/* 优德看台 · 共享外壳 /assets/site.css */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
table{border-collapse:collapse;width:100%}

:root{
  --ink-900:#04211B;
  --ink-800:#0A3A2E;
  --ink-600:#125744;
  --amber-500:#FFB020;
  --amber-200:#FFE1A8;
  --signal-500:#FF6B2C;
  --cool-100:#E4EBEF;
  --cool-300:#B9C8D1;
  --paper-050:#F7F9F9;
  --text-900:#0F1F1C;
  --text-muted:#5C736D;
  --glass-dark:rgba(10,58,46,.74);
  --glass-ink:rgba(4,33,27,.92);
  --stroke-light:rgba(255,255,255,.14);
  --radius-s:12px;
  --radius-m:18px;
  --radius-l:26px;
  --shadow-soft:0 18px 44px rgba(4,33,27,.14);
  --ease:cubic-bezier(.2,.7,.2,1);
  --container:1180px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}

body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  color:var(--text-900);
  background:var(--paper-050);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{font-family:var(--font-sans);font-weight:900;letter-spacing:.04em;line-height:1.18;color:var(--text-900)}
h1{font-size:clamp(2rem,4.6vw,3.4rem);line-height:1.06;letter-spacing:.06em}
h2{font-size:clamp(1.5rem,3vw,2.2rem);line-height:1.2}
h3{font-size:clamp(1.15rem,2vw,1.5rem);line-height:1.3}
h4{font-size:1.05rem;letter-spacing:.06em}

p{margin-bottom:1.2em}
p:last-child{margin-bottom:0}

:focus-visible{outline:2px solid var(--amber-500);outline-offset:3px;border-radius:4px}
.btn--amber:focus-visible{outline-color:var(--amber-200)}

#main-content{scroll-margin-top:110px}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:50%;z-index:120;
  transform:translate(-50%,-160%);
  padding:10px 20px;border-radius:999px;
  background:var(--amber-500);color:var(--ink-900);
  font-size:14px;font-weight:800;letter-spacing:.08em;
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ---------- 头部：悬浮胶囊 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  padding:12px clamp(12px,3vw,28px) 0;
}
.site-header__inner{
  position:relative;
  display:flex;align-items:center;gap:14px;
  max-width:1240px;margin:0 auto;
  padding:9px 12px 9px 14px;
  border-radius:999px;
  background:var(--glass-dark);
  border:1px solid var(--stroke-light);
  -webkit-backdrop-filter:blur(14px) saturate(1.15);
  backdrop-filter:blur(14px) saturate(1.15);
  box-shadow:0 10px 32px rgba(4,33,27,.3);
  transition:padding .35s var(--ease),max-width .35s var(--ease),box-shadow .35s var(--ease),border-radius .35s var(--ease);
}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--paper-050);min-width:0}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;border-radius:12px;
  background:var(--amber-500);color:var(--ink-900);
  font-size:16px;font-weight:900;line-height:1;letter-spacing:0;
  box-shadow:inset 0 0 0 1px rgba(4,33,27,.18);
  transition:width .3s var(--ease),height .3s var(--ease),font-size .3s var(--ease);
}
.brand__text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand__name{font-size:16px;font-weight:900;letter-spacing:.14em;white-space:nowrap}
.brand__line{margin-top:3px;font-size:10px;font-weight:500;letter-spacing:.16em;color:rgba(247,249,249,.55);white-space:nowrap}

.primary-nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.primary-nav__list{display:flex;align-items:center;gap:2px}
.primary-nav__item{display:block}
.nav-link{
  display:inline-block;padding:8px 11px;border-radius:999px;
  font-size:14px;font-weight:500;letter-spacing:.04em;
  color:rgba(247,249,249,.78);
  transition:background .25s var(--ease),color .25s var(--ease);
}
.nav-link:hover{background:rgba(255,255,255,.1);color:var(--paper-050)}
.nav-link[aria-current="page"]{
  background:var(--amber-500);color:var(--ink-900);font-weight:800;
}
.nav-link[aria-current="page"]:hover{background:var(--amber-200)}
.primary-nav__cta{margin-left:10px;white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 14px;border-radius:999px;
  border:1px solid var(--stroke-light);
  background:rgba(255,255,255,.07);
  color:var(--paper-050);cursor:pointer;
  transition:background .25s var(--ease);
}
.nav-toggle:hover{background:rgba(255,255,255,.14)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:currentColor;transition:background .25s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .25s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{font-size:13px;font-weight:700;letter-spacing:.12em}

