:root{
  --bg:#f5f3ee; --panel:#fbfaf7; --ink:#16181d; --muted:#6c717c; --line:#dcd9d1;
  --accent:#2f6758; --accent-2:#dce9e2; --soft:#ece9e1; --danger:#9e4e45; --shadow:0 12px 34px rgba(24,27,32,.08);
  --radius:22px; --sidebar:250px;
}
[data-theme="dark"]{
  --bg:#0d1117; --panel:#131922; --ink:#edf1f7; --muted:#9ca6b4; --line:#27313e;
  --accent:#78b49f; --accent-2:#1c302a; --soft:#19212b; --danger:#d97b72; --shadow:0 12px 34px rgba(0,0,0,.28);
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:.01em}
button,input,select,textarea{font:inherit} button{color:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:var(--sidebar) 1fr}
.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);background:var(--panel);border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;gap:12px;align-items:center;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:var(--ink);color:var(--panel);font-weight:800;font-size:20px}.brand strong{display:block;font-size:15px}.brand small{display:block;color:var(--muted);margin-top:2px;font-size:12px}.nav{display:grid;gap:7px;margin-top:38px}.nav a{display:flex;gap:11px;align-items:center;padding:11px 12px;border-radius:12px;color:var(--muted);text-decoration:none;font-size:14px;font-weight:650}.nav a span{width:22px;text-align:center;font-size:13px}.nav a:hover,.nav a.active{background:var(--soft);color:var(--ink)}.nav a.active{box-shadow:inset 3px 0 0 var(--accent)}.sidebar-foot{margin-top:auto;display:grid;gap:12px}.mini-stat{font-size:11px;color:var(--muted)}.mini-stat span,.mini-stat b{display:block}.mini-stat b{color:var(--ink);margin-top:2px}
.main{grid-column:2;min-width:0}.topbar{height:92px;display:flex;align-items:center;justify-content:space-between;padding:18px clamp(22px,4vw,58px);border-bottom:1px solid var(--line);position:sticky;top:0;background:color-mix(in srgb,var(--bg) 90%, transparent);backdrop-filter:blur(14px);z-index:15}.topbar h1{font-size:20px;margin:2px 0 0}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--muted);font-weight:800}.top-actions{display:flex;align-items:center;gap:14px}.today{font-size:12px;color:var(--muted)}.menu-btn{display:none;border:0;background:transparent;font-size:22px}.view{padding:34px clamp(22px,4vw,58px) 70px;max-width:1500px;margin:0 auto}
.hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.6fr);gap:22px;margin-bottom:24px}.hero-copy,.hero-panel,.panel,.stat-card,.lesson,.speak-card,.quiz-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero-copy{padding:34px}.hero-copy h2{font-size:clamp(30px,4vw,56px);line-height:1.05;margin:10px 0 18px;letter-spacing:-.035em}.hero-copy p{max-width:760px;color:var(--muted);font-size:15px;line-height:1.8}.hero-panel{padding:24px;display:flex;flex-direction:column;justify-content:space-between}.hero-panel .quote{font-size:18px;line-height:1.6}.hero-panel small{color:var(--muted)}
.kicker{display:inline-flex;padding:6px 9px;border-radius:999px;background:var(--accent-2);color:var(--accent);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.primary,.secondary,.ghost,.status-btn{border:0;border-radius:11px;padding:10px 14px;cursor:pointer;font-weight:700}.primary{background:var(--ink);color:var(--panel)}.primary:hover{opacity:.88}.secondary{background:var(--accent-2);color:var(--accent)}.ghost{background:transparent;border:1px solid var(--line)}.small{padding:8px 11px;font-size:12px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:22px 0}.stat-card{padding:20px}.stat-card .label{color:var(--muted);font-size:12px}.stat-card .num{font-size:28px;font-weight:800;margin:10px 0 7px}.bar{height:7px;background:var(--soft);border-radius:999px;overflow:hidden}.bar>i{display:block;height:100%;background:var(--accent);border-radius:inherit}.stat-foot{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-top:8px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}.panel{padding:24px}.panel