* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --text: #f7fbff;
  --muted: rgba(255,255,255,0.78);
  --line: rgba(255,255,255,0.16);
  --glass: rgba(17, 30, 46, 0.34);
  --glass-strong: rgba(12, 25, 41, 0.50);
  --primary: #7fd0ff;
  --primary-strong: #a8e6ff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(10,20,34,0.20), rgba(8,16,28,0.70)),
    url("background.png") center center / cover no-repeat fixed;
  position: relative;
  overflow-x: hidden;
}

.bg-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.12), transparent 32%),
    radial-gradient(circle at bottom right, rgba(127,208,255,0.12), transparent 30%);
  z-index: 0;
}

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(6, 14, 24, 0.16);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 26px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.96rem;
  transition: 0.25s ease;
}

.nav-links a:hover {
  color: #fff;
}

.hero {
  padding: 88px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 26px;
  align-items: center;
  min-height: calc(100vh - 150px);
}

.hero-content h1 {
  font-size: clamp(2.3rem, 4.5vw, 4.6rem);
  line-height: 1.08;
  margin: 14px 0 16px;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.hero-content p {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.9;
}

.tag,
.mini-title {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: #e9f7ff;
  font-size: 0.82rem;
  letter-spacing: 1px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
  transition: 0.25s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #07304d;
  box-shadow: 0 12px 30px rgba(127, 208, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
}

.btn-secondary {
  color: #fff;
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.16);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.10);
}

.server-box {
  margin-top: 28px;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.07);
  border-radius: 18px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  max-width: 640px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.server-label {
  font-size: 0.86rem;
  color: rgba(255,255,255,0.68);
  margin-bottom: 6px;
}

.server-ip {
  font-size: 1.15rem;
  font-weight: 800;
  word-break: break-all;
}

.copy-btn {
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  color: #07304d;
  background: linear-gradient(135deg, #fff, #cfefff);
}

.glass {
  background: var(--glass);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.hero-card {
  border-radius: 24px;
  padding: 28px;
}

.hero-card h3 {
  margin-bottom: 18px;
  font-size: 1.25rem;
}

.status-list {
  list-style: none;
  display: grid;
  gap: 14px;
}

.status-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.10);
  color: var(--muted);
}

.status-list li:last-child {
  border-bottom: none;
}

.status-list strong {
  color: #fff;
}

.online {
  color: #9ef6b2 !important;
}

.section {
  padding: 42px 0 24px;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  margin: 12px 0;
}

.section-heading p {
  max-width: 720px;
  color: var(--muted);
  line-height: 1.9;
}

.about-grid,
.features-grid {
  display: grid;
  gap: 18px;
}

.about-grid {
  grid-template-columns: repeat(3, 1fr);
}

.features-grid {
  grid-template-columns: repeat(2, 1fr);
}

.card,
.feature-item {
  border-radius: 22px;
  padding: 24px;
}

.card h3,
.feature-item h3 {
  margin-bottom: 12px;
  font-size: 1.15rem;
}

.card p,
.feature-item p {
  color: var(--muted);
  line-height: 1.85;
}

.join-box {
  border-radius: 26px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
}

.join-box h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin: 12px 0;
}

.join-box p {
  color: var(--muted);
  line-height: 1.85;
}

.join-steps {
  display: grid;
  gap: 14px;
}

.step {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
}

.step span {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 800;
  opacity: 0.75;
  margin-bottom: 8px;
}

.site-footer {
  padding: 36px 0 48px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: rgba(255,255,255,0.72);
  font-size: 0.94rem;
}

@media (max-width: 920px) {
  .hero-grid,
  .join-box,
  .about-grid,
  .features-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 64px;
  }

  .hero-grid {
    min-height: auto;
  }

  .nav {
    flex-direction: column;
    gap: 12px;
    padding: 14px 0;
  }

  .nav-links {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 20px, 1180px);
  }

  .server-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .copy-btn {
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }
}