/* ============================================================
   小智录音卡 · 产品页 / 使用页 共用样式
   风格：少即是多。留白、克制的字重、单色阶 + 一点陶土红。
   ============================================================ */

:root{
  --ink:#1d1d1f;
  --ink-2:#424245;
  --muted:#6e6e73;
  --muted-2:#86868b;
  --line:rgba(0,0,0,.09);
  --line-soft:rgba(0,0,0,.06);
  --bg:#fff;
  --bg-soft:#f5f5f7;
  --bg-dark:#0b0b0c;
  --accent:#a4442c;
  --radius:22px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  letter-spacing:-.003em;
}
::selection{background:rgba(164,68,44,.14)}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.narrow{max-width:720px}

/* ---------- 顶部细条导航 ---------- */
.bar{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.78);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line-soft);
}
.bar__inner{
  max-width:1080px;margin:0 auto;padding:0 24px;height:48px;
  display:flex;align-items:center;gap:22px;font-size:12.5px;
}
.bar a{color:var(--ink);opacity:.72;text-decoration:none;letter-spacing:.01em}
.bar a:hover{opacity:1;text-decoration:none}
.bar a.on{opacity:1;font-weight:600}
.bar__sep{width:1px;height:14px;background:var(--line)}
.bar__spacer{flex:1}

/* ---------- 首屏 ---------- */
.hero{padding:clamp(84px,11vw,148px) 0 clamp(44px,6vw,72px);text-align:center}
.kicker{
  font-size:12px;letter-spacing:.3em;text-transform:uppercase;
  color:var(--muted-2);margin:0 0 22px;
}
h1{
  font-size:clamp(38px,7vw,84px);line-height:1.06;letter-spacing:-.026em;
  font-weight:600;margin:0 auto;max-width:14em;text-wrap:balance;
}
.hero__sub{
  font-size:clamp(18px,2.05vw,24px);line-height:1.55;color:var(--muted);
  max-width:620px;margin:26px auto 0;font-weight:400;letter-spacing:-.012em;
  text-wrap:balance;
}
.specs{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(16px,2.6vw,30px);margin:clamp(38px,5vw,58px) auto 0;
  max-width:820px;
}
@media (max-width:620px){.specs{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 12px}}
.hero__link{
  display:inline-block;margin-top:clamp(22px,3vw,30px);font-size:14.5px;
  color:var(--accent);letter-spacing:.01em;
}
.nw{white-space:nowrap}
.hero__sub2{
  font-size:clamp(15px,1.5vw,17px);color:var(--muted-2);margin:14px auto 0;
  letter-spacing:.01em;font-weight:400;text-wrap:balance;
}
.spec b{display:block;font-size:clamp(21px,2.5vw,29px);font-weight:600;letter-spacing:-.02em;line-height:1.2}
.spec span{display:block;margin-top:6px;font-size:12px;color:var(--muted-2);letter-spacing:.05em}