h3{margin:0 0 8px;font-size:17px}.panel>p,.section-head p{color:var(--muted);line-height:1.7;margin:0}.plan-list{display:grid;gap:10px;margin-top:18px}.plan-item{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--line)}.plan-item:first-child{border-top:0}.plan-dot{width:9px;height:9px;border-radius:50%;background:var(--accent)}.plan-item strong{font-size:13px}.plan-item small{display:block;color:var(--muted);margin-top:2px}.insight{padding:16px 0;border-top:1px solid var(--line)}.insight:first-of-type{border-top:0}.insight b{font-size:13px}.insight p{font-size:12px;margin-top:4px;color:var(--muted);line-height:1.6}
.section-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:20px}.section-head h2{font-size:30px;margin:0 0 6px;letter-spacing:-.025em}.controls{display:flex;flex-wrap:wrap;gap:10px}.search,.select{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:11px;padding:10px 12px;outline:none}.search{min-width:250px}.search:focus,.select:focus,textarea:focus{border-color:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.word-card{background:var(--panel);border:1px solid var(--line);border-radius:17px;padding:18px;display:flex;flex-direction:column;min-height:214px}.word-top{display:flex;justify-content:space-between;gap:12px}.word{font-size:23px;font-weight:800;letter-spacing:-.02em}.tag{font-size:10px;text-transform:uppercase;color:var(--muted);background:var(--soft);padding:5px 8px;border-radius:999px;height:fit-content}.meaning{font-size:14px;margin:8px 0;color:var(--accent);font-weight:700}.example{margin-top:auto;padding-top:18px;font-size:13px;line-height:1.7;color:var(--muted)}.card-actions{display:flex;gap:7px;margin-top:14px}.status-btn{padding:7px 9px;background:var(--soft);font-size:11px}.status-btn.active{background:var(--accent);color:#fff}.speak-btn{border:0;background:transparent;cursor:pointer;font-size:16px;color:var(--muted);padding:0 3px}.empty{padding:40px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:16px;grid-column:1/-1}.load-more{display:flex;justify-content:center;margin-top:20px}
.chunk-card .word{font-size:18px}.chunk-card .meaning{font-size:13px}.chunk-card{min-height:230px}
.grammar-intro{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:20px}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--soft);border-radius:13px;padding:15px;font-size:13px;line-height:1.8}.lesson-list{display:grid;gap:18px}.lesson{padding:26px}.lesson-head{display:flex;justify-content:space-between;gap:18px}.lesson h3{margin:0;font-size:22px}.lesson .subtitle{color:var(--muted);margin-top:7px;line-height:1.6}.pattern{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;padding:8px 10px;background:var(--soft);border-radius:10px;font-size:12px;height:fit-content}.timeline{height:100px;margin:24px 0 16px;position:relative;background:linear-gradient(to right,transparent 0,transparent 49.75%,var(--line) 49.75%,var(--line) 50.25%,transparent 50.25%);border-radius:12px}.timeline:before{content:"PAST";position:absolute;left:0;top:4px;color:var(--muted);font-size:10px}.timeline:after{content:"FUTURE";position:absolute;right:0;top:4px;color:var(--muted);font-size:10px}.now-label{position:absolute;left:50%;transform:translateX(-50%);top:4px;font-size:10px;font-weight:800}.axis{position:absolute;left:7%;right:7%;top:54px;height:2px;background:var(--ink)}.axis:after{content:"";position:absolute;right:-2px;top:-4px;border-left:8px solid var(--ink);border-top:5px solid transparent;border-bottom:5px solid transparent}.event{position:absolute;top:43px;height:22px;border-radius:999px;background:var(--accent);opacity:.92}.event.dot{width:13px;height:13px;top:48px;border-radius:50%}.event.hollow{background:transparent;border:3px solid var(--accent)}.event.dash{height:0;border-top:3px dashed var(--accent);border-radius:0;background:transparent}.connector{position:absolute;top:54px;height:2px;background:var(--accent)}.connector:after{content:"";position:absolute;right:-2px;top:-4px;border-left:8px