/* =========================================================
   语流 LinguaFlow — design system
   ========================================================= */
:root{
  --bg:#F5F6FB;
  --bg-2:#EEF0F8;
  --surface:#FFFFFF;
  --surface-2:#F5F6FB;
  --surface-3:#EBEEF7;
  --text:#141827;
  --text-2:#3B4157;
  --muted:#6F7790;
  --faint:#A3AABE;
  --border:#E4E7F1;
  --border-2:#D6DAE8;
  --primary:#5B5BD6;
  --primary-2:#7C6CF6;
  --primary-soft:#EDECFF;
  --accent:#FF7A59;
  --accent-soft:#FFEDE7;
  --success:#12A05C;
  --success-soft:#E4F7ED;
  --warning:#E39B0A;
  --warning-soft:#FDF3DC;
  --danger:#E0483F;
  --en:#3B82F6;
  --ja:#E4573D;
  --ko:#8B5CF6;
  --shadow-sm:0 2px 8px rgba(20,24,39,.05);
  --shadow:0 10px 30px -12px rgba(20,24,39,.16);
  --shadow-lg:0 30px 70px -30px rgba(37,42,74,.35);
  --radius:18px;
  --radius-sm:12px;
  --sidebar-w:248px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
html[data-theme="dark"]{
  --bg:#0C0E16;
  --bg-2:#0F121C;
  --surface:#151926;
  --surface-2:#1A1F2E;
  --surface-3:#222839;
  --text:#EEF0F9;
  --text-2:#C6CBDB;
  --muted:#98A0B5;
  --faint:#6C7488;
  --border:#252B3B;
  --border-2:#2E3549;
  --primary:#7B7BEE;
  --primary-2:#9A8BFF;
  --primary-soft:#22234A;
  --accent:#FF8A6B;
  --accent-soft:#3A241E;
  --success:#35C581;
  --success-soft:#122C21;
  --warning:#F0B429;
  --warning-soft:#33290F;
  --danger:#F06B62;
  --shadow-sm:0 2px 8px rgba(0,0,0,.3);
  --shadow:0 12px 34px -14px rgba(0,0,0,.7);
  --shadow-lg:0 30px 70px -30px rgba(0,0,0,.85);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -webkit-tap-highlight-color:transparent;
  transition:background .25s ease,color .25s ease;
}
h1,h2,h3,h4,p{margin:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}
ul{list-style:none;margin:0;padding:0}
svg{display:block}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--border-2);border-radius:8px}
::-webkit-scrollbar-track{background:transparent}

/* ---------- 启动开屏动画 ---------- */
.boot{position:fixed;inset:0;z-index:200;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;background:var(--bg);transition:background .25s ease}
.boot-mark{width:86px;height:86px;border-radius:24px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:grid;place-items:center;box-shadow:0 24px 60px -18px rgba(91,91,214,.55);animation:bootPop .7s cubic-bezier(.34,1.56,.64,1) both}
.boot-logo{width:44px;height:44px;border-radius:14px;background:rgba(255,255,255,0);position:relative}
.boot-logo::after{content:"";position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath d='M28 54c0-13 10-23 23-23s23 10 23 23-10 23-23 23c-3 0-6-.5-8.5-1.5L29 79l3-11A22 22 0 0 1 28 54z' fill='white' opacity='.95'/%3E%3C/svg%3E") center/contain no-repeat;filter:drop-shadow(0 4px 10px rgba(20,24,39,.25))}
.boot-word{margin-top:22px;font-size:30px;font-weight:800;letter-spacing:.14em;color:var(--text);animation:bootUp .6s cubic-bezier(.22,1,.36,1) .25s both}
.boot-sub{margin-top:8px;font-size:12px;font-weight:600;letter-spacing:.18em;color:var(--faint);animation:bootUp .6s cubic-bezier(.22,1,.36,1) .38s both}
.boot-bar{margin-top:26px;width:148px;height:4px;border-radius:99px;background:var(--border);overflow:hidden;animation:bootUp .6s ease .5s both}
.boot-bar i{display:block;height:100%;width:40%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--primary-2));animation:bootFill 1.1s cubic-bezier(.4,0,.2,1) .5s both}
.boot.hide{animation:bootOut .55s cubic-bezier(.4,0,.2,1) both;pointer-events:none}
@keyframes bootPop{0%{opacity:0;transform:scale(.4) rotate(-8deg)}60%{opacity:1}100%{opacity:1;transform:scale(1) rotate(0)}}
@keyframes bootUp{0%{opacity:0;transform:translateY(14px)}100%{opacity:1;transform:none}}
@keyframes bootFill{0%{width:0}70%{width:82%}100%{width:100%}}
@keyframes bootOut{0%{opacity:1}100%{opacity:0;transform:scale(1.04);visibility:hidden}}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(.88);opacity:.65}}

/* ---------- 页面切换与卡片进场 ---------- */
@keyframes viewIn{0%{opacity:0;transform:translateY(12px)}100%{opacity:1;transform:none}}
@keyframes riseIn{0%{opacity:0;transform:translateY(16px) scale(.985)}100%{opacity:1;transform:none}}
.content{animation:viewIn .42s cubic-bezier(.22,1,.36,1) both}
.stats-row>*,.grid-dash>*,.practice-grid>*,.feat-grid>*,.lang-cards>*,.dl-grid>*,.achv-grid>*,.rank-list>*,.feed-list>*{animation:riseIn .55s cubic-bezier(.22,1,.36,1) both}
.stats-row>:nth-child(2),.grid-dash>:nth-child(2),.practice-grid>:nth-child(2),.feat-grid>:nth-child(2),.lang-cards>:nth-child(2){animation-delay:.06s}
.stats-row>:nth-child(3),.grid-dash>:nth-child(3),.practice-grid>:nth-child(3),.feat-grid>:nth-child(3),.lang-cards>:nth-child(3){animation-delay:.12s}
.stats-row>:nth-child(4),.grid-dash>:nth-child(4),.practice-grid>:nth-child(4),.feat-grid>:nth-child(4),.lang-cards>:nth-child(4){animation-delay:.18s}
.grid-dash>:nth-child(5),.feat-grid>:nth-child(5),.lang-cards>:nth-child(5){animation-delay:.24s}
.grid-dash>:nth-child(6),.feat-grid>:nth-child(6),.lang-cards>:nth-child(6){animation-delay:.3s}
@media (prefers-reduced-motion:reduce){
  .boot,.boot-mark,.boot-word,.boot-sub,.boot-bar,.boot-bar i{animation:none}
  .content,.stats-row>*,.grid-dash>*,.practice-grid>*,.feat-grid>*,.lang-cards>*,.dl-grid>*,.achv-grid>*,.rank-list>*,.feed-list>*{animation:none}
}

