:root {
  --bg-top: #111721;
  --bg-bottom: #06080d;
  --card-bg: rgba(16, 21, 31, 0.88);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: #f6f8fb;
  --muted: #99a5b7;
  --primary: #45d3c5;
  --primary-strong: #9af0d6;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
  --radius-xl: 28px;
  --radius-lg: 18px;
  --font-main: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-main);
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(69, 211, 197, 0.22), transparent 34%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

body {
  min-height: 100vh;
}

.landing-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.landing-card {
  width: min(100%, 560px);
  padding: 44px 32px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
  text-align: center;
}

.landing-logo {
  width: 84px;
  height: 84px;
  border-radius: 24px;
  object-fit: cover;
  box-shadow: 0 16px 40px rgba(69, 211, 197, 0.24);
}

.landing-tag {
  margin: 18px 0 10px;
  color: var(--primary-strong);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.28em;
}

.landing-card h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
}

.landing-desc {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.landing-actions {
  margin-top: 34px;
  display: grid;
  gap: 14px;
}

.landing-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-size: 17px;
  font-weight: 700;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

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

.landing-btn-primary {
  color: #04110f;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-strong) 100%);
  box-shadow: 0 18px 32px rgba(69, 211, 197, 0.2);
}

.landing-btn-secondary {
  color: var(--text);
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
}

.landing-btn-secondary:hover {
  border-color: rgba(69, 211, 197, 0.5);
  background: rgba(255, 255, 255, 0.08);
}

@media (max-width: 640px) {
  .landing-shell {
    padding: 16px;
  }

  .landing-card {
    padding: 34px 20px 24px;
    border-radius: 22px;
  }

  .landing-logo {
    width: 72px;
    height: 72px;
    border-radius: 20px;
  }

  .landing-btn {
    min-height: 54px;
    font-size: 16px;
  }
}