/* ============================================================
   阿夏的 AI 自习室 · 设计系统  (v4 · 暗色终端 / 霓虹科技风)
   换全站风格只改这一个文件
   ============================================================ */
@import url("https://fonts.googleapis.com/css2?family=Baloo+2:wght@700;800&family=Noto+Sans+SC:wght@400;500;700;900&family=JetBrains+Mono:wght@400;600;700&display=swap");

:root{
  /* ===== 颜色 token ===== */
  --bg:#0a0e1a;            /* 页面背景：暗夜蓝黑 */
  --surface:#101626;       /* 卡片 / 主表面 */
  --surface-2:#161e33;     /* 次级表面 */
  --text:#c6d2e8;          /* 正文：浅蓝灰（对 bg 对比度 ~10:1） */
  --text-soft:#8493b8;     /* 弱化文字（对 bg ~5.5:1，过 AA） */
  --heading:#e9effc;       /* 标题：近白 */
  --primary:#22d3ee;       /* 强调青：电光青 / 链接 / 终端提示符 */
  --primary-deep:#7debfa;  /* hover / active（暗底上 hover 变更亮） */
  --primary-soft:rgba(34,211,238,.12);  /* 青色微填充 */
  --accent2:#5b9bff;       /* 第二强调：雷姆蓝 */
  --border:#233252;        /* 边框 */
  --border-soft:#18233e;   /* 更浅分隔线 */
  --glow:0 0 16px rgba(34,211,238,.25);          /* 青色辉光 */
  --glow-strong:0 0 24px rgba(34,211,238,.45);

  /* ===== 字体 ===== */
  --font-sans:"Noto Sans SC","HarmonyOS Sans","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --font-display:"JetBrains Mono","Baloo 2",var(--font-sans);
  --font-mono:"JetBrains Mono",ui-monospace,monospace;

  /* ===== 字号层级 (H1→正文 共 5 级) ===== */
  --fs-h1:clamp(40px,6vw,56px);  --lh-h1:1.1;
  --fs-h2:30px;                  --lh-h2:1.3;
  --fs-h3:22px;                  --lh-h3:1.4;
  --fs-h4:18px;                  --lh-h4:1.5;
  --fs-body:17px;                --lh-body:1.75;
  --fs-small:13px;               --lh-small:1.5;

  /* ===== 设计 token ===== */
  --r-sm:8px;
  --r-lg:14px;
  --shadow:0 8px 32px rgba(0,0,0,.45);
  --shadow-sm:0 2px 8px rgba(0,0,0,.35);
  --maxw:1040px;
  --maxw-read:760px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;color:var(--text);background:var(--bg);
  font-family:var(--font-sans);
  font-size:var(--fs-body);line-height:var(--lh-body);font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
/* ===== 背景：细网格 + 顶部青色光晕（固定层，不随滚动） ===== */
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%,rgba(34,211,238,.07),transparent 60%),
    radial-gradient(ellipse 50% 40% at 90% 10%,rgba(91,155,255,.05),transparent 60%),
    linear-gradient(rgba(91,155,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(91,155,255,.04) 1px,transparent 1px);
  background-size:auto,auto,44px 44px,44px 44px;}

/* ===== 字体层级基类 ===== */
h1,h2,h3,h4{color:var(--heading);font-weight:700;margin:0;}
h2{font-size:var(--fs-h2);line-height:var(--lh-h2);font-weight:700;}
h3{font-size:var(--fs-h3);line-height:var(--lh-h3);font-weight:700;}
h4{font-size:var(--fs-h4);line-height:var(--lh-h4);font-weight:600;}
a{color:var(--primary);text-decoration:none;transition:color .15s;}
a:hover{color:var(--primary-deep);}
strong,b{font-weight:700;color:var(--heading);}
::selection{background:rgba(34,211,238,.3);color:#fff;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.wrap-narrow{max-width:var(--maxw-read);margin:0 auto;padding:0 24px;}

