/* ============================================================
   一级导航 + 英语点读视图 + 打印 + 响应式
   本文件最后加载，负责全站覆盖与移动端适配
   ============================================================ */


/* ---------- 打印 ---------- */
@media print {
  /* 打印一律用浅色，避免深色主题下白底浅字 */
  :root, [data-theme="dark"] {
    --bg: #fff; --card: #fff; --surface: #fff;
    --text: #1F2430; --text-2: #4B5563; --muted: #8A93A3;
    --border: #E8EAEF; --border-2: #F0F2F5; --border-strong: #C9CFD9;
  }
  .sidebar, .topnav, .to-top, .topbar .day-badge, .btn, .copy-btn, .rec-input, .del,
  .faq-tools, .faq-tabs, .en-bar { display: none !important; }
  .section { display: block !important; }
  /* 只有第一块不强制分页，避免开头多出一张空白页 */
  .section + .section, #view-plan > .section:not(:first-child) { page-break-before: always; }
  #view-plan > .section:first-child { page-break-before: auto; }
  body { background: #fff !important; }
  .card, .stat, .subj-card, .hl-card, .tl-node, .rec, .faq-item { box-shadow: none; }
  /* 打印时答疑全部展开，可直接当手册用 */
  .faq-a { display: block !important; }
  .faq-item, .tl-node, .cur-week { page-break-inside: avoid; }
  .main { padding: 0 !important; max-width: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .g3, .g4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--border); padding: 8px 12px; }
  .sidebar nav { display: flex; overflow-x: auto; gap: 6px; }
  .nav-item { white-space: nowrap; margin-bottom: 0; }
  .sidebar-foot { display: none; }
  .main { padding: 18px 16px 60px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .time-item { flex-wrap: wrap; }
  .time-item .t { width: auto; }
  .time-item .a { width: auto; }
  .time-item .w { display: none; }
  .time-item .n { flex-basis: 100%; }
}

/* ============================================================
   一级导航
   ------------------------------------------------------------
   App 标识只在这里出现一次；侧边栏只放导航，不再重复标题。
   ============================================================ */
.topnav {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; gap: 20px;
  padding: 10px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(16,24,40,.03);
}
.tn-left { display: flex; align-items: center; gap: 10px; flex-shrink: 0; min-width: 0; }
.tn-logo { font-size: 22px; line-height: 1; }
.tn-title { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.tn-title strong { font-size: 15px; font-weight: 700; letter-spacing: -.2px; white-space: nowrap; }
.tn-sub { font-size: 11.5px; color: var(--muted); white-space: nowrap; }

.tn-tabs { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.tn-tab {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid transparent; background: transparent;
  color: var(--text-2); font-family: inherit; font-size: 13.5px; font-weight: 600;
  padding: 7px 15px; border-radius: 999px; cursor: pointer;
  transition: background .14s, color .14s, border-color .14s;
}
.tn-tab .ti { font-size: 15px; line-height: 1; }
.tn-tab:hover { background: var(--border-2); color: var(--text); }
.tn-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tn-tab.active:hover { background: var(--primary); color: #fff; }

.tn-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.tn-ico {
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2);
  width: 34px; height: 34px; border-radius: 10px; cursor: pointer;
  font-size: 15px; line-height: 1; display: flex; align-items: center; justify-content: center;
}
.tn-ico:hover { border-color: var(--border-strong); }

/* 侧边栏顶部跟随一级导航高度，避免双 sticky 冲突（高度由 core.js 实测写入 --topnav-h） */
.sidebar { top: var(--topnav-h, 55px); height: calc(100vh - var(--topnav-h, 55px)); }

.nav-group-lbl {
  font-size: 11px; font-weight: 700; color: var(--muted);
  letter-spacing: .3px; text-transform: none;
  padding: 14px 12px 6px;
}
.nav-group-lbl:first-child { padding-top: 2px; }

/* 视图切换 */
.view { display: none; }
.view.active { display: block; }

/* ============================================================
   英语点读册
   ============================================================ */
.en-howto { padding: 16px 18px; }
.en-howto h3 { font-size: 14px; margin: 0 0 10px; }
.en-howto ol { margin: 0; padding-left: 20px; font-size: 13px; color: var(--text-2); }
.en-howto li { margin: 5px 0; }
.en-howto li b { color: var(--text); font-weight: 600; }