/* ---------- shared ---------- */
.wrap{width:min(1180px,calc(100% - 48px));margin:0 auto}
.grad-text{background:linear-gradient(100deg,var(--primary),var(--primary-2) 55%,var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 20px;border-radius:999px;font-weight:600;font-size:14.5px;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 10px 24px -10px rgba(91,91,214,.75)}
.btn-primary:hover{box-shadow:0 14px 30px -10px rgba(91,91,214,.8);transform:translateY(-1px)}
.btn-accent{background:linear-gradient(135deg,#FF8A5B,#FF6B5B);color:#fff;box-shadow:0 10px 24px -10px rgba(255,107,91,.7)}
.btn-ghost{background:var(--surface);color:var(--text-2);border:1px solid var(--border-2)}
.btn-ghost:hover{background:var(--surface-2);border-color:var(--primary)}
.btn-soft{background:var(--primary-soft);color:var(--primary)}
.btn-soft:hover{filter:brightness(.97)}
.btn-lg{height:52px;padding:0 28px;font-size:15px}
.btn-sm{height:34px;padding:0 14px;font-size:13px}
.btn-block{width:100%}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.pill{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 12px;border-radius:999px;font-size:12.5px;font-weight:600;background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}
.pill svg{width:15px;height:15px}
.pill-primary{background:var(--primary-soft);color:var(--primary);border-color:transparent}
.pill-success{background:var(--success-soft);color:var(--success);border-color:transparent}
.pill-warning{background:var(--warning-soft);color:var(--warning);border-color:transparent}
.pill-accent{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.section-title{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:18px}
.section-title h2{font-size:22px;letter-spacing:-.02em}
.section-title p{color:var(--muted);font-size:13.5px;margin-top:2px}
.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary)}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.mono{font-variant-numeric:tabular-nums}
.avat{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;color:#fff;font-weight:700;font-size:14px;flex:none;overflow:hidden;position:relative}
.avat::after{content:"";position:absolute;inset:0;background:linear-gradient(160deg,rgba(255,255,255,.28),transparent 60%)}
.lang-badge{display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:40px;padding:0 8px;border-radius:12px;font-weight:800;font-size:12px;letter-spacing:.02em;color:#fff}
.lang-badge.en{background:linear-gradient(135deg,#60A5FA,#3B82F6)}
.lang-badge.ja{background:linear-gradient(135deg,#F4836A,#E4573D)}
.lang-badge.ko{background:linear-gradient(135deg,#A78BFA,#8B5CF6)}
.lang-badge.lg{min-width:52px;height:52px;border-radius:16px;font-size:15px}

/* ---------- landing ---------- */
.landing{overflow:hidden}
.land-nav{position:sticky;top:0;z-index:40;backdrop-filter:blur(16px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid transparent;transition:border-color .2s}
.land-nav.scrolled{border-bottom-color:var(--border)}
.land-nav .wrap{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em;font-size:17px}
.brand-mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:grid;place-items:center;box-shadow:0 8px 18px -8px rgba(91,91,214,.8)}
.brand-mark svg{width:20px;height:20px;stroke:#fff}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.12em;text-transform:uppercase}
.land-links{display:flex;align-items:center;gap:30px;font-size:14px;color:var(--muted);font-weight:500}
.land-links a:hover{color:var(--text)}
.land-actions{display:flex;align-items:center;gap:10px}
.land-actions .btn{height:40px}

.hero{position:relative;padding:64px 0 40px}
.hero::before{content:"";position:absolute;width:520px;height:520px;right:-140px;top:-220px;background:radial-gradient(circle,rgba(124,108,246,.22),transparent 68%);filter:blur(10px);pointer-events:none}
.hero::after{content:"";position:absolute;width:420px;height:420px;left:-180px;top:120px;background:radial-gradient(circle,rgba(255,122,89,.14),transparent 70%);pointer-events:none}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:52px;line-height:1.12;letter-spacing:-.035em;font-weight:800;margin:16px 0 20px}
.hero h1 em{font-style:normal;background:linear-gradient(100deg,var(--primary),var(--primary-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:16.5px;color:var(--muted);max-width:480px}
.hero-cta{display:flex;align-items:center;gap:14px;margin:30px 0 34px;flex-wrap:wrap}
.hero-trust{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:13px}
.hero-trust .faces{display:flex}
.hero-trust .avat{width:30px;height:30px;font-size:12px;margin-right:-9px;border:2px solid var(--bg)}
.hero-trust strong{color:var(--text)}
.hero-stats{display:flex;gap:26px;margin-top:34px;padding-top:24px;border-top:1px solid var(--border)}
.hero-stats b{font-size:22px;letter-spacing:-.02em;display:block}
.hero-stats span{font-size:12.5px;color:var(--muted)}

.hero-visual{position:relative;height:520px}
.hv-main{position:absolute;left:0;right:0;top:26px;margin:auto;width:330px;background:var(--surface);border:1px solid var(--border);border-radius:26px;box-shadow:var(--shadow-lg);padding:20px}
.hv-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.hv-head .who{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:700}
.hv-goal{display:flex;align-items:center;gap:16px;padding:16px;border-radius:16px;background:linear-gradient(135deg,#5B5BD6,#7C6CF6);margin-bottom:14px;color:#fff}
.hv-goal .ring-wrap{flex:none}
.hv-goal h4{font-size:14px;color:#fff}
.hv-goal p{font-size:12px;color:rgba(255,255,255,.78)}
.hv-flashcard{margin-top:2px;border-radius:16px;padding:16px;background:var(--surface-2);border:1px solid var(--border)}
.hv-flashcard .word{font-size:24px;font-weight:800;letter-spacing:-.02em}
.hv-flashcard .ipa{font-size:12.5px;color:var(--muted);margin-bottom:5px}
.hv-flashcard .tr{font-size:13.5px;color:var(--text-2)}
.hv-actions{display:flex;gap:8px;margin-top:14px}
.hv-actions .btn{flex:1;height:38px;font-size:13px}
.float-card{position:absolute;background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:14px 16px;display:flex;align-items:center;gap:11px;animation:float 6s ease-in-out infinite}
.float-card b{font-size:13.5px;display:block}
.float-card span{font-size:11.5px;color:var(--muted)}
.float-card .ficon{width:34px;height:34px;border-radius:11px;display:grid;place-items:center}
.float-card .ficon svg{width:18px;height:18px}
.fc-1{right:-12px;top:0;animation-delay:-1s}
.fc-2{left:-26px;top:210px;animation-delay:-3s}
.fc-3{right:-4px;bottom:58px;animation-delay:-4.5s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

.langs{padding:30px 0 10px}
.lang-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.lang-card{position:relative;overflow:hidden;padding:24px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease,border-color .25s}
.lang-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--border-2)}
.lang-card::after{content:"";position:absolute;right:-40px;top:-40px;width:140px;height:140px;border-radius:50%;background:var(--tint);opacity:.12}
.lang-card .lc-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:16px}
.lang-card h3{font-size:19px;letter-spacing:-.02em;display:flex;align-items:center;gap:8px}
.lang-card h3 span{font-size:12px;font-weight:600;color:var(--faint);letter-spacing:.06em}
.lang-card p{color:var(--muted);font-size:13.5px;min-height:42px}
.lang-levels{display:flex;gap:6px;margin:16px 0 18px}
.lang-levels .lv{flex:1;border-radius:10px;padding:8px 6px;text-align:center;background:var(--surface-2);border:1px solid var(--border)}
.lang-levels .lv b{display:block;font-size:12px;color:var(--text-2)}
.lang-levels .lv span{font-size:10.5px;color:var(--faint)}
.lang-card .lc-foot{display:flex;align-items:center;justify-content:space-between;font-size:12.5px;color:var(--muted)}
.lang-card .lc-foot a{color:var(--tint);font-weight:700;display:inline-flex;align-items:center;gap:4px}
.lang-card .lc-foot a svg{width:15px;height:15px;transition:transform .2s}
.lang-card:hover .lc-foot a svg{transform:translateX(3px)}