/* ---------- 产品渲染（纯 CSS，不靠照片） ---------- */
.stage{
  background:linear-gradient(180deg,#f5f5f7 0%,#f2f2f4 55%,#ededf0 100%);
  padding:clamp(64px,9vw,120px) 0 clamp(56px,7vw,92px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;
}
.cardrender{
  width:min(380px,76vw);aspect-ratio:1.585;border-radius:14px;position:relative;
  background:
    repeating-linear-gradient(96deg,rgba(255,255,255,.16) 0 2px,rgba(255,255,255,0) 2px 4px),
    linear-gradient(158deg,#fdfcf9 0%,#f2ede4 34%,#ddd6c6 72%,#c3baa6 100%);
  background-blend-mode:soft-light,normal;
  box-shadow:
    0 1px 1px rgba(42,30,18,.28),
    0 6px 10px -4px rgba(42,30,18,.22),
    0 34px 48px -26px rgba(42,30,18,.42),
    0 80px 110px -50px rgba(42,30,18,.5),
    inset 0 1px 0 rgba(255,255,255,.95),
    inset 0 -18px 26px -18px rgba(0,0,0,.30);
  display:flex;align-items:center;justify-content:center;
}
.cardrender::before{
  content:"";position:absolute;inset:0;border-radius:20px;pointer-events:none;
  background:linear-gradient(118deg,rgba(255,255,255,.55) 0%,rgba(255,255,255,0) 34%,rgba(255,255,255,0) 66%,rgba(255,255,255,.22) 100%);
}
.shot{
  margin:0;background:#0b0b0c;display:flex;flex-direction:column;align-items:center;
  padding:clamp(40px,6vw,84px) 24px clamp(30px,4vw,56px);
}
.shot img{
  display:block;height:min(68vh,700px);width:auto;max-width:92vw;
  border-radius:18px;
  box-shadow:0 34px 64px -36px rgba(0,0,0,.9),0 0 0 1px rgba(255,255,255,.08);
}
.shot--banner{padding-top:clamp(44px,6vw,80px)}
.shot__frame{position:relative;width:min(1180px,94vw);display:block}
.shot__frame img{width:100%;height:auto;display:block;border-radius:20px}
.shot__label{
  margin:0 0 clamp(22px,3vw,34px);font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;color:#8a8a8f;
}
.shot figcaption{
  margin-top:clamp(22px,3vw,34px);font-size:13.5px;line-height:1.9;color:#a1a1a6;
  text-align:center;max-width:620px;
}
.shot figcaption b{color:#d2d2d7;font-weight:500}

.stage__cap{margin:26px 0 0;font-size:12px;letter-spacing:.1em;color:var(--muted-2);text-transform:uppercase}
.stage__floor{
  width:min(300px,62vw);height:14px;margin-top:-4px;border-radius:50%;
  background:radial-gradient(50% 50% at 50% 50%,rgba(42,30,18,.22),rgba(42,30,18,0) 72%);
  filter:blur(3px);
}
.cardrender::after{
  content:"";position:absolute;inset:13px;border-radius:8px;pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.055);
}
.cardrender .edge{
  position:absolute;left:6px;right:6px;bottom:-3px;height:3px;border-radius:0 0 14px 14px;
  background:linear-gradient(180deg,rgba(120,108,88,.55),rgba(70,60,45,.75));
  filter:blur(.2px);z-index:-1;
}
.cardrender .mic{position:absolute;right:24px;top:22px;display:flex;gap:5px}
.cardrender .mic i{
  width:2.5px;height:2.5px;border-radius:50%;background:rgba(0,0,0,.22);
  box-shadow:inset 0 1px 1px rgba(0,0,0,.45);
}
.cardrender .engrave{
  font-size:10.5px;letter-spacing:.46em;text-transform:uppercase;
  color:rgba(0,0,0,.34);padding-left:.46em;
}
.cardrender .led{
  position:absolute;left:22px;top:22px;width:7px;height:7px;border-radius:50%;
  background:radial-gradient(circle at 34% 30%,#e4a08a 0%,#b1553a 42%,#7d3320 100%);
  box-shadow:
    0 0 0 1.5px rgba(0,0,0,.10),
    0 0 0 4px rgba(177,85,58,.10),
    0 0 12px rgba(177,85,58,.55);
}
.cardrender .pin{
  position:absolute;right:22px;bottom:20px;font-size:10px;color:rgba(0,0,0,.32);
  letter-spacing:.14em;font-family:var(--mono);
}

/* ---------- 章节 ---------- */
section{padding:clamp(64px,9vw,124px) 0}
.alt{background:var(--bg-soft)}
.dark{background:var(--bg-dark);color:#f5f5f7}
.dark h1,.dark h2,.dark h3,.dark .quote,.dark .voice{color:#f5f5f7}
.dark p,.dark .body{color:#a1a1a6}
.dark .kicker{color:#86868b}
.dark .eyebrow{color:#f5f5f7;font-weight:600}
.dark .tile{background:rgba(255,255,255,.07)}
.dark .tile p{color:#a1a1a6}
.dark .hair{border-color:rgba(255,255,255,.13)}

