/* ================= 1. 重置 ================= */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol,pre{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}

/* ================= 2. 设计令牌 ================= */
:root{
  --moonw:#F6F7F4;
  --fog:#EAEFEC;
  --ink:#17263D;
  --night:#0C1725;
  --sand:#C99B3F;
  --sand-deep:#8C6720;
  --helan:#3C6E6B;
  --helan-l:#A9C4C0;
  --silver:#65727F;
  --glow:#D9E4EC;
  --moss:#2E6B4F;
  --clay:#A34328;
  --line:rgba(23,38,61,.14);
  --line-soft:rgba(23,38,61,.08);
  --line-night:rgba(217,228,236,.14);
  --shadow-1:0 1px 0 rgba(23,38,61,.04),0 14px 30px -24px rgba(23,38,61,.55);
  --shadow-2:0 22px 44px -30px rgba(23,38,61,.62);
  --font-display:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,monospace;
  --r:4px;
  --w:1280px;
  --pad:clamp(16px,4vw,40px);
  --ease:.18s;
}

/* ================= 3. 基础排版 ================= */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--moonw);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.3;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(28px,3.4vw,40px);line-height:1.2}
h2{font-size:clamp(22px,2.4vw,28px)}
h3{font-size:20px;line-height:1.45}
h4{font-size:17px}
p{text-wrap:pretty}
strong{font-weight:700}
::selection{background:rgba(201,155,63,.28);color:var(--night)}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--sand);
  outline-offset:3px;
  border-radius:2px;
}

/* ================= 4. 工具类 ================= */
.container{width:100%;max-width:var(--w);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(40px,6vw,80px)}
.mono{font-family:var(--font-mono);letter-spacing:.06em;font-variant-numeric:tabular-nums}
.small{font-size:14px;line-height:1.7}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.rule{border:0;border-top:1px solid var(--line-soft);margin-block:24px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--sand-deep);
}
.prose{max-width:68ch;font-size:16px;line-height:1.75;color:rgba(23,38,61,.88)}
.prose p+p{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,.prose ol{margin-top:.8em;padding-left:1.25em;list-style:disc}
.prose a{color:var(--helan);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}

/* ================= 5. 头部 ================= */
.skip-link{
  position:fixed;left:16px;top:-64px;z-index:300;
  padding:10px 18px;border-radius:2px;
  background:var(--ink);color:var(--moonw);
  font-size:14px;text-decoration:none;
  transition:top var(--ease) ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:120;
  background:rgba(246,247,244,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.masthead{
  width:100%;max-width:var(--w);margin-inline:auto;
  padding:14px var(--pad) 0;
}
.masthead__row{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  padding-bottom:10px;
}
.masthead__meta{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--silver);
}
.masthead__meta-sep{display:inline-block;width:1px;height:10px;background:var(--line)}
.brand{
  display:flex;flex-direction:column;align-items:center;gap:4px;
  text-decoration:none;color:var(--ink);
  padding:2px 8px;border-radius:2px;
}
.brand__name{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(19px,2.2vw,25px);letter-spacing:.14em;
  line-height:1.2;transition:color var(--ease) ease;
}
.brand__sub{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--silver);
}
.brand:hover .brand__name{color:var(--helan)}

