/* ============ 01 重置 ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
@media (prefers-reduced-motion: no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}

/* ============ 02 变量 ============ */
:root{
  --paper:#F5EFE2;
  --paper-2:#EFE7D6;
  --ink:#14111C;
  --ink-2:#241B3B;
  --violet:#7A3BFF;
  --cyan:#17D8CE;
  --orange:#FF7A2F;
  --gold:#F2B70A;
  --moss:#2E6B4F;
  --mist:#6B6675;
  --glass:rgba(255,255,255,.66);
  --line:rgba(20,17,28,.16);
  --line-strong:rgba(20,17,28,.42);
  --line-invert:rgba(245,239,226,.18);

  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --fs-body:16.5px;
  --lh-body:1.8;
  --fs-index:.78rem;
  --track-index:.08em;

  --u:8px;
  --rail-w:88px;
  --topbar-h:64px;
  --topbar-h-min:52px;
  --wrap:1200px;
  --wrap-pad: clamp(20px, 4vw, 56px);
  --shadow-hard: 4px 4px 0 var(--ink);
  --dur:.32s;
  --ease:cubic-bezier(.2,.7,.2,1);
}
@media (max-width:767.98px){:root{--topbar-h:56px}}

/* ============ 03 排版基线 ============ */
body{
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(90deg, rgba(20,17,28,.035) 1px, transparent 1px),
    linear-gradient(0deg, rgba(20,17,28,.035) 1px, transparent 1px);
  background-size:8px 8px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-weight:300;line-height:1.18;letter-spacing:-.01em}
strong,b{font-weight:700}
::selection{background:var(--violet);color:#fff}
.mono{font-family:var(--font-mono);font-size:var(--fs-index);letter-spacing:var(--track-index)}
.measure{max-width:36em}
.display{font-size:clamp(2.4rem,7vw,5rem);font-weight:200;line-height:1.04;letter-spacing:-.02em}
.display--xl{font-size:clamp(3rem,10vw,6rem)}
.display--sm{font-size:clamp(1.7rem,4vw,2.6rem);font-weight:300}
.lede{font-size:1.06rem;line-height:1.85;color:#3A3546;max-width:34em}
.eyebrow{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;color:var(--mist)}
.eyebrow::before{content:"";flex:0 0 auto;width:24px;height:2px;background:var(--orange)}
.prose{max-width:38em}
.prose p + p{margin-top:1em}
.prose h2{margin-top:2em;font-size:1.5rem;font-weight:400}
.prose h3{margin-top:1.6em;font-size:1.16rem;font-weight:700}
.prose ul{display:grid;gap:.6em;margin-top:1em}
.prose li{position:relative;padding-left:1.5em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;background:var(--cyan)}
.prose a{color:var(--violet);text-decoration:underline;text-underline-offset:3px}

/* ============ 04 布局骨架 ============ */
#main-content{display:block;padding-top:var(--topbar-h);min-height:60vh}
@media (min-width:1024px){#main-content{padding-left:var(--rail-w)}}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--wrap-pad)}
.wrap--narrow{max-width:820px}
.section{padding-block:clamp(48px,7vw,96px)}
.section--paper-2{background:var(--paper-2)}
.section--deep{background:var(--ink);color:var(--paper)}
.section--deep .lede{color:rgba(245,239,226,.78)}
.section--deep .eyebrow{color:var(--cyan)}
.section--violet{background:var(--violet);color:#fff}
.section--violet .eyebrow{color:var(--gold)}
.section--violet .eyebrow::before{background:var(--gold)}
.grid{display:grid;gap:clamp(16px,2.4vw,32px);grid-template-columns:minmax(0,1fr)}
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--stagger > *:nth-child(even){margin-top:clamp(16px,3vw,44px)}
}

