:root {
  --bg: #05070d;
  --bg-2: #0b1020;
  --panel: rgba(18, 24, 38, 0.78);
  --panel-strong: rgba(20, 27, 43, 0.92);
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.2);
  --text: #f7f9ff;
  --muted: #aab4c8;
  --subtle: #768198;
  --gold: #f3ba2f;
  --cyan: #2ee9ff;
  --green: #2fe69b;
  --danger: #ffb15f;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.5);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 10%, rgba(243, 186, 47, 0.18), transparent 25%),
    radial-gradient(circle at 82% 6%, rgba(46, 233, 255, 0.16), transparent 28%),
    radial-gradient(circle at 50% 92%, rgba(47, 230, 155, 0.12), transparent 34%),
    linear-gradient(145deg, #04060b 0%, #080d19 42%, #0d1322 100%);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent 80%);
}

body::after {
  content: "";
  position: fixed;
  inset: auto -20% -30% -20%;
  height: 420px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(46, 233, 255, 0.15), rgba(243, 186, 47, 0.12), transparent);
  filter: blur(60px);
}

.page-shell {
  width: min(1080px, calc(100% - 36px));
  margin: 0 auto;
  padding: 48px 0 38px;
  position: relative;
  z-index: 1;
}

.hero {
  text-align: center;
  padding: 20px 0 30px;
}

.brand-mark {
  width: 82px;
  height: 82px;
  margin: 0 auto 22px;
  position: relative;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(243,186,47,0.95), rgba(46,233,255,0.16));
  box-shadow: 0 0 48px rgba(243, 186, 47, 0.18), inset 0 0 20px rgba(255,255,255,0.24);
}

.brand-core {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(5, 7, 13, 0.86);
  color: var(--gold);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: -0.06em;
}

.brand-orbit {
  position: absolute;
  inset: -8px;
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: 50%;
  border-left-color: transparent;
  border-bottom-color: rgba(46,233,255,0.55);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 800;
}

h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 14px;
  font-size: clamp(36px, 6.4vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.06em;
  text-shadow: 0 18px 48px rgba(0,0,0,0.5);
}

.hero-copy {
  width: min(720px, 100%);
  margin: 0 auto 22px;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.8;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.hero-badges span {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.055);
  color: #dfe6f5;
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 13px;
  backdrop-filter: blur(16px);
}

.notice-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 18px;
  margin: 18px auto 30px;
}

.panel,
.exchange-card,
.tutorial-row {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.105), rgba(255,255,255,0.045));
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.panel {
  padding: 24px;
  border-radius: var(--radius-lg);
}

.panel-primary { background: linear-gradient(150deg, rgba(243,186,47,0.12), rgba(18,24,38,0.72) 44%, rgba(46,233,255,0.08)); }
.panel-muted { background: linear-gradient(150deg, rgba(255,255,255,0.08), rgba(18,24,38,0.72)); }

.panel-header {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
}

.panel-header h2 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.icon-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  color: #061016;
  font-weight: 900;
  flex: 0 0 auto;
}
.icon-dot.info { background: var(--cyan); }
.icon-dot.alert { background: var(--danger); }

.check-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
  color: #e5ebf7;
  line-height: 1.55;
}

.check-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
}

.check-list li::before {
  content: "✓";
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(47, 230, 155, 0.16);
  color: var(--green);
  font-weight: 900;
  font-size: 13px;
}

.panel p {
  color: var(--muted);
  line-height: 1.85;
  margin-bottom: 0;
}

.exchange-section,
.tutorial-section {
  margin-top: 28px;
}

.section-heading {
  display: block;
  margin-bottom: 16px;
}

.section-heading h2 {
  margin: 0;
  font-size: 32px;
  letter-spacing: -0.04em;
}
.section-heading.compact { margin-top: 32px; }

.exchange-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.exchange-card,
.tutorial-row {
  text-decoration: none;
  color: var(--text);
  min-height: 104px;
  border-radius: var(--radius-md);
  display: grid;
  grid-template-columns: 62px 1fr 24px;
  gap: 16px;
  align-items: center;
  padding: 18px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
}