.eyebrow{
  font-size:14px;font-weight:600;letter-spacing:.1em;
  color:var(--ink);margin:0 0 20px;
}
h2{
  font-size:clamp(28px,4.3vw,50px);line-height:1.16;letter-spacing:-.022em;
  font-weight:600;margin:0 0 22px;max-width:20em;text-wrap:balance;
}
h3{font-size:17px;font-weight:600;margin:0 0 10px;letter-spacing:-.01em}
.body{
  font-size:clamp(17px,1.55vw,19px);line-height:1.78;color:var(--ink-2);
  max-width:680px;margin:0 0 1.1em;
  text-wrap:pretty;            /* 避免末行只剩一两个字 */
  line-break:strict;           /* 中文标点/词组断行更收敛 */
}
.body:last-child{margin-bottom:0}
.lead{font-size:clamp(19px,1.9vw,22px);line-height:1.6;color:var(--ink);letter-spacing:-.012em;max-width:760px}

.quote{
  font-size:clamp(23px,3.3vw,38px);line-height:1.44;letter-spacing:-.022em;
  font-weight:500;max-width:880px;margin:0;text-wrap:balance;
}
.quote em{font-style:normal;color:var(--accent)}
.quote cite{
  display:block;margin-top:20px;font-size:13px;font-style:normal;
  color:var(--muted-2);letter-spacing:.04em;font-weight:400;
}

/* 心声列表 */
.voices{margin:clamp(30px,4vw,46px) 0 0;border-top:1px solid var(--line)}
.voice{
  padding:clamp(22px,2.6vw,30px) 0;border-bottom:1px solid var(--line);
  font-size:clamp(19px,2.15vw,25px);line-height:1.5;letter-spacing:-.018em;
  display:flex;gap:clamp(14px,2.6vw,30px);align-items:baseline;
}
.voice i{
  font-style:normal;font-family:var(--mono);font-size:12px;color:var(--muted-2);
  flex:0 0 auto;padding-top:.4em;letter-spacing:.04em;
}
.dark .voice{border-color:rgba(255,255,255,.13)}
.dark .voices{border-color:rgba(255,255,255,.13)}

/* 网格小卡 */
.grid{display:grid;gap:16px;margin:clamp(28px,4vw,44px) 0 0}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:980px){.grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:620px){.grid--3{grid-template-columns:1fr}}
.tile{
  background:var(--bg-soft);border-radius:var(--radius);
  padding:clamp(24px,3vw,34px);
}
.tile h3{margin-bottom:8px}
.tile p{font-size:15.5px;line-height:1.72;color:var(--muted);margin:0}
.tile .num{font-family:var(--mono);font-size:12px;color:var(--muted-2);letter-spacing:.08em;display:block;margin-bottom:14px}

/* 对照（卖什么 / 我要什么） */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(16px,3vw,28px);margin:clamp(28px,4vw,44px) 0 0}
.split__col{
  border-radius:var(--radius);padding:clamp(24px,3vw,34px);
  background:#fff;box-shadow:inset 0 0 0 1px rgba(0,0,0,.045);
}
.split__col.now{background:#faf6f4;box-shadow:inset 0 0 0 1px rgba(164,68,44,.14)}
.split__col h3{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2);margin-bottom:20px}
.split__col.now h3{color:var(--accent)}
.split ul{margin:0;padding:0;list-style:none}
.split li{
  padding:13px 0;border-bottom:1px solid var(--line-soft);
  font-size:16px;line-height:1.6;color:var(--ink-2);
}
.split li:last-child{border-bottom:0}
.split li b{color:var(--ink);font-weight:600}

/* 付代价的清单（减法） */
.rows{margin:clamp(28px,4vw,44px) 0 0;border-top:1px solid var(--line)}
.row{
  display:grid;grid-template-columns:56px minmax(0,1fr) minmax(0,1.25fr);
  gap:clamp(12px,2.4vw,32px);padding:clamp(22px,2.6vw,30px) 0;
  border-bottom:1px solid var(--line);align-items:start;
}
.row__no{font-family:var(--mono);font-size:12px;color:var(--muted-2);letter-spacing:.06em;padding-top:.35em}
.row__what h3{font-size:clamp(18px,1.9vw,22px);margin:0 0 6px;letter-spacing:-.015em}
.row__what span{font-size:14.5px;color:var(--muted-2);line-height:1.6;display:block}
.row__cost{font-size:16px;line-height:1.7;color:var(--ink-2)}
.row__cost b{display:block;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);margin-bottom:6px;font-weight:500}
.row__cost em{font-style:normal;color:var(--accent)}

