/* ============================================================
   BOOM BAP CITY — 说唱文化小站
   纯静态样式表，无外部依赖
   ============================================================ */

:root{
  --ink:#0b0b0f;
  --ink-2:#101017;
  --ink-3:#16161f;
  --line:rgba(245,242,233,.12);
  --line-strong:rgba(245,242,233,.26);
  --paper:#f5f2e9;
  --muted:#9a9aa8;
  --acid:#d8ff00;
  --hot:#ff2e6e;
  --cyan:#22e3ff;
  --violet:#8b5cf6;
  --radius:16px;
  --display:"Impact","Haettenschweiler","Franklin Gothic Heavy","Arial Black","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --sans:"Inter","Helvetica Neue","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"SFMono-Regular","JetBrains Mono","Consolas","Roboto Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box;}

html{scroll-behavior:smooth;}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

body.no-scroll{overflow:hidden;}

img,svg{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input{font:inherit;color:inherit;}
button{cursor:pointer;border:0;background:none;}

h1,h2,h3,h4{font-family:var(--display);font-weight:900;letter-spacing:.01em;line-height:1.05;margin:0;}
p{margin:0;}

.skip{
  position:absolute;left:-9999px;top:0;z-index:999;
  background:var(--acid);color:#000;padding:10px 16px;font-weight:700;
}
.skip:focus{left:12px;top:12px;}

/* ---------- 质感层：颗粒 + 扫描线 ---------- */
.grain{
  position:fixed;inset:0;z-index:300;pointer-events:none;opacity:.32;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}
.scanlines{
  position:fixed;inset:0;z-index:299;pointer-events:none;opacity:.14;
  background:repeating-linear-gradient(to bottom,rgba(255,255,255,.06) 0 1px,transparent 1px 3px);
}

.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:400;background:transparent;}
.progress i{display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--acid),var(--cyan) 45%,var(--hot) 100%);
  box-shadow:0 0 14px rgba(216,255,0,.5);}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:250;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:14px clamp(16px,4vw,44px);
  background:rgba(11,11,15,.72);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav.is-scrolled{background:rgba(11,11,15,.94);}
.logo{display:flex;align-items:center;gap:12px;}
.logo-mark{
  font-family:var(--display);font-size:20px;letter-spacing:.02em;
  background:var(--acid);color:#000;padding:2px 9px 4px;border-radius:6px;
  transform:rotate(-3deg);
}
.logo-text{display:flex;flex-direction:column;line-height:1.15;
  font-family:var(--display);font-size:15px;letter-spacing:.06em;}
.logo-text em{font-family:var(--sans);font-style:normal;font-size:11px;
  letter-spacing:.16em;color:var(--muted);}
.nav-links{display:flex;gap:4px;align-items:center;}
.nav-links a{
  padding:8px 13px;border-radius:999px;font-size:13.5px;font-weight:600;
  color:#c9c9d4;transition:.2s;white-space:nowrap;
}
.nav-links a:hover{color:#000;background:var(--acid);}
.nav-toggle{
  display:none;padding:8px 14px;border:1px solid var(--line-strong);
  border-radius:999px;font-size:13px;font-weight:700;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 26px;border-radius:999px;font-weight:800;font-size:15px;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s;
  border:1px solid transparent;letter-spacing:.02em;
}
.btn-primary{background:var(--acid);color:#000;box-shadow:0 8px 0 rgba(216,255,0,.18);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 26px rgba(216,255,0,.28);}
.btn-ghost{border-color:var(--line-strong);color:var(--paper);}
.btn-ghost:hover{border-color:var(--paper);background:rgba(245,242,233,.08);transform:translateY(-3px);}

/* ---------- HERO ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:clamp(48px,7vw,96px) clamp(16px,4vw,44px) clamp(60px,7vw,110px);
  display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);
  gap:32px;align-items:center;
  border-bottom:1px solid var(--line);
}
.hero-inner{position:relative;z-index:2;max-width:760px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--line);border-radius:999px;
  padding:7px 15px;margin-bottom:26px;
}
.dot{width:7px;height:7px;border-radius:50%;background:var(--hot);
  box-shadow:0 0 0 4px rgba(255,46,110,.18);animation:pulse 1.6s infinite;}
@keyframes pulse{50%{box-shadow:0 0 0 9px rgba(255,46,110,0);}}

