:root {
  --bg: #f4f6f2;
  --bg-2: #eef1ea;
  --card: #ffffff;
  --ink: #1d2a24;
  --ink-2: #3d4c44;
  --muted: #6f7f75;
  --line: #e3e8df;
  --primary: #1f6f5c;
  --primary-2: #2f8a72;
  --primary-soft: #e7f2ee;
  --accent: #e0663c;
  --accent-soft: #fdeee8;
  --gold: #c99a2e;
  --red: #c0392b;
  --blue: #2563eb;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(24, 40, 32, 0.04), 0 8px 24px rgba(24, 40, 32, 0.06);
  --shadow-sm: 0 1px 2px rgba(24, 40, 32, 0.06);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}
[data-theme="dark"] {
  --bg: #141a17;
  --bg-2: #101513;
  --card: #1c2521;
  --ink: #e8efe9;
  --ink-2: #c3d0c7;
  --muted: #8ba094;
  --line: #2b3731;
  --primary: #47b394;
  --primary-2: #5cc7a7;
  --primary-soft: #1f3129;
  --accent: #f08a5f;
  --accent-soft: #33231c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; font-size: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }
::selection { background: var(--primary-soft); }

/* ---------- 布局 ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 232px;
  flex: 0 0 232px;
  background: var(--card);
  border-right: 1px solid var(--line);
  padding: 22px 16px;
  position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; gap: 18px;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 0 6px; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(140deg, var(--primary), #3f9d80);
  color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 18px;
  box-shadow: 0 6px 14px rgba(31, 111, 92, 0.28);
}
.brand-name { font-weight: 700; font-size: 16px; letter-spacing: 0.5px; }
.brand-sub { font-size: 11px; color: var(--muted); letter-spacing: 1px; }
.nav { display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 10px; color: var(--ink-2);
  font-size: 14px; transition: background 0.15s, color 0.15s;
}
.nav-item:hover { background: var(--bg-2); }
.nav-item.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav-item .ico { width: 20px; text-align: center; font-size: 15px; }
.nav-item .badge { margin-left: auto; }
.nav-sub { font-size: 11px; color: var(--muted); letter-spacing: 1px; padding: 10px 10px 2px; }
.dots { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 8px; }
.dot { width: 9px; height: 9px; border-radius: 50%; opacity: 0.85; }
.sidebar-foot { margin-top: auto; font-size: 12px; color: var(--muted); padding: 0 6px; line-height: 1.5; }
.main { flex: 1; min-width: 0; padding: 26px 30px 60px; }
.wrap { max-width: 1080px; margin: 0 auto; }
.topbar { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-title { font-size: 26px; font-weight: 700; letter-spacing: 0.5px; margin: 0; }
.page-sub { color: var(--muted); font-size: 13px; margin-top: 4px; }
.topbar-actions { display: flex; gap: 8px; align-items: center; }

/* ---------- 通用组件 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow-sm);
}
.card.pad-lg { padding: 24px 28px; }
.card-title { font-size: 15px; font-weight: 700; margin: 0 0 4px; display: flex; align-items: center; gap: 8px; }
.card-sub { font-size: 12.5px; color: var(--muted); margin: 0 0 12px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.g-main { grid-template-columns: minmax(0, 1.75fr) minmax(0, 1fr); }
.g-side { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
.row { display: flex; align-items: center; gap: 10px; }
.between { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.wrap-f { flex-wrap: wrap; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.tiny { font-size: 11.5px; }
.bold { font-weight: 700; }
.mt8 { margin-top: 8px; } .mt12 { margin-top: 12px; } .mt16 { margin-top: 16px; } .mt24 { margin-top: 24px; }
.mb8 { margin-bottom: 8px; } .mb16 { margin-bottom: 16px; }
.hr { height: 1px; background: var(--line); margin: 14px 0; border: 0; }
.center { text-align: center; }
.hidden { display: none !important; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink-2); font-weight: 600; font-size: 14px;
  transition: 0.15s; white-space: nowrap;
}
.btn:hover { border-color: #cfd8cd; background: var(--bg-2); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(31, 111, 92, 0.22); }
.btn.primary:hover { background: var(--primary-2); border-color: var(--primary-2); }
.btn.accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { background: var(--bg-2); color: var(--ink); }
.btn.sm { padding: 6px 11px; font-size: 12.5px; border-radius: 8px; }
.btn.lg { padding: 12px 22px; font-size: 15px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.wide { width: 100%; }

