:root{
  --bg:#fffaf7;--panel:#fff;--text:#241d1a;--muted:#6f625c;--line:#eadfd9;
  --red:#b42318;--red2:#c43227;--soft:#fff0eb;--soft2:#fff7f4;--green:#15803d;
  --shadow:0 16px 44px rgba(82,45,31,.09);--radius:24px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Be Vietnam Pro","Segoe UI",Arial,sans-serif;background:linear-gradient(180deg,#fffdfb 0,#fff8f4 100%);color:var(--text);font-size:15px}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(180,35,24,.22);outline-offset:2px}button:disabled{cursor:not-allowed}
.app-shell{display:grid;grid-template-columns:258px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:rgba(255,255,255,.94);backdrop-filter:blur(18px);border-right:1px solid var(--line);padding:22px 16px;display:flex;flex-direction:column;gap:20px}.brand{display:flex;align-items:center;gap:11px;padding:0 8px}.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--red),#d65b4a);color:#fff;display:grid;place-items:center;font-weight:800;box-shadow:0 9px 20px rgba(180,35,24,.22)}.brand strong{display:block;font-size:15px}.brand span,.student-mini span,.side-ai span{display:block;color:var(--muted);font-size:11px;margin-top:3px;line-height:1.35}.student-mini{background:var(--soft2);border:1px solid #f0dcd4;border-radius:18px;padding:11px;display:flex;align-items:center;gap:9px}.student-mini .avatar,.avatar-btn{width:36px;height:36px;border-radius:12px;border:0;background:#27201d;color:#fff;display:grid;place-items:center;font-size:12px;font-weight:700}.student-mini div:nth-child(2){flex:1}.student-mini strong{font-size:13px}.sidebar nav{display:flex;flex-direction:column;gap:5px}.sidebar nav button{display:flex;align-items:center;gap:11px;border:0;background:transparent;color:#5c514c;padding:11px 12px;border-radius:14px;text-align:left;font-size:13px;font-weight:650;min-height:44px}.sidebar nav button:hover,.sidebar nav button.active{background:var(--soft);color:var(--red)}.side-ai{margin-top:auto;background:#27201d;color:#fff;border-radius:18px;padding:13px;display:flex;align-items:flex-start;gap:9px}.side-ai strong{font-size:12px}.side-ai span{color:#e7d9d2}.side-ai svg{color:#ffd0c2;flex:none}.main{min-width:0}.topbar{height:96px;padding:24px 34px 16px;display:flex;align-items:center;justify-content:space-between}.eyebrow,.section-kicker{font-size:10px;font-weight:800;letter-spacing:.15em;color:var(--red)}.topbar h1{margin:4px 0 0;font-size:26px;letter-spacing:-.04em}.top-actions{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.status-dot{width:8px;height:8px;background:#16a34a;border-radius:50%;box-shadow:0 0 0 4px #dcfce7}.avatar-btn{margin-left:8px}.error-banner{margin:0 34px 12px;background:#fff1f0;color:#8d1d14;border:1px solid #f1c3bd;border-radius:14px;padding:11px 14px;font-size:13px;font-weight:600}
.content-grid,.quiz-layout{padding:8px 34px 42px}.content-grid{display:grid;gap:20px}.page-grid{align-content:start}.page-intro{padding:10px 2px 4px}.page-intro h2{font-size:29px;line-height:1.2;letter-spacing:-.04em;margin:7px 0 8px}.page-intro p{max-width:720px;color:var(--muted);font-size:14px;line-height:1.7;margin:0}.hero-card{min-height:315px;border-radius:32px;background:radial-gradient(circle at 80% 25%,#ffd9cf 0,transparent 35%),linear-gradient(135deg,#2c1f1b 0,#4a2520 52%,#a82b23 135%);color:#fff;display:grid;grid-template-columns:1.25fr 1fr;overflow:hidden;box-shadow:var(--shadow)}.hero-copy{padding:38px 42px}.pill{display:inline-flex;align-items:center;gap:6px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:7px 10px;font-size:11px;font-weight:700}.pill.neutral{background:#f7eee9;border-color:#e5d4cd;color:#5e4b43}.hero-copy h2{font-size:37px;line-height:1.15;margin:18px 0 12px;letter-spacing:-.05em}.hero-copy h2 em{font-style:normal;color:#ffd0c1}.hero-copy p{max-width:570px;color:#f0dfda;font-size:14px;line-height:1.75}.primary,.secondary{border:0;border-radius:14px;padding:12px 17px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:750;font-size:13px;min-height:44px}.primary{background:linear-gradient(135deg,var(--red),#c9493c);color:#fff;box-shadow:0 10px 20px