/* ============================================================
   码途导航 · 设计基座 (base.css)
   Design tokens / reset / shared primitives
   ============================================================ */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Brand */
  --primary: #4f46e5;
  --primary-600: #4338ca;
  --primary-700: #3730a3;
  --primary-2: #7c3aed;
  --primary-soft: #eef2ff;
  --primary-soft-2: #e0e7ff;
  --accent: #06b6d4;
  --accent-soft: #ecfeff;

  /* Semantic */
  --success: #16a34a;
  --success-soft: #dcfce7;
  --warn: #d97706;
  --warn-soft: #fef3c7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;

  /* Surfaces (light) */
  --bg: #f5f6fb;
  --bg-soft: #eef0f8;
  --surface: #ffffff;
  --surface-2: #f8f9fd;
  --surface-3: #f1f3f9;
  --border: #e6e9f2;
  --border-strong: #d6dbe8;
  --overlay: rgba(15, 23, 42, 0.44);

  /* Text */
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #5f6b7e;
  --text-invert: #ffffff;

  /* Gradients */
  --grad-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 48%, #06b6d4 100%);
  --grad-brand-soft: linear-gradient(135deg, rgba(99, 102, 241, 0.14), rgba(139, 92, 246, 0.1) 55%, rgba(6, 182, 212, 0.12));
  --grad-hero:
    radial-gradient(900px 460px at 12% -6%, rgba(99, 102, 241, 0.20), transparent 62%),
    radial-gradient(760px 420px at 88% 0%, rgba(6, 182, 212, 0.16), transparent 60%),
    radial-gradient(640px 380px at 55% 118%, rgba(139, 92, 246, 0.14), transparent 65%);

  /* Radius */
  --r-xs: 8px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 24px;
  --r-full: 999px;

  /* Shadow */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 2px 8px -2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px -4px rgba(15, 23, 42, 0.10), 0 12px 28px -16px rgba(15, 23, 42, 0.18);
  --shadow-lg: 0 18px 50px -24px rgba(15, 23, 42, 0.28);
  --shadow-brand: 0 10px 30px -12px rgba(79, 70, 229, 0.55);

  /* Layout */
  --maxw: 1520px;
  --gutter: 24px;
  --header-h: 66px;

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", "Courier New", monospace;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.24s;

  /* Elevation for translucent bars */
  --glass: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(255, 255, 255, 0.65);

  color-scheme: light;
}

[data-theme="dark"] {
  --primary: #818cf8;
  --primary-600: #6366f1;
  --primary-700: #4f46e5;
  --primary-2: #a78bfa;
  --primary-soft: rgba(99, 102, 241, 0.16);
  --primary-soft-2: rgba(99, 102, 241, 0.26);
  --accent: #22d3ee;
  --accent-soft: rgba(34, 211, 238, 0.14);

  --success: #4ade80;
  --success-soft: rgba(74, 222, 128, 0.14);
  --warn: #fbbf24;
  --warn-soft: rgba(251, 191, 36, 0.14);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.14);

  --bg: #080b14;
  --bg-soft: #0c111d;
  --surface: #101725;
  --surface-2: #131c2d;
  --surface-3: #182238;
  --border: #1e2a40;
  --border-strong: #2a3954;
  --overlay: rgba(2, 6, 23, 0.66);

  --text: #e8edf7;
  --text-2: #a7b3c8;
  --text-3: #96a5bd;
  --text-invert: #0b1120;

  --grad-brand: linear-gradient(135deg, #818cf8 0%, #a78bfa 48%, #22d3ee 100%);
  --grad-brand-soft: linear-gradient(135deg, rgba(129, 140, 248, 0.16), rgba(167, 139, 250, 0.12) 55%, rgba(34, 211, 238, 0.14));
  --grad-hero:
    radial-gradient(900px 460px at 12% -6%, rgba(99, 102, 241, 0.26), transparent 62%),
    radial-gradient(760px 420px at 88% 0%, rgba(34, 211, 238, 0.16), transparent 60%),
    radial-gradient(640px 380px at 55% 118%, rgba(167, 139, 250, 0.16), transparent 65%);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35), 0 2px 10px -3px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 6px 18px -6px rgba(0, 0, 0, 0.5), 0 16px 40px -22px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 24px 70px -30px rgba(0, 0, 0, 0.85);
  --shadow-brand: 0 12px 34px -14px rgba(99, 102, 241, 0.75);

