/* ================= 光之学院 · 样式（暖色教材质感 · 移动优先） ================= */
:root {
  --paper: #f4f1ea;
  --card: #fffdf7;
  --ink: #2b2825;
  --ink-soft: #7c7566;
  --ink-faint: #a89f8d;
  --line: #e5ded0;
  --line-soft: #efe9dc;
  --accent: #b0503a;      /* 赭红 */
  --accent-dk: #8f3f2d;
  --accent-tint: #f3e7e1;
  --gold: #b8892f;        /* 能量 / 星 */
  --ok: #3f7d52;
  --ok-tint: #e7f1e8;
  --bad: #b0463a;
  --bad-tint: #f7e7e4;
  --serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --shadow: 0 1px 2px rgba(60, 50, 35, 0.05);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh;
  font-family: var(--sans);
  background: var(--paper); color: var(--ink);
  font-size: 15px; line-height: 1.6;
}
button { font-family: inherit; }
a { text-decoration: none; color: inherit; }

/* ---------- 顶栏 ---------- */
/* 注意：不要在 #topbar 上使用 filter/backdrop-filter，否则会成为固定定位的包含块，
   导致移动端置底的 #mainnav 被限制在顶栏内而非视口底部 */
#topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.tb-inner {
  max-width: 960px; margin: 0 auto; padding: 0 16px;
  display: flex; align-items: center; gap: 12px; height: 54px;
}
.logo { display: flex; align-items: baseline; gap: 7px; font-family: var(--serif); font-size: 20px; font-weight: 700; color: var(--ink); white-space: nowrap; }
.logo-ico { font-size: 18px; color: var(--accent); }
.logo small { font-size: 11px; font-weight: 400; color: var(--ink-faint); font-family: var(--sans); }

/* 移动端：主导航置底为标签栏 */
#mainnav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  display: flex; justify-content: space-around;
  background: var(--card); border-top: 1px solid var(--line);
  padding: 5px 4px calc(5px + env(safe-area-inset-bottom, 0px));
}
#mainnav a {
  flex: 1; text-align: center; padding: 8px 2px;
  font-size: 12px; color: var(--ink-soft); border-radius: 8px;
}
#mainnav a.on { color: var(--accent); font-weight: 700; }

.energy {
  margin-left: auto;
  background: var(--card); color: var(--gold);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 5px 11px; font-weight: 700; font-size: 14px; white-space: nowrap;
}
.energy b { color: var(--gold); font-variant-numeric: tabular-nums; }

#view { max-width: 960px; margin: 0 auto; padding: 18px 16px calc(76px + env(safe-area-inset-bottom, 0px)); }
#pagefoot { text-align: center; color: var(--ink-faint); font-size: 12px; padding: 8px 16px calc(84px + env(safe-area-inset-bottom, 0px)); }

/* ---------- 通用 ---------- */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; box-shadow: var(--shadow); }
.grid2, .grid3, .grid4 { display: grid; gap: 12px; }
.grid2 { grid-template-columns: 1fr; }
.grid3, .grid4 { grid-template-columns: 1fr 1fr; }
.sec-title { display: flex; align-items: baseline; gap: 9px; margin: 24px 0 12px; font-family: var(--serif); font-size: 18px; font-weight: 700; }
.sec-title small { font-family: var(--sans); font-weight: 400; color: var(--ink-faint); font-size: 12.5px; }
.crumb { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; color: var(--ink-soft); font-size: 13px; margin-bottom: 12px; }
.crumb a { color: var(--accent); }
.crumb .sep { color: var(--ink-faint); }
.pill { display: inline-block; font-size: 11.5px; padding: 2px 8px; border-radius: 5px; background: var(--line-soft); color: var(--ink-soft); font-weight: 500; }
.pill.gold { background: #f6edd8; color: var(--gold); }
.pill.green { background: var(--ok-tint); color: var(--ok); }
.pill.gray { background: var(--line-soft); color: var(--ink-soft); }