.exchange-card:hover,
.tutorial-row:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: linear-gradient(180deg, rgba(255,255,255,0.14), rgba(255,255,255,0.07));
  box-shadow: 0 32px 90px rgba(0,0,0,0.58), 0 0 0 1px rgba(255,255,255,0.05) inset;
}

.exchange-card.binance:hover { box-shadow: 0 28px 90px rgba(243, 186, 47, 0.14), var(--shadow); }
.exchange-card.okx:hover { box-shadow: 0 28px 90px rgba(46, 233, 255, 0.12), var(--shadow); }

.logo-box {
  width: 62px;
  height: 62px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 950;
  letter-spacing: -0.06em;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12);
}
.logo-binance { background: #f3ba2f; color: #101010; font-size: 30px; }
.logo-okx { background: #f3f6fb; color: #080b10; font-size: 19px; }
.logo-guide { background: linear-gradient(135deg, rgba(46,233,255,0.24), rgba(243,186,47,0.22)); color: #fff; font-size: 28px; }

.card-text strong,
.tutorial-row strong {
  display: block;
  font-size: 18px;
  letter-spacing: -0.025em;
  margin-bottom: 6px;
}

.card-text small,
.tutorial-row small {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.arrow {
  color: var(--subtle);
  font-size: 20px;
}

.tutorial-list {
  display: grid;
  gap: 12px;
}

.tutorial-row {
  min-height: 88px;
  grid-template-columns: 54px 1fr;
}

.static-row:hover { transform: none; }

.video-icon,
.chat-icon,
.shield-icon {
  width: 54px;
  height: 54px;
  border-radius: 17px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,0.09);
  color: #fff;
  font-weight: 900;
}
.video-icon { background: linear-gradient(135deg, #ff4b55, #ff8a65); }
.chat-icon { background: linear-gradient(135deg, #2ee9ff, #2664ff); }
.shield-icon { background: linear-gradient(135deg, #2fe69b, #167a55); }

.footer-note {
  margin: 24px auto 0;
  color: var(--subtle);
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
  width: min(760px, 100%);
}

.footer-note p { margin-bottom: 0; }

@media (max-width: 820px) {
  .page-shell { width: min(100% - 28px, 680px); padding-top: 34px; }
  .notice-grid,
  .exchange-grid { grid-template-columns: 1fr; }
  .exchange-card { min-height: 96px; }
}

@media (max-width: 520px) {
  .hero { padding-top: 8px; }
  .brand-mark { width: 70px; height: 70px; }
  .brand-core { width: 48px; height: 48px; font-size: 26px; }
  h1 { font-size: 38px; }
  .panel { padding: 20px; border-radius: 22px; }
  .exchange-card,
  .tutorial-row {
    grid-template-columns: 52px 1fr 18px;
    padding: 14px;
    gap: 12px;
    border-radius: 18px;
  }
  .tutorial-row { grid-template-columns: 48px 1fr; }
  .logo-box { width: 52px; height: 52px; border-radius: 15px; }
  .card-text strong, .tutorial-row strong { font-size: 16px; }
  .hero-badges span { font-size: 12px; }
}


/* Mobile conversion-first ordering */
@media (max-width: 640px) {
  .page-shell {
    display: flex;
    flex-direction: column;
    padding-top: 22px;
  }

  .hero {
    order: 1;
    padding-bottom: 14px;
  }

  .exchange-section {
    order: 2;
    margin-top: 10px;
  }

  .notice-grid {
    order: 3;
    margin-top: 22px;
  }

  .tutorial-section {
    order: 4;
  }

  .footer-note {
    order: 5;
  }

  .brand-mark {
    margin-bottom: 14px;
  }

  h1 {
    margin-bottom: 10px;
    font-size: clamp(34px, 10vw, 42px);
  }

  .hero-copy {
    margin-bottom: 14px;
    font-size: 15px;
    line-height: 1.65;
  }

  .hero-badges {
    gap: 7px;
  }

  .section-heading {
    margin-bottom: 10px;
  }

  .section-heading h2 {
    font-size: 30px;
  }

  .exchange-grid {
    gap: 10px;
  }
}