.hero-title{
  font-size:clamp(46px,9.2vw,124px);
  letter-spacing:-.015em;text-transform:none;
  display:flex;flex-direction:column;gap:2px;margin-bottom:26px;
}
.hero-title .line{display:block;}
.line-acid{
  color:var(--acid);
  text-shadow:4px 4px 0 rgba(255,46,110,.85),8px 8px 0 rgba(34,227,255,.4);
}
.line-outline{
  color:transparent;-webkit-text-stroke:2px var(--paper);
  letter-spacing:.02em;
}

.hero-sub{max-width:620px;color:#c6c6d2;font-size:clamp(15px,1.5vw,17.5px);margin-bottom:34px;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px;}

.hero-stats{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;
  margin:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;
  background:var(--line);
}
.hero-stats > div{background:var(--ink-2);padding:16px 14px;}
.hero-stats dt{font-family:var(--display);font-size:clamp(22px,3vw,32px);color:var(--acid);line-height:1;}
.hero-stats dd{margin:6px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45;}

.hero-mic{position:relative;z-index:2;justify-self:center;width:min(100%,300px);}
.hero-mic svg{filter:drop-shadow(0 26px 40px rgba(0,0,0,.6));}

.hero-blob{position:absolute;border-radius:50%;filter:blur(100px);opacity:.34;z-index:1;}
.blob-a{width:520px;height:520px;background:radial-gradient(circle,rgba(216,255,0,.5),transparent 66%);top:-230px;right:-140px;}
.blob-b{width:460px;height:460px;background:radial-gradient(circle,rgba(255,46,110,.45),transparent 66%);bottom:-200px;left:-130px;}

/* ---------- 跑马灯 ---------- */
.ticker{
  overflow:hidden;background:var(--acid);color:#000;
  border-top:2px solid #000;border-bottom:2px solid #000;
  padding:10px 0;
}
.ticker-track{
  display:flex;gap:26px;white-space:nowrap;width:max-content;
  font-family:var(--display);font-size:clamp(18px,2.4vw,30px);letter-spacing:.06em;
  animation:slide 26s linear infinite;
}
@keyframes slide{to{transform:translateX(-50%);}}

/* ---------- 通用区块 ---------- */
.section{padding:clamp(64px,8vw,120px) clamp(16px,4vw,44px);}
.section-alt{background:var(--ink-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.wrap{max-width:1180px;margin:0 auto;}

.sec-head{max-width:840px;margin-bottom:clamp(34px,4.5vw,60px);}
.kicker{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--hot);margin-bottom:14px;
}
.sec-head h2{font-size:clamp(28px,4.6vw,54px);margin-bottom:18px;}
.lede{color:#b9b9c6;font-size:clamp(15px,1.5vw,17px);max-width:760px;}

/* ---------- 四大元素 ---------- */
.elements{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:16px;margin-bottom:56px;
}
.el-card{
  position:relative;overflow:hidden;
  background:var(--ink-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 24px 22px;transition:transform .25s ease,border-color .25s ease;
}
.el-card::before{
  content:"";position:absolute;inset:0 auto auto 0;height:4px;width:100%;
  background:var(--accent);opacity:.9;
}
.el-card::after{
  content:"";position:absolute;width:180px;height:180px;right:-70px;bottom:-90px;
  border-radius:50%;background:var(--accent);opacity:.1;filter:blur(30px);
  transition:.3s;
}
.el-card:hover{transform:translateY(-6px);border-color:var(--line-strong);}
.el-card:hover::after{opacity:.22;}
.el-num{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--accent);
  display:block;margin-bottom:14px;
}
.el-card h3{font-size:22px;margin-bottom:12px;}
.el-card p{font-size:14.5px;color:#b3b3c0;}
.el-tag{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:var(--accent);margin-top:16px;text-transform:uppercase;
}

.quote{
  border-left:3px solid var(--acid);padding:8px 0 8px 26px;max-width:820px;margin:0;
}
.quote blockquote{margin:0;}
.quote p{font-size:clamp(18px,2.3vw,26px);font-weight:600;line-height:1.5;margin-bottom:10px;}
.quote figcaption{font-size:13px;color:var(--muted);}