/* 链路 */
.chain{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  gap:10px;margin:clamp(30px,4vw,46px) 0 0;
}
.node{
  padding:11px 18px;border-radius:100px;background:var(--bg-soft);
  font-size:14px;color:var(--ink);letter-spacing:-.005em;white-space:nowrap;
}
.node--own{background:rgba(164,68,44,.10);color:#7d3320}
.arw{color:#c7c7cc;font-size:13px}

/* 数字 */
.numbers{display:flex;flex-wrap:wrap;gap:clamp(24px,4vw,52px);margin:clamp(26px,3.6vw,40px) 0 0}
.numbers div b{display:block;font-size:clamp(24px,3vw,34px);font-weight:600;letter-spacing:-.025em;font-variant-numeric:tabular-nums}
.numbers div span{display:block;margin-top:4px;font-size:13px;color:var(--muted-2)}

/* 价格 */
.price{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin:clamp(20px,3vw,32px) 0}
.price b{font-size:clamp(52px,8.4vw,96px);font-weight:600;letter-spacing:-.045em;line-height:1}
.price span{font-size:15px;color:var(--muted)}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 30px;border-radius:980px;background:var(--ink);color:#fff;
  font-size:16px;font-weight:500;letter-spacing:-.005em;text-decoration:none;
  transition:transform .2s ease,opacity .2s ease;
}
.btn:hover{text-decoration:none;opacity:.86;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px rgba(0,0,0,.18)}
.dark .btn{background:#f5f5f7;color:#0b0b0c}
.actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:clamp(28px,4vw,40px);align-items:center}
.actions .note{font-size:13.5px;color:var(--muted-2);margin:0}

/* 使用页：步骤 */
.step{
  padding:clamp(30px,4vw,48px) 0;border-top:1px solid var(--line);
}
.step__head{display:flex;gap:clamp(14px,2.4vw,24px);align-items:baseline;margin-bottom:14px}
.step__no{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.1em;flex:0 0 auto;padding-top:.5em}
.step h2{font-size:clamp(24px,3.2vw,34px);margin:0}
.step h3{font-size:16.5px;margin:26px 0 8px;color:var(--ink)}
.step p{max-width:700px}

ol.steps{margin:18px 0 0;padding:0;list-style:none;counter-reset:s}
ol.steps > li{
  counter-increment:s;position:relative;padding:12px 0 12px 38px;
  font-size:16px;line-height:1.72;color:var(--ink-2);border-bottom:1px solid var(--line-soft);
}
ol.steps > li:last-child{border-bottom:0}
ol.steps > li::before{
  content:counter(s);position:absolute;left:0;top:12px;
  width:22px;height:22px;border-radius:50%;background:var(--bg-soft);
  font-family:var(--mono);font-size:11px;color:var(--muted);
  display:flex;align-items:center;justify-content:center;
}
ol.steps b{color:var(--ink);font-weight:600}

pre{
  margin:16px 0;padding:18px 20px;border-radius:14px;background:#f5f5f7;
  font-family:var(--mono);font-size:13px;line-height:1.7;color:#3a3a3c;
  overflow-x:auto;-webkit-overflow-scrolling:touch;
}
code{font-family:var(--mono);font-size:.92em;background:rgba(0,0,0,.04);padding:.12em .4em;border-radius:5px;color:#3a3a3c}
pre code{background:none;padding:0;font-size:1em}
.dark pre{background:rgba(255,255,255,.07);color:#e8e8ed}
.dark code{background:rgba(255,255,255,.1);color:#e8e8ed}

/* 表格 */
.table{width:100%;border-collapse:collapse;margin:clamp(24px,3vw,34px) 0 0;font-size:15.5px}
.table th,.table td{text-align:left;padding:15px 14px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.65}
.table th{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);font-weight:500;white-space:nowrap}
.table td:first-child{color:var(--ink);white-space:nowrap}
.table td{color:var(--ink-2)}
.dark .table th,.dark .table td{border-color:rgba(255,255,255,.13)}

