:root{
  --glass-bg: rgba(255,255,255,.62);
  --glass-bg-strong: rgba(255,255,255,.78);
  --glass-border: rgba(255,255,255,.6);
  --ink:#1c2333; --ink-2:#5a6a85; --ink-3:#8b98b5;
  --brand:#3b6ef6; --brand-2:#6a3bf6;
  --ok:#12b76a; --warn:#f79009; --err:#f04438;
  --seewo:#16a58a;
  --radius:16px; --radius-s:10px;
  --shadow: 0 10px 34px rgba(28,45,90,.12);
  --nav-h: 62px; --tabbar-h: 58px;
  --grad: linear-gradient(135deg,#3b6ef6,#6a3bf6);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Segoe UI","Microsoft YaHei",sans-serif;
  color:var(--ink); background:#eef2fb; min-height:100vh;
  padding-bottom:calc(var(--tabbar-h) + 20px);
}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* ---------- 液化玻璃工具 ---------- */
.glass-nav{
  background:var(--glass-bg);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:.5px solid var(--glass-border);
  box-shadow:0 2px 20px rgba(28,45,90,.06);
}
.glass-card{
  background:var(--glass-bg-strong);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border:.5px solid var(--glass-border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

/* ---------- 顶部导航 ---------- */
.glass-nav{position:sticky;top:0;z-index:100}
.nav-inner{max-width:1100px;margin:0 auto;height:var(--nav-h);display:flex;align-items:center;gap:20px;padding:0 18px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:18px;letter-spacing:.3px}
.brand-logo{height:30px;width:auto;border-radius:8px}
.brand-name{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;gap:6px;flex:1}
.nav-link{padding:8px 14px;border-radius:10px;font-size:14px;color:var(--ink-2);transition:.2s}
.nav-link:hover{background:rgba(59,110,246,.08);color:var(--brand)}
.nav-link.on{color:var(--brand);background:rgba(59,110,246,.12);font-weight:600}
.nav-user{display:flex;align-items:center;gap:10px}
.avatar-btn .avatar{width:34px;height:34px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600}
.btn{padding:9px 18px;border-radius:12px;border:none;cursor:pointer;font-size:14px;transition:.2s;font-weight:600}
.btn-ghost{background:rgba(59,110,246,.1);color:var(--brand)}
.btn-ghost:hover{background:rgba(59,110,246,.18)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 18px rgba(59,110,246,.35)}
.btn-primary:hover{filter:brightness(1.05);transform:translateY(-1px)}
.btn-buy{background:#fff;color:var(--brand);border:1px solid var(--brand)}

.top-banner{background:var(--grad);color:#fff;text-align:center;padding:8px 14px;font-size:13px}

/* ---------- 页面切换动画 ---------- */
.page-shell{max-width:1100px;margin:0 auto;padding:22px 18px;animation:pageIn .45s cubic-bezier(.2,.7,.3,1)}
@keyframes pageIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.section{margin:20px 0}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}
.section-title{font-size:20px;font-weight:700}
.more{color:var(--brand);font-size:13px}
.count{color:var(--ink-3);font-size:13px}

/* ---------- 首页 ---------- */
.home-hero{padding:40px 34px;text-align:center;margin-top:8px}
.home-hero h1{font-size:26px;margin-bottom:10px}
.home-hero p{color:var(--ink-2);margin-bottom:22px}
.hero-search{display:flex;gap:10px;max-width:520px;margin:0 auto}
.hero-search input{flex:1;padding:13px 18px;border-radius:14px;border:1px solid rgba(59,110,246,.25);font-size:15px;outline:none;background:#fff}
.hero-search input:focus{border-color:var(--brand)}
.hero-search button{padding:13px 26px;border-radius:14px;background:var(--grad);color:#fff;border:none;font-weight:600;cursor:pointer}
.stage-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.stage-card{padding:34px 20px;text-align:center;border-radius:var(--radius);color:#fff;font-size:18px;font-weight:700;box-shadow:var(--shadow);transition:.25s}
.stage-card:hover{transform:translateY(-4px)}
.stage-card.primary{background:linear-gradient(135deg,#f59e0b,#f43f5e)}
.stage-card.junior{background:linear-gradient(135deg,#3b6ef6,#8b5cf6)}
.stage-card.senior{background:linear-gradient(135deg,#0ea5e9,#16a34a)}