.features{padding:84px 0}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{padding:26px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);transition:transform .22s,border-color .22s,box-shadow .22s}
.feat:hover{transform:translateY(-4px);border-color:var(--border-2);box-shadow:var(--shadow)}
.feat .fi{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary);margin-bottom:16px}
.feat .fi svg{width:22px;height:22px}
.feat h3{font-size:16.5px;margin-bottom:8px;letter-spacing:-.01em}
.feat p{font-size:13.5px;color:var(--muted)}
.feat:nth-child(2) .fi{background:var(--accent-soft);color:var(--accent)}
.feat:nth-child(3) .fi{background:var(--success-soft);color:var(--success)}
.feat:nth-child(4) .fi{background:var(--warning-soft);color:var(--warning)}
.feat:nth-child(5) .fi{background:#EDE9FE;color:#7C3AED}
html[data-theme="dark"] .feat:nth-child(5) .fi{background:#2A1F4A;color:#B39BFF}
.feat:nth-child(6) .fi{background:#E0F2FE;color:#0284C7}
html[data-theme="dark"] .feat:nth-child(6) .fi{background:#102A3A;color:#5CC8FF}

.how{padding:40px 0 80px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:step}
.step{padding:24px;border-radius:var(--radius);border:1px dashed var(--border-2);background:transparent;position:relative}
.step .sn{width:30px;height:30px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-weight:800;font-size:13px;margin-bottom:14px}
.step h4{font-size:15px;margin-bottom:6px}
.step p{font-size:13px;color:var(--muted)}

/* 下载与安装 */
.download{padding:84px 0 20px}
.dl-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:34px}
.dl-card{background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:30px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.dl-icon{width:50px;height:50px;border-radius:16px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary)}
.dl-icon svg{width:24px;height:24px}
.dl-card h3{font-size:18px;letter-spacing:-.01em}
.dl-card p{font-size:13.5px;color:var(--muted);line-height:1.75}
.dl-card .btn{margin-top:6px}
.dl-tip{font-size:12px !important;color:var(--muted-2) !important}

.cta-band{margin:20px auto 90px;position:relative;overflow:hidden;border-radius:26px;padding:52px;background:linear-gradient(120deg,#5145CD,#6D5BF0 50%,#8B5CF6);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:30px;box-shadow:0 30px 60px -30px rgba(91,91,214,.8)}
.cta-band::after{content:"";position:absolute;width:360px;height:360px;border-radius:50%;background:rgba(255,255,255,.12);right:-90px;top:-160px}
.cta-band h2{font-size:30px;letter-spacing:-.02em;margin-bottom:8px}
.cta-band p{opacity:.85;font-size:14px}
.cta-band .btn{background:#fff;color:#4C42C8;flex:none;height:50px;padding:0 26px;position:relative;z-index:2}
.land-foot{border-top:1px solid var(--border);padding:26px 0 40px;color:var(--muted);font-size:13px}
.land-foot .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px}
.land-foot .brand{font-size:14px}
.land-foot .brand-mark{width:28px;height:28px;border-radius:9px}

/* ---------- auth ---------- */
.auth{min-height:100vh;min-height:100dvh;display:grid;grid-template-columns:1.05fr .95fr}
.auth-side{position:relative;overflow:hidden;background:linear-gradient(150deg,#4338CA,#5B5BD6 45%,#7C6CF6);color:#fff;padding:56px;display:flex;flex-direction:column;justify-content:space-between}
.auth-side::before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:rgba(255,255,255,.10);right:-120px;top:-100px}
.auth-side::after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;background:rgba(255,122,89,.28);left:-100px;bottom:-100px;filter:blur(20px)}
.auth-side .brand{color:#fff;position:relative;z-index:2}
.auth-side .brand small{color:rgba(255,255,255,.66)}
.auth-side .brand-mark{background:rgba(255,255,255,.16);box-shadow:none}
.auth-quote{position:relative;z-index:2;max-width:400px}
.auth-quote h2{font-size:34px;line-height:1.25;letter-spacing:-.03em;margin-bottom:16px}
.auth-quote p{color:rgba(255,255,255,.78);font-size:14.5px}
.auth-points{position:relative;z-index:2;display:flex;flex-direction:column;gap:14px;margin-top:32px}
.auth-points li{display:flex;align-items:center;gap:11px;font-size:13.5px;color:rgba(255,255,255,.9)}
.auth-points .tick{width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.18);display:grid;place-items:center;flex:none}
.auth-points .tick svg{width:13px;height:13px}
.auth-side-foot{position:relative;z-index:2;font-size:12.5px;color:rgba(255,255,255,.55)}
.auth-main{display:flex;align-items:center;justify-content:center;padding:48px 32px;background:var(--bg)}
.auth-box{width:100%;max-width:400px}
.auth-box .back{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);margin-bottom:30px}
.auth-box .back svg{width:15px;height:15px}
.auth-box h2{font-size:27px;letter-spacing:-.025em;margin-bottom:6px}
.auth-box .sub{color:var(--muted);font-size:13.5px;margin-bottom:26px}
.tabs{display:flex;background:var(--surface-2);padding:4px;border-radius:12px;margin-bottom:22px;border:1px solid var(--border)}
.tabs button{flex:1;height:36px;border-radius:9px;font-size:13.5px;font-weight:600;color:var(--muted)}
.tabs button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm)}
.field{margin-bottom:15px}
.field label{display:block;font-size:12.5px;font-weight:600;color:var(--text-2);margin-bottom:7px}
.input{width:100%;height:46px;padding:0 14px;border-radius:12px;border:1px solid var(--border-2);background:var(--surface);outline:none;transition:border-color .18s,box-shadow .18s;font-size:14px}
.input::placeholder{color:var(--faint)}
.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
textarea.input{height:auto;padding:12px 14px;resize:vertical;line-height:1.55}
.field-row{display:flex;gap:12px}
.field-row .field{flex:1}
.form-error{display:none;padding:10px 12px;border-radius:10px;background:var(--accent-soft);color:var(--danger);font-size:12.5px;margin-bottom:14px}
.form-error.show{display:block;animation:shake .35s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.auth-note{font-size:12px;color:var(--faint);text-align:center;margin-top:16px;line-height:1.6}
.divider{display:flex;align-items:center;gap:12px;color:var(--faint);font-size:12px;margin:20px 0}
.divider::before,.divider::after{content:"";height:1px;flex:1;background:var(--border)}

