:root{
  --bg:#f7f5f0;
  --surface:#ffffff;
  --surface-2:#fbfaf7;
  --ink:#20262f;
  --ink-2:#5d6673;
  --ink-3:#8a929e;
  --line:#e7e2d8;
  --line-2:#f0ece4;
  --primary:#2b5fa8;
  --primary-soft:#eaf1fb;
  --primary-deep:#1e4a86;
  --amber:#c9781a;
  --amber-soft:#fdf2e2;
  --ok:#1c8a5a;
  --ok-soft:#e7f6ee;
  --danger:#c1443c;
  --radius:14px;
  --radius-s:10px;
  --shadow:0 1px 2px rgba(32,38,47,.05), 0 8px 24px -12px rgba(32,38,47,.18);
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;font-size:inherit;color:inherit;cursor:pointer;border:0;background:none}
h1,h2,h3,h4,p{margin:0}
ul{margin:0;padding:0;list-style:none}

.app{max-width:780px;margin:0 auto;padding:0 16px 108px}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 0 12px;margin-bottom:8px;
  background:linear-gradient(var(--bg) 72%,rgba(247,245,240,0));
}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.logo{
  flex:0 0 auto;width:42px;height:42px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:var(--primary);color:#fff;
  font-weight:700;font-size:15px;letter-spacing:.02em;
  box-shadow:0 6px 14px -6px rgba(43,95,168,.7);
}
.logo em{font-style:normal;font-size:10px;opacity:.75;margin-left:1px}
.brand-text h1{font-size:16px;font-weight:650;letter-spacing:.01em}
.brand-text p{font-size:11.5px;color:var(--ink-3);line-height:1.3}
.btn-ghost{
  flex:0 0 auto;padding:7px 12px;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);
  font-size:12.5px;color:var(--ink-2);box-shadow:var(--shadow);
}

/* ---------- 通用 ---------- */
.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);
}
.sec-title{
  display:flex;align-items:baseline;justify-content:space-between;gap:8px;
  margin:22px 2px 10px;
}
.sec-title h2{font-size:14px;font-weight:650;letter-spacing:.02em}
.sec-title .sub{font-size:12px;color:var(--ink-3)}
.note{
  font-size:12.5px;color:var(--ink-2);background:var(--surface-2);
  border:1px dashed var(--line);border-radius:var(--radius-s);
  padding:10px 12px;line-height:1.65;
}
.note b{color:var(--ink);font-weight:600}
.warn-box{
  margin:14px 0 4px;padding:12px 14px;border-radius:var(--radius-s);
  background:var(--amber-soft);border:1px solid #f0dcbd;color:#7a4a10;
  font-size:12.5px;line-height:1.68;
}
.warn-box > b{display:block;font-size:13px;font-weight:650;color:#6b3f0c;margin-bottom:5px}
.warn-box p{margin:5px 0 0}
.warn-box code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11.5px;
  background:rgba(255,255,255,.8);border-radius:5px;padding:1px 5px;
  word-break:break-all;
}
.warn-meta{color:#9a7238;font-size:11.5px;word-break:break-all}
.pill{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 9px;border-radius:999px;font-size:11.5px;
  background:var(--primary-soft);color:var(--primary);font-weight:600;
}
.pill.amber{background:var(--amber-soft);color:var(--amber)}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.plain{background:var(--surface-2);color:var(--ink-3);font-weight:500}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:11px 18px;border-radius:11px;font-size:14px;font-weight:600;
  background:var(--primary);color:#fff;transition:transform .12s,filter .12s;
}
.btn:active{transform:scale(.97)}
.btn.sec{background:var(--surface);color:var(--ink);border:1px solid var(--line)}
.btn.soft{background:var(--primary-soft);color:var(--primary)}
.btn.wide{width:100%}
.btn:disabled{opacity:.45;cursor:default}