solid var(--accent);border-top:5px solid transparent;border-bottom:5px solid transparent}.observe{position:absolute;top:34px;width:2px;height:42px;background:var(--danger)}.lesson-explain{font-size:14px;line-height:1.8;color:var(--muted)}.example-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px;margin-top:18px}.example-box{background:var(--soft);border-radius:12px;padding:13px}.example-box b{display:block;font-size:13px}.example-box span{display:block;color:var(--muted);font-size:11px;line-height:1.5;margin-top:5px}
.practice-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(300px,.9fr);gap:18px}.speak-card,.quiz-card{padding:26px}.prompt-topic{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);font-weight:800}.prompt-text{font-size:24px;line-height:1.55;font-weight:760;margin:12px 0 18px}.scaffold{display:flex;flex-wrap:wrap;gap:8px}.scaffold span{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--soft);padding:7px 9px;border-radius:9px;font-size:11px}.timer{font-size:72px;letter-spacing:-.06em;font-weight:820;margin:16px 0}.timer.running{color:var(--accent)}.transcript{width:100%;min-height:120px;margin-top:16px;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:12px;padding:12px;resize:vertical;outline:none}.quiz-word{font-size:34px;font-weight:820;margin:18px 0}.quiz-options{display:grid;gap:8px}.quiz-option{padding:11px 12px;border:1px solid var(--line);border-radius:11px;background:var(--bg);text-align:left;cursor:pointer}.quiz-option.correct{border-color:var(--accent);background:var(--accent-2)}.quiz-option.wrong{border-color:var(--danger)}.quiz-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:11px}.history{margin-top:18px;display:grid;gap:8px}.history-item{padding:11px 0;border-top:1px solid var(--line);font-size:12px}.history-item small{display:block;color:var(--muted);margin-top:4px}
.review-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.data-box{background:var(--soft);padding:14px;border-radius:13px;font-size:12px;color:var(--muted);line-height:1.7}.import-area{width:100%;min-height:140px;background:var(--bg);border:1px solid var(--line);border-radius:12px;color:var(--ink);padding:12px;resize:vertical}.danger{color:var(--danger)}
.toast{position:fixed;right:24px;bottom:24px;background:var(--ink);color:var(--panel);padding:11px 14px;border-radius:11px;box-shadow:var(--shadow);z-index:100;font-size:12px;animation:toast .25s ease}.pill{display:inline-flex;padding:5px 8px;border-radius:999px;background:var(--soft);color:var(--muted);font-size:10px}.muted{color:var(--muted)}.hidden{display:none!important}
@keyframes toast{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}
@media(max-width:1000px){:root{--sidebar:220px}.stats-grid{grid-template-columns:1fr 1fr}.hero,.grid-2,.grammar-intro,.practice-grid,.review-grid{grid-template-columns:1fr}.top-actions .today{display:none}}
@media(max-width:760px){.app-shell{display:block}.sidebar{transform:translateX(-102%);transition:.25s;box-shadow:var(--shadow)}.sidebar.open{transform:none}.main{grid-column:auto}.menu-btn{display:block}.topbar{height:78px;padding:14px 18px}.topbar .eyebrow{display:none}.topbar h1{font-size:17px}.view{padding:22px 16px 60px}.hero-copy{padding:24px}.stats-grid{grid-template-columns:1fr 1fr}.section-head{display:block}.controls{margin-top:14px}.search{min-width:0;width:100%}.cards{grid-template-columns:1fr}.lesson{padding:20px}.lesson-head{display:block}.pattern{display:inline-block;margin-top:12px}.timer{font-size:58px}.top-actions .primary{display:none}}
@media(max-width:420px){.stats-grid{grid-template-columns:1fr}.hero-copy h2{font-size:34px}.prompt-text{font-size:20px}}

/* Grammar Reflex */