/* ---------- app shell ---------- */
.shell{display:flex;min-height:100vh;min-height:100dvh}
.sidebar{width:var(--sidebar-w);flex:none;position:fixed;inset:0 auto 0 0;background:var(--surface);border-right:1px solid var(--border);padding:22px 16px;display:flex;flex-direction:column;z-index:50;transition:transform .25s ease}
.sidebar .brand{padding:0 10px 22px}
.nav-label{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding:0 12px;margin:16px 0 8px}
.nav a{display:flex;align-items:center;gap:11px;height:40px;padding:0 12px;border-radius:11px;color:var(--muted);font-size:13.5px;font-weight:500;margin-bottom:3px;transition:background .16s,color .16s}
.nav a svg{width:19px;height:19px;flex:none;opacity:.85}
.nav a:hover{background:var(--surface-2);color:var(--text)}
.nav a.active{background:var(--primary-soft);color:var(--primary);font-weight:600}
.nav a.active svg{opacity:1}
.nav a .badge{margin-left:auto;height:20px;min-width:20px;padding:0 6px;border-radius:999px;background:var(--primary);color:#fff;font-size:11px;display:grid;place-items:center;font-weight:700}
.side-card{margin-top:auto;border-radius:14px;padding:14px;background:linear-gradient(150deg,var(--primary-soft),var(--surface-2));border:1px solid var(--border)}
.side-card .sc-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.side-card b{font-size:13px}
.side-card p{font-size:11.5px;color:var(--muted);margin-bottom:10px}
.side-foot{display:flex;align-items:center;gap:8px;margin-top:14px}
.side-foot .icon-btn{flex:1}
.main{flex:1;margin-left:var(--sidebar-w);min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:40;height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 30px;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0}
.topbar h1{font-size:19px;letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar .crumb{font-size:12px;color:var(--faint)}
.topbar-right{display:flex;align-items:center;gap:9px}
.stat-pill{display:flex;align-items:center;gap:8px;height:36px;padding:0 12px;border-radius:11px;background:var(--surface);border:1px solid var(--border)}
.stat-pill svg{width:17px;height:17px}
.stat-pill.fire svg{color:var(--accent)}
.stat-pill.bolt svg{color:var(--warning)}
.stat-pill b{font-size:13.5px;font-variant-numeric:tabular-nums}
.stat-pill span{font-size:11px;color:var(--muted)}
.avatar-btn{display:flex;align-items:center;gap:9px;padding:4px 10px 4px 4px;border-radius:12px;border:1px solid var(--border);background:var(--surface)}
.avatar-btn:hover{background:var(--surface-2)}
.avatar-btn .who{text-align:left;line-height:1.25}
.avatar-btn b{font-size:12.5px;display:block}
.avatar-btn span{font-size:10.5px;color:var(--muted)}
.icon-btn{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;color:var(--muted);background:var(--surface);border:1px solid var(--border)}
.icon-btn:hover{color:var(--text);background:var(--surface-2)}
.icon-btn svg{width:18px;height:18px}
.menu-btn{display:none}
.content{padding:26px 30px 60px;flex:1;width:100%;max-width:1320px;margin:0 auto;animation:viewIn .45s cubic-bezier(.22,1,.36,1) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* ---------- dashboard ---------- */
.grid-dash{display:grid;grid-template-columns:1.55fr 1fr;gap:20px}
.hero-card{position:relative;overflow:hidden;border-radius:22px;padding:26px 28px;background:linear-gradient(125deg,#5B5BD6,#6E5DF5 55%,#8A63F0);color:#fff;box-shadow:0 22px 44px -26px rgba(91,91,214,.85);display:flex;align-items:center;justify-content:space-between;gap:24px}
.hero-card::after{content:"";position:absolute;width:240px;height:240px;border-radius:50%;background:rgba(255,255,255,.10);right:-70px;bottom:-110px}
.hero-card::before{content:"";position:absolute;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.08);right:110px;top:-60px}
.hero-card .hc-main{position:relative;z-index:2}
.hero-card .eyebrow{color:rgba(255,255,255,.72)}
.hero-card .eyebrow::before{background:rgba(255,255,255,.72)}
.hero-card h2{font-size:26px;letter-spacing:-.02em;margin:8px 0 8px}
.hero-card p{font-size:13.5px;color:rgba(255,255,255,.78);max-width:360px}
.hero-card .hc-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.hero-card .hc-actions .btn-primary{background:#fff;color:#4B42CB;box-shadow:none}
.hero-card .hc-actions .btn-ghost{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.28)}
.goal-ring{position:relative;z-index:2;flex:none;display:flex;flex-direction:column;align-items:center;gap:6px}
.goal-ring .ring-label{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.75)}
.goal-ring .ring-sub{font-size:12px;color:rgba(255,255,255,.85)}
.ring-wrap{position:relative;display:inline-grid;place-items:center}
.ring-wrap svg{display:block}
.ring-wrap .ring-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.15}
.ring-center b{font-size:20px;font-variant-numeric:tabular-nums}
.ring-center span{font-size:10.5px;color:var(--muted);letter-spacing:.04em}

.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:20px}
.stat-card{padding:16px 18px;border-radius:16px;background:var(--surface);border:1px solid var(--border)}
.stat-card .st-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.stat-card .st-ic{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);color:var(--muted)}
.stat-card .st-ic svg{width:16px;height:16px}
.stat-card b{font-size:22px;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat-card span{display:block;font-size:12px;color:var(--muted);margin-top:1px}
.stat-card .st-delta{font-size:11px;font-weight:700;color:var(--success);background:var(--success-soft);padding:2px 7px;border-radius:6px}

.panel{padding:22px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.panel-head h3{font-size:16px;letter-spacing:-.01em}
.panel-head .link{font-size:12.5px;color:var(--primary);font-weight:600;display:inline-flex;align-items:center;gap:4px}
.panel-head .link svg{width:14px;height:14px}
.panel-sub{font-size:12.5px;color:var(--muted)}

.tasks{display:flex;flex-direction:column;gap:10px}
.task{display:flex;align-items:center;gap:13px;padding:12px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border);transition:border-color .18s,transform .18s;cursor:pointer}
.task:hover{border-color:var(--primary);transform:translateX(2px)}
.task .t-ic{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;flex:none;background:var(--primary-soft);color:var(--primary)}
.task .t-ic svg{width:19px;height:19px}
.task .t-main{flex:1;min-width:0}
.task b{font-size:13.5px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.task span{font-size:11.5px;color:var(--muted);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.task .t-go{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;color:var(--faint);flex:none}
.task .t-go svg{width:15px;height:15px}
.task:hover .t-go{color:var(--primary)}
.task-types .task:nth-child(2) .t-ic{background:var(--accent-soft);color:var(--accent)}
.task-types .task:nth-child(3) .t-ic{background:var(--success-soft);color:var(--success)}

.radar-wrap{display:flex;align-items:center;gap:18px}
.radar-wrap svg{flex:none}
.radar-legend{display:flex;flex-direction:column;gap:10px;flex:1;min-width:0}
.radar-legend li{display:flex;align-items:center;gap:8px;font-size:12.5px}
.radar-legend .dot{width:8px;height:8px;border-radius:50%;flex:none}
.radar-legend b{margin-left:auto;font-variant-numeric:tabular-nums;font-size:12.5px}

.week-chart{display:flex;align-items:flex-end;gap:10px;height:120px;padding-top:8px}
.week-chart .bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;height:100%;justify-content:flex-end}
.week-chart .bar{width:100%;max-width:26px;border-radius:8px;background:linear-gradient(180deg,var(--primary-2),var(--primary));min-height:3px;transition:height .5s ease}
.week-chart .bar-col.today .bar{background:linear-gradient(180deg,#FF9A7B,var(--accent))}
.week-chart .bar-col span{font-size:10.5px;color:var(--faint)}
.week-chart .bar-col.today span{color:var(--accent);font-weight:700}
.week-chart .bar-col b{font-size:10px;color:var(--muted);font-weight:600}

.continue-card{display:flex;align-items:center;gap:14px;padding:16px;border-radius:16px;background:var(--surface);border:1px solid var(--border);margin-bottom:12px;transition:border-color .18s,box-shadow .18s;cursor:pointer}
.continue-card:hover{border-color:var(--primary);box-shadow:var(--shadow-sm)}
.continue-card .t-main{flex:1;min-width:0}
.continue-card b{display:block;font-size:14px;margin-bottom:2px}
.continue-card .m{font-size:11.5px;color:var(--muted);margin-bottom:8px}
.progress{height:5px;border-radius:99px;background:var(--surface-3);overflow:hidden}
.progress > i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--primary-2));transition:width .5s ease}
.progress.accent > i{background:linear-gradient(90deg,var(--accent),#FF9E7B)}
.progress.success > i{background:linear-gradient(90deg,#22C55E,var(--success))}

