/* ============================================================
   设计系统 — 年轻化风格
   渐变强调色 / 大圆角 / 玻璃拟态 / 深浅色自动切换
   ============================================================ */

:root {
  /* 浅色主题 */
  --bg: #f7f8fc;
  --bg-elevated: #ffffff;
  --bg-soft: #eef0f8;
  --fg: #0f1222;
  --fg-soft: #4a4f6a;
  --fg-muted: #8b90a8;
  --border: rgba(15, 18, 34, 0.08);
  --border-strong: rgba(15, 18, 34, 0.14);

  /* 品牌渐变 */
  --brand-1: #6366f1;
  --brand-2: #a855f7;
  --brand-3: #ec4899;
  --gradient: linear-gradient(135deg, var(--brand-1), var(--brand-2) 50%, var(--brand-3));
  --gradient-soft: linear-gradient(135deg, rgba(99,102,241,.12), rgba(168,85,247,.12) 50%, rgba(236,72,153,.12));

  --accent: #6366f1;
  --accent-contrast: #ffffff;

  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;

  --shadow-sm: 0 1px 2px rgba(15, 18, 34, .04), 0 2px 8px rgba(15, 18, 34, .04);
  --shadow-md: 0 4px 12px rgba(15, 18, 34, .06), 0 12px 32px rgba(15, 18, 34, .08);
  --shadow-lg: 0 8px 24px rgba(15, 18, 34, .08), 0 24px 64px rgba(15, 18, 34, .12);
  --shadow-glow: 0 8px 32px rgba(99, 102, 241, .3);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;

  --max-width: 1120px;
  --header-h: 68px;

  --ease: cubic-bezier(.4, 0, .2, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0b14;
    --bg-elevated: #141622;
    --bg-soft: #1c1f30;
    --fg: #f0f1f7;
    --fg-soft: #b4b8cc;
    --fg-muted: #767b94;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);

    --brand-1: #818cf8;
    --brand-2: #c084fc;
    --brand-3: #f472b6;
    --gradient-soft: linear-gradient(135deg, rgba(129,140,248,.16), rgba(192,132,252,.16) 50%, rgba(244,114,182,.16));

    --accent: #818cf8;

    --shadow-sm: 0 1px 2px rgba(0,0,0,.3), 0 2px 8px rgba(0,0,0,.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.3);
    --shadow-lg: 0 8px 24px rgba(0,0,0,.5), 0 24px 64px rgba(0,0,0,.4);
    --shadow-glow: 0 8px 40px rgba(129, 140, 248, .25);
  }
}

/* ---------- 基础重置 ---------- */

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* 后台可关闭动画（no-animations 由 site-config.js 按配置挂在 html 上） */
.no-animations *,
.no-animations *::before,
.no-animations *::after {
  animation-duration: .001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: .001ms !important;
  scroll-behavior: auto !important;
}

/* 关闭动画时，进场元素必须直接可见，否则会永久隐藏 */
.no-animations .reveal {
  opacity: 1 !important;
  transform: none !important;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 背景光晕装饰 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 12% -5%, rgba(99,102,241,.10), transparent 70%),
    radial-gradient(700px 500px at 88% 8%, rgba(236,72,153,.09), transparent 70%),
    radial-gradient(500px 400px at 50% 100%, rgba(168,85,247,.07), transparent 70%);
  pointer-events: none;
}

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

a { color: var(--accent); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-2); }

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: rgba(99,102,241,.25); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
  border: 3px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-muted); }

/* ---------- 布局 ---------- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow { max-width: 760px; }

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.site-header.scrolled { border-bottom-color: var(--border); }

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.logo:hover { color: var(--fg); }

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: .95rem;
  box-shadow: var(--shadow-glow);
  flex-shrink: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  color: var(--fg-soft);
  font-size: .93rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  transition: all .2s var(--ease);
  white-space: nowrap;
}

.nav a:hover {
  color: var(--fg);
  background: var(--bg-soft);
}

.nav a.active {
  color: var(--accent);
  background: var(--gradient-soft);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  cursor: pointer;
  place-items: center;
  color: var(--fg);
}

@media (max-width: 640px) {
  .nav-toggle { display: grid; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 24px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: all .25s var(--ease);
  }
  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav a { padding: 12px 16px; }
}

