/* =====================================================================
   自托管 OFL 字体（latin 可变字体，CJK 自动回退 PingFang/雅黑）
   Inter（SIL OFL 1.1）替代 Inter Variable；JetBrains Mono（OFL）替代 Berkeley Mono
   ===================================================================== */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../fonts/inter-latin-var.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../fonts/jetbrainsmono-latin-var.woff2') format('woff2');
}

/* =====================================================================
   设计令牌 · 来源：Linear UI 设计知识文档（plan/ui-knowledge）
   dark-first：以下为 Linear 原值（§3 设计令牌 / §9 照做清单）
   字体替代：Inter（OFL）≈ Inter Variable；JetBrains Mono（OFL）≈ Berkeley Mono
   ===================================================================== */
:root {
  /* —— 颜色：近黑分层背景（§3.1） —— */
  --color-bg: #08090a;             /* level-0 页面底 */
  --color-bg-1: #0f1011;           /* level-1 */
  --color-surface: #141516;        /* level-2 卡片底 */
  --color-surface-2: #191a1b;      /* level-3 */
  --color-text: #f7f8f8;           /* 主文字 ≈17:1 */
  --color-text-2: #d0d6e0;         /* 次文字 ≈13:1 */
  --color-text-3: #8a8f98;         /* 弱文字 ≈5.6:1 */
  --color-text-4: #62666d;         /* 最弱占位 */
  --color-border: #23252a;         /* 发丝边框 primary */
  --color-border-2: #34343a;       /* secondary */
  --color-border-hi: rgba(255, 255, 255, .12);  /* hover 提亮 #ffffff1f */
  --color-primary: #5e6ad2;        /* 品牌靛蓝 */
  --color-primary-hi: #828fff;     /* accent-hover / 链接高亮 */
  --color-accent: #7170ff;         /* 强调紫 */
  --color-success: #27a644;
  --color-warning: #f0bf00;
  --color-danger: #eb5757;
  --color-info: #4ea7fc;
  --color-invert-bg: #e5e5e6;      /* 反白胶囊底 */
  --color-invert-bg-hi: #ffffff;
  --color-invert-text: #08090a;
  --color-overlay: rgba(0, 0, 0, .85);
  --color-hairline: rgba(255, 255, 255, .08);   /* #ffffff0d 半透发丝 */

  /* —— 字体（§3.2） —— */
  --font-sans: 'Inter', 'Inter Variable', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --weight-normal: 400;
  --weight-medium: 510;   /* Linear 非整百字重 */
  --weight-semibold: 590;
  --weight-bold: 680;

  /* —— 字号（§3.2，正文一律轻负字距） —— */
  --text-tiny: 10px;
  --text-micro: 12px;
  --text-mini: 13px;
  --text-small: 14px;
  --text-regular: 15px;
  --text-large: 17px;
  --text-title3: 20px;
  --text-title2: 24px;
  --text-title1: clamp(32px, 6vw, 48px);  /* 桌面大标题，≤640 降档 */

  /* —— 间距：8px 基准（§3.3） —— */
  --space-1: 4px;
  --space-2: 6px;
  --space-3: 8px;
  --space-4: 12px;
  --space-5: 16px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 48px;
  --space-9: 64px;
  --space-10: 96px;
  --space-11: 120px;

  /* —— 圆角：4/6/8/12/16 + 胶囊（§3.4） —— */
  --radius-1: 4px;
  --radius-2: 6px;
  --radius-3: 8px;
  --radius-4: 12px;   /* 卡片/浮层 */
  --radius-5: 16px;
  --radius-pill: 9999px;

  /* —— 阴影：暗色界面弱化投影，靠边框/背景分层（§3.4） —— */
  --shadow-low: 0 1px rgba(0, 0, 0, .4);
  --shadow-md: 0 4px 32px rgba(8, 9, 10, .6);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, .5);   /* 延伸：toast 等 */
  --shadow-focus: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-primary);

  /* —— 动效（§3.6） —— */
  --dur-fast: .12s;
  --dur-base: .16s;
  --dur-slow: .18s;
  --dur-reveal: .5s;
  --ease-out: cubic-bezier(.25, .46, .45, .94);
  --ease-reveal: cubic-bezier(.32, .72, 0, 1);

  /* —— 布局/层级 —— */
  --container-width: 1200px;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-modal: 1000;
  --z-toast: 1100;

  color-scheme: dark;

  /* ===== 兼容别名：迁移期供未改版页面继续取色，全站迁移完成后移除 ===== */
  --c-bg: var(--color-bg);
  --c-bg-2: var(--color-bg-1);
  --c-card: var(--color-surface);
  --c-border: var(--color-border);
  --c-border-strong: var(--color-border-2);
  --c-text: var(--color-text);
  --c-text-dim: var(--color-text-2);
  --c-text-mute: var(--color-text-3);
  --c-primary: var(--color-primary);
  --c-primary-soft: rgba(94, 106, 210, .14);
  --c-primary-glow: rgba(94, 106, 210, .25);
  --c-accent: var(--color-accent);
  --c-accent-soft: rgba(113, 112, 255, .12);
  --c-accent-glow: rgba(113, 112, 255, .18);
  --c-success: var(--color-success);
  --c-danger: var(--color-danger);
  --c-warning: var(--color-warning);
  --radius: var(--radius-4);
  --radius-sm: var(--radius-3);
  --sans: var(--font-sans);
  --mono: var(--font-mono);
  --max-w: var(--container-width);
  --shadow-sm: var(--shadow-low);
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;                 /* Linear large/regular 行高 1.6 */
  letter-spacing: -.011em;          /* §3.2 正文负字距 */
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary-hi); text-decoration: none; transition: color var(--dur-base) var(--ease-out); }
a:hover { color: var(--color-text); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }
::selection { background: var(--color-primary); color: #fff; }

/* 键盘焦点：Linear 双层靛蓝环（§6） */
a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-2);
}

/* ===== 滚动条（§6 细半透明） ===== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .1); border-radius: var(--radius-pill); border: 2px solid var(--color-bg); }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, .2); }
::-webkit-scrollbar-thumb:active { background: rgba(255, 255, 255, .4); }

