:root{--bg:#f5f7fb;--card:#fff;--text:#152238;--muted:#667085;--line:#e4e9f0;--primary:#1269d3;--primary2:#0a4ea3;--success:#157347;--danger:#b42318;--warning:#b45f06;--shadow:0 10px 35px rgba(20,42,70,.08);--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans Bengali","Nirmala UI","Hind Siliguri","Segoe UI",Arial,sans-serif;line-height:1.6}a{color:var(--primary);text-decoration:none}img{max-width:100%}.container{width:min(1180px,calc(100% - 28px));margin:auto}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;gap:20px;min-height:70px}.brand{font-weight:900;color:var(--text);font-size:1.25rem;margin-right:auto}.nav-links{display:flex;gap:16px;align-items:center}.nav-links a{color:#344054;font-weight:700}.nav-toggle{display:none;background:none;border:0;font-size:1.5rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;background:var(--primary);color:#fff;border:0;border-radius:11px;padding:10px 16px;font-weight:800;cursor:pointer;font:inherit}.btn:hover{background:var(--primary2)}.btn.secondary{background:#edf4ff;color:var(--primary)}.btn.danger{background:#d92d20}.btn.success{background:#168352}.btn.ghost{background:#fff;color:#344054;border:1px solid var(--line)}.btn.sm{padding:7px 10px;font-size:.88rem}.main{padding:34px 0 60px}.hero{background:linear-gradient(135deg,#0d5fbd,#0d7ab8);border-radius:28px;color:#fff;padding:54px 46px;box-shadow:var(--shadow);position:relative;overflow:hidden}.hero:after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;background:#ffffff16;right:-80px;top:-120px}.hero h1{font-size:clamp(2rem,5vw,3.6rem);line-height:1.1;margin:0 0 14px;max-width:780px}.hero p{max-width:760px;font-size:1.08rem;opacity:.92}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.hero .btn.secondary{background:#fff;color:#0d5fbd}.section{margin-top:34px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}.section-head h2{margin:0;font-size:1.55rem}.grid{display:grid;gap:18px}.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 3px 12px rgba(20,42,70,.03)}.card h3{margin-top:0}.muted{color:var(--muted)}.badge{display:inline-flex;padding:4px 9px;border-radius:999px;background:#eef4ff;color:#2456a6;font-size:.78rem;font-weight:800}.badge.success{background:#e8f8ef;color:#157347}.badge.danger{background:#fff0ef;color:#b42318}.badge.warning{background:#fff6e9;color:#a15c09}.kpi{font-size:2rem;font-weight:900;margin:3px 0}.form-card{max-width:720px;margin:auto}.form-group{margin-bottom:16px}label{display:block;font-weight:800;margin-bottom:6px}input,select,textarea{width:100%;padding:11px 12px;border:1px solid #cfd8e4;border-radius:10px;background:#fff;color:var(--text);font:inherit}textarea{min-height:120px;resize:vertical}input:focus,select:focus,textarea:focus{outline:3px solid #1269d31c;border-color:#4d8edb}.help{font-size:.86rem;color:var(--muted);margin-top:5px}.alert{padding:13px 16px;border-radius:12px;margin-bottom:18px}.alert.error{background:#fff0ef;color:#912018;border:1px solid #ffd0cc}.alert.success{background:#edfbf3;color:#146c43;border:1px solid #c7f0d9}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px}.table{width:100%;border-collapse:collapse;min-width:720px}.table th,.table td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.table th{background:#f8fafc;font-size:.86rem;color:#475467;white-space:nowrap}.table tr:last-child td{border-bottom:0}.row-actions{display:flex;gap:7px;flex-wrap:wrap}.stat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.stat{background:#fff;border:1px solid var(--line);border-radius:15px;padding:17px}.stat .value{font-size:1.7rem;font-weight:900}.footer{border-top:1px solid var(--line);background:#fff;padding:28px 0;color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1fr;gap:20px}.stack>*+*{margin-top:12px}.inline{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.pill{padding:7px 11px;background:#f2f4f7;border-radius:999px}.content-body{font-size:1.04rem}.content-body h2,.content-body h3{margin-top:1.5em}.content-body table{border-collapse:collapse;width:100%}.content-body td,.content-body th{border:1px solid var(--line);padding:8px}.chapter-nav{display:flex;justify-content:space-between;gap:12px;margin-top:26px}.admin-shell{display:grid;grid-template-columns:245px 