/* ============ 1. 变量 ============ */
:root{
  --lake:#0F6E8C;
  --lake-deep:#0A4356;
  --lake-mist:#CFE7EE;
  --dawn:#F7F3EA;
  --ember:#E04E2B;
  --ember-soft:#FBE0D6;
  --ember-ink:#A8331A;
  --rape:#F2B705;
  --rape-soft:#FBEFCB;
  --sand:#D9A441;
  --rock:#4B545A;
  --moss:#6E7F58;
  --ink:#14232B;
  --radius-lg:28px;
  --radius-md:20px;
  --radius-sm:14px;
  --radius-pill:999px;
  --container:1200px;
  --gutter:clamp(20px,5vw,56px);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"Roboto Mono","JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;
}

/* ============ 2. reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse}
[hidden]{display:none !important}

/* ============ 3. 中文排版 ============ */
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--rock);
  background:var(--dawn);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{color:var(--ink);font-weight:800;letter-spacing:-.02em;line-height:1.24}
h1{font-size:clamp(34px,5.2vw,64px);font-weight:900}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(20px,2vw,24px)}
h4{font-size:18px}
strong{font-weight:700;color:var(--ink)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.eyebrow{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.28em;color:var(--lake)}
.vertical-note{
  writing-mode:vertical-rl;
  font-size:12px;letter-spacing:.3em;font-weight:600;color:var(--sand);
}
.prose{max-width:34em}
.prose p + p{margin-top:1em}
.prose--tight{max-width:24em}
:focus-visible{outline:3px solid var(--lake);outline-offset:2px;border-radius:6px}
.section--deep :focus-visible,.site-footer :focus-visible{outline-color:var(--rape)}
#main-content{scroll-margin-top:96px}

/* ============ 4. 容器与分区 ============ */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:760px}
.container--wide{max-width:1360px}
.section{padding-block:clamp(48px,7vw,96px)}
.section--mist{background:var(--lake-mist)}
.section--lake{background:var(--lake);color:#EAF4F7}
.section--lake h1,.section--lake h2,.section--lake h3,.section--lake h4{color:#fff}
.section--deep{background:var(--lake-deep);color:#DCEBF0}
.section--deep h1,.section--deep h2,.section--deep h3,.section--deep h4{color:#fff}
.section--sand{background:var(--rape-soft)}
.section--mist .eyebrow,.section--lake .eyebrow,.section--deep .eyebrow{color:var(--rape)}

/* ============ 5. 网格 ============ */
.grid{display:grid;gap:clamp(20px,3vw,32px)}
.grid--split{grid-template-columns:7fr 5fr}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ============ 6. 按钮与胶囊 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 24px;border-radius:var(--radius-pill);
  font-size:16px;font-weight:700;line-height:1.3;
  border:1px solid transparent;
  transition:background-color .16s ease,border-color .16s ease,transform .16s ease,color .16s ease;
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--ember);color:#fff;font-size:18px}
.btn--primary:hover{background:#C63F1E}
.btn--lake{background:var(--lake);color:#fff}
.btn--lake:hover{background:var(--lake-deep)}
.btn--sun{background:var(--rape);color:var(--ink)}
.btn--sun:hover{background:#DDA500}
.btn--ghost{border-color:rgba(20,35,43,.28);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);background:rgba(20,35,43,.06)}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--radius-pill);
  font-size:13px;font-weight:600;letter-spacing:.02em;
  background:var(--lake-mist);color:var(--lake-deep);
}
.chip--sun{background:var(--rape);color:var(--ink)}
.chip--moss{background:rgba(110,127,88,.18);color:#46543A}
.chip--ember{background:var(--ember-soft);color:var(--ember-ink)}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:var(--radius-pill);
  border:1px solid var(--ember);color:var(--ember-ink);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;
}

/* ============ 7. 卡片 / 图片 / 时间轴 / 数据条 ============ */
.card{
  background:#fff;border:1px solid rgba(15,110,140,.14);
  border-radius:var(--radius-lg);padding:clamp(20px,3vw,32px);
}
.card--mist{background:var(--lake-mist);border-color:transparent}
.card--lake{background:var(--lake);border-color:transparent;color:#EAF4F7}
.card--lake h3,.card--lake h4{color:#fff}
.card--deep{background:var(--lake-deep);border-color:transparent;color:#DCEBF0}
.card--deep h3,.card--deep h4{color:#fff}

.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius-lg);
  background:var(--lake-mist);aspect-ratio:16/9;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame__layer{
  position:absolute;inset:auto 0 0 0;
  background:rgba(10,67,86,.74);color:#fff;
  padding:14px 20px;font-size:14px;line-height:1.6;
}

