:root{
  --ink:#1E2A4A;
  --ink-2:#28395F;
  --gold:#C99A3E;
  --gold-light:#E7C77C;
  --paper:#F6F4EF;
  --paper-2:#EFEAE0;
  --card:#FFFFFF;
  --question:#C0392B;
  --answer:#1C1C1C;
  --muted:#5B6B82;
  --success:#3F8757;
  --danger:#C0392B;
  --border:#E4E0D6;
  --radius:14px;
  --shadow:0 2px 10px rgba(30,42,74,0.08);
  font-size:16px;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Hind Siliguri', -apple-system, sans-serif;
  -webkit-tap-highlight-color:transparent;
  overscroll-behavior:none;
}
h1,h2,h3,.display{
  font-family:'Tiro Bangla', 'Hind Siliguri', serif;
  font-weight:400;
}
button{font-family:inherit;}
input,textarea,select{font-family:'Hind Siliguri', sans-serif;}

#app{height:100%;min-height:100vh;}
.screen{min-height:100vh;display:flex;flex-direction:column;}
.screen[hidden]{display:none !important;}

/* ---------- Login ---------- */
#screen-login{
  align-items:center;justify-content:center;
  background:radial-gradient(circle at 30% 10%, var(--ink-2), var(--ink) 65%);
  padding:32px 24px;
}
.login-wrap{width:100%;max-width:380px;text-align:center;}
.brand-mark{margin-bottom:10px;}
.brand-title{color:#fff;font-size:1.9rem;margin:6px 0 2px;letter-spacing:.3px;}
.brand-title span{color:var(--gold-light);}
.brand-tag{color:#C7D0E0;font-size:.92rem;margin-bottom:28px;}
.login-version{
  color:#8FA0BF;font-size:.72rem;letter-spacing:.5px;margin-bottom:10px;
  background:rgba(255,255,255,.08);display:inline-block;padding:3px 12px;border-radius:12px;
}
.login-form{
  background:var(--card);border-radius:18px;padding:24px 20px;
  box-shadow:0 12px 30px rgba(0,0,0,.25);text-align:right;
}
.login-form label{
  display:block;text-align:right;font-size:.85rem;color:var(--muted);margin-bottom:14px;
}
.login-form input{
  width:100%;margin-top:6px;padding:12px 14px;border-radius:10px;
  border:1.5px solid var(--border);font-size:1rem;background:var(--paper);
  text-align:left;direction:ltr;
}
.login-form input:focus{outline:2px solid var(--gold);border-color:var(--gold);}
.password-field{position:relative;display:flex;align-items:center;}
.password-field input{padding-right:44px;}
.password-toggle{
  position:absolute;right:6px;top:50%;transform:translateY(-50%);
  background:none;border:none;padding:6px;color:var(--muted);display:flex;cursor:pointer;
}
.password-toggle.active{color:var(--gold);}
.login-hint{color:#B9C2D6;font-size:.8rem;margin-top:16px;}
.form-error{color:#ffd9d3;background:rgba(192,57,43,.85);padding:8px 10px;border-radius:8px;font-size:.85rem;margin-bottom:12px;}

/* ---------- Buttons ---------- */
.btn{
  border:none;border-radius:10px;padding:12px 18px;font-size:.95rem;font-weight:600;
  cursor:pointer;transition:transform .08s ease, opacity .15s;
}
.btn:active{transform:scale(.97);}
.btn-block{width:100%;}
.btn-primary{background:var(--ink);color:#fff;}
.btn-gold{background:var(--gold);color:#1E1500;}
.btn-outline{background:transparent;border:1.5px solid var(--ink);color:var(--ink);}
.btn-danger{background:var(--danger);color:#fff;}
.btn-success{background:var(--success);color:#fff;}
.btn-ghost{background:var(--paper-2);color:var(--ink);}
.btn-ghost-dark{background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.3);}
.btn-sm{padding:7px 12px;font-size:.8rem;border-radius:8px;}
.btn:disabled{opacity:.5;cursor:not-allowed;}

