/* 嵌入式教学台：文档式布局（左侧章节 / 中间正文 / 右侧本章目录），沿用站点的深色仪器台配色。 */

.docs-body{background:radial-gradient(ellipse at 85% -10%,#2a463d22,transparent 45%),#101b1f}
.skip{position:absolute;left:16px;top:-60px;background:var(--mint);color:#10211c;padding:10px 14px;z-index:60;border-radius:4px}
.skip:focus{top:10px}

/* 顶栏 */
.docs-top{position:sticky;top:0;z-index:40;height:56px;display:flex;align-items:center;gap:14px;padding:0 20px;background:#101b1fee;backdrop-filter:blur(10px);border-bottom:1px solid #2a3f3d}
.docs-brand{font-size:21px;font-weight:650;letter-spacing:-.6px;color:var(--text);text-decoration:none}
.docs-brand span{color:var(--mint)}
.docs-badge{font-size:11px;color:var(--muted);border-left:1px solid #33474a;padding-left:14px}
.docs-links{margin-left:auto;display:flex;gap:18px;font-size:11px}
.docs-links a{color:var(--muted);text-decoration:none}
.docs-links a:hover{color:var(--mint)}
.docs-progress{font:10px/1 Consolas,monospace;color:#7e968d;border:1px solid #2f4744;border-radius:99px;padding:5px 10px}
.side-toggle{display:none;background:none;border:1px solid #3a5350;color:var(--text);border-radius:4px;font-size:14px;padding:4px 9px;cursor:pointer}

/* 三栏 */
.docs-shell{display:grid;grid-template-columns:280px minmax(0,1fr) 210px;max-width:1500px;margin:0 auto;align-items:start}
.docs-side{position:sticky;top:56px;height:calc(100vh - 56px);overflow-y:auto;border-right:1px solid #253837;padding:18px 12px 40px}
.side-search input{width:100%;background:#0c171b;border:1px solid #2f4744;border-radius:4px;color:var(--text);font-size:11px;padding:8px 10px}
.side-search input::placeholder{color:#5d7770}
.side-progress{display:flex;justify-content:space-between;font:10px/1 Consolas,monospace;color:#78958b;padding:12px 4px 6px;border-bottom:1px solid #223534;margin-bottom:8px}
.side-group{margin:10px 0 2px}
.side-group-title{font:9px/1.6 Consolas,monospace;letter-spacing:2px;color:#5f7d74;padding:6px 8px 2px}
.side-chapter-link{display:block;font-size:12px;font-weight:600;color:#c3d3ca;padding:6px 8px;text-decoration:none;border-radius:4px}
.side-chapter-link:hover{background:#17282b}
.side-chapter.active .side-chapter-link{color:var(--mint)}
.side-sections{list-style:none;margin:0;padding:0 0 4px 8px;display:block}

.side-sections li a{display:flex;gap:8px;align-items:flex-start;font-size:11.5px;line-height:1.6;color:#93aaa1;text-decoration:none;padding:5px 8px;border-radius:4px;border-left:2px solid transparent}
.side-sections li a:hover{background:#16262a;color:#d6e4da}
.side-sections li.active a{color:var(--mint);background:#172b27;border-left-color:var(--mint)}
.side-sections .dot{width:6px;height:6px;border-radius:50%;border:1px solid #4a655e;margin-top:6px;flex:none}
.side-sections .dot.done{background:var(--mint);border-color:var(--mint)}

/* 正文 */
.docs-main{min-width:0;padding:30px 46px 60px}
.doc-crumbs{display:flex;gap:8px;font:10px/1.6 Consolas,monospace;color:#69857c;margin-bottom:18px}
.doc-crumbs a{color:#8fb3a5;text-decoration:none}
.doc-crumbs b{color:#b9ccc2;font-weight:500}
.doc-head{border-bottom:1px solid #243736;padding-bottom:18px;margin-bottom:26px}
.doc-head h1{font-size:clamp(24px,2.6vw,34px);line-height:1.45;font-weight:580;letter-spacing:-.5px;margin:10px 0 10px}
.doc-kicker{margin:0;font-size:13px;color:#8fa89e}
.doc-body{font-size:14.5px;line-height:2;color:#c6d4cb}
.doc-body h3{font-size:19px;margin:34px 0 10px;font-weight:560;color:#e4ede4}
.doc-body h4{font-size:14px;margin:22px 0 8px;color:#d7e6dc;letter-spacing:.2px}
.doc-body p{margin:0 0 14px}
.doc-body strong{color:#eef6ec;font-weight:600}
.doc-body em{color:#d9bf98;font-style:normal}
.doc-body ul,.doc-body ol{margin:0 0 16px;padding-left:22px}
.doc-body li{margin:5px 0}
.doc-body code{font:12.5px/1.7 Consolas,monospace;background:#0c171b;border:1px solid #26393d;border-radius:3px;padding:1px 5px;color:#cfe1c4}
.doc-body a{color:var(--mint)}

