:root {
  --bg: #07111f;
  --card: #0d1f35;
  --navy: #112240;
  --navy2: #0a1628;
  --gold: #f0c040;
  --accent: #4fc3f7;
  --green: #2ecc71;
  --red: #e74c3c;
  --purple: #9b59b6;
  --text: #e8f0fe;
  --muted: #8ba3c4;
  --border: rgba(240, 192, 64, 0.15);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Sarabun', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse at 15% 15%, rgba(79,195,247,.06) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 85%, rgba(240,192,64,.07) 0%, transparent 55%);
}

#loginScreen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px 40px;
  width: 100%;
  max-width: 430px;
  box-shadow: 0 32px 64px rgba(0,0,0,.5);
  animation: fadeUp .6s ease;
}

.login-logo { text-align: center; margin-bottom: 32px; }
.login-logo img { animation: logo-float 3.4s ease-in-out infinite; }
@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
/* ผู้ใช้ที่ตั้งค่าลดการเคลื่อนไหวไว้ (เช่น เมารถง่าย) ต้องไม่เห็นภาพขยับ */
@media (prefers-reduced-motion: reduce) {
  .login-logo img { animation: none; }
}
.login-logo .crown { font-size: 52px; margin-bottom: 10px; display: block; }
.login-logo h1 { font-family: 'Prompt', sans-serif; font-size: 21px; font-weight: 800; color: var(--gold); line-height: 1.35; }
.login-logo p { color: var(--muted); font-size: 13px; margin-top: 6px; }
.login-tag { display: inline-block; background: rgba(79,195,247,.12); color: var(--accent); font-size: 11px; padding: 3px 10px; border-radius: 10px; margin-top: 8px; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; font-weight: 500; }
.form-group input { width: 100%; padding: 12px 16px; background: var(--navy); border: 1px solid rgba(255,255,255,.1); border-radius: 10px; color: var(--text); font-family: 'Sarabun', sans-serif; font-size: 15px; transition: border-color .2s; }
.form-group input:focus { outline: none; border-color: var(--gold); }

.btn-login { width: 100%; padding: 14px; background: linear-gradient(135deg, var(--gold), #d4a017); border: none; border-radius: 10px; color: var(--navy2); font-family: 'Prompt', sans-serif; font-size: 16px; font-weight: 800; cursor: pointer; transition: all .2s; margin-top: 6px; }
.btn-login:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(240,192,64,.35); }

.error-msg { color: var(--red); font-size: 13px; text-align: center; margin-top: 12px; display: none; }
.success-msg { color: var(--green); font-size: 13px; text-align: center; margin-top: 12px; display: none; }
.btn-register-link { width: 100%; padding: 10px; background: transparent; border: none; color: var(--accent); font-family: 'Sarabun', sans-serif; font-size: 14px; cursor: pointer; margin-top: 10px; text-align: center; }
.btn-register-link:hover { text-decoration: underline; }

.tab-badge { display: inline-block; background: var(--red); color: #fff; font-size: 11px; font-weight: 700; min-width: 18px; height: 18px; line-height: 18px; border-radius: 9px; text-align: center; margin-left: 6px; padding: 0 4px; }

.status-badge { font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 10px; margin-left: 8px; }
.status-approved { background: rgba(46,204,113,.15); color: var(--green); }
.status-pending { background: rgba(240,192,64,.15); color: var(--gold); }
.status-rejected { background: rgba(231,76,60,.15); color: var(--red); }
.legacy-badge { background: rgba(155,89,182,.16); color: #c79cff; }

.pending-item { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid rgba(255,255,255,.04); flex-wrap: wrap; gap: 10px; }
.pending-item:last-child { border-bottom: none; }
.pending-actions { display: flex; gap: 8px; }
.empty-note { padding: 20px; text-align: center; color: var(--muted); font-size: 14px; }

