/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dt,dd,address{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{max-width:100%;height:auto;display:block}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--electric-400);outline-offset:3px;border-radius:6px}

/* ============ 2. 变量 ============ */
:root{
  --ink-900:#071523;
  --navy-800:#0E2740;
  --navy-600:#1B3A5A;
  --paper-050:#F5F8F9;
  --paper-100:#E6EEF1;
  --orange-500:#FF6A1A;
  --orange-300:#FFB27A;
  --mint-400:#3FD9A8;
  --electric-400:#2CC6E0;
  --violet-500:#7C5CFF;
  --text-900:#0B1B2B;
  --text-100:#E9F2F6;
  --text-muted:#4E6779;
  --rail-w:120px;
  --sp-1:8px;
  --sp-2:16px;
  --sp-3:24px;
  --sp-4:40px;
  --sp-5:64px;
  --r-pill:999px;
  --r-lg:28px;
  --r-md:18px;
  --r-sm:12px;
  --font-body:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-card:0 18px 40px -28px rgba(7,21,35,.5);
  --shadow-bar:0 22px 44px -30px rgba(4,12,22,.95);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ============ 3. 基础排版 ============ */
body{
  margin:0;
  background:var(--paper-050);
  color:var(--text-900);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  transition:padding-left .3s var(--ease);
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.2}
p{max-width:44em}
strong{font-weight:700}
.u-mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.03em}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
#main-content{display:block;padding-top:86px}

/* ============ 4. 布局容器 ============ */
.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:var(--sp-3)}
.container--wide{max-width:1400px}
.section{padding:var(--sp-5) 0}
.section--paper{background:var(--paper-100)}
.section--navy{background:var(--navy-800);color:var(--text-100)}
.section--dark{background:var(--ink-900);color:var(--text-100)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:var(--sp-2);margin-bottom:var(--sp-4)}
.section__eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--electric-400);text-transform:uppercase;margin-bottom:6px}
.section__title{font-size:clamp(24px,3.4vw,44px);font-weight:900;letter-spacing:-.02em;line-height:1.15}
.section__lead{max-width:44em;font-size:16px;color:var(--text-muted)}
.section--dark .section__lead,.section--navy .section__lead{color:rgba(233,242,246,.74)}
.section--dark .section__eyebrow,.section--navy .section__eyebrow{color:var(--electric-400)}

/* ============ 5. 网格 ============ */
.grid{display:grid;gap:var(--sp-3)}
.grid--2,.grid--3,.grid--4,.grid--split{grid-template-columns:1fr}
@media (min-width:720px){
  .grid{gap:var(--sp-4)}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}
}

/* ============ 6. 时间线 ============ */
.timeline{border-top:1px solid rgba(11,27,43,.12)}
.section--dark .timeline,.section--navy .timeline{border-top-color:var(--navy-600)}
.timeline__row{display:grid;grid-template-columns:1fr;gap:6px;padding:var(--sp-2) 0;border-bottom:1px solid rgba(11,27,43,.12)}
.section--dark .timeline__row,.section--navy .timeline__row{border-bottom-color:var(--navy-600)}
.timeline__date{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--orange-500)}
.timeline__body{display:flex;flex-direction:column;gap:6px}
.timeline__title{font-size:18px;font-weight:700;line-height:1.45;letter-spacing:-.01em}
.timeline__meta{font-family:var(--font-mono);font-size:12px;color:var(--text-muted)}
.section--dark .timeline__meta,.section--navy .timeline__meta{color:rgba(233,242,246,.6)}
@media (min-width:720px){
  .timeline__row{grid-template-columns:132px minmax(0,1fr);gap:var(--sp-3);padding:var(--sp-3) 0}
}

/* ============ 7. 卡片 ============ */
.card{
  display:flex;flex-direction:column;gap:var(--sp-2);
  padding:var(--sp-3);
  border-radius:var(--r-lg);
  background:#fff;
  border:1px solid var(--paper-100);
  transition:transform .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--orange-500);box-shadow:var(--shadow-card)}
.card__body{display:flex;flex-direction:column;gap:8px}
.card__title{font-size:19px;font-weight:900;line-height:1.35;letter-spacing:-.01em}
.card__text{font-size:15px;line-height:1.7;color:var(--text-muted)}
.card__meta{font-family:var(--font-mono);font-size:12px;color:var(--text-muted);letter-spacing:.04em}
.card__more{font-size:14px;font-weight:700;color:var(--orange-500);display:inline-flex;align-items:center;gap:6px}
.card--dark{background:var(--navy-800);border-color:var(--navy-600);color:var(--text-100)}
.card--dark .card__title{color:#fff}
.card--dark .card__text,.card--dark .card__meta{color:rgba(233,242,246,.72)}

