/* ============ ExamHub — app.css ============ */
:root{--p:#4f46e5;--pd:#4338ca;--bg:#f1f5f9;--tx:#1e293b;--mut:#64748b;--line:#e2e8f0;--grn:#16a34a;--red:#dc2626}
*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',system-ui,-apple-system,sans-serif}
body{background:var(--bg);color:var(--tx);min-height:100vh}
.hidden{display:none!important}
button{font-family:inherit}
a{color:var(--p)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:6px;border:none;cursor:pointer;padding:9px 16px;border-radius:8px;font-size:14px;font-weight:600;transition:.15s;text-decoration:none}
.btn-p{background:var(--p);color:#fff}.btn-p:hover{background:var(--pd)}
.btn-s{background:#e2e8f0;color:#334155}.btn-s:hover{background:#cbd5e1}
.btn-d{background:var(--red);color:#fff}.btn-d:hover{background:#b91c1c}
.btn-g{background:var(--grn);color:#fff}.btn-g:hover{background:#15803d}
.btn-sm{padding:5px 10px;font-size:12px;border-radius:6px}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ---------- Login ---------- */
#loginScreen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#312e81,#4f46e5 55%,#7c3aed);padding:20px}
.login-card{background:#fff;border-radius:16px;padding:34px;width:100%;max-width:430px;box-shadow:0 25px 60px rgba(0,0,0,.35)}
.login-card h1{font-size:22px;text-align:center;margin-bottom:4px}
.login-card .sub{text-align:center;color:var(--mut);font-size:13px;margin-bottom:22px}
.logo{width:54px;height:54px;background:var(--p);border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:26px}
.demo-creds{margin-top:18px;background:#f8fafc;border:1px dashed var(--line);border-radius:10px;padding:12px 14px;font-size:12px;color:var(--mut);line-height:1.9}
.demo-creds code{background:#eef2ff;color:var(--p);padding:1px 6px;border-radius:4px;font-weight:700}

/* ---------- Layout ---------- */
#app{display:flex;min-height:100vh}
#sidebar{width:230px;background:#0f172a;color:#94a3b8;flex-shrink:0;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.sb-brand{padding:20px;color:#fff;font-weight:700;font-size:17px;border-bottom:1px solid #1e293b}
.sb-menu{padding:12px;flex:1}
.sb-item{display:block;padding:11px 14px;color:#94a3b8;border-radius:8px;font-size:14px;margin-bottom:4px;font-weight:500;text-decoration:none;border:none;background:none;width:100%;text-align:left;cursor:pointer}
.sb-item:hover{background:#1e293b;color:#fff}
.sb-item.active{background:var(--p);color:#fff}
.sb-foot{padding:14px 16px;border-top:1px solid #1e293b;font-size:12px;color:#64748b}
#main{flex:1;padding:26px;min-width:0}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.topbar h2{font-size:22px}

/* ---------- Common ---------- */
.row-b{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.grow{flex:1}
.mut{color:var(--mut)}.sm{font-size:12.5px}
.card{background:#fff;border-radius:12px;padding:20px;box-shadow:0 1px 3px rgba(0,0,0,.08);margin-bottom:18px}
.card h3{margin-bottom:8px;font-size:16px}
.empty{padding:44px 20px;text-align:center;color:var(--mut);background:#fff;border-radius:12px;border:1px dashed var(--line)}
hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.act{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
code{background:#f1f5f9;padding:1px 6px;border-radius:4px;font-size:13px}
.inp{width:100%;padding:9px 12px;border:1px solid #cbd5e1;border-radius:8px;font-size:14px;background:#fff;color:var(--tx)}
.inp:focus{outline:none;border-color:var(--p);box-shadow:0 0 0 3px #c7d2fe}
.frm{display:grid;gap:14px}
.frm label{font-size:13px;font-weight:600;color:#475569;display:block;margin-bottom:5px}
.frm input,.frm select,.frm textarea{width:100%;padding:9px 12px;border:1px solid #cbd5e1;border-radius:8px;font-size:14px;background:#fff;color:var(--tx)}
.frm input:focus,.frm select:focus,.frm textarea:focus{outline:none;border-color:var(--p);box-shadow:0 0 0 3px #c7d2fe}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.hint{font-size:12.5px;color:var(--mut);background:#f8fafc;border:1px dashed var(--line);padding:10px;border-radius:8px;line-height:1.6}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-bottom:20px}
.stat{background:#fff;padding:20px;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.08);border-left:4px solid var(--p)}
.stat.red{border-color:var(--red)}.stat.green{border-color:var(--grn)}
.stat .num{font-size:28px;font-weight:800}
.stat .lbl{font-size:13px;color:var(--mut);margin-top:2px}
.badge{padding:3px 10px;border-radius:20px;font-size:12px;font-weight:700;white-space:nowrap}
.b-green{background:#dcfce7;color:#166534}.b-red{background:#fee2e2;color:#991b1b}
.b-yellow{background:#fef3c7;color:#92400e}.b-blue{background:#dbeafe;color:#1d4ed8}
.b-gray{background:#e2e8f0;color:#475569}
.tbl{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.tbl th{background:#f8fafc;text-align:left;padding:12px 14px;font-size:11.5px;text-transform:uppercase;letter-spacing:.5px;color:var(--mut);border-bottom:1px solid var(--line)}
.tbl td{padding:12px 14px;border-bottom:1px solid #f1f5f9;font-size:14px;vertical-align:middle}
.tbl tr:last-child td{border-bottom:none}
.tbl tbody tr:hover td{background:#f8fafc}
.avatar{width:52px;height:52px;border-radius:50%;background:var(--p);color:#fff;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center}
.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.exam-card{background:#fff;border-radius:12px;padding:18px;box-shadow:0 1px 3px rgba(0,0,0,.08);display:flex;flex-direction:column;gap:8px;border-top:4px solid var(--p)}
.rules{padding-left:18px;display:grid;gap:6px;font-size:14px;color:#334155}
.pickbox{max-height:190px;overflow-y:auto;border:1px solid var(--line);border-radius:10px;padding:8px;margin:8px 0 14px;background:#f8fafc}
.pick-row{display:flex;align-items:center;gap:8px;padding:8px 10px;background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:6px}
.pick-txt{flex:1;font-size:13px}
.chip{font-size:11px;font-weight:700;padding:2px 8px;border-radius:12px;background:#eef2ff;color:var(--p);white-space:nowrap}
.c-blue{background:#dbeafe;color:#1d4ed8}.c-org{background:#ffedd5;color:#c2410c}
.chk{display:flex;gap:9px;align-items:center;font-size:14px;padding:5px 0}
.chk-i{font-weight:800}
.chk.ok .chk-i{color:var(--grn)}.chk.no .chk-i{color:var(--red)}

