*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

:root{
  --ink:#0B0F12;
  --surface:#1A2026;
  --surface-2:#141A1F;
  --outline:#2E373D;
  --text:#F2EDE4;
  --text-dim:rgba(242,237,228,.66);
  --text-faint:rgba(242,237,228,.44);
  --cyan:#3FE0D0;
  --cool:#5BC8DE;
  --neon:#4DA6FF;
  --amber:#F0A03C;
  --gold:#E8C168;
  --moss:#6E8B6A;
  --clay:#B9714F;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --r-lg:20px;
  --r-pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(0deg,rgba(255,255,255,.022) 0 1px,transparent 1px 3px),
    radial-gradient(1000px 640px at 6% -14%,rgba(63,224,208,.10),transparent 62%),
    radial-gradient(860px 560px at 104% 2%,rgba(240,160,60,.075),transparent 60%);
  background-repeat:repeat,no-repeat,no-repeat;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4{font-weight:900;line-height:1.14;letter-spacing:-.02em}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}

/* ---------- 共享容器 ---------- */
.wrap{width:min(1440px,100%);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;left:16px;top:-80px;z-index:200;
  padding:12px 22px;border-radius:var(--r-pill);
  background:var(--cyan);color:#05100F;font-weight:800;font-size:14px;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(11,15,18,.86);
  border-bottom:1px solid var(--outline);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:background-color .28s var(--ease),box-shadow .28s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(9,13,16,.97);
  box-shadow:0 22px 46px -34px rgba(0,0,0,1);
}
.header-inner{
  width:min(1440px,100%);
  margin-inline:auto;
  padding:12px clamp(16px,4vw,40px);
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(12px,2vw,32px);
}
.brand-mark{display:flex;flex-direction:column;gap:1px;flex:0 0 auto;padding:2px 4px;border-radius:12px}
.brand-name{font-size:clamp(18px,2vw,21px);font-weight:900;letter-spacing:-.02em;line-height:1.24;color:var(--text)}
.brand-accent{font-family:var(--font-mono);color:var(--cyan);margin-inline:1px;transition:color .24s var(--ease)}
.brand-mark:hover .brand-accent{color:var(--gold)}
.brand-sub{font-size:11.5px;letter-spacing:.14em;color:var(--text-faint)}

.primary-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,18px)}
.nav-list{display:flex;align-items:center;gap:6px}
.nav-block{
  --block-color:var(--cyan);
  --block-tint:rgba(63,224,208,.14);
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 13px;border-radius:var(--r-pill);
  border:1px solid transparent;
  color:var(--text-dim);font-size:14px;font-weight:700;
  white-space:nowrap;
  transition:background-color .26s var(--ease),color .26s var(--ease),border-color .26s var(--ease),box-shadow .26s var(--ease),transform .26s var(--ease);
}
.nav-block[data-accent="cyan"]{--block-color:#3FE0D0;--block-tint:rgba(63,224,208,.16)}
.nav-block[data-accent="moss"]{--block-color:#6E8B6A;--block-tint:rgba(110,139,106,.2)}
.nav-block[data-accent="neon"]{--block-color:#4DA6FF;--block-tint:rgba(77,166,255,.16)}
.nav-block[data-accent="cool"]{--block-color:#5BC8DE;--block-tint:rgba(91,200,222,.16)}
.nav-block[data-accent="gold"]{--block-color:#E8C168;--block-tint:rgba(232,193,104,.16)}
.nav-block[data-accent="clay"]{--block-color:#B9714F;--block-tint:rgba(185,113,79,.2)}
.nav-num{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--block-color);font-variant-numeric:tabular-nums}
.nav-label{letter-spacing:.02em}
.nav-block:hover{background:var(--block-tint);color:var(--text);border-color:transparent;transform:translateY(-1px)}
.nav-block[aria-current="page"]{
  background:var(--block-color);
  color:var(--ink);
  border-color:var(--block-color);
  box-shadow:0 12px 30px -18px var(--block-color);
}
.nav-block[aria-current="page"] .nav-num{color:var(--ink);opacity:.68}