/* 提示块 */
.note{border-left:2px solid #52715d;background:#16261f;padding:12px 16px;border-radius:0 5px 5px 0;font-size:13px;line-height:1.9;margin:16px 0;color:#c3d8c8}
.note.warn{border-color:#b08a52;background:#241f17;color:#e2cba4}
.note.tip{border-color:#4f8f7c;background:#132a26;color:#bfe0d2}
.note strong{color:inherit}

/* 表格 */
.tbl{width:100%;border-collapse:collapse;margin:16px 0 20px;font-size:12.5px}
.tbl th,.tbl td{border:1px solid #2b403d;padding:9px 11px;text-align:left;vertical-align:top;line-height:1.75}
.tbl th{background:#16272b;color:#cfe1c4;font-weight:600;font-size:12px}
.tbl td{color:#b9cbc0}
.tbl tr:nth-child(even) td{background:#13202399}

/* 步骤与流程 */
.steps{counter-reset:step;list-style:none;padding-left:0}
.steps li{counter-increment:step;position:relative;padding-left:34px;margin:10px 0}
.steps li::before{content:counter(step);position:absolute;left:0;top:2px;width:22px;height:22px;border-radius:50%;border:1px solid #4f7a63;color:var(--mint);font:11px/22px Consolas,monospace;text-align:center}
.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:18px 0}
.flow>div{border:1px solid #2b403d;border-radius:5px;background:#132226;padding:12px}
.flow b{display:block;font-size:12px;color:var(--mint);margin-bottom:6px}
.flow span{font-size:11px;line-height:1.75;color:#9fb3a8}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0}
.diagram{border:1px solid #2b403d;border-radius:5px;background:#0f1c1f;padding:8px}
.diagram svg{width:100%;height:auto;display:block}

/* 代码 */
.code{margin:14px 0 18px;background:#0b1518;border:1px solid #26393d;border-radius:5px;padding:14px 16px;overflow:auto}
.code code{font:12.5px/1.85 Consolas,monospace;color:#c2d6cb;background:none;border:0;padding:0;white-space:pre}

/* 交互组件通用 */
[data-widget]{margin:20px 0 24px}
.lab-chips{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:10px}
.lab-chips button{text-align:left;background:#132226;border:1px solid #2b403d;border-radius:5px;padding:10px 12px;color:var(--text);display:flex;flex-direction:column;gap:4px;cursor:pointer}
.lab-chips button.on{border-color:var(--mint);background:#193129}
.lab-chips strong{font-size:12px}
.lab-chips small{font-size:9.5px;color:#7e968d;font-family:Consolas,monospace}
.lab-note{font-size:11px;color:#7e968d;line-height:1.8;margin:0 0 14px}

.pinwall{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.pin-row{display:flex;align-items:center;gap:10px}
.pin-port{width:26px;font:10px/1 Consolas,monospace;color:#7e968d}
.pin-cells{display:flex;flex-wrap:wrap;gap:4px}
.pin{width:34px;height:30px;border-radius:3px;border:1px solid #2c4644;background:#152528;color:#b9c8bf;font:10px/1 Consolas,monospace;position:relative;cursor:pointer}
.pin:hover{border-color:#749e83}
.pin.on{border-color:var(--mint);background:#1d3a30;color:#eaf3e9}
.pin.warn{border-style:dashed;border-color:#6b5a3f}
.pin i{position:absolute;right:3px;top:3px;width:4px;height:4px;border-radius:50%;background:var(--gold)}