/* ---------- Dialog (popup) ---------- */
dialog{border:none;border-radius:14px;padding:0;max-width:680px;width:92%;box-shadow:0 25px 60px rgba(0,0,0,.35)}
dialog.large{max-width:920px}
dialog::backdrop{background:rgba(15,23,42,.6)}
.dlg-pad{padding:22px}
.dlg-head{display:flex;justify-content:space-between;align-items:center;padding:15px 22px;border-bottom:1px solid var(--line)}

/* ---------- Exam Player ---------- */
#examPlayer{position:fixed;inset:0;background:#fff;z-index:150;display:flex;flex-direction:column;user-select:none}
.ep-head{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:13px 22px;background:#0f172a;color:#fff;flex-wrap:wrap}
.ep-t{font-weight:700;font-size:16px}
.ep-m{font-size:12px;color:#94a3b8;margin-top:2px}
.ep-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.dots span{display:inline-block;width:12px;height:12px;border-radius:50%;background:#334155;margin-left:6px}
.dots span.on{background:var(--red)}
.timer{font-size:19px;font-weight:800;font-variant-numeric:tabular-nums;background:#1e293b;padding:6px 14px;border-radius:8px;color:#fff}
.timer.low{background:var(--red);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}
.ep-body{flex:1;display:flex;overflow:hidden}
.ep-qwrap{flex:1;padding:28px;overflow-y:auto}
.ep-side{width:225px;border-left:1px solid var(--line);padding:20px;background:#f8fafc;flex-shrink:0}
.ep-side-t{font-weight:700;font-size:13px;margin-bottom:12px}
.pal{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.pal-b{padding:9px 0;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer;font-weight:700}
.pal-b.ans{background:var(--grn);color:#fff;border-color:var(--grn)}
.pal-b.cur{outline:3px solid var(--p)}
.q-num{color:var(--mut);font-size:13px;font-weight:600}
.q-type{font-size:11px;font-weight:800;letter-spacing:1px;color:var(--p);text-transform:uppercase;margin-top:4px}
.q-text{font-size:18px;font-weight:600;margin:12px 0 20px;line-height:1.55}
.opt{border:2px solid var(--line);border-radius:10px;padding:13px 16px;margin-bottom:10px;cursor:pointer;display:flex;gap:12px;align-items:center;font-size:15px}
.opt:hover{border-color:#c7d2fe}
.opt.sel{border-color:var(--p);background:#eef2ff}
.opt-k{width:28px;height:28px;border-radius:50%;background:#f1f5f9;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex-shrink:0}
.opt.sel .opt-k{background:var(--p);color:#fff}
.subj-ta{width:100%;min-height:150px;border:2px solid var(--line);border-radius:10px;padding:14px;font-size:15px;resize:vertical;user-select:text}
.ep-nav{display:flex;justify-content:space-between;margin-top:26px}
.legend{font-size:11.5px;color:var(--mut);margin-top:14px;line-height:1.8}

/* ---------- CBSE Marksheet ---------- */
.msheet{border:3px double #1e293b;max-width:780px;margin:0 auto;padding:24px 30px;font-family:Georgia,'Times New Roman',serif;background:#fff}
.ms-head{text-align:center;border-bottom:2px solid #1e293b;padding-bottom:12px;margin-bottom:16px}
.ms-head h2{font-size:20px;letter-spacing:1.5px}
.ms-head .sub{font-size:12px;color:#475569;margin-top:4px}
.ms-info{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px;font-size:14px;margin-bottom:12px}
.ms-tbl{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:14px}
.ms-tbl th,.ms-tbl td{border:1px solid #1e293b;padding:7px 8px;text-align:center}
.ms-tbl th{background:#f1f5f9}
.ms-tbl td.l,.ms-tbl th.l{text-align:left}
.ms-result{text-align:center;font-size:16px;font-weight:700;margin-top:6px;padding:9px;border:2px solid #1e293b}
.ms-foot{display:flex;justify-content:space-between;font-size:13px;margin-top:20px}
.ms-note{font-size:11px;color:#64748b;margin-top:14px;text-align:center}

/* ---------- Print & Responsive ---------- */
@media print{
  body *{visibility:hidden}
  #msArea,#msArea *{visibility:visible}
  #msArea{position:fixed;left:0;top:0;width:100%}
  .no-print{display:none!important}
}
@media(max-width:820px){.ep-side{display:none}.grid2,.grid3{grid-template-columns:1fr}}