/* ============================================================
   阴阳账 · yy.stalkerai.cn
   深墨 / 宣纸白 / 朱砂
   ============================================================ */

:root{
  --bg:#0a0a0b;
  --bg-alt:#0d0d0f;
  --ink:#e9e4da;
  --ink-soft:#c3bcb1;
  --muted:#8d867d;
  --dim:#615b54;
  --line:rgba(233,228,218,.11);
  --line-soft:rgba(233,228,218,.06);
  --accent:#c8442f;
  --accent-soft:rgba(200,68,47,.35);
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","Source Han Serif CN","STSong","SimSun",serif;
  --sans:"PingFang SC","HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --ease:cubic-bezier(.22,.68,.24,1);
}

*{margin:0;padding:0;box-sizing:border-box}

html{
  scroll-behavior:smooth;
  scroll-padding-top:88px;
  -webkit-text-size-adjust:100%;
}

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

/* 极淡的纸纹 */
body::after{
  content:"";
  position:fixed;inset:0;z-index:9998;pointer-events:none;
  opacity:.03;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection{background:var(--accent);color:#fff}

a{color:inherit;text-decoration:none}
em{font-style:normal}
b,strong{font-weight:600;color:var(--ink)}

.wrap{max-width:1160px;margin:0 auto;padding:0 28px}

/* ───────── 滚动进度 ───────── */
.progress{
  position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--accent),#e0764f);
  z-index:200;transition:width .1s linear;
}

/* ───────── 导航 ───────── */
.nav{
  position:fixed;top:0;left:0;right:0;height:68px;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 32px;
  background:rgba(10,10,11,.55);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background .4s var(--ease),border-color .4s var(--ease);
}
.nav.is-scrolled{background:rgba(10,10,11,.9);border-bottom-color:var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:15px;letter-spacing:.14em}
.brand-mark{width:20px;height:20px;color:var(--ink);flex:none}
.nav-links{display:flex;gap:30px}
.nav-links a{
  font-size:12.5px;letter-spacing:.16em;color:var(--muted);
  transition:color .3s var(--ease);
}
.nav-links a:hover{color:var(--ink)}

/* ───────── 首屏 ───────── */
.hero{
  position:relative;min-height:100svh;
  display:flex;align-items:center;justify-content:center;
  padding:130px 28px 110px;overflow:hidden;text-align:center;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 60% 50% at 50% 42%,rgba(200,68,47,.09),transparent 70%);
}
.hero-ornament{
  position:absolute;inset:0;display:grid;place-items:center;pointer-events:none;
}
.taiji{
  width:min(88vw,820px);height:auto;color:var(--ink);opacity:.05;
  animation:spin 200s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

.hero-inner{position:relative;z-index:2;max-width:920px}

.eyebrow{
  font-size:11.5px;letter-spacing:.42em;color:var(--muted);
  margin-bottom:38px;padding-left:.42em;
}
.eyebrow::before,.eyebrow::after{
  content:"";display:inline-block;width:26px;height:1px;
  background:var(--dim);vertical-align:middle;margin:0 16px;
}

h1{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(58px,13.5vw,150px);
  line-height:1.02;letter-spacing:.03em;
  display:flex;flex-direction:column;
}
h1 .accent{color:var(--accent)}

.lede{
  margin-top:40px;
  font-size:clamp(14.5px,1.75vw,18.5px);
  line-height:2.15;color:var(--ink-soft);letter-spacing:.04em;
}
.lede em{
  color:var(--ink);
  border-bottom:1px solid var(--accent-soft);
  padding-bottom:2px;
}
.hero-note{
  margin-top:26px;font-size:13.5px;line-height:2.15;
  color:var(--muted);letter-spacing:.05em;
}
.hero-actions{
  margin-top:52px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;
}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 30px;font-size:13.5px;letter-spacing:.12em;
  border:1px solid transparent;border-radius:1px;
  transition:all .35s var(--ease);cursor:pointer;
}
.btn-primary{background:var(--ink);color:#0a0a0b}
.btn-primary:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-ghost{border-color:var(--line);color:var(--muted)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn .arr{font-size:12px;transform:translateY(1px)}