.cfg-row{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;padding:12px;background:#122024;border:1px solid #26393d;border-radius:5px}
.cfg-row label{display:flex;flex-direction:column;gap:5px;font-size:10px;color:#8ba99b}
.cfg-row select{min-width:170px;background:#0b1619;color:var(--text);border:1px solid #36504b;border-radius:3px;padding:7px 9px;font-size:11px}
.level-toggle{display:flex;align-items:center;gap:5px;font-size:10px;color:#8ba99b}
.level-toggle.off{opacity:.45}
.level-toggle button{min-width:34px;padding:7px 9px;border:1px solid #36504b;background:#0b1619;color:#b9c8bf;border-radius:3px;font-size:11px;cursor:pointer}
.level-toggle button.on{background:var(--mint);color:#18332c;border-color:var(--mint);font-weight:600}
.led-demo{display:flex;align-items:center;gap:10px;margin-left:auto}
.led-demo small{display:block;font-size:9px;color:#78958b}
.led-demo strong{font-size:11px;font-weight:500;color:#cfe1c4}
.led{width:20px;height:20px;border-radius:50%;background:#2b3a33;border:1px solid #3d5348;transition:all .25s}
.led.lit{background:#ffe7a8;border-color:#ffd879;box-shadow:0 0 14px 4px rgba(255,216,121,.55)}
.led.big{width:40px;height:40px}
.warn-list{margin:12px 0;padding:10px 14px 10px 28px;border-left:2px solid #b08a52;background:#241f17;color:#e2cba4;font-size:11.5px;line-height:1.9;border-radius:0 4px 4px 0}

.triple{display:grid;grid-template-columns:1fr;gap:18px;margin-top:16px}
.triple h4{font-size:12px;margin:0 0 8px;color:#cfe1c4}
.kv{margin:0;font-size:11.5px}
.kv>div{display:grid;grid-template-columns:96px minmax(0,1fr);gap:10px;padding:6px 0;border-bottom:1px dashed #2b403d}
.kv dt{color:#8ba99b}
.kv dd{margin:0;color:#d7e6dc;text-align:left}
.reg-list{display:flex;flex-direction:column;gap:8px}
.reg{background:#0b1518;border:1px solid #26393d;border-radius:4px;padding:9px}
.reg-head{display:flex;justify-content:space-between;font:11px/1.5 Consolas,monospace;color:#9dbbb2}
.reg-head b{color:var(--gold)}
.reg-bits{margin:5px 0 3px}
.reg-bits code{font:9.5px/1.6 Consolas,monospace;color:#5c7670;letter-spacing:.4px;word-break:break-all}
.reg-bits b{color:var(--mint);font-weight:700}
.reg p{margin:0;font-size:10px;color:#7e968d;line-height:1.6}

/* 波形实验 */
.lab-grid{display:grid;grid-template-columns:1fr;gap:12px;align-items:start}
.canvas-wrap{border:1px solid #26393d;border-radius:5px;overflow:hidden;background:#0b1518;min-width:0}
.canvas-wrap canvas{display:block;width:100%}
.lab-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 16px;align-items:start}
.lab-controls label{display:flex;flex-direction:column;gap:4px;font-size:10px;color:#8ba99b}
.lab-controls output{font:11px/1 Consolas,monospace;color:var(--mint);order:-1}
.lab-controls select{background:#0b1619;color:var(--text);border:1px solid #36504b;border-radius:3px;padding:6px 8px;font-size:11px}
.lab-controls .check{flex-direction:row;align-items:center;gap:6px;font-size:11px;color:#b9cbc0;grid-column:1/-1}`r`n.lab-controls .big-count{grid-column:1/-1}`r`n.lab-controls .pwm-led{grid-column:1/-1}
input[type=range]{width:100%;accent-color:#acdfc4}
.lab-result{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:12px}
.lab-result>div,.pwm-readout>div,.nvic-latency>div,.cnt-readout>div{background:#122024;border:1px solid #26393d;border-radius:4px;padding:9px 11px}
.lab-result small,.pwm-readout small,.nvic-latency small,.cnt-readout small{display:block;font-size:9px;color:#78958b;letter-spacing:.5px}
.lab-result strong,.pwm-readout strong,.nvic-latency strong,.cnt-readout strong{font-size:14px;font-weight:600;display:block;margin-top:3px}
.lab-result strong.ok,.big-count strong.ok{color:var(--mint)}
.lab-result strong.bad,.big-count strong.bad{color:#efa78e}
.lab-result p{margin:3px 0 0;font-size:10px;line-height:1.7;color:#9bb0a7}
.big-count{margin-top:4px;border:1px solid #26393d;border-radius:4px;padding:10px;background:#122024}
.big-count small{display:block;font-size:9px;color:#78958b}
.big-count strong{font-size:30px;line-height:1.2;color:var(--mint)}
.pwm-readout,.nvic-latency{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:12px}`r`n.cnt-readout{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.pwm-led{display:flex;align-items:center;gap:10px;font-size:10px;color:#8ba99b;margin-top:6px}
.warn-inline{grid-column:1/-1;border-left:2px solid #b08a52;background:#241f17;color:#e2cba4;font-size:11px;padding:8px 12px;border-radius:0 4px 4px 0}