rgba(180,35,24,.2)}.hero-copy .primary{margin-top:8px;background:#fff;color:#352521;box-shadow:none}.primary:disabled{opacity:.55}.secondary{background:#f4ece7;color:#45352f}.full{width:100%;margin-top:16px}.hero-visual{position:relative;min-height:315px;display:grid;place-items:center}.brain-card{width:190px;height:190px;border-radius:38px;background:rgba(255,255,255,.94);color:#4a2b25;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;box-shadow:0 25px 60px rgba(20,8,5,.26);transform:rotate(3deg);z-index:2}.brain-card svg{color:var(--red)}.brain-card strong{font-size:15px}.brain-card span{font-size:11px;color:var(--muted)}.orbit{position:absolute;border:1px solid rgba(255,255,255,.22);border-radius:50%}.orbit1{width:300px;height:300px}.orbit2{width:240px;height:240px}.float-chip{position:absolute;z-index:3;background:#fff;color:#49322c;border-radius:13px;padding:9px 11px;display:flex;align-items:center;gap:7px;font-size:11px;font-weight:700;box-shadow:0 10px 30px rgba(36,15,10,.2)}.chip1{left:10%;top:25%}.chip2{right:8%;bottom:23%}.float-chip svg{color:var(--red)}
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat-card{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:16px;display:flex;gap:11px;align-items:center;min-width:0}.stat-icon,.icon-bubble,.history-icon{width:42px;height:42px;border-radius:13px;background:var(--soft);color:var(--red);display:grid;place-items:center;flex:none}.stat-card div:last-child{display:grid;min-width:0}.stat-card span{color:var(--muted);font-size:11px}.stat-card strong{font-size:20px;margin-top:2px}.stat-card small{font-size:10px;color:#7d6f68;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.two-col{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}.panel{background:rgba(255,255,255,.96);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 10px 30px rgba(103,62,44,.04)}.panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:18px}.panel-head h3{margin:5px 0 0;font-size:17px;letter-spacing:-.025em}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.form-grid label{display:grid;gap:6px;font-size:12px;color:var(--muted);font-weight:700}.form-grid .wide{grid-column:1/-1}.form-grid input,.form-grid select{width:100%;border:1px solid #dfd0c9;background:#fffaf8;color:#3b312d;padding:11px 12px;border-radius:12px;outline:none;font-size:13px;min-height:44px}.form-grid input:focus,.form-grid select:focus{border-color:#cd8176;box-shadow:0 0 0 3px #fff0eb}.preset-list{display:grid;gap:9px}.preset-list button{width:100%;border:1px solid var(--line);background:#fffdfa;border-radius:16px;padding:11px;display:flex;align-items:center;gap:10px;text-align:left;min-height:67px}.preset-list button:hover{border-color:#dba79c;background:#fff7f4}.subject-icon{width:44px;height:44px;border-radius:14px;background:#2c211e;color:#fff;display:grid;place-items:center;font-size:12px;font-weight:800;flex:none}.preset-list button div:nth-child(2){display:grid;gap:2px;flex:1}.preset-list strong{font-size:13px}.preset-list span{font-size:12px;color:#62534d}.preset-list small{font-size:10px;color:#81716a}.preset-list svg{color:var(--red);flex:none}.text-btn,.back-btn{border:0;background:none;color:var(--red);display:flex;align-items:center;gap:4px;font-size:12px;font-weight:700;padding:6px}.back-btn{padding:0;margin-bottom:10px}.history-list{display:grid;gap:10px}.history-item{display:flex;align-items:center;gap:12px;border-top:1px solid #f0e7e2;padding-top:12px;min-width:0}.history-item:first-child{border-top:0;padding-top:0}.grow{display:grid;flex:1;min-width:0}.grow strong{font-size:13px}.grow span{font-size:11px;color:var(--muted);margin-top:3px;line-height:1.5}.grow small{font-size:10px;color:#8d5149;margin-top:4px;line-height:1.4}.score{font-size:17px;font-weight:800;white-space:nowrap}.score small{font-size:10px;color:var(--muted)}.empty{min-height:130px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#877871;gap:6px;text-align:center}.empty.compact{min-height:160px}.empty strong{font-size:13px;color:#5b4f49}.empty span{font-size:11px}