.note-box{
  margin:clamp(24px,3vw,34px) 0 0;padding:clamp(20px,2.6vw,26px);
  border-radius:16px;background:#faf6f4;border:1px solid rgba(164,68,44,.12);
  font-size:15.5px;line-height:1.72;color:#5c4a43;
}
.note-box b{color:#7d3320}
.dark .note-box{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.12);color:#c7c7cc}

/* 页脚 */
.foot{
  padding:clamp(48px,7vw,80px) 0;border-top:1px solid var(--line-soft);
  font-size:12.5px;line-height:1.9;color:var(--muted-2);
}
.foot a{color:var(--muted)}
.foot__nav{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:18px;font-size:13px}

/* 动效 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* 响应式 */
@media (max-width:760px){
  .split{grid-template-columns:1fr}
  .row{grid-template-columns:36px minmax(0,1fr)}
  .row__cost{grid-column:2;margin-top:10px}
  .bar__inner{gap:14px;font-size:11.5px;overflow-x:auto;scrollbar-width:none}
  .bar__inner::-webkit-scrollbar{display:none}
  .voice{gap:12px}
  body{font-size:16.5px}
}
@media print{
  .bar,.actions,.reveal{display:revert}
  .reveal{opacity:1;transform:none}
  .bar{display:none}
  body{background:#fff}
}

.ailine{
  font-size:12.5px;line-height:1.75;color:#8a8a8f;
  max-width:1000px;margin:0 auto;padding:18px clamp(20px,5vw,48px);
  border-top:1px solid var(--line,#e8e5df);border-bottom:1px solid var(--line,#e8e5df);
  text-align:left;word-break:break-word;
}
.ailine a{color:#a4442c;text-decoration:none}

/* ============================================================
   手机阅读优化（<=760px）
   目标：不是把桌面缩一缩，而是按手机重排——表格立起来、
   代码块可横滑、章节间距收紧、字号回到单手可读。
   ============================================================ */
@media (max-width:760px){
  /* 版心与首屏 */
  .wrap{padding:0 20px}
  .hero{padding:clamp(52px,13vw,84px) 0 clamp(30px,7vw,44px)}
  h1{font-size:clamp(29px,8.6vw,40px);line-height:1.14;letter-spacing:-.02em;max-width:none}
  .kicker{font-size:11px;letter-spacing:.2em;margin-bottom:14px}
  .hero__sub{font-size:16.5px;line-height:1.62;margin-top:16px;max-width:32em}
  .hero__sub2{font-size:14.5px;line-height:1.7;margin-top:12px}
  .hero__link{margin-top:18px;font-size:14px}
  .specs{gap:22px 12px;margin-top:28px}
  .spec b{font-size:20px;line-height:1.2}
  .spec span{font-size:11.5px;margin-top:4px}

  /* 章节 */
  section{padding:clamp(42px,11vw,64px) 0}
  h2{font-size:clamp(23px,6.4vw,30px);line-height:1.28;letter-spacing:-.01em;margin-bottom:.55em}
  .body{font-size:16px;line-height:1.75}
  .eyebrow{font-size:13px;letter-spacing:.08em;margin-bottom:14px}
  .step h3{font-size:15.5px;margin:22px 0 6px}

  /* 表格：立起来，不再横着挤 */
  .table{display:block;font-size:15px;margin-top:20px}
  .table thead{display:none}
  .table tbody,.table tr{display:block}
  .table tr{padding:15px 0;border-bottom:1px solid var(--line)}
  .table tr:first-child{padding-top:0}
  .table tr:last-child{border-bottom:0;padding-bottom:0}
  .table td{display:block;border:0;padding:0;white-space:normal}
  .table td:first-child{font-weight:600;color:var(--ink);white-space:normal;font-size:15.5px}
  .table td + td{margin-top:5px;font-size:14px;line-height:1.65;color:var(--muted)}
  .table td + td code{font-size:.94em}
  .dark .table tr{border-color:rgba(255,255,255,.13)}