.pill {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 600;
  background: var(--bg-2); color: var(--muted); border: 1px solid transparent;
}
.pill.green { background: var(--primary-soft); color: var(--primary); }
.pill.orange { background: var(--accent-soft); color: #b04a24; }
.pill.red { background: #fdeceb; color: var(--red); }
.pill.blue { background: #eaf0fe; color: var(--blue); }
.pill.gold { background: #fbf3dd; color: #8a6516; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); font-size: 12.5px; color: var(--ink-2); cursor: pointer;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.subj-badge {
  width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center;
  font-size: 12px; font-weight: 700; color: #fff; flex: 0 0 auto;
}

/* 进度条 */
.bar { height: 7px; border-radius: 99px; background: var(--bg-2); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 99px; background: var(--primary); transition: width 0.5s ease; }

/* ---------- 今日页 ---------- */
.hero {
  background: linear-gradient(135deg, #1f6f5c 0%, #2c8a70 55%, #3fa183 100%);
  color: #fff; border-radius: 20px; padding: 24px 26px; position: relative; overflow: hidden;
  box-shadow: 0 12px 30px rgba(31, 111, 92, 0.25);
}
.hero::after {
  content: ""; position: absolute; right: -60px; top: -70px; width: 260px; height: 260px;
  border-radius: 50%; background: rgba(255, 255, 255, 0.09);
}
.hero::before {
  content: ""; position: absolute; right: 80px; bottom: -110px; width: 200px; height: 200px;
  border-radius: 50%; background: rgba(255, 255, 255, 0.07);
}
.hero h2 { margin: 0 0 6px; font-size: 20px; font-weight: 700; letter-spacing: 0.5px; }
.hero p { margin: 0; opacity: 0.86; font-size: 13px; }
.hero-stats { display: flex; gap: 26px; margin-top: 18px; position: relative; z-index: 1; flex-wrap: wrap; }
.hero-stat b { font-size: 26px; font-weight: 700; line-height: 1.1; }
.hero-stat span { display: block; font-size: 11.5px; opacity: 0.8; letter-spacing: 0.5px; margin-top: 2px; }
.hero-badge { position: absolute; right: 22px; top: 20px; z-index: 1; }

.taskcard {
  display: flex; gap: 14px; align-items: flex-start; padding: 16px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--card);
  transition: 0.15s; position: relative;
}
.taskcard:hover { border-color: #c9d6cb; box-shadow: var(--shadow-sm); }
.taskcard.done { background: var(--primary-soft); border-color: #bfdccf; }
.taskcard.done .task-title { text-decoration: line-through; opacity: 0.65; }
.task-main { flex: 1; min-width: 0; }
.task-title { font-weight: 650; font-size: 15px; margin-bottom: 3px; }
.task-meta { font-size: 12.5px; color: var(--muted); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.task-steps { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.step-dot {
  font-size: 11.5px; padding: 3px 9px; border-radius: 999px;
  background: var(--bg-2); color: var(--muted); border: 1px solid transparent;
}
.step-dot.on { background: var(--primary); color: #fff; }
.check {
  width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--line);
  display: grid; place-items: center; color: transparent; flex: 0 0 auto; margin-top: 2px;
}
.taskcard.done .check { background: var(--primary); border-color: var(--primary); color: #fff; }

.ring-wrap { display: grid; place-items: center; position: relative; }
.ring-text { position: absolute; text-align: center; }
.ring-text b { font-size: 20px; display: block; line-height: 1.1; }
.ring-text span { font-size: 10.5px; color: var(--muted); }

