/* styles/exam.css - Modern Design System for Examination Portal & Teacher Dashboard */
@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Space+Grotesk:wght@400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

:root {
  --navy-deep: #050a1f;
  --navy-mid: #0b1338;
  --navy-card: #101a4c;
  --navy-glow: #1a2a7a;
  
  --gold-bright: #ffe08a;
  --gold-core: #f4c744;
  --gold-deep: #c98a1d;
  
  --blue-primary: #2f5fff;
  --blue-light: #5e84ff;
  --blue-glow: rgba(47, 95, 255, 0.35);
  
  --green-correct: #28c76f;
  --green-bg: rgba(40, 199, 111, 0.15);
  --red-wrong: #ef3f4f;
  --red-bg: rgba(239, 63, 79, 0.15);
  --amber-warn: #ff9f43;
  --amber-bg: rgba(255, 159, 67, 0.15);
  
  --text-main: #eef1ff;
  --text-soft: #aab3d6;
  --text-faint: #6f7aab;
  --border-line: rgba(244, 199, 68, 0.22);
  --border-subtle: rgba(255, 255, 255, 0.1);
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(ellipse at 50% -10%, var(--navy-glow) 0%, var(--navy-mid) 40%, var(--navy-deep) 85%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  overflow-x: hidden;
}

/* Ambient light effect */
.bg-rays {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: repeating-conic-gradient(from 0deg at 50% 10%, rgba(244, 199, 68, 0.035) 0deg 3deg, transparent 3deg 10deg);
  mix-blend-mode: screen;
}

/* App Header */
.app-header {
  position: relative; z-index: 10;
  background: rgba(11, 19, 56, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--gold-bright), var(--gold-deep));
  color: #1a0f00;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 20px;
  box-shadow: 0 4px 16px rgba(244, 199, 68, 0.35);
}

.brand-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 18px;
  letter-spacing: 0.02em;
  background: linear-gradient(180deg, var(--gold-bright), var(--gold-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-link {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-line);
}

/* Layout container */
.container {
  position: relative; z-index: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px 40px;
  flex: 1;
}

/* Buttons */
.btn {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 14.5px;
  border: none;
  border-radius: 999px;
  padding: 11px 22px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease, background 0.15s ease;
  text-decoration: none;
}

.btn:hover:not(:disabled) { transform: translateY(-2px); }
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-primary {
  background: linear-gradient(180deg, #6485ff, var(--blue-primary));
  color: #ffffff;
  box-shadow: 0 6px 20px var(--blue-glow);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-gold {
  background: linear-gradient(180deg, var(--gold-bright), var(--gold-deep));
  color: #201200;
  font-weight: 800;
  box-shadow: 0 8px 24px rgba(244, 199, 68, 0.35);
}

.btn-gold:hover:not(:disabled) { filter: brightness(1.08); box-shadow: 0 10px 28px rgba(244, 199, 68, 0.45); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: #dbe1ff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--gold-core);
}

.btn-danger {
  background: rgba(239, 63, 79, 0.2);
  color: #ff8e97;
  border: 1px solid rgba(239, 63, 79, 0.4);
}
.btn-danger:hover:not(:disabled) {
  background: var(--red-wrong);
  color: white;
}

.btn-success {
  background: linear-gradient(180deg, #32dc7d, var(--green-correct));
  color: #052610;
  font-weight: 800;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  border-radius: 8px;
}

/* Glass Panels */
.panel {
  background: linear-gradient(180deg, rgba(16, 26, 76, 0.75), rgba(11, 19, 56, 0.85));
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  margin-bottom: 24px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: 20px;
  color: var(--gold-core);
}

.panel-desc {
  font-size: 13.5px;
  color: var(--text-soft);
  margin-top: 4px;
}

/* Stats Cards Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.stat-card {
  background: rgba(5, 10, 31, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute; top: 0; left: 0; width: 4px; height: 100%;
  background: var(--blue-primary);
}
.stat-card.gold::before { background: var(--gold-core); }
.stat-card.green::before { background: var(--green-correct); }
.stat-card.amber::before { background: var(--amber-warn); }
.stat-card.red::before { background: var(--red-wrong); }