.btn {
  border: 1px solid var(--accent); border-radius: 8px; cursor: pointer;
  font-size: 14.5px; font-weight: 600; padding: 9px 16px; min-height: 42px;
  background: var(--accent); color: #fff; transition: background .12s;
}
.btn:hover { background: var(--accent-dk); }
.btn:active { transform: translateY(1px); }
.btn.lg { font-size: 16px; min-height: 48px; }
.btn.ghost { background: var(--card); color: var(--accent); }
.btn.ghost:hover { background: var(--accent-tint); }
.btn.warn { background: var(--card); color: var(--bad); border-color: #e2c3bd; }
.btn.warn:hover { background: var(--bad-tint); }
.btn.plain { background: var(--card); color: var(--ink-soft); border-color: var(--line); }
.btn.plain:hover { background: var(--line-soft); }
.btn:disabled { opacity: .45; cursor: default; }

.progress { height: 7px; border-radius: 99px; background: var(--line-soft); overflow: hidden; }
.progress > i { display: block; height: 100%; border-radius: 99px; background: var(--accent); transition: width .4s; }
.progress.gold > i { background: var(--gold); }

/* ---------- 首页刊头 ---------- */
.hero-home { padding: 6px 0 18px; border-bottom: 1px solid var(--line); }
.hero-home h1 { margin: 0 0 8px; font-family: var(--serif); font-size: 27px; font-weight: 700; letter-spacing: .02em; }
.hero-home .lead { margin: 0 0 6px; color: var(--ink); font-size: 15px; }
.hero-home .meta { margin: 0; color: var(--ink-faint); font-size: 12.5px; letter-spacing: .02em; }

.stat-tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.stat-tiles .tile { background: var(--card); border: 1px solid var(--line); border-radius: 9px; padding: 12px 14px; }
.tile b { display: block; font-family: var(--serif); font-size: 22px; color: var(--ink); font-variant-numeric: tabular-nums; }
.tile span { font-size: 12px; color: var(--ink-soft); }

.subcard { display: flex; flex-direction: column; gap: 9px; cursor: pointer; border: 1px solid var(--line); border-radius: 10px; padding: 15px; background: var(--card); text-align: left; transition: border-color .15s, box-shadow .15s; }
.subcard:hover { border-color: var(--ink-faint); box-shadow: var(--shadow); }
.subcard .sc-head { display: flex; align-items: center; gap: 11px; }
.subcard .sc-ico { width: 42px; height: 42px; border-radius: 7px; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 23px; font-weight: 700; color: #fff; flex: none; }
.subcard h3 { margin: 0; font-size: 17px; font-weight: 700; }
.subcard .sc-meta { font-size: 12px; color: var(--ink-soft); }

.continue-row { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); cursor: pointer; }
.continue-row .ci { width: 40px; height: 40px; border-radius: 7px; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 21px; font-weight: 700; color: #fff; flex: none; }
.continue-row .ct { flex: 1; min-width: 0; }
.continue-row .ct b { display: block; font-size: 14.5px; }
.continue-row .ct span { font-size: 12px; color: var(--ink-soft); }

.home-tip { margin-top: 20px; }
.home-tip .note { line-height: 1.85; }

/* ---------- 学科目录页 ---------- */
.subj-head { display: flex; align-items: center; gap: 10px; margin: 22px 0 14px; }
.subj-head .mk { width: 34px; height: 34px; border-radius: 7px; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 19px; font-weight: 700; color: #fff; }
.subj-head h2 { margin: 0; font-family: var(--serif); font-size: 20px; }

.stage-tabs { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 12px; }
.stage-tabs button { border: 1px solid var(--line); background: var(--card); color: var(--ink-soft); border-radius: 7px; padding: 7px 15px; font-size: 14px; font-weight: 600; cursor: pointer; }
.stage-tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.grade-chips { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 12px; }
.grade-chips button { border: 1px solid transparent; background: var(--line-soft); color: var(--ink-soft); border-radius: 7px; padding: 7px 13px; font-size: 13.5px; font-weight: 600; cursor: pointer; }
.grade-chips button.on { background: var(--accent-tint); color: var(--accent); border-color: var(--accent); }
.book-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 2px; }
.book-tabs button { border: none; background: none; cursor: pointer; padding: 9px 18px; font-family: var(--serif); font-size: 15px; font-weight: 700; color: var(--ink-faint); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.book-tabs button.on { color: var(--accent); border-bottom-color: var(--accent); }
.book-summary { display: flex; align-items: center; gap: 10px; padding: 12px 2px; font-size: 12.5px; color: var(--ink-soft); flex-wrap: wrap; }
.book-summary .progress { flex: 1; min-width: 120px; }

