/* ============================================================
   海南中学 · 设计系统 · Components
   Nav / Buttons / Cards / Modal / Lightbox / FAQ / Footer
   ============================================================ */

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:200;
  transition:background .45s var(--e-out),box-shadow .45s var(--e-out),border-color .45s var(--e-out);
  border-bottom:1px solid transparent;
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  height:clamp(64px,7vh,84px);
}
.nav.is-scrolled{
  background:rgba(11,26,38,.72);
  -webkit-backdrop-filter:blur(22px) saturate(160%);
  backdrop-filter:blur(22px) saturate(160%);
  border-bottom-color:var(--line-dark);
  box-shadow:0 8px 34px rgba(11,26,38,.28);
}
.nav.is-light:not(.is-scrolled) .brand-name,
.nav.is-light:not(.is-scrolled) .nav-link{color:var(--deep)}
.nav.is-light:not(.is-scrolled) .brand-sub{color:rgba(12,34,51,.55)}

.brand{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{
  font-size:clamp(1.02rem,1.5vw,1.28rem);font-weight:700;letter-spacing:.06em;
  color:#fff;line-height:1.15;white-space:nowrap;
}
.brand-sub{
  font-family:var(--f-en);font-size:.56rem;letter-spacing:.28em;text-transform:uppercase;
  color:rgba(255,255,255,.55);white-space:nowrap;
}
.nav-links{display:flex;align-items:center;gap:clamp(8px,1.6vw,26px)}
.nav-link{
  position:relative;font-size:.92rem;color:#fff;padding:8px 2px;
  transition:color .3s var(--e-out),opacity .3s;opacity:.9;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:currentColor;
  transform:scaleX(0);transform-origin:left;transition:transform .4s var(--e-out);
}
.nav-link:hover,.nav-link[aria-current="page"]{opacity:1}
.nav-link:hover::after,.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 探索按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-family:var(--f-en);font-size:.82rem;letter-spacing:.09em;
  padding:13px 24px;border-radius:100px;white-space:nowrap;
  transition:transform .4s var(--e-out),background .35s,color .35s,border-color .35s,box-shadow .35s;
  will-change:transform;
}
.btn-solid{background:var(--coral);color:#fff;box-shadow:var(--sh-glow)}
.btn-solid:hover{background:var(--coral-bright);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.34);color:#fff;background:rgba(255,255,255,.04)}
.btn-ghost:hover{background:rgba(255,255,255,.13);border-color:rgba(255,255,255,.6);transform:translateY(-2px)}
.btn-dark{border:1px solid var(--line-light);color:var(--ink);background:rgba(255,255,255,.5)}
.btn-dark:hover{background:#fff;border-color:var(--ink);transform:translateY(-2px)}
.btn-lg{padding:17px 34px;font-size:.9rem}
.btn-arrow{transition:transform .4s var(--e-out)}
.btn:hover .btn-arrow{transform:translate(3px,-3px)}

