/* ==========================================================
   桌面端皮肤 · 学习机式大屏布局（商用字号标准）
   只在 ≥1024px 生效，手机 / 平板 保持原有 App 形态不变
   ========================================================== */

/* 课本封面卡：手机端不显示，桌面端由下方媒体查询打开 */
.hcov { display: none; }

@media (min-width: 1024px) {

  :root {
    --r-lg: 20px;
    --r-md: 14px;
    --shadow: 0 1px 2px rgba(24, 34, 70, .05), 0 12px 32px rgba(24, 34, 70, .08);
    --shadow-hi: 0 3px 8px rgba(24, 34, 70, .07), 0 22px 52px rgba(24, 34, 70, .13);
    --side-w: 300px;
  }

  /* ---------- 全局排版：电脑端整体放大（正文 21px 起） ---------- */
  body {
    font-size: 21px;
    line-height: 1.66;
    padding-left: var(--side-w);
    padding-bottom: 0;
    background:
      radial-gradient(1100px 520px at 12% -8%, #EAF2FF 0%, rgba(234, 242, 255, 0) 62%),
      radial-gradient(900px 460px at 100% 0%, #FFF0E4 0%, rgba(255, 240, 228, 0) 58%),
      linear-gradient(180deg, #F7F9FD 0%, #EEF2F9 100%);
    background-attachment: fixed;
    overflow-x: hidden;
  }
  h1, h2, h3, h4 { letter-spacing: -.01em; }

  /* 细滚动条 */
  ::-webkit-scrollbar { width: 11px; height: 11px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: rgba(38, 43, 56, .2); border-radius: 99px; border: 3px solid transparent; background-clip: content-box; }
  ::-webkit-scrollbar-thumb:hover { background: rgba(38, 43, 56, .34); background-clip: content-box; }

  /* ---------- 顶栏：软件标题栏 ---------- */
  .top {
    height: 82px;
    padding: 0 38px;
    gap: 16px;
    background: rgba(255, 255, 255, .9);
    border-bottom: 1px solid rgba(38, 43, 56, .07);
    box-shadow: 0 1px 0 rgba(255, 255, 255, .7) inset, 0 6px 22px rgba(24, 34, 70, .05);
  }
  .top .tt h2 { font-size: 27px; font-weight: 700; }
  .top .tt small { font-size: 16px; }
  .top .back {
    width: 48px; height: 48px; border-radius: 15px; font-size: 25px;
    box-shadow: 0 2px 8px rgba(24, 34, 70, .08);
    transition: transform .16s, box-shadow .16s, background .16s;
  }
  .top .back:hover { background: var(--brand-soft); color: #D96A1A; box-shadow: 0 4px 14px rgba(255, 138, 61, .28); }

  /* ---------- 内容容器 ---------- */
  .wrap { max-width: 1240px; padding: 36px 44px 70px; }
  .card {
    padding: 28px 30px;
    margin-bottom: 20px;
    border-radius: var(--r-lg);
    box-shadow: var(--shadow);
    transition: transform .18s cubic-bezier(.2, .8, .3, 1), box-shadow .18s;
  }
  .card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hi); }

  /* 手机底部导航在电脑端隐藏，改由左侧栏导航 */
  .tabbar { display: none !important; }

  /* ---------- 左侧导航（由 desktop.js 注入） ---------- */
  .dside {
    position: fixed; left: 0; top: 0; bottom: 0; width: var(--side-w); z-index: 70;
    display: flex; flex-direction: column;
    padding: 24px 16px 18px;
    background: linear-gradient(168deg, #1D2647 0%, #25325B 48%, #2E3E6C 100%);
    color: #E7ECF8;
    box-shadow: 6px 0 28px rgba(20, 28, 60, .18);
    overflow: hidden;                      /* 关键：不允许出现横向滚动条 */
  }
  .dside::after {
    content: ""; position: absolute; right: -70px; top: -60px;
    width: 230px; height: 230px; border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 168, 92, .22), rgba(255, 168, 92, 0) 70%);
    pointer-events: none;
  }