/* ---------- Blocked ---------- */
.screen-black{background:#0A0A0A;color:#fff;align-items:center;justify-content:center;text-align:center;}
.blocked-wrap{max-width:320px;padding:24px;}
.blocked-wrap h2{margin:16px 0 8px;font-size:1.4rem;}
.blocked-wrap p{color:#B7B7B7;margin-bottom:24px;}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  background:var(--ink);color:#fff;
  padding:14px 16px;display:flex;align-items:center;justify-content:space-between;
  box-shadow:0 2px 8px rgba(0,0,0,.15);
}
.topbar-brand{display:flex;flex-direction:column;line-height:1.1;}
.topbar-title{font-family:'Tiro Bangla',serif;font-size:1.15rem;}
.topbar-title b{color:var(--gold-light);font-weight:600;}
.topbar-version{font-size:.65rem;color:#9FB0CC;letter-spacing:.5px;}
.topbar-user{display:flex;align-items:center;gap:8px;font-size:.85rem;max-width:40%;}
.topbar-user span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

.avatar{border-radius:50%;object-fit:cover;background:var(--paper-2);border:2px solid var(--gold-light);}
.avatar-sm{width:30px;height:30px;}
.avatar-md{width:56px;height:56px;}
.avatar-lg{width:88px;height:88px;}

/* ---------- Content ---------- */
.content{flex:1;padding:16px 14px 90px;max-width:640px;margin:0 auto;width:100%;}
.section-title{font-size:1.05rem;margin:18px 0 10px;color:var(--ink);display:flex;align-items:center;gap:8px;}
.section-title:first-child{margin-top:4px;}
.eyebrow{font-size:.72rem;letter-spacing:1px;color:var(--gold);text-transform:uppercase;font-weight:700;}

/* ---------- Bottom nav ---------- */
.bottomnav{
  position:fixed;bottom:0;left:0;right:0;z-index:30;
  display:flex;background:var(--card);border-top:1px solid var(--border);
  padding:6px 6px calc(6px + env(safe-area-inset-bottom));
  box-shadow:0 -2px 10px rgba(0,0,0,.06);
}
.nav-btn{
  flex:1;background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:8px 4px;color:var(--muted);font-size:.72rem;border-radius:10px;
}
.nav-btn.active{color:var(--ink);background:var(--paper-2);}
.nav-btn.active svg{color:var(--gold);}

/* ---------- Cards ---------- */
.card{
  background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:14px;
  box-shadow:var(--shadow);border:1px solid var(--border);
}
.q-card{border-left:4px solid var(--question);}
.q-text{color:var(--question);font-size:1.02rem;font-weight:600;line-height:1.55;margin:0 0 8px;}
.q-meta{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px;}
.tag{
  font-size:.7rem;background:var(--paper-2);color:var(--muted);padding:3px 9px;border-radius:20px;
  border:1px solid var(--border);
}
.tag-marks{background:var(--ink);color:#fff;}
.tag-status-submitted{background:#FFF3CD;color:#8A6D00;border-color:#F3E2A0;}
.tag-status-approved{background:#E4F3E9;color:var(--success);border-color:#C8E6D4;}
.tag-status-blocked{background:#FDEAE8;color:var(--danger);border-color:#F5CFCB;}
.q-image{max-width:100%;border-radius:10px;margin-bottom:10px;display:block;}
.a-text{color:var(--answer);white-space:pre-wrap;line-height:1.6;font-size:.95rem;}
.q-actions{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;}
textarea.answer-input{
  width:100%;min-height:110px;border-radius:10px;border:1.5px solid var(--border);
  padding:12px;font-size:.95rem;color:var(--answer);resize:vertical;margin-bottom:10px;background:var(--paper);
}
textarea.answer-input:focus{outline:2px solid var(--gold);border-color:var(--gold);}