/* ===== 导航（Linear Header：透明吸顶 → 毛玻璃 + 发丝线） ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: var(--z-sticky);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--space-7); height: 56px;
  background: transparent;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background var(--dur-slow) var(--ease-out), border-color var(--dur-slow) var(--ease-out);
}
.nav.scrolled {
  background: rgba(8, 9, 10, .72);
  border-bottom-color: var(--color-hairline);
}
.nav-logo { font-family: var(--mono); font-size: var(--text-regular); font-weight: var(--weight-semibold); letter-spacing: -.01em; color: var(--color-text); }
.nav-logo span { color: var(--color-primary-hi); }
.nav-links { display: flex; gap: var(--space-1); align-items: center; }
.nav-links a {
  padding: 6px 12px; font-size: var(--text-small); color: var(--color-text-3);
  border-radius: var(--radius-2); transition: color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
  font-weight: var(--weight-medium);
}
.nav-links a:hover { color: var(--color-text); background: rgba(255, 255, 255, .06); }
.nav-links a.active { color: var(--color-text); }
.nav-user { display: flex; align-items: center; gap: var(--space-3); }
.nav-user img, .nav-user .avatar-ph {
  width: 28px; height: 28px; border-radius: var(--radius-pill); object-fit: cover;
  background: var(--color-primary); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: var(--weight-semibold); font-size: var(--text-small);
}
.nav-menu-btn { display: none; flex-direction: column; gap: 4px; padding: var(--space-3); }
.nav-menu-btn span { width: 18px; height: 1.5px; background: var(--color-text-2); border-radius: 1px; }

/* ===== 按钮（§5：反白胶囊主按钮 / 发丝幽灵 / 文字箭头） ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3);
  padding: 9px 18px; border-radius: var(--radius-pill); font-size: var(--text-mini); font-weight: var(--weight-medium);
  transition: background var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
  white-space: nowrap; border: 1px solid transparent; line-height: 1;
}
.btn-primary { background: var(--color-invert-bg); color: var(--color-invert-text); }
.btn-primary:hover { background: var(--color-invert-bg-hi); color: var(--color-invert-text); box-shadow: 0 0 24px rgba(229, 229, 230, .12); transform: translateY(-1px); }
.btn-outline { border-color: var(--color-border-hi); color: var(--color-text-2); background: transparent; }
.btn-outline:hover { border-color: rgba(255, 255, 255, .28); color: var(--color-text); }
.btn-ghost { color: var(--color-text-3); }
.btn-ghost:hover { color: var(--color-text); background: rgba(255, 255, 255, .06); }
.btn-sm { padding: 6px 12px; font-size: var(--text-micro); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
/* 文字箭头链接（Hero/段落 Learn more → 模式） */
.btn-text { color: var(--color-primary-hi); font-size: var(--text-small); font-weight: var(--weight-medium); padding: 9px 4px; }
.btn-text:hover { color: var(--color-text); }
.btn-text::after { content: '→'; margin-left: 6px; transition: transform var(--dur-base) var(--ease-out); }
.btn-text:hover::after { transform: translateX(3px); }

/* ===== Hero（近纯黑大标题 + 点阵呼吸背景，§4/§3.6） ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; padding: 96px 32px 72px;
  position: relative; overflow: hidden;
  background: var(--color-bg);
}
/* 点阵：黑底微光，径向遮罩淡出 */
.dot-grid {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, .07) 1px, transparent 0);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 42%, black 30%, transparent 78%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 42%, black 30%, transparent 78%);
  animation: dotBreathe 2800ms steps(1, end) infinite;
}
@keyframes dotBreathe { 0%, 100% { opacity: .55; } 50% { opacity: 1; } }
.hero-inner { position: relative; z-index: 1; max-width: var(--container-width); margin: 0 auto; width: 100%; display: flex; gap: 72px; align-items: center; flex-wrap: wrap; }
.hero-text { flex: 1; min-width: 320px; }
.hero-greet { font-family: var(--mono); color: var(--color-text-3); font-size: var(--text-mini); margin-bottom: var(--space-6); letter-spacing: .02em; font-weight: var(--weight-normal); }
.hero-greet::before { content: '$ '; color: var(--color-primary); }
.hero-name {
  font-size: var(--text-title1); font-weight: var(--weight-medium); line-height: 1.1;
  margin-bottom: var(--space-6); letter-spacing: -.022em; color: var(--color-text);
}
.hero-name.split-text .split-char,
.hero-name .accent { color: var(--color-text); -webkit-text-fill-color: currentColor; background: none; }
.hero-bio { font-size: var(--text-large); color: var(--color-text-2); margin-bottom: var(--space-7); max-width: 540px; line-height: 1.6; }
.hero-bio strong { color: var(--color-text); font-weight: var(--weight-semibold); }
.hero-bio em { color: var(--color-primary-hi); font-style: normal; }
.hero-actions { display: flex; gap: var(--space-5); flex-wrap: wrap; align-items: center; }
.hero-stats { display: flex; gap: var(--space-8); margin-top: var(--space-9); padding-top: var(--space-6); border-top: 1px solid var(--color-hairline); }
.hero-stat .num { font-family: var(--mono); font-size: var(--text-title2); font-weight: var(--weight-semibold); color: var(--color-text); font-variant-numeric: tabular-nums; }
.hero-stat .label { font-size: var(--text-tiny); color: var(--color-text-3); text-transform: uppercase; letter-spacing: .14em; margin-top: 2px; }