/* ============ 05 通用组件 ============ */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;font-size:.92rem;font-weight:700;letter-spacing:.02em;
  border:2px solid var(--ink);background:var(--paper);color:var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .16s var(--ease), box-shadow .16s var(--ease), background-color .16s var(--ease);
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.btn--gold{background:var(--gold)}
.btn--orange{background:var(--orange)}
.btn--violet{background:var(--violet);color:#fff}
.btn--ghost{background:transparent;box-shadow:none;border-color:currentColor}
.btn--ghost:hover{background:rgba(122,59,255,.14);box-shadow:none;transform:none}
.btn--sm{padding:8px 12px;font-size:.82rem}
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--line-strong);background:rgba(255,255,255,.55);color:var(--mist)}
.tag--cyan{border-color:var(--cyan);background:rgba(23,216,206,.14);color:#0B6E68}
.tag--violet{border-color:var(--violet);background:rgba(122,59,255,.1);color:var(--violet)}
.tag--moss{border-color:var(--moss);background:rgba(46,107,79,.12);color:var(--moss)}
.badge{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:26px;padding:0 6px;background:var(--orange);color:var(--ink);border:2px solid var(--ink);font-family:var(--font-mono);font-size:.78rem;font-weight:700}
.card{background:#fff;border:2px solid var(--ink);padding:clamp(18px,2.4vw,28px);box-shadow:6px 6px 0 rgba(20,17,28,.14)}
.card--ink{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.card--glass{background:var(--glass);color:var(--paper);border:2px solid rgba(245,239,226,.35);box-shadow:none;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.card--glass .lede,.card--glass p{color:rgba(245,239,226,.86)}
.card--glass .eyebrow{color:var(--cyan)}
.card__head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:12px}
.card__title{font-size:1.18rem;font-weight:700;line-height:1.4}
.band{background:var(--ink-2);color:var(--paper);padding-block:28px;border-block:1px solid var(--line-invert)}
.band__track{display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px var(--wrap-pad) 18px;overscroll-behavior-x:contain}
.band__item{flex:0 0 min(320px,78vw);scroll-snap-align:start}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding-block:18px;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--mist)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item + .breadcrumb__item::before{content:"／";color:var(--line-strong)}
.breadcrumb a:hover{color:var(--violet);text-decoration:underline;text-underline-offset:3px}
.media{position:relative;display:block;overflow:hidden;border:2px solid var(--ink);background-color:var(--ink-2);
  background-image:
    linear-gradient(90deg, rgba(122,59,255,.35) 1px, transparent 1px),
    linear-gradient(0deg, rgba(122,59,255,.35) 1px, transparent 1px);
  background-size:16px 16px}
.media > img,.media > picture > img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media--glass{border-color:rgba(245,239,226,.4);background-color:rgba(36,27,59,.55);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.media__cap{margin-top:8px;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--mist)}

/* ============ 06 玻璃 / 扫描线 / 显现 ============ */
.scanlines::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:5;
  background:repeating-linear-gradient(to bottom, rgba(255,255,255,.055) 0 1px, transparent 1px 3px);
}
[data-reveal]{transition:opacity var(--dur) var(--ease), transform var(--dur) var(--ease)}
.js [data-reveal]{opacity:0;transform:translateY(12px)}
[data-reveal].is-visible{opacity:1;transform:translateY(0)}

/* ============ 07 跳转链接与焦点 ============ */
.skip-link{position:fixed;top:-100px;left:16px;z-index:200;padding:10px 16px;background:var(--gold);color:var(--ink);border:2px solid var(--ink);font-weight:700;transition:top .18s var(--ease)}
.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
.rail :focus-visible,.site-footer :focus-visible,.section--deep :focus-visible,.section--violet :focus-visible{outline-color:var(--cyan)}

