:root {
  --bg-dark: #050914;
  --bg-dark-alt: #0b1222;
  --bg-light: #f5f7fb;
  --accent: #00d4ff;
  --accent-soft: rgba(0, 212, 255, 0.18);
  --accent-strong: #1dd1a1;
  --text-main: #f7f9ff;
  --text-muted: #9aa3c5;
  --border-soft: rgba(255, 255, 255, 0.08);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.45);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition-fast: 0.18s ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-dark);
}

body {
  min-height: 100vh;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 10% 0%, rgba(0, 212, 255, 0.18), transparent 55%),
    radial-gradient(circle at 90% 100%, rgba(61, 245, 167, 0.16), transparent 55%),
    linear-gradient(135deg, #040615 0%, #050914 25%, #060b18 55%, #02040a 100%),
    url("https://images.pexels.com/photos/6802044/pexels-photo-6802044.jpeg?auto=compress&cs=tinysrgb&w=1600")
      center/cover no-repeat fixed;
  mix-blend-mode: screen;
  opacity: 0.75;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: radial-gradient(circle at 0 0, rgba(0, 212, 255, 0.12), transparent 60%),
    rgba(4, 7, 20, 0.88);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.container {
  width: min(1120px, 100% - 32px);
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 14px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast),
    text-shadow var(--transition-fast);
}

.logo::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: radial-gradient(circle, #ff4757, #ff6b81);
  box-shadow: 0 0 12px rgba(255, 71, 87, 0.9);
}

.logo:hover {
  color: #6ee7ff;
  transform: translateY(-1px);
  text-shadow: 0 0 14px rgba(0, 212, 255, 0.35);
}

.nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 999px;
  transition: color var(--transition-fast), background-color var(--transition-fast),
    transform var(--transition-fast);
}

.nav a:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.06);
  transform: translateY(-1px);
}

.hero {
  padding: 80px 0 60px;
  background-image: url(dan.png);
  background-repeat: no-repeat;
  background-position: right 580px top -40px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.3;
  margin: 0 0 18px;
}

.hero-subtitle {
  margin: 0 0 24px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, #00d4ff, #1dd1a1);
  color: #04101a;
  box-shadow: 0 14px 30px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(7, 11, 26, 0.7);
}

.btn-secondary:hover {
  background: rgba(10, 16, 35, 0.9);
}

.hero-note {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
}

.hero-panel {
  display: flex;
  justify-content: flex-end;
}

.panel-card {
  width: 100%;
  max-width: 360px;
  padding: 20px 20px 18px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 0 0, rgba(0, 212, 255, 0.22), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(29, 209, 161, 0.16), transparent 55%),
    rgba(6, 13, 30, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-soft);
}

.panel-card h2 {
  margin: 0 0 14px;
  font-size: 17px;
}

.panel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.4);
  background-color: rgba(0, 212, 255, 0.08);
  margin-right: 6px;
}

.section {
  padding: 56px 0;
}

.section-light {
  background: radial-gradient(circle at 0 100%, rgba(0, 212, 255, 0.12), transparent 60%),
    rgba(247, 249, 255, 0.98);
  color: #111827;
}

.section-dark {
  background: radial-gradient(circle at 100% 0, rgba(0, 212, 255, 0.12), transparent 55%),
    rgba(4, 7, 20, 0.98);
}

.section-title {
  margin: 0 0 26px;
  font-size: 20px;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.section-title::after {
  content: "";
  width: 52px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.feature-card {
  padding: 18px 18px 16px;
  border-radius: var(--radius-md);
  background: white;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

.feature-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #4b5563;
}

.steps-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.steps-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 16px;
  align-items: flex-start;
  color: var(--text-main);
}

.step-index {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 212, 255, 0.5);
  background: rgba(3, 9, 24, 0.9);
  font-size: 13px;
  color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.08);
}

.steps-list h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.steps-list p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.security-item {
  padding: 16px 18px 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.28);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.08);
}

.security-item h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.security-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #4b5563;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  padding: 14px 16px 12px;
  border-radius: var(--radius-md);
  background: rgba(5, 10, 28, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.32);
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.faq-item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.site-footer {
  padding: 22px 0 26px;
  border-top: 1px solid rgba(148, 163, 184, 0.34);
  background: linear-gradient(to top, rgba(3, 6, 19, 0.98), rgba(5, 10, 28, 0.95));
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.footer-desc {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--text-muted);
}

.footer-icp {
  margin: 6px 0 0;
  font-size: 12px;
}

.footer-icp a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-icp a:hover {
  color: var(--text-main);
}

.footer-note {
  margin: 0;
  font-size: 11px;
  color: var(--text-muted);
  max-width: none;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-panel {
    justify-content: flex-start;
  }

  .panel-card {
    max-width: 420px;
  }

  .header-inner {
    gap: 12px;
  }

  .nav {
    gap: 10px;
    font-size: 13px;
  }

  .nav a {
    padding-inline: 8px;
  }
}

@media (max-width: 720px) {
  .hero {
    padding-top: 64px;
  }

  .header-inner {
    flex-direction: row;
    justify-content: space-between;
  }

  .nav {
    display: none;
  }

  .section {
    padding-block: 44px;
  }

  .features-grid,
  .security-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .panel-card {
    margin-top: 4px;
  }
}