/* =========================
   Global baseline
   ========================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}

/* =========================
   Brand
   ========================= */
.brand {
  color: var(--primary);
  font-weight: 600;
}


/* =========================
   Layout container
   ========================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

/* =========================
   Typography
   ========================= */
h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-3);
}

h1 {
  font-size: 34px;
  margin-top: var(--space-2);
}

h2 {
  font-size: 22px;
  margin-top: var(--space-6);
}

h3 {
  font-size: 18px;
  margin-top: var(--space-5);
}

p {
  margin: 0 0 var(--space-3);
  color: var(--text);
}

p.muted,
.small,
small {
  color: var(--muted);
}

ul,
ol {
  margin: 0 0 var(--space-3);
  padding-left: 20px;
}

li {
  margin: 6px 0;
}

/* =========================
   Links
   ========================= */
a {
  color: var(--link);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* =========================
   Buttons (Wiz-style)
   ========================= */
a.btn,
button.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition:
    background 0.12s ease,
    border-color 0.12s ease,
    box-shadow 0.12s ease,
    transform 0.08s ease;
}

a.btn:hover,
button.btn:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

/* Primary CTA */
a.btn.primary,
button.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}

a.btn.primary:hover,
button.btn.primary:hover {
  background: var(--primary-600);
  border-color: var(--primary-600);
}

/* Optional secondary style */
a.btn.secondary,
button.btn.secondary {
  background: #fff;
  border-color: rgba(47, 107, 255, 0.35);
  color: var(--primary);
}

a.btn.secondary:hover,
button.btn.secondary:hover {
  background: var(--primary-100);
  border-color: rgba(47, 107, 255, 0.55);
}

/* =========================
   Sections / Cards
   ========================= */
.section {
  margin-top: var(--space-6);
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow 0.12s ease,
    transform 0.1s ease,
    border-color 0.12s ease;
}

.card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

/* =========================
   Hero (Landing)
   ========================= */
.hero {
  padding-top: 3.5rem;
  padding-bottom: 2.5rem;
  border-radius: 18px;
  background:
    radial-gradient(
      900px 350px at 15% 10%,
      rgba(47, 107, 255, 0.14),
      transparent 60%
    ),
    radial-gradient(
      700px 280px at 85% 0%,
      rgba(47, 107, 255, 0.1),
      transparent 55%
    );
}

.hero h1 {
  max-width: 26ch;
  line-height: 1.08;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  max-width: 72ch;
  line-height: 1.65;
  margin-top: 0.25rem;
  margin-bottom: 1.25rem;
}

.hero-actions {
  margin-top: 0.25rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

@media (max-width: 640px) {
  .hero {
    padding-top: 2.5rem;
    padding-bottom: 2rem;
  }

  .hero h1 {
    max-width: 18ch;
  }
}

/* =========================
   Header / Nav
   ========================= */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}

/* =========================
   Nav active state (only nav)
   ========================= */

/* 默认导航项：黑色 */
.nav a {
  color: var(--text);
  font-weight: 500;
  text-decoration: none;
}

/* hover 可要可不要，不影响当前需求 */
.nav a:hover {
  color: var(--primary);
}

/* 当前页面的导航项 */
.nav a.active,
.nav a[aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

.nav button,
.nav .nav-dropdown-btn {
  font-size: 14px;
}

/* =========================
   Footer
   ========================= */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 56px;
  padding-top: var(--space-4);
}

/* =========================
   Tables (future-safe)
   ========================= */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 10px 8px;
  text-align: left;
}

th {
  font-weight: 600;
}

/* =========================
   Code blocks
   ========================= */
code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
}

pre {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  overflow: auto;
  background: #fafafa;
}

/* =========================
   HR
   ========================= */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-6) 0;
}