:root {
  color-scheme: light;
  --bg: #0e1116;
  --surface: #151a22;
  --card: #1d2330;
  --text: #f5f7fb;
  --muted: #a4b1c6;
  --accent: #4fd1c5;
  --accent-dark: #2c9e93;
  --border: rgba(255, 255, 255, 0.08);
}

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

body {
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(14, 17, 22, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
  flex-wrap: wrap;
}

.site-header nav {
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  font-size: 28px;
}

.site-header nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
}

.site-header nav a:hover {
  color: var(--text);
}

.hero {
  padding: 80px 0 60px;
  background: radial-gradient(circle at top left, rgba(79, 209, 197, 0.12), transparent 50%),
    radial-gradient(circle at top right, rgba(79, 209, 197, 0.16), transparent 45%);
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  align-items: center;
}

.hero h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 16px;
}

.hero p {
  color: var(--muted);
  margin-bottom: 20px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.primary,
button {
  background: var(--accent);
  color: #06201e;
  border: none;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary:hover,
button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 20px rgba(79, 209, 197, 0.25);
}

.ghost {
  border: 1px solid var(--accent);
  padding: 12px 20px;
  border-radius: 999px;
  color: var(--accent);
}

.hero-highlights {
  list-style: none;
  display: grid;
  gap: 10px;
  color: var(--muted);
}

.hero-card {
  background: var(--card);
  border-radius: 18px;
  padding: 26px;
  border: 1px solid var(--border);
}

.hero-card ul {
  list-style: none;
  display: grid;
  gap: 12px;
  color: var(--muted);
  margin: 18px 0;
}

.card-header {
  font-weight: 600;
  font-size: 18px;
}

.card-footer {
  font-size: 14px;
  color: var(--accent);
}

.section {
  padding: 70px 0;
}

.section.alt {
  background: var(--surface);
}

.section-title {
  margin-bottom: 32px;
}

.section-title p {
  color: var(--muted);
  margin-top: 10px;
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.form-card,
.status-card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--border);
}

form label {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}

input,
select {
  background: rgba(15, 19, 26, 0.9);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
}

input::placeholder {
  color: rgba(164, 177, 198, 0.6);
}

.form-footer {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}

.form-footer p {
  color: var(--muted);
  font-size: 13px;
}

.status-card h4 {
  margin-bottom: 8px;
}

.muted {
  color: var(--muted);
  font-size: 14px;
}

.status-log {
  margin-top: 18px;
  background: #0c0f14;
  border-radius: 12px;
  padding: 16px;
  min-height: 180px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  overflow-y: auto;
  color: #c3d3e6;
}

.status-meta {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.grid article {
  background: var(--card);
  border-radius: 14px;
  padding: 20px;
  border: 1px solid var(--border);
}

.card-link {
  color: var(--accent);
  font-weight: 600;
}

.card-link:hover {
  color: #7ef0e3;
}

.page-hero {
  padding: 60px 0 40px;
}

.page-hero h2 {
  font-size: clamp(26px, 3vw, 34px);
  margin-bottom: 12px;
}

.page-content {
  display: grid;
  gap: 18px;
  color: var(--muted);
}

.checkout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.summary-list {
  list-style: none;
  display: grid;
  gap: 10px;
  color: var(--muted);
  margin-top: 12px;
}

.summary-total {
  margin-top: 16px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.notice {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: rgba(12, 15, 20, 0.7);
  color: var(--muted);
  font-size: 13px;
}

.notice strong {
  color: var(--text);
}

.auth-actions {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.auth-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 19, 26, 0.9);
  color: var(--text);
  font-weight: 600;
}

.auth-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hidden {
  display: none !important;
}

.user-inline {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  object-fit: cover;
}

.timeline {
  display: grid;
  gap: 20px;
}

.timeline-item {
  display: flex;
  gap: 16px;
  background: var(--card);
  padding: 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.step {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #09241f;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0 50px;
  background: #0b0e13;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--muted);
}

@media (max-width: 720px) {
  .site-header nav {
    flex-wrap: wrap;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero {
    padding: 60px 0 40px;
  }

  .status-log {
    min-height: 140px;
  }

  .timeline-item {
    flex-direction: column;
  }
}

@media (max-width: 960px) {
  .site-header nav {
    font-size: 13px;
    gap: 12px;
  }

  .hero-grid {
    gap: 28px;
  }

  .experience-grid,
  .checkout-grid,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .site-footer .container {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .brand {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero h2 {
    font-size: 26px;
  }

  .card-footer {
    font-size: 12px;
  }

  button,
  .primary,
  .ghost,
  .auth-button {
    width: 100%;
    text-align: center;
  }

  .summary-list {
    font-size: 13px;
  }
}