.hero-scroll{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  width:1px;height:56px;background:linear-gradient(to bottom,transparent,var(--dim));
}
.hero-scroll span{
  position:absolute;left:-2px;top:0;width:5px;height:5px;border-radius:50%;
  background:var(--accent);animation:drop 2.6s var(--ease) infinite;
}
@keyframes drop{
  0%{transform:translateY(0);opacity:0}
  20%{opacity:1}
  80%{opacity:1}
  100%{transform:translateY(52px);opacity:0}
}

/* ───────── 通用版块 ───────── */
.section{padding:150px 0;position:relative}
.section-alt{
  background:var(--bg-alt);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}

.sec-head{margin-bottom:68px}
.sec-index{
  display:flex;align-items:center;gap:18px;
  font-family:var(--serif);
  font-size:12.5px;letter-spacing:.5em;color:var(--accent);
  margin-bottom:22px;padding-left:.5em;
}
.sec-index::after{
  content:"";width:44px;height:1px;background:var(--accent-soft);
}
h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(30px,4.3vw,54px);
  line-height:1.32;letter-spacing:.03em;
}
.sec-desc{
  margin-top:22px;color:var(--muted);
  font-size:14.5px;line-height:2;max-width:560px;letter-spacing:.03em;
}

/* ───────── 壹 · 主张 ───────── */
.big-quote{
  font-family:var(--serif);
  font-size:clamp(19px,2.5vw,29px);
  line-height:1.95;color:var(--ink-soft);
  max-width:820px;margin-bottom:70px;letter-spacing:.04em;
}
.big-quote .mark{
  color:var(--accent);
  border-bottom:1px solid var(--accent-soft);
}

.cards.three{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
}
.card{
  background:var(--bg);padding:38px 32px;
  transition:background .5s var(--ease),transform .5s var(--ease);
}
.card:hover{background:#101012}
.card-tag{
  font-size:10.5px;letter-spacing:.34em;color:var(--muted);
  margin-bottom:22px;
}
.card-tag.accent-tag{color:var(--accent)}
.card h3{
  font-family:var(--serif);font-weight:600;
  font-size:19px;letter-spacing:.06em;margin-bottom:16px;
}
.card p{font-size:14px;line-height:2;color:#9d968d}

.punchline{
  margin-top:100px;text-align:center;
  font-family:var(--serif);
  font-size:clamp(25px,4vw,46px);
  line-height:1.62;letter-spacing:.04em;
}
.punchline .dim{color:var(--dim)}
.punchline .accent{color:var(--accent)}
.punch-sub{
  margin-top:30px;font-family:var(--sans);
  font-size:13.5px;line-height:2.05;color:var(--muted);
  letter-spacing:.05em;max-width:620px;margin-left:auto;margin-right:auto;
}

/* ───────── 贰 · 算法 ───────── */
.steps{margin-top:10px}
.step{
  display:grid;grid-template-columns:56px 1fr;gap:28px;
  padding:34px 0;border-top:1px solid var(--line);
}
.step:last-child{border-bottom:1px solid var(--line)}
.step-num{
  width:44px;height:44px;border-radius:50%;
  border:1px solid var(--accent-soft);
  display:grid;place-items:center;
  font-family:var(--serif);font-size:14px;color:var(--accent);
  margin-top:2px;
}
.step-body h3{
  font-family:var(--serif);font-weight:600;
  font-size:18.5px;letter-spacing:.06em;margin-bottom:12px;
}
.step-body p{
  font-size:14.5px;line-height:2;color:#9d968d;max-width:740px;
}
.hl{color:var(--ink);border-bottom:1px solid var(--accent-soft);padding-bottom:1px}

