/* 俄语生存系统 · 设计系统 v2 —— 商业级质感 */
:root{
  --bg:#0b0e13; --bg2:#11151c; --card:#161b23; --card2:#1e252f;
  --tx:#eef2f6; --tx2:#a7b6c5; --tx3:#6b7c8d;
  --acc:#f5b34c; --acc-d:#e89b2b; --acc2:#43d68a; --acc3:#5b9dff; --bad:#ff6b6b;
  --line:#252e3a; --ru:#ffd98a;
  --shadow:0 10px 34px rgba(0,0,0,.45);
  --r:18px;
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--tx);
  font-family:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  height:100%; overscroll-behavior:none;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility}
body{background:radial-gradient(1200px 600px at 80% -10%, rgba(245,179,76,.06), transparent 60%),
     radial-gradient(900px 500px at -10% 110%, rgba(91,157,255,.05), transparent 60%), var(--bg)}
#app{max-width:680px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column}
#topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;
  padding:14px 18px 10px;background:linear-gradient(rgba(11,14,19,.92),rgba(11,14,19,.75));backdrop-filter:blur(14px)}
.brand{font-weight:800;font-size:17px;letter-spacing:.02em}
.brand .sub{font-size:11px;color:var(--tx3);margin-left:6px;font-weight:500}
#streakChip{font-size:12px;background:linear-gradient(135deg,rgba(245,179,76,.16),rgba(245,179,76,.05));
  border:1px solid rgba(245,179,76,.35);border-radius:99px;padding:6px 13px;color:var(--acc);cursor:pointer;font-weight:600}
#view{flex:1;padding:10px 16px 110px;animation:fadein .28s ease}
@keyframes fadein{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
#tabbar{position:fixed;bottom:12px;left:50%;transform:translateX(-50%);z-index:20;display:flex;gap:2px;
  background:rgba(22,27,35,.9);backdrop-filter:blur(18px);border:1px solid var(--line);
  border-radius:22px;padding:6px;box-shadow:var(--shadow);width:min(648px,calc(100% - 24px))}
#tabbar button{flex:1;background:none;border:none;color:var(--tx3);border-radius:17px;
  display:flex;flex-direction:column;align-items:center;gap:2px;padding:9px 0 7px;cursor:pointer;
  font-family:inherit;transition:all .18s ease}
#tabbar button span{font-size:12.5px;font-weight:600}
#tabbar button.on{color:#131009;background:linear-gradient(135deg,var(--acc),var(--acc-d))}

/* ------- generic ------- */
h2.sec{font-size:12.5px;color:var(--tx3);margin:22px 6px 9px;font-weight:700;letter-spacing:.14em}
.card{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);
  border-radius:var(--r);padding:16px 18px;margin-bottom:10px;box-shadow:0 4px 18px rgba(0,0,0,.22)}
.btn{display:inline-block;background:var(--card2);border:1px solid var(--line);color:var(--tx);
  border-radius:14px;padding:11px 16px;font-size:15px;cursor:pointer;font-family:inherit;font-weight:600;
  transition:transform .12s ease, filter .12s ease}
.btn:active{transform:scale(.97)}
.btn.primary{background:linear-gradient(135deg,var(--acc),var(--acc-d));border-color:transparent;
  color:#171007;font-weight:800;box-shadow:0 6px 20px rgba(245,179,76,.25)}
.btn.green{background:linear-gradient(135deg,var(--acc2),#2ea86d);border-color:transparent;color:#04170e;font-weight:800}
.btn.ghost{background:transparent}
.btn.big{width:100%;text-align:center;font-size:15.5px;padding:14px}
.btnrow{display:flex;gap:8px;margin-top:12px}
.btnrow .btn{flex:1;text-align:center}
.ru{font-family:"Songti SC","STSong","Georgia","Times New Roman",serif;color:var(--ru);font-weight:600}
.muted{color:var(--tx2);font-size:13.5px;line-height:1.8}
.tiny{color:var(--tx3);font-size:12px}
.tag{display:inline-block;font-size:11px;background:var(--card2);border:1px solid var(--line);
  color:var(--tx2);border-radius:8px;padding:2.5px 9px;margin-right:4px}
.pill{display:inline-block;font-size:12px;font-weight:700;background:rgba(67,214,138,.12);color:var(--acc2);
  border:1px solid rgba(67,214,138,.4);border-radius:99px;padding:2.5px 10px}