/* 终端 mock —— 对应 Linear「首屏真实产品截图」的角色（延伸设计：开发者身份证据）
   固定深色面板：浅色主题下也保持"暗色代码截图"惯例（同 Stripe 文档页深色代码块） */
.hero-visual { flex: 0 0 420px; max-width: 420px; position: relative; width: 100%; }
.terminal {
  background: #0f1011;
  border-radius: var(--radius-4);
  box-shadow: inset 0 0 0 1px #23252a, 0 4px 40px rgba(0, 0, 0, .35);
  overflow: hidden;
  transform: perspective(1400px) rotateY(-6deg) rotateX(2deg);
  transition: transform var(--dur-reveal) var(--ease-reveal);
}
.hero-visual:hover .terminal { transform: perspective(1400px) rotateY(-2deg) rotateX(0deg); }
.terminal-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .02);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.terminal-bar .tdot { width: 10px; height: 10px; border-radius: 50%; background: #34343a; }
.terminal-bar .tdot:nth-child(1) { background: #eb5757; }
.terminal-bar .tdot:nth-child(2) { background: #f0bf00; }
.terminal-bar .tdot:nth-child(3) { background: #27a644; }
.terminal-title { margin-left: 8px; font-family: var(--font-mono); font-size: var(--text-tiny); color: #62666d; }
.terminal-body { padding: 18px 18px 20px; font-family: var(--font-mono); font-size: var(--text-small); line-height: 1.9; color: #d0d6e0; }
.terminal-body p { margin: 0; }
.t-prompt { color: #828fff; margin-right: 8px; }
.t-out { color: #8a8f98; padding-left: 16px; margin-bottom: 10px; }
.t-kw { color: #4ea7fc; }
.t-ok { color: #27a644; }
.t-caret { color: #828fff; animation: caretBlink 1.2s step-end infinite; }
@keyframes caretBlink { 50% { opacity: 0; } }

/* ===== 技术栈字标墙（对应 Linear Logo 墙，§5） ===== */
.stack-wall { padding: var(--space-9) 32px; text-align: center; border-top: 1px solid var(--color-hairline); }
.stack-caption {
  font-size: var(--text-tiny); color: var(--color-text-4);
  text-transform: uppercase; letter-spacing: .18em; margin-bottom: var(--space-6);
}
.stack-logos { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-7) var(--space-9); }
.stack-logos span {
  font-family: var(--mono); font-size: var(--text-large); font-weight: var(--weight-medium);
  color: var(--color-text-4); letter-spacing: -.01em;
  transition: color var(--dur-base) var(--ease-out);
}
.stack-logos span:hover { color: var(--color-text-2); }

/* ===== Section（§4：靠近黑背景 + 大留白分隔，不用强分割线） ===== */
.section { padding: var(--space-10) 32px; }
.section-inner { max-width: var(--container-width); margin: 0 auto; }
.section-head { display: flex; align-items: baseline; gap: var(--space-4); margin-bottom: var(--space-8); }
.section-num { font-family: var(--mono); font-size: var(--text-micro); color: var(--color-primary-hi); font-weight: var(--weight-normal); letter-spacing: .14em; text-transform: uppercase; }
.section-title { font-size: var(--text-title2); font-weight: var(--weight-medium); color: var(--color-text); letter-spacing: -.015em; }
.section-desc { color: var(--color-text-3); font-size: var(--text-small); margin-left: auto; }
.section-link { color: var(--color-primary-hi); font-size: var(--text-small); font-family: var(--font-sans); font-weight: var(--weight-medium); margin-left: auto; }
.section-link:hover { color: var(--color-text); }
.section-link::after { content: ' →'; }

/* ===== 文章卡片（Linear 特性卡：#141516 底 + 发丝描边，hover 边框提亮） ===== */
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--space-4); }
.post-card {
  background: var(--color-surface);
  box-shadow: inset 0 0 0 1px var(--color-hairline);
  border: none; border-top: none;
  border-radius: var(--radius-4);
  overflow: hidden; transition: box-shadow var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
  cursor: pointer; position: relative;
}
.post-card:hover { box-shadow: inset 0 0 0 1px var(--color-border-hi), var(--shadow-md); transform: translateY(-2px); }
.post-cover { aspect-ratio: 16/9; background: var(--color-bg-1); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.post-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-reveal) var(--ease-out); opacity: .92; }
.post-card:hover .post-cover img { transform: scale(1.04); opacity: 1; }
.post-cover .ph { font-size: var(--text-title2); color: var(--color-text-4); font-family: var(--mono); font-weight: var(--weight-normal); }
.post-body { padding: var(--space-5); }
.post-body h3 { font-size: var(--text-large); margin-bottom: var(--space-3); line-height: 1.4; color: var(--color-text); font-weight: var(--weight-medium); letter-spacing: -.01em; }
.post-body p { color: var(--color-text-3); font-size: var(--text-small); margin-bottom: var(--space-4); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-meta { display: flex; align-items: center; gap: var(--space-4); font-size: var(--text-micro); color: var(--color-text-4); font-family: var(--mono); }
.post-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: var(--space-4); }
.tag {
  padding: 3px 10px; border-radius: var(--radius-pill); font-size: var(--text-micro); font-family: var(--mono);
  background: rgba(94, 106, 210, .14); color: var(--color-primary-hi); border: 1px solid transparent;
  font-weight: var(--weight-normal);
}

/* ===== 首页「最新文章」参考卡（放大对称 + 文字压图，延伸设计） =====
   参考客户故事卡：大封面、底部渐变压字、对称等宽两列；仅首页使用 */
.section-head-center { flex-direction: column; align-items: center; gap: var(--space-2); text-align: center; margin-bottom: var(--space-9); }
.section-head-center .section-title { font-size: var(--text-title1); }
.post-grid-featured { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.post-card-featured { aspect-ratio: 4 / 3; display: flex; flex-direction: column; justify-content: flex-end; }
.post-card-featured .post-cover { position: absolute; inset: 0; aspect-ratio: auto; }
.post-card-featured .post-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8, 9, 10, 0) 32%, rgba(8, 9, 10, .86) 100%);
}
.post-card-featured .post-body { position: relative; z-index: 1; padding: var(--space-7) var(--space-6) var(--space-6); }
/* 图上文字恒反白（两主题一致，同终端 mock 惯例） */
.post-card-featured .post-body h3 { font-size: var(--text-title3); color: #f7f8f8; }
.post-card-featured .post-body p { color: rgba(255, 255, 255, .75); }
.post-card-featured .post-meta { color: rgba(255, 255, 255, .6); }

/* ===== 表单 ===== */
.form-group { margin-bottom: 18px; }
.form-label { display: block; margin-bottom: 6px; font-size: .82rem; color: var(--c-text-dim); font-family: var(--mono); font-weight: 500; }
.form-input, .form-textarea, .form-select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  background: var(--c-card); color: var(--c-text); transition: border-color .2s, box-shadow .2s;
}
.form-input:focus, .form-textarea:focus, .form-select:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--shadow-focus); }
.form-textarea { min-height: 140px; resize: vertical; }
.form-error { color: var(--c-danger); font-size: .82rem; margin-top: 4px; }
.form-hint { color: var(--c-text-mute); font-size: .78rem; margin-top: 4px; }