/* 阴关自测 */
.calc{
  margin-top:88px;padding:52px;
  border:1px solid var(--line);
  background:
    radial-gradient(ellipse 70% 100% at 100% 0%,rgba(200,68,47,.06),transparent 60%),
    #0e0e10;
}
.calc-kicker{
  font-size:10.5px;letter-spacing:.4em;color:var(--accent);
  display:block;margin-bottom:16px;
}
.calc-head h3{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(22px,2.6vw,30px);letter-spacing:.05em;
}
.calc-head p{margin-top:14px;font-size:13.5px;color:var(--muted);line-height:1.95}
.calc-body{
  margin-top:44px;display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;
}

.slider{display:block;margin-bottom:30px}
.slider:last-child{margin-bottom:0}
.slider-label{
  display:block;font-size:12.5px;letter-spacing:.16em;color:var(--ink-soft);
  margin-bottom:18px;
}
.slider-label b{
  font-family:var(--serif);font-size:17px;color:var(--accent);
  margin-left:8px;font-weight:600;letter-spacing:0;
}
.slider-label i{
  display:block;font-style:normal;font-size:11.5px;color:var(--dim);
  letter-spacing:.06em;margin-top:6px;
}

input[type=range]{
  -webkit-appearance:none;appearance:none;
  width:100%;height:2px;background:var(--line);
  outline:none;cursor:pointer;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:14px;height:14px;border-radius:50%;
  background:var(--accent);border:3px solid var(--bg);
  box-shadow:0 0 0 1px var(--accent);
  transition:transform .25s var(--ease);
}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.18)}
input[type=range]::-moz-range-thumb{
  width:11px;height:11px;border-radius:50%;
  background:var(--accent);border:3px solid var(--bg);
  box-shadow:0 0 0 1px var(--accent);
}
input[type=range]::-moz-range-track{height:2px;background:var(--line)}

.calc-result{
  border-left:1px solid var(--line);padding-left:48px;
}
.verdict{
  font-family:var(--serif);font-size:30px;letter-spacing:.06em;
  color:var(--ink);transition:color .35s var(--ease);
}
.verdict.fail{color:var(--accent)}
.ratio{
  margin-top:14px;display:flex;align-items:baseline;gap:10px;
}
.ratio-label{font-size:11px;letter-spacing:.24em;color:var(--dim)}
.ratio-num{
  font-family:var(--serif);font-size:16px;color:var(--ink-soft);
  font-variant-numeric:tabular-nums;
}
.gauge{margin-top:30px}
.gauge-track{
  position:relative;height:6px;background:rgba(233,228,218,.07);overflow:visible;
}
.gauge-fill{
  position:absolute;inset:0 auto 0 0;width:40%;
  background:linear-gradient(90deg,#8e2f22,var(--accent));
  transition:width .3s var(--ease),background .3s var(--ease);
}
.gauge-mark{
  position:absolute;top:-9px;bottom:-9px;width:1px;left:50%;
  background:var(--ink);opacity:.6;
  transition:left .3s var(--ease);
}
.gauge-mark::before{
  content:"";position:absolute;top:-1px;left:-2px;
  width:5px;height:5px;border-radius:50%;background:var(--ink);
}
.gauge-legend{
  margin-top:16px;display:flex;justify-content:space-between;
  font-size:10.5px;letter-spacing:.18em;color:var(--dim);
}
.verdict-note{
  margin-top:24px;font-size:13px;line-height:1.95;color:var(--muted);
}

/* ───────── 叁 · 定律 ───────── */
.laws{margin-top:6px}
.law{border-top:1px solid var(--line)}
.law:last-child{border-bottom:1px solid var(--line)}
.law summary{
  display:flex;align-items:center;gap:22px;
  padding:27px 0;cursor:pointer;list-style:none;
  transition:padding-left .4s var(--ease);
}
.law summary::-webkit-details-marker{display:none}
.law summary:hover{padding-left:8px}
.law-num{
  font-family:var(--serif);font-size:11.5px;letter-spacing:.12em;
  color:var(--accent);width:34px;flex:none;
}
.law-name{
  font-family:var(--serif);font-size:19px;letter-spacing:.08em;
  flex:none;
}
.law-line{
  font-size:13px;color:var(--dim);letter-spacing:.05em;
  margin-left:auto;text-align:right;
}
.law summary::after{
  content:"+";font-family:var(--sans);font-size:15px;color:var(--dim);
  width:16px;text-align:center;flex:none;transition:color .3s var(--ease);
}
.law[open] summary::after{content:"−";color:var(--accent)}
.law summary:hover::after{color:var(--ink)}