/* ---------- courses ---------- */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px;flex-wrap:wrap}
.page-head h2{font-size:24px;letter-spacing:-.025em}
.page-head p{font-size:13.5px;color:var(--muted);margin-top:4px;max-width:560px}
.lang-tabs{display:flex;gap:8px;padding:4px;border-radius:14px;background:var(--surface);border:1px solid var(--border)}
.lang-tabs button{display:flex;align-items:center;gap:9px;height:44px;padding:0 16px;border-radius:10px;font-size:13.5px;font-weight:600;color:var(--muted)}
.lang-tabs button.active{background:var(--surface-2);color:var(--text);box-shadow:var(--shadow-sm)}
.lang-tabs button .lang-badge{min-width:28px;height:28px;border-radius:8px;font-size:10px}
.course-banner{position:relative;overflow:hidden;border-radius:22px;padding:28px 30px;margin-bottom:26px;background:var(--surface);border:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:24px}
.course-banner .cb-main{position:relative;z-index:2}
.course-banner .cb-kicker{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;color:var(--faint)}
.course-banner h2{font-size:27px;letter-spacing:-.025em;margin:8px 0 6px;display:flex;align-items:center;gap:10px}
.course-banner h2 small{font-size:13px;font-weight:500;color:var(--muted)}
.course-banner p{font-size:13.5px;color:var(--muted);max-width:540px}
.course-banner .cb-stats{display:flex;gap:24px;margin-top:18px}
.course-banner .cb-stats b{display:block;font-size:18px;letter-spacing:-.02em}
.course-banner .cb-stats span{font-size:11.5px;color:var(--muted)}
.course-banner .cb-art{position:relative;z-index:2;display:grid;place-items:center;width:130px;height:130px;border-radius:26px;background:var(--surface-2);border:1px solid var(--border);flex:none}
.course-banner .cb-art .lang-badge{min-width:70px;height:70px;border-radius:20px;font-size:19px}
.course-banner::after{content:"";position:absolute;right:140px;top:-40px;width:200px;height:200px;border-radius:50%;background:var(--tint);opacity:.10}

.level-block{margin-bottom:26px}
.level-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.level-head .lv-chip{height:28px;padding:0 10px;border-radius:8px;background:var(--primary-soft);color:var(--primary);font-weight:800;font-size:12.5px;display:grid;place-items:center;letter-spacing:.03em}
.level-head h3{font-size:17px;letter-spacing:-.01em}
.level-head .level-progress{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}
.level-head .level-progress .progress{width:110px}
.units{display:flex;flex-direction:column;gap:12px}
.unit{border-radius:16px;border:1px solid var(--border);background:var(--surface);overflow:hidden}
.unit-head{display:flex;align-items:center;gap:14px;padding:16px 18px;cursor:pointer}
.unit-head:hover{background:var(--surface-2)}
.unit-index{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);font-weight:800;font-size:13px;color:var(--muted);flex:none}
.unit-head h4{font-size:14.5px;letter-spacing:-.01em}
.unit-head .u-sub{font-size:11.5px;color:var(--muted);margin-top:1px}
.unit-meta{margin-left:auto;display:flex;align-items:center;gap:12px;flex:none}
.unit-meta .pct{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.unit-meta .chev{color:var(--faint);transition:transform .2s}
.unit-meta .chev svg{width:16px;height:16px}
.unit.open .chev{transform:rotate(180deg)}
.unit-body{display:none;padding:0 18px 16px;border-top:1px solid var(--border);background:var(--surface-2)}
.unit.open .unit-body{display:block;animation:fadeUp .25s ease}
.unit-body .unit-desc{font-size:12px;color:var(--muted);padding:12px 0 4px}
.lesson-row{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:11px;background:var(--surface);border:1px solid var(--border);margin-top:8px;cursor:pointer;transition:border-color .18s,transform .18s}
.lesson-row:hover{border-color:var(--primary);transform:translateX(2px)}
.lesson-row .l-ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary);flex:none}
.lesson-row .l-ic svg{width:17px;height:17px}
.lesson-row[data-type="grammar"] .l-ic{background:var(--accent-soft);color:var(--accent)}
.lesson-row[data-type="speaking"] .l-ic{background:var(--success-soft);color:var(--success)}
.lesson-row[data-type="listening"] .l-ic{background:var(--warning-soft);color:var(--warning)}
.lesson-row b{font-size:13.5px;display:block}
.lesson-row .l-meta{font-size:11px;color:var(--muted)}
.lesson-row .l-state{margin-left:auto;font-size:11px;color:var(--faint);display:flex;align-items:center;gap:6px;flex:none}
.lesson-row .l-state svg{width:15px;height:15px}
.lesson-row.completed .l-state{color:var(--success)}
.lesson-row.completed{background:linear-gradient(90deg,var(--success-soft),var(--surface) 60%)}
.lesson-row .l-play{width:28px;height:28px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;flex:none}
.lesson-row .l-play svg{width:14px;height:14px}

/* ---------- practice ---------- */
.practice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.prac{position:relative;overflow:hidden;padding:24px;border-radius:20px;background:var(--surface);border:1px solid var(--border);transition:transform .2s,box-shadow .2s,border-color .2s;cursor:pointer}
.prac:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--border-2)}
.prac .p-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:16px}
.prac .p-ic{width:52px;height:52px;border-radius:15px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary)}
.prac .p-ic svg{width:24px;height:24px}
.prac[data-type="grammar"] .p-ic{background:var(--accent-soft);color:var(--accent)}
.prac[data-type="speaking"] .p-ic{background:var(--success-soft);color:var(--success)}
.prac[data-type="listening"] .p-ic{background:var(--warning-soft);color:var(--warning)}
.prac h3{font-size:18px;letter-spacing:-.02em;margin-bottom:5px}
.prac p{font-size:13px;color:var(--muted);margin-bottom:16px;min-height:38px}
.prac .p-foot{display:flex;align-items:center;justify-content:space-between;gap:12px}
.prac .p-score{font-size:11.5px;color:var(--muted)}
.prac .p-score b{color:var(--text);font-variant-numeric:tabular-nums}
.prac .p-bar{margin-top:14px}
.review-band{display:flex;align-items:center;gap:16px;padding:20px 22px;margin-bottom:22px;border-radius:18px;background:linear-gradient(120deg,var(--warning-soft),var(--surface) 70%);border:1px solid var(--border)}
.review-band .rb-ic{width:46px;height:46px;border-radius:14px;background:var(--warning-soft);color:var(--warning);display:grid;place-items:center;flex:none}
.review-band .rb-ic svg{width:22px;height:22px}
.review-band .rb-main{flex:1;min-width:0}
.review-band b{font-size:14.5px;display:block}
.review-band span{font-size:12px;color:var(--muted)}