  /* 品牌区：书名 · 版本 写清楚 */
  .dbrand { display: flex; align-items: flex-start; gap: 12px; padding: 0 6px 18px; position: relative; }
  .dlogo {
    width: 48px; height: 48px; border-radius: 14px; flex: none;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; font-weight: 800; letter-spacing: .02em; color: #fff;
    background: linear-gradient(135deg, #FFB15C, #FF7A2F);
    box-shadow: 0 6px 16px rgba(255, 122, 47, .38);
  }
  .dbrand .dtxt { min-width: 0; flex: 1; }
  .dbrand .bt { font-size: 20px; font-weight: 700; color: #fff; line-height: 1.28; letter-spacing: .01em; }
  .dbrand .bs { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 7px; }
  .dbrand .tagp {
    font-size: 12px; line-height: 1; padding: 5px 9px; border-radius: 7px;
    color: #FFD9B4; background: rgba(255, 138, 61, .18);
    border: 1px solid rgba(255, 138, 61, .3);
  }
  .dbrand .bs2 { font-size: 12.5px; color: rgba(231, 236, 248, .55); margin-top: 7px; }

  .dlabel {
    font-size: 12px; letter-spacing: .16em; text-transform: uppercase;
    color: rgba(231, 236, 248, .45); padding: 13px 10px 7px;
  }
  /* 中间滚动区：空间不够时整体滚动，不再把「单元」压扁 */
  .dscroll { flex: 1; min-height: 0; overflow-y: auto; overflow-x: hidden; }
  .dscroll::-webkit-scrollbar { width: 7px; }
  .dscroll::-webkit-scrollbar-track { background: transparent; }
  .dscroll::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .16); border-radius: 99px; }
  .dscroll::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, .3); }
  .dnav, .dunits { display: grid; gap: 3px; }
  .dside a {
    display: flex; align-items: flex-start; gap: 11px;
    padding: 11px 13px; border-radius: 13px;
    color: rgba(231, 236, 248, .8); text-decoration: none;
    font-size: 17px; font-weight: 500; line-height: 1.35;
    transition: background .16s, color .16s;
  }
  .dside a .ic { font-size: 19px; width: 24px; text-align: center; flex: none; line-height: 1.3; }
  .dside a .un {
    font-size: 12.5px; font-weight: 700; letter-spacing: .06em; line-height: 1.5;
    color: rgba(231, 236, 248, .5); width: 34px; flex: none;
  }
  /* 单元名完整显示（不省略号截断，最多两行） */
  .dside a .nm {
    flex: 1; min-width: 0; font-size: 15.5px;
    white-space: normal; overflow-wrap: anywhere;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  }
  /* 悬停：只做亮度/背景变化，不做位移 —— 位移会在滚动容器里产生横向溢出 */
  .dside a:hover { background: rgba(255, 255, 255, .09); color: #fff; }
  .dside a.on {
    background: linear-gradient(90deg, rgba(255, 138, 61, .95), rgba(255, 138, 61, .55));
    color: #fff; font-weight: 600;
    box-shadow: 0 6px 18px rgba(255, 138, 61, .3);
  }
  .dside a.on .un, .dside a.on .ic { color: #fff; }
  .dfoot {
    flex: none; padding: 14px 10px 2px; font-size: 15px;
    color: rgba(231, 236, 248, .6); border-top: 1px solid rgba(255, 255, 255, .1);
    display: flex; align-items: baseline; gap: 5px;
  }
  .dfoot b { color: #FFC48A; font-weight: 700; font-size: 18px; }
  .dfoot .fs { font-size: 13px; color: rgba(231, 236, 248, .45); }

  /* ---------- 首页 Hero：左文案 + 右课本封面（封面绝对定位，不改 DOM 层级） ---------- */
  .hero {
    position: relative;
    padding: 52px 316px 48px 46px;
    min-height: 372px;
    border-radius: 28px;
    margin-bottom: 22px;
    box-shadow: 0 20px 48px rgba(47, 127, 208, .3);
  }
  .hero small { font-size: 15px; }
  .hero h1 { font-size: 50px; margin: 12px 0 14px; }
  .hero p { font-size: 20px; }
  .hero::after { width: 300px; height: 300px; right: -80px; bottom: -90px; }