/* ---------- Ranking ---------- */
.rank-row{display:flex;align-items:center;gap:12px;padding:10px 4px;border-bottom:1px solid var(--border);}
.rank-row:last-child{border-bottom:none;}
.rank-badge{
  width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.8rem;background:var(--paper-2);color:var(--muted);flex-shrink:0;
}
.rank-badge.r1{background:#F4D480;color:#5C4300;}
.rank-badge.r2{background:#DCE1E8;color:#4A4A4A;}
.rank-badge.r3{background:#E8C6A0;color:#5C3A1E;}
.rank-info{flex:1;min-width:0;}
.rank-name{font-weight:600;font-size:.92rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.rank-sub{font-size:.75rem;color:var(--muted);}
.rank-points{font-weight:700;color:var(--gold);font-size:.95rem;white-space:nowrap;}

/* ---------- Bar chart ---------- */
.barchart{display:flex;flex-direction:column;gap:10px;}
.bar-row{display:grid;grid-template-columns:84px 1fr 30px;align-items:center;gap:8px;}
.bar-label{font-size:.78rem;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.bar-track{background:var(--paper-2);border-radius:20px;height:14px;overflow:hidden;}
.bar-fill{height:100%;background:linear-gradient(90deg,var(--ink),var(--ink-2));border-radius:20px;}
.bar-value{font-size:.75rem;color:var(--muted);text-align:right;}

/* ---------- Activity feed ---------- */
.activity-item{display:flex;gap:10px;padding:10px 0;border-bottom:1px solid var(--border);}
.activity-item:last-child{border-bottom:none;}
.activity-dot{width:8px;height:8px;border-radius:50%;background:var(--gold);margin-top:6px;flex-shrink:0;}
.activity-text{font-size:.85rem;line-height:1.5;}
.activity-time{font-size:.72rem;color:var(--muted);}

/* ---------- Forms / admin ---------- */
.field{margin-bottom:12px;}
.field label{display:block;font-size:.8rem;color:var(--muted);margin-bottom:5px;}
.field input,.field select,.field textarea{
  width:100%;padding:10px 12px;border-radius:9px;border:1.5px solid var(--border);font-size:.92rem;background:var(--paper);
}
.field textarea{min-height:70px;resize:vertical;}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.subtabs{display:flex;gap:8px;margin-bottom:14px;overflow-x:auto;}
.subtab-btn{
  flex-shrink:0;padding:8px 14px;border-radius:20px;border:1.5px solid var(--border);background:var(--card);
  color:var(--muted);font-size:.82rem;font-weight:600;
}
.subtab-btn.active{background:var(--ink);color:#fff;border-color:var(--ink);}

textarea.tsv-input{
  width:100%;min-height:150px;font-family:monospace;font-size:.82rem;padding:12px;
  border-radius:10px;border:1.5px solid var(--border);background:var(--paper);
}
table.preview-table{width:100%;border-collapse:collapse;font-size:.78rem;margin-top:10px;}
table.preview-table th,table.preview-table td{border:1px solid var(--border);padding:6px 8px;text-align:right;vertical-align:top;}
table.preview-table th{background:var(--paper-2);}
table.preview-table select{width:100%;font-size:.75rem;padding:4px;}

.student-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--border);}
.student-row:last-child{border-bottom:none;}
.student-info{flex:1;min-width:0;}
.student-name{font-weight:600;font-size:.9rem;}
.student-mobile{font-size:.75rem;color:var(--muted);}
.status-pill{font-size:.68rem;padding:2px 8px;border-radius:10px;}
.status-active{background:#E4F3E9;color:var(--success);}
.status-blocked{background:#FDEAE8;color:var(--danger);}

.empty-state{text-align:center;padding:40px 16px;color:var(--muted);}
.empty-state svg{margin-bottom:10px;opacity:.6;}

