/* ═══════════════════════════════════════════
   EXAM DOCUMENT PROTECTION SYSTEM
   Modern Clean Design — Light & Dark Mode
   ═══════════════════════════════════════════ */

/* ── Dark Mode (default) ── */
:root {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.06);
  --bg-input: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.08);
  --border-focus: #6366f1;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-glow: rgba(99,102,241,0.25);
  --accent-soft: rgba(99,102,241,0.12);
  --gold: #f59e0b;
  --red: #ef4444;
  --green: #22c55e;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 10px;
  --radius-lg: 14px;
  --font: 'Noto Sans Thai','Inter',system-ui,sans-serif;
  --transition: 0.2s ease;
}

/* ── Light Mode ── */
[data-theme="light"] {
  --bg-primary: #f5f6fa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(0,0,0,0.015);
  --bg-card-hover: rgba(0,0,0,0.04);
  --bg-input: #f0f1f5;
  --border: rgba(0,0,0,0.12);
  --border-focus: #6366f1;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --accent: #6366f1;
  --accent-glow: rgba(99,102,241,0.18);
  --accent-soft: rgba(99,102,241,0.08);
  --shadow: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
}

/* ── Reset ── */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

/* ── Anti-Copy (conditional) ── */
body.viewing.copy-blocked,
body.viewing.copy-blocked * {
  -webkit-user-select: none !important;
  -moz-user-select: none !important;
  -ms-user-select: none !important;
  user-select: none !important;
  -webkit-touch-callout: none !important;
}
body.viewing.copy-blocked .textLayer,
body.viewing.copy-blocked .textLayer * {
  -webkit-user-select: none !important;
  -moz-user-select: none !important;
  -ms-user-select: none !important;
  user-select: none !important;
  pointer-events: none !important; /* ป้องกันการคลุมดำ/ไฮไลต์ ใน PDF.js */
}
@media print {
  body.copy-blocked { display: none !important; }
  body.copy-blocked ~ *::after {
    content: "การพิมพ์ถูกปิดใช้งาน"; display: block; padding: 40px; font-size: 24px; text-align: center;
  }
}

/* ── Pages ── */
.page { display: none; height: 100vh; }
.page.active { display: flex; animation: fadeIn 0.25s ease-out; }

/* ── Copy Shield ── */
.copy-shield { position: fixed; top:0; left:0; width:100%; height:100%; z-index:9998; pointer-events:none; }

/* ── Blur Overlay ── */
.blur-overlay {
  position: fixed; top:0; left:0; width:100%; height:100%;
  background: rgba(0,0,0,0.85); backdrop-filter: blur(20px);
  z-index: 10000; display: none; justify-content: center; align-items: center;
}
.blur-overlay.active { display: flex; }
.blur-message { text-align: center; animation: pulse 2s infinite; }
.blur-icon { font-size: 56px; margin-bottom: 12px; }
.blur-message h2 { font-size: 24px; margin-bottom: 6px; }
.blur-message p { color: var(--text-secondary); }

/* ── Glass Card ── */
.glass-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.glass-bar {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
}

/* ═══════════════════════════════════════════
   THEME TOGGLE
   ═══════════════════════════════════════════ */
.theme-toggle {
  position: fixed; bottom: 20px; right: 20px; z-index: 9999;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg-secondary); border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; transition: var(--transition);
}
.theme-toggle:hover { transform: scale(1.1); box-shadow: 0 0 20px var(--accent-glow); }

/* ═══════════════════════════════════════════
   LOGIN PAGE
   ═══════════════════════════════════════════ */
.login-bg {
  width: 100%; height: 100vh;
  background: var(--bg-primary);
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.login-bg::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, var(--accent-glow) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(245,158,11,0.06) 0%, transparent 50%);
  animation: bgShift 20s ease-in-out infinite;
}
@keyframes bgShift { 0%,100%{transform:translate(0)} 50%{transform:translate(-3%,2%)} }