  .hcov {
    display: block; position: absolute; right: 46px; top: 50%;
    transform: translateY(-50%); z-index: 3;
    width: 202px; text-align: center; pointer-events: auto;
  }
  .hcov .bk {
    position: relative; border-radius: 13px; overflow: hidden;
    box-shadow: 0 26px 50px rgba(10, 24, 56, .45), 0 0 0 1px rgba(255, 255, 255, .22);
    transform: perspective(1200px) rotateY(-9deg) scale(1);
    transition: transform .38s cubic-bezier(.2, .8, .3, 1), box-shadow .38s;
    background: #fff;
  }
  .hcov .bk::after {       /* 书脊高光 */
    content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 15px;
    background: linear-gradient(90deg, rgba(0, 0, 0, .3), rgba(255, 255, 255, .22) 58%, rgba(0, 0, 0, 0));
  }
  .hcov img { display: block; width: 100%; height: auto; }
  .hcov:hover .bk {
    transform: perspective(1200px) rotateY(0deg) scale(1.04);
    box-shadow: 0 34px 64px rgba(10, 24, 56, .5), 0 0 0 1px rgba(255, 255, 255, .3);
  }
  .hcov .cap {
    display: inline-block; margin-top: 16px; font-size: 14px; padding: 7px 15px;
    border-radius: 99px; color: #fff; background: rgba(255, 255, 255, .22);
    border: 1px solid rgba(255, 255, 255, .32); backdrop-filter: blur(4px);
    white-space: nowrap;
  }

  /* ---------- 首页单元卡 ---------- */
  .ugrid { grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .ucard {
    padding: 24px 24px 20px;
    border-radius: var(--r-lg);
    transition: transform .2s cubic-bezier(.2, .8, .3, 1), box-shadow .2s;
  }
  .ucard:hover { transform: translateY(-4px); box-shadow: var(--shadow-hi); }
  .ucard .un { font-size: 14px; letter-spacing: .04em; }
  .ucard h3 { font-size: 25px; margin: 7px 0 6px; }
  .ucard .zh { font-size: 17.5px; }
  .ucard .st { font-size: 18px; margin-top: 14px; }

  /* ---------- 单元页封面 ---------- */
  .cover { padding: 40px 38px 36px; border-radius: 28px; margin-bottom: 20px; box-shadow: 0 20px 46px rgba(245, 106, 0, .26); }
  .cover small { font-size: 16px; }
  .cover h1 { font-size: 48px; margin: 12px 0 16px; }
  .cover .bq { font-size: 25px; padding: 13px 24px; border-radius: 18px; }
  .cover .zh { font-size: 18px; margin-top: 12px; }

  /* ---------- 板块导航：换行铺开 ---------- */
  .chips { flex-wrap: wrap; overflow: visible; gap: 11px; padding-bottom: 14px; }
  .chip { font-size: 17px; padding: 11px 20px; transition: transform .15s, box-shadow .15s, background .15s; }
  .chip:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(24, 34, 70, .1); }

  .toolbar { top: 94px; padding: 12px 14px; gap: 11px; border-radius: 18px; flex-wrap: wrap; }
  .tbtn { font-size: 18px; padding: 11px 21px; transition: transform .15s, box-shadow .15s; }
  .tbtn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(24, 34, 70, .12); }

  /* ---------- 节标题与播放 ---------- */
  .sec-head h3 { font-size: 27px; }
  .sec-head { margin-bottom: 18px; }
  .playall { font-size: 17.5px; padding: 11px 24px; }
  .playall:hover { box-shadow: 0 6px 16px rgba(255, 138, 61, .3); }
  .badge { font-size: 14px; padding: 5px 13px; }

  /* ---------- 点读内容：电脑端大字 ---------- */
  .sen { padding: 16px 20px; border-radius: 15px; }
  .sen .en { font-size: 28px; font-weight: 500; letter-spacing: .002em; line-height: 1.5; }
  .sen .zh { font-size: 18px; }
  .sen .no { font-size: 16px; min-width: 26px; }
  .sen:hover { background: rgba(74, 163, 232, .07); }

  .dia { gap: 16px; margin-bottom: 18px; }
  .avatar { width: 66px; height: 66px; font-size: 27px; }
  .bub { padding: 17px 22px; border-radius: 6px 24px 24px 24px; }
  .dia.right .bub { border-radius: 24px 6px 24px 24px; }
  .bub .rn { font-size: 14.5px; }
  .bub .en { font-size: 28px; }
  .bub .zh { font-size: 18px; }

  .wgrid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
  .wcard { padding: 20px 14px; border-radius: 20px; transition: transform .18s, box-shadow .18s; }
  .wcard:hover { transform: translateY(-3px); box-shadow: var(--shadow-hi); }
  .wcard .tile { font-size: 54px; margin-bottom: 10px; }
  .wcard .en { font-size: 25px; }
  .wcard .zh { font-size: 17px; }
  .wcard .ipa { font-size: 15px; }
  .wcard .pg { font-size: 12.5px; }

  .lgrid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; }
  .lcard { padding: 18px; }
  .lcard .big { font-size: 62px; }
  .lcard .ws { font-size: 18px; }