.stat-num {
  font-family: 'Space Mono', monospace;
  font-size: 26px;
  font-weight: 700;
  color: #ffffff;
}

.stat-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

/* Badges and Pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.badge-in-progress {
  background: var(--amber-bg);
  color: #ffb774;
  border: 1px solid rgba(255, 159, 67, 0.4);
}

.badge-completed {
  background: var(--green-bg);
  color: #4eed98;
  border: 1px solid rgba(40, 199, 111, 0.4);
}

.badge-dnf {
  background: var(--red-bg);
  color: #ff7683;
  border: 1px solid rgba(239, 63, 79, 0.4);
}

.badge-blue {
  background: rgba(47, 95, 255, 0.15);
  color: #9cb5ff;
  border: 1px solid rgba(47, 95, 255, 0.4);
}

/* Pulsing radar dot for live active students */
.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #ff9f43;
  box-shadow: 0 0 0 rgba(255, 159, 67, 0.7);
  animation: pulse-ring 1.5s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 159, 67, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 7px rgba(255, 159, 67, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 159, 67, 0); }
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13.5px;
}

.custom-table th {
  background: rgba(5, 10, 31, 0.75);
  color: var(--gold-bright);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-line);
}

.custom-table td {
  padding: 13px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(16, 26, 76, 0.4);
}

.custom-table tr:hover td {
  background: rgba(47, 95, 255, 0.12);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold-bright);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  background: rgba(5, 10, 31, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: #ffffff;
  font-family: inherit;
  font-size: 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--gold-core);
  box-shadow: 0 0 0 3px rgba(244, 199, 68, 0.2);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.form-check {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 13.5px;
  user-select: none;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  accent-color: var(--gold-core);
  width: 18px; height: 18px;
  cursor: pointer;
}

/* Question Editor Cards */
.q-card {
  background: rgba(5, 10, 31, 0.55);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 14px;
  position: relative;
  transition: border-color 0.2s ease;
}

.q-card:hover {
  border-color: rgba(244, 199, 68, 0.4);
}

.q-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.q-badge-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--gold-core);
  color: #1a0f00;
  font-weight: 800; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}

/* Invite Code Display Box */
.invite-box {
  background: linear-gradient(135deg, rgba(47, 95, 255, 0.15), rgba(244, 199, 68, 0.1));
  border: 1.5px dashed var(--gold-core);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 20px;
}

.invite-code-text {
  font-family: 'Space Mono', monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--gold-bright);
  letter-spacing: 0.1em;
}

.invite-url-text {
  font-size: 12.5px;
  color: var(--text-soft);
  word-break: break-all;
}

/* Student Examination UI */
.exam-briefing-card {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 36px 28px;
}

.exam-main-title {
  font-family: 'Archivo Black', sans-serif;
  font-size: clamp(24px, 4vw, 36px);
  background: linear-gradient(180deg, var(--gold-bright), var(--gold-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
}

.exam-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.exam-info-item {
  background: rgba(5, 10, 31, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
}

.exam-info-item .val {
  font-family: 'Space Mono', monospace;
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-bright);
}

.exam-info-item .lbl {
  font-size: 11px;
  color: var(--text-soft);
  text-transform: uppercase;
  margin-top: 2px;
}

.exam-instructions-box {
  background: rgba(5, 10, 31, 0.45);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-align: left;
  font-size: 13.5px;
  color: var(--text-soft);
  white-space: pre-wrap;
  margin-bottom: 24px;
  max-height: 200px;
  overflow-y: auto;
}

/* Exam In-Progress HUD */
.exam-hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  background: rgba(11, 19, 56, 0.9);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin-bottom: 20px;
  position: sticky;
  top: 14px;
  z-index: 20;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.timer-box {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Mono', monospace;
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-bright);
  background: rgba(5, 10, 31, 0.7);
  border: 1px solid var(--border-line);
  border-radius: 999px;
  padding: 6px 16px;
}

.timer-box.warning {
  color: #ff5466;
  border-color: var(--red-wrong);
  animation: pulse-ring 1s infinite;
}