/* ---------- 学习页 ---------- */
.lecture { font-size: 15.5px; line-height: 1.9; color: var(--ink-2); }
.lecture sup, .lecture sub, .keylist sup, .keylist sub, .q-text sup, .q-text sub, .opt sup, .opt sub, .feedback sup, .feedback sub { font-size: 0.72em; line-height: 0; }
.lecture p { margin: 0 0 14px; }
.lecture p:last-child { margin-bottom: 0; }
.lecture .hl { background: rgba(240, 196, 76, 0.34); border-radius: 3px; font-weight: 600; color: var(--ink); }
.keylist { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.keylist li { display: flex; gap: 9px; align-items: flex-start; font-size: 14px; line-height: 1.6; }
.keylist li .k { color: var(--primary); font-weight: 700; flex: 0 0 auto; }
.warnlist { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 7px; }
.warnlist li { display: flex; gap: 8px; font-size: 13.5px; color: var(--ink-2); background: var(--accent-soft); padding: 8px 11px; border-radius: 9px; }

.quiz { border-top: 1px dashed var(--line); padding-top: 16px; margin-top: 16px; }
.quiz:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.q-head { display: flex; gap: 8px; align-items: baseline; margin-bottom: 10px; }
.q-no { font-size: 12px; font-weight: 700; color: var(--primary); background: var(--primary-soft); padding: 1px 8px; border-radius: 6px; flex: 0 0 auto; }
.q-text { font-size: 15px; font-weight: 600; line-height: 1.7; }
.opt {
  display: flex; gap: 10px; align-items: flex-start; padding: 11px 13px; border: 1px solid var(--line);
  border-radius: 11px; margin-bottom: 8px; cursor: pointer; font-size: 14.5px; transition: 0.12s;
}
.opt:hover { border-color: var(--primary); background: var(--primary-soft); }
.opt .k { width: 20px; height: 20px; border-radius: 6px; background: var(--bg-2); display: grid; place-items: center; font-weight: 700; font-size: 12px; flex: 0 0 auto; margin-top: 1px; }
.opt.correct { border-color: var(--primary); background: var(--primary-soft); }
.opt.correct .k { background: var(--primary); color: #fff; }
.opt.wrong { border-color: #e0a49b; background: #fdf1ef; }
.opt.wrong .k { background: var(--red); color: #fff; }
.opt.locked { cursor: default; }
.input-line {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg); font-size: 14.5px; outline: none;
}
.input-line:focus { border-color: var(--primary); background: var(--card); }
.feedback { margin-top: 10px; padding: 11px 13px; border-radius: 10px; font-size: 13.5px; line-height: 1.7; }
.feedback.ok { background: var(--primary-soft); color: #17594a; }
.feedback.no { background: #fdf1ef; color: #8f2d21; }
[data-theme="dark"] .feedback.ok { color: #a9e6d4; }
[data-theme="dark"] .feedback.no { color: #ffb4a6; }
.feedback b { font-weight: 700; }

.selfrate { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.selfrate .btn { flex: 1; min-width: 96px; justify-content: center; }

/* 步骤条 */
.steps {
  display: flex; align-items: center; gap: 0; margin: 0 0 18px; padding: 0;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
}
.steps .s {
  flex: 1; text-align: center; font-size: 12.5px; padding: 9px 4px; color: var(--muted);
  border-right: 1px solid var(--line); position: relative;
}
.steps .s:last-child { border-right: 0; }
.steps .s.on { background: var(--primary); color: #fff; font-weight: 600; }
.steps .s.done { color: var(--primary); background: var(--primary-soft); }

/* ---------- 计划 ---------- */
.week-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; }
.day-col { border: 1px solid var(--line); border-radius: 12px; padding: 9px; background: var(--card); min-height: 132px; }
.day-col.today { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft); }
.day-col.exam { background: var(--accent-soft); border-color: #f0c8b7; }
.day-col .dc-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 6px; }
.day-col .dc-d { font-size: 11.5px; color: var(--muted); }
.day-col .dc-n { font-weight: 700; font-size: 14px; }
.mini-task {
  font-size: 11.5px; padding: 4px 6px; border-radius: 6px; background: var(--bg-2);
  margin-bottom: 4px; display: flex; gap: 4px; align-items: center; overflow: hidden; white-space: nowrap;
  text-overflow: ellipsis;
}
.mini-task i { width: 6px; height: 6px; border-radius: 50%; flex: 0 0 auto; }