/* ---------- Modal ---------- */
.modal-overlay{
  position:fixed;inset:0;background:rgba(10,14,26,.55);display:flex;align-items:flex-end;justify-content:center;
  z-index:100;
}
.modal-box{
  background:var(--card);border-radius:18px 18px 0 0;padding:20px;width:100%;max-width:480px;max-height:85vh;overflow-y:auto;
  animation:slideup .2s ease;
}
@media (min-width:560px){
  .modal-overlay{align-items:center;}
  .modal-box{border-radius:18px;}
}
@keyframes slideup{from{transform:translateY(30px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.modal-title{font-size:1.05rem;margin:0 0 14px;}
.modal-actions{display:flex;gap:10px;margin-top:16px;}

/* ---------- Toast ---------- */
.toast{
  position:fixed;bottom:80px;left:50%;transform:translateX(-50%);
  background:var(--ink);color:#fff;padding:11px 20px;border-radius:24px;font-size:.85rem;
  box-shadow:0 6px 20px rgba(0,0,0,.25);z-index:200;max-width:90%;text-align:center;
}
.toast.error{background:var(--danger);}
.toast.success{background:var(--success);}

/* ---------- Loading: spinner & skeleton ---------- */
.spinner{
  width:34px;height:34px;border:3px solid var(--border);border-top-color:var(--gold);
  border-radius:50%;animation:spin .7s linear infinite;margin:0 auto;
}
@keyframes spin{to{transform:rotate(360deg);}}

.skeleton-card{pointer-events:none;}
.skeleton{
  background:linear-gradient(90deg, var(--paper-2) 25%, #e3ddd0 37%, var(--paper-2) 63%);
  background-size:400% 100%;animation:skeleton-loading 1.4s ease infinite;
}
.skeleton-line{border-radius:6px;}
@keyframes skeleton-loading{0%{background-position:100% 50%;}100%{background-position:0 50%;}}

/* ---------- Content / card entrance animation ---------- */
.content.fade-in{animation:contentFade .28s ease;}
@keyframes contentFade{from{opacity:0;transform:translateY(4px);}to{opacity:1;transform:translateY(0);}}
.card{animation:cardIn .3s ease both;}
@keyframes cardIn{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}

/* ---------- Date badges on question cards ---------- */
.date-meta{
  display:flex;flex-wrap:wrap;gap:12px;font-size:.72rem;color:var(--muted);
  margin:-2px 0 10px;
}

/* ---------- Filter bar (student QnA) ---------- */
.filter-bar .field{margin-bottom:10px;}
.filter-bar .field:last-child{margin-bottom:0;}

/* ---------- Print-only content ---------- */
#print-area{display:none;}
.print-header{text-align:center;margin-bottom:22px;}
.print-header h1{font-family:'Tiro Bangla',serif;color:var(--ink);margin:0 0 4px;font-size:1.6rem;}
.print-header p{margin:2px 0;color:var(--muted);font-size:.85rem;}
.print-filter-line{font-style:italic;}
.print-q-block{margin-bottom:18px;padding-bottom:14px;border-bottom:1px dashed var(--border);page-break-inside:avoid;}
.print-q-meta{font-size:.72rem;color:var(--muted);margin-bottom:4px;}
.print-q-text{color:var(--question);font-weight:600;margin:4px 0;}
.print-a-text{color:var(--answer);white-space:pre-wrap;margin:4px 0;}
.preview-scroll{max-height:50vh;overflow-y:auto;padding-right:4px;}

@media print{
  body.printing-mode > #app{display:none !important;}
  body.printing-mode #print-area{display:block !important;}
}

/* ---------- Utility ---------- */
.muted{color:var(--muted);}
.flex-between{display:flex;align-items:center;justify-content:space-between;gap:10px;}
.mt-0{margin-top:0;}
.center{text-align:center;}
.hidden{display:none !important;}

@media print{
  .topbar,.bottomnav,.q-actions,#modal-root{display:none !important;}
  body{background:#fff;}
  .content{padding:0;max-width:100%;}
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important;transition-duration:0.001ms !important;}
}