/* ============ 08 顶部悬浮栏 ============ */
.site-header{position:relative;z-index:80}
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:rgba(245,239,226,.94);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-bottom:2px solid var(--ink);
}
.topbar__inner{
  display:flex;align-items:center;gap:12px;
  height:var(--topbar-h);padding-inline:16px;
  transition:height .24s var(--ease);
}
.topbar__meta{display:none;margin-left:24px;font-size:.78rem;letter-spacing:.04em;color:var(--mist);white-space:nowrap;transition:opacity .24s var(--ease),visibility .24s}
.topbar__cta{margin-left:auto;flex:0 0 auto;padding:9px 14px;font-size:.84rem}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__mark{width:14px;height:14px;flex:0 0 auto;background:linear-gradient(135deg,var(--violet) 0 50%, var(--cyan) 50% 100%);box-shadow:2px 2px 0 var(--ink)}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-size:.96rem;font-weight:700;letter-spacing:.02em}
.brand__sub{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.18em;color:var(--mist);transition:opacity .24s var(--ease)}
.brand--footer .brand__mark{box-shadow:2px 2px 0 var(--gold)}
.brand--footer .brand__sub{color:rgba(245,239,226,.6)}
.topbar[data-condensed] .topbar__inner{height:var(--topbar-h-min)}
.topbar[data-condensed] .topbar__meta{opacity:0;visibility:hidden}
.topbar[data-condensed] .brand__sub{opacity:0}
.scroll-progress{position:absolute;left:0;right:0;bottom:-2px;height:2px;background:rgba(20,17,28,.12);overflow:hidden}
.scroll-progress__bar{display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:left center;background:linear-gradient(90deg,var(--violet),var(--cyan) 60%,var(--gold));transition:transform .12s linear}
@media (min-width:768px){.topbar__meta{display:block}}
@media (min-width:1024px){.topbar__inner{padding-left:calc(var(--rail-w) + 28px);padding-right:28px}}

/* ============ 09 轨道导航 ============ */
.rail{
  position:fixed;top:0;left:0;z-index:70;
  width:var(--rail-w);height:100vh;height:100dvh;
  display:flex;flex-direction:column;justify-content:space-between;
  padding-top:calc(var(--topbar-h) + 28px);
  background:var(--ink);color:var(--paper);
  border-right:1px solid var(--line-invert);
}
.rail__list{display:flex;flex-direction:column}
.rail__item{border-bottom:1px solid rgba(245,239,226,.1)}
.rail__link{position:relative;display:flex;align-items:center;justify-content:center;min-height:62px;padding:10px 8px;font-size:.78rem;line-height:1.35;text-align:center;color:rgba(245,239,226,.62);transition:color .18s var(--ease),background-color .18s var(--ease)}
.rail__label{display:block}
.rail__link::before{content:"";position:absolute;left:0;top:50%;width:4px;height:0;background:var(--cyan);transform:translateY(-50%);transition:height .2s var(--ease)}
.rail__link:hover{color:var(--paper);background:var(--ink-2)}
.rail__link:hover::before{height:14px}
.rail__link[aria-current="page"]{color:var(--paper);font-weight:700;background:linear-gradient(90deg,rgba(23,216,206,.18),rgba(122,59,255,.08))}
.rail__link[aria-current="page"]::before{height:26px}
.rail__foot{display:flex;justify-content:center;padding:20px 0 24px}
.rail__dots{display:block;width:8px;height:44px;background-image:repeating-linear-gradient(180deg,var(--cyan) 0 4px, transparent 4px 8px);opacity:.55}