.login-container { position: relative; z-index: 2; width: 100%; max-width: 400px; padding: 20px; }
.login-card { padding: 36px 28px; }
.login-header { text-align: center; margin-bottom: 28px; }
.logo-circle {
  width: 64px; height: 64px; margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--accent), #818cf8);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 24px var(--accent-glow);
}
.logo-icon { font-size: 28px; }
.login-header h1 { font-size: 20px; font-weight: 700; }
.subtitle { color: var(--text-secondary); font-size: 13px; margin-top: 2px; }
.university-name { color: var(--gold); font-size: 12px; font-weight: 500; margin-top: 6px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; font-weight: 600; color: var(--text-secondary); margin-bottom: 5px; text-transform: uppercase; letter-spacing: 0.3px; }
.input-wrapper {
  display: flex; align-items: center;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); transition: var(--transition);
}
.input-wrapper:focus-within { border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--accent-glow); }
.input-icon { padding: 0 10px; font-size: 14px; opacity: 0.5; }
.input-wrapper input {
  flex: 1; background: none; border: none; color: var(--text-primary);
  padding: 11px 12px 11px 0; font-size: 14px; font-family: var(--font); outline: none;
}
.input-wrapper input::placeholder { color: var(--text-muted); }
input[type="text"], input[type="number"], input[type="date"], input[type="time"],
select, textarea {
  width: 100%; background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text-primary); padding: 10px 12px;
  font-size: 14px; font-family: var(--font); outline: none; transition: var(--transition);
}
input:focus, select:focus, textarea:focus { border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--accent-glow); }
.form-select { appearance: none; cursor: pointer; }
.form-textarea { resize: vertical; min-height: 100px; }

/* ── Toggle Switch ── */
.toggle-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.toggle-row label { margin: 0; text-transform: none; font-weight: 500; font-size: 13px; color: var(--text-primary); }
.shield-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 20px; }
.toggle { position: relative; width: 42px; height: 24px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle .slider {
  position: absolute; cursor: pointer; inset: 0;
  background: var(--border); border-radius: 24px; transition: var(--transition);
}
.toggle .slider::before {
  content: ''; position: absolute; height: 18px; width: 18px; left: 3px; bottom: 3px;
  background: white; border-radius: 50%; transition: var(--transition);
}
.toggle input:checked + .slider { background: var(--accent); }
.toggle input:checked + .slider::before { transform: translateX(18px); }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 5px;
  padding: 9px 18px; border: none; border-radius: var(--radius); cursor: pointer;
  font-size: 13px; font-weight: 600; font-family: var(--font);
  transition: var(--transition); outline: none;
}
.btn-primary { background: var(--accent); color: white; box-shadow: 0 2px 12px var(--accent-glow); }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-outline:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.btn-danger { background: var(--red); color: white; }
.btn-danger:hover { opacity: 0.85; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-block { width: 100%; }
.btn-icon {
  width: 34px; height: 34px; padding: 0; border-radius: 8px;
  background: var(--bg-input); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.btn-icon:hover { background: var(--bg-card-hover); }
.login-divider { text-align: center; margin: 18px 0; position: relative; color: var(--text-muted); font-size: 12px; }
.login-divider::before, .login-divider::after {
  content: ''; position: absolute; top: 50%; width: 40%; height: 1px; background: var(--border);
}
.login-divider::before { left: 0; } .login-divider::after { right: 0; }
.error-message {
  background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2);
  color: var(--red); padding: 10px 12px; border-radius: var(--radius);
  font-size: 13px; margin-bottom: 14px;
}

/* ═══════════════════════════════════════════
   VIEWER PAGE
   ═══════════════════════════════════════════ */
.viewer-layout { width: 100%; height: 100vh; display: flex; flex-direction: column; background: var(--bg-primary); }
.viewer-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px; border-bottom: 1px solid var(--border); flex-shrink: 0; z-index: 100;
  background: var(--bg-secondary);
}
.toolbar-left,.toolbar-center,.toolbar-right { display: flex; align-items: center; gap: 8px; }
.toolbar-divider { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.exam-title-text { font-size: 13px; font-weight: 600; color: var(--text-secondary); max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.page-indicator { display: flex; align-items: center; gap: 4px; }
.page-input {
  width: 44px; text-align: center; background: var(--bg-input);
  border: 1px solid var(--border); border-radius: 6px;
  color: var(--text-primary); padding: 4px; font-size: 13px; font-family: var(--font);
}
.page-separator { color: var(--text-muted); }
.zoom-text { font-size: 12px; color: var(--text-secondary); min-width: 40px; text-align: center; }
.session-timer {
  display: flex; align-items: center; gap: 5px;
  background: var(--accent-soft); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 20px; font-size: 12px; color: var(--accent);
}
.session-timer.warning { background: rgba(239,68,68,0.08); color: var(--red); }