.nav-utility{
  display:flex;align-items:center;gap:8px;
  padding-left:clamp(8px,1.4vw,18px);
  border-left:1px solid var(--outline);
}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 14px;border-radius:var(--r-pill);
  font-size:13.5px;font-weight:700;white-space:nowrap;
  border:1px solid var(--outline);color:var(--text-dim);
  transition:background-color .26s var(--ease),color .26s var(--ease),border-color .26s var(--ease);
}
.pill--amber{color:var(--amber);border-color:rgba(240,160,60,.5);background:rgba(240,160,60,.1)}
.pill--amber:hover{background:rgba(240,160,60,.22);color:var(--gold);border-color:rgba(240,160,60,.8)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 16px;border-radius:var(--r-pill);
  border:1px solid var(--outline);background:rgba(26,32,38,.9);
  color:var(--text);font-size:13.5px;font-weight:700;
}
.nav-toggle-icon{display:flex;flex-direction:column;gap:4px;width:16px;flex:0 0 auto}
.nav-toggle-icon i{display:block;height:2px;border-radius:2px;background:var(--cyan);transition:transform .26s var(--ease),opacity .26s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-text{letter-spacing:.08em}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:800;letter-spacing:.02em;
  border:1px solid transparent;
  transition:transform .26s var(--ease),box-shadow .26s var(--ease),background-color .26s var(--ease),color .26s var(--ease),border-color .26s var(--ease);
}
.btn--sm{padding:8px 16px;font-size:13px}
.btn--block{display:flex;width:100%;margin-top:18px}
.btn--cyan{background:var(--cyan);color:#05100F}
.btn--cyan:hover{box-shadow:0 0 0 1px var(--cyan),0 16px 34px -20px rgba(63,224,208,.95);transform:translateY(-1px)}
.btn--amber{background:rgba(240,160,60,.14);color:var(--amber);border-color:rgba(240,160,60,.5)}
.btn--amber:hover{background:var(--amber);color:#180D02;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--text);border-color:var(--outline)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(64px,10vw,140px);
  border-top:1px solid var(--outline);
  background:linear-gradient(180deg,#0B0F12 0%,#101619 100%);
  padding:clamp(48px,7vw,88px) 0 32px;
}
.footer-inner{width:min(1440px,100%);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr 1fr 1fr 1.15fr;
  gap:clamp(24px,3vw,48px);
}
.footer-col--brand{display:flex;flex-direction:column;gap:10px;max-width:34ch}
.footer-brand-name{font-size:22px;font-weight:900;letter-spacing:-.02em;color:var(--text)}
.footer-brand-desc{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--cyan)}
.footer-note{font-size:13.5px;line-height:1.8;color:var(--text-faint)}
.footer-col-title{
  display:flex;align-items:center;gap:8px;
  font-size:13px;font-weight:800;letter-spacing:.14em;
  color:var(--text-dim);margin-bottom:16px;
}
.footer-num{font-family:var(--font-mono);font-size:11px;color:var(--cyan);font-variant-numeric:tabular-nums}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a{
  font-size:14.5px;color:var(--text-dim);
  text-decoration:underline;text-decoration-color:rgba(242,237,228,.16);text-underline-offset:5px;
  transition:color .24s var(--ease),text-decoration-color .24s var(--ease);
}
.footer-list a:hover{color:var(--cyan);text-decoration-color:currentColor}
.footer-list--plain{gap:12px}
.footer-list--plain li{display:flex;gap:10px;font-size:13.5px;line-height:1.7;color:var(--text-dim)}
.footer-label{flex:0 0 auto;color:var(--moss);font-weight:700;font-size:12px;letter-spacing:.08em;padding-top:1px}
.footer-value{word-break:break-all}
.footer-bottom{
  margin-top:clamp(40px,6vw,72px);
  padding-top:24px;
  border-top:1px solid var(--outline);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;
  font-size:13px;color:var(--text-faint);
}
.footer-legal{font-family:var(--font-mono);letter-spacing:.04em}
.footer-legal-nav{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal-nav a{color:var(--text-dim);transition:color .24s var(--ease)}
.footer-legal-nav a:hover{color:var(--cyan)}
.footer-copy{font-family:var(--font-mono);letter-spacing:.04em}

/* ---------- 章节与文本 ---------- */
.section{padding-block:clamp(48px,7vw,104px)}
.section-head{display:flex;flex-direction:column;gap:12px;max-width:62ch;margin-bottom:clamp(28px,5vw,56px)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.75}
.section-title{font-size:clamp(28px,3.6vw,48px)}
.section-lead{color:var(--text-dim);max-width:44em}
.prose{max-width:38em;color:var(--text-dim)}
.prose p+p{margin-top:1em}
.prose strong{color:var(--text);font-weight:800}
.prose h2,.prose h3{color:var(--text);margin-top:1.6em;margin-bottom:.5em}

/* ---------- 卡片与栅格 ---------- */
.card{
  background:var(--surface);
  border:1px solid var(--outline);
  border-radius:var(--r-lg);
  padding:clamp(20px,3vw,32px);
}
.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}

