:root {
  --bg: #0b1026;
  --bg-soft: #121a3d;
  --text: #f4f6ff;
  --muted: #b7bfdc;
  --brand: #7c5cff;
  --brand-2: #26d0ff;
  --card: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 20% 10%, #25306b 0%, var(--bg) 40%, #070b1a 100%);
  color: var(--text);
  min-height: 100vh;
}

.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(520px 300px at 85% 12%, rgba(38, 208, 255, 0.2), transparent),
    radial-gradient(620px 380px at 10% 80%, rgba(124, 92, 255, 0.18), transparent);
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(8, 12, 30, 0.6);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 0;
}

.logo {
  color: var(--text);
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 700;
}

.logo span {
  color: var(--brand-2);
  margin-left: 2px;
}

.main-nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  transition: 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
}

.menu-toggle {
  display: none;
  margin-left: auto;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 12px;
  font-weight: 600;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
}

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--border);
}

.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 26px;
  padding: 56px 0 24px;
}

.tag {
  color: var(--brand-2);
  font-weight: 700;
}

h1 {
  font-size: clamp(1.9rem, 3vw, 3rem);
  line-height: 1.25;
  margin: 10px 0 14px;
}

.sub {
  color: var(--muted);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  backdrop-filter: blur(5px);
}

.hero-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero-card li {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  padding: 10px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.feature-grid,
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 14px 0 34px;
}

.page-main {
  padding: 32px 0 34px;
}

.room span {
  color: var(--brand-2);
  font-size: 0.95rem;
}

.two-col {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 18px;
}

.chat-list ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.chat-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  padding: 12px;
  border-radius: 12px;
}

.chat-list li.active {
  background: rgba(124, 92, 255, 0.2);
  color: var(--text);
}

.bubble {
  max-width: 78%;
  margin: 10px 0;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
}

.bubble.me {
  margin-left: auto;
  background: linear-gradient(120deg, rgba(124, 92, 255, 0.8), rgba(38, 208, 255, 0.8));
}

.fake-input {
  margin-top: 14px;
  display: flex;
  gap: 10px;
}

.fake-input input {
  flex: 1;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
}

.fake-input button {
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
}

.profile-top {
  display: flex;
  align-items: center;
  gap: 16px;
}

.avatar {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: linear-gradient(120deg, var(--brand), var(--brand-2));
}

.stats {
  display: flex;
  gap: 20px;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
  padding: 15px 0;
}

.site-footer a {
  color: #fff;
  text-decoration: underline;
}

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

  .feature-grid,
  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .menu-toggle {
    display: block;
  }

  .desktop-only {
    display: none;
  }

  .main-nav {
    position: absolute;
    left: 4%;
    right: 4%;
    top: 64px;
    display: none;
    flex-direction: column;
    padding: 14px;
    border-radius: 14px;
    background: rgba(10, 15, 36, 0.96);
    border: 1px solid var(--border);
  }

  .main-nav.open {
    display: flex;
  }

  .hero-actions,
  .stats {
    flex-wrap: wrap;
  }

  .feature-grid,
  .cards {
    grid-template-columns: 1fr;
  }
}