/* ============================================================
   导航
   ============================================================ */
nav{position:sticky;top:0;z-index:50;background:rgba(10,14,26,.8);
  backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--border-soft);}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:24px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-weight:700;
  font-size:16px;color:var(--heading);text-decoration:none;letter-spacing:.02em;}
.brand .mascot{width:32px;height:32px;border-radius:50%;object-fit:cover;flex:none;cursor:pointer;
  border:2px solid var(--primary);background:var(--surface-2);
  box-shadow:0 0 0 0 rgba(34,211,238,.5);animation:breathe 3.2s ease-in-out infinite;}
@keyframes breathe{
  0%,100%{box-shadow:0 0 4px 0 rgba(34,211,238,.35);}
  50%{box-shadow:0 0 14px 2px rgba(34,211,238,.55);}
}
.nav-links{margin-left:auto;display:flex;gap:4px;align-items:center;flex-wrap:wrap;}
.nav-links a{font-size:14px;color:var(--text-soft);font-weight:500;padding:8px 14px;border-radius:var(--r-sm);
  font-family:var(--font-mono);transition:.15s;display:inline-flex;align-items:center;gap:6px;}
.nav-links a:hover{color:var(--heading);background:var(--surface-2);}
.nav-links a.active{color:var(--primary);font-weight:700;background:var(--primary-soft);text-shadow:0 0 12px rgba(34,211,238,.5);}
.nav-links a .ext{font-size:10px;opacity:.7;}
@media(max-width:600px){.nav-inner{gap:10px;padding:10px 16px;}.nav-links{gap:2px;}.nav-links a{padding:7px 10px;font-size:13px;}}

/* ============================================================
   首页 Hero — 终端窗口 + 雷姆全息立绘
   ============================================================ */
.hero-overlap{position:relative;padding:72px 0 64px;overflow:hidden;}
.hero-overlap .copy{position:relative;z-index:2;max-width:640px;}
.hero-overlap .copy h1{font-family:var(--font-display);font-weight:800;color:var(--heading);
  font-size:var(--fs-h1);line-height:var(--lh-h1);margin:0 0 16px;letter-spacing:.4px;white-space:nowrap;
  text-shadow:0 0 28px rgba(34,211,238,.25);}
.hero-overlap .copy h1 .acc{color:var(--primary);}
.hero-overlap .copy .sub{font-size:var(--fs-h4);line-height:1.7;color:var(--text-soft);max-width:46ch;margin:0;font-weight:400;}
/* 雷姆立绘：暗底全息投影 —— 青色辉光 + 柔边融入 */
.hero-overlap .watermark{position:absolute;top:50%;right:-30px;transform:translateY(-50%);
  width:min(440px,46%);z-index:0;pointer-events:none;opacity:.34;
  filter:drop-shadow(0 0 18px rgba(34,211,238,.45)) drop-shadow(0 0 60px rgba(91,155,255,.3)) saturate(1.05);
  -webkit-mask-image:radial-gradient(62% 68% at 55% 45%,#000 42%,transparent 80%);
          mask-image:radial-gradient(62% 68% at 55% 45%,#000 42%,transparent 80%);}
.hero-overlap .watermark img{width:100%;display:block;}
.hero-overlap .cta{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap;position:relative;z-index:2;}
@media(max-width:720px){
  .hero-overlap{padding:40px 0 40px;}
  .hero-overlap .copy h1{font-size:clamp(30px,8.6vw,44px);}
  .hero-overlap .watermark{right:-30px;width:64%;opacity:.2;}
}

