/* RefHub 设计系统 v2 —— 参考“万象志 / Omni Journal”那类编辑部排版风格提炼的 tokens
   （来源：抓取站点内联 CSS 的 :root 变量 → 复刻其设计语言：Apple 系字栈、16/22/28 圆角、1240 容器、
     纸张感底色、克制的阴影与 cubic-bezier(.2,.8,.2,1) 缓动） */

:root{
  --color-background:#f5f5f7;
  --color-surface:#fff;
  --color-surface-elevated:#fbfbfd;
  --color-text-primary:#1d1d1f;
  --color-text-secondary:#424245;
  --color-text-muted:#6e6e73;
  --color-text-light:#86868b;
  --color-border:#d2d2d7;
  --color-border-soft:#00000012;
  --color-focus-ring:#0071e3b8;
  --color-inverse:#f5f5f7;
  --color-inverse-bg:#151516;
  --header-bg:#f5f5f7d1;
  --shadow-card:0 1px 0 #00000005;
  --shadow-card-hover:0 22px 64px #00000017;
  --container:1240px;
  --radius-sm:16px;
  --radius-md:22px;
  --radius-lg:28px;
  --radius-pill:999px;
  --ease-editorial:cubic-bezier(.2,.8,.2,1);
  --font-sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text",Helvetica Neue,Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-serif:"SF Pro Display",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Consolas,"PingFang SC",monospace;
}
:root[data-theme="dark"]{
  --color-background:#0c0c0d;
  --color-surface:#161617;
  --color-surface-elevated:#1c1c1e;
  --color-text-primary:#f5f5f7;
  --color-text-secondary:#d2d2d7;
  --color-text-muted:#a1a1a6;
  --color-text-light:#86868b;
  --color-border:#3a3a3c;
  --color-border-soft:#ffffff1a;
  --header-bg:#121213d6;
  --shadow-card:0 1px 0 #ffffff08;
  --shadow-card-hover:0 22px 64px #00000059;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--color-background)}
body{
  margin:0;background:var(--color-background);color:var(--color-text-primary);
  font:400 17px/1.62 var(--font-sans);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
a:hover{color:var(--color-text-muted)}
img{max-width:100%;display:block}
.container{width:min(var(--container),100% - 48px);margin:0 auto}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:20;
  background:var(--header-bg);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--color-border-soft);
}
.site-header__inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{font-weight:600;letter-spacing:-.01em;font-size:17px}
.brand small{color:var(--color-text-light);font-weight:400;margin-left:8px;font-size:12px;letter-spacing:.08em}
.nav{display:flex;gap:26px;font-size:14px;color:var(--color-text-secondary)}
.nav a:hover{color:var(--color-text-primary)}

/* ---------- hero ---------- */
.hero{padding:96px 0 56px;text-align:center}
.eyebrow{font:600 12px/1 var(--font-sans);letter-spacing:.16em;color:var(--color-text-light);text-transform:uppercase}
.hero h1{
  font-family:var(--font-serif);font-weight:700;letter-spacing:-.02em;
  font-size:clamp(34px,5.2vw,64px);line-height:1.08;margin:18px auto 16px;max-width:16ch;
}
.hero p.lede{font-size:clamp(17px,2vw,21px);color:var(--color-text-muted);max-width:58ch;margin:0 auto}

/* ---------- cards ---------- */
.grid{display:grid;gap:22px}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid--3,.grid--2{grid-template-columns:1fr}}
.card{
  background:var(--color-surface);border:1px solid var(--color-border-soft);
  border-radius:var(--radius-md);padding:26px 28px;
  box-shadow:var(--shadow-card);transition:box-shadow .45s var(--ease-editorial),transform .45s var(--ease-editorial);
}
.card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}
.card--flat:hover{transform:none;box-shadow:var(--shadow-card)}
.card h3{margin:0 0 8px;font-size:19px;letter-spacing:-.015em}
.card p{margin:0;color:var(--color-text-muted);font-size:15px}
.card__kicker{font:600 11px/1 var(--font-sans);letter-spacing:.14em;color:var(--color-text-light);text-transform:uppercase;margin-bottom:12px}