.phase-track { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.phase-item {
  flex: 1; min-width: 150px; border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px;
  background: var(--card); border-left: 4px solid var(--line);
}
.phase-item.now { background: var(--primary-soft); }
.phase-item .pn { font-weight: 700; font-size: 13.5px; }
.phase-item .pd { font-size: 11px; color: var(--muted); }

/* ---------- 知识点库 ---------- */
.topic-row {
  display: flex; gap: 12px; align-items: center; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--card); transition: 0.13s;
}
.topic-row:hover { border-color: #c7d5cb; transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.topic-row .t-main { flex: 1; min-width: 0; }
.topic-row .t-title { font-weight: 600; font-size: 14.5px; }
.topic-row .t-meta { font-size: 11.5px; color: var(--muted); margin-top: 2px; display: flex; gap: 8px; flex-wrap: wrap; }
.mini-ring { width: 42px; height: 42px; flex: 0 0 auto; }

/* ---------- 报告 ---------- */
.kpi { border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; background: var(--card); }
.kpi .kv { font-size: 26px; font-weight: 700; line-height: 1.15; }
.kpi .kl { font-size: 12px; color: var(--muted); margin-top: 2px; }
.kpi .kx { font-size: 11.5px; color: var(--muted); }
.hm { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 11px); gap: 3px; }
.hm i { width: 11px; height: 11px; border-radius: 3px; background: var(--bg-2); display: block; }
.hm i.l1 { background: #cfe6dc; } .hm i.l2 { background: #8fc7b2; }
.hm i.l3 { background: #4f9f86; } .hm i.l4 { background: #1f6f5c; }
[data-theme="dark"] .hm i.l1 { background: #24443a; } [data-theme="dark"] .hm i.l2 { background: #2f6653; }
[data-theme="dark"] .hm i.l3 { background: #3f8a6f; } [data-theme="dark"] .hm i.l4 { background: #56b394; }
.legend { display: flex; align-items: center; gap: 6px; font-size: 11px; color: var(--muted); }

/* ---------- AI ---------- */
.chat { display: flex; flex-direction: column; gap: 12px; min-height: 260px; }
.msg { max-width: 86%; padding: 11px 14px; border-radius: 14px; font-size: 14.5px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.msg.me { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 5px; }
.msg.ai { align-self: flex-start; background: var(--card); border: 1px solid var(--line); border-bottom-left-radius: 5px; }
.msg.sys { align-self: center; background: var(--bg-2); color: var(--muted); font-size: 12.5px; max-width: 100%; }
.typing::after { content: "▍"; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 弹层 ---------- */
.mask {
  position: fixed; inset: 0; background: rgba(16, 26, 21, 0.42); backdrop-filter: blur(2px);
  display: grid; place-items: center; z-index: 100; padding: 20px;
}
.modal {
  background: var(--card); border-radius: 18px; padding: 24px; width: min(560px, 100%);
  max-height: 88vh; overflow: auto; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
}
.modal h3 { margin: 0 0 6px; font-size: 18px; }
.toast {
  position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%);
  background: #1d2a24; color: #fff; padding: 11px 20px; border-radius: 12px; font-size: 14px;
  z-index: 200; box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25); animation: pop 0.25s ease;
}
@keyframes pop { from { opacity: 0; transform: translate(-50%, 10px); } }

/* 计时器 */
.timer {
  display: flex; align-items: center; gap: 10px; font-variant-numeric: tabular-nums;
  font-weight: 700; font-size: 18px; color: var(--ink);
}
.timer.warn { color: var(--accent); }