/* ============ 8. 标签 ============ */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;
  background:var(--paper-100);color:var(--text-900);
  border:1px solid transparent;white-space:nowrap;
}
.tag--orange{background:rgba(255,106,26,.14);color:#A83D00;border-color:rgba(255,106,26,.36)}
.tag--mint{background:rgba(63,217,168,.16);color:#0C6B4F;border-color:rgba(63,217,168,.42)}
.tag--electric{background:rgba(44,198,224,.16);color:#0A6072;border-color:rgba(44,198,224,.42)}
.tag--violet{background:rgba(124,92,255,.14);color:#4A2FBF;border-color:rgba(124,92,255,.36)}
.tag--solid{background:var(--orange-500);color:#07131F;border-color:transparent;font-weight:700}

/* ============ 9. 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-pill);
  font-size:15px;font-weight:700;line-height:1;letter-spacing:.01em;
  border:1px solid transparent;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--primary{background:var(--orange-500);color:#07131F;box-shadow:0 14px 28px -18px rgba(255,106,26,.95)}
.btn--primary:hover{background:var(--orange-300);transform:translateY(-2px)}
.btn--ghost{border-color:var(--navy-600);color:var(--text-100)}
.btn--ghost:hover{border-color:var(--orange-500);color:var(--orange-300);transform:translateY(-2px)}
.btn--quiet{background:var(--paper-100);color:var(--text-900)}
.btn--quiet:hover{background:var(--navy-800);color:var(--text-100)}
.btn--sm{padding:8px 16px;font-size:13px}

/* ============ 10. 媒体容器 ============ */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-md);
  background:linear-gradient(140deg,var(--navy-800),var(--ink-900));
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(7,21,35,0) 42%,rgba(7,21,35,.74) 100%);
}
.media img{width:100%;height:100%;object-fit:cover;transition:transform .45s var(--ease)}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.card:hover .media img,.media:hover img{transform:scale(1.02)}
.media__tag{position:absolute;left:12px;bottom:12px;z-index:1;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;padding:5px 10px;border-radius:var(--r-pill);background:rgba(7,21,35,.78);color:var(--orange-300);border:1px solid var(--navy-600)}

/* ============ 11. 正文与面包屑 ============ */
.prose{display:flex;flex-direction:column;gap:var(--sp-2);max-width:44em;font-size:17px;line-height:1.75}
.prose h2{font-size:clamp(20px,2.4vw,28px);margin-top:var(--sp-2)}
.prose h3{font-size:18px;margin-top:var(--sp-1)}
.prose a{color:var(--text-900);text-decoration:underline;text-decoration-color:var(--orange-500);text-decoration-thickness:2px;text-underline-offset:3px}
.prose a:hover{color:var(--orange-500)}
.prose ul{display:flex;flex-direction:column;gap:8px}
.prose li{position:relative;padding-left:18px}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:9px;height:2px;border-radius:2px;background:var(--orange-500)}
.breadcrumb{padding:0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;color:var(--text-muted)}
.breadcrumb-item{display:flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--navy-600);opacity:.6}
.breadcrumb-link{color:var(--text-muted);transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--orange-500)}
.breadcrumb-item[aria-current="page"]{color:var(--text-900)}

/* ============ 12. 显现动效 ============ */
[data-reveal]{transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js [data-reveal]{opacity:0;transform:translateY(14px)}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 13. 头部 ============ */
.skip-link{
  position:absolute;top:-64px;left:16px;z-index:120;
  padding:10px 18px;border-radius:var(--r-pill);
  background:var(--orange-500);color:#07131F;font-weight:700;font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:16px}