.masthead__actions{
  display:flex;align-items:center;justify-content:flex-end;gap:12px;
  flex-wrap:wrap;
}
.status{
  display:inline-flex;align-items:center;gap:7px;
  font-size:13px;color:var(--silver);white-space:nowrap;
}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--silver);flex:none}
.dot--ok{background:var(--moss);box-shadow:0 0 0 3px rgba(46,107,79,.14)}
.dot--warn{background:var(--clay);box-shadow:0 0 0 3px rgba(163,67,40,.13)}
.dot--sand{background:var(--sand);box-shadow:0 0 0 3px rgba(201,155,63,.18)}
.masthead__help{
  font-size:13px;color:var(--ink);text-decoration:none;
  padding:5px 12px;border:1px solid var(--line);border-radius:999px;
  transition:border-color var(--ease) ease,color var(--ease) ease;
}
.masthead__help:hover{border-color:var(--helan);color:var(--helan)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 13px;border:1px solid var(--line);border-radius:2px;
  background:var(--moonw);color:var(--ink);
  font-size:14px;cursor:pointer;
  transition:border-color var(--ease) ease,color var(--ease) ease;
}
.nav-toggle:hover{border-color:var(--helan);color:var(--helan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3.5px;width:16px}
.nav-toggle__bars span{display:block;width:16px;height:1.5px;background:currentColor;transition:transform var(--ease) ease,opacity var(--ease) ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.site-nav{
  display:flex;justify-content:center;flex-wrap:wrap;gap:0;
  border-top:1px solid var(--line-soft);
  padding-top:4px;
}
.site-nav__link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:7px;
  padding:12px 15px 10px;
  font-size:15px;font-weight:500;color:var(--ink);text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color var(--ease) ease,border-color var(--ease) ease,background-color var(--ease) ease;
}
.site-nav__num{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--silver);transition:color var(--ease) ease;
}
.site-nav__link:hover{color:var(--helan);border-bottom-color:var(--helan-l);background:rgba(169,196,192,.14)}
.site-nav__link:hover .site-nav__num{color:var(--helan)}
.site-nav__link[aria-current="page"]{border-bottom-color:var(--sand);color:var(--ink)}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--sand-deep)}
.site-nav__link--accent{
  color:var(--sand-deep);
  background:linear-gradient(180deg,rgba(201,155,63,.17),rgba(201,155,63,.05));
  box-shadow:inset 0 0 0 1px rgba(201,155,63,.42),inset 0 -2px 0 var(--sand);
}
.site-nav__link--accent .site-nav__num{color:var(--sand-deep)}
.site-nav__link--accent:hover{background:linear-gradient(180deg,rgba(201,155,63,.26),rgba(201,155,63,.1));color:var(--night)}

.batch-bar{background:var(--ink);color:#DCE5EA;border-top:1px solid rgba(217,228,236,.1)}
.batch-bar__inner{
  width:100%;max-width:var(--w);margin-inline:auto;
  padding:7px var(--pad);
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  font-size:12.5px;line-height:1.6;
}
.batch-bar .mono{color:var(--sand);font-size:12px}
.batch-bar__text{color:#B9C7CE}
.batch-bar__link{
  color:#E7EDEA;text-decoration:none;font-size:12.5px;
  padding:1px 9px;border:1px solid rgba(217,228,236,.28);border-radius:999px;
  transition:border-color var(--ease) ease,color var(--ease) ease;
}
.batch-bar__link:hover{border-color:var(--sand);color:var(--sand)}
.batch-bar__close{
  margin-left:auto;cursor:pointer;font-size:12px;line-height:1.5;
  padding:2px 10px;border-radius:999px;
  border:1px solid rgba(217,228,236,.22);color:#9FB0B7;
  transition:color var(--ease) ease,border-color var(--ease) ease;
}
.batch-bar__close:hover{color:var(--moonw);border-color:rgba(217,228,236,.55)}

.scroll-progress{height:2px;background:rgba(217,228,236,.55)}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--helan),var(--sand));
  transition:width .12s linear;
}