.quiz-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px}.quiz-main{padding:26px}.quiz-head{display:flex;justify-content:space-between;align-items:center;gap:18px;padding-bottom:22px;border-bottom:1px solid var(--line)}.quiz-head h2{font-size:24px;margin:10px 0 8px}.quiz-head p{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:12px;margin:0}.demo-notice{margin-top:10px;max-width:650px;background:#fff6dc;border:1px solid #ead797;color:#66520a;border-radius:10px;padding:8px 10px;font-size:11px;line-height:1.5}.progress-ring{width:78px;height:78px;border-radius:50%;border:7px solid #f6d7cf;display:flex;flex-direction:column;align-items:center;justify-content:center;flex:none}.progress-ring strong{font-size:16px}.progress-ring span{font-size:10px;color:var(--muted)}.question-list{display:grid;gap:16px;margin-top:20px}.question{border:1px solid var(--line);border-radius:20px;padding:20px;background:#fff}.question.correct{border-color:#a7dfb9;background:#fbfffc}.question.wrong{border-color:#efc0b8;background:#fffdfc}.q-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.q-top>span{font-size:12px;font-weight:800;color:var(--red)}.q-top div{display:flex;gap:5px;flex-wrap:wrap;justify-content:flex-end}.q-top small{font-size:10px;background:#f7f0ec;color:#64544d;border-radius:999px;padding:5px 7px}.question h4{font-size:16px;line-height:1.65;margin:14px 0}.options{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}.options button{border:1px solid #dfd1ca;background:#fffaf8;border-radius:13px;padding:11px 12px;display:flex;align-items:center;gap:10px;text-align:left;color:#493d37;font-size:13px;min-height:50px}.options button:hover:not(:disabled){border-color:#d6978c;background:#fff5f1}.options button>span{width:28px;height:28px;border-radius:8px;background:#fff;border:1px solid #dfd1ca;display:grid;place-items:center;font-weight:800;font-size:11px;flex:none}.options button>b{font-weight:550;flex:1}.options button.selected{border-color:#c45d50;background:#fff0eb}.options button.selected>span{background:var(--red);border-color:var(--red);color:#fff}.options button.answer{border-color:#66bd82;background:#f1fff5}.options button.answer>svg{margin-left:auto;color:#15803d}.options button.bad{border-color:#d97466;background:#fff1ee}.options button.bad>svg{margin-left:auto;color:#b42318}.explain{margin-top:11px;background:#f8f4f1;border-radius:12px;padding:11px;display:flex;gap:8px;color:#5d4f49}.explain svg{color:var(--red);flex:none}.explain div{display:grid}.explain strong{font-size:11px}.explain span{font-size:12px;line-height:1.6;margin-top:2px}.submit{width:100%;margin-top:18px;padding:14px}.quiz-side .sticky{position:sticky;top:20px}.mini-progress{height:8px;background:#eee3de;border-radius:999px;overflow:hidden;margin:15px 0 8px}.mini-progress>div,.skill-meter>div{height:100%;background:linear-gradient(90deg,var(--red),#d86a59);border-radius:999px;transition:.3s}.quiz-side h3{font-size:17px;margin:6px 0}.quiz-side p{font-size:12px;color:var(--muted);line-height:1.65}.ai-report{margin-top:16px;padding:14px;border-radius:16px;background:linear-gradient(180deg,#fff4f0,#fffaf8);border:1px solid #efd6ce}.report-title{display:flex;align-items:center;gap:6px;color:var(--red);font-size:12px;font-weight:800}.ai-report strong{display:block;font-size:11px;margin-top:10px}.ai-report ul{padding-left:18px;margin:5px 0}.ai-report li{font-size:11px;color:#67564e;margin:4px 0;line-height:1.45}.loading-note{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);margin-top:12px}
.skill-list{display:grid;gap:14px}.skill-row{display:grid;grid-template-columns:minmax(150px,1fr) minmax(120px,2fr) 48px;gap:12px;align-items:center}.skill-row>div:first-child{display:grid}.skill-row strong{font-size:12px}.skill-row span{font-size:10px;color:var(--muted);margin-top:2px}.skill-row b{font-size:12px;text-align:right}.skill-meter{height:8px;background:#eee5e0;border-radius:999px;overflow:hidden}.insight-card{background:linear-gradient(145deg,#2c211e,#4f3029);color:#fff}.insight-card svg{color:#ffd0c2}.insight-card h3{font-size:20px;margin:14px 0 8px}.insight-card