#appScreen { display: none; }

.header { background: var(--card); border-bottom: 1px solid var(--border); padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 58px; position: sticky; top: 0; z-index: 100; }
.header-title { font-family: 'Prompt', sans-serif; font-size: 15px; font-weight: 800; color: var(--gold); }
.header-right { display: flex; align-items: center; gap: 10px; }
.user-badge { background: var(--navy); border: 1px solid var(--border); padding: 5px 12px; border-radius: 20px; font-size: 13px; color: var(--muted); }
.btn-logout { background: transparent; border: 1px solid rgba(231,76,60,.4); color: var(--red); padding: 5px 14px; border-radius: 20px; font-size: 13px; cursor: pointer; transition: all .2s; font-family: 'Sarabun', sans-serif; }
.btn-logout:hover { background: rgba(231,76,60,.1); }

.nav-tabs { display: flex; gap: 2px; padding: 14px 20px 0; border-bottom: 1px solid var(--border); background: var(--card); overflow-x: auto; }
.nav-tab { padding: 9px 16px; border-radius: 8px 8px 0 0; background: transparent; border: none; color: var(--muted); cursor: pointer; font-family: 'Sarabun', sans-serif; font-size: 14px; font-weight: 500; transition: all .2s; border-bottom: 2px solid transparent; white-space: nowrap; }
.nav-tab:hover { color: var(--text); }
.nav-tab.active { color: var(--gold); border-bottom-color: var(--gold); background: rgba(240,192,64,.06); }

.page { display: none; padding: 20px; max-width: 920px; margin: 0 auto; }
.page.active { display: block; animation: fadeUp .3s ease; }
.page-title { font-family: 'Prompt', sans-serif; font-size: 21px; font-weight: 800; color: var(--gold); margin-bottom: 6px; }
.page-sub { color: var(--muted); font-size: 14px; margin-bottom: 22px; }

.part-label { font-family: 'Prompt', sans-serif; font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; margin: 22px 0 10px; padding-left: 4px; }

.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin-bottom: 4px; }
.subject-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; cursor: pointer; transition: all .2s; text-align: center; position: relative; }
.subject-card:hover { border-color: var(--gold); transform: translateY(-3px); box-shadow: 0 8px 24px rgba(240,192,64,.12); }
.subject-icon { font-size: 30px; margin-bottom: 10px; margin-top: 14px; }
.subject-name { font-family: 'Prompt', sans-serif; font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 4px; line-height: 1.4; }
.subject-count { font-size: 12px; color: var(--muted); }
.subject-score { position: absolute; top: 10px; right: 10px; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 8px; }
.part-badge { position: absolute; top: 10px; left: 10px; font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 6px; }

.quiz-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }
.quiz-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.badge { padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.badge-subject { background: rgba(79,195,247,.15); color: var(--accent); }
.badge-progress { background: rgba(240,192,64,.12); color: var(--gold); }
.badge-timer { background: rgba(231,76,60,.12); color: var(--red); }
.badge-part { background: rgba(155,89,182,.15); color: var(--purple); }

.progress-bar { height: 4px; background: var(--navy); border-radius: 2px; margin-bottom: 22px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--gold), var(--accent)); border-radius: 2px; transition: width .3s ease; }