.unit-row { display: flex; align-items: center; gap: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 9px; padding: 12px 14px; margin-bottom: 9px; }
.unit-row .un { width: 30px; height: 30px; border-radius: 6px; background: var(--line-soft); color: var(--ink-soft); font-family: var(--serif); font-weight: 700; font-size: 15px; display: flex; align-items: center; justify-content: center; flex: none; }
.unit-row .ut { flex: 1; min-width: 0; }
.unit-row .ut b { display: block; font-size: 15px; margin-bottom: 4px; font-weight: 600; }
.unit-row .tags { display: flex; gap: 5px; flex-wrap: wrap; }
.unit-row .stars { color: var(--gold); font-size: 14px; letter-spacing: 1px; white-space: nowrap; }
.unit-row .stars .dim { color: var(--line); }

/* ---------- 练习页 ---------- */
.prac-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.prac-head .crumb { margin: 0; flex: 1; }
.qbar { display: flex; gap: 4px; margin-bottom: 16px; }
.qbar i { flex: 1; height: 5px; border-radius: 99px; background: var(--line); }
.qbar i.ok { background: var(--ok); }
.qbar i.bad { background: var(--bad); }
.qbar i.cur { background: var(--accent); }

.qcard { background: var(--card); border-radius: 12px; border: 1px solid var(--line); padding: 22px 18px 24px; box-shadow: var(--shadow); }
.qtype { font-size: 12px; font-weight: 600; color: var(--accent); background: var(--accent-tint); display: inline-block; padding: 3px 9px; border-radius: 5px; margin-bottom: 12px; }
.qtext { font-size: 19px; font-weight: 600; line-height: 1.75; }
.qtext .big-emoji { font-size: 56px; line-height: 1.35; display: block; text-align: center; }
.qtext .big-zi { font-size: 50px; display: block; text-align: center; line-height: 1.4; font-family: var(--serif); }
.qtext .big-word { font-family: var(--serif); }
.qtext .expr { font-size: 32px; letter-spacing: 1px; font-variant-numeric: tabular-nums; }
.qtext .crow { line-height: 1.5; font-size: 25px; word-break: break-all; }
.qvis { margin-top: 8px; color: var(--ink-soft); font-size: 14px; }
.speak-btn { border: 1px solid var(--line); cursor: pointer; background: var(--card); color: var(--accent); font-size: 22px; width: 56px; height: 56px; border-radius: 50%; margin: 10px auto; display: block; }
.speak-btn:active { background: var(--accent-tint); }

.opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
.opts.list { grid-template-columns: 1fr; }
.opt {
  border: 1px solid var(--line); border-radius: 9px; cursor: pointer;
  background: var(--card); color: var(--ink); min-height: 58px;
  font-size: 20px; font-weight: 600; padding: 10px 14px;
  display: flex; align-items: center; justify-content: center; text-align: center;
}
.opt .sm { font-size: 15.5px; line-height: 1.55; font-weight: 500; }
.opt .zi { font-size: 30px; font-family: var(--serif); }
.opt .emoji { font-size: 38px; }
.opt .btxt { font-weight: 600; }
.opt:hover { border-color: var(--ink-faint); }
.opt.right { background: var(--ok-tint); border-color: var(--ok); color: var(--ok); }
.opt.wrong { background: var(--bad-tint); border-color: var(--bad); color: var(--bad); animation: shake .35s ease; }
.opt.reveal { border-color: var(--ok); background: var(--ok-tint); }
.opt:disabled { cursor: default; }
@keyframes shake { 25% { transform: translateX(-6px); } 55% { transform: translateX(6px); } 80% { transform: translateX(-3px); } }

.judge-btns { display: flex; gap: 14px; justify-content: center; margin-top: 20px; }
.judge-btns .opt { width: 44%; max-width: 150px; font-size: 30px; }

