/* ============================================================
   乐橙品牌站 · 共享样式 /assets/site.css
   文件顺序：重置 → 变量 → 中文排版 → 通用组件 → 头尾 → 响应式
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg{max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
hr{border:0}
#main-content{display:block}

/* ---------- 2. 变量 ---------- */
:root{
  --c-orange:#FF6A1A;
  --c-orange-deep:#C2410C;
  --c-orange-soft:#FFE3D1;
  --c-orange-light:#FF8A47;
  --c-navy:#0B2545;
  --c-navy-2:#123456;
  --c-ink:#101826;
  --c-mint:#2DD4A8;
  --c-mint-deep:#0F7A5F;
  --c-sky:#2F6FED;
  --c-slate:#5B6B7F;
  --c-paper:#FFF9F2;
  --c-white:#FFFFFF;
  --c-glass:rgba(255,255,255,.62);
  --c-line:rgba(11,37,69,.12);
  --c-line-strong:rgba(11,37,69,.24);

  --r-sm:10px;
  --r-md:14px;
  --r-lg:20px;

  --shadow:0 22px 48px -34px rgba(11,37,69,.55);
  --shadow-soft:0 18px 40px -30px rgba(11,37,69,.45);

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"DIN Alternate","Roboto Condensed",ui-monospace,"Courier New",monospace;

  --container:1280px;
  --gutter:clamp(16px,4vw,40px);
  --header-h:68px;
  --ease:cubic-bezier(.2,.72,.28,1);
}

/* ---------- 3. 基础中文排版 ---------- */
body{
  background:var(--c-paper);
  color:var(--c-ink);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:0;
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4{color:var(--c-navy);line-height:1.05;letter-spacing:-.02em;font-weight:800}
p{max-width:72ch}

:focus-visible{
  outline:3px solid var(--c-sky);
  outline-offset:3px;
  border-radius:4px;
}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--c-navy);color:#fff;
  font-size:14px;font-weight:700;text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 4. 布局与文字组件 ---------- */
.container{
  width:100%;max-width:var(--container);
  margin:0 auto;padding:0 var(--gutter);
}
.section{padding:clamp(56px,8vw,96px) 0}
.section--tight{padding:clamp(36px,5vw,60px) 0}
.rule{height:1px;background:var(--c-line)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-num);font-size:12px;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;color:var(--c-orange-deep);
}
.eyebrow::before{content:"";width:22px;height:2px;border-radius:2px;background:var(--c-orange)}

.title-xl,.title-lg,.title-md{margin:0;color:var(--c-navy)}
.title-xl{font-size:clamp(40px,7vw,80px);font-weight:900;line-height:1.02;letter-spacing:-.03em}
.title-lg{font-size:clamp(30px,4.4vw,48px);font-weight:800;line-height:1.06;letter-spacing:-.02em}
.title-md{font-size:clamp(22px,2.6vw,32px);font-weight:800;line-height:1.15;letter-spacing:-.01em}
.lede{
  font-size:clamp(16px,1.6vw,18px);line-height:1.8;
  color:var(--c-slate);max-width:38em;margin:0;
}
.prose{max-width:68ch;color:var(--c-ink)}
.prose p{margin:0 0 1.1em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.9em 0 .6em;color:var(--c-navy)}
.prose ul,.prose ol{padding-left:1.4em;margin:0 0 1.1em}
.prose li{margin:.3em 0}
.prose a{
  color:var(--c-orange-deep);text-decoration:underline;
  text-decoration-thickness:2px;text-underline-offset:3px;
  text-decoration-color:rgba(255,106,26,.45);
}
.prose a:hover{text-decoration-color:var(--c-orange)}
.hl{
  color:var(--c-orange-deep);font-weight:700;
  box-shadow:inset 0 -.42em 0 rgba(255,106,26,.22);
}