/* ---------- community ---------- */
.comm-layout{display:grid;grid-template-columns:1fr 300px;gap:20px;align-items:start}
.composer{padding:18px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);margin-bottom:16px}
.composer .c-top{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.composer textarea{width:100%;border:none;background:var(--surface-2);border-radius:12px;padding:12px 14px;resize:none;height:76px;outline:none;font-size:13.5px;border:1px solid var(--border)}
.composer textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
.composer .c-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px}
.composer select{height:34px;border-radius:9px;border:1px solid var(--border-2);background:var(--surface);padding:0 10px;font-size:12.5px;outline:none}
.composer .c-hint{font-size:11.5px;color:var(--faint)}
.feed{display:flex;flex-direction:column;gap:14px}
.post{padding:18px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);transition:border-color .2s}
.post:hover{border-color:var(--border-2)}
.post .p-head{display:flex;align-items:center;gap:11px;margin-bottom:10px}
.post .p-head .who b{font-size:13.5px;display:block;line-height:1.35}
.post .p-head .who span{font-size:11px;color:var(--faint)}
.post .p-head .lang-pill{margin-left:auto;height:28px;padding:0 9px;gap:5px}
.post .lang-pill .lang-badge{min-width:24px;height:24px;border-radius:7px;font-size:10px}
.post .p-body{font-size:13.5px;color:var(--text-2);line-height:1.7;white-space:pre-wrap;word-break:break-word}
.post .p-acts{display:flex;align-items:center;gap:6px;margin-top:13px;padding-top:12px;border-top:1px solid var(--border)}
.act{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 10px;border-radius:9px;font-size:12px;color:var(--muted)}
.act svg{width:16px;height:16px}
.act:hover{background:var(--surface-2);color:var(--text)}
.act.liked{color:var(--accent);background:var(--accent-soft)}
.act.liked svg{fill:currentColor}
.comments{margin-top:10px;padding-top:10px;border-top:1px dashed var(--border);display:flex;flex-direction:column;gap:9px}
.comment{display:flex;gap:9px;font-size:12.5px}
.comment .avat{width:26px;height:26px;font-size:10px}
.comment b{font-weight:700}
.comment p{color:var(--muted);font-size:12.5px;line-height:1.5}
.comment-form{display:flex;gap:8px;margin-top:4px}
.comment-form input{flex:1;height:34px;border-radius:9px;border:1px solid var(--border);background:var(--surface-2);padding:0 11px;font-size:12.5px;outline:none}
.comment-form input:focus{border-color:var(--primary)}
.side-panel{padding:18px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);margin-bottom:16px}
.side-panel h4{font-size:14px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.side-panel h4 svg{width:16px;height:16px;color:var(--primary)}
.rank-row{display:flex;align-items:center;gap:10px;padding:8px 0;font-size:12.5px}
.rank-row + .rank-row{border-top:1px solid var(--border)}
.rank-row .rank{width:18px;font-weight:800;color:var(--faint);font-size:12px;text-align:center;flex:none}
.rank-row .avat{width:28px;height:28px;font-size:11px}
.rank-row .r-name{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-row .r-xp{color:var(--muted);font-size:11.5px;font-variant-numeric:tabular-nums;flex:none}
.rank-row.me{background:var(--primary-soft);border-radius:9px;padding:8px;margin:0 -8px}
.rank-row.me .r-name{color:var(--primary);font-weight:700}
.rank-row:nth-child(2) .rank{color:#F5B700}
.rank-row:nth-child(3) .rank{color:#A3AABE}
.rank-row:nth-child(4) .rank{color:#C08457}
.topic-list li{display:flex;align-items:center;gap:8px;padding:7px 0;font-size:12.5px;color:var(--muted);cursor:pointer}
.topic-list li:hover{color:var(--primary)}
.topic-list .hash{color:var(--primary);font-weight:700}
.topic-list .cnt{margin-left:auto;font-size:11px;color:var(--faint)}

/* ---------- achievements ---------- */
.ach-overview{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:22px}
.ach-stat{padding:18px;border-radius:16px;background:var(--surface);border:1px solid var(--border);text-align:center}
.ach-stat b{font-size:24px;letter-spacing:-.02em;display:block}
.ach-stat span{font-size:12px;color:var(--muted)}
.badge-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.badge-card{padding:20px 16px;border-radius:18px;background:var(--surface);border:1px solid var(--border);text-align:center;transition:transform .2s,box-shadow .2s}
.badge-card.unlocked{background:linear-gradient(170deg,var(--surface),var(--surface-2))}
.badge-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.badge-medal{width:64px;height:64px;border-radius:50%;margin:0 auto 12px;display:grid;place-items:center;background:var(--surface-3);color:var(--faint);position:relative}
.badge-medal svg{width:28px;height:28px}
.badge-card.unlocked .badge-medal{background:linear-gradient(150deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 12px 24px -12px rgba(91,91,214,.9)}
.badge-card.unlocked .badge-medal::after{content:"";position:absolute;inset:-5px;border-radius:50%;border:1px solid var(--primary-soft)}
.badge-card b{font-size:13.5px;display:block;margin-bottom:3px}
.badge-card span{font-size:11.5px;color:var(--muted);display:block;min-height:32px;line-height:1.45}
.badge-card .b-status{margin-top:8px;font-size:10.5px;font-weight:700;color:var(--faint);letter-spacing:.04em;text-transform:uppercase}
.badge-card.unlocked .b-status{color:var(--success)}
.badge-card.locked{opacity:.72}
.badge-card.locked .badge-medal svg{opacity:.6}

/* ---------- profile ---------- */
.profile-head{display:flex;align-items:center;gap:20px;padding:24px;border-radius:20px;background:linear-gradient(120deg,var(--primary-soft),var(--surface) 60%);border:1px solid var(--border);margin-bottom:20px}
.profile-head .avat{width:76px;height:76px;font-size:26px;border:4px solid var(--surface);box-shadow:var(--shadow)}
.profile-head h2{font-size:23px;letter-spacing:-.02em}
.profile-head .p-mail{font-size:12.5px;color:var(--muted)}
.profile-head .p-tags{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.profile-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.setting-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--border)}
.setting-row:last-child{border-bottom:none;padding-bottom:0}
.setting-row .s-label b{font-size:13.5px;display:block}
.setting-row .s-label span{font-size:11.5px;color:var(--muted)}
.seg{display:flex;gap:3px;padding:3px;border-radius:9px;background:var(--surface-2);border:1px solid var(--border)}
.seg button{height:29px;padding:0 10px;border-radius:7px;font-size:12px;color:var(--muted);font-weight:600}
.seg button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm)}
.range{width:150px;accent-color:var(--primary)}
.switch{position:relative;width:44px;height:25px;border-radius:99px;background:var(--surface-3);border:1px solid var(--border-2);transition:background .2s}
.switch::after{content:"";position:absolute;width:19px;height:19px;border-radius:50%;background:#fff;top:2px;left:2px;transition:transform .2s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.switch.on{background:var(--primary);border-color:var(--primary)}
.switch.on::after{transform:translateX(19px)}
.lang-prefs{display:flex;flex-direction:column;gap:10px}
.lang-pref{display:flex;align-items:center;gap:12px;padding:12px;border-radius:12px;border:1px solid var(--border);background:var(--surface-2)}
.lang-pref .lp-main{flex:1}
.lang-pref b{font-size:13px;display:block}
.lang-pref span{font-size:11px;color:var(--muted)}
.lang-pref .radio{width:18px;height:18px;border-radius:50%;border:2px solid var(--border-2);position:relative;flex:none}
.lang-pref.active{border-color:var(--primary);background:var(--primary-soft)}
.lang-pref.active .radio{border-color:var(--primary);background:var(--primary)}
.lang-pref.active .radio::after{content:"";position:absolute;inset:3px;border-radius:50%;background:#fff}
.danger-zone .btn{color:var(--danger)}