/* 汉堡 */
.burger{
  display:none;width:46px;height:46px;border-radius:50%;
  border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.05);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.burger span{
  display:block;width:18px;height:1.5px;background:#fff;border-radius:2px;
  transition:transform .4s var(--e-out),opacity .3s,background .3s;
}
.nav.is-light:not(.is-scrolled) .burger{border-color:rgba(12,34,51,.25)}
.nav.is-light:not(.is-scrolled) .burger span{background:var(--deep)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- 全屏菜单 ---------- */
.menu{
  position:fixed;inset:0;z-index:190;
  background:var(--deep);color:var(--on-dark);
  display:flex;flex-direction:column;justify-content:center;
  opacity:0;visibility:hidden;transition:opacity .55s var(--e-out),visibility .55s;
  overflow:hidden;
}
.menu.is-open{opacity:1;visibility:visible}
.menu-bg{
  position:absolute;inset:-6%;z-index:0;
  background-size:cover;background-position:center;
  transform:scale(1.08);opacity:.34;
  transition:transform 1.6s var(--e-out);
}
.menu.is-open .menu-bg{transform:scale(1)}
.menu::before{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(115deg,rgba(9,26,40,.94) 0%,rgba(16,44,66,.84) 55%,rgba(44,88,120,.6) 100%);
}
.menu-inner{position:relative;z-index:2;padding-block:80px}
.menu-list{display:flex;flex-direction:column;gap:clamp(4px,1.2vh,14px)}
.menu-item{
  display:flex;align-items:baseline;gap:clamp(12px,2.4vw,40px);
  padding-block:clamp(8px,1.4vh,16px);
  border-bottom:1px solid rgba(255,255,255,.10);
  opacity:0;transform:translateY(24px);
  transition:opacity .7s var(--e-out),transform .7s var(--e-out),border-color .35s,padding-left .45s var(--e-out);
}
.menu.is-open .menu-item{opacity:1;transform:none}
.menu-item:hover{border-bottom-color:var(--coral);padding-left:14px}
.menu-item .idx{
  font-family:var(--f-en);font-size:.72rem;letter-spacing:.1em;color:var(--coral);
  min-width:34px;
}
.menu-item .cn{font-size:clamp(1.7rem,4.4vw,3.4rem);font-weight:700;letter-spacing:-.01em;line-height:1.16}
.menu-item .en{
  font-family:var(--f-en);font-size:clamp(.68rem,1vw,.9rem);letter-spacing:.22em;
  text-transform:uppercase;color:var(--on-dark-45);margin-left:auto;
}
.menu-foot{
  position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;
  margin-top:clamp(28px,5vh,64px);padding-top:24px;border-top:1px solid rgba(255,255,255,.1);
  color:var(--on-dark-45);
}

/* ---------- 卡片 ---------- */
.card{
  position:relative;border-radius:var(--r-lg);overflow:hidden;
  background:#fff;border:1px solid var(--line-light);
  transition:transform .6s var(--e-out),box-shadow .6s var(--e-out),border-color .4s;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--sh-md)}
.card-media{position:relative;overflow:hidden;background:var(--mist)}
.card-media img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 1.1s var(--e-out),filter .6s;
}
.card:hover .card-media img{transform:scale(1.055)}
.card-body{padding:clamp(18px,2vw,28px)}
.card-dark{background:rgba(255,255,255,.035);border-color:var(--line-dark);color:var(--on-dark)}
.card-dark:hover{background:rgba(255,255,255,.06)}

/* 玻璃卡 */
.card-glass{
  border-radius:var(--r-lg);
  background:linear-gradient(150deg,rgba(255,255,255,.09),rgba(255,255,255,.03));
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  border:1px solid var(--line-dark);
  color:var(--on-dark);padding:clamp(20px,2.4vw,34px);
  transition:transform .55s var(--e-out),background .45s,border-color .45s;
}
.card-glass:hover{transform:translateY(-4px);background:linear-gradient(150deg,rgba(255,255,255,.13),rgba(255,255,255,.05));border-color:rgba(255,255,255,.24)}

/* ---------- 信息卡（联系方式 / 说明条目） ----------
   【v13 修复】此前 .cbox 在 contact.html 中已被使用，但从未定义样式，
   卡片实际以裸 HTML 渲染（无描边、无内边距、无悬浮态）。此处补齐。 */
.cbox{
  position:relative;
  border-radius:var(--r-lg);
  background:#fff;
  border:1px solid var(--line-light);
  padding:clamp(22px,2.6vw,38px);
  box-shadow:var(--sh-sm);
  transition:transform .55s var(--e-out),box-shadow .55s var(--e-out),border-color .4s;
}
.cbox:hover{transform:translateY(-5px);box-shadow:var(--sh-md);border-color:rgba(11,26,38,.18)}
/* 浅色渐变底（.bg-sky）上改为半透明玻璃卡，避免纯白块过于跳脱 */
.bg-sky .cbox{
  background:var(--glass-light);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.cbox .eyebrow{margin-bottom:2px}

/* ---------- 网站地图 ----------
   【v13 修复】.smap 此前同样无样式定义，链接以裸列表呈现。 */
.smap{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:clamp(24px,3.4vw,56px);
}
.smap h4{
  font-family:var(--f-en);font-size:.72rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--on-light-45);
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--line-light);
}
.smap ul{display:flex;flex-direction:column;gap:11px}
.smap a{
  display:inline-block;font-size:.94rem;color:var(--on-light-70);
  transition:color .3s,transform .3s var(--e-out);
}
.smap a:hover{color:var(--coral);transform:translateX(4px)}