/* ------- today ------- */
.statrow{display:flex;gap:8px;margin-bottom:12px}
.stat{flex:1;background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);
  border-radius:16px;padding:13px 10px 11px;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.22)}
.stat b{display:block;font-size:24px;font-weight:800;letter-spacing:-.01em}
.stat span{font-size:11px;color:var(--tx2)}
.dash-actions .btn{margin-bottom:9px}
.routine{display:flex;flex-direction:column;gap:11px}
.routine .r{display:flex;align-items:center;gap:10px;font-size:14.5px;color:var(--tx2)}
.routine .r .box{width:20px;height:20px;border-radius:7px;border:1.5px solid var(--tx3);flex:none;
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;transition:all .2s}
.routine .r.done .box{background:var(--acc2);border-color:var(--acc2);color:#04170e}
.routine .r.done{color:var(--tx3)}
.routine .r.done span:last-child{opacity:.75}

/* ------- course ------- */
.module{margin-bottom:16px}
.module>.mt{font-size:15.5px;font-weight:800;margin:0 6px 9px;line-height:1.5}
.lesson{display:flex;align-items:center;gap:13px;background:linear-gradient(180deg,var(--card),var(--bg2));
  border:1px solid var(--line);border-radius:16px;padding:13px 15px;margin-bottom:8px;cursor:pointer;
  transition:transform .12s ease}
.lesson:active{transform:scale(.985)}
.lesson .num{width:36px;height:36px;border-radius:12px;background:var(--card2);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:14px;flex:none;color:var(--acc3);font-weight:700}
.lesson .ti{flex:1;min-width:0}
.lesson .ti b{display:block;font-size:15px;margin-bottom:2px}
.lesson .ti span{font-size:12px;color:var(--tx2);display:block;line-height:1.5}

/* ------- lesson modal ------- */
#modalRoot .overlay{position:fixed;inset:0;z-index:50;background:var(--bg);display:flex;flex-direction:column;
  max-width:680px;margin:0 auto;animation:slideup .26s cubic-bezier(.2,.8,.25,1)}
@keyframes slideup{from{transform:translateY(26px);opacity:0}to{transform:none;opacity:1}}
.lm-head{display:flex;align-items:center;gap:12px;padding:14px 16px 10px}
.lm-head .x{font-size:18px;background:var(--card2);border:1px solid var(--line);color:var(--tx2);
  cursor:pointer;border-radius:11px;width:34px;height:34px;display:flex;align-items:center;justify-content:center}
.lm-bar{flex:1;height:6px;border-radius:3px;background:var(--card2);overflow:hidden}
.lm-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--acc),var(--acc-d));
  transition:width .35s cubic-bezier(.2,.8,.25,1)}
.lm-body{flex:1;overflow-y:auto;padding:16px 18px 110px}
.lm-foot{position:absolute;bottom:0;left:0;right:0;padding:14px 16px max(14px,env(safe-area-inset-bottom));
  background:linear-gradient(transparent,var(--bg) 40%);display:flex;gap:8px}
.lm-foot .btn{flex:1}
.lm-title{font-size:21px;font-weight:800;margin:6px 0 4px;letter-spacing:-.01em}
.lm-desc{color:var(--tx2);font-size:14px;margin-bottom:14px;line-height:1.7}

