/* ==========================================================================
   练二 · 使用手册模板 v2（LIANER Manual）
   品牌依据：lianer-official-site/DESIGN_SPEC.md —— 红得克制（红只给章号、标语句号、少数强调），
   黑白为骨，留白为王。同一份 HTML：屏幕 = 手机优先网页；打印 = 120×213mm 手机屏比例 PDF。
   ========================================================================== */

:root{
  --red:#E60012;
  --ink:#111111;
  --text:#1F1F1F;
  --muted:#6B6B6B;
  --faint:#A3A3A3;
  --line:#E6E6E6;
  --soft:#F6F6F6;
  --ok:#16A34A;
  --warn:#B45309;
  --err:#DC2626;
  --font:"PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,"Helvetica Neue",sans-serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:#EFEFEF;color:var(--text);font:16px/1.75 var(--font);counter-reset:chapter}
img{max-width:100%}
b,strong{font-weight:600;color:var(--ink)}
.r{color:var(--red)}
.doc{max-width:720px;margin:0 auto;background:#fff}

/* ---------- 网页顶栏 / 回到顶部（只在屏幕上显示） ---------- */
html{scroll-behavior:smooth;scroll-padding-top:52px}
.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:12px;height:48px;padding:0 16px;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.tb-brand img{display:block;height:16px}
.tb-title{flex:1;font-size:13.5px;font-weight:600;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tb-pdf{flex:none;font-size:12px;font-weight:700;letter-spacing:.08em;color:#fff;background:var(--ink);padding:6px 12px;border-radius:999px;text-decoration:none}
.totop{position:fixed;right:16px;bottom:22px;width:40px;height:40px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;text-decoration:none;opacity:.85;z-index:9}

/* ---------- 封面：上半照片（只放 logo），下半黑色信息面板 ---------- */
.cover{color:#fff;background:var(--ink)}
.cover-photo{position:relative;height:300px;background:url(assets/cover-wide.jpg) center 40%/cover no-repeat}
.cover-photo::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.45) 0%,rgba(0,0,0,0) 45%,rgba(17,17,17,.95) 100%)}
.cover-logo{position:absolute;left:24px;top:24px;width:124px;z-index:1}
.cover-panel{padding:6px 24px 30px}
.cover-eyebrow{font-size:10.5px;letter-spacing:.24em;color:rgba(255,255,255,.55);text-transform:uppercase}
.cover-eyebrow::before{content:"";display:inline-block;width:16px;height:2px;background:var(--red);vertical-align:middle;margin-right:8px}
.cover-kind{margin:16px 0 0;font-size:14px;letter-spacing:.18em;color:rgba(255,255,255,.75)}
.cover-title{margin:2px 0 0;font-size:42px;line-height:1.15;font-weight:800;letter-spacing:-.01em}
.cover-sub{margin:12px 0 0;font-size:14.5px;line-height:1.65;color:rgba(255,255,255,.72);max-width:24em}
.cover-facts{margin:26px 0 0;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);display:grid;gap:7px}
.cover-facts div{display:flex;gap:12px;align-items:baseline;font-size:13.5px;color:rgba(255,255,255,.88)}
.cover-facts i{font-style:normal;flex:none;width:3.6em;font-size:11px;letter-spacing:.14em;color:rgba(255,255,255,.4)}
.cover-slogan{margin-top:30px;font-size:24px;font-weight:700;letter-spacing:.02em;line-height:1.2}
.cover-slogan em{font-style:normal;color:var(--red)}
.cover-meta{margin-top:6px;font-size:11px;letter-spacing:.06em;color:rgba(255,255,255,.4)}