/* ===== Auth ===== */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 96px 24px 48px; background: var(--c-bg); }
.auth-card { width: 100%; max-width: 420px; background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-md); }
.auth-card h2 { font-size: 1.5rem; margin-bottom: 6px; color: var(--c-text); letter-spacing: -.01em; }
.auth-card .sub { color: var(--c-text-dim); font-size: .9rem; margin-bottom: 28px; }
.auth-card .switch-link { text-align: center; margin-top: 24px; font-size: .86rem; color: var(--c-text-dim); }
.auth-card .switch-link a { color: var(--c-primary); font-weight: 500; }

/* ===== 详情 ===== */
.detail { padding: 96px 32px 60px; }
.detail-inner { max-width: 720px; margin: 0 auto; }
.detail-back { font-family: var(--mono); font-size: .82rem; color: var(--c-text-dim); margin-bottom: 24px; display: inline-flex; align-items: center; gap: 6px; }
.detail-back:hover { color: var(--c-primary); }
.detail h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); margin-bottom: 16px; line-height: 1.3; color: var(--c-text); letter-spacing: -.01em; }
.detail-meta { display: flex; gap: 16px; flex-wrap: wrap; color: var(--c-text-mute); font-size: .82rem; font-family: var(--mono); margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--c-border); }
.detail-content { font-size: 1rem; line-height: 1.85; color: var(--c-text); }
.detail-content h2 { font-size: 1.4rem; margin: 1.6em 0 .6em; padding-bottom: 8px; border-bottom: 1px solid var(--c-border); }
.detail-content h3 { font-size: 1.15rem; margin: 1.3em 0 .4em; }
.detail-content p { margin-bottom: 1em; }
.detail-content ul, .detail-content ol { margin: 1em 0; padding-left: 1.5em; }
.detail-content li { margin-bottom: .3em; }
.detail-content img { border-radius: var(--radius-sm); margin: 1em 0; }
.detail-content code { font-family: var(--mono); background: var(--c-bg-2); padding: 2px 6px; border-radius: 4px; font-size: .85em; color: var(--c-primary); }
.detail-content pre { background: var(--c-bg-2); border: 1px solid var(--c-border); border-radius: var(--radius-sm); padding: 16px; overflow-x: auto; margin: 1em 0; }
.detail-content pre code { background: none; padding: 0; color: var(--c-text); }
.detail-content blockquote { border-left: 3px solid var(--c-primary); padding: 4px 0 4px 16px; color: var(--c-text-dim); margin: 1em 0; background: var(--c-primary-soft); border-radius: 0 6px 6px 0; }
.detail-content table { width: 100%; border-collapse: collapse; margin: 1em 0; }
.detail-content th, .detail-content td { padding: 8px 12px; border: 1px solid var(--c-border); }
.detail-content th { background: var(--c-bg-2); }

/* ===== 互动 ===== */
.interactions { display: flex; gap: 12px; margin: 32px 0; padding: 20px 0; border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); }
.interactions button { display: flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 20px; border: 1px solid var(--c-border); color: var(--c-text-dim); transition: all .2s; font-size: .85rem; background: var(--c-card); }
.interactions button:hover { border-color: var(--c-primary); color: var(--c-primary); }
.interactions button.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ===== 评论 ===== */
.comments { margin-top: 40px; }
.comments h3 { font-size: 1.1rem; margin-bottom: 20px; color: var(--c-text); }
.comment-item { display: flex; gap: 12px; padding: 16px 0; border-bottom: 1px solid var(--c-border); }
.comment-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--c-primary); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 600; flex-shrink: 0; font-size: .85rem; overflow: hidden; }
.comment-avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.comment-body { flex: 1; }
.comment-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.comment-meta .author { font-weight: 600; font-size: .9rem; color: var(--c-text); }
.comment-meta .time { color: var(--c-text-mute); font-size: .78rem; font-family: var(--mono); }
.comment-content { color: var(--c-text); font-size: .92rem; }
.comment-actions { margin-top: 6px; display: flex; gap: 12px; }
.comment-actions button { font-size: .78rem; color: var(--c-text-mute); }
.comment-actions button:hover { color: var(--c-danger); }

/* ===== About ===== */
.about { padding: 96px 32px 60px; }
.about-inner { max-width: 720px; margin: 0 auto; }
.about h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); margin-bottom: 12px; color: var(--c-text); letter-spacing: -.01em; }
.about-role { color: var(--c-primary); font-family: var(--mono); font-size: .92rem; margin-bottom: 32px; padding-bottom: 16px; border-bottom: 1px solid var(--c-border); }
.about-content p { margin-bottom: 1em; color: var(--c-text-dim); line-height: 1.8; }
.about-content strong { color: var(--c-text); font-weight: 600; }
.about-skills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--c-border); }
.about-skills .tag { font-size: .8rem; padding: 6px 14px; }

/* ===== Contact ===== */
.contact { padding: 96px 32px 60px; }
.contact-inner { max-width: 600px; margin: 0 auto; }
.contact h1 { font-size: clamp(1.6rem, 4vw, 2rem); margin-bottom: 8px; color: var(--c-text); letter-spacing: -.01em; }
.contact .sub { color: var(--c-text-dim); margin-bottom: 32px; font-size: .92rem; }

