:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #eef4ff;
  --text: #142033;
  --muted: #64748b;
  --line: #dbe4f0;
  --primary: #2563eb;
  --primary-2: #1d4ed8;
  --accent: #06b6d4;
  --warning: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  --code-bg: #0f172a;
  --code-text: #dbeafe;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.12);
  --radius: 22px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 34rem),
    radial-gradient(circle at top right, rgba(6, 182, 212, 0.14), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

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

code {
  border-radius: 0.45rem;
  background: rgba(37, 99, 235, 0.1);
  color: #1e40af;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.92em;
  padding: 0.12rem 0.34rem;
}

pre {
  margin: 1rem 0 0;
  overflow-x: auto;
  border-radius: 18px;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1.1rem;
  line-height: 1.55;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 0.9rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(219, 228, 240, 0.75);
  background: rgba(246, 248, 251, 0.86);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 0.95rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 0.85rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-size: 0.85rem;
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.25);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
}

.nav-links a {
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.94rem;
  padding: 0.5rem 0.8rem;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background: white;
  color: var(--primary);
}

.section-pad {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 5rem 0;
}

.section-pad.compact {
  padding: 2rem 0;
}

.alt {
  width: 100%;
  max-width: none;
  padding-right: max(1rem, calc((100% - var(--max)) / 2));
  padding-left: max(1rem, calc((100% - var(--max)) / 2));
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.66), rgba(238, 244, 255, 0.55));
}

.hero {
  padding-top: 6.5rem;
  padding-bottom: 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  align-items: center;
  gap: 2rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.75rem, 7vw, 5.7rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: 1.18rem;
}

p {
  margin: 0;
  color: var(--muted);
}

.hero-copy {
  max-width: 720px;
  margin-top: 1.25rem;
  font-size: 1.18rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  border-radius: 999px;
  font-weight: 800;
  padding: 0.75rem 1.15rem;
}

.button.primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 16px 34px rgba(37, 99, 235, 0.26);
}

.button.primary:hover {
  background: var(--primary-2);
}

.button.ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  color: var(--text);
}

.experience-cta {
  margin: 1.5rem 0 0;
  color: var(--muted);
}

.experience-cta a.inline-link:link,
.experience-cta a.inline-link:visited {
  color: var(--primary);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.experience-cta a.inline-link:hover,
.experience-cta a.inline-link:focus-visible {
  color: var(--primary-2);
}

.hero-card,
.notice-card,
.feature-card,
.step-card,
.code-card,
.admin-card,
.warning-card,
.tip-card,
.security-card,
details {
  border: 1px solid rgba(219, 228, 240, 0.9);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 18px 56px rgba(15, 23, 42, 0.07);
}

.hero-card {
  padding: 1.15rem;
}

.metric {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(6, 182, 212, 0.08));
  padding: 1rem;
}

.metric + .metric {
  margin-top: 0.75rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.92rem;
}

.metric strong {
  font-size: 1.08rem;
}

.notice-card {
  border-left: 5px solid var(--warning);
  padding: 1.35rem;
}

.notice-card h2 {
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 2rem;
}

.section-heading p:not(.eyebrow) {
  margin-top: 0.85rem;
  font-size: 1.04rem;
}

.feature-grid,
.steps,
.code-grid,
.security-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.feature-grid.tight {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.feature-card,
.security-card {
  padding: 1.35rem;
}

.feature-card p,
.security-card p,
.admin-card p {
  margin-top: 0.65rem;
}

.steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step-card {
  position: relative;
  overflow: hidden;
  padding: 1.35rem;
}

.step-card::after {
  position: absolute;
  right: -2.6rem;
  bottom: -3rem;
  width: 8rem;
  height: 8rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  content: "";
}

.step-number {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.9rem;
  border-radius: 999px;
  background: var(--primary);
  color: white;
  font-weight: 900;
}

.step-card p {
  margin-top: 0.7rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: white;
  box-shadow: 0 18px 56px rgba(15, 23, 42, 0.06);
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 1rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8fafc;
  color: #334155;
  font-size: 0.9rem;
}

td {
  color: var(--muted);
}

td:first-child {
  color: var(--text);
  font-weight: 800;
}

tr:last-child td {
  border-bottom: 0;
}

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

.code-card {
  padding: 1.35rem;
}

.code-card p {
  margin-top: 0.65rem;
}

.tip-card {
  margin-top: 1rem;
  border-left: 5px solid var(--accent);
  padding: 1.35rem;
}

.tip-card p,
.warning-card p {
  margin-top: 0.65rem;
}

.admin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 1rem;
}

.wide {
  min-width: 0;
}

.admin-card,
.warning-card {
  padding: 1.35rem;
}

.warning-card {
  margin-top: 1rem;
  border-left: 5px solid var(--danger);
}

.check-list {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin-top: 0.6rem;
  color: var(--muted);
  padding-left: 1.5rem;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 0.05rem;
  color: var(--success);
  content: "✓";
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: 0.8rem;
}

details {
  padding: 1.1rem 1.25rem;
}

summary {
  cursor: pointer;
  color: var(--text);
  font-weight: 850;
}

details p {
  margin-top: 0.85rem;
}

details pre {
  margin-top: 0.85rem;
}

.security-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 2rem 1rem;
  text-align: center;
}

@media (max-width: 980px) {
  .hero-grid,
  .admin-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 720px) {
  .site-header {
    position: static;
  }

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

  .nav-links {
    justify-content: flex-start;
  }

  .nav-links a {
    background: rgba(255, 255, 255, 0.7);
  }

  .section-pad,
  .alt {
    width: min(100% - 1rem, var(--max));
    padding: 3.25rem 0.5rem;
  }

  .section-pad.compact {
    padding: 1.25rem 0.5rem;
  }

  .hero {
    padding-top: 3.5rem;
  }

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

  .hero-actions .button {
    width: 100%;
  }

  h1 {
    font-size: clamp(2.45rem, 15vw, 4rem);
  }

  pre {
    border-radius: 14px;
    padding: 0.95rem;
  }
}