/* 主推卡片（首页焦点） */
.feature{
  display:grid;grid-template-columns:1.15fr .85fr;gap:0;overflow:hidden;
  background:var(--color-surface);border:1px solid var(--color-border-soft);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-card);margin:8px 0 40px;
}
@media(max-width:900px){.feature{grid-template-columns:1fr}}
.feature__main{padding:44px 46px}
.feature__side{
  background:var(--color-surface-elevated);border-left:1px solid var(--color-border-soft);
  padding:44px 40px;display:flex;flex-direction:column;gap:14px;justify-content:center;
}
@media(max-width:900px){.feature__side{border-left:0;border-top:1px solid var(--color-border-soft)}}
.feature h2{font-family:var(--font-serif);font-size:clamp(24px,3vw,34px);line-height:1.18;letter-spacing:-.02em;margin:10px 0 14px}

/* 邀请码 */
.codebox{
  display:inline-flex;align-items:center;gap:14px;margin:6px 0 4px;
  background:var(--color-inverse-bg);color:var(--color-inverse);
  border-radius:var(--radius-pill);padding:12px 22px;
}
.codebox code{font:600 22px/1 var(--font-mono);letter-spacing:.14em}
.codebox button{
  border:0;border-radius:var(--radius-pill);padding:8px 14px;font-size:12px;cursor:pointer;
  background:#ffffff1f;color:inherit;font-family:var(--font-sans);
}
.codebox button:hover{background:#ffffff33}

/* ---------- 内容排版 ---------- */
.prose{max-width:74ch}
.prose h2{font-family:var(--font-serif);font-size:clamp(22px,2.6vw,30px);line-height:1.2;letter-spacing:-.02em;margin:52px 0 14px}
.prose h3{font-size:18px;letter-spacing:-.01em;margin:32px 0 8px}
.prose p,.prose li{color:var(--color-text-secondary)}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:8px 0}
.prose strong{color:var(--color-text-primary)}

.note{
  border-left:2px solid var(--color-text-primary);padding:4px 0 4px 18px;margin:26px 0;
  color:var(--color-text-primary);
}
.note--warn{border-left-color:#d6803c}
.step{
  display:grid;grid-template-columns:44px 1fr;gap:18px;padding:22px 0;
  border-top:1px solid var(--color-border-soft);
}
.step:last-child{border-bottom:1px solid var(--color-border-soft)}
.step__num{
  font:600 14px/1 var(--font-mono);color:var(--color-text-light);
  width:34px;height:34px;border:1px solid var(--color-border);border-radius:var(--radius-pill);
  display:flex;align-items:center;justify-content:center;
}
.step h3{margin:6px 0 6px}

table{width:100%;border-collapse:collapse;margin:22px 0;font-size:15px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--color-border-soft)}
th{font-weight:600;color:var(--color-text-muted);font-size:13px;letter-spacing:.04em}

details{border-top:1px solid var(--color-border-soft);padding:16px 0}
details:last-of-type{border-bottom:1px solid var(--color-border-soft)}
summary{cursor:pointer;font-weight:600;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"＋";float:right;color:var(--color-text-light)}
details[open] summary::after{content:"－"}
details p{margin:12px 0 0;color:var(--color-text-muted);font-size:15px}

.btn{
  display:inline-block;background:var(--color-text-primary);color:var(--color-background);
  border-radius:var(--radius-pill);padding:12px 24px;font-size:15px;font-weight:500;
  transition:opacity .3s var(--ease-editorial);
}
.btn:hover{opacity:.82;color:var(--color-background)}
.btn--ghost{background:transparent;color:var(--color-text-primary);border:1px solid var(--color-border)}

.tag{display:inline-block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--color-text-light);border:1px solid var(--color-border);border-radius:var(--radius-pill);padding:4px 12px}

.site-footer{
  margin-top:120px;border-top:1px solid var(--color-border-soft);
  padding:36px 0;color:var(--color-text-light);font-size:13px;
}
.site-footer a:hover{color:var(--color-text-primary)}
.sticky-cta{position:fixed;left:50%;transform:translateX(-50%);bottom:22px;z-index:30;display:none}
@media(max-width:700px){.sticky-cta{display:block}}