@media (min-width:901px){
  .site-header.is-docked{position:fixed;top:auto;bottom:0;left:0;right:0;padding:0 16px 14px}
  .site-header.is-docked .site-header__inner{max-width:780px;padding:7px 10px 7px 12px;box-shadow:0 22px 48px rgba(4,33,27,.5)}
  .site-header.is-docked .brand__line{display:none}
  .site-header.is-docked .brand__mark{width:32px;height:32px;border-radius:10px;font-size:14px}
  .site-header.is-docked .brand__name{font-size:14px}
  .site-header.is-docked .nav-link{font-size:13px;padding:6px 9px}
  .site-header.is-docked .primary-nav__cta{display:none}
  body.has-docked-nav .site-footer{padding-bottom:82px}
}

@media (max-width:900px){
  .site-header{padding:10px 12px 0}
  .site-header__inner{gap:8px;padding:8px 10px}
  .brand__line{display:none}
  .brand__name{font-size:15px}
  .primary-nav{
    position:absolute;top:calc(100% + 8px);left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:6px;
    margin-left:0;padding:14px;
    border-radius:var(--radius-l);
    background:var(--glass-ink);
    border:1px solid var(--stroke-light);
    -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
    box-shadow:0 26px 60px rgba(4,33,27,.5);
    max-height:calc(100vh - 130px);overflow:auto;
    z-index:70;
  }
  .primary-nav[data-open="true"]{display:flex}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:4px;width:100%}
  .primary-nav__item{width:100%}
  .nav-link{display:block;width:100%;padding:12px 14px;border-radius:14px;font-size:15px;background:rgba(255,255,255,.05)}
  .primary-nav__cta{margin:8px 0 0;width:100%;padding:12px 18px}
  .nav-toggle{display:inline-flex}
  body.is-nav-open{overflow:hidden}
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:auto;
  background:var(--ink-900);
  color:rgba(247,249,249,.78);
}
.footer-band{
  height:clamp(48px,7vw,92px);
  border-top:1px solid rgba(255,176,32,.5);
  background:linear-gradient(180deg,rgba(255,176,32,.3),rgba(255,176,32,0) 84%);
}
.footer__inner{
  max-width:var(--container);margin:0 auto;
  padding:clamp(26px,4vw,44px) clamp(18px,5vw,48px) clamp(20px,3vw,30px);
}
.footer__top{
  display:grid;
  grid-template-columns:1.5fr .9fr .9fr 1.35fr;
  gap:clamp(20px,3vw,40px);
}
.footer-brand__name{font-size:1.3rem;font-weight:900;letter-spacing:.16em;color:var(--paper-050)}
.footer-brand__line{margin-top:10px;font-size:14px;line-height:1.7;color:rgba(247,249,249,.6);max-width:30ch}
.footer-col__title{
  margin-bottom:14px;font-size:11px;font-weight:700;letter-spacing:.22em;
  color:var(--amber-500);
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-block;font-size:14px;letter-spacing:.03em;
  color:rgba(247,249,249,.78);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--amber-200);transform:translateX(2px)}
.footer-contact__list{display:flex;flex-direction:column;gap:10px}
.footer-contact__item{display:flex;flex-direction:column;gap:2px}
.footer-contact__label{font-size:11px;letter-spacing:.18em;color:rgba(247,249,249,.42)}
.footer-contact__value{font-size:14px;line-height:1.6;color:rgba(247,249,249,.88);word-break:break-word;font-variant-numeric:tabular-nums}
.footer-contact__note{margin-top:12px;font-size:12px;letter-spacing:.04em;color:rgba(247,249,249,.42)}
.footer__legal{
  margin-top:clamp(24px,4vw,40px);padding-top:18px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;
}
.footer__legal-text{font-size:12px;letter-spacing:.06em;color:rgba(247,249,249,.5);font-variant-numeric:tabular-nums;margin:0}