.law-body{
  padding:0 0 34px 56px;max-width:830px;
  animation:fadeIn .5s var(--ease);
}
@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.law-body p{font-size:14.5px;line-height:2;color:#9d968d;margin-bottom:16px}
.law-body p:last-child{margin-bottom:0}
.law-case{
  border-left:2px solid var(--accent-soft);
  padding-left:18px;color:#8b847b !important;font-size:13.5px !important;
}

/* ───────── 肆 · 公理 ───────── */
.axioms{
  list-style:none;counter-reset:ax;margin-top:6px;
}
.axioms li{
  counter-increment:ax;
  display:grid;grid-template-columns:150px 1fr;gap:24px;
  padding:26px 0;border-top:1px solid var(--line);
  align-items:baseline;
}
.axioms li:last-child{border-bottom:1px solid var(--line)}
.axioms li b{
  font-family:var(--serif);font-size:20px;letter-spacing:.14em;
  color:var(--ink);
}
.axioms li span{font-size:14.5px;line-height:2;color:#9d968d}
.axioms li span em{color:var(--accent)}
.axiom-key b{color:var(--accent)}

.axiom-quote{
  margin-top:96px;text-align:center;
  font-family:var(--serif);font-size:clamp(28px,4.6vw,54px);
  line-height:1.55;letter-spacing:.06em;color:var(--accent);
}

/* ───────── 伍 · 边界 ───────── */
.boundary{
  display:grid;grid-template-columns:1fr 1fr;gap:72px;
  align-items:start;
}
.b-item{
  border-left:1px solid var(--accent-soft);
  padding-left:22px;margin-bottom:36px;
}
.b-item b{
  font-family:var(--serif);font-size:23px;letter-spacing:.2em;
  display:block;margin-bottom:12px;
}
.b-item p{font-size:14px;line-height:2;color:#9d968d}
.boundary-note p{font-size:14.5px;line-height:2.1;color:#9d968d;margin-bottom:20px}
.boundary-note em{
  font-family:var(--serif);font-size:21px;color:var(--ink);
}
.boundary-final{
  margin-top:36px;padding-top:28px;border-top:1px solid var(--line);
  font-family:var(--serif);font-size:17px;line-height:2.1;
  color:var(--ink-soft);letter-spacing:.04em;
}

/* ───────── 陆 · 金句 ───────── */
.section-quotes{border-top:1px solid var(--line-soft)}
.quotes{counter-reset:q}
.quotes p{
  counter-increment:q;position:relative;
  font-family:var(--serif);
  font-size:clamp(21px,3vw,36px);
  line-height:1.62;letter-spacing:.04em;
  color:var(--ink-soft);
  padding-left:56px;margin-bottom:58px;max-width:880px;
}
.quotes p:last-child{margin-bottom:0}
.quotes p::before{
  content:counter(q,decimal-leading-zero);
  position:absolute;left:0;top:.55em;
  font-family:var(--sans);font-size:11px;letter-spacing:.14em;
  color:var(--dim);font-variant-numeric:tabular-nums;
}
.quotes .accent{color:var(--accent)}