.stats-grid{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.reflex-tabs{display:flex;flex-wrap:wrap;gap:8px}.reflex-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:16px}.reflex-stats>div{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px}.reflex-stats span{display:block;color:var(--muted);font-size:11px}.reflex-stats b{display:block;font-size:23px;margin-top:5px}.reflex-filter{padding:14px 16px;margin-bottom:16px}.reflex-filter{display:flex;justify-content:space-between;gap:12px;align-items:center}.reflex-filter small{color:var(--muted);line-height:1.5}.reflex-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:18px}.reflex-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}.reflex-card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.reflex-module{font-size:12px;color:var(--muted);margin-top:8px}.reflex-count{display:flex;align-items:center;justify-content:center;width:54px;height:54px;border-radius:50%;background:var(--soft);font-size:24px;font-weight:850;flex:0 0 auto}.reflex-count.late{background:var(--accent-2);color:var(--accent);font-size:13px;letter-spacing:.08em}.reflex-prompt{font-size:clamp(24px,3.3vw,42px);font-weight:820;line-height:1.35;letter-spacing:-.025em;margin:30px 0 12px}.reflex-cue{display:inline-flex;background:var(--soft);color:var(--muted);border-radius:10px;padding:8px 10px;font-size:12px}.reflex-answer{margin-top:26px;padding:18px;border-radius:14px;background:var(--accent-2)}.reflex-answer>span{display:block;color:var(--accent);font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px}.reflex-answer strong{font-size:20px;line-height:1.6}.reflex-answer small{display:block;color:var(--muted);font-size:11px;margin-top:7px}.reflex-history{margin-top:16px;color:var(--muted);font-size:11px}.grammar-map{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:14px}.grammar-module{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}.module-meta{display:flex;justify-content:space-between;gap:8px;align-items:center}.grammar-module h3{font-size:18px;margin:14px 0 7px}.grammar-module>p{color:var(--muted);font-size:12px;line-height:1.7;min-height:42px}.module-rule{font-size:12px;line-height:1.7;padding:11px;background:var(--soft);border-radius:10px;margin:12px 0}.pattern-stack{display:flex;flex-wrap:wrap;gap:6px}.pattern-stack code{font-size:10px;background:var(--soft);padding:6px 8px;border-radius:8px}.error-box{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin:14px 0;display:grid;gap:5px}.error-box b{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.error-box span{font-size:11px;line-height:1.5}.chain-steps{display:grid;gap:9px;margin-top:20px}.chain-steps>div{display:flex;align-items:center;gap:10px;background:var(--soft);border-radius:11px;padding:10px 12px}.chain-steps b{display:flex;width:24px;height:24px;border-radius:50%;align-items:center;justify-content:center;background:var(--panel);font-size:11px}.chain-steps span{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}.chain-model{font-size:16px!important;font-weight:650!important}.chain-model .speak-btn{vertical-align:middle}
@media(max-width:1000px){.reflex-layout{grid-template-columns:1fr}.reflex-filter{display:block}.reflex-filter small{display:block;margin-top:10px}}
@media(max-width:760px){.reflex-stats{grid-template-columns:1fr 1fr}.reflex-tabs{margin-top:14px}.reflex-card{padding:20px}.reflex-prompt{font-size:27px}.grammar-map{grid-template-columns:1fr}}

/* Exam Grammar Bridge */
.exam-principle{display:grid;grid-template-columns:minmax(0,.9fr) minmax(360px,1.1fr);gap:22px;align-items:center;margin-bottom:18px}.exam-principle h3{font-size:24px;margin:12px 0 8px}.exam-principle p{font-size:13px}.bridge-flow{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;padding:18px;background:var(--soft);border-radius:14px}.bridge-flow b{font-size:12px;padding:8px 10px;border-radius:9px;background:var(--panel);border:1px solid var(--line)}.bridge-flow span{color:var(--muted)}
