:root{
  --brand:#066fc6;--brand-dark:#084b87;--accent:#16a9ad;--ink:#17233b;--muted:#6b7280;
  --bg:#f6f9fc;--card:#fff;--line:#e2e8f0;--soft:#eef7ff;--soft2:#eefaf9;
  --ok:#16723a;--warn:#a85b00;--danger:#b42318;--info:#1d5fbf;
  --radius:14px;--sidebar:236px;--topbar:64px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI","Noto Sans Devanagari",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.45}
a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.hidden{display:none!important}
button,.btn,a.btn{touch-action:manipulation}
.topbar{position:sticky;top:0;z-index:50;height:var(--topbar);background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px;white-space:nowrap}.brand-logo{width:38px;height:38px;object-fit:contain;border-radius:9px;background:#fff}.brand-mark{width:36px;height:36px;border-radius:10px;background:var(--brand);display:grid;place-items:center;color:#fff;font-weight:900}
.top-actions{display:flex;align-items:center;gap:8px}.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--brand-dark);font-weight:800;border:1px solid #cfe5f6}
.lang-switch{min-height:38px!important;padding:7px 10px!important;font-size:13px!important;white-space:nowrap}.auth-lang{position:absolute;right:20px;top:20px}
.app-shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:calc(100vh - var(--topbar))}.sidebar{border-right:1px solid var(--line);background:#fff;padding:14px 10px;position:sticky;top:var(--topbar);height:calc(100vh - var(--topbar));overflow:auto;z-index:45}
.nav-section{font-size:11px;color:#94a3b8;padding:12px 11px 5px;font-weight:750}.nav-link{display:flex;gap:10px;align-items:center;min-height:44px;padding:10px 11px;border-radius:10px;color:#475569;margin:2px 0;font-weight:650}.nav-link:hover,.nav-link.active{background:var(--soft);color:var(--brand-dark)}.nav-link span:first-child{width:22px;text-align:center}
.sidebar-backdrop{display:none;position:fixed;inset:var(--topbar) 0 0 0;background:rgba(15,23,42,.30);z-index:40}.sidebar-backdrop.show{display:block}
.main{padding:24px;min-width:0;max-width:1180px;width:100%;margin:0 auto}.page-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.page-head h1{margin:0 0 4px;font-size:25px;line-height:1.2}.page-head p{margin:0;color:var(--muted);font-size:14px}
.grid{display:grid;gap:14px}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:17px;box-shadow:0 1px 3px rgba(15,23,42,.04)}.card h3{margin:0 0 8px}.muted{color:var(--muted)}.small{font-size:13px}.kpi{display:flex;justify-content:space-between;gap:12px}.kpi .value{font-size:25px;font-weight:850}.kpi .label{color:var(--muted);font-size:13px}.icon-box{width:42px;height:42px;border-radius:11px;background:var(--soft);display:grid;place-items:center;font-size:20px;flex:0 0 auto}
.home-action{display:flex;align-items:center;gap:13px;min-height:96px;transition:.15s}.home-action:hover{border-color:#badbf4}.home-action .home-icon{width:50px;height:50px;border-radius:13px;background:var(--soft);display:grid;place-items:center;font-size:26px;flex:0 0 auto}.home-action b{display:block;font-size:16px}.home-action .go{margin-left:auto;color:var(--brand);font-size:22px}
.btn{border:0;border-radius:10px;min-height:44px;padding:10px 14px;font-weight:750;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark)}.btn-soft{background:var(--soft);color:var(--brand-dark)}.btn-outline{background:#fff;border:1px solid var(--line);color:var(--ink)}.btn-danger{background:#fff0ef;color:var(--danger);border:1px solid #ffd5d2}.btn:disabled{opacity:.55;cursor:not-allowed}
.badge{display:inline-flex;align-items:center;border-radius:999px;padding:4px 8px;font-size:12px;font-weight:750;background:#f1f5f9;color:#475569}.badge.ok{background:#eaf8ef;color:#116431}.badge.warn{background:#fff5dd;color:#8b4a00}.badge.info{background:#eaf4ff;color:#185da6}.badge.danger{background:#fff0ef;color:#a61b12}