.viewer-canvas-container {
  flex: 1; overflow: auto; display: flex; justify-content: center;
  align-items: flex-start; padding: 20px; position: relative;
  background: var(--bg-primary);
  overflow-y: auto;
}
.scroll-viewer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
}
.scroll-page {
  width: 100%;
  max-width: 900px;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.scroll-page-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.page-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 13px;
  padding: 60px 0;
}
.page-placeholder.error { color: var(--danger); }
.page-placeholder.locked {
  background: rgba(255,165,0,0.06);
  border: 2px dashed rgba(255,165,0,0.3);
  border-radius: 12px;
  padding: 60px 20px;
  color: var(--text-secondary);
}
.spinner-small {
  width: 24px; height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.page-loading { position: absolute; top:50%; left:50%; transform: translate(-50%,-50%); text-align: center; color: var(--text-secondary); display: none; }
.page-loading.active { display: block; }
.spinner { width: 36px; height: 36px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 10px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* PDF Text Mode */
#pdfContainer { position: relative; }
.pdf-watermark-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  pointer-events: none;
  z-index: 100;
  overflow: hidden;
}

/* PDF.js rendered pages */
.pdf-page-wrapper {
  margin: 0 auto;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}
.pdf-page-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewer-statusbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 5px 16px; border-top: 1px solid var(--border);
  font-size: 11px; color: var(--text-muted); flex-shrink: 0;
  background: var(--bg-secondary); gap: 12px;
}
.status-shield { color: var(--green); }

/* ═══════════════════════════════════════════
   ADMIN PAGE
   ═══════════════════════════════════════════ */
.admin-layout { width: 100%; height: 100vh; display: flex; }
.admin-sidebar {
  width: 220px; flex-shrink: 0; display: flex; flex-direction: column;
  padding: 16px 10px; border-right: 1px solid var(--border);
  background: var(--bg-secondary);
}
.sidebar-header { text-align: center; padding: 6px 0 18px; }
.logo-small { font-size: 24px; }
.sidebar-header h2 { font-size: 14px; font-weight: 700; margin-top: 4px; }
.sidebar-nav { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex; align-items: center; gap: 8px; padding: 9px 12px;
  background: none; border: none; border-radius: var(--radius); color: var(--text-secondary);
  font-size: 13px; font-family: var(--font); cursor: pointer; text-align: left;
  transition: var(--transition);
}
.nav-item:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.nav-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.sidebar-logout { margin-top: auto; }

.admin-content { flex: 1; overflow-y: auto; padding: 24px 28px; background: var(--bg-primary); }
.admin-content h2 { font-size: 20px; font-weight: 700; margin-bottom: 18px; }
.admin-tab { display: none; }
.admin-tab.active { display: block; }

/* ── Stats ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 14px; }
.stat-card { padding: 18px; text-align: center; }
.stat-icon { font-size: 24px; margin-bottom: 6px; }
.stat-value { font-size: 28px; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* ── Cards & Tables ── */
.card { padding: 20px; }
.card h3 { font-size: 15px; font-weight: 600; margin-bottom: 14px; }
.mt-4 { margin-top: 18px; }
.mb-2 { margin-bottom: 10px; }
.ml-2 { margin-left: 10px; }
.text-muted { color: var(--text-muted); font-size: 13px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.flex-1 { flex: 1; min-width: 180px; }

.table-container { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 8px 10px; color: var(--text-secondary); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: 0.3px; border-bottom: 1px solid var(--border); }
td { padding: 9px 10px; border-bottom: 1px solid var(--border); }
tr:hover td { background: var(--bg-card-hover); }

.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; }
.badge-blue { background: var(--accent-soft); color: var(--accent); }
.badge-gold { background: rgba(245,158,11,0.1); color: var(--gold); }
.badge-red { background: rgba(239,68,68,0.1); color: var(--red); }
.badge-green { background: rgba(34,197,94,0.1); color: var(--green); }

/* ── File Upload ── */
.file-upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius-lg);
  padding: 28px; text-align: center; cursor: pointer; transition: var(--transition);
}
.file-upload-area:hover { border-color: var(--accent); background: var(--accent-soft); }
.file-upload-area p { color: var(--text-secondary); margin-bottom: 4px; }

/* ── Session List ── */
.session-list .session-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px; border-radius: var(--radius); margin-bottom: 4px;
  background: rgba(34,197,94,0.04); border: 1px solid rgba(34,197,94,0.1);
}