/* ---------- v2.1 观感增强：渐变 hero / 层级流程图 / 事实卡 ---------- */
.hero{position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:-40% -20% auto -20%;height:520px;
  background:
    radial-gradient(600px 300px at 20% 30%,color-mix(in srgb,var(--color-text-primary) 7%,transparent),transparent 70%),
    radial-gradient(520px 280px at 80% 10%,color-mix(in srgb,var(--color-text-primary) 5%,transparent),transparent 70%);
  pointer-events:none;
}
.hero h1{position:relative}
.section-head{display:flex;align-items:baseline;gap:14px;margin:64px 0 8px}
.section-head .num{font:600 12px/1 var(--font-mono);color:var(--color-text-light);letter-spacing:.16em}
.section-head h2{margin:0}

/* 层级流程图 */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:26px 0 8px}
@media(max-width:900px){.flow{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.flow{grid-template-columns:1fr}}
.flow__node{
  position:relative;background:var(--color-surface);border:1px solid var(--color-border-soft);
  border-radius:var(--radius-sm);padding:18px 18px 16px;
  box-shadow:var(--shadow-card);transition:transform .4s var(--ease-editorial),box-shadow .4s var(--ease-editorial)
}
.flow__node:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover)}
.flow__node b{display:block;font-size:15px;letter-spacing:-.01em;margin-bottom:6px}
.flow__node span{font-size:13.5px;color:var(--color-text-muted);line-height:1.6}
.flow__node::after{
  content:"";position:absolute;top:50%;right:-9px;width:14px;height:1px;
  background:var(--color-border);
}
.flow__node:last-child::after{display:none}
@media(max-width:900px){.flow__node::after{display:none}}
.flow__idx{font:600 11px/1 var(--font-mono);color:var(--color-text-light);letter-spacing:.14em;display:block;margin-bottom:10px}

/* 关键事实卡 */
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0 0}
@media(max-width:900px){.facts{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.facts{grid-template-columns:1fr}}
.fact{background:var(--color-surface-elevated);border:1px solid var(--color-border-soft);border-radius:var(--radius-sm);padding:16px 18px}
.fact b{display:block;font-size:20px;letter-spacing:-.02em;margin-bottom:2px}
.fact span{font-size:13px;color:var(--color-text-muted)}

/* 更精致的表格容器 */
.table-wrap{border:1px solid var(--color-border-soft);border-radius:var(--radius-sm);overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;background:var(--color-surface);margin:22px 0}
.table-wrap table{margin:0}
.table-wrap tr:nth-child(even) td{background:color-mix(in srgb,var(--color-text-primary) 2.5%,transparent)}
.table-wrap th{background:var(--color-surface-elevated)}

/* ---------- v2.2 杂志式首页（参考编辑部排版：主推 + 侧栏列表 + 条目网格） ---------- */
.masthead{padding:56px 0 26px;border-bottom:1px solid var(--color-border-soft)}
.masthead h1{font-family:var(--font-serif);font-size:clamp(30px,4.4vw,52px);line-height:1.06;letter-spacing:-.025em;margin:12px 0 12px;max-width:20ch}
.masthead p{margin:0;color:var(--color-text-muted);max-width:52ch}

.lead{display:grid;grid-template-columns:1.25fr .75fr;gap:34px;padding:38px 0 8px}
@media(max-width:900px){.lead{grid-template-columns:1fr;gap:24px}}
.lead__main{display:block;background:var(--color-surface);border:1px solid var(--color-border-soft);border-radius:var(--radius-lg);padding:32px 34px;box-shadow:var(--shadow-card);transition:box-shadow .45s var(--ease-editorial),transform .45s var(--ease-editorial)}
.lead__main:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}
.lead__main h2{font-family:var(--font-serif);font-size:clamp(23px,3vw,33px);line-height:1.16;letter-spacing:-.02em;margin:12px 0 12px}
.lead__main p{margin:0 0 20px;color:var(--color-text-muted)}
.lead__side{display:flex;flex-direction:column;gap:14px}
.lead__side h3{margin:0 0 2px;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--color-text-light);font-weight:600}

.meta{display:flex;gap:12px;align-items:center;font-size:12.5px;color:var(--color-text-light);letter-spacing:.03em}
.meta span+span::before{content:"·";margin-right:12px}