.en-bar {
  position: sticky; top: var(--topnav-h, 55px); z-index: 30;
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
  background: var(--bg); border-bottom: 1px solid var(--border);
  margin: 0 -34px 16px; padding: 10px 34px;
}
.en-bar .lbl { font-size: 12px; color: var(--muted); }
.en-bar .spacer { flex: 1; }
.seg { display: flex; border: 1px solid var(--border); border-radius: 9px; overflow: hidden; background: var(--card); }
.seg button {
  border: 0; background: transparent; padding: 5px 12px; font-size: 12.5px;
  color: var(--text-2); cursor: pointer; font-family: inherit;
}
.seg button.on { background: var(--primary); color: #fff; }
.seg button:not(.on):hover { background: var(--border-2); }

.chips { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 22px; }
.chips a {
  font-size: 12.5px; text-decoration: none; color: var(--text-2);
  background: var(--card); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px;
  cursor: pointer;
}
.chips a.core { background: var(--green-soft); border-color: var(--green); color: var(--green); }
.chips a:hover { border-color: var(--border-strong); color: var(--text); }
.chips a.active { border-color: var(--primary); color: var(--primary); font-weight: 600; }
.chips a.core.active { background: var(--green-soft); border-color: var(--green); color: var(--green); }

#view-en section { margin-bottom: 26px; scroll-margin-top: 120px; }
.en-shead { display: flex; align-items: baseline; gap: 10px; margin: 0 0 4px; flex-wrap: wrap; }
.en-shead h2 { font-size: 15.5px; font-weight: 700; margin: 0; }
.badge { font-size: 11px; padding: 1px 7px; border-radius: 999px; background: var(--border-2); color: var(--text-2); }
.badge.core { background: var(--green-soft); color: var(--green); }
.playall {
  font-size: 12.5px; color: var(--primary); background: none; border: 0;
  cursor: pointer; font-family: inherit; padding: 0 0 0 4px; font-weight: 600;
}
.playall.busy { color: var(--red); }
.en-sdesc { font-size: 12.5px; color: var(--muted); margin: 0 0 12px; }

.en-grid { display: grid; grid-template-columns: 1fr; gap: 8px; }
@media (min-width: 760px) { .en-grid { grid-template-columns: 1fr 1fr; } }

.en-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; cursor: pointer; display: flex; gap: 12px; align-items: flex-start;
  transition: border-color .12s, box-shadow .12s;
}
.en-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.en-card.playing { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.en-play {
  flex: none; width: 32px; height: 32px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--primary-soft); color: var(--primary); font-size: 12px;
  display: flex; align-items: center; justify-content: center; font-family: inherit; padding-left: 2px;
}
.en-card.playing .en-play { background: var(--primary); color: #fff; }
.en-body { flex: 1; min-width: 0; }
.en-en { font-size: 15.5px; font-weight: 600; letter-spacing: .1px; word-break: break-word; }
.en-zh { font-size: 13px; color: var(--text-2); margin-top: 2px; }
.en-py {
  font-size: 12.5px; color: var(--amber); margin-top: 5px;
  background: var(--amber-soft); border-radius: 7px; padding: 3px 8px; display: inline-block;
}
.en-slowbtn {
  flex: none; border: 1px solid var(--border); background: transparent; color: var(--muted);
  border-radius: 8px; font-size: 11px; padding: 4px 7px; cursor: pointer; font-family: inherit;
}
.en-slowbtn:hover { color: var(--amber); border-color: var(--amber); }

body.hidezh .en-zh { display: none; }
body.hidepy .en-py { display: none; }
body.hideen .en-en { filter: blur(6px); transition: filter .15s; }
body.hideen .en-card:hover .en-en { filter: none; }
/* 自测模式（遮英文）下，正在播放的这句自动显形，方便对照 */
body.hideen .en-card.playing .en-en { filter: none; }