/* ---------- 数字统计 ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat-num{
  font-family:var(--f-en);font-weight:300;
  font-size:clamp(2.6rem,6.4vw,5.4rem);line-height:1;letter-spacing:-.04em;
}
.stat-label{
  font-family:var(--f-en);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--on-dark-45);
}
.stat-cn{font-size:.9rem;color:var(--on-dark-70)}

/* ---------- 模态 / 新闻详情 ---------- */
.modal{
  position:fixed;inset:0;z-index:300;display:none;
  align-items:flex-start;justify-content:center;
  padding:clamp(16px,5vh,72px) clamp(12px,4vw,48px);
}
.modal.is-open{display:flex}
.modal-scrim{
  position:absolute;inset:0;background:rgba(6,16,26,.82);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  animation:fade .4s var(--e-out);
}
.modal-panel{
  position:relative;z-index:1;width:min(920px,100%);max-height:88vh;overflow:auto;
  background:var(--paper);border-radius:var(--r-lg);box-shadow:var(--sh-lg);
  animation:modalIn .55s var(--e-out);
  -webkit-overflow-scrolling:touch;
}
.modal-close{
  position:absolute;top:16px;right:16px;z-index:3;
  width:42px;height:42px;border-radius:50%;
  background:rgba(11,26,38,.55);color:#fff;
  display:flex;align-items:center;justify-content:center;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transition:background .3s,transform .3s;
}
.modal-close:hover{background:var(--coral);transform:rotate(90deg)}
.modal-hero{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--deep)}
.modal-hero img{width:100%;height:100%;object-fit:cover}
.modal-body{padding:clamp(22px,4vw,48px)}
@keyframes modalIn{from{opacity:0;transform:translateY(28px) scale(.985)}to{opacity:1;transform:none}}
@keyframes fade{from{opacity:0}to{opacity:1}}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed;inset:0;z-index:310;display:none;
  background:rgba(6,14,22,.94);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.lightbox.is-open{display:flex;flex-direction:column}
.lb-bar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px clamp(16px,4vw,40px);color:#fff;flex-shrink:0;
}
.lb-stage{
  flex:1;display:flex;align-items:center;justify-content:center;
  padding:0 clamp(8px,3vw,40px);min-height:0;position:relative;
}
.lb-stage img{
  max-width:100%;max-height:100%;object-fit:contain;
  border-radius:var(--r-md);box-shadow:0 40px 100px rgba(0,0,0,.5);
  animation:lbIn .5s var(--e-out);
}
@keyframes lbIn{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:none}}
.lb-btn{
  width:48px;height:48px;border-radius:50%;flex-shrink:0;
  border:1px solid rgba(255,255,255,.24);color:#fff;
  display:flex;align-items:center;justify-content:center;
  transition:background .3s,border-color .3s,transform .3s;
}
.lb-btn:hover{background:rgba(255,255,255,.14);border-color:#fff;transform:scale(1.06)}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:2}
.lb-prev{left:clamp(6px,2vw,28px)}
.lb-next{right:clamp(6px,2vw,28px)}
.lb-meta{padding:16px clamp(16px,4vw,40px) 28px;color:rgba(255,255,255,.72);text-align:center;flex-shrink:0}

/* ---------- FAQ 手风琴 ---------- */
.faq{border-top:1px solid var(--line-light)}
.faq-item{border-bottom:1px solid var(--line-light)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:clamp(18px,2.4vw,26px) 0;text-align:left;
  font-size:clamp(1rem,1.4vw,1.16rem);font-weight:600;
  transition:color .3s;
}
.faq-q:hover{color:var(--coral)}
.faq-icon{
  flex-shrink:0;width:26px;height:26px;position:relative;
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;top:50%;left:50%;width:14px;height:1.5px;background:currentColor;
  transform:translate(-50%,-50%);transition:transform .4s var(--e-out);
}
.faq-icon::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) rotate(0)}
.faq-a{
  overflow:hidden;max-height:0;
  transition:max-height .5s var(--e-out),opacity .4s,padding .4s;
  opacity:0;
}
.faq-item.is-open .faq-a{max-height:600px;opacity:1;padding-bottom:clamp(18px,2.4vw,26px)}
.faq-a-inner{color:var(--on-light-70);line-height:1.9;max-width:74ch}