/* ---------- 通用组件 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: .93rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .22s var(--ease);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.4;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow-glow);
  background-size: 200% 200%;
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(99,102,241,.42);
  background-position: 100% 50%;
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: var(--bg-elevated);
  color: var(--fg-soft);
  border-color: var(--border-strong);
}
.btn-ghost:hover {
  color: var(--fg);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 35%, transparent);
}
.btn-danger:hover {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--danger);
}

.btn-sm { padding: 7px 15px; font-size: .85rem; }
.btn-block { width: 100%; }

.btn:disabled {
  opacity: .55;
  cursor: not-allowed;
  transform: none !important;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: all .3s var(--ease-out);
}

.card-hover:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  box-shadow: var(--shadow-md);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--gradient-soft);
  color: var(--accent);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .01em;
  border: 1px solid transparent;
  transition: all .2s var(--ease);
  white-space: nowrap;
}

a.tag:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transform: translateY(-1px);
  color: var(--accent);
}

.tag.active {
  background: var(--gradient);
  color: #fff;
}

/* ---------- Hero ---------- */

.hero {
  padding: 84px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  font-size: .82rem;
  font-weight: 600;
  color: var(--fg-soft);
  margin-bottom: 26px;
  box-shadow: var(--shadow-sm);
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 22%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .6; transform: scale(.88); }
}

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
  font-weight: 800;
  margin: 0 0 22px;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% 200%;
  animation: gradient-shift 8s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero p.lead {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  color: var(--fg-soft);
  max-width: 600px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  margin-top: 56px;
  flex-wrap: wrap;
}

.hero-stat { text-align: center; }

.hero-stat .num {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.hero-stat .label {
  font-size: .82rem;
  color: var(--fg-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* ---------- 区块标题 ---------- */

.section { padding: 56px 0; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--gradient);
  flex-shrink: 0;
}

.section-sub {
  color: var(--fg-muted);
  font-size: .92rem;
  margin: 6px 0 0 16px;
}

/* ---------- 文章卡片 ---------- */

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
}

.post-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: all .3s var(--ease-out);
  position: relative;
  overflow: hidden;
  height: 100%;
}

.post-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity .3s var(--ease);
}

.post-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
  box-shadow: var(--shadow-md);
}

.post-card:hover::after { opacity: 1; }

.post-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.015em;
  margin: 0 0 10px;
}

.post-card h3 a { color: var(--fg); }
.post-card h3 a:hover { color: var(--accent); }

.post-card .excerpt {
  color: var(--fg-soft);
  font-size: .92rem;
  line-height: 1.65;
  margin: 0 0 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .8rem;
  color: var(--fg-muted);
  flex-wrap: wrap;
}

.post-meta .sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: .5;
}

.post-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 16px;
}

/* 草稿标记 */
.badge-draft {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--warning) 16%, transparent);
  color: var(--warning);
  font-size: .72rem;
  font-weight: 700;
}

/* ---------- 文章详情 ---------- */

.article-header {
  padding: 64px 0 32px;
  text-align: center;
}

.article-header h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin: 0 0 20px;
}

.article-header .post-meta { justify-content: center; }

.article-body {
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--fg-soft);
  padding-bottom: 60px;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin: 2.2em 0 .7em;
  padding-bottom: .35em;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.16rem;
  font-weight: 700;
  color: var(--fg);
  margin: 1.8em 0 .6em;
  scroll-margin-top: 90px;
}

.article-body p { margin: 0 0 1.25em; }

.article-body ul, .article-body ol {
  margin: 0 0 1.25em;
  padding-left: 1.5em;
}
.article-body li { margin-bottom: .5em; }
.article-body li::marker { color: var(--accent); }

.article-body a {
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 3px;
}
.article-body a:hover { text-decoration-color: var(--accent); }

.article-body code {
  font-family: var(--font-mono);
  font-size: .87em;
  background: var(--bg-soft);
  padding: .2em .45em;
  border-radius: 6px;
  color: var(--brand-3);
  word-break: break-word;
}

.article-body pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 1.4em;
  line-height: 1.65;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: var(--fg);
  font-size: .85rem;
}

.article-body blockquote {
  margin: 0 0 1.4em;
  padding: 14px 22px;
  border-left: 3px solid var(--accent);
  background: var(--gradient-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--fg-soft);
}
.article-body blockquote p:last-child { margin-bottom: 0; }