/* ───────── 柒 · 剧集 ───────── */
.eps{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);
}
.ep{
  background:var(--bg);padding:28px;
  display:flex;flex-direction:column;min-height:186px;
  transition:background .45s var(--ease);
}
.ep:hover{background:#111113}
.ep-meta{display:flex;justify-content:space-between;align-items:center}
.ep-num{
  font-family:var(--serif);font-size:12.5px;letter-spacing:.1em;
  color:var(--dim);font-variant-numeric:tabular-nums;
}
.ep-state{
  font-size:9.5px;letter-spacing:.2em;color:#5b564f;
  border:1px solid var(--line);padding:3px 8px;
}
.ep-state.live{color:var(--accent);border-color:var(--accent-soft)}
.ep h3{
  font-family:var(--serif);font-weight:600;font-size:20px;
  letter-spacing:.08em;margin-top:auto;padding-top:30px;
}
.ep-line{
  margin-top:10px;font-size:12.5px;line-height:1.75;
  color:var(--muted);letter-spacing:.03em;
}
.ep-foot{
  margin-top:44px;text-align:center;
  font-size:12px;letter-spacing:.2em;color:var(--dim);
}

/* ───────── 结 ───────── */
.closing{
  padding:170px 0 180px;text-align:center;
  border-top:1px solid var(--line-soft);
  background:radial-gradient(ellipse 70% 90% at 50% 100%,rgba(200,68,47,.07),transparent 70%);
}
.closing-line{
  font-family:var(--serif);font-size:clamp(26px,4.4vw,50px);
  line-height:1.62;letter-spacing:.05em;
}
.closing-sub{
  margin-top:36px;font-size:14px;line-height:2.2;color:var(--muted);
  letter-spacing:.05em;
}
.closing-slogan{
  margin-top:72px;font-family:var(--serif);
  font-size:12.5px;letter-spacing:.32em;color:var(--accent);
  padding-left:.32em;
}

/* ───────── 页脚 ───────── */
.footer{
  padding:60px 0 84px;border-top:1px solid var(--line);
  background:var(--bg-alt);
}
.footer-inner{display:flex;flex-direction:column;gap:22px}
.footer-brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--serif);font-size:14px;letter-spacing:.16em;
}
.footer-mark{width:18px;height:18px;color:var(--ink)}
.footer-note{
  font-size:12px;line-height:2.1;color:var(--dim);letter-spacing:.04em;
}
.footer-copy{
  font-family:var(--serif);font-size:11.5px;
  letter-spacing:.28em;color:var(--dim);padding-left:.28em;
}

/* ───────── 进场动效 ───────── */
/* 只有 JS 就绪时才隐藏；否则内容必须直接可见 */
.js [data-reveal]{
  opacity:0;transform:translateY(22px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);
  transition-delay:var(--d,0s);
}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ───────── 响应式 ───────── */
@media (max-width:980px){
  .section{padding:110px 0}
  .cards.three{grid-template-columns:1fr}
  .calc{padding:40px}
  .calc-body{grid-template-columns:1fr;gap:44px}
  .calc-result{border-left:none;border-top:1px solid var(--line);padding-left:0;padding-top:38px}
  .boundary{grid-template-columns:1fr;gap:48px}
  .eps{grid-template-columns:repeat(2,1fr)}
  .law-line{display:none}
}

@media (max-width:720px){
  .nav{padding:0 20px}
  .nav-links{display:none}
  .wrap{padding:0 20px}
  .section{padding:88px 0}
  .hero{padding:110px 20px 90px;min-height:92svh}
  .eyebrow{letter-spacing:.3em;font-size:10.5px}
  .eyebrow::before,.eyebrow::after{width:16px;margin:0 10px}
  .step{grid-template-columns:44px 1fr;gap:18px}
  .step-num{width:36px;height:36px;font-size:12.5px}
  .law-body{padding-left:0}
  .law-name{font-size:17px}
  .law summary::after{margin-left:auto}
  .law summary{gap:14px}
  .law-num{width:28px}
  .axioms li{grid-template-columns:1fr;gap:6px}
  .axioms li b{font-size:18px}
  .eps{grid-template-columns:1fr}
  .ep{min-height:150px}
  .quotes p{padding-left:0;margin-bottom:44px}
  .quotes p::before{position:static;display:block;margin-bottom:10px}
  .calc{padding:30px 22px;margin-top:64px}
  .verdict{font-size:25px}
  .closing{padding:110px 0 120px}
  .card{padding:30px 24px}
  .punchline{margin-top:70px}
}