/* ============================================================
   HCIE-DataCom 数通专家课件 · 统一样式
   深色投影主题 / 华为红品牌色 / 1280×720 幻灯片
   ============================================================ */
:root{
  --brand:#e02020;            /* 华为红 */
  --brand-dark:#a31515;
  --brand-soft:rgba(224,32,32,.14);
  --bg:#10151b;               /* 全局背景 */
  --bg2:#0b0f13;
  --panel:#1a222c;            /* 面板 */
  --panel2:#212c38;
  --line:#2c3947;
  --fg:#e9eef4;               /* 正文 */
  --muted:#8fa0b3;            /* 次级文字 */
  --accent:#f5a623;           /* 强调橙 */
  --ok:#3ecf8e;               /* 正确/绿 */
  --info:#54a9ff;             /* 信息/蓝 */
  --code-bg:#0d1319;
  --mono:"JetBrains Mono","Cascadia Code",Consolas,"Courier New",monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;background:var(--bg2);overflow:hidden;
  font-family:"HarmonyOS Sans SC","Microsoft YaHei UI","PingFang SC","Segoe UI",sans-serif;
  color:var(--fg);-webkit-font-smoothing:antialiased}

/* ---------- 幻灯片舞台 ---------- */
#stage{position:fixed;inset:0;background:
  radial-gradient(1200px 700px at 70% -10%,rgba(84,169,255,.06),transparent 60%),
  radial-gradient(1000px 600px at 10% 110%,rgba(224,32,32,.05),transparent 55%),
  var(--bg);}
.deck{position:absolute;left:50%;top:50%;width:1280px;height:720px;
  transform-origin:center center;background:var(--bg);
  box-shadow:0 30px 90px rgba(0,0,0,.55);outline:1px solid var(--line)}

/* ---------- 幻灯片 ---------- */
.slide{position:absolute;inset:0;padding:56px 72px 64px;display:none;
  flex-direction:column;background:var(--bg)}
.slide.active{display:flex}
.slide.active.anim{animation:slidein .38s ease both}
@keyframes slidein{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

.slide h2{font-size:38px;font-weight:800;letter-spacing:.5px;margin-bottom:6px;
  display:flex;align-items:center;gap:14px}
.slide h2::before{content:"";width:10px;height:34px;border-radius:3px;flex:0 0 auto;
  background:linear-gradient(180deg,var(--brand),#ff6a4d)}
.slide .subtitle{color:var(--muted);font-size:19px;margin:2px 0 20px 24px}
.body{flex:1;display:flex;flex-direction:column;gap:14px;min-height:0;overflow:hidden}
p,li{font-size:21px;line-height:1.55}
ul,ol{padding-left:26px}
li{margin:6px 0}
b,strong{color:#fff}
.hl{color:var(--brand);font-weight:700}
.hl2{color:var(--accent);font-weight:700}
.hl3{color:var(--info);font-weight:700}
.dim{color:var(--muted)}
code{font-family:var(--mono);font-size:.92em;background:#0d1319;border:1px solid var(--line);
  border-radius:5px;padding:1px 7px;color:#7ee0a3}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:12px;
  padding:16px 20px;font-family:var(--mono);font-size:18px;line-height:1.5;
  color:#cfe3d8;overflow:auto;flex-shrink:0}
pre .c{color:#5c6f80}      /* 注释 */
pre .k{color:#6fb2ff}      /* 关键字/命令 */
pre .v{color:#f5a623}      /* 参数值 */
pre b,pre strong{color:#fff}
pre.t{font-size:16.5px}
pre.tiny{font-size:15px;line-height:1.45;padding:13px 16px}

/* ---------- 封面页 ---------- */
.slide.title-slide{justify-content:center;padding:0 96px;
  background:
   radial-gradient(900px 500px at 85% 15%,rgba(224,32,32,.16),transparent 60%),
   radial-gradient(700px 420px at 8% 90%,rgba(84,169,255,.10),transparent 60%),
   linear-gradient(135deg,#131a22,#0d1218)}
.title-slide .kicker{color:var(--brand);font-weight:800;font-size:22px;letter-spacing:6px;margin-bottom:18px}
.title-slide h1{font-size:64px;font-weight:900;line-height:1.15;margin-bottom:20px}
.title-slide .desc{font-size:24px;color:var(--muted);max-width:880px;line-height:1.6}
.title-slide .chips{margin-top:38px;display:flex;gap:12px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:rgba(255,255,255,.04);border-radius:999px;
  padding:7px 18px;font-size:17px;color:var(--muted)}
.chip b{color:var(--fg)}
.title-slide .foot{position:absolute;bottom:40px;left:96px;right:96px;display:flex;
  justify-content:space-between;color:#54657a;font-size:16px;border-top:1px solid var(--line);padding-top:16px}