.input,.select,.textarea{width:100%;border:1px solid #d7dee8;background:#fff;border-radius:10px;min-height:44px;padding:10px 12px;outline:none}.input:focus,.select:focus,.textarea:focus{border-color:#6db5e7;box-shadow:0 0 0 3px #e8f5ff}.textarea{min-height:105px;resize:vertical}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-group{margin-bottom:13px}.form-group label{display:block;font-size:13px;font-weight:750;margin-bottom:6px}.toolbar{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.search{flex:1;min-width:220px}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:13px;background:#fff}table{width:100%;border-collapse:collapse;min-width:680px}th,td{padding:12px 13px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}th{font-size:12px;color:#64748b;background:#f8fafc;font-weight:750}tr:last-child td{border-bottom:0}
.simple-list{display:grid;gap:10px}.simple-item{background:#fff;border:1px solid var(--line);border-radius:13px;padding:14px;display:flex;align-items:center;gap:12px}.simple-item .simple-main{min-width:0;flex:1}.simple-item h3,.simple-item b{margin:0}.simple-item .simple-meta{font-size:13px;color:var(--muted);margin-top:4px}.simple-item .simple-score{font-size:20px;font-weight:850;color:var(--brand-dark)}
.product{display:flex;flex-direction:column;gap:9px}.cover{height:112px;border-radius:12px;background:var(--soft2);display:flex;align-items:center;justify-content:center;font-size:42px;border:1px solid #d8eeee}.price{font-weight:850;font-size:19px;color:var(--brand-dark)}.strike{text-decoration:line-through;color:#94a3b8;font-size:13px;margin-left:5px}
.hero{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;display:grid;grid-template-columns:1.2fr .8fr;gap:26px;align-items:center}.hero h1{font-size:38px;line-height:1.12;margin:0 0 12px}.hero p{font-size:17px;color:#526176;margin:0 0 18px}.hero-art{min-height:260px;border-radius:18px;background:var(--soft);display:grid;place-items:center;padding:24px;text-align:center}.hero-logo{width:min(210px,70%);aspect-ratio:1;object-fit:contain;border-radius:22px;background:#fff;padding:7px;border:1px solid var(--line)}
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.mini-stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px;text-align:center}.mini-stat b{font-size:17px;display:block}.mini-stat span{font-size:12px;color:var(--muted)}
.section{margin-top:24px}.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.section-title h2{margin:0;font-size:20px}
.progress{height:7px;background:#edf1f5;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:var(--brand);border-radius:999px}.question{padding:16px;border:1px solid var(--line);border-radius:13px;background:#fff}.options{display:grid;gap:9px;margin-top:12px}.option{border:1px solid var(--line);padding:12px;border-radius:10px;cursor:pointer;min-height:46px}.option:hover{border-color:#8fc5eb;background:#f8fcff}.option.selected{border-color:var(--brand);background:var(--soft)}.timer{font-weight:850;color:var(--danger)}
.upload-zone{border:1.5px dashed #8bbddd;background:#f8fcff;border-radius:13px;padding:23px;text-align:center}.upload-zone input[type=file]{max-width:100%}.preview-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:9px;margin-top:11px}.preview{height:105px;border-radius:10px;border:1px solid var(--line);overflow:hidden;background:#f1f5f9;display:grid;place-items:center;font-size:12px;padding:5px}.preview img{width:100%;height:100%;object-fit:cover}
.notice{border:1px solid #dbeafe;background:#f3f8ff;padding:11px 13px;border-radius:10px}.success{border-color:#ccebd6;background:#f0fbf4}.warning{border-color:#f5ddb0;background:#fffaf0}.danger-note{border-color:#ffd8d4;background:#fff5f4}