.question-card { background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 28px; margin-bottom: 16px; }
.q-num { font-size: 12px; color: var(--muted); margin-bottom: 8px; font-weight: 500; }
.q-tags { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.q-tag { font-size: 11px; padding: 3px 9px; border-radius: 8px; font-weight: 600; }
.tag-year { background: rgba(79,195,247,.1); color: var(--accent); }
.tag-topic { background: rgba(155,89,182,.1); color: var(--purple); }
.tag-part { background: rgba(240,192,64,.1); color: var(--gold); }
/* pre-line: โจทย์หลายบรรทัดถูกเก็บเป็น \n ในฐานข้อมูล ถ้าไม่ตั้งค่านี้จะยุบเหลือบรรทัดเดียว
   โจทย์ที่ฝัง <table> ต้องเขียน markup ให้อยู่บรรทัดเดียว จะได้ไม่เกิดช่องว่างส่วนเกิน */
.q-text { font-size: 16px; line-height: 1.8; margin-bottom: 22px; white-space: pre-line; }
.q-table-wrap { overflow-x: auto; margin: 14px 0; }
.q-table { border-collapse: collapse; width: 100%; min-width: 320px; font-size: 14.5px; white-space: normal; font-variant-numeric: tabular-nums; }
.q-table caption { caption-side: top; text-align: left; color: var(--gold); font-family: 'Prompt', sans-serif; font-size: 14px; padding-bottom: 7px; }
.q-table th, .q-table td { border: 1px solid rgba(255,255,255,.14); padding: 7px 12px; text-align: right; }
.q-table th { background: rgba(240,192,64,.1); color: var(--gold); font-weight: 600; text-align: center; }
.q-table th:first-child, .q-table td:first-child { text-align: left; }
.q-table tbody tr:nth-child(even) { background: rgba(255,255,255,.025); }
.q-table tfoot td { border-top: 2px solid rgba(240,192,64,.35); font-weight: 700; }

.options { display: flex; flex-direction: column; gap: 9px; }
.option-btn { background: var(--navy); border: 1.5px solid rgba(255,255,255,.08); border-radius: 12px; padding: 13px 18px; text-align: left; cursor: pointer; color: var(--text); font-family: 'Sarabun', sans-serif; font-size: 15px; transition: all .18s; display: flex; align-items: flex-start; gap: 12px; }
.option-btn:hover:not(:disabled) { border-color: var(--gold); background: rgba(240,192,64,.06); }
.option-btn.selected { border-color: var(--gold); background: rgba(240,192,64,.1); }
.option-btn.correct { border-color: var(--green); background: rgba(46,204,113,.1); color: var(--green); }
.option-btn.wrong { border-color: var(--red); background: rgba(231,76,60,.1); color: var(--red); }
.option-btn:disabled { cursor: default; }
.opt-letter { width: 26px; height: 26px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; flex-shrink: 0; background: rgba(255,255,255,.07); margin-top: -1px; }
.explain-box { background: rgba(79,195,247,.07); border: 1px solid rgba(79,195,247,.2); border-radius: 12px; padding: 14px 16px; font-size: 14px; color: var(--accent); line-height: 1.8; margin-top: 14px; white-space: pre-line; }

.quiz-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
.btn { padding: 11px 22px; border-radius: 10px; border: none; cursor: pointer; font-family: 'Sarabun', sans-serif; font-size: 15px; font-weight: 600; transition: all .18s; }
.btn-primary { background: linear-gradient(135deg, var(--gold), #d4a017); color: var(--navy2); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(240,192,64,.3); }
.btn-secondary { background: var(--navy); border: 1px solid var(--border); color: var(--text); }
.btn-secondary:hover { border-color: var(--gold); }
.btn-danger { background: rgba(231,76,60,.1); border: 1px solid rgba(231,76,60,.3); color: var(--red); }
.btn-success { background: rgba(46,204,113,.1); border: 1px solid rgba(46,204,113,.3); color: var(--green); }
.btn-success:hover { background: rgba(46,204,113,.18); }

.result-hero { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 36px; text-align: center; margin-bottom: 20px; }
.result-score { font-family: 'Prompt', sans-serif; font-size: 80px; font-weight: 800; line-height: 1; }
.result-score.pass { color: var(--green); }
.result-score.fail { color: var(--red); }
.result-label { font-size: 16px; color: var(--muted); margin-top: 8px; }
.result-grade { display: inline-block; padding: 6px 20px; border-radius: 20px; font-size: 14px; font-weight: 700; margin-top: 16px; }
.grade-a { background: rgba(46,204,113,.15); color: var(--green); }
.grade-b { background: rgba(79,195,247,.15); color: var(--accent); }
.grade-c { background: rgba(240,192,64,.15); color: var(--gold); }
.grade-d { background: rgba(231,76,60,.15); color: var(--red); }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 22px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; text-align: center; }
.stat-num { font-family: 'Prompt', sans-serif; font-size: 28px; font-weight: 700; }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