/* ---------- 分节页 ---------- */
.slide.section-slide{justify-content:center;gap:8px;
  background:
   radial-gradient(700px 420px at 88% 80%,rgba(224,32,32,.12),transparent 60%),
   linear-gradient(160deg,#121922 0%,#0e131a 100%)}
.secnum{font-size:110px;font-weight:900;color:transparent;
  -webkit-text-stroke:2px rgba(224,32,32,.55);line-height:1}
.section-slide h2{font-size:52px;justify-content:flex-start}
.section-slide .sub{font-size:22px;color:var(--muted);margin-top:6px}
.section-slide .plines{margin-top:26px;display:flex;gap:10px;flex-wrap:wrap}

/* ---------- 布局组件 ---------- */
.cols{display:flex;gap:22px;flex:1;min-height:0}
.col{flex:1;min-width:0;display:flex;flex-direction:column;gap:14px}
.col.narrow{flex:.72}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}

.box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 22px}
.box>h3{font-size:21px;margin-bottom:10px;color:#fff;display:flex;align-items:center;gap:10px}
.box>h3::before{content:"";width:8px;height:8px;border-radius:2px;background:var(--brand);transform:rotate(45deg)}
.box.accent{border-left:4px solid var(--accent)}
.box.info{border-left:4px solid var(--info)}
.box.ok{border-left:4px solid var(--ok)}

.note{background:var(--brand-soft);border:1px solid rgba(224,32,32,.4);border-left:5px solid var(--brand);
  border-radius:10px;padding:14px 20px;font-size:20px;line-height:1.55}
.note .nlab{color:var(--brand);font-weight:800;margin-right:8px}
.tip{background:rgba(84,169,255,.09);border:1px solid rgba(84,169,255,.35);border-left:5px solid var(--info);
  border-radius:10px;padding:14px 20px;font-size:20px;line-height:1.55}
.tip .nlab{color:var(--info);font-weight:800;margin-right:8px}

.tag{display:inline-block;font-size:15px;font-weight:700;padding:3px 12px;border-radius:999px;
  background:var(--brand-soft);color:#ff6b6b;border:1px solid rgba(224,32,32,.4);letter-spacing:1px;vertical-align:middle}
.tag.b{background:rgba(84,169,255,.12);color:#7db8ff;border-color:rgba(84,169,255,.4)}
.tag.g{background:rgba(62,207,142,.12);color:#5fe0a5;border-color:rgba(62,207,142,.4)}
.tag.o{background:rgba(245,166,35,.12);color:#ffc257;border-color:rgba(245,166,35,.4)}

/* ---------- 表格 ---------- */
table{border-collapse:collapse;width:100%;font-size:19px}
th,td{border:1px solid var(--line);padding:9px 13px;text-align:left;vertical-align:top;line-height:1.45}
th{background:var(--panel2);color:#fff;font-weight:700;white-space:nowrap}
td b{color:#fff}
tr:nth-child(even) td{background:rgba(255,255,255,.022)}
table.compact{font-size:17px}
table.tiny{font-size:15.5px}
table.tiny th,table.tiny td{padding:6px 9px}

/* ---------- 步骤条 / 流程 ---------- */
.seq{display:flex;gap:10px;align-items:stretch}
.seq .step{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:12px;
  padding:12px 14px;text-align:center}
.seq .step .st{font-size:17px;font-weight:800;color:var(--brand)}
.seq .step .sd{font-size:16.5px;color:var(--muted);margin-top:4px;line-height:1.4}
.seq .arrow{align-self:center;color:var(--brand);font-size:26px;font-weight:900}

/* ---------- 思考题 / 实验页 ---------- */
.slide.quiz-slide h2::before{background:linear-gradient(180deg,var(--accent),#ff6a4d)}
.slide.quiz-slide{background:
  radial-gradient(800px 460px at 90% 10%,rgba(245,166,35,.08),transparent 60%),var(--bg)}
.qlist{counter-reset:q;display:flex;flex-direction:column;gap:12px}
.qlist>div{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 18px;font-size:20px}
.qlist>div::before{counter-increment:q;content:"Q" counter(q);
  display:inline-block;color:var(--accent);font-weight:900;margin-right:10px}
.slide.lab-slide h2::before{background:linear-gradient(180deg,var(--ok),#27ae60)}
.slide.lab-slide{background:
  radial-gradient(800px 460px at 90% 10%,rgba(62,207,142,.08),transparent 60%),var(--bg)}
.lab-meta{display:flex;gap:10px;margin:4px 0 16px 24px;flex-wrap:wrap}