/* ---------- lesson player ---------- */
.lesson-view{max-width:860px;margin:0 auto}
.lesson-top{display:flex;align-items:center;gap:16px;margin-bottom:22px}
.lesson-top .l-close{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;color:var(--muted);background:var(--surface);border:1px solid var(--border)}
.lesson-top .l-close svg{width:18px;height:18px}
.lesson-progress{flex:1}
.lesson-progress .lp-meta{display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);margin-bottom:6px}
.lesson-progress .bar{height:8px;border-radius:99px;background:var(--surface-3);overflow:hidden}
.lesson-progress .bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--primary-2));transition:width .4s ease}
.lesson-hearts{display:flex;align-items:center;gap:5px;font-size:12.5px;color:var(--muted)}
.lesson-hearts svg{width:16px;height:16px;color:var(--accent)}
.stage{background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:32px;min-height:420px;display:flex;flex-direction:column}
.stage .stage-kicker{display:flex;align-items:center;gap:8px;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;color:var(--faint);margin-bottom:18px}
.stage-kicker .k-ic{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--primary-soft);color:var(--primary)}
.stage-kicker .k-ic svg{width:14px;height:14px}
.stage h3.q-title{font-size:20px;line-height:1.45;letter-spacing:-.02em;margin-bottom:8px}
.stage .q-sub{font-size:13px;color:var(--muted);margin-bottom:22px}
.stage-body{flex:1;display:flex;flex-direction:column;justify-content:center}
.stage-foot{display:flex;align-items:center;justify-content:flex-end;gap:10px;margin-top:26px;padding-top:18px;border-top:1px solid var(--border)}
.stage-foot .hint{font-size:12px;color:var(--faint);margin-right:auto}

/* flashcard */
.flashcard{perspective:1200px;width:100%;max-width:520px;height:280px;margin:0 auto;cursor:pointer}
.flash-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,.2,.2,1)}
.flashcard.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:22px;border:1px solid var(--border);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px;text-align:center}
.flash-front{background:linear-gradient(160deg,var(--surface),var(--surface-2))}
.flash-front .fc-word{font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1.2}
.flash-front .fc-reading{font-size:15px;color:var(--muted);margin-top:6px}
.flash-front .fc-tip{position:absolute;bottom:18px;font-size:11.5px;color:var(--faint);display:flex;align-items:center;gap:6px}
.flash-front .fc-tip svg{width:14px;height:14px}
.flash-back{background:linear-gradient(160deg,var(--primary-soft),var(--surface));transform:rotateY(180deg);align-items:flex-start;text-align:left}
.flash-back .fb-meaning{font-size:26px;font-weight:800;letter-spacing:-.02em;margin-bottom:14px;color:var(--primary)}
.flash-back .fb-ex{font-size:14.5px;color:var(--text-2);line-height:1.6}
.flash-back .fb-ex-zh{font-size:12.5px;color:var(--muted);margin-top:5px}
.speak-btn{position:absolute;top:16px;right:16px;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--surface);border:1px solid var(--border);color:var(--primary);z-index:3}
.speak-btn:hover{background:var(--primary-soft)}
.speak-btn svg{width:18px;height:18px}

/* quiz */
.quiz-options{display:flex;flex-direction:column;gap:10px;max-width:600px;margin:0 auto;width:100%}
.opt{display:flex;align-items:center;gap:12px;padding:15px 16px;border-radius:14px;border:1px solid var(--border-2);background:var(--surface);font-size:14.5px;text-align:left;transition:border-color .16s,background .16s,transform .16s}
.opt:hover:not(.locked){border-color:var(--primary);background:var(--surface-2);transform:translateY(-1px)}
.opt .key{width:26px;height:26px;border-radius:8px;background:var(--surface-2);display:grid;place-items:center;font-size:11.5px;font-weight:700;color:var(--muted);flex:none}
.opt.correct{border-color:var(--success);background:var(--success-soft)}
.opt.correct .key{background:var(--success);color:#fff}
.opt.wrong{border-color:var(--danger);background:var(--accent-soft);animation:shake .3s}
.opt.wrong .key{background:var(--danger);color:#fff}
.opt.locked{pointer-events:none}
.opt .opt-icon{margin-left:auto;flex:none}
.opt .opt-icon svg{width:18px;height:18px}
.explain{display:none;max-width:600px;margin:16px auto 0;padding:13px 15px;border-radius:12px;background:var(--primary-soft);color:var(--text-2);font-size:13px;line-height:1.6}
.explain.show{display:block;animation:fadeUp .3s}
.explain b{color:var(--primary)}
.explain.wrong{background:var(--accent-soft)}
.explain.wrong b{color:var(--danger)}

/* listening */
.listen-box{display:flex;flex-direction:column;align-items:center;gap:16px;margin-bottom:24px}
.listen-play{width:88px;height:88px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;display:grid;place-items:center;box-shadow:0 16px 34px -14px rgba(91,91,214,.9);transition:transform .18s}
.listen-play:hover{transform:scale(1.05)}
.listen-play svg{width:34px;height:34px}
.listen-play.playing{animation:breathe 1.4s ease-in-out infinite}
@keyframes breathe{0%,100%{box-shadow:0 0 0 0 rgba(91,91,214,.5)}50%{box-shadow:0 0 0 18px rgba(91,91,214,0)}}
.listen-caption{font-size:12.5px;color:var(--muted);text-align:center;min-height:18px}

/* speaking */
.speak-panel{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px}
.speak-target{font-size:30px;font-weight:800;letter-spacing:-.02em;line-height:1.35}
.speak-zh{font-size:13px;color:var(--muted)}
.speak-tip{font-size:12px;color:var(--faint);background:var(--surface-2);padding:8px 14px;border-radius:99px;border:1px solid var(--border)}
.speak-actions{display:flex;align-items:center;gap:14px;margin-top:6px}
.mic-btn{width:76px;height:76px;border-radius:50%;background:var(--surface-2);border:2px solid var(--border-2);color:var(--muted);display:grid;place-items:center;transition:all .2s}
.mic-btn:hover{border-color:var(--primary);color:var(--primary)}
.mic-btn svg{width:30px;height:30px}
.mic-btn.recording{background:var(--accent);border-color:var(--accent);color:#fff;animation:micpulse 1.5s infinite}
@keyframes micpulse{0%{box-shadow:0 0 0 0 rgba(255,122,89,.5)}70%{box-shadow:0 0 0 20px rgba(255,122,89,0)}100%{box-shadow:0 0 0 0 rgba(255,122,89,0)}}
.speak-result{width:100%;max-width:540px;padding:16px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border);text-align:left}
.speak-result .sr-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.speak-result .sr-head b{font-size:13px}
.speak-result .sr-score{font-size:20px;font-weight:800;font-variant-numeric:tabular-nums}
.speak-result .sr-heard{font-size:13px;color:var(--muted);border-top:1px solid var(--border);padding-top:9px;margin-top:9px}
.speak-result .sr-heard b{color:var(--text-2);font-weight:600;display:block;margin-bottom:2px}
.speak-fallback{font-size:12px;color:var(--faint);max-width:440px}

/* result */
.result{max-width:660px;margin:0 auto;text-align:center;padding:40px 32px}
.result-badge{width:96px;height:96px;border-radius:50%;margin:0 auto 22px;display:grid;place-items:center;background:linear-gradient(140deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 20px 40px -18px rgba(91,91,214,.9);animation:pop .5s cubic-bezier(.2,1.2,.4,1)}
.result-badge svg{width:44px;height:44px}
@keyframes pop{from{transform:scale(.5);opacity:0}to{transform:scale(1);opacity:1}}
.result h2{font-size:28px;letter-spacing:-.025em;margin-bottom:8px}
.result p{color:var(--muted);font-size:13.5px;margin-bottom:26px}
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:26px}
.result-stat{padding:16px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border)}
.result-stat b{font-size:22px;display:block;letter-spacing:-.02em}
.result-stat span{font-size:11.5px;color:var(--muted)}
.result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.unlock-list{display:flex;flex-direction:column;gap:8px;margin:0 0 26px}
.unlock{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:12px;background:var(--primary-soft);font-size:12.5px;text-align:left}
.unlock .u-medal{width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;flex:none}
.unlock svg{width:16px;height:16px}