@media (max-width:900px){
  .footer__top{grid-template-columns:1fr 1fr;gap:26px 24px}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:520px){
  .footer__top{grid-template-columns:1fr}
  .footer__legal{flex-direction:column}
}

/* ---------- 容器与节奏 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:clamp(18px,5vw,48px)}
.section{padding-block:clamp(44px,7vw,92px)}
.stack{display:flex;flex-direction:column;gap:clamp(14px,2vw,22px)}
.rule{border:0;height:1px;background:var(--cool-300);opacity:.55;margin:clamp(26px,4vw,48px) 0}

.section-head{display:flex;flex-direction:column;gap:10px;margin-bottom:clamp(20px,3vw,34px)}
.section-head__title{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:900;letter-spacing:.06em;line-height:1.16}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:12px;font-weight:600;letter-spacing:.18em;color:var(--text-muted);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--amber-500);flex:0 0 auto}

.display{font-size:clamp(2.2rem,6vw,4.5rem);font-weight:900;letter-spacing:.06em;line-height:1.05}
.display--sm{font-size:clamp(1.75rem,4vw,2.75rem);line-height:1.1}
.lede{font-size:clamp(1rem,1.6vw,1.12rem);line-height:1.72;color:var(--text-muted);max-width:46ch}
.body-text{font-size:1rem;line-height:1.78}
.meta{font-size:13px;letter-spacing:.04em;color:var(--text-muted)}
.link-inline{color:var(--ink-600);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.link-inline:hover{color:var(--amber-500)}
.num{font-variant-numeric:tabular-nums;font-weight:800;color:var(--amber-500)}
.index-num{
  display:block;font-size:clamp(2.5rem,5vw,4.5rem);font-weight:900;line-height:.9;
  letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--amber-500);
}
.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}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:999px;
  font-size:14px;font-weight:700;letter-spacing:.06em;line-height:1.2;
  border:1px solid transparent;cursor:pointer;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.btn--amber{background:var(--amber-500);color:var(--ink-900)}
.btn--amber:hover{background:var(--amber-200)}
.btn--ghost{background:rgba(255,255,255,.06);border-color:rgba(247,249,249,.4);color:var(--paper-050)}
.btn--ghost:hover{background:rgba(255,255,255,.16);border-color:var(--amber-200)}
.btn--outline{background:transparent;border-color:var(--ink-800);color:var(--ink-800)}
.btn--outline:hover{background:var(--ink-800);color:var(--paper-050)}
.btn--sm{padding:7px 15px;font-size:13px;letter-spacing:.04em}

/* ---------- 标签 / 筛选 ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  background:var(--amber-200);color:var(--ink-800);
  font-size:12px;font-weight:700;letter-spacing:.06em;white-space:nowrap;
}
.tag--signal{background:var(--signal-500);color:#fff}
.tag--outline{background:transparent;border:1px solid var(--cool-300);color:var(--text-muted);font-weight:500}

.chips{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.chip{
  padding:7px 15px;border-radius:999px;
  border:1px solid var(--cool-300);background:#fff;color:var(--ink-800);
  font-size:13px;font-weight:600;letter-spacing:.04em;cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.chip:hover{border-color:var(--ink-600)}
.chip[aria-pressed="true"]{background:var(--amber-200);border-color:var(--amber-500);color:var(--ink-900)}
.chips__count{font-size:12px;letter-spacing:.12em;color:var(--text-muted);font-variant-numeric:tabular-nums}