/* Page Leaves Counter HUD Box */
.leaves-monitor-box {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 700;
  border-radius: 999px;
  padding: 6px 16px;
  background: rgba(5, 10, 31, 0.7);
  border: 1px solid var(--border-subtle);
  transition: all 0.25s ease;
}

.leaves-monitor-box.normal {
  color: #c4d0ff;
  border-color: rgba(94, 132, 255, 0.3);
}

.leaves-monitor-box.normal .leave-num {
  color: #72e0a2;
  font-family: 'Space Mono', monospace;
  font-size: 16px;
}

.leaves-monitor-box.warning {
  color: #ffd08a;
  border-color: var(--amber-warn);
  background: rgba(255, 159, 67, 0.15);
  box-shadow: 0 0 12px rgba(255, 159, 67, 0.25);
}

.leaves-monitor-box.warning .leave-num {
  color: #ffaa3b;
  font-family: 'Space Mono', monospace;
  font-size: 16px;
  font-weight: 800;
}

.leaves-monitor-box.flagged {
  color: #ff8e97;
  border-color: var(--red-wrong);
  background: rgba(239, 63, 79, 0.2);
  box-shadow: 0 0 16px rgba(239, 63, 79, 0.35);
  animation: pulse-ring 1.5s infinite;
}

.leaves-monitor-box.flagged .leave-num {
  color: #ff4757;
  font-family: 'Space Mono', monospace;
  font-size: 16px;
  font-weight: 800;
}

/* Page Leave Status Badges */
.badge-leave-normal {
  background: rgba(40, 199, 111, 0.16);
  border: 1px solid rgba(40, 199, 111, 0.4);
  color: #28c76f;
  font-weight: 700;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-leave-warning {
  background: rgba(255, 159, 67, 0.2);
  border: 1px solid rgba(255, 159, 67, 0.55);
  color: #ff9f43;
  font-weight: 700;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-leave-flagged {
  background: rgba(239, 63, 79, 0.25);
  border: 1px solid rgba(239, 63, 79, 0.6);
  color: #ff5e6d;
  font-weight: 800;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 0 10px rgba(239, 63, 79, 0.2);
}

/* Page Leave Log Timeline */
.leave-log-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 13px;
}

.leave-log-table th {
  background: rgba(11, 19, 56, 0.85);
  color: var(--gold-bright);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-line);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.leave-log-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-main);
}

.leave-log-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

.leave-note-banner {
  background: rgba(47, 95, 255, 0.12);
  border: 1px solid rgba(94, 132, 255, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 12.5px;
  color: var(--text-soft);
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Question Navigation Strip */
.q-nav-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.q-nav-btn {
  width: 38px; height: 38px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-soft);
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s ease;
}

.q-nav-btn:hover {
  border-color: var(--gold-core);
  color: #ffffff;
}

.q-nav-btn.active {
  background: linear-gradient(135deg, var(--gold-bright), var(--gold-deep));
  color: #1a0f00;
  border-color: var(--gold-bright);
  box-shadow: 0 0 12px rgba(244, 199, 68, 0.4);
}

.q-nav-btn.answered {
  background: rgba(47, 95, 255, 0.3);
  border-color: var(--blue-light);
  color: #ffffff;
}

/* Student Question Presentation */
.student-q-card {
  background: linear-gradient(180deg, rgba(16, 26, 76, 0.8), rgba(11, 19, 56, 0.9));
  border: 1.5px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.student-q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.student-q-type {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold-core);
}

.student-q-points {
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  color: var(--text-soft);
}

.student-q-text {
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 22px;
}

/* Option Choices */
.student-opt-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 640px) {
  .student-opt-grid { grid-template-columns: 1fr; }
}

.student-opt-item {
  background: rgba(255, 255, 255, 0.045);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.student-opt-item:hover {
  background: rgba(244, 199, 68, 0.08);
  border-color: var(--gold-core);
}

.student-opt-item.selected {
  background: rgba(47, 95, 255, 0.22);
  border-color: var(--blue-light);
  box-shadow: 0 0 16px var(--blue-glow);
}