/* ---------- 标签与数字 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  font-size:12px;font-weight:800;letter-spacing:.06em;
  border:1px solid var(--outline);color:var(--text-dim);
}
.tag--cool{color:var(--cool);border-color:rgba(91,200,222,.45);background:rgba(91,200,222,.1)}
.tag--neon{color:var(--neon);border-color:rgba(77,166,255,.45);background:rgba(77,166,255,.1)}
.tag--amber{color:var(--amber);border-color:rgba(240,160,60,.45);background:rgba(240,160,60,.1)}
.tag--moss{color:var(--moss);border-color:rgba(110,139,106,.5);background:rgba(110,139,106,.14)}
.big-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(40px,7vw,76px);line-height:1;letter-spacing:.02em;
  color:var(--gold);
}
.topic-line{border-left:3px solid var(--outline);border-radius:2px;padding-left:18px}
.topic-line--cool{border-left-color:var(--cool)}
.topic-line--neon{border-left-color:var(--neon)}
.topic-line--amber{border-left-color:var(--amber)}
.link-more{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14.5px;font-weight:800;color:var(--cyan);
}
.link-more::after{content:"→";transition:transform .26s var(--ease)}
.link-more:hover::after{transform:translateX(4px)}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-size:13px;color:var(--text-faint)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center}
.breadcrumb li+li::before{content:"／";margin-inline:8px;color:var(--outline)}
.breadcrumb a{
  color:var(--text-dim);
  text-decoration:underline;text-decoration-color:rgba(242,237,228,.24);text-underline-offset:4px;
}
.breadcrumb a:hover{color:var(--cyan);text-decoration-color:currentColor}
.breadcrumb [aria-current="page"]{color:var(--text)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--r-lg);border:1px solid var(--outline);
  background:linear-gradient(160deg,#161D23 0%,#0C1114 100%);
  aspect-ratio:16/10;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 52%,rgba(11,15,18,.72) 100%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin-top:10px;font-size:12.5px;color:var(--text-faint)}

/* ---------- 表格 ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--outline);border-radius:var(--r-lg);background:var(--surface-2)}
.table{min-width:520px;font-size:14.5px}
.table th,.table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--outline);vertical-align:top}
.table thead th{
  font-size:12px;font-weight:800;letter-spacing:.1em;
  color:var(--text-faint);background:var(--surface);
  position:sticky;top:0;z-index:1;
}
.table tbody tr:nth-child(even){background:rgba(255,255,255,.022)}
.table tbody tr:last-child td{border-bottom:0}
.table td strong{color:var(--gold);font-weight:800}

/* ---------- 问答块 ---------- */
.qa{
  border:1px solid var(--outline);
  border-radius:var(--r-lg);
  background:var(--surface);
  padding:0 clamp(18px,3vw,26px);
  margin-top:14px;
  transition:border-color .26s var(--ease);
}
.qa[open]{border-color:rgba(63,224,208,.4)}
.qa summary{
  display:flex;align-items:flex-start;gap:12px;
  padding:20px 0;cursor:pointer;list-style:none;
  font-size:16.5px;font-weight:800;color:var(--text);
}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{
  content:"+";margin-left:auto;flex:0 0 auto;
  font-family:var(--font-mono);font-size:18px;color:var(--cyan);
  transition:transform .26s var(--ease);
}
.qa[open] summary::after{transform:rotate(45deg)}
.qa-body{padding-bottom:22px;color:var(--text-dim);max-width:44em}
.qa-body p+p{margin-top:.9em}

/* ---------- 滚动显现 ---------- */
.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1240px){
  .brand-sub{display:none}
}
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1fr 1fr;row-gap:44px}
  .footer-col--brand{grid-column:1 / -1;max-width:52ch}
}
@media (max-width:1080px){
  .nav-block{padding:7px 10px;font-size:13px;gap:5px}
  .nav-num{font-size:10px}
  .pill{padding:7px 12px;font-size:13px}
  .btn--sm{padding:7px 14px;font-size:12.5px}
  .nav-utility{gap:6px;padding-left:10px}
}
@media (max-width:1023px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;top:100%;left:0;right:0;
    display:flex;flex-direction:column;align-items:stretch;
    gap:16px;
    padding:18px clamp(16px,4vw,40px) 24px;
    background:rgba(13,18,22,.98);
    border-bottom:1px solid var(--outline);
    box-shadow:0 34px 60px -44px rgba(0,0,0,1);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s linear;
  }
  .primary-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .nav-list{
    flex-direction:row;flex-wrap:nowrap;
    overflow-x:auto;gap:8px;
    padding-bottom:6px;
    scroll-snap-type:x proximity;
    -webkit-overflow-scrolling:touch;
  }
  .nav-list li{flex:0 0 auto;scroll-snap-align:start}
  .nav-block{padding:9px 14px;font-size:14px}
  .nav-num{font-size:11px}
  .nav-utility{
    border-left:0;border-top:1px solid var(--outline);
    padding-left:0;padding-top:16px;
    justify-content:space-between;
  }
  .header-inner{padding-block:10px}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;row-gap:36px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:14px}
  .section{padding-block:clamp(40px,9vw,64px)}
  .media-frame--wide{aspect-ratio:16/10}
}

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