/* ---------- 时间线 ---------- */
.timeline{list-style:none;margin:0;padding:0;position:relative;}
.timeline::before{
  content:"";position:absolute;left:104px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--acid),var(--cyan),var(--hot),transparent);
  opacity:.5;
}
.tl-item{
  display:grid;grid-template-columns:84px 1fr;gap:34px;
  padding:0 0 40px;position:relative;
}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:96px;top:9px;width:16px;height:16px;border-radius:50%;
  background:var(--ink);border:2px solid var(--acid);transform:translateX(-1px);z-index:2;
}
.section-alt .tl-item::before{background:var(--ink-2);}
.tl-hl::before{background:var(--acid);box-shadow:0 0 0 6px rgba(216,255,0,.16);}
.tl-year{
  font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.04em;
  color:var(--acid);padding-top:4px;text-align:right;
}
.tl-body h3{font-size:clamp(18px,2.2vw,24px);margin-bottom:10px;}
.tl-body p{color:#b3b3c0;font-size:15px;max-width:760px;}
.tl-hl .tl-body h3{color:var(--acid);}

/* 中文说唱那条放在"栏杆"里的时间线 */
.tl-rail{
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(255,255,255,.035),transparent 60%);
  padding:clamp(24px,3.4vw,42px) clamp(20px,3vw,36px) clamp(8px,1.4vw,16px);
}
.timeline-tight .tl-item{padding-bottom:32px;}
.timeline-tight .tl-body p{max-width:700px;}

/* ---------- 事实卡 ---------- */
.fact-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:16px;margin-top:20px;
}
.fact{
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  background:linear-gradient(180deg,rgba(255,255,255,.03),transparent);
}
.fact h4{font-size:17px;margin-bottom:10px;color:var(--cyan);}
.fact p{font-size:14.5px;color:#b3b3c0;}

/* ---------- 面板 ---------- */
.panel{
  background:var(--ink-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(22px,3vw,34px);margin-bottom:20px;
}
.section-alt .panel{background:var(--ink-3);}
.panel-head{margin-bottom:22px;}
.panel-head h3{font-size:clamp(20px,2.6vw,28px);margin-bottom:10px;}
.panel-head p{color:#b3b3c0;font-size:14.5px;max-width:720px;}
.p-body{color:#b3b3c0;font-size:15px;margin-bottom:16px;}

.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:20px;}
.grid-2 .panel{margin-bottom:0;}

.ticks{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px;}
.ticks li{
  position:relative;padding-left:22px;font-size:14.5px;color:#b3b3c0;
}
.ticks li::before{
  content:"";position:absolute;left:0;top:9px;width:8px;height:8px;
  background:var(--hot);border-radius:2px;transform:rotate(45deg);
}
.ticks strong{color:var(--paper);}

/* ---------- 十三辙 ---------- */
.rhyme-app{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:20px;}
.rhyme-tabs{display:flex;flex-wrap:wrap;gap:8px;align-content:flex-start;}
.rhyme-tab{
  border:1px solid var(--line);border-radius:999px;padding:8px 14px;
  font-size:13.5px;font-weight:600;color:#c9c9d4;transition:.18s;
}
.rhyme-tab:hover{border-color:var(--acid);color:var(--acid);}
.rhyme-tab.is-active{background:var(--acid);color:#000;border-color:var(--acid);font-weight:800;}

.rhyme-detail{
  border:1px solid var(--line);border-radius:12px;padding:22px;
  background:rgba(255,255,255,.02);min-height:190px;
}
.rhyme-empty{color:var(--muted);font-size:14px;}
.rhyme-detail h4{font-size:24px;margin-bottom:6px;color:var(--acid);}
.rhyme-detail .rd-sub{font-family:var(--mono);font-size:12.5px;color:var(--cyan);
  letter-spacing:.06em;margin-bottom:16px;}
.rd-label{font-size:12px;letter-spacing:.14em;color:var(--muted);
  text-transform:uppercase;font-family:var(--mono);margin-bottom:8px;}
.rd-words{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.rd-words span{
  background:rgba(216,255,0,.1);border:1px solid rgba(216,255,0,.28);
  color:var(--acid);border-radius:8px;padding:4px 11px;font-size:15px;font-weight:600;
}
.rd-note{font-size:14px;color:#b3b3c0;}

/* ---------- 押韵层次 ---------- */
.rhyme-levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;}
.rl{
  border:1px solid var(--line);border-radius:12px;padding:20px;
  background:rgba(255,255,255,.02);position:relative;
}
.rl-hl{border-color:rgba(255,46,110,.45);background:rgba(255,46,110,.06);}
.rl-badge{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;
  background:var(--hot);color:#000;padding:2px 8px;border-radius:5px;font-weight:700;
  display:inline-block;margin-bottom:12px;
}
.rl h4{font-size:19px;margin-bottom:9px;}
.rl p{font-size:14px;color:#b3b3c0;margin-bottom:14px;}
.rl code{
  display:block;font-family:var(--mono);font-size:12.5px;color:var(--cyan);
  background:rgba(34,227,255,.07);border-left:2px solid var(--cyan);
  padding:9px 12px;border-radius:0 8px 8px 0;line-height:1.6;
}