p{color:#eadbd5;font-size:13px;line-height:1.75}.profile-hero{display:flex;align-items:center;gap:16px}.profile-avatar{width:68px;height:68px;border-radius:22px;background:linear-gradient(135deg,#2c211e,#7d3d32);color:#fff;display:grid;place-items:center;font-size:18px;font-weight:800}.profile-hero h3{margin:0 0 5px;font-size:18px}.profile-hero p{margin:0;color:var(--muted);font-size:12px}.settings-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.setting-item{display:flex;align-items:center;gap:13px}.setting-item>svg{color:var(--red);flex:none}.setting-item>div{display:grid;flex:1}.setting-item strong{font-size:13px}.setting-item span{font-size:11px;color:var(--muted);margin-top:4px;line-height:1.5}.setting-item.danger{grid-column:1/-1}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:1050px){.sidebar{width:82px;padding:20px 10px}.app-shell{grid-template-columns:82px 1fr}.brand div:last-child,.student-mini div:nth-child(2),.student-mini svg,.sidebar nav span,.side-ai div{display:none}.brand{justify-content:center}.student-mini{justify-content:center}.sidebar nav button{justify-content:center}.side-ai{justify-content:center}.stats-row{grid-template-columns:repeat(2,1fr)}.hero-card{grid-template-columns:1fr}.hero-visual{display:none}.quiz-layout{grid-template-columns:minmax(0,1fr) 280px}}
@media(max-width:760px){body{font-size:14px}.app-shell{display:block}.sidebar{position:fixed;z-index:20;bottom:0;top:auto;width:100%;height:76px;border-right:0;border-top:1px solid var(--line);padding:7px 6px;background:rgba(255,255,255,.98);display:block;overflow-x:auto}.brand,.student-mini,.side-ai{display:none}.sidebar nav{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:2px;min-width:0}.sidebar nav button{padding:7px 4px;display:grid;place-items:center;gap:3px;font-size:12px;min-height:60px}.sidebar nav button span{display:block;font-size:0;white-space:nowrap}.sidebar nav button span::after{content:attr(data-short);font-size:10px}.main{padding-bottom:78px}.topbar{height:78px;padding:16px 16px 10px}.topbar h1{font-size:21px}.eyebrow{font-size:9px}.top-actions{font-size:0}.error-banner{margin:0 14px 10px}.content-grid,.quiz-layout{padding:6px 14px 26px}.page-intro h2{font-size:25px}.page-intro p{font-size:13px}.hero-card{min-height:auto}.hero-copy{padding:28px 22px}.hero-copy h2{font-size:30px}.hero-copy p{font-size:13px}.stats-row{grid-template-columns:repeat(2,1fr);gap:9px}.stat-card{padding:13px}.two-col,.quiz-layout,.settings-grid{grid-template-columns:1fr}.quiz-side{order:-1}.quiz-side .sticky{position:static}.form-grid{grid-template-columns:1fr}.form-grid .wide{grid-column:auto}.options{grid-template-columns:1fr}.quiz-main{padding:17px}.quiz-head{align-items:flex-start}.quiz-head h2{font-size:20px}.progress-ring{width:66px;height:66px}.panel{border-radius:19px;padding:17px}.skill-row{grid-template-columns:1fr 44px}.skill-row .skill-meter{grid-column:1/-1;grid-row:2}.setting-item.danger{grid-column:auto}}
@media(max-width:420px){.stats-row{grid-template-columns:1fr}.hero-copy h2{font-size:27px}.quiz-head{display:grid;grid-template-columns:1fr auto}.q-top{align-items:flex-start}.q-top div{max-width:70%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
.auth-status{color:var(--muted);font-size:11px}.account-card{display:flex;align-items:flex-start;gap:13px}.account-card>svg{color:var(--red);flex:none}.account-body{display:grid;gap:9px;flex:1}.account-body>span{font-size:12px;color:var(--muted)}.account-body input{width:100%;border:1px solid #dfd0c9;background:#fffaf8;color:#3b312d;padding:11px 12px;border-radius:12px;min-height:44px}.auth-tabs{display:flex;gap:6px;background:#f7f0ec;padding:4px;border-radius:12px}.auth-tabs button{flex:1;border:0;background:transparent;border-radius:9px;padding:8px 10px;font-size:12px;font-weight:700;color:var(--muted)}.auth-tabs button.active{background:#fff;color:var(--red);box-shadow:0 2px 8px rgba(82,45,31,.08)}.auth-message{font-size:11px;line-height:1.5;color:#6f625c}.account-card .primary,.account-card .secondary{width:max-content}
@media(max-width:760px){.auth-status{display:none}.account-card .primary,.account-card .secondary{width:100%}}