.foot { font-size: 12px; color: var(--muted); border-top: 1px solid var(--border); padding-top: 14px; margin-top: 8px; }
.foot .dl {
  display: inline-block; margin-top: 8px; color: var(--primary); text-decoration: none;
  border: 1px solid var(--border); border-radius: 9px; padding: 5px 12px; background: var(--card);
}
.foot .dl:hover { border-color: var(--border-strong); }

/* 移动端：侧边栏收成横滑条，只显示当前入口的菜单。
   注意：这段必须排在上面桌面端 .sidebar 的 sticky/height 规则之后，
   否则媒体查询不会因为"更靠内层"而赢得层叠，会被覆盖成整屏高。 */
@media (max-width: 760px) {
  .sidebar {
    position: relative; top: auto;
    width: 100%; height: auto;
    border-right: none; border-bottom: 1px solid var(--border);
    padding: 8px 12px;
  }
  .sidebar nav {
    display: flex; overflow-x: auto; gap: 6px; padding-bottom: 2px;
    scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .sidebar nav::-webkit-scrollbar { display: none; }
  .sidebar nav[hidden] { display: none !important; }
  .nav-group-lbl { display: none; }
  .nav-plan .nav-item, .nav-en .nav-item, .nav-tt .nav-item {
    white-space: nowrap; margin-bottom: 0; padding: 9px 13px; flex-shrink: 0;
    min-height: 40px; scroll-snap-align: start;
  }
  .nav-plan .nav-item .ic, .nav-en .nav-item .ic, .nav-tt .nav-item .ic { margin-right: 4px; }
  /* 右侧渐隐，提示还能往右滑 */
  .sidebar::after {
    content: ''; position: absolute; right: 0; top: 6px; bottom: 6px; width: 26px;
    background: linear-gradient(to right, transparent, var(--card));
    pointer-events: none;
  }
}

/* 移动端顶栏：第一行 App 标识 + 主题按钮，第二行整行均分放三个入口
   —— 三个按钮各占 1/3 宽度，不会再被标题挤掉、也不会点不到 */
@media (max-width: 760px) {
  .topnav { flex-wrap: wrap; gap: 6px 8px; padding: 8px 12px; }
  .tn-left { flex: 1 1 auto; min-width: 0; gap: 8px; overflow: hidden; }
  .tn-logo { font-size: 20px; }
  .tn-title { overflow: hidden; }
  .tn-title strong { font-size: 14px; overflow: hidden; text-overflow: ellipsis; }
  .tn-sub { display: none; }            /* 副标题与下方页面副标题重复，手机上一律不显示 */
  .tn-right { flex: 0 0 auto; }
  .tn-ico { width: 32px; height: 32px; }
  .tn-tabs {
    order: 3; flex: 0 0 100%; width: 100%;
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 6px; overflow: visible; flex-wrap: nowrap;
  }
  .tn-tab {
    justify-content: center; padding: 9px 4px; font-size: 13px;
    min-height: 42px; border-radius: 10px; gap: 4px;
  }
  .tn-tab .ti { font-size: 14px; }
  /* 英语工具条手机端不换行，改成单行横滑：折成三行会吃掉近 90px 屏高 */
  .en-bar {
    top: var(--topnav-h, 0px); margin: 0 -16px 14px; padding: 8px 16px;
    flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none;
  }
  .en-bar::-webkit-scrollbar { display: none; }
  .en-bar .lbl, .en-bar .spacer { display: none; }
  .en-bar .seg { flex: none; }
  .en-bar .seg button { padding: 7px 12px; }
}

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 70;
  width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--card); color: var(--text-2);
  font-size: 17px; line-height: 1; cursor: pointer;
  box-shadow: var(--shadow-hover);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .2s, visibility .2s, transform .2s, color .15s, border-color .15s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--primary); border-color: var(--primary); }

/* ---------- 键盘焦点可见 ---------- */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
.cur-lesson:focus-visible, .en-card:focus-visible { outline-offset: -3px; }

/* 课程表：当前选中的格子 */
.cur-lesson.picked { outline: 2px solid var(--primary); outline-offset: -2px; }

/* ---------- 尊重系统"减少动态效果" ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}