/* 节奏编辑器 */
.rh-day { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin-bottom: 8px; background: var(--bg); }
.rh-day-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.rh-day-head b { width: 44px; flex: 0 0 auto; }
.rh-day-head .rh-total { flex: 1; font-size: 11.5px; color: var(--muted); }
.rh-slots { display: flex; flex-direction: column; gap: 6px; }
.rh-slot { display: grid; grid-template-columns: minmax(0, 1fr) 100px 60px 14px 138px 26px; gap: 6px; align-items: center; }
.rh-slot .input-line { padding: 6px 8px; font-size: 13px; background: var(--card); }
.rh-slot .rh-unit { font-size: 11px; color: var(--muted); text-align: center; }
.rh-slot .rh-del { padding: 4px 6px; font-size: 12px; color: var(--muted); }
@media (max-width: 880px) {
  .rh-slot { grid-template-columns: 1fr 1fr 1fr; }
  .rh-slot .rh-unit { display: none; }
  .rh-slot .rh-del { justify-self: end; }
}

/* 可视化 / 动图 */
.visual { border: 1px solid var(--line); border-radius: 14px; padding: 14px; background: linear-gradient(180deg, var(--card), var(--bg)); }
.visual svg { width: 100%; height: auto; display: block; }
.visual .cap { font-size: 12px; color: var(--muted); margin-top: 8px; line-height: 1.6; }
.visual .vt { font-size: 13px; font-weight: 700; margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.visual .play { margin-left: auto; }
@keyframes vdraw { to { stroke-dashoffset: 0; } }
@keyframes vpop { from { opacity: 0; transform: scale(.6); } to { opacity: 1; transform: scale(1); } }
@keyframes vgrow { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes vdash { to { stroke-dashoffset: -40; } }

/* 朗读高亮 */
.lecture p.speaking { background: var(--primary-soft); border-radius: 8px; box-shadow: 0 0 0 6px var(--primary-soft); transition: background .2s; }
.speak-btn.on { background: var(--primary); color: #fff; border-color: var(--primary); }
.mic-btn { padding: 9px 12px; }
.mic-btn.rec { background: var(--accent); border-color: var(--accent); color: #fff; animation: pulse 1.2s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 8px rgba(224, 102, 60, 0.18); } }

/* 结构化要点图（无配图时的兜底） */
.mm { display: flex; gap: 14px; align-items: stretch; flex-wrap: wrap; }
.mm-core {
  flex: 0 0 150px; display: grid; place-items: center; text-align: center; padding: 12px;
  border-radius: 12px; background: var(--primary); color: #fff; font-weight: 700; font-size: 13.5px; line-height: 1.5;
}
.mm-list { flex: 1; min-width: 220px; display: flex; flex-direction: column; gap: 8px; }
.mm-item {
  display: flex; gap: 9px; align-items: flex-start; font-size: 13.5px; line-height: 1.6;
  background: var(--bg); border-radius: 10px; padding: 8px 11px;
  animation: vpop .45s both;
}
.mm-n { width: 20px; height: 20px; border-radius: 6px; color: #fff; font-size: 11.5px; font-weight: 700; display: grid; place-items: center; flex: 0 0 auto; margin-top: 1px; }
@media (max-width: 880px) { .mm-core { flex: 1 1 100%; } }

/* ---------- 移动端 ---------- */
.mobile-nav { display: none; }
@media (max-width: 880px) {
  .sidebar { display: none; }
  .main { padding: 16px 14px 92px; }
  .page-title { font-size: 21px; }
  .g2, .g3, .g4, .g-main, .g-side { grid-template-columns: 1fr; }
  .week-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-stats { gap: 18px; }
  .hero-stat b { font-size: 21px; }
  .mobile-nav {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
    background: var(--card); border-top: 1px solid var(--line); padding: 6px 4px 10px;
    justify-content: space-around;
  }
  .mobile-nav a {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    font-size: 10.5px; color: var(--muted); padding: 4px 8px; border-radius: 10px;
  }
  .mobile-nav a.active { color: var(--primary); background: var(--primary-soft); }
  .mobile-nav a span:first-child { font-size: 17px; }
}
@media print {
  .sidebar, .mobile-nav, .topbar-actions, .btn { display: none !important; }
  .main { padding: 0; }
  .card { break-inside: avoid; }
}