/* ===== Admin ===== */
.admin { padding: 96px 32px 40px; }
.admin-inner { max-width: 1100px; margin: 0 auto; }
.admin h1 { font-size: 1.5rem; margin-bottom: 24px; color: var(--c-text); letter-spacing: -.01em; }
.admin-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--c-border); margin-bottom: 24px; }
.admin-tabs button { padding: 10px 20px; color: var(--c-text-dim); border-bottom: 2px solid transparent; transition: all .2s; font-size: .88rem; font-weight: 500; margin-bottom: -1px; }
.admin-tabs button:hover { color: var(--c-text); }
.admin-tabs button.active { color: var(--c-primary); border-color: var(--c-primary); }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--c-border); font-size: .86rem; }
.admin-table th { color: var(--c-text-mute); font-family: var(--mono); text-transform: uppercase; letter-spacing: .5px; font-size: .72rem; background: var(--c-bg-2); }
.admin-table tr:hover { background: var(--c-bg-2); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.stat-card .num { font-family: var(--mono); font-size: 1.7rem; font-weight: 700; color: var(--c-primary); }
.stat-card .lbl { color: var(--c-text-mute); font-size: .78rem; margin-top: 4px; }
.switch { position: relative; width: 40px; height: 22px; border-radius: 11px; background: var(--c-border-strong); cursor: pointer; transition: background .2s; }
.switch::after { content: ''; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%; background: #fff; transition: transform .2s; box-shadow: 0 1px 3px rgba(0,0,0,.2); }
.switch.on { background: var(--c-success); }
.switch.on::after { transform: translateX(18px); }

/* ===== Profile ===== */
.profile { padding: 96px 32px 40px; }
.profile-inner { max-width: 640px; margin: 0 auto; }
.profile h1 { font-size: 1.4rem; margin-bottom: 24px; color: var(--c-text); letter-spacing: -.01em; }
.profile-section { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; box-shadow: var(--shadow-sm); }
.profile-section h2 { font-size: 1rem; margin-bottom: 16px; color: var(--c-text-dim); font-family: var(--mono); font-weight: 600; }

/* ===== Toast ===== */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 9999; padding: 12px 22px; border-radius: var(--radius-sm); background: var(--c-card); border: 1px solid var(--c-border); font-size: .88rem; box-shadow: var(--shadow-lg); animation: toastIn .25s ease; }
.toast.success { border-color: var(--c-success); color: var(--c-success); }
.toast.error { border-color: var(--c-danger); color: var(--c-danger); }
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 16px); } }

/* ===== 空/分页 ===== */
.empty { text-align: center; padding: 60px 24px; color: var(--c-text-mute); }
.empty .icon { font-size: 2.5rem; margin-bottom: 12px; font-family: var(--mono); }
.empty p { color: var(--c-text-mute); }
.pager { display: flex; gap: 6px; justify-content: center; margin-top: 32px; }
.pager button { padding: 8px 16px; border-radius: var(--radius-sm); border: 1px solid var(--c-border); color: var(--c-text-dim); transition: all .2s; font-size: .85rem; background: var(--c-card); }
.pager button:hover, .pager button.active { border-color: var(--c-primary); color: var(--c-primary); }
.pager button:disabled { opacity: .4; cursor: not-allowed; }

/* ===== 滑块验证 ===== */
.captcha-box { position: relative; margin-bottom: 18px; }
.captcha-track { position: relative; height: 44px; border-radius: var(--radius-sm); background: var(--c-bg-2); border: 1px solid var(--c-border); overflow: hidden; }
.captcha-progress { position: absolute; top: 0; left: 0; height: 100%; width: 0; background: var(--c-primary); opacity: .15; transition: background .2s; }
.captcha-hint { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--c-text-mute); font-size: .82rem; user-select: none; pointer-events: none; }
.captcha-slider { position: absolute; top: 0; left: 0; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; cursor: grab; background: var(--c-card); border-right: 1px solid var(--c-border); color: var(--c-text-dim); border-radius: var(--radius-sm) 0 0 var(--radius-sm); transition: color .2s; z-index: 2; box-shadow: var(--shadow-sm); }
.captcha-slider.dragging { cursor: grabbing; color: var(--c-primary); }
.captcha-box.passed .captcha-slider { cursor: default; color: var(--c-success); background: var(--c-success); }
.captcha-box.passed .captcha-slider::before { content: '✓'; color: #fff; font-weight: 700; }
.captcha-refresh { position: absolute; top: 50%; right: 8px; transform: translateY(-50%); width: 22px; height: 22px; display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--c-text-mute); opacity: .5; transition: opacity .2s; z-index: 3; }
.captcha-refresh:hover { opacity: 1; color: var(--c-primary); }

/* ===== Footer（深色 + 发丝顶边） ===== */
.footer { border-top: 1px solid var(--color-hairline); padding: var(--space-6) 32px; text-align: center; color: var(--color-text-4); font-size: var(--text-micro); font-family: var(--mono); background: var(--color-bg); }

/* ===== 404 ===== */
.not-found { min-height: 100vh; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 20px; text-align: center; padding: 80px 24px; }
.not-found h1 { font-size: 6rem; font-weight: 800; font-family: var(--mono); color: var(--c-primary); letter-spacing: -.04em; line-height: 1; }
.not-found p { color: var(--c-text-dim); }
.not-found-code {
  font-size: clamp(5rem, 20vw, 8rem);
  font-weight: 800;
  font-family: var(--mono);
  color: var(--c-primary);
  line-height: 1;
  letter-spacing: -.04em;
  margin-bottom: 16px;
}

/* ===== 逐字飞入动画（Split Text · Linear 滚动揭示：.5s / 48px / ease-reveal） ===== */
.split-text .split-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(48px);
  will-change: opacity, transform;
}
.split-text.split-visible .split-char {
  animation-name: splitTextIn;
  animation-duration: var(--dur-reveal);
  animation-fill-mode: both;
  animation-timing-function: var(--ease-reveal);
}
@keyframes splitTextIn {
  from { opacity: 0; transform: translateY(48px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Decrypt Text 解密文字光标 ===== */
.decrypt-text.decrypting::after {
  content: '▍';
  margin-left: 2px;
  color: var(--color-primary-hi);
  animation: caret-blink .7s steps(1) infinite;
}
.decrypt-text.decrypt-done::after { content: ''; }
@keyframes caret-blink { 50% { opacity: 0; } }

/* ===== 卡片 3D 倾斜 + 光泽（暗色下弱化为边缘高光） ===== */
.post-card.card-tilt { will-change: transform; }
.post-card.card-tilt::after {
  content: '';
  position: absolute; inset: 0; z-index: 2;
  pointer-events: none;
  background: radial-gradient(circle at var(--gx, 50%) var(--gy, 50%), rgba(255,255,255,.06), transparent 45%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.post-card.card-tilt:hover::after { opacity: 1; }