/* ===== 终端窗口组件 ===== */
.term{background:#0c1120;border:1px solid var(--border);border-radius:12px;overflow:hidden;
  box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.04);margin-bottom:28px;max-width:560px;}
.term-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;
  background:rgba(255,255,255,.03);border-bottom:1px solid var(--border-soft);}
.term-bar .dot{width:11px;height:11px;border-radius:50%;flex:none;}
.term-bar .dot.r{background:#ff5f57;}
.term-bar .dot.y{background:#febc2e;}
.term-bar .dot.g{background:#28c840;}
.term-bar .term-title{margin-left:8px;font-family:var(--font-mono);font-size:11.5px;color:var(--text-soft);letter-spacing:.04em;}
.term-body{padding:18px 20px 20px;font-family:var(--font-mono);font-size:14.5px;line-height:2;}
.term-body .line{white-space:pre-wrap;word-break:break-word;}
.term-body .prompt{color:var(--primary);font-weight:700;margin-right:8px;text-shadow:0 0 10px rgba(34,211,238,.6);}
.term-body .cmd{color:var(--heading);}
.term-body .out{color:var(--text);}
.term-body .out .hl{color:var(--primary);font-weight:700;text-shadow:0 0 12px rgba(34,211,238,.5);}
.term-body a{color:var(--accent2);border-bottom:1px dashed rgba(91,155,255,.4);}
.term-body a:hover{color:var(--primary-deep);border-bottom-color:var(--primary);text-shadow:0 0 10px rgba(34,211,238,.4);}
.cursor{display:inline-block;width:9px;height:18px;background:var(--primary);vertical-align:-3px;
  box-shadow:0 0 10px rgba(34,211,238,.8);animation:blink 1.05s steps(1) infinite;}
@keyframes blink{50%{opacity:0;}}
@media(prefers-reduced-motion:reduce){.cursor{animation:none;}}
@media(max-width:720px){.term-body{font-size:13px;padding:14px 14px 16px;}}

.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--primary);font-weight:600;}

/* ===== 按钮 ===== */
.btn{font-size:15px;font-weight:600;padding:12px 22px;border-radius:var(--r-sm);transition:.18s;
  display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-family:var(--font-mono);}
.btn.primary{background:var(--primary);color:#04222b;box-shadow:var(--glow);}
.btn.primary:hover{background:var(--primary-deep);color:#04222b;box-shadow:var(--glow-strong);transform:translateY(-1px);}
.btn.ghost{border:1px solid var(--border);color:var(--heading);background:transparent;}
.btn.ghost:hover{border-color:var(--primary);color:var(--primary);box-shadow:var(--glow);}

/* ============================================================
   区块标题
   ============================================================ */
section.block{padding:56px 0;}
section.block + section.block{border-top:1px solid var(--border-soft);}
.sec-head{display:flex;align-items:baseline;gap:12px;margin-bottom:24px;}
.sec-head h2{font-size:var(--fs-h2);color:var(--heading);}
.sec-head .en{font-family:var(--font-mono);font-size:12px;color:var(--primary);letter-spacing:.08em;text-transform:none;opacity:.75;}

/* ============================================================
   卡片 / 列表 —— 终端窗口质感
   ============================================================ */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;}
.card{display:block;position:relative;text-decoration:none;color:inherit;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--r-lg);padding:44px 24px 24px;box-shadow:var(--shadow-sm);transition:.2s;}
/* 卡片左上角：终端窗口三圆点 */
.card::before{content:"";position:absolute;top:17px;left:24px;width:9px;height:9px;border-radius:50%;
  background:#3a4664;box-shadow:15px 0 0 #3a4664,30px 0 0 #3a4664;transition:.2s;}
.card:hover{transform:translateY(-3px);border-color:rgba(34,211,238,.55);box-shadow:var(--glow),0 12px 36px rgba(0,0,0,.5);}
.card:hover::before{background:#ff5f57;box-shadow:15px 0 0 #febc2e,30px 0 0 #28c840;}
.card .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--primary);font-weight:600;}
.card h3{font-size:var(--fs-h3);margin:10px 0 8px;color:var(--heading);line-height:1.35;}
.card p{font-size:15px;color:var(--text-soft);margin:0;line-height:1.65;}
.card .meta{margin-top:16px;font-family:var(--font-mono);font-size:12px;color:var(--text-soft);display:flex;gap:12px;flex-wrap:wrap;}
.pill{display:inline-block;font-family:var(--font-mono);font-size:11px;background:var(--primary-soft);
  color:var(--primary);padding:4px 10px;border-radius:999px;border:1px solid rgba(34,211,238,.3);}