/* ---------- 可读性：字号整体调大 ---------- */
body { font-size: 16.5px; }
.nav-item { font-size: 15px; }
.brand-name { font-size: 17px; }
.page-title { font-size: 28px; }
.page-sub { font-size: 14px; }
.card-title { font-size: 16.5px; }
.card-sub { font-size: 13.5px; }
.btn { font-size: 15px; }
.btn.sm { font-size: 13.5px; }
.btn.lg { font-size: 16px; }
.pill { font-size: 12.5px; }
.chip { font-size: 13.5px; }
.small { font-size: 13.5px; }
.tiny { font-size: 12.5px; }
.task-title { font-size: 16px; }
.task-meta { font-size: 13.5px; }
.step-dot { font-size: 12.5px; }
.hero h2 { font-size: 22px; }
.hero p { font-size: 14px; }
.hero-stat b { font-size: 28px; }
.hero-stat span { font-size: 12px; }
.lecture { font-size: 17px; }
.keylist li { font-size: 15.5px; }
.warnlist li { font-size: 15px; }
.q-text { font-size: 16.5px; }
.opt { font-size: 16px; }
.feedback { font-size: 14.5px; }
.input-line { font-size: 16px; }
.steps .s { font-size: 13.5px; }
.mini-task { font-size: 12.5px; }
.phase-item .pn { font-size: 14.5px; }
.phase-item .pd { font-size: 12px; }
.topic-row .t-title { font-size: 15.5px; }
.topic-row .t-meta { font-size: 12.5px; }
.kpi .kv { font-size: 28px; }
.kpi .kl { font-size: 13px; }
.kpi .kx { font-size: 12.5px; }
.msg { font-size: 15.5px; }
.visual .vt { font-size: 14px; }
.visual .cap { font-size: 13px; }
.mm-item { font-size: 14.5px; }
.day-col .dc-n { font-size: 15px; }
.day-col .dc-d { font-size: 12px; }
.rh-slot .input-line { font-size: 14px; }
.rh-day-head b { font-size: 15px; }

/* 单词卡 */
.word-card { background: linear-gradient(180deg, var(--card), var(--bg)); }
.wc-topic { font-size: 13px; color: var(--muted); }
.wc-head { display: flex; gap: 14px; align-items: center; margin-top: 10px; }
.wc-emoji { font-size: 46px; line-height: 1; }
.wc-big { font-size: 34px; font-weight: 800; letter-spacing: 0.5px; }
.wc-cn { font-size: 17px; color: var(--ink-2); margin-top: 2px; }
.wc-ex { margin-top: 14px; font-size: 16px; line-height: 1.8; color: var(--ink-2); background: var(--bg); border-radius: 10px; padding: 10px 12px; }
.wc-ex b { color: var(--primary); }
.wc-tip { margin-top: 10px; font-size: 12.5px; color: var(--muted); }
.qtype { display: inline-block; font-size: 12px; color: var(--primary); background: var(--primary-soft); padding: 2px 10px; border-radius: 999px; }
.qz-word { font-size: 30px; font-weight: 800; margin-top: 10px; }
.qz-cn { font-size: 20px; font-weight: 600; margin-top: 8px; }
.qz-sent { font-size: 18px; line-height: 1.8; margin-top: 10px; }

/* 词性归类 */
.pos-left { display: flex; flex-wrap: wrap; gap: 8px; min-height: 46px; }
.word-chip { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 1px; padding: 7px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); cursor: pointer; font-size: 15px; }
.word-chip .tiny { color: var(--muted); font-size: 11.5px; }
.word-chip.sel { border-color: var(--primary); background: var(--primary-soft); }
.pos-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.pos-bucket { border: 1.5px dashed var(--line); border-radius: 12px; padding: 10px; min-height: 120px; transition: 0.15s; }
.pos-bucket.pulse { border-color: var(--primary); }
.pb-head { font-size: 13.5px; font-weight: 700; margin-bottom: 8px; }
.pb-body { display: flex; flex-wrap: wrap; gap: 6px; }
.pb-chip { font-size: 13.5px; padding: 3px 9px; border-radius: 999px; background: var(--bg-2); }
.pb-chip.ok { background: var(--primary-soft); color: var(--primary); }
.pb-chip.no { background: #fdeceb; color: var(--red); }
@media (max-width: 880px) {
  .pos-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wc-big { font-size: 28px; }
  .qz-word { font-size: 26px; }
  body { font-size: 16px; }
  .page-title { font-size: 23px; }
}