/* 12 列栅格 */
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,24px);
}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ---------- 5. 卡片 / 标签 / 按钮 ---------- */
.card{
  position:relative;
  background:var(--c-white);
  border:1px solid var(--c-line);
  border-radius:var(--r-md);
  padding:clamp(18px,2.4vw,30px);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover,.card:focus-within{
  transform:translateY(-4px);
  border-color:var(--c-line-strong);
  box-shadow:var(--shadow);
}
.card--glass{
  background:var(--c-glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-color:rgba(255,255,255,.72);
}
.card--tint{
  background:var(--c-orange-soft);
  border-color:rgba(255,106,26,.28);
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;
  font-size:12px;font-weight:700;letter-spacing:.04em;
  background:var(--c-orange-soft);color:var(--c-orange-deep);
  border:1px solid rgba(255,106,26,.24);
}
.tag--mint{
  background:rgba(45,212,168,.16);color:var(--c-mint-deep);
  border-color:rgba(45,212,168,.42);
}
.tag--navy{
  background:rgba(11,37,69,.07);color:var(--c-navy);
  border-color:var(--c-line);
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:999px;border:1px solid transparent;
  font-family:inherit;font-size:14px;font-weight:700;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:transform .18s var(--ease),background .18s var(--ease),
             color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn--sm{padding:8px 14px;font-size:13px}
.btn--primary{
  background:var(--c-orange);color:#fff;
  box-shadow:0 12px 24px -16px rgba(255,106,26,.95);
}
.btn--primary:hover{background:var(--c-orange-deep);transform:translateY(-1px)}
.btn--ghost{
  background:rgba(255,255,255,.72);color:var(--c-navy);
  border-color:var(--c-line-strong);
}
.btn--ghost:hover{border-color:var(--c-orange);color:var(--c-orange-deep);background:#fff}
.btn--dark{background:var(--c-navy);color:#fff}
.btn--dark:hover{background:var(--c-navy-2);transform:translateY(-1px)}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{padding:18px 0 0;font-size:13px;color:var(--c-slate)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__list li:not(:first-child)::before{
  content:"/";color:rgba(11,37,69,.28);font-weight:400;
}
.breadcrumb a{
  color:var(--c-slate);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.breadcrumb a:hover{color:var(--c-orange-deep);border-color:currentColor}
.breadcrumb [aria-current="page"]{color:var(--c-navy);font-weight:700}

/* ---------- 7. 图片容器（页面阶段复用） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-md);
  border:1px solid var(--c-line);
  background:
    radial-gradient(120% 120% at 12% 6%,rgba(255,106,26,.14),transparent 55%),
    radial-gradient(100% 100% at 92% 96%,rgba(45,212,168,.16),transparent 60%),
    linear-gradient(140deg,#FFEADD,#FFF7EF 52%,#EAF6F2);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media img,.media svg,.media video{display:block;width:100%;height:100%;object-fit:cover}
.media__ph{
  position:absolute;inset:10px;
  display:grid;place-items:center;padding:10px;text-align:center;
  border:1px dashed rgba(11,37,69,.26);border-radius:calc(var(--r-md) - 6px);
  color:var(--c-slate);font-size:12px;font-weight:700;letter-spacing:.14em;
}

/* ---------- 8. 显现动效协议 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   9. 页头
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,249,242,.96);
  border-bottom:1px solid var(--c-line);
  color:var(--c-navy);
}
.header-inner{
  display:flex;align-items:center;
  gap:clamp(12px,2vw,28px);
  width:100%;max-width:var(--container);
  min-height:var(--header-h);
  margin:0 auto;padding:10px var(--gutter);
}
.brand-block{display:flex;align-items:center;gap:18px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto}
.brand-mark{
  display:grid;place-items:center;width:36px;height:36px;border-radius:11px;
  background:linear-gradient(150deg,var(--c-orange-light),var(--c-orange) 58%,#E8540A);
  color:#fff;font-size:16px;font-weight:900;line-height:1;
  box-shadow:0 10px 20px -12px rgba(255,106,26,.95);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:16px;font-weight:800;letter-spacing:-.01em;color:var(--c-navy);white-space:nowrap}
.brand-tagline{font-size:11px;font-weight:500;letter-spacing:.14em;color:var(--c-slate);white-space:nowrap}