  /* 代码块：字号降下来，横向可滑且不顶到屏幕边 */
  /* 手机上不横滑：长行自动折，内容全部看得见 */
  pre{font-size:11.5px;line-height:1.75;padding:14px;border-radius:12px;
      white-space:pre-wrap;word-break:break-word;overflow-x:visible}
  pre code{white-space:inherit;word-break:inherit}
  /* 真代码块（JSON）保持原样，可横滑，不把缩进折碎 */
  pre.pre--code{white-space:pre;overflow-x:auto;word-break:normal}
  pre.pre--code code{white-space:pre;word-break:normal}

  /* 步骤与清单 */
  ol.steps > li{padding:11px 0 11px 32px;font-size:15.5px;line-height:1.72}
  ol.steps > li::before{top:11px;width:20px;height:20px;font-size:10.5px}
  .note-box{padding:16px 16px;font-size:14.5px;line-height:1.7;border-radius:14px}
  .tile{padding:20px 18px;border-radius:18px}
  .tile p{font-size:14.5px;line-height:1.7}
  .row{padding:18px 0;gap:10px}
  .row__cost{margin-top:8px}
  .split__col{padding:18px 18px;border-radius:18px}
  .split li{font-size:15.5px;padding:11px 0}
  .voice{font-size:16px;line-height:1.7}
  .voice i{font-size:12px}

  /* 照片与图注 */
  .shot{padding:clamp(28px,7vw,44px) 0 0}
  .shot img{height:auto;max-height:60vh;object-fit:contain}
  .shot__label{font-size:10.5px;letter-spacing:.16em;margin-bottom:14px}
  .shot figcaption,.stage__cap{font-size:12.5px;line-height:1.7;margin-top:14px}
  
  /* 顶部与页脚 */
  .bar__inner{gap:12px;font-size:11.5px;padding:0 16px}
  .bar__inner a{white-space:nowrap}
  .foot{padding:clamp(36px,9vw,56px) 0 clamp(52px,14vw,72px);font-size:12px;line-height:1.85}
  .foot__nav{gap:14px;font-size:12.5px}
  .ailine{font-size:11.5px;line-height:1.8;padding:14px 20px}
  .actions{gap:12px}
  .btn{padding:13px 20px;font-size:15px}
}
/* 紧凑清单（三个账号那一类） */
.mini{margin:14px 0 0;padding:0;list-style:none;border-top:1px solid var(--line-soft)}
.mini li{padding:13px 0;border-bottom:1px solid var(--line-soft);font-size:16px;line-height:1.72;color:var(--ink-2)}
.mini li:last-child{border-bottom:0}
.mini b{color:var(--ink);font-weight:600}
.mini code{font-size:.92em}
@media (max-width:760px){
  .mini li{font-size:15.5px;padding:11px 0}
}

/* 章节内的小节（设计哲学：减法/造物/账/老规矩） */
.sub{
  margin:clamp(46px,6vw,74px) 0 clamp(20px,2.4vw,28px);padding-top:clamp(26px,3vw,34px);
  border-top:1px solid var(--line);
  font-size:clamp(19px,2.1vw,25px);line-height:1.32;letter-spacing:-.015em;
  color:var(--ink);
}
@media (max-width:760px){
  .sub{margin:38px 0 16px;padding-top:22px;font-size:18px}
}

/* 02 伪需求：货架照片 + 两张对照卡同一行（桌面三列） */
.split--photo{grid-template-columns:minmax(0,.82fr) minmax(0,1fr) minmax(0,1fr);align-items:stretch}
.split--photo > *{align-self:stretch}
.split__photo{height:100%}
.split__photo{
  margin:0;border-radius:var(--radius);overflow:hidden;background:#f5f5f7;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.045);
  display:flex;flex-direction:column;
}
.split__photo__img{flex:1 1 auto;min-height:0;position:relative;display:block;overflow:hidden}
.split__photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.split__photo figcaption{
  flex:none;font-size:12.5px;line-height:1.7;color:var(--muted-2);
  padding:14px 16px 18px;
}
.split__photo figcaption b{color:var(--muted);font-weight:600}