.ansbox { margin: 18px auto 4px; min-height: 54px; max-width: 320px; border-bottom: 2px solid var(--accent); font-family: var(--serif); font-size: 30px; font-weight: 700; display: flex; align-items: center; justify-content: center; letter-spacing: 2px; font-variant-numeric: tabular-nums; color: var(--accent); }
.ansbox.empty { color: var(--ink-faint); font-size: 16px; font-weight: 400; font-family: var(--sans); }
.keypad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; max-width: 320px; margin: 14px auto 0; }
.keypad button { border: 1px solid var(--line); border-radius: 8px; cursor: pointer; min-height: 50px; font-size: 21px; font-weight: 600; background: var(--card); color: var(--ink); }
.keypad button:active { background: var(--line-soft); }
.keypad .kc { color: var(--bad); font-size: 16px; }
.keypad .kok { background: var(--accent); color: #fff; border-color: var(--accent); grid-column: span 2; font-size: 16px; }

.match-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; margin-top: 18px; max-width: 480px; margin-left: auto; margin-right: auto; }
.mitem { border: 1px solid var(--line); border-radius: 9px; background: var(--card); min-height: 52px; font-size: 17px; font-weight: 600; cursor: pointer; padding: 8px 12px; display: flex; align-items: center; justify-content: center; text-align: center; }
.mitem.sel { border-color: var(--accent); background: var(--accent-tint); color: var(--accent); }
.mitem.done { border-color: var(--ok); background: var(--ok-tint); color: var(--ok); cursor: default; }
.mitem.flash { animation: shake .35s ease; border-color: var(--bad); }

.sort-ans { min-height: 56px; border: 1px dashed var(--ink-faint); border-radius: 10px; margin-top: 18px; padding: 8px; display: flex; flex-wrap: wrap; gap: 7px; align-items: center; justify-content: center; }
.sort-ans .ph { color: var(--ink-faint); font-size: 13.5px; }
.sort-pool { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 14px; }
.token { border: 1px solid var(--line); border-radius: 8px; background: var(--card); cursor: pointer; font-size: 19px; font-weight: 600; padding: 9px 15px; min-width: 44px; }
.token.in-ans { border-color: var(--accent); background: var(--accent-tint); color: var(--accent); }
.token.used { opacity: .28; pointer-events: none; }
.token.letter { font-size: 22px; text-transform: lowercase; min-width: 48px; font-family: var(--serif); }
.sort-check { display: block; margin: 16px auto 0; min-width: 160px; }

.feedback { margin-top: 18px; border-radius: 9px; padding: 13px 15px; font-size: 15px; font-weight: 600; display: none; }
.feedback.ok { display: block; background: var(--ok-tint); color: var(--ok); }
.feedback.bad { display: block; background: var(--bad-tint); color: var(--bad); }
.feedback .exp { display: block; margin-top: 6px; font-weight: 400; font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }
.nextbtn { display: block; margin: 16px auto 0; min-width: 170px; }

/* ---------- 结果页 ---------- */
.result-card { text-align: center; padding: 30px 20px; }
.result-card .rm { font-size: 60px; }
.result-card h2 { margin: 10px 0 4px; font-family: var(--serif); font-size: 23px; }
.rstars { font-size: 38px; letter-spacing: 7px; color: var(--gold); margin: 8px 0; }
.rstars .dim { color: var(--line); }
.rnums { display: flex; justify-content: center; gap: 26px; margin: 12px 0 4px; color: var(--ink-soft); font-size: 13px; }
.rnums b { display: block; font-family: var(--serif); font-size: 22px; color: var(--ink); }
.rgain { display: inline-block; background: #f6edd8; color: var(--gold); font-weight: 700; font-size: 15px; border-radius: 99px; padding: 7px 20px; margin: 10px 0; }
.rbtns { display: flex; gap: 10px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }
.wrong-review { text-align: left; margin-top: 22px; }
.wrong-review h3 { font-size: 14.5px; margin: 0 0 8px; }
.wr-item { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 10px 13px; margin-bottom: 8px; font-size: 13.5px; line-height: 1.7; }
.wr-item b { color: var(--ok); }