.timeline{
  display:flex;gap:clamp(16px,3vw,40px);
  overflow-x:auto;padding:26px 0 20px;
  border-top:2px solid var(--lake-mist);
  scrollbar-width:thin;
}
.section--deep .timeline,.section--lake .timeline{border-top-color:rgba(255,255,255,.24)}
.timeline-item{flex:0 0 auto;min-width:112px}
.timeline-year{display:block;font-family:var(--font-mono);font-size:24px;font-weight:600;color:var(--ink);letter-spacing:.04em}
.section--deep .timeline-year,.section--lake .timeline-year{color:#fff}
.timeline-dot{
  display:block;width:12px;height:12px;margin:14px 0;border-radius:var(--radius-pill);
  background:var(--lake-mist);transition:background-color .24s ease,transform .24s ease;
}
.timeline-item.is-lit .timeline-dot{background:var(--sand)}
.timeline-item .timeline-label{font-size:14px;color:var(--rock)}

.stat-strip{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;background:rgba(15,110,140,.2);
  border-radius:var(--radius-lg);overflow:hidden;
}
.stat{background:var(--dawn);padding:22px clamp(16px,2vw,26px)}
.stat-value{display:block;font-family:var(--font-mono);font-size:34px;font-weight:600;color:var(--lake);letter-spacing:.02em}
.stat-label{font-size:13px;color:var(--rock)}

/* ============ 8. 筛选 ============ */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:14px;border-radius:var(--radius-lg);background:var(--lake-mist);
}
.filter-pill{
  padding:9px 18px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:600;color:var(--lake-deep);
  border:1px solid rgba(15,110,140,.32);background:transparent;
  transition:background-color .16s ease,border-color .16s ease,color .16s ease,transform .16s ease;
}
.filter-pill:hover{background:rgba(255,255,255,.75)}
.filter-pill:active{transform:translateY(1px)}
.filter-pill[aria-pressed="true"]{background:var(--lake);border-color:var(--lake);color:#fff}
.filter-count{font-family:var(--font-mono);font-size:14px;color:var(--lake-deep);margin-left:auto;padding-right:6px}

/* ============ 9. 面包屑 ============ */
.breadcrumb{padding-block:18px;font-size:14px}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li + li::before{content:"/";color:rgba(75,84,90,.45);margin-right:8px}
.breadcrumb a{color:var(--lake);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.breadcrumb [aria-current="page"]{color:var(--rock)}

/* ============ 10. 显现 / 进度 ============ */
[data-reveal]{transition:opacity .12s ease,transform .12s ease}
html.js-ready [data-reveal]{opacity:0;transform:translateY(8px)}
html.js-ready [data-reveal].is-visible{opacity:1;transform:none}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  background:var(--lake);transform:scaleX(0);transform-origin:0 50%;
}

/* ============ 11. 页头 ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--dawn);
  border-bottom:1px solid rgba(15,110,140,.16);
}
.header-rail{display:flex;height:4px}
.rail-seg{display:block;height:100%}
.rail-seg--blue{flex:0 0 62%;background:var(--lake)}
.rail-seg--yellow{flex:0 0 21%;background:var(--rape)}
.rail-seg--orange{flex:0 0 17%;background:var(--ember)}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(20px,6vw,110px);
  min-height:86px;padding-block:12px;
}
.skip-link{
  position:absolute;left:16px;top:-70px;z-index:80;
  background:var(--ink);color:#fff;
  padding:10px 18px;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  font-size:15px;font-weight:700;
  transition:top .16s ease;
}
.skip-link:focus{top:0}

.brand-block{display:flex;flex-direction:column;gap:4px;flex:0 0 auto}
.brand-link{display:inline-flex;align-items:center;gap:10px}
.brand-name{font-size:24px;font-weight:900;letter-spacing:-.02em;color:var(--ink);line-height:1.15}
.brand-mark{
  font-size:12px;font-weight:700;letter-spacing:.1em;
  color:var(--lake-deep);background:var(--lake-mist);
  padding:3px 9px;border-radius:var(--radius-pill);
}
.brand-note{font-size:12px;letter-spacing:.14em;color:var(--rock)}
.brand-note .num{font-size:13px;color:var(--lake)}