/* word cards */
.wcard{background:linear-gradient(160deg,var(--card2),var(--card) 55%);border:1px solid var(--line);
  border-radius:22px;padding:30px 20px;text-align:center;min-height:250px;display:flex;flex-direction:column;
  justify-content:center;box-shadow:var(--shadow);position:relative;overflow:hidden}
.wcard::before{content:"";position:absolute;top:-60px;right:-60px;width:170px;height:170px;border-radius:50%;
  background:radial-gradient(circle,rgba(245,179,76,.12),transparent 70%)}
.wcard .w{font-size:38px;line-height:1.3;letter-spacing:.01em}
.wcard .z{font-size:19px;color:var(--tx2);margin-top:14px}
.wcard .n{font-size:13px;color:var(--tx3);margin-top:10px}
.widx{font-size:12px;color:var(--tx3);margin-top:12px}

/* phrases & dialog rows */
.prow{display:flex;align-items:flex-start;gap:10px;background:linear-gradient(180deg,var(--card),var(--bg2));
  border:1px solid var(--line);border-radius:15px;padding:12px 14px;margin-bottom:8px;cursor:pointer;
  transition:transform .12s ease}
.prow:active{transform:scale(.985)}
.prow .p{flex:1;min-width:0}
.prow .p .r{font-size:17px;line-height:1.5}
.prow .p .z{font-size:13px;color:var(--tx2);margin-top:3px}
.spk{min-width:40px;height:30px;border-radius:99px;background:rgba(245,179,76,.1);border:1px solid rgba(245,179,76,.3);
  color:var(--acc);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;
  flex:none;margin-top:2px;padding:0 11px}
.dlg{display:flex;flex-direction:column;gap:9px}
.dlg .line{max-width:88%;display:flex;gap:8px;align-items:flex-end}
.dlg .line.you{align-self:flex-end;flex-direction:row-reverse}
.dlg .bub{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:10px 13px;cursor:pointer}
.dlg .you .bub{background:linear-gradient(160deg,rgba(91,157,255,.14),rgba(91,157,255,.06));border-color:rgba(91,157,255,.4)}
.dlg .bub .r{font-size:16px;line-height:1.45}
.dlg .bub .z{font-size:12px;color:var(--tx2);margin-top:3px}
.dlg .who{font-size:11px;color:var(--tx3);font-weight:700}

/* culture note */
.cult{background:linear-gradient(150deg,rgba(245,179,76,.1),rgba(245,179,76,.03));
  border:1px solid rgba(245,179,76,.35);border-radius:16px;padding:14px 16px;margin:14px 0}
.cult .t{font-size:13px;font-weight:800;color:var(--acc);margin-bottom:7px;letter-spacing:.06em}
.cult ul{margin:0;padding-left:18px;color:var(--tx2);font-size:13.5px;line-height:1.85}
.cult li{margin-bottom:2px}

/* quiz */
.qq{font-size:17px;margin:8px 2px 16px;line-height:1.6}
.opt{display:block;width:100%;text-align:left;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:14px 15px;font-size:16px;margin-bottom:9px;cursor:pointer;color:var(--tx);
  font-family:inherit;transition:transform .12s ease}
.opt:active{transform:scale(.985)}
.opt.right{border-color:var(--acc2);background:rgba(67,214,138,.1)}
.opt.wrong{border-color:var(--bad);background:rgba(255,107,107,.08)}
.opt:disabled{cursor:default}

/* speak drill */
.spkcard{text-align:center;padding:24px 14px}
.spkcard .r{font-size:27px;margin:10px 0}
.mic{min-width:170px;height:64px;border-radius:99px;border:none;
  background:linear-gradient(135deg,var(--acc3),#3d7fe0);color:#fff;font-size:16px;font-weight:800;
  margin:18px auto 6px;display:block;cursor:pointer;font-family:inherit;
  box-shadow:0 8px 26px rgba(91,157,255,.35);transition:transform .15s ease}
.mic:active{transform:scale(.97)}
.mic.rec{background:linear-gradient(135deg,var(--bad),#e04848);animation:pulse 1.1s infinite}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.04)}}
.res{font-size:15px;margin-top:12px;min-height:24px}
.res .ok{color:var(--acc2)} .res .no{color:var(--bad)}