/* ---------- 课程列表 ---------- */
.unit{margin-bottom:12px}
.unit > summary{
  list-style:none;cursor:pointer;border-radius:10px;
  margin:0 -8px 6px;padding:8px;
}
.unit > summary::-webkit-details-marker{display:none}
.unit > summary::after{content:"▾";margin-left:8px;color:var(--ink-3);font-size:12px;flex:0 0 auto}
.unit[open] > summary::after{content:"▴"}
.unit > summary:hover{background:var(--surface-2)}
.unit-desc{font-size:11.5px;color:var(--ink-3);margin:-2px 0 9px 2px;line-height:1.5}
.unit-head{
  display:flex;align-items:center;gap:10px;
  padding:6px 2px 8px;
}
.unit-head .u-no{
  font-size:11px;font-weight:700;color:var(--primary);
  background:var(--primary-soft);border-radius:6px;padding:3px 7px;letter-spacing:.04em;
}
.unit-head h3{font-size:13.5px;font-weight:650}
.unit-head .u-sub{font-size:11.5px;color:var(--ink-3);margin-left:auto}
.lesson-list{display:grid;gap:8px}
.lesson-card{
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;
  padding:13px 14px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius-s);
  transition:border-color .15s,box-shadow .15s,transform .12s;
}
.lesson-card:hover{border-color:#d5cdbe;box-shadow:var(--shadow)}
.lesson-card:active{transform:scale(.995)}
.lesson-card .no{
  flex:0 0 auto;width:30px;height:30px;border-radius:9px;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);color:var(--ink-2);
  font-size:12.5px;font-weight:700;font-variant-numeric:tabular-nums;
}
.lesson-card.done .no{background:var(--ok-soft);color:var(--ok)}
.lesson-card .meta{min-width:0;flex:1}
.lesson-card .en{font-family:var(--serif);font-size:16px;line-height:1.35}
.lesson-card .zh{font-size:12px;color:var(--ink-3);margin-top:2px}
.lesson-card .tags{flex:0 0 auto;display:flex;flex-direction:column;align-items:flex-end;gap:4px}
.lesson-card .arrow{color:var(--ink-3);font-size:16px}

/* ---------- 课文页 ---------- */
.lv-head{padding:4px 2px 12px}
.back{
  display:inline-flex;align-items:center;gap:5px;
  font-size:13px;color:var(--ink-2);padding:5px 10px;margin:0 0 12px -10px;
  border-radius:8px;
}
.back:hover{background:var(--surface-2)}
.lv-head .kicker{font-size:11.5px;color:var(--ink-3);letter-spacing:.04em;font-weight:600}
.lv-head h2{font-family:var(--serif);font-size:26px;line-height:1.25;margin:5px 0 4px}
.lv-head .zh{font-size:13.5px;color:var(--ink-2)}
.lv-focus{
  display:flex;gap:9px;align-items:flex-start;
  margin:12px 0 4px;padding:11px 13px;
  background:var(--primary-soft);border-radius:var(--radius-s);
  font-size:12.5px;line-height:1.6;color:#24487c;
}
.lv-focus b{flex:0 0 auto;font-weight:700;color:var(--primary)}

.lv-tools{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px}
.tool{
  display:inline-flex;align-items:center;gap:5px;
  padding:7px 12px;border-radius:999px;font-size:12.5px;
  background:var(--surface);border:1px solid var(--line);color:var(--ink-2);
}
.tool.on{background:var(--primary);border-color:var(--primary);color:#fff}

.lines{display:grid;gap:2px;margin-top:10px}
.lines.hidez .line .zh{visibility:hidden}
.line{
  display:flex;flex-wrap:wrap;gap:10px;align-items:flex-start;
  padding:11px 12px;border-radius:var(--radius-s);
  border:1px solid transparent;
  transition:background .15s,border-color .15s;
}
.line:hover{background:var(--surface-2);border-color:var(--line-2)}
.line.is-rec{background:var(--amber-soft);border-color:#f0dcbd}
.line.is-play{background:var(--primary-soft);border-color:#cfe0f7}
.line-main{flex:1;min-width:0}
.line .en{
  font-family:var(--serif);font-size:18.5px;line-height:1.62;
  letter-spacing:.005em;outline:none;
}
.line .en .w-hit{color:var(--ok);font-weight:600}
.line .en .w-miss{color:var(--danger);font-weight:600}
.line .zh{
  font-size:12.5px;color:var(--ink-2);margin-top:3px;
}
.line.hidez .zh{visibility:hidden}
.line-tools{flex:0 0 auto;display:flex;gap:4px;padding-top:2px}
.icon-btn{
  width:32px;height:32px;border-radius:9px;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;background:var(--surface-2);border:1px solid var(--line-2);
  transition:background .15s,border-color .15s;
}
.icon-btn:hover{background:#f2eee6}
.icon-btn.rec-on{background:#f7dddd;border-color:#eec3c3;animation:pulse 1.1s infinite}
.icon-btn.has-audio{background:var(--ok-soft);border-color:#cfe9db}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.55}}