.site-nav{display:flex;align-items:center;gap:clamp(14px,1.8vw,24px)}
.nav-list{display:flex;align-items:center;gap:6px}
.nav-item{display:flex}
.nav-link{
  display:inline-flex;align-items:center;
  padding:9px 16px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:600;color:var(--ink);
  border:1px solid transparent;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease;
}
.nav-link:hover{background:var(--lake-mist)}
.nav-link:active{transform:translateY(1px)}
.nav-link[aria-current="page"]{background:var(--lake);color:#fff}
.nav-link--accent{border-color:rgba(224,78,43,.6);color:var(--ink);font-weight:700}
.nav-link--accent:hover{background:var(--ember-soft);border-color:var(--ember)}
.nav-link--accent[aria-current="page"]{
  background:var(--ember-soft);border-color:var(--ember);border-width:2px;color:var(--ember-ink);
}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 20px;border-radius:var(--radius-pill);
  background:var(--lake);color:#fff;
  font-size:15px;font-weight:700;white-space:nowrap;
  transition:background-color .16s ease,transform .16s ease;
}
.nav-cta:hover{background:var(--lake-deep)}
.nav-cta:active{transform:translateY(1px)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 16px;border-radius:var(--radius-pill);
  border:1px solid rgba(20,35,43,.2);
  font-size:15px;font-weight:700;color:var(--ink);
}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:20px}
.nav-toggle-bar{height:2px;width:100%;background:var(--ink);border-radius:2px;transition:transform .16s ease}
.site-header[data-open] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}

/* ============ 12. 页脚 ============ */
.site-footer{background:var(--lake-deep);color:#CFE7EE}
.footer-metrics{background:rgba(255,255,255,.05);border-bottom:1px solid rgba(207,231,238,.2)}
.metric-list{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(16px,3vw,32px);padding-block:clamp(20px,3vw,30px);
}
.metric{display:flex;flex-direction:column;gap:2px}
.metric-value{font-size:clamp(24px,2.6vw,34px);font-weight:600;color:var(--rape);line-height:1.2}
.metric-label{font-size:13px;letter-spacing:.06em;color:#A9C6D0}

.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1.3fr;
  gap:clamp(28px,4vw,56px);
  padding-block:clamp(40px,6vw,64px);
}
.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-brand{font-size:24px;font-weight:900;letter-spacing:-.02em;color:#fff;line-height:1.2}
.footer-line{font-size:15px;line-height:1.7;color:#CFE7EE;max-width:22em}
.footer-region{font-size:13px;letter-spacing:.08em;color:var(--sand)}
.footer-title{font-size:13px;font-weight:800;letter-spacing:.22em;color:var(--rape)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{
  font-size:15px;color:#CFE7EE;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer-links a:hover{color:var(--rape);border-bottom-color:var(--rape)}
.footer-links--plain a{font-size:14px;color:#A9C6D0}
.footer-contact{font-size:15px;color:#EDF6F9;word-break:break-all}
.footer-note{font-size:13px;line-height:1.7;color:#A9C6D0;max-width:26em}
.footer-legal{background:var(--lake-mist);color:var(--ink)}
.footer-legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 24px;
  padding-block:16px;font-size:14px;
}
.legal-item{font-size:14px;color:var(--ink)}
.legal-item--region{color:var(--lake-deep);font-weight:600}
.float-feedback{
  display:none;position:fixed;right:18px;bottom:18px;z-index:60;
  padding:14px 22px;border-radius:var(--radius-pill);
  background:var(--ember);color:#fff;
  font-size:18px;font-weight:800;letter-spacing:.04em;
  box-shadow:0 12px 26px -14px rgba(10,67,86,.7);
}

/* ============ 13. 响应式 ============ */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;
    gap:16px;padding:20px var(--gutter) 28px;
    background:var(--dawn);
    border-bottom:1px solid rgba(15,110,140,.2);
    box-shadow:0 20px 32px -24px rgba(10,67,86,.55);
  }
  .site-header[data-open] .site-nav{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:8px}
  .nav-link{padding:13px 18px;font-size:17px;border-radius:var(--radius-sm)}
  .nav-link--accent{border-color:var(--ember)}
  .nav-cta{padding:15px 22px;font-size:17px}
}
@media (max-width:900px){
  .grid--split,.grid--halves,.grid--thirds{grid-template-columns:minmax(0,1fr)}
  .stat-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .metric-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{font-size:16px}
  .header-inner{min-height:74px;gap:14px}
  .brand-name{font-size:21px}
  .brand-note{letter-spacing:.08em}
  .float-feedback{display:inline-flex}
  .footer-legal-inner{padding-bottom:84px}
  .stat{background:var(--dawn)}
}
@media (max-width:480px){
  .stat-strip,.metric-list{grid-template-columns:minmax(0,1fr)}
}

/* ============ 14. 动效降级 ============ */
@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-ready [data-reveal]{opacity:1;transform:none}
  .timeline-dot{transition:none}
}