/* ===== 响应式（Linear 断点：≤768 栅格收敛，≤640 导航折叠） ===== */
@media (max-width: 768px) {
  .nav { padding: 0 16px; height: 56px; }
  .nav-links { display: none; }
  .nav-links.mobile { display: flex; flex-direction: column; position: fixed; top: 56px; left: 0; right: 0; background: rgba(15, 16, 17, .96); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); padding: var(--space-4); border-bottom: 1px solid var(--color-hairline); gap: var(--space-1); box-shadow: var(--shadow-md); z-index: var(--z-dropdown); }
  .nav-links.mobile a { padding: 12px 14px; font-size: var(--text-regular); }
  .nav-menu-btn { display: flex; }
  .hero { padding: 80px 20px 48px; }
  .hero-inner { flex-direction: column; gap: var(--space-8); }
  .hero-visual { flex: none; max-width: 340px; width: 100%; }
  .terminal { transform: none; }
  .hero-visual:hover .terminal { transform: none; }
  .hero-stats { gap: var(--space-6); flex-wrap: wrap; }
  .section { padding: var(--space-9) 20px; }
  .stack-wall { padding: var(--space-8) 20px; }
  .post-grid, .post-grid-featured { grid-template-columns: 1fr; }
  .post-card-featured { aspect-ratio: auto; min-height: 320px; }
  .auth-card { padding: 28px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .admin-table { font-size: .78rem; }
  .admin-table th, .admin-table td { padding: 8px 10px; }
  .detail, .about, .contact, .profile { padding: 80px 20px 40px; }
  .section-head { flex-wrap: wrap; }
  .section-desc, .section-link { margin-left: 0; }
}

/* 触屏设备：弱化 hover 动效（Linear any-hover 实践） */
@media (hover: none) {
  .post-card:hover { transform: none; }
  .terminal, .hero-visual:hover .terminal { transform: none; }
}

/* 减少动效偏好（§8 无障碍） */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .dot-grid { animation: none; }
  .split-text .split-char { opacity: 1; transform: none; }
}

/* ===== 文章详情页 ===== */
.article { max-width: 760px; margin: 0 auto; padding: 80px 20px 60px; }
.article-header { margin-bottom: 40px; padding-bottom: 28px; border-bottom: 1px solid var(--c-border); }
.article-meta { display: flex; gap: 10px; color: var(--c-text-mute); font-size: .85rem; margin-bottom: 14px; flex-wrap: wrap; }
.article-header h1 { font-size: 2rem; line-height: 1.35; margin-bottom: 12px; color: var(--c-text); }
.article-summary { color: var(--c-text-dim); font-size: 1.05rem; line-height: 1.7; }

.article-body { font-size: 1.02rem; line-height: 1.9; color: var(--c-text); }
.article-body h2 { font-size: 1.4rem; margin: 40px 0 14px; padding-left: 12px; border-left: 4px solid var(--c-primary); color: var(--c-text); }
.article-body h3 { font-size: 1.15rem; margin: 28px 0 12px; color: var(--c-text); }
.article-body p { margin-bottom: 18px; color: var(--c-text-dim); }
.article-body strong { color: var(--c-text); font-weight: 600; }
.article-body em { color: var(--c-primary); font-style: normal; }
.article-body ul, .article-body ol { margin: 16px 0 22px; padding-left: 24px; color: var(--c-text-dim); }
.article-body li { margin-bottom: 8px; }
.article-body ul li::marker { color: var(--c-primary); }
.article-body ol li::marker { color: var(--c-primary); font-weight: 600; }
.article-body blockquote { margin: 24px 0; padding: 16px 20px; background: var(--c-primary-soft); border-left: 4px solid var(--c-primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--c-text); }
.article-body blockquote p { margin: 0; color: inherit; }
.article-body code {
  font-family: var(--mono); font-size: .9em; padding: 2px 8px; border-radius: 4px;
  background: var(--c-bg-2); color: var(--c-primary); border: 1px solid var(--c-border);
}
.article-body pre { margin: 22px 0; padding: 20px 22px; background: var(--color-bg-1); border-radius: var(--radius-sm); overflow-x: auto; border: 1px solid var(--color-border); }
.article-body pre code { padding: 0; background: transparent; border: none; color: var(--color-text-2); font-size: .88rem; line-height: 1.7; }

.article-nav { margin-top: 60px; padding-top: 28px; border-top: 1px solid var(--c-border); }

/* ===== 文章互动 + 阅读体验（post-interact.js） ===== */
.reading-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 1000;
  background: transparent; pointer-events: none;
}
.reading-progress i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: 0 2px 2px 0;
}
.back-to-top {
  position: fixed; right: 24px; bottom: 28px; z-index: 998;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--c-border);
  background: var(--c-card); color: var(--c-primary); font-size: 1.2rem; cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0; transform: translateY(12px); pointer-events: none; transition: all .25s;
}
.back-to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--c-primary); color: #fff; }

.post-extra { max-width: 760px; margin: 0 auto; padding: 0 20px 80px; }

.post-actions { display: flex; align-items: center; gap: 12px; padding: 20px 0; border-top: 1px solid var(--c-border); }
.pa-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--c-border);
  background: var(--c-card); color: var(--c-text-dim); font-size: .9rem; cursor: pointer; transition: all .2s;
}
.pa-btn:hover { border-color: var(--c-primary); color: var(--c-primary); transform: translateY(-1px); }
.pa-btn.active { background: var(--c-primary-soft); border-color: var(--c-primary); color: var(--c-primary); }
.pa-btn .cnt { font-variant-numeric: tabular-nums; }
.pa-views { margin-left: auto; color: var(--c-text-mute); font-size: .85rem; }

.post-nav { display: flex; justify-content: space-between; gap: 16px; margin: 8px 0 40px; }
.pn-link {
  flex: 1; max-width: 48%; padding: 14px 18px; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  text-decoration: none; transition: all .2s; background: var(--c-card);
}
.pn-link:hover { border-color: var(--color-primary); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.pn-next { text-align: right; }
.pn-label { display: block; font-size: .75rem; color: var(--c-text-mute); margin-bottom: 4px; }
.pn-title { color: var(--c-text); font-size: .92rem; font-weight: 600; }