.chapter-readout{
  display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;
  padding:4px 12px 4px 5px;border-radius:999px;
  border:1px solid var(--c-line);
  background:rgba(255,255,255,.72);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  font-size:12px;color:var(--c-slate);white-space:nowrap;
}
.chapter-readout__index{
  display:inline-block;padding:2px 7px;border-radius:999px;
  background:var(--c-orange);color:#fff;
  font-family:var(--font-num);font-size:11px;font-weight:700;letter-spacing:.06em;
}
.chapter-readout__name{font-weight:700;color:var(--c-navy);letter-spacing:.02em}

.site-nav{display:flex;align-items:center;gap:clamp(6px,1.4vw,18px);margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;margin:0;padding:0}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:5px;
  padding:8px 10px;border-radius:var(--r-sm);
  color:var(--c-navy);font-size:14px;font-weight:600;text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-link:hover{background:var(--c-orange-soft);color:var(--c-orange-deep)}
.nav-index{
  font-family:var(--font-num);font-size:10px;font-weight:700;
  letter-spacing:.06em;color:var(--c-slate);transition:color .18s var(--ease);
}
.nav-link__label{font-weight:600}
.nav-link[aria-current="page"]{background:var(--c-orange-soft);color:var(--c-orange-deep)}
.nav-link[aria-current="page"] .nav-index{color:var(--c-orange-deep)}
.nav-link[aria-current="page"] .nav-link__label{font-weight:800}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;
  height:2px;border-radius:2px;background:var(--c-orange);
}
.nav-actions{
  display:flex;align-items:center;gap:8px;
  margin-left:2px;padding-left:clamp(6px,1.2vw,18px);
  border-left:1px solid var(--c-line);
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 14px;border-radius:999px;
  border:1px solid var(--c-line-strong);
  background:#fff;color:var(--c-navy);
  font-size:13px;font-weight:700;cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-orange);color:var(--c-orange-deep)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle__label{letter-spacing:.06em}

.progress-rail{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  background:rgba(11,37,69,.07);overflow:hidden;
}
.progress-rail__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--c-orange),var(--c-orange-light));
  transition:width .12s linear;
}

/* 移动端底部快捷坞 */
.quick-dock{display:none;position:fixed;left:12px;right:12px;bottom:12px;z-index:75}
.quick-dock__list{
  display:flex;gap:2px;margin:0;padding:7px;border-radius:18px;
  background:rgba(11,37,69,.95);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  box-shadow:0 22px 44px -26px rgba(11,37,69,.9);
  border:1px solid rgba(255,255,255,.1);
}
.quick-dock__list li{flex:1 1 0;min-width:0}
.quick-dock__link{
  display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:8px 2px;border-radius:12px;text-decoration:none;
  color:rgba(255,255,255,.76);font-size:11px;font-weight:700;letter-spacing:.02em;
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.quick-dock__link:hover{color:#fff;background:rgba(255,255,255,.1)}
.quick-dock__dot{
  width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.55;
  transition:background .18s var(--ease),box-shadow .18s var(--ease),opacity .18s var(--ease);
}
.quick-dock__link[aria-current="page"]{color:#fff;background:rgba(255,106,26,.24)}
.quick-dock__link[aria-current="page"] .quick-dock__dot{
  background:var(--c-orange);opacity:1;
  box-shadow:0 0 0 3px rgba(255,106,26,.28);
}