  --glass: rgba(13, 19, 33, 0.78);
  --glass-border: rgba(148, 163, 184, 0.14);

  color-scheme: dark;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 74px);
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
}

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

ul,
ol {
  list-style: none;
  padding: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

::selection {
  background: var(--primary);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* Scrollbars */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-3);
  background-clip: content-box;
}
::-webkit-scrollbar-track {
  background: transparent;
}

/* ---------- 3. Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- 4. Shared primitives ---------- */
.btn {
  --btn-bg: var(--surface);
  --btn-fg: var(--text);
  --btn-border: var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), background-color 0.18s, border-color 0.18s, color 0.18s;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn:active {
  transform: translateY(0);
}
.btn svg {
  width: 17px;
  height: 17px;
  flex: none;
}

.btn-primary {
  --btn-bg: var(--primary);
  --btn-fg: #fff;
  --btn-border: transparent;
  background-image: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  box-shadow: var(--shadow-brand);
}
.btn-primary:hover {
  background-image: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-2) 100%);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-border: transparent;
  --btn-fg: var(--text-2);
}
.btn-ghost:hover {
  --btn-bg: var(--surface-3);
  --btn-fg: var(--text);
  box-shadow: none;
}

.btn-soft {
  --btn-bg: var(--primary-soft);
  --btn-fg: var(--primary);
  --btn-border: transparent;
}

.btn-sm {
  height: 34px;
  padding: 0 12px;
  font-size: 13px;
  border-radius: var(--r-xs);
}

.btn-block {
  width: 100%;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  color: var(--text-2);
  transition: background-color 0.18s, color 0.18s, border-color 0.18s, transform 0.18s var(--ease);
}
.icon-btn:hover {
  background: var(--surface-3);
  color: var(--text);
  border-color: var(--border);
}
.icon-btn:active {
  transform: scale(0.95);
}
.icon-btn svg {
  width: 19px;
  height: 19px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 20px;
  padding: 0 7px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  background: var(--surface-3);
  color: var(--text-2);
  white-space: nowrap;
}
.badge-hot {
  background: linear-gradient(135deg, #fb7185, #f43f5e);
  color: #fff;
}
.badge-new {
  background: var(--success-soft);
  color: var(--success);
}
.badge-primary {
  background: var(--primary-soft);
  color: var(--primary);
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-3);
  font-size: 11.5px;
  line-height: 1;
  white-space: nowrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 13px;
  border-radius: var(--r-full);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.18s var(--ease);
}
.chip:hover {
  color: var(--primary);
  border-color: var(--primary-soft-2);
  background: var(--primary-soft);
  transform: translateY(-1px);
}

.kbd {
  display: inline-grid;
  place-items: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: 5px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  background: var(--surface-2);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
}

.mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
}

.divider {
  height: 1px;
  background: var(--border);
  border: 0;
}

.muted {
  color: var(--text-2);
}

.text-gradient {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Section head (shared between pages) */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

/* Toast */
.toast-stack {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transform: translateX(-50%);
  pointer-events: none;
}
.toast {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: min(90vw, 460px);
  padding: 10px 16px;
  border-radius: var(--r-full);
  background: rgba(15, 23, 42, 0.92);
  color: #f8fafc;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  animation: toast-in 0.3s var(--ease);
}
.toast svg {
  width: 16px;
  height: 16px;
  flex: none;
}
.toast[data-type="success"] svg {
  color: #4ade80;
}
.toast[data-type="warn"] svg {
  color: #fbbf24;
}
.toast[data-type="error"] svg {
  color: #f87171;
}
.toast.is-out {
  animation: toast-out 0.25s var(--ease) forwards;
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }
}

/* ---------- 5. Scroll reveal & motion ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@keyframes float-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.82);
  }
}
@keyframes shimmer {
  from {
    background-position: 200% 0;
  }
  to {
    background-position: -200% 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* 截图 / 静态渲染模式：在 URL 后加 ?static=1，禁用一切动效，便于视觉验收 */
html.no-anim *,
html.no-anim *::before,
html.no-anim *::after {
  animation: none !important;
  transition: none !important;
}
html.no-anim [data-reveal] {
  opacity: 1 !important;
  transform: none !important;
}
html.no-anim {
  scroll-behavior: auto;
}

/* ---------- 6. Responsive base ---------- */
@media (max-width: 720px) {
  :root {
    --gutter: 16px;
    --header-h: 60px;
  }
  body {
    font-size: 14.5px;
  }
}