.list{border-top:1px solid var(--color-border-soft)}
.row{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:baseline;padding:20px 4px;border-bottom:1px solid var(--color-border-soft);transition:padding-left .35s var(--ease-editorial),background .35s var(--ease-editorial)}
.row:hover{padding-left:10px;background:color-mix(in srgb,var(--color-text-primary) 2.5%,transparent)}
.row h3{margin:0 0 4px;font-size:18px;letter-spacing:-.01em;font-weight:600}
.row p{margin:0;font-size:14px;color:var(--color-text-muted)}
.row time{font-size:12.5px;color:var(--color-text-light);white-space:nowrap;font-family:var(--font-mono)}

.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:28px 0 0}
@media(max-width:900px){.tiles{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.tiles{grid-template-columns:1fr}}
.tile{background:var(--color-surface);border:1px solid var(--color-border-soft);border-radius:var(--radius-md);padding:22px 24px;box-shadow:var(--shadow-card);transition:transform .45s var(--ease-editorial),box-shadow .45s var(--ease-editorial)}
.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-card-hover)}
.tile h3{margin:10px 0 6px;font-size:17px}
.tile p{margin:0;font-size:14px;color:var(--color-text-muted)}

.band{margin:56px 0 0;padding:30px 34px;border-radius:var(--radius-lg);background:var(--color-inverse-bg);color:var(--color-inverse)}
.band h2{font-family:var(--font-serif);font-size:clamp(20px,2.6vw,28px);letter-spacing:-.02em;margin:0 0 8px}
.band p{margin:0;color:#ffffffab;font-size:15px}

/* ---------- v2.3 大标题开篇（照参考站规格：clamp(60,7vw,108) / 行高 .94 / 负字距 / 首字下沉） ---------- */
.hero-display{min-height:min(760px,88vh);display:flex;flex-direction:column;justify-content:flex-end;padding:120px 0 56px;position:relative}
.hero-display .eyebrow{margin-bottom:22px}
.display{
  font-family:var(--font-serif);font-weight:700;letter-spacing:-.045em;line-height:.94;
  font-size:clamp(40px,7vw,104px);margin:0;
}
.display .line{display:block}
.display em{font-style:normal;color:var(--color-text-light)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(200px,.7fr);align-items:end;gap:40px;margin-top:34px}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:22px}}
.hero-grid .kicker{font-size:13.5px;line-height:1.75;color:var(--color-text-muted);margin:0}
.hero-grid .stat{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--color-text-light)}

/* 正文首字下沉 + 更大的阅读字号（长文页） */
.prose--read{max-width:760px}
.prose--read p{font-size:clamp(18px,1.5vw,20px);line-height:1.78;letter-spacing:-.008em;margin:0 0 30px}
.prose--read>p:first-of-type::first-letter{
  float:left;font-family:var(--font-serif);font-size:74px;font-weight:650;line-height:.72;
  margin:6px 10px 0 0;color:var(--color-text-primary);
}

/* 大图占位（等真实截图时直接替换 src） */
.cover{aspect-ratio:16/10;border-radius:var(--radius-lg);overflow:hidden;background:
  linear-gradient(135deg,color-mix(in srgb,var(--color-text-primary) 8%,transparent),transparent 60%),
  var(--color-surface-elevated);border:1px solid var(--color-border-soft);margin:34px 0 0}
.cover--tall{aspect-ratio:4/3}

/* ---------- v2.4 版式修正：开篇去掉大片空白 + 主推卡放大 ---------- */
.hero-display{min-height:0;padding:54px 0 34px;justify-content:flex-start}
.display{font-size:clamp(38px,6.2vw,88px)}
.lead{padding:26px 0 8px;gap:30px}
.lead__main{padding:40px 42px}
.lead__main h2{font-size:clamp(26px,3.2vw,38px);line-height:1.14}
.lead__main p{font-size:16.5px}
.lead__side{gap:16px}
.row{padding:22px 4px}
.row h3{font-size:19px}
.tile{padding:26px 28px}
@media(max-width:700px){.display{font-size:clamp(32px,9vw,44px)}.lead__main{padding:28px 24px}}