/* ================= 6. 页脚 ================= */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--night);color:#C2CDD2;
  margin-top:clamp(48px,7vw,96px);
}
.site-footer::before{
  content:"";position:absolute;right:-140px;top:-180px;
  width:420px;height:420px;border-radius:50%;
  border:1px solid rgba(217,228,236,.13);
  box-shadow:0 0 0 48px rgba(217,228,236,.028),0 0 0 96px rgba(217,228,236,.018);
  pointer-events:none;
}
.footer__inner{
  position:relative;z-index:1;
  width:100%;max-width:var(--w);margin-inline:auto;
  padding:56px var(--pad) 0;
}
.footer__grid{
  display:grid;grid-template-columns:repeat(5,1fr);
  gap:34px 24px;
  padding-bottom:36px;
  border-bottom:1px solid var(--line-night);
}
.footer__col-title{
  display:flex;align-items:baseline;gap:8px;
  font-family:var(--font-mono);font-weight:400;
  font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--sand);margin-bottom:14px;
}
.footer__col-num{color:rgba(201,155,63,.62)}
.footer__links li+li{margin-top:10px}
.footer__link{
  color:#C2CDD2;font-size:14px;text-decoration:none;
  transition:color var(--ease) ease;
}
.footer__link:hover{
  color:#FFFFFF;
  text-decoration:underline;text-underline-offset:4px;
  text-decoration-color:var(--sand);text-decoration-thickness:1px;
}
.footer__link--inline{color:#DDE6EA;margin-inline:2px}
.footer__band{
  display:grid;grid-template-columns:1.15fr 1fr;gap:36px;
  padding:36px 0;
  border-bottom:1px solid var(--line-night);
}
.footer__brandname{
  font-family:var(--font-display);font-weight:700;
  font-size:20px;letter-spacing:.14em;color:var(--moonw);
}
.footer__tagline{margin-top:10px;font-size:14px;line-height:1.75;color:#96A7AF;max-width:34ch}
.footer__contact-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--sand);margin-bottom:10px;
}
.footer__contact-line{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-size:14px;line-height:1.7;color:#C2CDD2;
}
.footer__contact-line+.footer__contact-line{margin-top:7px}
.footer__email{color:#E7EDEA;font-size:13.5px;letter-spacing:.02em}
.footer__note{margin-top:12px;font-size:12.5px;line-height:1.7;color:#7E8F97;max-width:44ch}
.copy-btn{
  cursor:pointer;font-size:12px;line-height:1.5;
  padding:2px 10px;border-radius:999px;
  border:1px solid rgba(201,155,63,.45);
  color:var(--sand);background:transparent;
  transition:background-color var(--ease) ease,color var(--ease) ease,border-color var(--ease) ease;
}
.copy-btn:hover{background:rgba(201,155,63,.16);color:#F0D9A6}
.copy-btn[data-copied]{border-color:rgba(46,107,79,.6);color:#9FD3B8}
.footer__legal{
  display:flex;align-items:center;flex-wrap:wrap;gap:10px 18px;
  padding:22px 0 30px;
  font-size:12.5px;color:#7E8F97;
}
.footer__legal-link{color:#A9BBC2;text-decoration:none;transition:color var(--ease) ease}
.footer__legal-link:hover{color:var(--sand);text-decoration:underline;text-underline-offset:3px}
.footer__legal-sep{display:inline-block;width:1px;height:11px;background:rgba(217,228,236,.2)}
.footer__copy{color:#7E8F97;font-family:var(--font-mono);letter-spacing:.06em}

/* ================= 7. 通用组件 ================= */
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:32px}

.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;
  padding-bottom:14px;margin-bottom:26px;
  border-bottom:1px solid var(--line-soft);
}
.section-head__title{font-size:clamp(20px,2.4vw,28px)}
.section-head__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--silver)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:2px;cursor:pointer;
  font-size:15px;font-weight:600;text-decoration:none;
  border:1px solid transparent;
  transition:transform var(--ease) ease,background-color var(--ease) ease,border-color var(--ease) ease,color var(--ease) ease,box-shadow var(--ease) ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--ink);color:var(--moonw)}
.btn--primary:hover{background:#0F1D30;box-shadow:var(--shadow-2)}
.btn--ghost{border-color:var(--line);color:var(--ink);background:transparent}
.btn--ghost:hover{border-color:var(--helan);color:var(--helan)}
.btn--sand{
  border-color:rgba(201,155,63,.55);color:var(--sand-deep);
  background:rgba(201,155,63,.09);
}
.btn--sand:hover{background:rgba(201,155,63,.18);border-color:var(--sand)}
.btn--sm{padding:8px 14px;font-size:13.5px}

