-divider { display: none; }
  .footer-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .hero { padding: 120px var(--pad-x) 60px; }
  .features { padding: 60px var(--pad-x); }
  .philosophy { padding: 60px var(--pad-x); }
  .closing { padding: 60px var(--pad-x); }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-ghost { text-align: center; }
}