/* ===== 1. 设计变量 ===== */
:root{
  --ink:#071A16;
  --ink-2:#0C2A23;
  --pine:#16463A;
  --cyan:#39F2D0;
  --cyan-soft:#A8F5E8;
  --amber:#F2B84B;
  --paper:#F4EFE3;
  --paper-2:#E8DFCB;
  --text:#121916;
  --ash:#8FA99E;
  --red:#D64545;
  --yellow:#E2B33C;
  --line:rgba(7,26,22,.14);
  --line-soft:rgba(7,26,22,.08);
  --line-dark:rgba(168,245,232,.18);
  --focus:#16463A;
  --font-display:'Noto Sans SC','Source Han Sans SC',system-ui,'Segoe UI',sans-serif;
  --font-body:'Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono','Roboto Mono','SFMono-Regular',Consolas,monospace;
  --r-pill:999px;
  --r-md:14px;
  --r-sm:8px;
  --shadow-soft:0 10px 30px rgba(7,26,22,.10);
  --shadow-lift:0 18px 44px rgba(7,26,22,.22);
  --shell:1200px;
  --gutter:clamp(16px,4vw,44px);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ===== 2. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}
html,body{height:100%}

/* ===== 3. 基础中文排版 ===== */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.012em;
  text-wrap:balance;
}
h1{font-size:clamp(30px,4.6vw,52px);line-height:1.08}
h2{font-size:clamp(22px,2.8vw,31px);line-height:1.25}
h3{font-size:clamp(17px,1.7vw,20px);line-height:1.4}
p{max-width:72ch}
a{text-decoration-thickness:1px;text-underline-offset:3px}
::selection{background:var(--cyan);color:var(--ink)}

/* ===== 4. 无障碍基础 ===== */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:220;
  transform:translateY(-180%);
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-body);font-weight:700;font-size:14px;
  padding:10px 20px;border-radius:var(--r-pill);text-decoration:none;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--focus);
  outline-offset:3px;
  border-radius:4px;
}
.site-footer :focus-visible,
.panel--ink :focus-visible,
.nav-pill :focus-visible,
.nav-toggle:focus-visible{
  outline-color:var(--cyan);
}

/* ===== 5. 头部：浮岛式胶囊导航 ===== */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--paper);
  border-bottom:1px solid var(--line-soft);
  padding:12px 0;
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  opacity:0;transition:opacity .2s var(--ease);
  pointer-events:none;
}
.site-header__inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
  display:flex;align-items:center;gap:clamp(8px,1.6vw,18px);
}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  padding:7px 18px 7px 7px;border-radius:var(--r-pill);
  background:var(--ink);color:var(--paper);text-decoration:none;
  box-shadow:0 6px 18px rgba(7,26,22,.20);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
  flex:0 0 auto;
}
.brand:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(7,26,22,.26)}
.brand__mark{
  display:grid;place-items:center;width:30px;height:30px;flex:0 0 auto;
  border-radius:9px;background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.04em;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;gap:2px}
.brand__name{font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.02em;color:var(--paper)}
.brand__tagline{font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;color:rgba(168,245,232,.72);white-space:nowrap}

.nav-pill{
  margin-inline:auto;
  background:var(--ink-2);
  border-radius:var(--r-pill);
  padding:5px;
  box-shadow:inset 0 0 0 1px rgba(168,245,232,.10),0 8px 22px rgba(7,26,22,.16);
}
.nav-pill__list{display:flex;align-items:center;gap:2px}
.nav-pill__link{
  display:inline-block;padding:8px 14px;border-radius:var(--r-pill);
  font-size:13.5px;font-weight:500;white-space:nowrap;text-decoration:none;
  color:rgba(168,245,232,.80);
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.nav-pill__link:hover{background:rgba(57,242,208,.14);color:var(--cyan)}
.nav-pill__link[aria-current="page"]{background:var(--cyan);color:var(--ink);font-weight:700}

.header-tools{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.tool-link{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--pine);text-decoration:none;padding:7px 13px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:rgba(232,223,203,.65);
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.tool-link:hover{background:var(--paper-2);border-color:var(--pine);color:var(--ink)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  font-family:var(--font-body);font-size:13px;font-weight:600;
  color:var(--paper);background:var(--ink);border:1px solid var(--ink);
  border-radius:var(--r-pill);padding:9px 16px;cursor:pointer;
  transition:background-color .18s var(--ease);
}
.nav-toggle:hover{background:var(--pine);border-color:var(--pine)}
.nav-toggle__bars{position:relative;display:block;width:14px;height:2px;background:var(--cyan);box-shadow:0 -5px 0 var(--cyan),0 5px 0 var(--cyan);transition:transform .18s var(--ease),box-shadow .18s var(--ease)}
.nav-toggle__bars::after{content:"";position:absolute;inset:0;background:var(--cyan);transform:rotate(90deg) scaleX(0);transition:transform .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{transform:rotate(45deg);box-shadow:none}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:rotate(90deg) scaleX(1)}
.nav-toggle__label{line-height:1}