.card{
  position:relative;
  background:#FFFFFF;border:1px solid var(--line-soft);border-radius:var(--r);
  padding:22px;box-shadow:var(--shadow-1);
  transition:transform var(--ease) ease,border-color var(--ease) ease,box-shadow var(--ease) ease;
}
.card:hover{transform:translateY(-1px);border-color:var(--helan-l);box-shadow:var(--shadow-2)}
.card__num{
  display:block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.1em;color:var(--sand-deep);margin-bottom:10px;
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  padding:3px 10px;border-radius:999px;
  border:1px solid var(--line);color:var(--silver);
}
.tag--ok{color:var(--moss);border-color:rgba(46,107,79,.35);background:rgba(46,107,79,.07)}
.tag--warn{color:var(--clay);border-color:rgba(163,67,40,.35);background:rgba(163,67,40,.06)}
.tag--sand{color:var(--sand-deep);border-color:rgba(201,155,63,.45);background:rgba(201,155,63,.1)}

.panel{
  background:var(--ink);color:#E4EBEE;
  border:1px solid rgba(217,228,236,.14);border-radius:var(--r);
  padding:clamp(20px,3vw,32px);
}
.panel h2,.panel h3{color:var(--moonw)}
.panel a{color:var(--sand)}
.panel a:hover{color:#E8C87F}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;color:var(--silver);
  margin-bottom:20px;
}
.breadcrumb a{color:var(--helan);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline;text-underline-offset:3px}
.breadcrumb__sep{color:var(--helan-l)}

.figure{margin:0}
.figure__frame{
  position:relative;overflow:hidden;border-radius:var(--r);
  border:1px solid var(--line-soft);
  background:
    radial-gradient(circle at 78% 18%,rgba(217,228,236,.9),transparent 55%),
    linear-gradient(145deg,var(--glow),var(--fog) 48%,var(--moonw));
  aspect-ratio:16/9;
}
.figure__frame img,
.figure__frame picture>img{
  display:block;width:100%;height:100%;object-fit:cover;
}
.figure__frame--wide{aspect-ratio:21/9}
.figure__frame--square{aspect-ratio:1/1}
.figure__frame--round{aspect-ratio:1/1;border-radius:50%}
.figure__cap{
  margin-top:10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--silver);
}

/* ================= 8. 响应式 ================= */
@media (max-width:1100px){
  .grid--split{grid-template-columns:1fr;gap:28px}
  .footer__grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .masthead{padding-top:10px}
  .masthead__row{grid-template-columns:1fr auto;gap:10px;padding-bottom:8px}
  .masthead__meta{display:none}
  .brand{justify-self:start;align-items:flex-start;padding-left:0}
  .brand__sub{letter-spacing:.2em}
  .masthead__actions{gap:10px}
  .status{display:none}
  .site-nav{
    display:none;flex-direction:column;justify-content:flex-start;
    gap:0;margin-top:6px;padding-top:6px;
    border-top:1px solid var(--line-soft);
  }
  .site-nav[data-open]{display:flex}
  .site-nav__link{
    width:100%;justify-content:flex-start;
    padding:12px 8px;border-bottom:1px solid var(--line-soft);
  }
  .site-nav__link:last-child{border-bottom:0}
  .site-nav__link--accent{box-shadow:inset 0 0 0 1px rgba(201,155,63,.42);border-left:2px solid var(--sand)}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}
  .footer__band{grid-template-columns:1fr;gap:26px}
  .footer__inner{padding-top:44px}
  .batch-bar__close{margin-left:0}
}
@media (max-width:640px){
  .masthead__help{display:none}
  .brand__name{font-size:19px;letter-spacing:.1em}
  .batch-bar__inner{font-size:12px;gap:8px}
  .batch-bar__text{flex:1 1 100%;order:3}
  .site-footer::before{width:300px;height:300px;right:-120px;top:-140px}
  .footer__legal{gap:8px 14px;font-size:12px}
  .footer__legal-sep{display:none}
}

/* ================= 9. 动效降级 ================= */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .scroll-progress__bar{transition:none}
  .btn:hover,.card:hover{transform:none}
}