.comments { margin-top: 12px; }
.comments-title { font-size: 1.15rem; margin-bottom: 18px; color: var(--c-text); display: flex; align-items: center; gap: 6px; }
.cmt-count { color: var(--c-text-mute); font-size: .85rem; font-weight: 400; }
.cmt-login-tip { padding: 14px 16px; background: var(--c-primary-soft); border-radius: var(--radius-sm); color: var(--c-text-dim); font-size: .88rem; margin-bottom: 20px; }
.cmt-login-tip a { color: var(--c-primary); font-weight: 600; }
.cmt-form { margin-bottom: 24px; }
.cmt-me { font-size: .85rem; color: var(--c-text-dim); margin-bottom: 8px; }
.cmt-form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  background: var(--c-bg); color: var(--c-text); font-size: .92rem; font-family: inherit; resize: vertical;
}
.cmt-form textarea:focus { outline: none; border-color: var(--c-primary); }
.cmt-form-foot { display: flex; justify-content: flex-end; gap: 8px; margin-top: 10px; }
.cmt-form--reply { margin-top: 12px; }

.cmt-list { display: flex; flex-direction: column; gap: 20px; }
.cmt-empty { text-align: center; padding: 32px 16px; color: var(--c-text-mute); font-size: .88rem; }
.cmt-item { }
.cmt-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.cmt-avatar { width: 38px; height: 38px; border-radius: 50%; overflow: hidden; flex-shrink: 0; }
.cmt-avatar-ph {
  width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); color: #fff; font-weight: 700; font-size: .9rem;
}
.cmt-avatar-img { width: 38px; height: 38px; object-fit: cover; border-radius: 50%; }
.cmt-meta { display: flex; flex-direction: column; line-height: 1.3; }
.cmt-name { font-weight: 600; color: var(--c-text); font-size: .9rem; }
.cmt-time { color: var(--c-text-mute); font-size: .75rem; }
.cmt-ops { margin-left: auto; display: flex; gap: 12px; }
.cmt-op { background: none; border: none; color: var(--c-text-mute); font-size: .78rem; cursor: pointer; padding: 2px 4px; }
.cmt-op:hover { color: var(--c-primary); }
.cmt-body { color: var(--c-text-dim); font-size: .92rem; line-height: 1.7; word-break: break-word; padding-left: 48px; }
.cmt-replies { margin: 12px 0 0 48px; padding-left: 16px; border-left: 2px solid var(--c-border); display: flex; flex-direction: column; gap: 16px; }
.cmt-replies .cmt-body { padding-left: 0; }
.cmt-replies .cmt-avatar, .cmt-replies .cmt-avatar-ph, .cmt-replies .cmt-avatar-img { width: 30px; height: 30px; font-size: .75rem; }
.cmt-reply-form { padding-left: 48px; display: none; }
.cmt-reply-form.open { display: block; }

@media (max-width: 600px) {
  .post-extra { padding: 0 16px 60px; }
  .post-nav { flex-direction: column; }
  .pn-link { max-width: 100%; }
  .pn-next { text-align: left; }
  .cmt-body, .cmt-reply-form { padding-left: 0; }
  .cmt-replies { margin-left: 0; padding-left: 12px; }
  .back-to-top { right: 16px; bottom: 20px; width: 40px; height: 40px; }
}


@media (max-width: 600px) {
  .article { padding: 60px 16px 40px; }
  .article-header h1 { font-size: 1.6rem; }
  .article-body h2 { font-size: 1.2rem; }
  .article-body pre { padding: 14px 16px; font-size: .82rem; }
}

/* ===== 动态文章（article.html / /a/N） ===== */
.back-link { display: inline-block; color: var(--c-primary); font-size: .9rem; margin-bottom: 20px; text-decoration: none; }
.back-link:hover { text-decoration: underline; }
.article-title { font-size: 2rem; line-height: 1.35; margin-bottom: 12px; color: var(--c-text); }
.article-cover { margin: 24px 0 32px; border-radius: var(--radius); overflow: hidden; }
.article-cover img { width: 100%; display: block; }
.article-content { font-size: 1.02rem; line-height: 1.9; color: var(--c-text); }
.article-content h2 { font-size: 1.4rem; margin: 40px 0 14px; padding-left: 12px; border-left: 4px solid var(--c-primary); color: var(--c-text); }
.article-content h3 { font-size: 1.15rem; margin: 28px 0 12px; color: var(--c-text); }
.article-content p { margin-bottom: 18px; color: var(--c-text-dim); }
.article-content strong { color: var(--c-text); font-weight: 600; }
.article-content em { color: var(--c-primary); font-style: normal; }
.article-content ul, .article-content ol { margin: 16px 0 22px; padding-left: 24px; color: var(--c-text-dim); }
.article-content li { margin-bottom: 8px; }
.article-content ul li::marker, .article-content ol li::marker { color: var(--c-primary); }
.article-content blockquote { margin: 24px 0; padding: 16px 20px; background: var(--c-primary-soft); border-left: 4px solid var(--c-primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--c-text); }
.article-content blockquote p { margin: 0; color: inherit; }
.article-content code { background: var(--c-primary-soft); padding: 2px 7px; border-radius: 5px; font-size: .88em; color: var(--c-primary); }
.article-content pre { margin: 22px 0; padding: 20px 22px; background: var(--color-bg-1); border-radius: var(--radius-sm); overflow-x: auto; border: 1px solid var(--color-border); }
.article-content pre code { padding: 0; background: transparent; border: none; color: var(--color-text-2); font-size: .88rem; line-height: 1.7; }
.article-content img { max-width: 100%; border-radius: var(--radius-sm); }
.article-content a { color: var(--c-primary); }

/* ===== 相关推荐 ===== */
.related { margin: 48px 0 8px; }
.related-title { font-size: 1.15rem; margin-bottom: 18px; color: var(--c-text); }
.related-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.related-card { display: block; text-decoration: none; border: 1px solid var(--c-border); border-radius: var(--radius-sm); overflow: hidden; background: var(--c-card); transition: transform .25s, box-shadow .25s; }
.related-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.related-cover { aspect-ratio: 16/9; overflow: hidden; background: var(--c-primary-soft); }
.related-cover img { width: 100%; height: 100%; object-fit: cover; }
.related-name { padding: 10px 12px; font-size: .9rem; color: var(--c-text); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
@media (max-width: 600px) {
  .related-list { grid-template-columns: 1fr; }
  .article-title { font-size: 1.55rem; }
}