.review-item { background: var(--card); border-radius: 14px; padding: 18px; margin-bottom: 10px; border-left: 4px solid var(--border); }
.review-item.correct-item { border-left-color: var(--green); }
.review-item.wrong-item { border-left-color: var(--red); }
.review-q { font-size: 15px; margin-bottom: 10px; line-height: 1.55; white-space: pre-line; }
.review-ans { font-size: 13px; display: flex; gap: 16px; flex-wrap: wrap; }
.your-ans { color: var(--red); }
.right-ans { color: var(--green); }

.stats-overall { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 26px; }
.stat-big { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; text-align: center; }
.stat-big .num { font-family: 'Prompt', sans-serif; font-size: 30px; font-weight: 800; }
.stat-big .lbl { font-size: 12px; color: var(--muted); margin-top: 4px; }

.history-table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 14px; overflow: hidden; border: 1px solid var(--border); }
.history-table th { background: var(--navy); padding: 11px 14px; font-size: 12px; font-weight: 700; color: var(--muted); text-align: left; border-bottom: 1px solid var(--border); }
.history-table td { padding: 11px 14px; font-size: 14px; border-bottom: 1px solid rgba(255,255,255,.04); }
.history-table tr:last-child td { border-bottom: none; }
.score-pill { padding: 3px 10px; border-radius: 10px; font-weight: 700; font-size: 13px; }

.bar-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.bar-label { font-size: 13px; color: var(--muted); width: 160px; text-align: right; flex-shrink: 0; line-height: 1.3; }
.bar-bg { flex: 1; height: 20px; background: var(--navy); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--gold), var(--accent)); border-radius: 4px; transition: width .8s ease; }
.bar-val { font-size: 13px; color: var(--gold); font-weight: 700; width: 38px; }

.admin-info { background: rgba(240,192,64,.08); border: 1px solid rgba(240,192,64,.2); border-radius: 12px; padding: 14px 18px; font-size: 14px; color: var(--gold); margin-bottom: 22px; }
.user-list { background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
.user-item { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid rgba(255,255,255,.04); }
.user-item:last-child { border-bottom: none; }
.user-info .uname { font-weight: 600; font-size: 15px; }
.user-info .urole { font-size: 12px; color: var(--muted); margin-top: 2px; }
.add-user-form { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.add-user-form input, .add-user-form select { flex: 1; min-width: 130px; padding: 10px 14px; background: var(--navy); border: 1px solid rgba(255,255,255,.1); border-radius: 8px; color: var(--text); font-family: 'Sarabun', sans-serif; font-size: 14px; }
.add-user-form input:focus, .add-user-form select:focus { outline: none; border-color: var(--gold); }
.btn-sm { padding: 10px 18px; font-size: 14px; }