/* ---------- 资源卡片 ---------- */
.resource-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.res-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 16px rgba(28,45,90,.08);cursor:pointer;transition:.25s;border:.5px solid rgba(28,45,90,.05);display:flex;flex-direction:column}
.res-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.res-thumb{height:120px;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:34px;position:relative}
.res-thumb.courseware{background:linear-gradient(135deg,#3b6ef6,#22d3ee)}
.res-thumb.lesson_plan{background:linear-gradient(135deg,#f59e0b,#f43f5e)}
.res-thumb.exam{background:linear-gradient(135deg,#8b5cf6,#ec4899)}
.res-thumb.seewo{background:linear-gradient(135deg,#16a58a,#22d3ee)}
.res-thumb.other{background:linear-gradient(135deg,#64748b,#0ea5e9)}
.res-badge{position:absolute;top:8px;left:8px;background:rgba(0,0,0,.35);color:#fff;font-size:11px;padding:3px 8px;border-radius:8px;backdrop-filter:blur(6px)}
.res-body{padding:12px 14px;display:flex;flex-direction:column;gap:8px;flex:1}
.res-title{font-size:14px;font-weight:600;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.res-meta{font-size:12px;color:var(--ink-3);display:flex;justify-content:space-between}
.res-price{margin-top:auto;display:flex;align-items:center;justify-content:space-between}
.price{color:var(--brand);font-weight:700}
.free{color:var(--ok);font-weight:600;font-size:13px}
.dl{color:var(--ink-3);font-size:12px}
.seewo-badge{background:var(--seewo);color:#fff;font-size:11px;padding:2px 8px;border-radius:8px;vertical-align:middle}

/* ---------- 筛选 ---------- */
.filter-bar{padding:16px;display:flex;flex-direction:column;gap:12px;margin-bottom:18px}
.filter-group{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.filter-group>span{font-size:13px;color:var(--ink-3);width:34px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:6px 14px;border-radius:20px;border:1px solid rgba(28,45,90,.14);background:#fff;font-size:13px;cursor:pointer;transition:.2s}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.chip.on{background:var(--grad);color:#fff;border-color:transparent}
.filter-select{padding:8px 12px;border-radius:10px;border:1px solid rgba(28,45,90,.14);font-size:13px}
.filter-search{flex:1;padding:10px 14px;border-radius:10px;border:1px solid rgba(28,45,90,.14);font-size:14px;outline:none}

.pager{display:flex;gap:8px;justify-content:center;margin-top:22px;flex-wrap:wrap}
.page-btn{min-width:36px;height:36px;border-radius:10px;border:1px solid rgba(28,45,90,.14);background:#fff;cursor:pointer}
.page-btn.on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ---------- 详情 ---------- */
.detail-hero{padding:26px 28px}
.detail-title-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.detail-title-row h1{font-size:22px;flex:1}
.price-badge{background:var(--brand);color:#fff;padding:3px 12px;border-radius:10px;font-size:13px}
.free-badge{background:var(--ok);color:#fff;padding:3px 12px;border-radius:10px;font-size:13px}
.detail-meta{display:flex;flex-wrap:wrap;gap:14px;margin:16px 0;font-size:13px;color:var(--ink-2)}
.detail-desc{margin-bottom:18px;color:var(--ink-2);line-height:1.7;font-size:14px}
.detail-actions{display:flex;align-items:center;gap:12px}
.dl-state{font-size:13px}
.dl-state .err{color:var(--err)} .dl-state .warn{color:var(--warn)} .dl-state .ok{color:var(--ok)}

/* 教案 */
.lesson-plan{padding:24px;line-height:1.9;color:#333}
.lesson-plan p{margin-bottom:12px}
.lesson-plan .plan-body{background:#fff;padding:16px;border-radius:12px;border:1px solid rgba(28,45,90,.06);margin-top:8px}

/* 希沃 / 文档预览 */
.seewo-preview,.doc-preview{padding:14px}
.seewo-toolbar{display:flex;align-items:center;gap:14px;margin-bottom:10px}
.seewo-toolbar button{padding:7px 16px;border-radius:10px;border:1px solid rgba(28,45,90,.14);background:#fff;cursor:pointer}
.seewo-frame,.doc-frame{width:100%;height:560px;border:1px solid rgba(28,45,90,.1);border-radius:12px;background:#fff}