.opt-letter-badge {
  width: 26px; height: 26px; border-radius: 50%;
  background: rgba(244, 199, 68, 0.15);
  color: var(--gold-core);
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* Matching UI */
.matching-pair-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 14px;
  align-items: center;
  background: rgba(5, 10, 31, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 10px;
}

@media (max-width: 600px) {
  .matching-pair-row { grid-template-columns: 1fr; }
}

.matching-term {
  font-weight: 600;
  font-size: 14.5px;
  color: var(--gold-bright);
}

/* Result Screen */
.result-card {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 36px 24px;
}

.result-badge-status {
  display: inline-block;
  font-family: 'Archivo Black', sans-serif;
  font-size: 28px;
  padding: 8px 24px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.result-badge-status.pass {
  background: var(--green-bg);
  color: #32dc7d;
  border: 2px solid var(--green-correct);
  box-shadow: 0 0 30px rgba(40, 199, 111, 0.3);
}

.result-badge-status.fail {
  background: var(--red-bg);
  color: #ff5466;
  border: 2px solid var(--red-wrong);
  box-shadow: 0 0 30px rgba(239, 63, 79, 0.3);
}

.result-score-big {
  font-family: 'Archivo Black', sans-serif;
  font-size: clamp(48px, 8vw, 76px);
  background: linear-gradient(180deg, var(--gold-bright), var(--gold-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin: 10px 0 20px;
}

/* Modal Popup */
.modal-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(5, 10, 31, 0.85);
  backdrop-filter: blur(10px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1; pointer-events: auto;
}

.modal-content {
  background: var(--navy-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 680px;
  max-height: 88vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
  transform: translateY(15px);
  transition: transform 0.2s ease;
}

.modal-overlay.open .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

/* Toast Notifications */
.toast-msg {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--navy-mid);
  border: 1.5px solid var(--gold-core);
  color: var(--gold-bright);
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  z-index: 2000;
  opacity: 0; pointer-events: none;
  transition: all 0.25s ease;
}

.toast-msg.show {
  opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0);
}

/* Developer Footer */
.dev-footer {
  position: relative; z-index: 5;
  padding: 20px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; text-align: center;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.dev-avatar-wrap {
  width: 48px; height: 48px; border-radius: 50%;
  padding: 2px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.4), rgba(40, 199, 111, 0.7));
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  margin-bottom: 4px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}

.dev-avatar {
  width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
}

.dev-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 14px;
  letter-spacing: 0.06em; color: #ffffff;
  text-transform: uppercase;
}

.dev-role {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 11px;
  letter-spacing: 0.16em; color: var(--green-correct);
  text-transform: uppercase;
}

/* ============================================================ */
/* XEPTO LMS EMBEDDED FRAME & SECURE PROCTORING CONTAINER */
/* ============================================================ */
.xepto-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 140px);
  min-height: 600px;
  background: var(--navy-mid);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.xepto-toolbar {
  background: rgba(5, 10, 31, 0.95);
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.xepto-frame {
  width: 100%;
  flex: 1;
  border: none;
  background: #ffffff;
  min-height: 520px;
}

.xepto-fallback-card {
  margin: 30px auto;
  max-width: 680px;
  background: rgba(5, 10, 31, 0.85);
  border: 1.5px solid var(--gold-core);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5);
}

/* Proctoring Telemetry Badges */
.badge-conn-online {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  background: var(--green-bg);
  color: #32dc7d;
  border: 1px solid rgba(40, 199, 111, 0.4);
}

.badge-conn-away {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  background: var(--red-bg);
  color: #ff8e97;
  border: 1px solid rgba(239, 63, 79, 0.5);
  animation: pulse-red-border 1.5s infinite;
}

.badge-conn-idle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  background: var(--amber-bg);
  color: #ffb774;
  border: 1px solid rgba(255, 159, 67, 0.4);
}

.badge-conn-submitted {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  background: rgba(47, 95, 255, 0.15);
  color: #8da9ff;
  border: 1px solid rgba(47, 95, 255, 0.35);
}