/* ---------- 目录 ---------- */
.toc{padding:30px 24px 26px}
.eyebrow{font-size:11px;font-weight:600;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}
.eyebrow::before{content:"";display:inline-block;width:14px;height:2px;background:var(--red);vertical-align:middle;margin-right:8px}
.toc h2{margin:6px 0 14px;font-size:24px;letter-spacing:-.01em;color:var(--ink)}
.toc ol{list-style:none;margin:0;padding:0}
.toc li a{display:flex;align-items:baseline;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);color:var(--text);text-decoration:none}
.toc .n{flex:none;width:1.9em;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.toc .t{flex:1;font-weight:600;color:var(--ink)}
.toc .t small{display:block;font-weight:400;font-size:12.5px;color:var(--muted)}
.toc .p{flex:none;color:var(--faint);font-size:13px;font-variant-numeric:tabular-nums}
.toc .p:empty{display:none}
.essentials{margin-top:22px;padding:16px 18px;border-radius:12px;background:var(--ink);color:#fff}
.essentials .eyebrow{color:rgba(255,255,255,.6)}
.essentials ul{margin:8px 0 0;padding:0;list-style:none}
.essentials li{padding:5px 0 5px 16px;position:relative;font-size:14.5px;line-height:1.6}
.essentials li::before{content:"";position:absolute;left:0;top:13px;width:6px;height:6px;border-radius:50%;background:var(--red)}
.essentials b{color:#fff}

/* ---------- 章 ---------- */
.chapter{counter-increment:chapter;counter-reset:fig;padding:26px 24px 20px}
.chapter + .chapter{border-top:1px solid var(--line)}
.chapter-head{margin-bottom:16px}
.ch-num{display:block;font-size:40px;line-height:1;font-weight:800;color:var(--red);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.chapter-head .eyebrow{margin-top:10px}
.chapter-head .eyebrow::before{background:var(--ink)}
.chapter-head h2{margin:2px 0 0;font-size:23px;line-height:1.3;letter-spacing:-.01em;color:var(--ink)}
.lead{margin:8px 0 0;font-size:15px;color:var(--muted)}
h3{margin:22px 0 8px;font-size:16px;color:var(--ink);display:flex;align-items:center;gap:8px}
h3 .step{flex:none;display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 6px;border-radius:11px;
  background:var(--ink);color:#fff;font-size:11.5px;font-weight:700;letter-spacing:.04em}
p{margin:0 0 10px}
.muted{color:var(--muted)}
.small{font-size:13.5px}
ul.dots{margin:6px 0 12px;padding:0;list-style:none}
ul.dots li{position:relative;padding:3px 0 3px 16px}
ul.dots li::before{content:"";position:absolute;left:2px;top:14px;width:5px;height:5px;border-radius:50%;background:var(--ink)}

/* ---------- 示意图 / 截图：不套外框，靠图号和留白分隔 ---------- */
.diagram{margin:14px 0 18px}
.diagram svg{display:block;width:100%;max-width:400px;height:auto;margin:0 auto}
figure{margin:14px 0 18px}
figure.shot img{display:block;width:100%;border-radius:10px;border:1px solid var(--line)}
figcaption,.diagram .cap{margin:8px 0 0;font-size:12.5px;line-height:1.55;color:var(--muted)}
figure.num figcaption::before,.diagram.num .cap::before{counter-increment:fig;content:"图 " counter(chapter) "-" counter(fig);
  font-weight:700;color:var(--ink);margin-right:8px}
.phones{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 12px;margin:12px 0 16px}
.phones figure{margin:0;width:calc(50% - 6px)}
.phones img{display:block;width:100%;border-radius:14px;border:1px solid var(--line)}
.phones figcaption{text-align:center;font-size:12px}
.phones figcaption b{display:block;color:var(--muted);font-size:10.5px;letter-spacing:.12em;font-weight:600}
figure.center{text-align:center}
figure.center img{width:66%;max-width:280px;margin:0 auto;border-radius:10px;border:1px solid var(--line)}