/* ============ 10 移动抽屉与按钮 ============ */
.nav-toggle{display:none}
.drawer-scrim{position:fixed;inset:0;z-index:95;background:rgba(20,17,28,.62);opacity:0;visibility:hidden;transition:opacity .2s var(--ease),visibility .2s}
.drawer-scrim[data-open]{opacity:1;visibility:visible}
body.nav-open{overflow:hidden}
@media (min-width:1024px){.drawer-scrim{display:none}}
@media (max-width:1023.98px){
  .rail{
    top:0;left:auto;right:0;
    width:min(320px,86vw);height:100vh;height:100dvh;
    padding-top:0;padding-bottom:24px;
    justify-content:flex-start;overflow-y:auto;
    border-right:0;border-left:2px solid var(--cyan);
    transform:translateX(102%);transition:transform .3s var(--ease);z-index:100;
  }
  .rail[data-open]{transform:translateX(0)}
  .rail__list{padding-top:24px}
  .rail__item{border-bottom:1px solid rgba(245,239,226,.1)}
  .rail__link{justify-content:flex-start;min-height:56px;padding:14px 24px;font-size:.98rem;letter-spacing:.04em;text-align:left;color:rgba(245,239,226,.78)}
  .rail__foot{margin-top:auto;padding-top:24px}
  .nav-toggle{
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
    position:fixed;right:16px;bottom:16px;z-index:110;
    width:64px;height:64px;
    background:var(--ink);color:var(--paper);
    border:2px solid var(--cyan);box-shadow:4px 4px 0 rgba(122,59,255,.9);
  }
  .nav-toggle__bars{display:block;position:relative;width:22px;height:2px;background:var(--cyan);box-shadow:0 -7px 0 var(--cyan), 0 7px 0 var(--cyan);transition:background-color .18s var(--ease),box-shadow .18s var(--ease)}
  .nav-toggle__label{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.16em;color:rgba(245,239,226,.72)}
  .nav-toggle[aria-expanded="true"]{border-color:var(--gold);box-shadow:4px 4px 0 rgba(242,183,10,.75)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;box-shadow:none}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before,
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{content:"";position:absolute;left:50%;top:50%;width:24px;height:2px;background:var(--gold)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translate(-50%,-50%) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translate(-50%,-50%) rotate(-45deg)}
}

/* ============ 11 页脚 ============ */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--ink);color:var(--paper);
  padding:clamp(48px,7vw,88px) var(--wrap-pad) 0;
  border-top:2px solid var(--ink);
}
@media (min-width:1024px){.site-footer{padding-left:calc(var(--rail-w) + var(--wrap-pad))}}
.footer__inner{display:grid;gap:36px 28px;grid-template-columns:minmax(0,1fr);max-width:var(--wrap)}
@media (min-width:640px){.footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.footer__inner{grid-template-columns:1.6fr 1fr 1fr 1fr 1.3fr}}
.footer__brand{max-width:34em}
.footer__tagline{margin-top:16px;font-size:.98rem;color:rgba(245,239,226,.76)}
.footer__stamp{margin-top:14px;color:var(--gold);font-size:.68rem;letter-spacing:.14em}
.footer__title{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-family:var(--font-mono);font-size:.72rem;font-weight:400;letter-spacing:.14em;color:var(--cyan)}
.footer__title::before{content:"";width:8px;height:8px;background:var(--cyan);flex:0 0 auto}
.footer__list{display:grid;gap:10px;font-size:.94rem}
.footer__list a{color:rgba(245,239,226,.8)}
.footer__list a:hover{color:var(--gold);text-decoration:underline;text-underline-offset:3px}
.footer__list--plain{color:rgba(245,239,226,.62);font-size:.86rem;line-height:1.7}
.footer__list--plain .mono{color:var(--paper);font-size:.8rem}
.footer__grid{
  height:24px;margin-top:clamp(40px,6vw,72px);
  border-top:1px solid var(--line-invert);border-bottom:1px solid var(--line-invert);
  background-image:
    linear-gradient(90deg, rgba(245,239,226,.12) 1px, transparent 1px),
    linear-gradient(0deg, rgba(245,239,226,.12) 1px, transparent 1px);
  background-size:8px 8px;
}
.footer__bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;padding:18px 0 26px;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;color:rgba(245,239,226,.55)}

/* ============ 12 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}
  .js [data-reveal],[data-reveal]{opacity:1 !important;transform:none !important}
  .scroll-progress__bar{transition:none}
  .rail,.drawer-scrim,.topbar__inner,.brand__sub,.topbar__meta,.skip-link{transition:none}
  .btn:hover,.btn:active{transform:none}
}