@media (max-width:980px){
  .split--photo{grid-template-columns:1fr 1fr}
  .split__photo{grid-column:1 / -1;display:grid;grid-template-columns:180px 1fr;align-items:center;gap:16px}
  .split__photo__img{min-height:180px}
  .split__photo figcaption{padding:0 18px 0 0}
}
@media (max-width:620px){
  .split--photo{grid-template-columns:1fr}
  .split__photo{grid-template-columns:1fr}
  .split__photo__img{min-height:0;aspect-ratio:387/589}
  .split__photo figcaption{padding:12px 14px 16px}
}

/* 引出一组卡片的那一行（如「我所厌恶的是：」） */
.lead-line{
  margin:clamp(30px,4vw,44px) 0 0;font-size:clamp(17px,1.9vw,20px);
  font-weight:600;color:var(--ink);letter-spacing:-.01em;
}
.dark .lead-line{color:#f5f5f7}
@media (max-width:760px){.lead-line{margin-top:26px;font-size:16.5px}}

/* 正文内宽图（浅色区块） */
.figure-wide{margin:clamp(34px,4.6vw,54px) 0 0}
.figure-wide img{
  display:block;width:100%;height:auto;border-radius:20px;
  box-shadow:0 24px 48px -30px rgba(0,0,0,.35),0 0 0 1px rgba(0,0,0,.05);
}
.figure-wide figcaption{
  margin-top:14px;font-size:13.5px;line-height:1.9;color:var(--muted-2);
}

/* 正文内链接 */
a.link{
  color:var(--accent);text-decoration:none;
  border-bottom:1px solid rgba(164,68,44,.28);
  transition:border-color .18s ease;
}
a.link:hover{border-bottom-color:var(--accent)}

/* 数据链路图（04 解法）：横排五步，手机上竖排 */
.flow-fig{margin:clamp(32px,4.4vw,48px) 0 0}
.flow{display:flex;align-items:stretch}
.flow__node{
  position:relative;flex:1 1 0;min-width:0;border-radius:16px;
  padding:16px 16px 16px 20px;overflow:hidden;
  background:color-mix(in srgb, var(--c) 6%, #fff);
  box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--c) 26%, transparent);
}
.flow__node::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--c);
}
.flow__node.is-end{background:color-mix(in srgb, var(--c) 9%, #fff)}
.flow__n{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:28px;height:23px;padding:0 7px;border-radius:999px;
  background:var(--c);color:#fff;font-size:11.5px;font-weight:700;letter-spacing:.06em;
}
.flow__t{margin:9px 0 5px;font-size:15px;font-weight:650;color:var(--ink);line-height:1.3}
.flow__d{font-size:12.5px;line-height:1.65;color:var(--muted)}
.flow__arrow{flex:0 0 66px;position:relative;display:flex;align-items:center;justify-content:center}
.flow__arrow::before{
  content:"";position:absolute;left:7px;right:14px;top:50%;height:2px;border-radius:2px;
  background:var(--c);opacity:.75;
}
.flow__arrow::after{
  content:"";position:absolute;right:6px;top:calc(50% - 5px);
  border-left:8px solid var(--c);border-top:5px solid transparent;border-bottom:5px solid transparent;
  opacity:.85;
}
.flow__arrow span{
  position:relative;top:-16px;font-size:10.5px;font-weight:650;line-height:1;color:var(--c);
  background:var(--bg,#fdfdfd);padding:0 5px;white-space:nowrap;
}
.flow-fig figcaption{margin-top:16px;font-size:13.5px;line-height:1.9;color:var(--muted-2)}
@media (max-width:760px){
  .flow{flex-direction:column}
  .flow__node{flex:none;padding:15px 16px 15px 20px;border-radius:15px}
  .flow__t{font-size:16px}
  .flow__d{font-size:13.5px;line-height:1.75;color:#5e5e63}
  .flow__n{font-size:12px;height:24px}
  .flow__arrow{flex:0 0 46px;width:100%}
  .flow__arrow::before{left:26px;right:auto;top:8px;bottom:8px;width:2px;height:auto}
  .flow__arrow::after{
    right:auto;left:21px;top:auto;bottom:6px;
    border-left:5px solid transparent;border-right:5px solid transparent;
    border-top:9px solid var(--c);border-bottom:0;
  }
  .flow__arrow span{position:absolute;left:44px;top:50%;transform:translateY(-50%);top:50%;font-size:11.5px}
}