/* ---------- 错题本 / 报告 / 家长 ---------- */
.wtab { display: flex; gap: 7px; margin-bottom: 14px; flex-wrap: wrap; }
.chart7 { display: flex; align-items: flex-end; gap: 7px; height: 120px; padding: 10px 4px 0; }
.chart7 .cb { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 5px; height: 100%; justify-content: flex-end; }
.chart7 .bar { width: 66%; max-width: 30px; border-radius: 4px 4px 0 0; background: var(--accent); min-height: 3px; opacity: .85; }
.chart7 .cl { font-size: 11px; color: var(--ink-faint); }
.chart7 .cv { font-size: 11px; color: var(--ink-soft); font-weight: 600; }
.subbar { display: flex; align-items: center; gap: 10px; margin: 9px 0; font-size: 13.5px; }
.subbar .nm { width: 26px; height: 26px; border-radius: 5px; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 14px; font-weight: 700; color: #fff; flex: none; }
.subbar .progress { flex: 1; }
.subbar .pc { width: 92px; text-align: right; color: var(--ink-soft); font-size: 12px; }
.book-stars { display: flex; flex-wrap: wrap; gap: 8px; }
.book-stars .bs { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 7px 11px; font-size: 12.5px; display: flex; align-items: center; gap: 6px; }
.book-stars .bs .mk { width: 22px; height: 22px; border-radius: 5px; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 12px; font-weight: 700; color: #fff; }
.book-stars .bs b { color: var(--gold); }
.parent-row { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; margin: 10px 0; }
.note { font-size: 13.5px; color: var(--ink-soft); line-height: 1.85; }
.note li { margin-bottom: 5px; }
.note b { color: var(--ink); }
.card h3 { font-family: var(--serif); }
.empty-tip { text-align: center; color: var(--ink-soft); padding: 44px 10px; font-size: 15px; }
.empty-tip .em { font-size: 46px; display: block; margin-bottom: 10px; }

/* ---------- 读题按钮 ---------- */
.qhead { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.qhead .qtype { margin-bottom: 0; }
.readq {
  margin-left: auto; border: 1px solid var(--line); background: var(--card);
  color: var(--ink-soft); border-radius: 99px; padding: 4px 13px;
  font-size: 12.5px; font-weight: 600; cursor: pointer; min-height: 30px;
}
.readq:active { background: var(--accent-tint); color: var(--accent); }

/* ---------- 护眼休息提醒 ---------- */
.eye-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(43, 40, 37, 0.55);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.eye-card {
  background: var(--card); border-radius: 14px; padding: 28px 24px;
  max-width: 340px; text-align: center;
}
.eye-card .em { font-size: 52px; }
.eye-card h3 { margin: 10px 0 6px; font-family: var(--serif); font-size: 20px; }
.eye-card .btn { margin-top: 14px; }

/* ---------- 家长验证 ---------- */
.gate-q { font-family: var(--serif); font-size: 30px; font-weight: 700; margin: 14px 0 6px; letter-spacing: 1px; }
.gate-in {
  font-size: 22px; font-family: inherit; padding: 9px 12px; width: 130px;
  border: 1px solid var(--line); border-radius: 8px; text-align: center;
  background: var(--card); color: var(--ink);
}

/* ================= 响应式：平板与桌面 ================= */
@media (min-width: 620px) {
  .grid2 { grid-template-columns: 1fr 1fr; }
  .grid3, .grid4 { grid-template-columns: repeat(3, 1fr); }
  .stat-tiles { grid-template-columns: repeat(4, 1fr); }
  .qtext { font-size: 20px; }
  .qtext .big-emoji { font-size: 64px; }
}
@media (min-width: 760px) {
  /* 桌面：主导航回到顶栏 */
  .tb-inner { height: 58px; }
  #mainnav {
    position: static; flex: 1; justify-content: flex-start;
    background: none; border: none; padding: 0; gap: 2px; overflow-x: auto;
  }
  #mainnav a { flex: none; font-size: 15px; padding: 8px 13px; border-radius: 8px; }
  #mainnav a.on { background: var(--accent-tint); }
  .logo small { display: inline; }
  #view { padding-bottom: 48px; }
  #pagefoot { padding-bottom: 30px; }
  .grid3 { grid-template-columns: repeat(3, 1fr); }
  .grid4 { grid-template-columns: repeat(4, 1fr); }
  .hero-home h1 { font-size: 30px; }
}
@media (max-width: 759px) {
  /* 移动端：隐藏 logo 副标，给底部标签栏留空间 */
  .logo small { display: none; }
}
@media (max-width: 400px) {
  .opts { grid-template-columns: 1fr; }
  .judge-btns .opt { width: 46%; }
}