.entry{display:flex;gap:20px;text-decoration:none;color:inherit;padding:24px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);margin-bottom:16px;transition:.2s;}
.entry:hover{transform:translateY(-2px);border-color:rgba(34,211,238,.55);box-shadow:var(--glow),0 12px 36px rgba(0,0,0,.5);}
.entry .idx{font-family:var(--font-mono);font-weight:700;font-size:26px;min-width:44px;line-height:1.2;}
.entry .body{flex:1;}
.entry .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--primary);font-weight:600;}
.entry h3{font-size:var(--fs-h3);margin:8px 0;color:var(--heading);line-height:1.35;}
.entry p{font-size:15px;color:var(--text-soft);margin:0;line-height:1.65;}
.entry .meta{margin-top:12px;font-family:var(--font-mono);font-size:12px;color:var(--text-soft);display:flex;gap:14px;flex-wrap:wrap;}
.entry .arrow{align-self:center;color:var(--border);font-size:20px;transition:.2s;}
.entry:hover .arrow{color:var(--primary);transform:translateX(4px);text-shadow:0 0 10px rgba(34,211,238,.6);}
@media(max-width:560px){.entry .arrow{display:none;}.entry{gap:14px;padding:20px;}.entry .idx{font-size:22px;min-width:32px;}}

.about-text{max-width:64ch;color:var(--text-soft);font-size:var(--fs-body);}
.about-text b{color:var(--heading);}

/* ============================================================
   文章页
   ============================================================ */
.backlink{font-family:var(--font-mono);font-size:13px;color:var(--text-soft);text-decoration:none;
  display:inline-flex;align-items:center;gap:6px;margin-bottom:24px;}
.backlink:hover{color:var(--primary);}
header.doc{border-bottom:1px solid var(--border);padding-bottom:24px;margin-bottom:8px;}
header.doc h1{font-size:var(--fs-h1);line-height:var(--lh-h1);color:var(--heading);font-weight:700;margin:16px 0 14px;
  text-shadow:0 0 28px rgba(34,211,238,.18);}
header.doc .sub{font-size:var(--fs-h4);color:var(--text-soft);max-width:60ch;font-weight:400;line-height:1.6;}
.meta{font-family:var(--font-mono);font-size:12px;color:var(--text-soft);margin-top:16px;display:flex;gap:16px;flex-wrap:wrap;}
.meta span::before{content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--primary);
  box-shadow:0 0 6px rgba(34,211,238,.8);margin-right:7px;vertical-align:middle;}

article section{margin-top:48px;}
article h2{font-size:var(--fs-h2);color:var(--heading);margin:0 0 16px;display:flex;align-items:baseline;gap:12px;line-height:var(--lh-h2);}
article h2 .num{font-family:var(--font-mono);font-size:13px;font-weight:700;color:#04222b;background:var(--primary);
  width:28px;height:28px;min-width:28px;border-radius:var(--r-sm);display:inline-flex;align-items:center;justify-content:center;
  transform:translateY(-2px);box-shadow:var(--glow);}
article h3{font-size:var(--fs-h3);color:var(--heading);margin:28px 0 10px;font-weight:700;}
article p{margin:16px 0;}
.accent{color:var(--primary);font-weight:700;}
.accent2{color:var(--accent2);font-weight:700;}
article ul,article ol{margin:16px 0;padding-left:22px;}
article li{margin:8px 0;}