/* ---------- 小结页 ---------- */
.sumgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.sumgrid .box{padding:13px 18px;font-size:19px}
.sumgrid .box b{display:block;margin-bottom:4px;font-size:19.5px}

/* ---------- SVG 图示 ---------- */
figure svg{display:block;width:100%;height:auto}
svg text{font-family:"HarmonyOS Sans SC","Microsoft YaHei",sans-serif}
figcaption{color:var(--muted);font-size:16px;text-align:center;margin-top:6px}
.svg-dark{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px}

/* ---------- 页脚水印 ---------- */
.watermark{position:absolute;bottom:20px;right:28px;font-size:13px;color:#43536a;letter-spacing:1px}

/* ---------- chrome（进度条/页码/目录） ---------- */
#progress{position:fixed;top:0;left:0;height:4px;background:linear-gradient(90deg,var(--brand),#ff6a4d);
  width:0;z-index:60;transition:width .25s;border-radius:0 2px 2px 0}
#counter{position:fixed;bottom:14px;right:22px;z-index:60;color:#6d7f94;font-size:15px;
  font-family:var(--mono);background:rgba(13,19,25,.75);border:1px solid var(--line);
  border-radius:8px;padding:4px 12px}
#btn-menu{position:fixed;top:14px;right:20px;z-index:60;cursor:pointer;color:#6d7f94;
  background:rgba(13,19,25,.75);border:1px solid var(--line);border-radius:8px;padding:5px 14px;
  font-size:15px;user-select:none}
#btn-menu:hover{color:#fff;border-color:#44586e}
#btn-prev,#btn-next{position:fixed;top:50%;transform:translateY(-50%);z-index:60;width:44px;height:76px;
  border:1px solid var(--line);background:rgba(13,19,25,.6);color:#5c7188;font-size:24px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;border-radius:10px;user-select:none}
#btn-prev{left:10px}#btn-next{right:10px}
#btn-prev:hover,#btn-next:hover{color:#fff;border-color:#44586e;background:rgba(26,34,44,.9)}
#btn-full{position:fixed;bottom:14px;right:118px;z-index:60;color:#6d7f94;cursor:pointer;
  background:rgba(13,19,25,.75);border:1px solid var(--line);border-radius:8px;padding:4px 12px;font-size:15px}
#help{position:fixed;bottom:14px;left:22px;z-index:60;color:#43536a;font-size:13px;letter-spacing:.5px}
#help b{color:#6d7f94;font-family:var(--mono)}
#toc{position:fixed;inset:0;background:rgba(6,9,12,.9);z-index:70;display:none;padding:60px 90px;
  overflow:auto;backdrop-filter:blur(4px)}
#toc.open{display:block}
#toc h3{font-size:26px;margin-bottom:18px;color:#fff}
#toc .toclist{display:grid;grid-template-columns:1fr 1fr;gap:8px 26px}
#toc .titem{display:flex;gap:10px;align-items:baseline;padding:7px 12px;border-radius:8px;cursor:pointer;
  color:#c3cfda;font-size:18px}
#toc .titem:hover{background:var(--brand-soft);color:#fff}
#toc .titem.cur{background:var(--brand-soft);color:#fff;border-left:3px solid var(--brand)}
#toc .tno{color:var(--brand);font-family:var(--mono);font-weight:800;min-width:34px}

/* ---------- 站点页脚（学习笔记 · 备案信息） ---------- */
#site-footer{position:fixed;bottom:15px;left:50%;transform:translateX(-50%);z-index:60;
  color:#43536a;font-size:12.5px;letter-spacing:.5px;white-space:nowrap;user-select:none}
#site-footer a{color:#6d7f94;text-decoration:none}
#site-footer a:hover{color:#fff}

/* ---------- 打印 ---------- */
@media print{
  html,body{overflow:visible;background:#fff}
  #stage{position:static;background:#fff}
  .deck{position:static;transform:none!important;width:1280px;height:auto;box-shadow:none;outline:none}
  .slide{display:flex!important;position:relative;inset:auto;width:1280px;height:720px;
    page-break-after:always;break-after:page;animation:none}
  #progress,#counter,#btn-menu,#btn-prev,#btn-next,#help,#toc,#btn-full,#site-footer{display:none!important}
}