/* ---------- 面板 / 卡片 ---------- */
.panel{
  background:#fff;border:1px solid var(--cool-100);border-radius:var(--radius-m);
  padding:clamp(20px,3vw,32px);
}
.panel--ink{background:var(--ink-800);border-color:rgba(255,255,255,.12);color:rgba(247,249,249,.82)}
.panel--glass{
  background:rgba(10,58,46,.62);
  border:1px solid var(--stroke-light);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  color:var(--paper-050);
}
.card{
  display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--cool-100);border-radius:var(--radius-m);
  padding:clamp(18px,2.4vw,26px);
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease),transform .3s var(--ease);
}
.card:hover{border-color:var(--amber-500);box-shadow:var(--shadow-soft);transform:translateY(-2px)}
.card__title{font-size:1.05rem;font-weight:800;letter-spacing:.04em;line-height:1.35;margin-bottom:6px}
.card__body{font-size:14.5px;line-height:1.72;color:var(--text-muted)}
.card__meta{margin-top:auto;padding-top:14px;font-size:12px;letter-spacing:.12em;color:var(--text-muted);font-variant-numeric:tabular-nums}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;overflow:hidden;border-radius:var(--radius-m);
  background:linear-gradient(155deg,var(--ink-800),var(--ink-600));
  aspect-ratio:16/10;
}
.media img{width:100%;height:100%;object-fit:cover;object-position:center 62%}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__caption{
  position:absolute;left:0;bottom:0;right:0;
  padding:12px 16px;
  font-size:12px;letter-spacing:.1em;color:rgba(247,249,249,.86);
  background:linear-gradient(0deg,rgba(4,33,27,.82),rgba(4,33,27,0));
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.5vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:7fr 5fr}
.grid--asym-rev{grid-template-columns:5fr 7fr}
@media (max-width:860px){
  .grid--2,.grid--3,.grid--asym,.grid--asym-rev{grid-template-columns:1fr}
}

/* ---------- 指标 ---------- */
.stat{display:flex;flex-direction:column;gap:2px}
.stat__num{font-size:clamp(1.5rem,3vw,2rem);font-weight:900;line-height:1.1;letter-spacing:-.01em;color:var(--amber-500);font-variant-numeric:tabular-nums}
.stat__label{font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--text-muted)}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);letter-spacing:.04em}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item:not(:last-child)::after{content:"/";color:var(--cool-300)}
.breadcrumb a:hover{color:var(--ink-600)}

/* ---------- 正文 / 背景分区 ---------- */
.prose{max-width:44rem}
.prose p{margin-bottom:1.2em}
.prose h2{margin:1.6em 0 .6em;font-size:clamp(1.35rem,2.4vw,1.8rem)}
.prose h3{margin:1.4em 0 .5em}
.prose ul{list-style:disc;padding-left:1.2em;margin-bottom:1.2em}
.prose li{margin-bottom:.5em}

.bg-paper{background:var(--paper-050)}
.bg-cool{background:var(--cool-100)}
.bg-ink{background:var(--ink-900);color:rgba(247,249,249,.82)}
.bg-ink h1,.bg-ink h2,.bg-ink h3,.bg-ink h4{color:var(--paper-050)}
.bg-ink .lede,.bg-ink .card__body,.bg-ink .body-text{color:rgba(247,249,249,.68)}
.bg-ink .meta,.bg-ink .stat__label,.bg-ink .eyebrow{color:rgba(247,249,249,.5)}

/* ---------- 滚动显现 ---------- */
[data-reveal]{transition:opacity .48s var(--ease),transform .48s var(--ease)}
[data-reveal].is-pending{opacity:0;transform:translateY(16px)}
[data-reveal].is-visible{opacity:1;transform:none}
[data-reveal-group] > [data-reveal]:nth-child(2){transition-delay:.07s}
[data-reveal-group] > [data-reveal]:nth-child(3){transition-delay:.14s}
[data-reveal-group] > [data-reveal]:nth-child(4){transition-delay:.21s}
[data-reveal-group] > [data-reveal]:nth-child(5){transition-delay:.28s}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal],[data-reveal].is-pending{opacity:1 !important;transform:none !important;transition:none !important}
  .card:hover{transform:none}
  .footer-link:hover{transform:none}
}