.bank-section { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; margin: 20px 0; }
.bank-section h3 { font-family: 'Prompt', sans-serif; color: var(--gold); margin: 0; font-size: 17px; }
.bank-section-heading { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.bank-form-grid, .bank-filter-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.bank-form-grid input, .bank-form-grid select, .bank-form-grid textarea, .bank-filter-grid input, .bank-filter-grid select, .import-area { width: 100%; padding: 10px 12px; background: var(--navy); border: 1px solid rgba(255,255,255,.1); border-radius: 8px; color: var(--text); font-family: 'Sarabun', sans-serif; font-size: 14px; }
.bank-form-grid input:focus, .bank-form-grid select:focus, .bank-form-grid textarea:focus, .bank-filter-grid input:focus, .bank-filter-grid select:focus, .import-area:focus { outline: none; border-color: var(--gold); }
.bank-form-grid textarea { min-height: 84px; resize: vertical; }
.full-row { grid-column: 1 / -1; }
.check-label { display: flex; align-items: center; gap: 7px; color: var(--muted); font-size: 13px; padding: 8px 0; }
.check-label input { width: auto; }
.bank-table-wrap { overflow-x: auto; margin-top: 14px; }
.bank-table { width: 100%; border-collapse: collapse; min-width: 700px; font-size: 13px; }
.bank-table th, .bank-table td { text-align: left; padding: 10px; border-bottom: 1px solid rgba(255,255,255,.06); vertical-align: top; }
.bank-table th { color: var(--muted); font-weight: 600; }
.bank-table td { color: var(--text); }
.bank-table .question-summary { max-width: 330px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bank-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.bank-error { background: rgba(231,76,60,.13); color: #ff9d95; border: 1px solid rgba(231,76,60,.28); border-radius: 9px; padding: 10px 12px; }
.question-detail { white-space: pre-wrap; background: var(--navy); border: 1px solid var(--border); border-radius: 10px; padding: 14px; margin-top: 12px; color: var(--text); font-size: 14px; line-height: 1.6; }
.import-area { min-height: 170px; resize: vertical; margin: 12px 0; }
.import-result { color: var(--accent); margin: 10px 0 0; }
.stats-section { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px; margin: 18px 0; }
.stats-section h3 { font-family: 'Prompt', sans-serif; color: var(--gold); margin: 0 0 14px; font-size: 17px; }
.score-trend { min-height: 120px; display: flex; align-items: flex-end; gap: 8px; padding: 10px 2px 0; overflow-x: auto; }
.trend-item { min-width: 42px; flex: 1; max-width: 72px; text-align: center; color: var(--muted); font-size: 11px; }
.trend-bar-wrap { height: 86px; display: flex; align-items: flex-end; justify-content: center; }
.trend-bar { width: 100%; max-width: 44px; min-height: 3px; background: linear-gradient(180deg, var(--accent), var(--purple)); border-radius: 6px 6px 0 0; }
.attempt-status { display: inline-block; border-radius: 999px; padding: 3px 8px; font-size: 12px; font-weight: 700; background: rgba(79,195,247,.12); color: var(--accent); }
.stats-insights { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; color: var(--muted); font-size: 13px; }
.stats-insights span { background: rgba(79,195,247,.08); border: 1px solid rgba(79,195,247,.16); border-radius: 999px; padding: 6px 10px; }

@media (max-width: 720px) {
  .bank-form-grid, .bank-filter-grid { grid-template-columns: 1fr; }
  .full-row { grid-column: auto; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .subject-grid { grid-template-columns: 1fr 1fr; }
  .login-box { padding: 30px 20px; }
  .quiz-actions { flex-wrap: wrap; }
  .quiz-actions .btn { flex: 1; }
  .bar-label { width: 110px; font-size: 12px; }
}

/* Real Exam Promo Banner */
.real-exam-promo-banner {
  background: linear-gradient(135deg, rgba(240, 192, 64, 0.08) 0%, rgba(79, 195, 247, 0.08) 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 28px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}
.real-exam-promo-banner:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(240, 192, 64, 0.15);
  background: linear-gradient(135deg, rgba(240, 192, 64, 0.12) 0%, rgba(79, 195, 247, 0.12) 100%);
}
.real-exam-promo-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--gold), var(--accent));
}
.promo-badge {
  background: linear-gradient(135deg, var(--gold), #d4a017);
  color: var(--navy2);
  font-family: 'Prompt', sans-serif;
  font-size: 10px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 6px;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}
.promo-body h3 {
  font-family: 'Prompt', sans-serif;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}
.promo-body p {
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.4;
}
.promo-action {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gold);
  font-family: 'Prompt', sans-serif;
  font-size: 14px;
  font-weight: 700;
}
.promo-action svg {
  transition: transform 0.2s ease;
}
.real-exam-promo-banner:hover .promo-action svg {
  transform: translateX(4px);
}
@media (max-width: 600px) {
  .real-exam-promo-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .promo-action {
    width: 100%;
    justify-content: flex-end;
  }
}