/* ===== 6. 页脚 ===== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(36px,5vw,64px) 0 26px;
  background:var(--ink);
  color:rgba(168,245,232,.82);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--cyan) 0%,rgba(57,242,208,.35) 38%,rgba(57,242,208,0) 78%);
}
.site-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.7fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,3vw,44px);
}
.site-footer__brandcol{display:flex;flex-direction:column;gap:14px}
.brand--footer{background:transparent;box-shadow:none;padding:0;gap:10px;align-self:flex-start}
.brand--footer:hover{transform:none;box-shadow:none}
.brand--footer .brand__mark{width:32px;height:32px}
.site-footer__summary{font-size:14px;line-height:1.8;color:rgba(168,245,232,.76);max-width:36ch}
.site-footer__service{font-family:var(--font-mono);font-size:11.5px;line-height:1.7;letter-spacing:.02em;color:rgba(168,245,232,.48);max-width:38ch}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.18em;
  color:var(--cyan);margin:0 0 14px;
}
.footer-col__list{display:grid;gap:9px}
.footer-col__link{
  font-size:14px;color:rgba(168,245,232,.82);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-col__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.site-footer__contact{
  margin-top:clamp(28px,4vw,46px);
  padding-top:clamp(18px,3vw,26px);
  border-top:1px solid var(--line-dark);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));
  gap:12px 26px;
}
.contact-item{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;font-size:13.5px;margin:0;max-width:none}
.contact-item__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(168,245,232,.52);min-width:4.6em;
}
.copy-btn{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.02em;
  color:var(--cyan-soft);background:rgba(57,242,208,.07);
  border:1px solid rgba(57,242,208,.22);border-radius:var(--r-sm);
  padding:5px 10px;cursor:pointer;text-align:left;overflow-wrap:anywhere;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.copy-btn:hover{background:rgba(57,242,208,.16);border-color:var(--cyan);color:var(--cyan)}
.copy-btn.is-copied{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}
.copy-btn--quiet{background:transparent;border-color:transparent;color:rgba(168,245,232,.62);padding:4px 6px}
.copy-btn--quiet:hover{background:rgba(57,242,208,.10);border-color:transparent;color:var(--cyan)}
.site-footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 20px;margin-top:clamp(20px,3vw,32px);
  padding-top:18px;border-top:1px solid rgba(168,245,232,.12);
}
.legal-note{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:rgba(168,245,232,.52);margin:0;max-width:none}

/* ===== 7. 布局工具 ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(36px,5vw,72px)}
.section--tight{padding-block:clamp(22px,3vw,40px)}
.section--tint{background:var(--paper-2)}
.section--ink{background:var(--ink);color:rgba(168,245,232,.86)}
.section--ink h1,.section--ink h2,.section--ink h3{color:var(--paper)}
.grid{display:grid;gap:clamp(14px,2.2vw,26px);grid-template-columns:minmax(0,1fr)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(200px,264px) minmax(0,1fr);align-items:start}