.tldr{margin:32px 0 8px;padding:24px;background:var(--surface-2);color:var(--text);border-radius:var(--r-lg);
  border:1px solid rgba(34,211,238,.3);box-shadow:var(--glow),var(--shadow-sm);}
.tldr .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--primary);text-transform:uppercase;}
.tldr p{margin:10px 0 0;font-size:var(--fs-h4);line-height:1.7;color:var(--text);}
.tldr b{color:var(--heading);border-bottom:2px solid var(--primary);}

.note{border-left:3px solid var(--primary);background:var(--surface);padding:16px 20px;margin:20px 0;
  border-radius:0 var(--r-sm) var(--r-sm) 0;font-size:15.5px;box-shadow:var(--shadow-sm);border-top:1px solid var(--border-soft);
  border-right:1px solid var(--border-soft);border-bottom:1px solid var(--border-soft);}
.note.warn{border-left-color:#fbbf24;}
.note.key{border-left-color:var(--accent2);}
.note .lbl{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-soft);display:block;margin-bottom:4px;}

table{width:100%;border-collapse:separate;border-spacing:0;margin:18px 0;font-size:15px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-sm);}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--border-soft);vertical-align:top;}
tr:last-child td{border-bottom:none;}
th{font-size:13px;letter-spacing:.04em;color:var(--primary);background:var(--surface-2);font-weight:700;font-family:var(--font-mono);}
tbody tr:hover{background:var(--surface-2);}
td b{color:var(--heading);}

.modes{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0;}
@media(max-width:640px){.modes{grid-template-columns:1fr;}}
.mcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:20px;box-shadow:var(--shadow-sm);border-top:3px solid var(--primary);}
.mcard.m2{border-top-color:var(--accent2);}
.mcard .ph{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--primary);font-weight:600;}
.mcard h4{font-size:var(--fs-h4);margin:8px 0 12px;color:var(--heading);}
.flow{font-size:14.5px;line-height:1.85;color:var(--text);}
.flow .step{display:block;}
.flow .arrow{color:var(--text-soft);}

pre{background:#0c1120;color:#c9d8f5;font-family:var(--font-mono);font-size:13px;line-height:1.6;
  padding:20px;border-radius:var(--r-lg);overflow-x:auto;margin:20px 0;border:1px solid var(--border);}
code{font-family:var(--font-mono);font-size:.9em;background:var(--surface-2);padding:2px 6px;border-radius:6px;color:var(--primary);border:1px solid var(--border-soft);}
pre code{background:none;padding:0;color:inherit;border:none;}

.ladder{counter-reset:rung;list-style:none;padding:0;margin:18px 0;}
.ladder li{counter-increment:rung;position:relative;padding:16px 18px 16px 56px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--r-lg);margin:12px 0;box-shadow:var(--shadow-sm);}
.ladder li::before{content:counter(rung);position:absolute;left:16px;top:14px;font-family:var(--font-mono);
  font-weight:700;font-size:20px;color:var(--primary);width:26px;text-align:center;text-shadow:0 0 12px rgba(34,211,238,.5);}