/* ---------- 认证 / 上传 / 表单 ---------- */
.auth-wrap{display:flex;justify-content:center;padding:40px 18px}
.auth-card{width:100%;max-width:400px;padding:30px 28px;display:flex;flex-direction:column;gap:14px}
.auth-card h2{text-align:center;font-size:22px}
.auth-card input{width:100%;padding:13px 16px;border-radius:12px;border:1px solid rgba(28,45,90,.16);font-size:15px;outline:none;background:#fff}
.auth-card input:focus{border-color:var(--brand)}
.auth-tip{color:var(--err);font-size:13px;text-align:center;min-height:18px}
.auth-switch{text-align:center;font-size:13px;color:var(--ink-3)}
.auth-switch a{color:var(--brand)}

.upload-card{padding:24px;max-width:820px;margin:0 auto}
.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.form-row label{font-size:13px;color:var(--ink-2);font-weight:600}
.form-row input,.form-row select,.form-row textarea{padding:11px 14px;border-radius:11px;border:1px solid rgba(28,45,90,.16);font-size:14px;outline:none;background:#fff;font-family:inherit}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{border-color:var(--brand)}
.form-row textarea{resize:vertical}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 16px}
.form-actions{display:flex;align-items:center;gap:12px;margin-top:8px}
.form-actions .err{color:var(--err)} .form-actions .ok{color:var(--ok)}

/* ---------- 个人中心 ---------- */
.orders-list{padding:14px;display:flex;flex-direction:column;gap:4px}
.order-row{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-radius:12px;background:#fff;border:1px solid rgba(28,45,90,.06)}
.order-no{font-size:12px;color:var(--ink-3)}
.order-right{display:flex;align-items:center;gap:10px}
.amt{color:var(--brand);font-weight:700}
.badge{padding:2px 10px;border-radius:8px;font-size:12px}
.badge.ok{background:rgba(18,183,106,.12);color:var(--ok)}
.badge.warn{background:rgba(247,144,9,.14);color:var(--warn)}

.empty{text-align:center;color:var(--ink-3);padding:40px;font-size:14px}

/* ---------- Loading 转圈 ---------- */
.loading-mask{position:fixed;inset:0;z-index:999;background:rgba(255,255,255,.55);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center}
.loading-mask[hidden]{display:none}
.spinner{width:44px;height:44px;border:4px solid rgba(59,110,246,.18);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 移动端底部液化玻璃 Tab（可滑动） ---------- */
.glass-tabbar{
  position:fixed;bottom:0;left:0;right:0;z-index:90;height:calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  background:var(--glass-bg-strong);backdrop-filter:blur(22px) saturate(200%);-webkit-backdrop-filter:blur(22px) saturate(200%);
  border-top:.5px solid var(--glass-border);box-shadow:0 -4px 24px rgba(28,45,90,.08);
  padding-bottom:env(safe-area-inset-bottom);
}
.tabbar-track{display:flex;overflow-x:auto;scrollbar-width:none;height:100%;align-items:center;gap:2px;padding:0 8px}
.tabbar-track::-webkit-scrollbar{display:none}
.tab-item{flex:0 0 auto;min-width:72px;display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 6px;border-radius:14px;color:var(--ink-3);transition:.2s;position:relative}
.tab-item .tab-ic{font-size:19px;line-height:1}
.tab-item .tab-tx{font-size:11px}
.tab-item.on{color:var(--brand);background:rgba(59,110,246,.1)}
.tab-item.on .tab-ic{transform:scale(1.1)}

/* ---------- 页脚 ---------- */
.page-footer{text-align:center;color:var(--ink-3);font-size:12px;padding:22px 16px 90px}

/* ---------- 响应式 ---------- */
@media (max-width:720px){
  .nav-links{display:none}
  .page-shell{padding:16px 14px}
  .resource-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .form-grid{grid-template-columns:1fr}
  .stage-cards{grid-template-columns:1fr}
  .seewo-frame,.doc-frame{height:420px}
  .home-hero{padding:30px 20px}
}
@media (max-width:420px){
  .resource-grid{grid-template-columns:1fr 1fr}
  .res-thumb{height:92px;font-size:26px}
}