.line-extra{
  flex:1 0 100%;margin-top:9px;padding-top:9px;
  border-top:1px dashed var(--line);
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
}
.audio-chip{
  display:inline-flex;align-items:center;gap:5px;
  padding:5px 10px;border-radius:999px;font-size:12px;
  background:var(--surface-2);border:1px solid var(--line);
}
.audio-chip.mine{background:var(--primary-soft);border-color:#cfe0f7;color:var(--primary)}
.sr-out{
  flex:1 0 100%;font-size:12px;line-height:1.7;
  background:var(--surface-2);border-radius:8px;padding:8px 10px;color:var(--ink-2);
}
.sr-out .heard{font-family:var(--serif);font-size:14px;color:var(--ink)}
/* 识别结果里的逐词着色。注意 .sr-out 不在 .line .en 里面，
   光靠上面那条 .line .en .w-hit 规则是选不中的，必须单独写 */
.sr-out .w-hit{color:var(--ok);font-weight:600}
.sr-out .w-miss{color:var(--danger);font-weight:600}
.shadow-stage .sr-out{text-align:left;margin-top:12px}

.word-chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:4px}
.wchip{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:7px 11px;border-radius:10px;
  background:var(--surface);border:1px solid var(--line);
  font-size:13px;transition:border-color .15s,background .15s;
}
.wchip:hover{border-color:#d5cdbe;background:var(--surface-2)}
.wchip .w{font-family:var(--serif);font-size:15.5px;font-weight:600}
.wchip .p{font-size:11.5px;color:var(--ink-3);font-family:var(--serif)}
.wchip .z{font-size:11.5px;color:var(--ink-2);padding-left:6px;border-left:1px solid var(--line)}
.wchip.box0{border-color:#e8d4b4}

.lv-foot{display:flex;gap:10px;margin:20px 0 6px}
.lv-mark{margin-top:14px}

/* ---------- 跟读页 ---------- */
.pick-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:8px}
.pick{
  padding:11px 10px;border-radius:var(--radius-s);text-align:left;
  background:var(--surface);border:1px solid var(--line);
}
.pick:hover{border-color:#d5cdbe}
.pick .n{font-size:11px;color:var(--ink-3);font-weight:600}
.pick .t{font-family:var(--serif);font-size:14.5px;line-height:1.35;margin-top:2px}
.pick.done{border-color:#cfe9db;background:var(--ok-soft)}

.shadow-stage{padding:20px 16px;text-align:center;margin-top:6px}
.shadow-stage .prog{font-size:12px;color:var(--ink-3);font-weight:600;letter-spacing:.04em}
.shadow-en{
  font-family:var(--serif);font-size:27px;line-height:1.5;
  margin:14px 0 8px;min-height:80px;
}
.shadow-zh{font-size:13.5px;color:var(--ink-2);min-height:20px}
.shadow-zh.hidez{visibility:hidden}
.bar{height:5px;border-radius:99px;background:var(--line-2);overflow:hidden;margin:16px 0}
.bar > i{display:block;height:100%;background:var(--primary);border-radius:99px;transition:width .3s}
.shadow-ctrl{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;margin-top:6px}
.rec-big{
  padding:13px 24px;border-radius:999px;font-size:15px;font-weight:650;
  background:var(--amber);color:#fff;box-shadow:0 8px 18px -10px rgba(201,120,26,.9);
}
.rec-big.on{background:var(--danger);animation:pulse 1.1s infinite}
.shadow-nav{display:flex;justify-content:space-between;gap:10px;margin-top:14px}
.shadow-audio{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px}

/* ---------- 单词卡 ---------- */
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:6px}
.stat{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);
  padding:12px 10px;text-align:center;
}
.stat .v{font-size:20px;font-weight:700;font-variant-numeric:tabular-nums}
.stat .k{font-size:11px;color:var(--ink-3);margin-top:1px}
.stat.hi .v{color:var(--amber)}

.flip-wrap{perspective:1200px;margin:16px 0 0}
.flip{
  position:relative;width:100%;min-height:236px;
  transform-style:preserve-3d;transition:transform .45s cubic-bezier(.4,.15,.2,1);
  cursor:pointer;
}
.flip.on{transform:rotateY(180deg)}
.face{
  position:absolute;inset:0;backface-visibility:hidden;
  border-radius:16px;border:1px solid var(--line);background:var(--surface);
  box-shadow:var(--shadow);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:24px 20px;text-align:center;
}
.face.back{transform:rotateY(180deg);background:var(--surface-2)}
.face .w-en{font-family:var(--serif);font-size:36px;line-height:1.2}
.face .w-ipa{font-family:var(--serif);font-size:15px;color:var(--ink-3);margin-top:8px}
.face .w-zh{font-size:22px;font-weight:600}
.face .w-src{font-size:11.5px;color:var(--ink-3);margin-top:auto;padding-top:14px}
.face .hint{font-size:11.5px;color:var(--ink-3);margin-top:auto;padding-top:14px}
.face .tagline{position:absolute;top:12px;left:14px;font-size:11px;color:var(--ink-3)}
.grade{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.deck-done{text-align:center;padding:34px 16px}