/* ============================================================
   SVG 流程图
   ============================================================ */
.flowfig{margin:24px 0 8px;}
.flow-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:start;}
.flow-col{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:16px;box-shadow:var(--shadow-sm);}
.flow-col.c2{border-top:3px solid var(--accent2);}
.flow-col.c1{border-top:3px solid var(--primary);}
.flow-col .col-h{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--primary);font-weight:600;margin-bottom:12px;text-align:center;}
.flow-col.c2 .col-h{color:var(--accent2);}
.fnode{display:flex;align-items:center;justify-content:center;text-align:center;gap:6px;
  background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-sm);
  padding:9px 12px;font-size:13.5px;color:var(--text);line-height:1.35;font-weight:500;}
.fnode.hot{background:var(--primary-soft);border-color:rgba(34,211,238,.4);color:var(--heading);font-weight:700;}
.farrow{display:flex;justify-content:center;color:var(--primary);height:18px;align-items:center;}
.farrow svg{width:14px;height:14px;}
.flow-loop{font-family:var(--font-mono);font-size:11px;color:var(--text-soft);text-align:center;margin-top:8px;}
.flow-mid{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding-top:40px;}
.flow-mid .lab{font-family:var(--font-mono);font-size:11px;color:var(--primary);font-weight:600;}
.flow-mid svg{width:30px;height:30px;color:var(--primary);}
.verifier{margin-top:18px;display:flex;flex-direction:column;align-items:center;gap:10px;}
.verifier .converge{color:var(--primary);}
.verifier .vbox{background:var(--surface-2);color:var(--heading);border-radius:var(--r-lg);padding:14px 24px;text-align:center;
  border:1px solid rgba(34,211,238,.35);box-shadow:var(--glow);max-width:520px;}
.verifier .vbox .vt{font-weight:700;font-size:16px;}
.verifier .vbox .vd{font-size:13px;color:var(--text-soft);margin-top:4px;line-height:1.5;}
@media(max-width:640px){
  .flow-grid{grid-template-columns:1fr;}
  .flow-mid{padding:6px 0;}
  .flow-mid svg{transform:rotate(90deg);}
}

footer{border-top:1px solid var(--border-soft);padding:28px 0 56px;font-family:var(--font-mono);font-size:12px;color:var(--text-soft);margin-top:40px;}
article footer{margin-top:64px;}
.reveal{opacity:0;transform:translateY(12px);animation:rise .6s cubic-bezier(.2,.7,.3,1) forwards;}
@keyframes rise{to{opacity:1;transform:none;}}

/* ============================================================
   阅读增强
   ============================================================ */
.read-progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;background:var(--primary);
  box-shadow:0 0 8px rgba(34,211,238,.7);transition:width .08s linear;}
.reader-tools{position:fixed;right:16px;bottom:18px;z-index:55;display:flex;flex-direction:column;gap:6px;
  background:rgba(16,22,38,.92);backdrop-filter:blur(8px);border:1px solid var(--border);
  border-radius:999px;padding:7px 6px;box-shadow:var(--shadow);}
.reader-tools button{width:38px;height:38px;border:none;border-radius:50%;cursor:pointer;
  font-family:var(--font-mono);font-weight:700;color:var(--primary);background:var(--surface-2);font-size:15px;transition:.15s;
  display:flex;align-items:center;justify-content:center;}
.reader-tools button:hover{background:var(--primary);color:#04222b;box-shadow:var(--glow);}
.reader-tools button:active{transform:scale(.92);}
@media(max-width:560px){.reader-tools{right:10px;bottom:12px;}}

.reading{--fs:17px;--lh:1.78;font-size:var(--fs);line-height:var(--lh);}
.reading.fs-s{--fs:15.5px;}
.reading.fs-m{--fs:17px;}
.reading.fs-l{--fs:19px;}
.reading.fs-xl{--fs:21px;}
.reading article p,.reading article li,.reading article td,.reading article th,
.reading .note,.reading .tldr p:first-of-type,.reading .mcard h4,.reading .ladder li{
  font-size:var(--fs)!important;line-height:var(--lh);}
.reading article p{margin:16px 0;}
.reading article h2{margin-top:56px;}
@media(max-width:560px){
  .reading article table{font-size:13.5px;}
  .reading article th,.reading article td{padding:10px 11px;}
  header.doc h1{font-size:30px;}
}