/* ---------- 步骤卡 ---------- */
.steps{display:grid;gap:clamp(14px,2vw,26px);grid-template-columns:repeat(4,1fr)}
.step{
  position:relative;padding:clamp(20px,2.4vw,32px);
  border-radius:var(--r-md);background:#fff;border:1px solid var(--line-light);
  transition:transform .5s var(--e-out),box-shadow .5s;
}
.step:hover{transform:translateY(-5px);box-shadow:var(--sh-md)}
.step-n{
  font-family:var(--f-en);font-size:.72rem;letter-spacing:.16em;color:var(--coral);
  display:block;margin-bottom:14px;
}
.step::after{
  content:"";position:absolute;right:-13px;top:50%;width:26px;height:1px;
  background:var(--line-light);
}
.step:last-child::after{display:none}

/* ---------- Footer ---------- */
.footer{
  position:relative;background:var(--deep);color:var(--on-dark);
  padding-block:clamp(64px,9vh,120px) 0;overflow:hidden;
}
.footer-glow{
  position:absolute;left:50%;top:-30%;width:120%;aspect-ratio:1;
  transform:translateX(-50%);pointer-events:none;
  background:radial-gradient(circle,rgba(47,110,142,.34) 0%,transparent 62%);
}
.footer-top{
  display:grid;gap:clamp(32px,5vw,72px);
  grid-template-columns:minmax(280px,1.2fr) 2fr;
  padding-bottom:clamp(48px,7vh,88px);
}
.footer-brand .t-display{font-size:clamp(2.2rem,4.6vw,4rem)}
.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,3vw,48px)}
.footer-col h4{
  font-family:var(--f-en);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--on-dark-45);margin-bottom:18px;font-weight:400;
}
.footer-col li{margin-bottom:12px}
.footer-col a{color:var(--on-dark-70);font-size:.92rem;transition:color .3s,transform .3s;display:inline-block}
.footer-col a:hover{color:#fff;transform:translateX(3px)}
.footer-bottom{
  border-top:1px solid var(--line-dark);
  padding-block:24px 28px;
  display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;
  font-size:.82rem;color:var(--on-dark-45);
}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer-links a:hover{color:#fff}
/* 创作者署名 */
.footer-credit{font-size:.8rem;color:var(--on-dark-45)}
.footer-credit a{
  color:var(--on-dark-70);border-bottom:1px solid rgba(255,255,255,.22);
  transition:color .3s,border-color .3s;
}
.footer-credit a:hover{color:var(--coral);border-color:var(--coral)}
.footer-disclaimer{
  border-top:1px solid var(--line-dark);padding-block:18px 30px;
  font-size:.75rem;line-height:1.8;color:var(--on-dark-45);
}

/* ---------- 分页/返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(14px,2.4vw,32px);bottom:clamp(14px,2.4vw,32px);z-index:150;
  width:46px;height:46px;border-radius:50%;
  background:rgba(11,26,38,.72);color:#fff;border:1px solid var(--line-dark);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .4s var(--e-out),transform .4s var(--e-out),visibility .4s,background .3s;
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--coral)}

/* ---------- 饼屑 / 页面头 ---------- */
.page-head{
  position:relative;padding-top:clamp(110px,16vh,180px);padding-bottom:clamp(40px,6vh,72px);
  background:var(--deep);color:var(--on-dark);overflow:hidden;
}
.page-head-glow{
  position:absolute;inset:auto -10% -60% 40%;aspect-ratio:1.4;pointer-events:none;
  background:radial-gradient(circle,rgba(47,110,142,.4) 0%,transparent 65%);
}
.crumb{display:flex;gap:10px;align-items:center;font-size:.8rem;color:var(--on-dark-45);margin-bottom:18px}
.crumb a:hover{color:#fff}
.crumb span[aria-hidden]{opacity:.5}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .nav-links,.nav .btn{display:none}
  .burger{display:flex}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr}
}
@media (max-width:640px){
  .footer-cols{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
  .step::after{display:none}
  .menu-item .en{display:none}
  .lb-bar{padding:12px 14px}
  .modal-panel{max-height:92vh}
}
@media (max-width:420px){
  .footer-cols{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}