.auth-wrap{min-height:100vh;display:grid;grid-template-columns:.9fr 1.1fr;background:#fff}.auth-side{background:#f2f8fd;color:var(--ink);padding:54px;display:flex;flex-direction:column;justify-content:center;border-right:1px solid var(--line)}.auth-side h1{font-size:36px;margin:0 0 12px;color:var(--brand-dark)}.auth-side p{color:var(--muted);font-size:16px}.auth-card-wrap{display:grid;place-items:center;padding:28px;position:relative}.auth-card{width:min(440px,100%);background:#fff;border:1px solid var(--line);border-radius:17px;padding:26px;box-shadow:0 4px 18px rgba(15,23,42,.06)}.auth-card h2{margin-top:22px}.demo-tools{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}.demo-tools summary{cursor:pointer;color:var(--muted);font-size:13px}
.mobile-menu{display:none}.footer{padding:26px;text-align:center;color:#64748b;font-size:13px}.chart-bars{display:flex;align-items:end;gap:9px;height:160px;padding-top:15px}.bar{flex:1;background:var(--brand);border-radius:8px 8px 3px 3px;min-width:16px;position:relative}.bar span{position:absolute;bottom:100%;left:50%;transform:translateX(-50%);font-size:11px;color:#64748b;margin-bottom:4px}.tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}.tab{min-height:40px;padding:8px 11px;border-radius:999px;border:1px solid var(--line);background:#fff;cursor:pointer;font-weight:700}.tab.active{background:var(--soft);color:var(--brand-dark);border-color:#b9d9ef}
.bottom-nav{display:none}.bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:#64748b;font-size:11px;font-weight:700;min-width:0}.bottom-nav a .bi{font-size:20px;line-height:1}.bottom-nav a.active{color:var(--brand)}
.page-mock-test .main>.toolbar:last-of-type{position:sticky;bottom:10px;background:rgba(246,249,252,.95);padding:9px;border:1px solid var(--line);border-radius:12px;z-index:20}.page-mock-test .page-head{position:sticky;top:var(--topbar);z-index:25;background:var(--bg);padding:10px 0;margin-top:-10px}
.mobile-only{display:none}
@media(max-width:1050px){
  .g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.hero-art{min-height:200px}
  .app-shell{grid-template-columns:1fr}.sidebar{position:fixed;left:0;top:var(--topbar);width:min(82vw,280px);transform:translateX(-105%);transition:transform .2s ease;display:block}.sidebar.open{transform:translateX(0)}.mobile-menu{display:inline-flex}
}
@media(max-width:720px){
  body.has-bottom-nav{padding-bottom:70px}.main{padding:16px 13px 22px}.g4,.g3,.g2,.form-row,.stat-strip{grid-template-columns:1fr}.page-head{align-items:flex-start;flex-direction:column;margin-bottom:16px}.page-head h1{font-size:23px}.page-head>.btn{width:100%}.hero{padding:20px;border-radius:16px}.hero h1{font-size:30px}.hero p{font-size:15px}.hero-art{display:none}.auth-wrap{grid-template-columns:1fr}.auth-side{display:none}.topbar{padding:0 10px}.top-actions .label{display:none}.card{padding:14px}.cover{height:94px}.brand-logo{width:35px;height:35px}.brand{font-size:16px}.btn{min-height:46px}.toolbar>.btn{flex-shrink:0}
  .bottom-nav{position:fixed;display:grid;grid-template-columns:repeat(5,1fr);left:0;right:0;bottom:0;height:66px;padding:5px 5px calc(5px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line);z-index:60}.page-mock-test .bottom-nav,.page-teacher-evaluate .bottom-nav{display:none}.page-mock-test,.page-teacher-evaluate{padding-bottom:0!important}
  .simple-item{align-items:flex-start}.simple-item .btn{min-height:40px;padding:8px 10px}.desktop-only{display:none!important}.mobile-only{display:block}.search{min-width:0;width:100%}.table-wrap{border-radius:11px}table{min-width:620px}
  .page-mock-test .page-head{top:var(--topbar);padding:9px 0}.page-mock-test .page-head p{font-size:13px}.page-mock-test .page-head .btn{width:auto;align-self:stretch}.page-mock-test .main>.toolbar:last-of-type{bottom:8px}
  .auth-card-wrap{padding:18px 14px}.auth-card{padding:20px}.auth-lang{right:14px;top:12px}.section{margin-top:20px}
}
@media(max-width:390px){.brand span{display:none}.lang-switch{padding:7px 8px!important}.top-actions{gap:5px}.page-head h1{font-size:22px}.hero h1{font-size:27px}}
@media print{.topbar,.sidebar,.bottom-nav,.mobile-menu,.sidebar-backdrop,.lang-switch{display:none!important}.app-shell{display:block}.main{max-width:none;padding:0}.card{box-shadow:none}}