/* ============================================================
   留言互动区（雷姆信箱 · 暗色霓虹）
   ============================================================ */
.board{margin-top:64px;position:relative;border-radius:var(--r-lg);padding:32px 24px;overflow:hidden;
  background:linear-gradient(150deg,#0e1730 0%,#13204a 55%,#0c1428 100%);box-shadow:var(--shadow);
  border:1px solid var(--border);}
.board::before{content:"";position:absolute;inset:-40%;z-index:0;opacity:.16;
  background:conic-gradient(from 0deg,#22d3ee,#5b9bff,#818cf8,#22d3ee);filter:blur(48px);animation:spin 18s linear infinite;}
.board::after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.4;
  background-image:radial-gradient(1.4px 1.4px at 20% 30%,#fff,transparent),
    radial-gradient(1.4px 1.4px at 72% 62%,#bfe,transparent),
    radial-gradient(1px 1px at 42% 82%,#fff,transparent),
    radial-gradient(1.4px 1.4px at 86% 22%,#cfe2ff,transparent);}
@keyframes spin{to{transform:rotate(360deg);}}
.board>*{position:relative;z-index:1;}
.board h2{font-size:var(--fs-h2);color:#fff;margin:0 0 4px;display:flex;align-items:center;gap:10px;}
.board .desc{color:#9db4e4;font-size:15px;margin:0 0 24px;}
.board-form{background:rgba(255,255,255,.05);backdrop-filter:blur(8px);border:1px solid rgba(120,170,255,.22);
  border-radius:var(--r-lg);padding:20px;}
.board-form .row{margin-bottom:12px;}
.board-form input,.board-form textarea{width:100%;font:inherit;font-size:16px;color:#eaf1ff;
  background:rgba(8,13,28,.65);border:1px solid rgba(120,170,255,.25);border-radius:var(--r-sm);padding:13px 15px;transition:.15s;-webkit-appearance:none;}
.board-form input::placeholder,.board-form textarea::placeholder{color:#6f7da8;}
.board-form input:focus,.board-form textarea:focus{outline:none;border-color:var(--primary);background:rgba(8,13,28,.85);box-shadow:0 0 0 3px rgba(34,211,238,.2);}
.board-form input.name{max-width:240px;}
.board-form textarea{min-height:104px;resize:vertical;line-height:1.7;}
.board-form .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden;}
.board-form .actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:8px;}
.board-form .btn-neon{font-family:var(--font-mono);font-weight:700;font-size:16px;cursor:pointer;color:#04222b;
  border:none;padding:13px 28px;border-radius:var(--r-sm);background:linear-gradient(90deg,#22d3ee,#5b9bff);
  box-shadow:0 0 18px rgba(34,211,238,.45);transition:.18s;}
.board-form .btn-neon:hover{transform:translateY(-2px);filter:brightness(1.1);}
.board-form .btn-neon:active{transform:scale(.96);}
.board-form .btn-neon:disabled{opacity:.6;cursor:wait;}
.board-form .count{font-family:var(--font-mono);font-size:13px;color:#8fa6d6;margin-left:auto;}
.board-form .hint{font-size:14px;min-height:20px;font-weight:600;}
.board-form .hint.ok{color:#34d399;}
.board-form .hint.err{color:#fb7eaa;}
@media(max-width:560px){.board-form input.name{max-width:none;}}
.board-list{margin-top:24px;display:flex;flex-direction:column;gap:12px;}
.msg{background:rgba(255,255,255,.05);border:1px solid rgba(120,170,255,.18);border-radius:var(--r-lg);
  padding:16px 18px;backdrop-filter:blur(6px);animation:rise .5s ease forwards;}
.msg .top{display:flex;align-items:center;gap:11px;margin-bottom:8px;}
.msg .who{font-family:var(--font-mono);font-weight:700;color:#eaf1ff;font-size:16px;}
.msg .when{font-family:var(--font-mono);font-size:11.5px;color:#8398c8;margin-left:auto;}
.msg .body{font-size:16px;line-height:1.8;color:#d6e2fa;white-space:pre-wrap;word-break:break-word;}
.board-empty{text-align:center;color:#8398c8;padding:28px;font-size:15px;}
.board-avatar{width:34px;height:34px;border-radius:50%;flex:none;color:#04222b;font-family:var(--font-mono);
  font-weight:700;font-size:15px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#22d3ee,#5b9bff);}
@media(max-width:560px){.board{padding:24px 16px;margin-top:48px;}.msg .body{font-size:16.5px;}}