/* ---------- 提示框：统一浅灰底，左侧色条区分类型，不用大面积彩色 ---------- */
.callout{margin:14px 0;padding:11px 14px 11px 16px;border-radius:0 10px 10px 0;background:var(--soft);border-left:3px solid var(--ink);font-size:14.5px;line-height:1.7;color:var(--text)}
.callout .tag{display:block;margin-bottom:3px;font-size:11px;font-weight:700;letter-spacing:.14em;color:var(--ink)}
.callout p{margin:0 0 6px}
.callout p:last-child{margin:0}
.callout.cs{border-left-color:var(--red)}.callout.cs .tag{color:var(--red)}
.callout.warn{border-left-color:var(--warn)}.callout.warn .tag{color:var(--warn)}
.callout.tip{border-left-color:var(--faint)}.callout.tip .tag{color:var(--muted)}

/* ---------- 字段表 ---------- */
table.kv{width:100%;border-collapse:collapse;font-size:14.5px;margin:6px 0 14px}
table.kv td{padding:8px 4px;border-bottom:1px solid var(--line);vertical-align:top;color:var(--muted)}
table.kv td:first-child{width:5.4em;padding-right:10px;color:var(--ink);font-weight:600;white-space:nowrap}

/* ---------- 纪律卡 ---------- */
.rule{display:flex;gap:12px;margin:12px 0;padding:14px 14px 14px 0;border-bottom:1px solid var(--line)}
.rule:last-child{border-bottom:0}
.rule .n{flex:none;width:1.6em;font-size:20px;line-height:1.1;font-weight:800;color:var(--ink);font-variant-numeric:tabular-nums}
.rule h4{margin:0 0 4px;font-size:15.5px;color:var(--ink)}
.rule p{margin:0;font-size:14.5px;color:var(--muted)}

/* ---------- 问答 ---------- */
.qa{margin:0;padding:0;list-style:none}
.qa li{padding:11px 0;border-bottom:1px solid var(--line)}
.qa li:last-child{border:0}
.qa .q{display:flex;gap:8px;font-weight:600;color:var(--ink)}
.qa .q::before{content:"Q";flex:none;font-weight:800;color:var(--ink)}
.qa .a{display:flex;gap:8px;margin-top:2px;color:var(--muted);font-size:14.5px}
.qa .a::before{content:"A";flex:none;font-weight:800;color:var(--faint)}

/* ---------- 封底 ---------- */
.back{background:var(--ink);color:#fff;padding:40px 24px 32px;display:flex;flex-direction:column;min-height:420px}
.back-logo{width:140px}
.back-spacer{flex:1;min-height:40px}
.back-slogan{font-size:30px;font-weight:700;line-height:1.25}
.back-slogan em{font-style:normal;color:var(--red)}
.back-mission{margin-top:8px;font-size:14px;color:rgba(255,255,255,.55)}
.back-meta{margin-top:30px;padding-top:14px;border-top:1px solid rgba(255,255,255,.14);font-size:11.5px;line-height:1.8;color:rgba(255,255,255,.45)}

@media screen and (max-width:759px){
  .cover-eyebrow{font-size:9.5px;letter-spacing:.14em}
}
@media (min-width:760px){
  .doc{margin:28px auto;border-radius:18px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.08)}
  .cover-photo{height:360px}
  .cover-panel,.toc,.chapter{padding-left:44px;padding-right:44px}
  .back{padding-left:44px;padding-right:44px}
}