/* ===== 8. 通用组件 ===== */
.eyebrow{
  display:inline-block;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.2em;color:var(--ash);margin:0 0 10px;
}
.section--ink .eyebrow,.panel--ink .eyebrow{color:rgba(57,242,208,.85)}
.lede{font-size:clamp(15px,1.4vw,17px);line-height:1.82;color:rgba(18,25,22,.78);max-width:62ch}
.section--ink .lede{color:rgba(168,245,232,.80)}
.prose{max-width:70ch}
.prose p{margin-bottom:1.05em;line-height:1.85}
.prose h2{margin:1.9em 0 .7em}
.prose h3{margin:1.5em 0 .55em}
.prose ul{list-style:none;display:grid;gap:.5em;margin:0 0 1.1em}
.prose ul li{position:relative;padding-left:1.15em;line-height:1.8}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:2px;background:var(--pine)}
.rule{height:1px;background:var(--line);border:0;margin-block:clamp(16px,2.4vw,28px)}
.section--ink .rule,.panel--ink .rule{background:var(--line-dark)}
.tag{
  display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--pine);background:rgba(22,70,58,.10);border-radius:6px;padding:3px 9px;
}
.panel--ink .tag{color:var(--cyan);background:rgba(57,242,208,.12)}
.chip{
  display:inline-flex;align-items:center;gap:.45em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--pine);background:transparent;border:1px solid var(--line);
  border-radius:var(--r-pill);padding:6px 13px;cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.chip:hover{border-color:var(--pine);background:rgba(22,70,58,.07)}
.chip--on{background:var(--pine);border-color:var(--pine);color:var(--paper)}
.panel{
  background:var(--paper-2);border:1px solid var(--line);
  border-radius:var(--r-md);padding:clamp(16px,2.2vw,26px);
  box-shadow:0 2px 0 rgba(7,26,22,.04);
}
.panel--ink{background:var(--ink-2);border-color:var(--line-dark);color:rgba(168,245,232,.86)}
.panel__title{font-family:var(--font-display);font-size:clamp(16px,1.6vw,19px);font-weight:700;margin:0 0 10px;letter-spacing:-.01em}
.panel--ink .panel__title{color:var(--paper)}
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-body);font-size:14px;font-weight:600;
  padding:11px 22px;border-radius:var(--r-pill);border:1px solid transparent;
  text-decoration:none;cursor:pointer;
  transition:transform .16s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--solid{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.btn--solid:hover{background:var(--cyan-soft);border-color:var(--cyan-soft)}
.btn--ink{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn--ink:hover{background:var(--pine);border-color:var(--pine)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--pine);color:var(--pine)}
.btn--ghost-dark{background:transparent;border-color:rgba(57,242,208,.32);color:var(--cyan-soft)}
.btn--ghost-dark:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--mini{font-size:12.5px;padding:7px 15px;font-family:var(--font-mono);letter-spacing:.03em}
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--ash);margin:0 0 18px;
}
.crumb a{color:var(--pine);text-decoration:none;border-bottom:1px solid transparent}
.crumb a:hover{border-bottom-color:var(--cyan)}
.crumb__sep{color:rgba(143,169,158,.55)}
.score{display:inline-flex;align-items:baseline;gap:7px;font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.score__num{font-size:clamp(26px,3.4vw,42px);font-weight:700;line-height:1;color:var(--amber);letter-spacing:-.01em}
.score__meta{font-size:11.5px;letter-spacing:.1em;color:var(--ash)}
.section--ink .score__meta,.panel--ink .score__meta{color:rgba(168,245,232,.62)}
.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(20px,2.4vw,28px);font-weight:700;line-height:1;color:var(--amber)}
.stat__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--ash)}
.panel--ink .stat__label,.section--ink .stat__label{color:rgba(168,245,232,.6)}

/* ===== 9. 图片容器基础（供页面阶段使用） ===== */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border-radius:var(--r-md);border:1px solid var(--line);
  background:linear-gradient(150deg,var(--ink-2),var(--ink));
  min-height:140px;
}
.media-frame__img{
  display:block;width:100%;height:100%;aspect-ratio:16/9;
  object-fit:cover;filter:saturate(.92) contrast(1.06) brightness(.92);
}
.media-frame[data-grid="on"]::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(57,242,208,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(57,242,208,.16) 1px,transparent 1px);
  background-size:34px 34px;
  mix-blend-mode:screen;
}
.media-frame__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--cyan-soft);background:linear-gradient(180deg,rgba(7,26,22,0),rgba(7,26,22,.86));
}

/* ===== 10. 响应式 ===== */
@media (max-width:1180px){
  .nav-pill__link{padding:8px 11px;font-size:13px}
}
@media (max-width:1060px){
  .brand__tagline{display:none}
}
@media (max-width:960px){
  .tool-link{display:none}
  .nav-toggle{display:inline-flex}
  .site-header__inner{gap:10px}
  .nav-pill{
    position:fixed;left:14px;right:14px;bottom:16px;top:auto;
    display:block;max-height:72vh;overflow:auto;
    margin-inline:0;padding:10px;border-radius:22px;
    background:rgba(7,26,22,.98);
    box-shadow:var(--shadow-lift),inset 0 0 0 1px rgba(168,245,232,.14);
    transform:translateY(calc(100% + 40px));
    visibility:hidden;opacity:0;
    transition:transform .24s var(--ease),opacity .2s var(--ease),visibility .24s var(--ease);
  }
  .nav-pill[data-open="true"]{transform:translateY(0);visibility:visible;opacity:1}
  .nav-pill__list{display:grid;grid-template-columns:1fr 1fr;gap:6px}
  .nav-pill__link{display:block;padding:13px 15px;border-radius:13px;font-size:15px}
}
@media (max-width:860px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .grid--aside{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:760px){
  .site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__brandcol{grid-column:1 / -1}
}
@media (max-width:560px){
  .site-footer__grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .nav-pill__list{grid-template-columns:minmax(0,1fr)}
  .site-footer__legal{justify-content:flex-start}
  .contact-item{flex-direction:column;gap:6px}
  .contact-item__label{min-width:0}
}

/* ===== 11. 动效偏好 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .brand:hover,.btn:hover{transform:none}
}