/* 悬停释义 / 悬停翻译 */
.tip { position: relative; border-bottom: 1px dashed rgba(120, 140, 130, 0.55); cursor: help; }
.tip:hover::after {
  content: attr(data-tip);
  position: absolute; left: 50%; top: calc(100% + 9px); transform: translateX(-50%);
  background: #1d2a24; color: #fff; font-size: 13.5px; line-height: 1.65; font-weight: 400;
  padding: 8px 11px; border-radius: 9px; min-width: 90px; max-width: 340px; width: max-content;
  z-index: 60; box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22); white-space: normal; text-align: left;
  pointer-events: none; border: 0;
}
.tip:hover::before {
  content: ""; position: absolute; left: 50%; top: calc(100% + 3px); transform: translateX(-50%);
  border: 6px solid transparent; border-bottom-color: #1d2a24; z-index: 60; pointer-events: none;
}
.tip.tr {
  border-bottom: 0; background: var(--primary-soft); color: var(--primary);
  border-radius: 999px; padding: 1px 9px; font-size: 12.5px; font-weight: 700; margin-left: 6px;
  display: inline-block; vertical-align: middle; line-height: 1.7;
}
.tip.tr:hover::after { background: var(--primary); border-color: var(--primary); }
.tip.tr:hover::before { border-bottom-color: var(--primary); }
.ex-line { font-size: 16px; line-height: 2; }
.ex-line b { color: var(--primary); }
.zh-line { font-size: 18px; line-height: 2; font-weight: 600; }
.speak-mini { border: 0; background: var(--bg-2); border-radius: 8px; padding: 3px 8px; cursor: pointer; font-size: 14px; line-height: 1.4; }
.speak-mini:hover { background: var(--primary-soft); }

/* 触屏/键盘也能看释义 */
.tip:focus { outline: none; }
.tip:focus::after,
.tip:focus-visible::after {
  content: attr(data-tip);
  position: absolute; left: 50%; top: calc(100% + 9px); transform: translateX(-50%);
  background: #1d2a24; color: #fff; font-size: 13.5px; line-height: 1.65; font-weight: 400;
  padding: 8px 11px; border-radius: 9px; min-width: 90px; max-width: 340px; width: max-content;
  z-index: 60; box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22); white-space: normal; text-align: left;
  pointer-events: none; border: 0;
}

/* 词性速记 */
.drill-pic { display: flex; gap: 14px; align-items: center; background: var(--bg); border-radius: 12px; padding: 12px 14px; margin-top: 12px; }
.dp-emoji { font-size: 52px; line-height: 1; flex: 0 0 auto; }
.dp-word { font-size: 21px; font-weight: 800; }
.dp-cn { font-size: 15.5px; color: var(--ink-2); margin-top: 2px; }
@media (max-width: 880px) { .dp-emoji { font-size: 40px; } .dp-word { font-size: 19px; } }

/* 错题本里的选项 */
.wrong-opts { display: flex; flex-direction: column; gap: 6px; }
.wrong-opts .wo { display: flex; gap: 8px; font-size: 14.5px; color: var(--ink-2); background: var(--bg); border-radius: 8px; padding: 6px 10px; }
.wrong-opts .wo .k { width: 20px; height: 20px; border-radius: 6px; background: var(--bg-2); display: grid; place-items: center; font-size: 12px; font-weight: 700; flex: 0 0 auto; }

/* 存储不可用提示 */
.storage-warn {
  background: #fdf1ef; color: #8f2d21; border-bottom: 1px solid #f0c8b7;
  padding: 10px 16px; font-size: 13px; line-height: 1.6; position: sticky; top: 0; z-index: 40;
}
.storage-warn b { font-weight: 700; }