/* ---------- v2.5 字号层级统一（避免忽大忽小） ---------- */
:root{
  --fs-display:clamp(34px,4.6vw,58px);
  --fs-h1:clamp(30px,3.8vw,46px);
  --fs-h2:clamp(21px,2.3vw,27px);
  --fs-h3:19px;
  --fs-lede:17.5px;
  --fs-body:16.5px;
  --fs-small:14px;
  --fs-micro:12.5px;
}
.display{font-size:var(--fs-display);line-height:1.0;letter-spacing:-.032em}
.hero h1{font-size:var(--fs-h1);line-height:1.12;letter-spacing:-.028em;margin:14px 0 12px}
.prose h2,.lead__main h2{font-size:var(--fs-h2);line-height:1.22;letter-spacing:-.02em}
.prose h3,.row h3,.card h3{font-size:var(--fs-h3);line-height:1.3}
.lede,.lead__main p{font-size:var(--fs-lede);line-height:1.66;color:var(--color-text-secondary)}
.prose p,.prose li,.fact span,.flow__node span{font-size:var(--fs-body)}
.fact b{font-size:clamp(22px,2.6vw,30px);line-height:1.1}
.codebox code{font-size:clamp(20px,2.4vw,26px)}
.eyebrow,.meta{font-size:var(--fs-micro)}
.table-wrap table,.prose table{font-size:15px}

/* ---------- v2.6 「三步填码」块 ---------- */
.steps3{list-style:none;margin:26px 0 0;padding:0;display:grid;gap:12px}
.steps3 li{display:grid;grid-template-columns:auto minmax(0,1fr);gap:16px;align-items:start;
  background:var(--color-surface);border:1px solid var(--color-border-soft);
  border-radius:var(--radius-md);padding:18px 20px}
.steps3>li>b{font-weight:700;font-size:15px;color:#fff;background:#111827;
  border-radius:10px;padding:7px 11px;white-space:nowrap}
.steps3>li>span{color:var(--color-text-secondary);font-size:var(--fs-body);line-height:1.62}
[data-theme="dark"] .steps3>li>b{background:#f4f4f5;color:#111827}
@media(max-width:600px){.steps3 li{grid-template-columns:1fr}}

/* ---------- v2.7 居中开篇 + 方法列表 ---------- */
.hero--center{text-align:center}
.hero--center .codebox,.hero--center .steps3{text-align:left}
.hero--center .codebox{margin-left:auto;margin-right:auto;max-width:520px}
.hero--center h1{margin-left:auto;margin-right:auto}
.hero--center .lede{margin-left:auto;margin-right:auto;max-width:46ch}
ul.methods{list-style:none;margin:22px 0 0;padding:0;display:grid;gap:12px}
ul.methods>li{background:var(--color-surface);border:1px solid var(--color-border-soft);
  border-radius:var(--radius-md);padding:18px 20px}
ul.methods>li>b{display:block;margin-bottom:6px;font-size:var(--fs-h3)}
ul.methods>li>span{color:var(--color-text-secondary);font-size:var(--fs-body);line-height:1.62}

/* ---------- v2.8 排版微调（情报落地） ---------- */
h1,h2,h3{text-wrap:balance}
p,li,td{text-wrap:pretty}
h2,h3{scroll-margin-top:92px}
::selection{background:color-mix(in srgb,var(--color-text-primary) 20%,transparent)}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}

/* ---------- v2.10 窄屏表格可横向滚动，避免挤成一列 ---------- */
@media (max-width:640px){
  .table-wrap table{min-width:520px}
  .table-wrap table th,.table-wrap table td{white-space:normal}
}
/* ---------- v2.9 阅读进度条 + 回到顶部 ---------- */
.readbar{position:fixed;top:0;left:0;right:0;height:3px;transform:scaleX(0);transform-origin:0 50%;
  background:var(--color-text-primary);opacity:.72;z-index:70;pointer-events:none;
  transition:transform .08s linear}
.totop{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:var(--radius-pill);
  border:1px solid var(--color-border-soft);background:var(--color-surface);color:var(--color-text-primary);
  font-size:18px;line-height:1;cursor:pointer;box-shadow:var(--shadow-card-hover);
  opacity:0;visibility:hidden;transition:opacity .22s var(--ease-editorial),visibility .22s;z-index:70}
.totop.show{opacity:.95;visibility:visible}
.totop:hover{background:var(--color-surface-elevated)}
@media (prefers-reduced-motion:reduce){.readbar{transition:none}}

/* ---------- v2.11 首页卡片：链接与复制按钮解耦（避免 a 内嵌 button） ---------- */
.lead__main>a{display:block;color:inherit;text-decoration:none}