/* ============================================================
   v4 终端风细节
   ============================================================ */
/* —— 霓虹渐变文字 —— */
.metal{background:linear-gradient(120deg,#22d3ee 0%,#a5b4fc 50%,#5b9bff 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.entry .idx{background:linear-gradient(135deg,#22d3ee 0%,#5b9bff 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.hero-overlap .copy h1 .acc{background:linear-gradient(120deg,#22d3ee,#5b9bff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;}

/* —— 宽字距大写小标签 —— */
.kicker,.card .tag,.entry .tag,.flow-col .col-h,.res-card .tag,.tldr .tag{
  letter-spacing:.2em!important;text-transform:uppercase;font-weight:600;}
.kicker{font-size:11.5px;color:var(--primary);}
.kicker::before{content:">";display:inline-block;color:var(--primary);font-family:var(--font-mono);
  margin-right:10px;text-shadow:0 0 10px rgba(34,211,238,.6);}
.meta{letter-spacing:.04em;}

/* —— 平滑滚动 Lenis —— */
html.lenis,html.lenis body{height:auto;}
.lenis.lenis-smooth{scroll-behavior:auto!important;}
.lenis.lenis-smooth [data-lenis-prevent]{overscroll-behavior:contain;}
.lenis.lenis-stopped{overflow:hidden;}

/* —— 入场动画 overlay（暗色启动屏）—— */
#intro{position:fixed;inset:0;z-index:9999;background:var(--bg);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;
  transition:opacity .6s ease,visibility .6s ease;}
#intro.done{opacity:0;visibility:hidden;}
#intro .i-brand{display:flex;align-items:center;gap:13px;font-family:var(--font-mono);
  font-weight:700;font-size:22px;color:var(--heading);letter-spacing:.5px;}
#intro .i-brand img{width:44px;height:44px;border-radius:50%;border:2px solid var(--primary);
  box-shadow:0 0 16px rgba(34,211,238,.5);}
#intro .i-bar{width:170px;height:3px;border-radius:2px;background:var(--border-soft);overflow:hidden;}
#intro .i-bar span{display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--primary),var(--accent2));box-shadow:0 0 8px rgba(34,211,238,.8);
  animation:iload 1s cubic-bezier(.4,0,.2,1) forwards;}
@keyframes iload{to{width:100%;}}
#intro .i-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.32em;
  text-transform:uppercase;color:var(--primary);text-shadow:0 0 12px rgba(34,211,238,.5);}
@media(prefers-reduced-motion:reduce){#intro{display:none;}}

/* —— 雷姆终端彩蛋 toast —— */
.rem-toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,16px);z-index:9998;
  font-family:var(--font-mono);font-size:14px;color:var(--heading);
  background:#0c1120;border:1px solid rgba(34,211,238,.45);border-radius:10px;
  padding:12px 20px;box-shadow:var(--glow),var(--shadow);opacity:0;pointer-events:none;
  transition:opacity .3s ease,transform .3s ease;max-width:88vw;}
.rem-toast.show{opacity:1;transform:translate(-50%,0);}
.rem-toast .p{color:var(--primary);font-weight:700;margin-right:8px;}

/* —— 博客：筛选 chips + 标签 + 日期 —— */
.filter-chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 26px;}
.chip{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--text-soft);
  background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:7px 15px;cursor:pointer;transition:.15s;}
.chip:hover{border-color:var(--primary);color:var(--primary);}
.chip.active{background:var(--primary);border-color:var(--primary);color:#04222b;box-shadow:var(--glow);}
.entry .when{font-family:var(--font-mono);font-size:12px;color:var(--text-soft);letter-spacing:.04em;}
.post-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:13px;}
.post-tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--primary);
  background:var(--primary-soft);border:1px solid rgba(34,211,238,.25);border-radius:6px;padding:3px 9px;}
.blog-empty{color:var(--text-soft);padding:30px 0;font-size:15px;}