.exam-module>p{min-height:0}.bridge-pair{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin:12px 0}.bridge-pair>div{background:var(--soft);border-radius:11px;padding:12px}.bridge-pair b{display:block;font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}.bridge-pair span{display:block;font-size:12px;line-height:1.65;color:var(--muted)}
.exam-filter{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:16px}.exam-filter small{color:var(--muted);font-size:11px}.exam-layout,.cloze-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:18px}.exam-question{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}.exam-qmeta{display:flex;justify-content:space-between;gap:15px;align-items:flex-start}.exam-qmeta h3{margin:7px 0 0;font-size:20px}.exam-prompt{font-size:clamp(21px,2.7vw,34px);line-height:1.5;font-weight:780;letter-spacing:-.02em;margin:28px 0}.exam-options{display:grid;gap:9px}.exam-option{width:100%;display:flex;align-items:center;gap:10px;text-align:left;padding:12px 13px;background:var(--bg);border:1px solid var(--line);border-radius:11px;cursor:pointer;color:var(--ink)}.exam-option:hover:not(:disabled){border-color:var(--accent)}.exam-option b{display:grid;place-items:center;min-width:26px;height:26px;border-radius:8px;background:var(--soft);font-size:11px}.exam-option.selected{border-color:var(--accent);background:var(--accent-2)}.exam-option.correct{border-color:var(--accent);background:var(--accent-2)}.exam-option.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 8%, var(--panel))}.exam-option:disabled{cursor:default;opacity:1}.exam-explain{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}.trap-note{font-size:12px;line-height:1.7;padding:11px 12px;border-left:3px solid var(--danger);background:var(--soft);border-radius:0 10px 10px 0;margin-top:10px}.trap-note b{color:var(--danger)}
.cloze-text{font-size:18px;line-height:2.1;background:var(--soft);padding:20px;border-radius:14px;margin:20px 0 22px}.cloze-inline{display:inline-block;min-width:42px;padding:2px 7px;margin:0 2px;border-bottom:2px solid var(--accent);color:var(--accent);font-weight:750;line-height:1.5}.cloze-inline.ok{background:var(--accent-2);border-radius:6px}.cloze-inline.bad{color:var(--danger);border-color:var(--danger)}.cloze-questions{display:grid;gap:12px}.cloze-q{display:grid;grid-template-columns:36px 1fr;gap:10px;padding:14px 0;border-top:1px solid var(--line)}.cloze-no{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--soft);font-size:11px;font-weight:800}.exam-options.compact{grid-template-columns:repeat(2,minmax(0,1fr))}.exam-options.compact .exam-option{font-size:12px;padding:9px 10px}.cloze-explain{grid-column:2;margin-top:4px;font-size:11px;color:var(--muted);line-height:1.6}.cloze-explain b{display:block;color:var(--ink);margin-bottom:2px}.cloze-score{display:flex;align-items:center;font-size:13px;font-weight:800;color:var(--accent)}
.mistake-list{display:grid;gap:7px;margin-top:16px}.mistake-item{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:13px 0;border-top:1px solid var(--line)}.mistake-item:first-child{border-top:0}.mistake-item>div:first-child{min-width:0}.mistake-item b{font-size:13px;line-height:1.5}.mistake-item span{display:block;color:var(--muted);font-size:11px;margin-top:3px;line-height:1.5}.mistake-item>div:last-child{display:flex;align-items:center;gap:9px;flex:0 0 auto}.mistake-item strong{font-size:11px;color:var(--danger)}
@media(max-width:1000px){.exam-principle,.exam-layout,.cloze-layout{grid-template-columns:1fr}.exam-filter{display:block}.exam-filter small{display:block;margin-top:9px}}
@media(max-width:760px){.bridge-pair{grid-template-columns:1fr}.exam-question{padding:20px}.exam-prompt{font-size:23px}.exam-options.compact{grid-template-columns:1fr}.cloze-q{grid-template-columns:30px 1fr}.mistake-item{align-items:flex-start;display:grid}.mistake-item>div:last-child{justify-content:space-between}.cloze-text{font-size:16px}}