.wordlist .wl-lesson{border-bottom:1px solid var(--line-2)}
.wordlist .wl-lesson:last-child{border-bottom:0}
.wordlist summary{
  display:flex;align-items:center;gap:10px;padding:11px 14px;cursor:pointer;
  font-size:13px;list-style:none;
}
.wordlist summary::-webkit-details-marker{display:none}
.wordlist summary::after{content:"▾";margin-left:auto;color:var(--ink-3);font-size:12px}
.wordlist details[open] summary::after{content:"▴"}
.wordlist .wl-body{padding:0 12px 12px;display:flex;flex-wrap:wrap;gap:7px}

/* ---------- 进度页 ---------- */
.prog-card{padding:16px;margin-top:6px}
.prog-line{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.prog-line .lab{font-size:13px;color:var(--ink-2)}
.prog-line .val{font-size:15px;font-weight:700;font-variant-numeric:tabular-nums}
.meter{height:8px;border-radius:99px;background:var(--line-2);overflow:hidden;margin-top:9px}
.meter > i{display:block;height:100%;border-radius:99px;background:var(--primary);transition:width .4s}
.meter.ok > i{background:var(--ok)}
.meter.amber > i{background:var(--amber)}
.prog-block + .prog-block{margin-top:18px;padding-top:18px;border-top:1px solid var(--line-2)}
.set-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:9px 0}
.set-row .lab{font-size:13px;color:var(--ink-2);min-width:66px}
.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--line);border-radius:9px;overflow:hidden}
.seg button{padding:6px 11px;font-size:12.5px;color:var(--ink-2)}
.seg button.on{background:var(--primary);color:#fff}
select{
  font-family:inherit;font-size:12.5px;padding:7px 9px;border-radius:9px;
  border:1px solid var(--line);background:var(--surface);color:var(--ink);max-width:230px;
}
.heat{display:flex;flex-wrap:wrap;gap:5px}
.heat span{
  width:22px;height:22px;border-radius:6px;display:flex;align-items:center;justify-content:center;
  font-size:10px;background:var(--surface-2);border:1px solid var(--line-2);color:var(--ink-3);
  font-variant-numeric:tabular-nums;
}
.heat span.done{background:var(--ok-soft);border-color:#cfe9db;color:var(--ok)}
.heat span.now{border-color:var(--primary);color:var(--primary);font-weight:700}

/* ---------- 底部导航 ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  display:flex;justify-content:center;gap:0;
  padding:8px 12px calc(8px + env(safe-area-inset-bottom));
  background:rgba(247,245,240,.93);
  backdrop-filter:saturate(160%) blur(12px);
  border-top:1px solid var(--line);
}
.tab{
  flex:1 1 0;max-width:150px;
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:6px 4px;border-radius:10px;color:var(--ink-3);font-size:11px;
  transition:color .15s,background .15s;
}
.tab i{font-style:normal;font-size:17px;line-height:1}
.tab.is-on{color:var(--primary);background:var(--primary-soft);font-weight:600}

/* ---------- 提示条 ---------- */
.toast{
  position:fixed;left:50%;bottom:96px;transform:translate(-50%,14px);
  z-index:60;max-width:min(520px,calc(100vw - 32px));
  background:rgba(32,38,47,.94);color:#fff;
  font-size:13px;line-height:1.55;padding:11px 15px;border-radius:11px;
  opacity:0;pointer-events:none;transition:opacity .22s,transform .22s;
  box-shadow:0 14px 30px -12px rgba(0,0,0,.5);
}
.toast.on{opacity:1;transform:translate(-50%,0)}

@media (max-width:520px){
  .app{padding:0 12px 104px}
  .brand-text h1{font-size:15px}
  .brand-text p{display:none}
  .lv-head h2{font-size:22px}
  .line .en{font-size:17.5px}
  .shadow-en{font-size:23px}
  .face .w-en{font-size:31px}
  .stat .v{font-size:18px}
  .stat-row{grid-template-columns:repeat(2,1fr)}
}