/* ---------- Beat Booth ---------- */
.booth{
  border:1px solid var(--line-strong);border-radius:20px;
  background:linear-gradient(180deg,var(--ink-3),var(--ink-2));
  padding:clamp(20px,3vw,32px);
  box-shadow:0 30px 70px rgba(0,0,0,.5),inset 0 1px 0 rgba(255,255,255,.05);
}
.booth-top{
  display:flex;align-items:center;justify-content:space-between;
  gap:20px;flex-wrap:wrap;padding-bottom:20px;margin-bottom:20px;
  border-bottom:1px solid var(--line);
}
.transport{
  display:inline-flex;align-items:center;gap:12px;
  background:var(--acid);color:#000;font-family:var(--display);
  font-size:20px;letter-spacing:.08em;padding:12px 30px;border-radius:12px;
  transition:.18s;
}
.transport:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(216,255,0,.25);}
.transport[aria-pressed="true"]{background:var(--hot);color:#000;}
.transport-icon{font-size:15px;}

.booth-meta{display:flex;align-items:center;gap:26px;flex-wrap:wrap;}
.bpm{display:flex;flex-direction:column;gap:6px;}
.bpm span{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;color:var(--muted);}
.bpm b{color:var(--acid);font-size:14px;}
.bpm input[type=range]{
  -webkit-appearance:none;appearance:none;width:200px;height:4px;border-radius:4px;
  background:linear-gradient(90deg,var(--acid),var(--hot));outline:none;
}
.bpm input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:var(--paper);border:3px solid var(--ink);cursor:pointer;
  box-shadow:0 0 0 2px var(--acid);
}
.bpm input[type=range]::-moz-range-thumb{
  width:18px;height:18px;border-radius:50%;background:var(--paper);
  border:3px solid var(--ink);cursor:pointer;box-shadow:0 0 0 2px var(--acid);
}
.status{
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:6px 14px;
}
.status.is-live{color:var(--acid);border-color:rgba(216,255,0,.4);}

.presets{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:22px;}
.presets-label{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;
  color:var(--muted);text-transform:uppercase;margin-right:4px;}
.presets button{
  border:1px solid var(--line-strong);border-radius:8px;padding:7px 14px;
  font-size:13px;font-weight:600;color:#c9c9d4;transition:.18s;
}
.presets button:hover{background:var(--paper);color:#000;border-color:var(--paper);}

.seq{display:flex;flex-direction:column;gap:10px;}
.seq-row{display:grid;grid-template-columns:110px minmax(0,1fr);gap:14px;align-items:center;}
.seq-name{display:flex;flex-direction:column;line-height:1.25;}
.seq-name b{font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;}
.seq-name span{font-size:11px;color:var(--muted);}
.seq-cells{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));gap:5px;}
.step{
  aspect-ratio:1/1;border-radius:6px;background:#20202b;
  border:1px solid rgba(255,255,255,.06);transition:background .12s,transform .12s,box-shadow .12s;
  position:relative;
}
.step:hover{background:#2c2c3a;}
.step.beat-start{background:#262634;}
.step.on{background:var(--acid);box-shadow:0 0 12px rgba(216,255,0,.4);}
.seq-row[data-sound="snare"] .step.on{background:var(--hot);box-shadow:0 0 12px rgba(255,46,110,.4);}
.seq-row[data-sound="hat"] .step.on{background:var(--cyan);box-shadow:0 0 12px rgba(34,227,255,.4);}
.seq-row[data-sound="clap"] .step.on{background:var(--violet);box-shadow:0 0 12px rgba(139,92,246,.45);}
.step.is-now::after{
  content:"";position:absolute;inset:-4px;border:2px solid var(--paper);
  border-radius:9px;pointer-events:none;
}

.booth-foot{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  flex-wrap:wrap;margin-top:24px;padding-top:20px;border-top:1px solid var(--line);
}
.ghost{
  border:1px solid var(--line-strong);border-radius:8px;padding:9px 18px;
  font-size:13px;font-weight:600;color:#c9c9d4;transition:.18s;
}
.ghost:hover{border-color:var(--hot);color:var(--hot);}
.hint{font-size:13px;color:var(--muted);max-width:520px;}