/* ═══════════════════════════════════════════
   MODAL
   ═══════════════════════════════════════════ */
.modal-overlay {
  position: fixed; top:0; left:0; width:100%; height:100%;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(6px);
  z-index: 10000; display: flex; align-items: flex-start; justify-content: center;
  overflow-y: auto; padding: 24px 0;
  animation: fadeIn 0.15s ease-out;
}
.modal-content {
  width: 100%; max-width: 460px; padding: 24px 28px; margin: 16px;
  max-height: none;
}
.modal-content h3 { font-size: 17px; font-weight: 700; margin-bottom: 18px; }

/* ═══════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════ */
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.7} }
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .admin-content { padding: 20px; }
  .admin-sidebar { width: 200px; }
}
@media (max-width: 768px) {
  .admin-layout { flex-direction: column; }
  .admin-sidebar {
    width: 100%; flex-direction: row; padding: 6px 8px; overflow-x: auto;
    border-right: none; border-bottom: 1px solid var(--border);
  }
  .sidebar-header { display: none; }
  .sidebar-nav { flex-direction: row; gap: 2px; }
  .nav-item { padding: 7px 10px; white-space: nowrap; font-size: 12px; }
  .sidebar-logout { margin-top: 0; margin-left: auto; }
  .admin-content { padding: 14px; }
  .admin-content h2 { font-size: 17px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { flex-direction: column; }
  .toolbar-center { gap: 4px; }
  .exam-title-text { display: none; }
  .viewer-toolbar { padding: 6px 8px; flex-wrap: wrap; gap: 6px; justify-content: center; }
  .toolbar-left { margin-right: auto; }
  .toolbar-right { margin-left: auto; }
  .login-card { padding: 28px 20px; }
  .card { padding: 16px; }
  .modal-content { padding: 20px; }
  table { font-size: 12px; }
  th, td { padding: 7px 6px; }
  .viewer-statusbar { flex-wrap: wrap; padding: 6px 12px; gap: 6px; justify-content: center; }
  #statusGroup { display: none; } /* ซ่อนชื่อคณะ/กลุ่ม บนมือถือเพื่อประหยัดพื้นที่ */
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-card { padding: 12px; }
  .stat-value { font-size: 22px; }
  .login-container { padding: 12px; }
  .exam-cards-grid { grid-template-columns: 1fr !important; }
  .btn-icon { width: 30px; height: 30px; font-size: 12px; }
  .zoom-text { min-width: 34px; font-size: 11px; }
  .viewer-statusbar { font-size: 10px; }
  #statusUser { max-width: 120px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
}

/* ── Exam Cards Grid ── */
.exam-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.exam-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}
.exam-card-item:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-glow);
}
.exam-card-item.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.exam-card-item h4 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--text-primary);
}
.exam-card-item .exam-card-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
}

/* ═══════ EXAM SELECTION PAGE ═══════ */
#examSelectPage { overflow-y: auto; }
.exam-select-layout {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}
.exam-select-header {
  text-align: center;
  margin-bottom: 32px;
}
.exam-select-header h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 8px;
}
.exam-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}
.exam-select-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.exam-select-card.disabled-card {
  opacity: 0.6;
  cursor: not-allowed;
  background: var(--bg-secondary);
}
.exam-select-card.disabled-card:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--border);
}
.exam-select-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--accent), #a855f7);
}
.exam-select-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(99,102,241,0.15);
}
.exam-select-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 12px;
}
.exam-select-card .card-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}
.exam-select-card .card-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.exam-select-card .card-action {
  margin-top: 16px;
  text-align: center;
}
.exam-select-card .card-action .btn {
  width: 100%;
}

/* ═══════════════════════════════════════════
   PRINT PROTECTION — ซ่อนเนื้อหาเมื่อสั่งพิมพ์
   ═══════════════════════════════════════════ */
@media print {
  /* ซ่อนเนื้อหาของระบบ */
  body > *:not(.print-warning-banner) {
    display: none !important;
  }
  
  /* แสดงกล่องเตือนที่เราสร้างขึ้นด้วย JS */
  .print-warning-banner {
    display: flex !important;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100vw; height: 100vh;
    background-color: white;
    z-index: 999999 !important;
    text-align: center;
  }
}

/* ── Pagination & Filter ── */
.pagination-wrapper { display: flex; justify-content: flex-end; align-items: center; gap: 4px; margin-top: 15px; }
.page-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-secondary);
}
.page-btn:hover:not(:disabled) { background: var(--bg-card-hover); color: var(--accent); }
.page-btn.active { background: var(--accent); color: white; border-color: var(--accent); }
.page-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.filter-controls { display: flex; gap: 10px; align-items: center; }
.filter-controls .form-control { padding: 6px 10px; font-size: 13px; height: auto; }