/* review */
.cardview{background:linear-gradient(160deg,var(--card2),var(--card) 55%);border:1px solid var(--line);
  border-radius:22px;padding:34px 20px;min-height:290px;display:flex;flex-direction:column;
  justify-content:center;text-align:center;cursor:pointer;box-shadow:var(--shadow);position:relative;overflow:hidden}
.cardview::before{content:"";position:absolute;bottom:-70px;left:-50px;width:190px;height:190px;border-radius:50%;
  background:radial-gradient(circle,rgba(91,157,255,.1),transparent 70%)}
.cardview .big{font-size:34px;line-height:1.4}
.cardview .hint{font-size:12px;color:var(--tx3);margin-top:16px}
.grades{display:flex;gap:7px;margin-top:14px}
.grades button{flex:1;border-radius:13px;padding:13px 0;border:1px solid var(--line);background:var(--card2);
  color:var(--tx);font-size:14px;cursor:pointer;font-family:inherit;font-weight:600;transition:transform .12s}
.grades button:active{transform:scale(.95)}
.grades button[data-g="0"]{border-color:rgba(255,107,107,.5);color:var(--bad)}
.grades button[data-g="3"]{border-color:rgba(67,214,138,.5);color:var(--acc2)}

/* phrasebook */
.search{width:100%;background:var(--card);border:1px solid var(--line);border-radius:14px;color:var(--tx);
  padding:12px 15px;font-size:15px;margin-bottom:12px;font-family:inherit}
.emg{border:1px solid rgba(255,107,107,.5);background:rgba(255,107,107,.06);border-radius:16px}
.emg .r{color:#ffb0b0}
.bigp{position:fixed;inset:0;z-index:60;background:rgba(6,8,11,.97);display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;padding:30px;cursor:pointer;
  animation:fadein .2s ease;max-width:680px;margin:0 auto}
.bigp .r{font-size:46px;line-height:1.45;margin:22px 0}
.bigp .z{font-size:22px;color:var(--tx2)}

/* ------- AI assistant ------- */
.aichips{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}
.aichip{font-size:13px;border:1px solid var(--line);background:var(--card);color:var(--tx2);
  border-radius:99px;padding:8px 14px;cursor:pointer;font-family:inherit;font-weight:600;transition:all .15s}
.aichip.on{border-color:transparent;color:#171007;font-weight:800;
  background:linear-gradient(135deg,var(--acc),var(--acc-d))}
.aiwrap{display:flex;flex-direction:column;gap:10px;padding-bottom:6px}
.msg{max-width:88%;border-radius:16px;padding:11px 14px;font-size:15px;line-height:1.8;
  white-space:pre-wrap;word-break:break-word;animation:fadein .22s ease}
.msg.you{align-self:flex-end;background:linear-gradient(160deg,rgba(91,157,255,.16),rgba(91,157,255,.07));
  border:1px solid rgba(91,157,255,.4)}
.msg.ai{align-self:flex-start;background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line)}
.msg.hint{align-self:center;max-width:96%;background:none;border:1px dashed var(--line);color:var(--tx2);font-size:13px}
.msg.typing{color:var(--tx3);font-style:italic}
.aiinput{position:sticky;bottom:6px;display:flex;gap:8px;margin-top:12px}
.aiinput textarea{flex:1;background:var(--card);border:1px solid var(--line);border-radius:14px;
  color:var(--tx);padding:13px 15px;font-size:15px;font-family:inherit;resize:none;height:50px;
  box-shadow:0 6px 20px rgba(0,0,0,.3)}
.aiinput textarea:focus{outline:1.5px solid var(--acc)}
.ainote{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 18px;
  font-size:14px;color:var(--tx2);line-height:1.9;margin-top:14px}
.empty{text-align:center;color:var(--tx3);padding:50px 20px;font-size:14px}
.progress{height:7px;border-radius:4px;background:var(--card2);overflow:hidden;margin:8px 0}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--acc2),#2ea86d);transition:width .4s}
select,input[type=range]{accent-color:var(--acc)}
select{background:var(--card2);color:var(--tx);border:1px solid var(--line);border-radius:11px;padding:8px;font-family:inherit;max-width:100%}
.rowline{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:13px 0;font-size:14px}