.article-body img {
  border-radius: var(--radius-sm);
  margin: 1.4em 0;
  border: 1px solid var(--border);
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.5em;
  font-size: .92rem;
  display: block;
  overflow-x: auto;
}
.article-body th, .article-body td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
.article-body th {
  background: var(--bg-soft);
  font-weight: 700;
  color: var(--fg);
}

/* ---------- 标签筛选栏 ---------- */

.tag-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

/* ---------- 空状态 ---------- */

.empty {
  text-align: center;
  padding: 72px 24px;
  color: var(--fg-muted);
}

.empty-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  border-radius: var(--radius);
  background: var(--gradient-soft);
  display: grid;
  place-items: center;
  font-size: 1.6rem;
}

.empty h3 {
  color: var(--fg);
  font-size: 1.1rem;
  margin: 0 0 8px;
  font-weight: 700;
}

.empty p { margin: 0; font-size: .92rem; }

/* ---------- 骨架屏 ---------- */

.skeleton {
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--border) 50%, var(--bg-soft) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-card { height: 210px; border-radius: var(--radius); }

/* ---------- 表单 ---------- */

.field { margin-bottom: 18px; }

.field label {
  display: block;
  font-size: .87rem;
  font-weight: 600;
  color: var(--fg-soft);
  margin-bottom: 7px;
}

.input, .textarea {
  width: 100%;
  padding: 11px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg);
  color: var(--fg);
  font-size: .94rem;
  transition: all .2s var(--ease);
}

.input:focus, .textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

.textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.65;
}

.textarea-lg { min-height: 340px; font-family: var(--font-mono); font-size: .88rem; }

.field-hint {
  font-size: .8rem;
  color: var(--fg-muted);
  margin-top: 6px;
}

/* ---------- 提示条 ---------- */

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: .89rem;
  font-weight: 500;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slide-down .3s var(--ease-out);
}

@keyframes slide-down {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.alert-error {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 28%, transparent);
}

.alert-success {
  background: color-mix(in srgb, var(--success) 12%, transparent);
  color: var(--success);
  border: 1px solid color-mix(in srgb, var(--success) 28%, transparent);
}

.alert-info {
  background: var(--gradient-soft);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}

/* ---------- 登录页 ---------- */

.auth-wrap {
  min-height: calc(100vh - var(--header-h));
  display: grid;
  place-items: center;
  padding: 48px 24px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  box-shadow: var(--shadow-lg);
}

.auth-card .logo-mark {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  font-size: 1.3rem;
  margin: 0 auto 20px;
}

.auth-card h1 {
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}

.auth-card .sub {
  text-align: center;
  color: var(--fg-muted);
  font-size: .88rem;
  margin: 0 0 28px;
}

/* ---------- 后台 ---------- */

.admin-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

.admin-user {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
  color: var(--fg-soft);
}

.avatar-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: .85rem;
  flex-shrink: 0;
}

.admin-list { display: flex; flex-direction: column; gap: 12px; }

.admin-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all .2s var(--ease);
}

.admin-item:hover {
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}

.admin-item .info { flex-grow: 1; min-width: 0; }

.admin-item .info h4 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.admin-item .actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ---------- 编辑器 ---------- */

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  align-items: start;
}

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

.preview-pane {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  max-height: 620px;
  overflow-y: auto;
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.preview-pane .label {
  font-size: .78rem;
  font-weight: 700;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 16px;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 72px;
  padding: 40px 0;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: .87rem;
  color: var(--fg-muted);
}

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--fg-muted); }
.footer-links a:hover { color: var(--accent); }

/* ---------- 工具类 ---------- */

.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- 进场动画 ---------- */

.fade-in {
  animation: fade-in .6s var(--ease-out) both;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in-delay-1 { animation-delay: .08s; }
.fade-in-delay-2 { animation-delay: .16s; }
.fade-in-delay-3 { animation-delay: .24s; }

/* 滚动进场 */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease-out), transform .6s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 打印 ---------- */

@media print {
  .site-header, .site-footer, .hero-actions, .nav-toggle { display: none; }
  body { background: #fff; color: #000; }
  .article-body { color: #000; }
}