/* ==========================================================================
   打印 / PDF：120×213mm。页眉页脚用 @page 边距盒子（Chrome ≥131）。
   章节连排（不强制另起页），只保证章首和第一块不拆页——避免半页空白。
   ========================================================================== */
@page{
  size:120mm 213mm;
  margin:14mm 9mm 13mm;
  @top-left{content:"LIANER";font-family:"Helvetica Neue",Arial,sans-serif;font-size:7.5pt;font-weight:800;letter-spacing:.16em;color:#111;vertical-align:bottom;padding-bottom:3mm}
  /* 手册名由每份文档在 <head> 里声明：@page{@top-right{content:"…"}} */
  @top-right{font-family:"PingFang SC","Noto Sans SC",sans-serif;font-size:6.5pt;color:#A3A3A3;vertical-align:bottom;padding-bottom:3mm}
  @bottom-left{content:"练二一下，好状态。";font-family:"PingFang SC","Noto Sans SC",sans-serif;font-size:6.5pt;color:#A3A3A3;vertical-align:top;padding-top:3mm}
  @bottom-right{content:counter(page,decimal-leading-zero);font-family:"Helvetica Neue",Arial,sans-serif;font-size:8pt;font-weight:700;color:#111;vertical-align:top;padding-top:2.6mm}
}
@page full{margin:0;@top-left{content:none}@top-right{content:none}@bottom-left{content:none}@bottom-right{content:none}}
@page toc{@top-right{content:none}}

@media print{
  html,body{background:#fff;font-size:10pt;line-height:1.65}
  .topbar,.totop{display:none}
  .doc{max-width:none;margin:0;border-radius:0;box-shadow:none}
  .cover{page:full;width:120mm;height:213mm;display:flex;flex-direction:column;break-after:page}
  .cover-photo{height:96mm;background-image:url(assets/cover.jpg);background-position:center 55%}
  .cover-logo{left:9mm;top:9mm;width:30mm}
  .cover-panel{flex:1;padding:4mm 9mm 10mm;display:flex;flex-direction:column}
  .cover-eyebrow{font-size:6.5pt}
  .cover-kind{font-size:9pt;margin-top:4mm}
  .cover-title{font-size:27pt}
  .cover-sub{font-size:9pt}
  .cover-facts{margin-top:auto;padding-top:4mm}
  .cover-facts div{font-size:8.5pt}
  .cover-facts i{font-size:6.5pt}
  .cover-slogan{margin-top:6mm;font-size:16pt}
  .cover-meta{font-size:6.5pt}
  .toc{page:toc;padding:0;break-after:page}
  .toc h2{font-size:17pt;margin:1mm 0 3mm}
  .toc li a{padding:1.6mm 0}
  .toc .t{font-size:9.5pt;line-height:1.35}
  .toc .t small{font-size:7pt}
  .essentials{margin-top:5mm;padding:3.5mm 4mm}
  .essentials li{font-size:8.5pt;padding:1mm 0 1mm 4mm}
  .essentials li::before{top:2.6mm}
  .chapter{padding:0 0 5mm}
  .chapter + .chapter{border-top:0;padding-top:7mm}
  .chapter-head{margin-bottom:4mm;break-inside:avoid;break-after:avoid}
  .ch-num{font-size:26pt}
  .chapter-head .eyebrow{margin-top:2mm}
  .chapter-head h2{font-size:15.5pt}
  .lead{font-size:9.5pt}
  h3{font-size:11pt;margin-top:5mm;break-after:avoid}
  .diagram,figure,.callout,.rule,.qa li,table.kv tr,.essentials{break-inside:avoid}
  .diagram{margin:3mm 0 5mm}
  .diagram svg{max-height:88mm;width:auto;max-width:100%}
  .diagram.sm svg{max-height:64mm}
  figure.shot img{max-height:92mm;width:auto;max-width:100%;margin:0 auto}
  .phones{gap:3mm 2.5mm}
  .phones figure{width:31%}
  .phones img{border-radius:8px;max-height:58mm;width:auto;margin:0 auto}
  .phones figcaption{font-size:6.5pt}
  .phones figcaption b{font-size:6pt}
  figcaption,.diagram .cap{font-size:7.5pt}
  .callout,.rule p,.qa .a,table.kv{font-size:9pt}
  .back{page:full;width:120mm;height:213mm;min-height:0;margin:0;padding:12mm 10mm 10mm;break-before:page}
  .back-logo{width:34mm}
  .back-slogan{font-size:20pt}
  .back-mission{font-size:9pt}
  .back-meta{font-size:7pt}
  a{color:inherit;text-decoration:none}
}