/* ===== blog 搜索/标签栏 ===== */
.blog-toolbar { margin-bottom: 14px; }
.blog-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.tag-chip { border: 1px solid var(--c-border); background: var(--c-card); color: var(--c-text-dim); padding: 5px 12px; border-radius: 999px; font-size: .82rem; cursor: pointer; transition: all .2s; }
.tag-chip i { font-style: normal; opacity: .6; margin-left: 2px; }
.tag-chip:hover { border-color: var(--c-primary); color: var(--c-primary); }
.tag-chip.on { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.tag-chip.on i { color: rgba(255,255,255,.8); }
.tag.tag-active { background: var(--c-primary); color: #fff; }
.post-cover-ph { display: flex; align-items: center; justify-content: center; background: var(--c-primary-soft); font-size: 2rem; }

/* =====================================================================
   浅色主题 —— 延伸设计（主 digest 为 dark-first；浅底为同构语义槽位延伸，
   参考知识库中 apple/stripe 浅色体系：#fff 画布 / 深墨字 / 发丝黑线）
   ===================================================================== */
:root[data-theme="light"] {
  color-scheme: light;
  /* 延伸：背景分层（近白） */
  --color-bg: #ffffff;
  --color-bg-1: #f6f8fa;
  --color-surface: #ffffff;
  --color-surface-2: #f6f8fa;
  /* 延伸：墨色文字四档 */
  --color-text: #0a0d12;
  --color-text-2: #33383f;
  --color-text-3: #6b7280;
  --color-text-4: #9aa1ab;
  /* 延伸：黑系发丝边框 */
  --color-border: rgba(10, 13, 18, .12);
  --color-border-2: #dce0e5;
  --color-border-hi: rgba(10, 13, 18, .24);
  --color-hairline: rgba(10, 13, 18, .08);
  /* 品牌靛蓝保持不变（品牌锚点）；仅 hover 档在浅底加深（延伸） */
  --color-primary: #5e6ad2;
  --color-primary-hi: #4a56c4;
  --color-accent: #675ce0;
  /* 延伸：语义色在浅底加深一档以保证对比度 */
  --color-success: #1f8f3a;
  --color-warning: #9a6b00;
  --color-danger: #d14343;
  --color-info: #3b7be0;
  /* 延伸：浅底投影 */
  --shadow-low: 0 1px 2px rgba(16, 18, 22, .05);
  --shadow-md: 0 6px 24px rgba(16, 18, 22, .08);
  --shadow-lg: 0 16px 48px rgba(16, 18, 22, .12);
  --shadow-focus: 0 0 0 2px #fff, 0 0 0 4px var(--color-primary);

  /* ===== 兼容别名同步映射（M2 页面迁移期） ===== */
  --c-bg: #ffffff;
  --c-bg-2: #f6f8fa;
  --c-card: #ffffff;
  --c-border: rgba(10, 13, 18, .12);
  --c-border-strong: #dce0e5;
  --c-text: #0a0d12;
  --c-text-dim: #33383f;
  --c-text-mute: #6b7280;
  --c-primary: #5e6ad2;
  --c-primary-soft: rgba(94, 106, 210, .1);
  --c-primary-glow: rgba(94, 106, 210, .2);
  --c-accent: #675ce0;
  --c-accent-soft: rgba(103, 92, 224, .1);
  --c-accent-glow: rgba(103, 92, 224, .18);
  --c-success: #1f8f3a;
  --c-danger: #d14343;
  --c-warning: #9a6b00;
  --shadow-sm: 0 1px 2px rgba(16, 18, 22, .05);
}

/* 浅色下的组件级覆盖（延伸） */
:root[data-theme="light"] .nav.scrolled {
  background: rgba(255, 255, 255, .72);
  border-bottom-color: var(--color-hairline);
}
:root[data-theme="light"] .nav-links.mobile {
  background: rgba(255, 255, 255, .96);
  border-bottom-color: var(--color-hairline);
}
:root[data-theme="light"] .dot-grid {
  background-image: radial-gradient(circle at 1px 1px, rgba(10, 13, 18, .10) 1px, transparent 0);
}
:root[data-theme="light"] .hero-bio em,
:root[data-theme="light"] .hero-greet::before,
:root[data-theme="light"] .section-num { color: var(--color-primary); }
:root[data-theme="light"] .section-link { color: var(--color-primary); }
:root[data-theme="light"] .tag { background: rgba(94, 106, 210, .1); color: var(--color-primary); }
:root[data-theme="light"] .post-card { box-shadow: inset 0 0 0 1px var(--color-hairline), var(--shadow-low); }
:root[data-theme="light"] .post-card:hover { box-shadow: inset 0 0 0 1px var(--color-border-hi), var(--shadow-md); }
:root[data-theme="light"] .post-cover { background: var(--color-bg-1); }
:root[data-theme="light"] .btn-outline { border-color: rgba(10, 13, 18, .22); color: var(--color-text); }
:root[data-theme="light"] .btn-outline:hover { background: rgba(10, 13, 18, .05); border-color: rgba(10, 13, 18, .4); }
:root[data-theme="light"] .btn-ghost:hover { background: rgba(10, 13, 18, .05); }
:root[data-theme="light"] .post-card.card-tilt::after {
  background: radial-gradient(circle at var(--gx, 50%) var(--gy, 50%), rgba(10, 13, 18, .05), transparent 45%);
}
:root[data-theme="light"] .form-input,
:root[data-theme="light"] .form-textarea,
:root[data-theme="light"] .form-select { background: #fff; border-color: var(--color-border); color: var(--color-text); }
:root[data-theme="light"] .article-content pre,
:root[data-theme="light"] pre { background: #0f1011; border-color: #23252a; }

/* ===== 主题切换按钮（34px 圆形 icon button，§7 图标按钮） ===== */
.theme-toggle {
  width: 34px; height: 34px; border-radius: var(--radius-pill); font-size: 1rem;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid transparent; color: var(--color-text-2);
  transition: background var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
  cursor: pointer;
}
.theme-toggle:hover { background: var(--color-hairline); }
.theme-toggle:active { transform: scale(.92); }