.away-pulse-beacon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--red-wrong);
  box-shadow: 0 0 10px var(--red-wrong);
  display: inline-block;
  animation: pulse-ring 1s infinite;
}

@keyframes pulse-red-border {
  0% { box-shadow: 0 0 0 0 rgba(239, 63, 79, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(239, 63, 79, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 63, 79, 0); }
}

.btn-xepto {
  background: linear-gradient(135deg, #00d2ff 0%, #0066ff 100%);
  color: #ffffff;
  font-weight: 800;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 6px 20px rgba(0, 150, 255, 0.4);
}
.btn-xepto:hover:not(:disabled) {
  filter: brightness(1.12);
  box-shadow: 0 8px 24px rgba(0, 150, 255, 0.55);
}

.security-disclosure-box {
  background: rgba(16, 26, 76, 0.65);
  border: 1px solid rgba(47, 95, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 13px;
  color: var(--text-soft);
  line-height: 1.5;
  margin-top: 18px;
}

/* ============================================================ */
/* MOBILE & TABLET RESPONSIVE ENHANCEMENTS (ANDROID & iOS)     */
/* ============================================================ */
@media (max-width: 768px) {
  /* Prevent browser auto-zoom on input focus */
  input[type="text"],
  input[type="url"],
  input[type="number"],
  input[type="email"],
  select,
  textarea {
    font-size: 16px !important;
  }

  .container {
    padding: 14px 10px 30px;
  }

  .app-header {
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .brand-title {
    font-size: 16px;
  }

  .brand-icon {
    width: 34px;
    height: 34px;
    font-size: 17px;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-top: 4px;
  }

  .nav-link {
    font-size: 12.5px;
    padding: 6px 12px;
    white-space: nowrap;
  }

  /* Buttons on Mobile */
  .btn {
    min-height: 44px;
    padding: 10px 18px;
    font-size: 14px;
    touch-action: manipulation;
  }

  .btn-sm {
    min-height: 36px;
    padding: 6px 12px;
    font-size: 12px;
  }

  /* Exam HUD on Mobile */
  .exam-hud {
    padding: 10px 12px;
    top: 6px;
    gap: 10px;
  }

  .timer-box {
    padding: 5px 12px;
    font-size: 15px;
  }

  .leaves-monitor-box {
    padding: 5px 12px;
    font-size: 12.5px;
  }

  .hide-mobile {
    display: none !important;
  }

  /* Xepto Container on Mobile */
  .xepto-container {
    height: calc(100vh - 120px);
    height: calc(100dvh - 120px);
    min-height: 480px;
    border-radius: var(--radius-sm);
  }

  .xepto-toolbar {
    padding: 8px 10px;
    gap: 6px;
  }

  .xepto-frame {
    min-height: 420px;
    -webkit-overflow-scrolling: touch;
  }

  /* Stats Grid on Mobile */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stat-card {
    padding: 12px 14px;
  }

  .stat-num {
    font-size: 22px;
  }

  .stat-label {
    font-size: 10.5px;
  }

  /* Panels & Cards */
  .panel {
    padding: 16px 12px;
    border-radius: var(--radius-md);
  }

  /* Modals on Mobile */
  .modal-overlay {
    padding: 10px;
    align-items: flex-end;
  }

  .modal-content {
    max-width: 100vw;
    width: 100%;
    max-height: 90vh;
    max-height: 90dvh;
    padding: 18px 14px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  /* Question Ribbon on Mobile */
  .q-nav-strip {
    gap: 6px;
    padding: 8px 4px;
    -webkit-overflow-scrolling: touch;
  }

  .q-ribbon-btn {
    min-width: 36px;
    height: 36px;
    font-size: 13px;
  }

  /* Invite Banner */
  .invite-box {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .invite-code-text {
    font-size: 18px;
  }

  .invite-url-text {
    font-size: 11px;
    word-break: break-all;
  }

  /* Table on Mobile */
  .table-responsive {
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-sm);
  }

  .custom-table th,
  .custom-table td {
    padding: 10px 8px;
    font-size: 12px;
    white-space: nowrap;
  }
}

@media (max-width: 420px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .brand-subtitle {
    display: none;
  }
}