.site-header{
  position:fixed;top:16px;left:16px;right:16px;z-index:80;
  transition:top .3s var(--ease),left .3s var(--ease),right .3s var(--ease);
}
.header-shell{
  position:relative;z-index:2;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 12px;
  border-radius:var(--r-pill);
  background:linear-gradient(120deg,rgba(14,39,64,.97),rgba(7,21,35,.97));
  border:1px solid var(--navy-600);
  box-shadow:var(--shadow-bar);
  color:var(--text-100);
  transition:padding .3s var(--ease),border-radius .3s var(--ease);
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;min-width:0}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;border-radius:14px;
  background:linear-gradient(150deg,var(--orange-500),#FF8A3D);
  color:#07131F;font-size:18px;font-weight:900;line-height:1;
}
.brand-lockup{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{font-size:15px;font-weight:900;letter-spacing:-.01em;color:var(--text-100);line-height:1.2}
.brand-domain{font-family:var(--font-mono);font-size:10px;letter-spacing:.02em;color:var(--electric-400);line-height:1.2}
.nav-toggle{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 14px;border-radius:var(--r-pill);
  border:1px solid var(--navy-600);color:var(--text-100);font-size:13px;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--orange-500);color:var(--orange-300)}
.nav-toggle-icon{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.nav-toggle-icon::before,.nav-toggle-icon::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle-icon::before{top:-5px}
.nav-toggle-icon::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle-text{letter-spacing:.04em}

.site-nav{
  position:absolute;top:calc(100% + 10px);left:0;right:0;z-index:3;
  display:none;
  padding:14px;
  border-radius:26px;
  background:linear-gradient(180deg,rgba(14,39,64,.99),rgba(7,21,35,.99));
  border:1px solid var(--navy-600);
  box-shadow:0 30px 60px -34px rgba(4,12,22,1);
}
.site-nav[data-open]{display:block}
.nav-list{display:flex;flex-direction:column;gap:4px}
.nav-item{flex:0 0 auto}
.nav-link{
  display:flex;align-items:center;gap:12px;
  padding:12px 14px;border-radius:16px;
  font-size:15px;font-weight:600;color:var(--text-100);line-height:1.3;
  transition:background-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.nav-link:hover{background:rgba(27,58,90,.7);color:#fff}
.nav-index{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--orange-300);opacity:.9}
.nav-label{display:block}
.nav-link[aria-current="page"]{background:var(--orange-500);color:#07131F}
.nav-link[aria-current="page"] .nav-index{color:rgba(7,19,31,.68)}
.nav-link[aria-current="page"]:hover{background:var(--orange-300);color:#07131F}

.header-pulse{display:none;align-items:center;gap:10px;flex:0 0 auto}
@media (min-width:640px){.header-pulse{display:flex}}
.pulse-date{display:flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:12px;color:rgba(233,242,246,.78);white-space:nowrap}
.pulse-key{font-size:10px;letter-spacing:.16em;color:var(--electric-400)}
.pulse-value{color:var(--orange-300);font-weight:700}
.pulse-cta{
  display:inline-flex;align-items:center;
  padding:9px 14px;border-radius:var(--r-pill);
  background:var(--orange-500);color:#07131F;font-size:13px;font-weight:700;white-space:nowrap;
  transition:background-color .2s var(--ease),transform .2s var(--ease);
}
.pulse-cta:hover{background:var(--orange-300);transform:translateY(-2px)}

.rail-progress{
  position:absolute;left:30px;right:30px;bottom:-7px;height:2px;
  border-radius:2px;background:rgba(44,198,224,.2);overflow:hidden;
}
.rail-progress-bar{
  display:block;width:var(--scroll-progress,0%);height:100%;
  background:linear-gradient(90deg,var(--electric-400),var(--orange-500));
  transition:width .12s linear;
}

@media (max-width:1079px){
  html[data-scrolled="true"] .site-header{top:10px;left:10px;right:10px}
  html[data-scrolled="true"] .header-shell{padding:8px 10px}
}