/* EXTI 线 */
.exti-pins{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:14px}
.exti-pins button{text-align:left;background:#132226;border:1px solid #2b403d;border-radius:5px;padding:10px 12px;color:var(--text);cursor:pointer;display:flex;flex-direction:column;gap:3px}
.exti-pins button.on{border-color:var(--mint);background:#193129}
.exti-pins b{font-size:13px;color:var(--mint)}
.exti-pins small{font-size:10px;color:#8ba99b}
.exti-flow{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:12px 0}
.exti-flow .box{border:1px solid #2b403d;border-radius:5px;background:#132226;padding:8px 12px;font-size:11px;color:#a9c0b6;text-align:center}
.exti-flow .box b{display:block;font-size:12px;color:#d7e6dc;margin-top:2px}
.exti-flow .box.accent{border-color:#52715d;background:#16281f}
.exti-flow .arrow{color:#52715d}

/* NVIC */
.preset-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.preset-row button{background:#132226;border:1px solid #2b403d;border-radius:99px;color:#b9cbc0;font-size:11px;padding:6px 12px;cursor:pointer}
.preset-row button:hover{border-color:#749e83;color:#e4ede4}

/* FAQ */
.faq-toolbar{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}
.faq-toolbar input{background:#0b1619;border:1px solid #2f4744;border-radius:4px;color:var(--text);padding:10px 12px;font-size:12px}
.faq-cats{display:flex;flex-wrap:wrap;gap:6px}
.faq-cats button{background:#132226;border:1px solid #2b403d;border-radius:99px;color:#a9c0b6;font-size:11px;padding:5px 11px;cursor:pointer}
.faq-cats button.on{background:#1d3a30;border-color:var(--mint);color:#dff2e2}
.faq-list{display:flex;flex-direction:column;gap:8px}
.faq-item{border:1px solid #26393d;border-radius:5px;background:#122024}
.faq-item summary{list-style:none;cursor:pointer;padding:12px 14px;font-size:12.5px;color:#d7e6dc;display:flex;gap:9px;align-items:baseline}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';margin-left:auto;color:#6f8c84;font-family:Consolas,monospace}
.faq-item[open] summary::after{content:'–'}
.faq-item[open] summary{border-bottom:1px solid #26393d}
.faq-cat{font:9px/1 Consolas,monospace;color:#8ba99b;border:1px solid #2f4744;border-radius:3px;padding:3px 5px;flex:none}
.faq-body{padding:10px 16px 14px;font-size:12px;line-height:1.9;color:#b9cbc0}
.faq-body p{margin:4px 0}
.faq-body ol{margin:6px 0 0;padding-left:20px}
.faq-body li{margin:3px 0}

/* 题库 */
.quiz-toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
.quiz-filter{display:flex;flex-wrap:wrap;gap:5px}
.quiz-filter button{background:#132226;border:1px solid #2b403d;border-radius:99px;color:#a9c0b6;font-size:10.5px;padding:4px 10px;cursor:pointer}
.quiz-filter button.on{background:#1d3a30;border-color:var(--mint);color:#dff2e2}
.quiz-score{font-size:11px;color:#a9c0b6;margin-left:auto}
.quiz-toolbar .button{font-size:10.5px;padding:6px 10px;min-height:0}
.quiz-list{display:flex;flex-direction:column;gap:12px}
.quiz-item{border:1px solid #26393d;border-radius:5px;padding:12px 14px;background:#122024}
.quiz-item.ok{border-color:#3f6b52}
.quiz-item.bad{border-color:#6b4038}
.quiz-item header{display:flex;gap:9px;align-items:baseline}
.quiz-item .sec{font:9px/1 Consolas,monospace;color:#78958b;border:1px solid #2f4744;border-radius:3px;padding:3px 5px;flex:none}
.quiz-item h3{font-size:12.5px;font-weight:500;margin:0;line-height:1.75;color:#d7e6dc}
.quiz-opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;margin-top:10px}
.quiz-opts button{text-align:left;padding:8px 10px;font-size:11px;background:#0e1b1f;color:#b9c8bf;border:1px solid #2f4744;border-radius:3px;line-height:1.5;cursor:pointer}
.quiz-opts button:hover{border-color:#749e83}
.quiz-opts button.picked{border-color:#c9b07a}
.quiz-opts button.right{border-color:var(--mint);background:#1a3529;color:#dff2e2}
.quiz-why{margin:9px 0 0;font-size:11px;line-height:1.8;padding:8px 11px;border-radius:3px}
.quiz-why.ok{background:#172b22;color:#b9dcc5}
.quiz-why.bad{background:#2a201d;color:#e6b39e}