1fr;min-height:100vh}.admin-side{background:#10233d;color:#dbe8f7;padding:22px 16px;position:sticky;top:0;height:100vh;overflow:auto}.admin-side .brand{color:#fff;display:block;margin-bottom:20px}.admin-side a{display:block;color:#dbe8f7;padding:9px 11px;border-radius:9px;margin:3px 0;font-weight:700}.admin-side a:hover{background:#ffffff12}.admin-content{padding:24px;min-width:0}.admin-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.admin-top h1{margin:0;font-size:1.7rem}.admin-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:18px}.compact-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.target-list{max-height:230px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:10px}.check-row{display:flex;gap:8px;align-items:flex-start;margin:5px 0}.check-row input{width:auto;margin-top:5px}.question-shell{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:20px}.question-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}.option{display:flex;gap:10px;padding:11px;border:1px solid var(--line);border-radius:11px;margin:9px 0;cursor:pointer}.option:has(input:checked){border-color:var(--primary);background:#f0f6ff}.option input{width:auto}.qnav{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.qnav button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px;cursor:pointer}.qnav button.answered{background:#e7f7ee;border-color:#9dddbb}.qnav button.review{box-shadow:inset 0 0 0 2px #f4a62a}.timer{font-weight:900;font-variant-numeric:tabular-nums}.result-correct{border-left:5px solid #168352}.result-wrong{border-left:5px solid #d92d20}.rule-row{display:grid;grid-template-columns:2fr 1.2fr .7fr auto;gap:8px;margin:8px 0}.mobile-admin-toggle{display:none}.math-toolbar button{padding:5px 8px;margin:2px;border:1px solid var(--line);background:white;border-radius:7px;cursor:pointer}
@media(max-width:960px){.grid.cols-4{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(2,1fr)}.stat-grid{grid-template-columns:repeat(2,1fr)}.compact-grid{grid-template-columns:repeat(2,1fr)}.admin-shell{grid-template-columns:1fr}.admin-side{position:relative;height:auto}.question-shell{grid-template-columns:1fr}.admin-side nav{display:flex;flex-wrap:wrap}.admin-side a{display:inline-block}.question-nav-side{order:-1}}
@media(max-width:720px){.nav-toggle{display:block}.nav-links{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:16px;flex-direction:column;align-items:stretch}.nav-links.open{display:flex}.hero{padding:36px 24px;border-radius:20px}.grid.cols-2,.grid.cols-3,.grid.cols-4,.split,.stat-grid,.compact-grid{grid-template-columns:1fr}.main{padding-top:22px}.admin-content{padding:16px}.rule-row{grid-template-columns:1fr}.chapter-nav{flex-direction:column}}
.janbo-login-btn{width:100%;margin:8px 0 4px;background:#172b4d;color:#fff;border:1px solid #172b4d;font-weight:800}.janbo-login-btn:hover{background:#0f213d}.janbo-mark{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;background:#fff;color:#1269d3;font-family:Arial,sans-serif;font-weight:900}.login-divider{display:flex;align-items:center;gap:12px;margin:18px 0;color:var(--muted);font-size:.88rem}.login-divider:before,.login-divider:after{content:"";height:1px;background:var(--line);flex:1}.brand-text{font-weight:900;letter-spacing:-.01em}
.site-logo{height:42px;width:auto;max-width:180px;object-fit:contain;display:block}.brand-text{display:flex;align-items:center;gap:10px}.admin-brand{display:flex!important;align-items:center;gap:9px}.admin-brand img{height:34px;width:auto;max-width:150px;object-fit:contain}.recovery-key-box{display:flex;align-items:center;gap:12px;flex-wrap:wrap;background:#f7f9fc;border:1px dashed #b8c5d6;border-radius:14px;padding:16px}.recovery-key-box code{font-family:Consolas,"Courier New",monospace;font-size:1.35rem;font-weight:900;letter-spacing:.12em;color:#0a4ea3}.danger-zone{border-color:#ffd1cd}.soft-rule{border:0;border-top:1px solid var(--line);margin:20px 0}.setting-preview{display:block;max-width:220px;max-height:100px;object-fit:contain;background:#f7f9fc;border:1px solid var(--line);border-radius:10px;padding:8px;margin:6px 0 10px}.favicon-preview{width:72px;height:72px}.admin-card h3{margin-top:0}.table .btn{white-space:nowrap}
@media(max-width:720px){.site-logo{height:34px;max-width:120px}.recovery-key-box code{font-size:1.05rem}}