:root {
  --landing-text: #0f172a;
  --landing-muted: #64748b;
  --landing-border: #e2e8f0;
  --landing-accent: #0284c7;
  --landing-accent-hover: #0369a1;
  --landing-bg: #ffffff;
  --landing-subtle: #f8fafc;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--landing-text);
  background: var(--landing-bg);
  line-height: 1.5;
}

.landing-header {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--landing-border);
  background: var(--landing-bg);
}

.landing-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.landing-badge {
  margin-left: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--landing-muted);
  padding: 2px 8px;
  border: 1px solid var(--landing-border);
  border-radius: 999px;
  vertical-align: middle;
}

.landing-muted-link {
  font-size: 13px;
  color: var(--landing-muted);
  text-decoration: none;
}

.landing-muted-link:hover {
  color: var(--landing-accent);
}

.landing-header-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.landing-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px 64px;
  display: grid;
  gap: 48px;
}

@media (min-width: 800px) {
  .landing-main {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
    gap: 56px;
  }
}

.landing-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.landing-lead {
  margin: 0 0 28px;
  font-size: 16px;
  color: var(--landing-muted);
  max-width: 36em;
}

.landing-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.landing-points li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--landing-text);
}

.landing-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--landing-accent);
  opacity: 0.85;
}

.landing-card {
  background: var(--landing-bg);
  border: 1px solid var(--landing-border);
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.landing-card h2 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.landing-card-hint {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--landing-muted);
}

.landing-card form label {
  display: block;
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--landing-muted);
}

.landing-card form input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--landing-border);
  border-radius: 8px;
  background: #fff;
  color: var(--landing-text);
}

.landing-card form input:focus {
  outline: none;
  border-color: var(--landing-accent);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.12);
}

.landing-submit {
  width: 100%;
  margin-top: 8px;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--landing-accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.landing-submit:hover {
  background: var(--landing-accent-hover);
}

.landing-secondary {
  width: 100%;
  margin-top: 12px;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--landing-text);
  background: var(--landing-subtle);
  border: 1px solid var(--landing-border);
  border-radius: 8px;
  cursor: pointer;
}

.landing-secondary:hover {
  border-color: var(--landing-muted);
}

.landing-link {
  display: block;
  width: 100%;
  margin-top: 10px;
  padding: 8px;
  font-size: 13px;
  color: var(--landing-muted);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.landing-err {
  margin-top: 12px;
  padding: 10px 12px;
  font-size: 13px;
  color: #b91c1c;
  background: #fef2f2;
  border-radius: 8px;
  border: 1px solid #fecaca;
}

.landing-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  font-size: 12px;
  color: var(--landing-muted);
  text-align: center;
  border-top: 1px solid var(--landing-border);
}

.hidden {
  display: none !important;
}

@media (max-width: 768px) {
  .landing-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: max(14px, env(safe-area-inset-top, 0px)) 16px 14px;
  }

  .landing-header-nav {
    gap: 10px 14px;
  }

  .landing-muted-link {
    font-size: 14px;
    padding: 6px 0;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .landing-main {
    padding: 20px 16px 40px;
    gap: 28px;
  }

  .landing-card {
    order: -1;
    padding: 20px 18px;
  }

  .landing-hero h1 {
    font-size: 24px;
  }

  .landing-lead {
    font-size: 15px;
    margin-bottom: 20px;
  }

  .landing-submit,
  .landing-secondary {
    min-height: 48px;
    font-size: 16px;
  }

  .landing-footer {
    padding: 20px 16px max(20px, env(safe-area-inset-bottom, 0px));
  }
}