/* 翻页与页脚 */
.doc-pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:44px 0 10px;border-top:1px solid #243736;padding-top:20px}
.pager{display:flex;flex-direction:column;gap:5px;border:1px solid #2b403d;border-radius:5px;padding:12px 14px;text-decoration:none;background:#122024}
.pager:hover{border-color:#52715d}
.pager small{font-size:9px;color:#78958b;letter-spacing:1px}
.pager span{font-size:12px;color:#d7e6dc}
.pager.next{text-align:right}
.docs-foot{font-size:11px;line-height:1.95;color:#8fa89e;border:1px solid #2b403d;border-radius:5px;background:#122024;padding:14px 16px;margin-top:26px}
.docs-foot strong{color:#cfe1c4}

/* 右侧目录 */
.docs-toc{position:sticky;top:56px;max-height:calc(100vh - 56px);overflow-y:auto;padding:22px 18px 40px;border-left:1px solid #253837}
.toc-title{font:9px/1.6 Consolas,monospace;letter-spacing:2px;color:#5f7d74;margin-bottom:10px}
.docs-toc ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.docs-toc a{display:block;font-size:11px;line-height:1.7;color:#8ba99b;text-decoration:none;padding:4px 8px;border-left:2px solid transparent}
.docs-toc a:hover{color:#d7e6dc}
.docs-toc li.active a{color:var(--mint);border-left-color:var(--mint);background:#16281f}

/* 响应式 */
@media(max-width:1240px){.docs-shell{grid-template-columns:250px minmax(0,1fr)}.docs-toc{display:none}}
@media(max-width:900px){
  .side-toggle{display:block}
  .docs-links{display:none}
  .docs-shell{grid-template-columns:1fr}
  .docs-side{position:fixed;left:0;top:56px;bottom:0;width:280px;z-index:45;background:#0f1a1ee8;backdrop-filter:blur(8px);transform:translateX(-102%);transition:transform .2s;height:auto}
  .docs-shell.side-open .docs-side{transform:none}
  .docs-main{padding:22px 16px 50px}
  .doc-body{font-size:13.5px}
  .triple{grid-template-columns:1fr}
  .lab-grid{grid-template-columns:1fr}
  .lab-chips{grid-template-columns:1fr}
  .flow{grid-template-columns:1fr 1fr}
  .two-col{grid-template-columns:1fr}
  .lab-result,.pwm-readout,.nvic-latency{grid-template-columns:repeat(2,minmax(0,1fr))}
  .quiz-opts{grid-template-columns:1fr}
  .doc-pager{grid-template-columns:1fr}
  .pager.next{text-align:left}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---------- C 语言第一课 ---------- */
.c-output{margin:-6px 0 18px;border-left:2px solid #4f7a63;background:#12211c;padding:10px 14px;border-radius:0 4px 4px 0}
.c-output b{display:block;font:9px/1.6 Consolas,monospace;letter-spacing:1.4px;color:#7e968d;margin-bottom:5px}
.c-output pre{margin:0;font:12px/1.75 Consolas,monospace;color:#bfe0c8;white-space:pre-wrap;word-break:break-word}
.printf-lab{border:1px solid #26393d;border-radius:6px;background:#101f23;padding:14px}
.printf-inputs{display:grid;grid-template-columns:1.1fr 1fr auto;gap:12px;align-items:end}
.printf-inputs label{display:flex;flex-direction:column;gap:5px;font-size:10px;color:#8ba99b}
.printf-inputs input[type=text]{background:#0b1619;border:1px solid #36504b;border-radius:3px;color:#e4ede4;font:13px/1.4 Consolas,monospace;padding:8px 10px}
.printf-inputs .check{flex-direction:row;align-items:center;gap:6px;font-size:11px;color:#b9cbc0;padding-bottom:8px}
.printf-presets{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
.printf-presets button{background:#132226;border:1px solid #2b403d;border-radius:99px;color:#a9c0b6;font:11px/1 Consolas,monospace;padding:5px 10px;cursor:pointer}
.printf-presets button:hover{border-color:#749e83;color:#e4ede4}
.printf-out{background:#0a1417;border:1px solid #2b403d;border-radius:4px;padding:12px 14px;overflow:auto}
.printf-out pre{margin:0;font:13px/1.7 Consolas,monospace;color:#e7d7a8;white-space:pre}
.printf-out pre.bad{color:#e6b39e;font-size:12px;white-space:pre-wrap}
.printf-lab .quiet{font-size:11px;color:#7e968d;margin:8px 0 0}
@media(max-width:760px){.printf-inputs{grid-template-columns:1fr}}