/* ---------- 代表人物 ---------- */
.tabs{display:flex;gap:8px;margin-bottom:26px;}
.tab{
  border:1px solid var(--line-strong);border-radius:999px;padding:10px 24px;
  font-size:14px;font-weight:700;color:#c9c9d4;transition:.18s;
}
.tab:hover{color:var(--paper);border-color:var(--paper);}
.tab.is-active{background:var(--acid);color:#000;border-color:var(--acid);}

.cards{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;
}
.cards.is-hidden{display:none;}
.card{
  border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  background:var(--ink-3);transition:transform .25s,border-color .25s;
}
.card:hover{transform:translateY(-6px);border-color:rgba(216,255,0,.5);}
.card-era{
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--hot);
  display:block;margin-bottom:12px;
}
.card h3{font-size:21px;margin-bottom:11px;}
.card p{font-size:14.5px;color:#b3b3c0;}
.card-tag{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--cyan);
  margin-top:16px !important;text-transform:uppercase;
}

/* ---------- 名词卡 ---------- */
.glossary{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
.gl{background:var(--ink);padding:22px;transition:background .2s;}
.gl:hover{background:var(--ink-3);}
.gl h4{font-size:17px;color:var(--acid);margin-bottom:8px;}
.gl p{font-size:14px;color:#b3b3c0;}

/* ---------- 页脚 ---------- */
.footer{
  border-top:1px solid var(--line);background:var(--ink-2);
  padding:clamp(40px,5vw,64px) clamp(16px,4vw,44px) 26px;
}
.footer-inner{
  display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap;
  margin-bottom:34px;
}
.footer-brand{display:flex;gap:14px;align-items:flex-start;}
.footer-brand p{font-family:var(--display);font-size:16px;letter-spacing:.05em;line-height:1.5;}
.footer-brand small{font-family:var(--sans);letter-spacing:0;font-size:12.5px;color:var(--muted);}
.footer-nav{display:flex;gap:18px;flex-wrap:wrap;align-items:center;}
.footer-nav a{font-size:13.5px;color:#c9c9d4;transition:.18s;}
.footer-nav a:hover{color:var(--acid);}
.footer-note{
  max-width:1180px;margin:0 auto;padding-top:22px;border-top:1px solid var(--line);
  font-size:12.5px;color:var(--muted);
}
.footer-updated{display:block;margin-top:6px;color:#7d7d8c;}

/* ---------- 404 页 ---------- */
.page-404{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:clamp(24px,6vw,80px) clamp(16px,4vw,44px);
  background:radial-gradient(120% 100% at 80% 0%,#1a1a24 0%,var(--ink) 55%);
}
.e404{position:relative;z-index:2;max-width:720px;text-align:left;}
.e404-code{
  font-family:var(--display);font-size:clamp(90px,20vw,190px);line-height:.9;
  color:transparent;-webkit-text-stroke:3px var(--acid);margin-bottom:8px;
}
.e404-title{font-size:clamp(28px,5vw,50px);margin-bottom:18px;}
.e404-text{color:#b9b9c6;font-size:clamp(15px,1.5vw,17px);margin-bottom:34px;max-width:560px;}
.e404-links{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- 滚动出现 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);}
.reveal.is-in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .hero{grid-template-columns:1fr;}
  .hero-mic{display:none;}
  .rhyme-app{grid-template-columns:1fr;}
}

@media (max-width:760px){
  .nav-links{
    position:fixed;inset:60px 12px auto 12px;
    flex-direction:column;align-items:stretch;gap:2px;
    background:rgba(16,16,23,.98);border:1px solid var(--line-strong);
    border-radius:14px;padding:10px;
    transform:translateY(-14px);opacity:0;pointer-events:none;transition:.22s;
  }
  .nav-links.is-open{transform:none;opacity:1;pointer-events:auto;}
  .nav-links a{padding:13px 16px;border-radius:10px;}
  .nav-toggle{display:block;}

  .hero-stats{grid-template-columns:repeat(2,minmax(0,1fr));}
  .timeline::before{left:7px;}
  .tl-item{grid-template-columns:1fr;gap:8px;padding-left:32px;}
  .tl-item::before{left:0;top:6px;}
  .tl-year{text-align:left;padding-top:0;}
  .seq-row{grid-template-columns:1fr;gap:8px;}
  .seq-cells{gap:4px;}
  .bpm input[type=range]{width:140px;}
  .section{padding-left:16px;padding-right:16px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  .reveal{opacity:1;transform:none;}
}