/* ---------- toast / modal / confetti ---------- */
.toast-root{position:fixed;right:24px;bottom:24px;z-index:200;display:flex;flex-direction:column;gap:10px;pointer-events:none}
.toast{display:flex;align-items:center;gap:10px;min-width:240px;max-width:360px;padding:12px 16px;border-radius:12px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);font-size:13px;animation:toastIn .3s ease;pointer-events:auto}
.toast.leaving{animation:toastOut .25s ease forwards}
.toast .t-ic{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;flex:none;background:var(--success-soft);color:var(--success)}
.toast .t-ic svg{width:15px;height:15px}
.toast.error .t-ic{background:var(--accent-soft);color:var(--danger)}
.toast.info .t-ic{background:var(--primary-soft);color:var(--primary)}
@keyframes toastIn{from{transform:translateY(14px);opacity:0}to{transform:none;opacity:1}}
@keyframes toastOut{to{transform:translateY(10px);opacity:0}}
.modal-mask{position:fixed;inset:0;z-index:150;background:rgba(12,14,22,.5);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:20px;animation:fade .2s}
.modal{width:100%;max-width:440px;background:var(--surface);border-radius:20px;padding:26px;box-shadow:var(--shadow-lg);animation:pop .25s cubic-bezier(.2,1.1,.4,1);border:1px solid var(--border)}
.modal h3{font-size:19px;letter-spacing:-.02em;margin-bottom:6px}
.modal p{font-size:13px;color:var(--muted);line-height:1.65;margin-bottom:20px}
.modal-actions{display:flex;justify-content:flex-end;gap:10px}
@keyframes fade{from{opacity:0}to{opacity:1}}
.confetti{position:fixed;inset:0;pointer-events:none;z-index:190;overflow:hidden}
.confetti i{position:absolute;width:8px;height:12px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{from{transform:translateY(-10vh) rotate(0);opacity:1}to{transform:translateY(110vh) rotate(720deg);opacity:.4}}

/* ---------- responsive ---------- */
@media (max-width:1120px){
  .hero h1{font-size:44px}
  .hero .wrap{gap:36px}
  .badge-grid{grid-template-columns:repeat(3,1fr)}
  .comm-layout{grid-template-columns:1fr}
}
@media (max-width:960px){
  :root{--sidebar-w:0px}
  .sidebar{transform:translateX(-100%);width:248px;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .menu-btn{display:grid}
  .hero .wrap{grid-template-columns:1fr;gap:20px}
  .hero-visual{height:460px;margin-top:10px}
  .hv-main{margin:26px auto 0}
  .fc-1{right:0}.fc-2{left:0}.fc-3{right:0}
  .grid-dash{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .auth{grid-template-columns:1fr}
  .auth-side{display:none}
  .profile-grid{grid-template-columns:1fr}
}
@media (max-width:760px){
  .wrap{width:calc(100% - 32px)}
  .land-links{display:none}
  .hero{padding:40px 0 20px}
  .hero h1{font-size:34px}
  .hero-sub{font-size:15px}
  .lang-cards{grid-template-columns:1fr}
  .hero-stats{gap:18px;flex-wrap:wrap}
  .hero-visual{height:420px}
  .hv-main{width:300px}
  .float-card{padding:11px 13px}
  .fc-1{right:-4px}.fc-2{left:-8px;top:190px}.fc-3{right:-4px;bottom:30px}
  .cta-band{flex-direction:column;align-items:flex-start;padding:34px 26px}
  .cta-band h2{font-size:24px}
  .dl-grid{grid-template-columns:1fr}
  .download{padding:60px 0 10px}
  .dl-card{padding:24px}
  .land-foot .wrap{flex-direction:column;align-items:flex-start}
  .content{padding:18px 16px calc(94px + env(safe-area-inset-bottom))}
  .topbar{padding:env(safe-area-inset-top) 16px 0;height:calc(60px + env(safe-area-inset-top))}
  .topbar h1{font-size:16px}
  .stat-pill span{display:none}
  .stat-pill{padding:0 9px;height:32px}
  .avatar-btn .who{display:none}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .hero-card{flex-direction:column;align-items:flex-start;padding:22px}
  .goal-ring{align-self:center}
  .hero-card h2{font-size:21px}
  .stage{padding:20px;min-height:auto}
  .flashcard{height:300px}
  .flash-front .fc-word{font-size:32px}
  .lesson-top{gap:10px}
  .practice-grid{grid-template-columns:1fr}
  .badge-grid{grid-template-columns:repeat(2,1fr)}
  .ach-overview{grid-template-columns:repeat(3,1fr);gap:8px}
  .ach-stat{padding:14px 8px}
  .ach-stat b{font-size:19px}
  .course-banner{padding:22px;flex-direction:column;align-items:flex-start}
  .course-banner .cb-art{display:none}
  .course-banner .cb-stats{gap:18px;flex-wrap:wrap}
  .lang-tabs{width:100%;overflow:auto}
  .lang-tabs button{flex:1;justify-content:center;padding:0 10px}
  .level-head{flex-wrap:wrap;gap:8px}
  .level-head .level-progress{margin-left:0;width:100%}
  .level-head .level-progress .progress{flex:1;width:auto}
  .unit-head{padding:14px}
  .unit-meta .pct{display:none}
  .speak-target{font-size:23px}
  .result-grid{gap:8px}
  .result{padding:26px 18px}
  .profile-head{flex-direction:column;align-items:flex-start;text-align:left}
  .profile-head .avat{width:60px;height:60px;font-size:21px}
  .range{width:110px}
  .toast-root{left:16px;right:16px;bottom:calc(88px + env(safe-area-inset-bottom))}
  .toast{min-width:0;max-width:none}
}
@media (max-width:420px){
  .hero h1{font-size:29px}
  .hero-visual{height:390px}
  .hv-main{width:280px;padding:16px}
  .fc-2{display:none}
  .stat-card b{font-size:19px}
  .topbar .stat-pill.bolt span{display:none}
  .seg button{padding:0 8px}
}

/* ---------- 手机端底部导航（PWA 应用式体验） ---------- */
.tabbar{display:none}
@media (max-width:760px){
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:60;
    background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
    border-top:1px solid var(--border);padding:6px 6px calc(6px + env(safe-area-inset-bottom));box-shadow:0 -8px 24px -18px rgba(20,24,39,.4)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:7px 0;border-radius:12px;
    color:var(--muted);font-size:11px;font-weight:600;letter-spacing:.01em;transition:color .16s,background .16s}
  .tabbar a svg{width:19px;height:19px}
  .tabbar a.active{color:var(--primary);background:var(--primary-soft)}
  .tabbar a:active{transform:scale(.96)}
  .sidebar{padding-bottom:calc(22px + env(safe-area-inset-bottom))}
  .land-nav .wrap{padding-left:16px;padding-right:16px}
  .land-foot{padding-bottom:calc(28px + env(safe-area-inset-bottom))}
  /* 移动端输入框至少 16px，避免 iOS 聚焦自动放大 */
  .input,textarea,select{font-size:16px}
  /* 触摸目标最小高度 */
  .btn-sm{min-height:36px}
  .act{min-height:40px}
  .icon-btn{width:38px;height:38px}
}
@media (max-width:420px){
  .tabbar a{font-size:10.5px}
  .tabbar a svg{width:18px;height:18px}
}