  .excard .head h4 { font-size: 22px; }
  .excard .head .ic { font-size: 32px; }
  .excard .zh { font-size: 20px; }

  /* ---------- 故事 / 图片 ---------- */
  .panel { margin-bottom: 22px; }
  .panel img { border-radius: 20px; box-shadow: var(--shadow); }

  /* ---------- 练习与测验 ---------- */
  .qask { font-size: 34px; margin-bottom: 11px; }
  .qtip { font-size: 18px; }
  .opts { gap: 14px; }
  .opt {
    font-size: 25px; padding: 20px 26px; border-radius: 20px;
    transition: transform .15s, box-shadow .15s, border-color .15s;
  }
  .opt:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(24, 34, 70, .1); border-color: rgba(74, 163, 232, .5); }
  .wopts { grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .wopt { padding: 22px 16px; border-radius: 20px; transition: transform .16s, box-shadow .16s; }
  .wopt:hover { transform: translateY(-3px); box-shadow: var(--shadow-hi); }
  .wopt .en { font-size: 29px; }
  .wopt .zh { font-size: 17px; }
  .wb { font-size: 24px; padding: 12px 24px; transition: transform .14s, box-shadow .14s; }
  .wb:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(24, 34, 70, .1); }
  .wordbank { gap: 11px; min-height: 70px; }
  .sortline { min-height: 74px; padding: 12px; }
  .bigtile { font-size: 104px; padding: 32px 0 14px; }
  .qfoot .btn { padding: 16px 38px; font-size: 21px; }
  .resultbig .sc { font-size: 72px; }

  /* ---------- 跟读 ---------- */
  .recwave { padding: 16px; border-radius: 18px; }
  .recwave .lb { font-size: 16.5px; }
  .recwave canvas { height: 88px; }
  .mic { width: 86px; height: 86px; font-size: 34px; }
  .bigplay { width: 96px; height: 96px; font-size: 38px; }
  .scorepick button { font-size: 19px; padding: 13px 26px; }
  .timer { font-size: 18px; }

  /* ---------- 错题本 / 家长报告 ---------- */
  .mcard .mhead h4 { font-size: 22px; }
  .mcard .mya, .mcard .mok { font-size: 18px; }
  .pill { font-size: 14px; padding: 5px 13px; }
  .stats { grid-template-columns: repeat(4, 1fr); gap: 16px; }
  .stat { padding: 22px; border-radius: 20px; }
  .stat .n { font-size: 38px; }
  .stat .l { font-size: 16.5px; }
  .ubarrow { font-size: 18px; gap: 16px; }
  .ubarrow .nm { width: 140px; }
  .dict { columns: 3; column-gap: 30px; }
  .dict div { font-size: 18px; padding: 9px 0; }

  /* ---------- 弹层：居中对话框 ---------- */
  .ovl { align-items: center; background: rgba(18, 24, 44, .5); backdrop-filter: blur(3px); }
  .sheet {
    max-width: 620px; border-radius: 26px; padding: 40px 38px;
    margin-bottom: 0; box-shadow: 0 30px 70px rgba(18, 24, 44, .3);
    animation: popup .28s cubic-bezier(.2, .8, .3, 1);
  }
  @keyframes popup { from { transform: scale(.94) translateY(14px); opacity: 0; } }
  .stars { font-size: 58px; }
  .btn { font-size: 21px; padding: 17px 48px; transition: transform .15s, box-shadow .15s; }
  .btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255, 138, 61, .32); }

  .muted { font-size: 17.5px; }
}

/* 中等宽度笔记本（1024–1419）：封面收一点，保住文案可读性 */
@media (min-width: 1024px) and (max-width: 1419px) {
  .hero { padding: 44px 254px 42px 40px; min-height: 330px; }
  .hero h1 { font-size: 44px; }
  .hero p { font-size: 18.5px; }
  .hcov { width: 168px; right: 38px; }
  .hcov .cap { font-size: 12.5px; padding: 6px 12px; }
}

/* 更宽的屏幕：内容再放宽一点 */
@media (min-width: 1560px) {
  :root { --side-w: 316px; }
  .wrap { max-width: 1400px; }
  .hero { padding-right: 336px; }
  .hero h1 { font-size: 54px; }
  .hcov { width: 216px; }
}

/* 打印时不出现侧边栏 */
@media print {
  .dside { display: none !important; }
  body { padding-left: 0 !important; }
}