/* ============================================================
   10. 页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--c-navy);
  color:rgba(255,255,255,.78);
  padding:clamp(44px,6vw,72px) 0 0;
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:4px;
  background:linear-gradient(90deg,var(--c-orange) 0 18%,rgba(255,106,26,0) 18%),
             linear-gradient(90deg,rgba(255,255,255,.14),rgba(255,255,255,.02));
}
.footer-inner{
  width:100%;max-width:var(--container);
  margin:0 auto;padding:0 var(--gutter);
}
.footer-lead{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px 32px;padding-bottom:28px;
  border-bottom:1px solid rgba(255,255,255,.14);
}
.footer-brand__name{
  margin:0;color:#fff;font-size:clamp(28px,4vw,44px);font-weight:900;
  line-height:1.05;letter-spacing:-.03em;
}
.footer-brand__tag{
  margin:10px 0 0;font-size:12px;font-weight:600;letter-spacing:.18em;
  color:rgba(255,255,255,.55);
}
.footer-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);padding:clamp(26px,3.4vw,42px) 0;
}
.footer-col{min-width:0}
.footer-title{
  margin:0 0 14px;color:var(--c-orange);
  font-size:12px;font-weight:700;letter-spacing:.16em;
  line-height:1.4;text-transform:none;
}
.footer-list{margin:0;padding:0}
.footer-list li+li{margin-top:2px}
.footer-list a{
  display:inline-block;padding:5px 0;
  color:rgba(255,255,255,.78);font-size:14px;font-weight:500;text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-list a:hover{color:#fff;border-bottom-color:var(--c-orange)}
.footer-col--contact{grid-column:span 1}
.footer-contact{font-style:normal;margin:0}
.footer-contact__row{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px;
  padding:7px 0;border-bottom:1px dashed rgba(255,255,255,.14);
}
.footer-contact__row:first-child{padding-top:0}
.footer-contact__label{
  flex:0 0 auto;font-size:11px;font-weight:700;letter-spacing:.14em;
  color:rgba(255,255,255,.48);
}
.footer-contact__value{
  color:#fff;font-size:14px;font-weight:600;letter-spacing:.01em;
  overflow-wrap:anywhere;
}
.footer-note{
  margin:14px 0 0;font-size:12px;line-height:1.7;
  color:rgba(255,255,255,.5);max-width:34em;
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 20px;padding:18px 0 26px;
  border-top:1px solid rgba(255,255,255,.14);
  font-size:12px;color:rgba(255,255,255,.55);
}
.footer-legal__line{margin:0;max-width:none}
.footer-legal__links{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0;max-width:none}
.footer-legal__links a{
  color:rgba(255,255,255,.72);text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.26);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-legal__links a:hover{color:var(--c-orange);border-bottom-color:var(--c-orange)}
.footer-legal__sep{color:rgba(255,255,255,.3)}

/* ============================================================
   11. 响应式
   ============================================================ */
@media (max-width:1180px){
  .chapter-readout{display:none}
  .nav-index{display:none}
}
@media (max-width:1024px){
  .brand-tagline{display:none}
}
@media (max-width:960px){
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:10px;
    margin-left:0;padding:16px var(--gutter) 24px;
    background:rgba(255,249,242,.985);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    border-bottom:1px solid var(--c-line-strong);
    box-shadow:0 34px 60px -44px rgba(11,37,69,.65);
    max-height:calc(100vh - 100px);overflow-y:auto;z-index:90;
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    display:flex;align-items:center;justify-content:flex-start;gap:10px;
    padding:13px 8px;border-radius:0;font-size:16px;
    border-bottom:1px solid var(--c-line);
  }
  .nav-index{display:inline-block;font-size:11px;min-width:22px}
  .nav-link[aria-current="page"]{
    background:transparent;color:var(--c-orange-deep);
    border-bottom-color:rgba(255,106,26,.4);
  }
  .nav-link[aria-current="page"]::after{left:0;right:auto;width:26px;bottom:5px;height:3px}
  .nav-actions{
    flex-wrap:wrap;gap:10px;margin-top:12px;padding-left:0;border-left:0;
  }
  .nav-actions .btn{flex:1 1 150px;padding:12px 16px;font-size:14px}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:span 2}
}
@media (max-width:900px){
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
}
@media (max-width:720px){
  .quick-dock{display:block}
  body{padding-bottom:84px}
  .footer-legal{flex-direction:column;align-items:flex-start}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-col--contact{grid-column:span 1}
  .footer-lead .btn{width:100%}
  .brand-name{font-size:15px}
}

/* ============================================================
   12. 无障碍与动效偏好
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .card:hover,.card:focus-within{transform:none}
  .btn--primary:hover,.btn--dark:hover{transform:none}
}