/* 桌面：品牌轨道 */
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  html{scroll-padding-top:24px}
  #main-content{padding-top:0}
  .site-header{top:0;left:0;right:auto;bottom:0;width:var(--rail-w)}
  .header-shell{
    flex-direction:column;align-items:stretch;justify-content:space-between;
    height:100%;padding:24px 12px 20px;
    border-radius:0 var(--r-lg) var(--r-lg) 0;
    border-left:0;
    background:linear-gradient(180deg,var(--ink-900) 0%,var(--navy-800) 48%,var(--ink-900) 100%);
    box-shadow:18px 0 46px -40px rgba(4,12,22,1);
  }
  .brand{flex-direction:column;align-items:center;gap:8px;text-align:center}
  .brand-lockup{align-items:center;gap:3px}
  .brand-name{font-size:14px}
  .brand-domain{font-size:9px;line-height:1.3;word-break:break-all;max-width:94px;text-align:center}
  .nav-toggle{display:none}
  .site-nav{
    position:static;display:block;flex:1 1 auto;min-height:0;
    margin:var(--sp-2) 0;padding:0;
    background:none;border:0;box-shadow:none;
    overflow-y:auto;overflow-x:hidden;
  }
  .site-nav[data-open]{display:block}
  .nav-list{gap:2px}
  .nav-item{width:100%}
  .nav-link{flex-direction:column;align-items:center;gap:2px;padding:10px 6px;font-size:13px;border-radius:14px;text-align:center}
  .nav-index{font-size:9px;letter-spacing:.12em;opacity:.6}
  .nav-label{white-space:normal}
  .nav-link:hover{background:rgba(27,58,90,.72)}
  .nav-link[aria-current="page"]{
    background:linear-gradient(90deg,rgba(255,106,26,.26),rgba(255,106,26,0));
    color:var(--orange-300);
    box-shadow:inset 3px 0 0 var(--orange-500);
  }
  .header-pulse{display:flex;flex-direction:column;align-items:center;gap:8px;margin-top:var(--sp-1);text-align:center}
  .pulse-date{flex-direction:column;gap:2px;font-size:11px}
  .pulse-cta{width:100%;justify-content:center;white-space:normal;text-align:center;font-size:11px;line-height:1.35;padding:9px 10px}
  .rail-progress{left:auto;right:0;top:12%;bottom:12%;width:2px;height:auto;border-radius:2px 0 0 2px}
  .rail-progress-bar{width:100%;height:var(--scroll-progress,0%);background:linear-gradient(180deg,var(--electric-400),var(--orange-500));transition:height .12s linear}
}

/* ============ 14. 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:var(--sp-5);
  padding:var(--sp-5) 0 var(--sp-3);
  background:linear-gradient(180deg,var(--ink-900) 0%,#040D16 100%);
  color:var(--text-100);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--orange-500),var(--electric-400) 55%,var(--violet-500));
}
.footer-grid{
  width:100%;max-width:1200px;margin-inline:auto;padding-inline:var(--sp-3);
  display:grid;grid-template-columns:1fr;gap:var(--sp-4);
}
@media (min-width:720px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));padding-inline:var(--sp-4)}
  .footer-brand{grid-column:span 2}
}
@media (min-width:1080px){
  .footer-grid{grid-template-columns:1.4fr repeat(3,minmax(0,1fr)) 1.5fr;gap:var(--sp-4)}
  .footer-brand{grid-column:auto}
}
.footer-brand{display:flex;flex-direction:column;gap:10px}
.footer-logo{font-size:22px;font-weight:900;letter-spacing:-.02em;color:#fff}
.footer-line{font-size:15px;color:var(--orange-300);max-width:20em}
.footer-domain{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:rgba(233,242,246,.52)}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-title{font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--electric-400)}
.footer-list{display:flex;flex-direction:column;gap:8px}
.footer-link{display:inline-block;font-size:14px;color:rgba(233,242,246,.78);transition:color .2s var(--ease),transform .2s var(--ease)}
.footer-link:hover{color:var(--orange-300);transform:translateX(3px)}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-style:normal}
.contact-row{display:flex;flex-direction:column;gap:2px}
.contact-key{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:rgba(233,242,246,.48)}
.contact-value{font-size:14px;color:var(--text-100);word-break:break-all;line-height:1.5}
.contact-note{font-size:12px;line-height:1.65;color:rgba(233,242,246,.55);max-width:30em}
.footer-base{
  width:100%;max-width:1200px;margin:var(--sp-4) auto 0;
  padding:var(--sp-2) var(--sp-3) 0;
  border-top:1px solid var(--navy-600);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:rgba(233,242,246,.58);
}
@media (min-width:1080px){.footer-base{padding-inline:var(--sp-4)}}
.footer-legal{margin:0}
.footer-meta{margin:0}
.footer-copy{margin:0}

/* ============ 15. 无障碍动效 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
}