/* ============================================================
   Athenaeum — LMS Core Styles
   Shared across: live-class.html, video-player.html, mock-exam.html
============================================================ */

:root {
  --clr-primary:         #005088;
  --clr-primary-light:   #e6f0f7;
  --clr-primary-dark:    #00365c;
  --clr-secondary:       #00D2FF;
  --clr-secondary-light: #e0f7fa;
  --clr-purple:          #7B2CBF;
  --clr-pink:            #FF0076;
  --clr-accent:          #FFD700;
  --clr-surface:         #f1f5f9;
  --clr-card:            #ffffff;
  --clr-border:          #e2e8f0;
  --clr-text:            #0f172a;
  --clr-muted:           #64748b;
  --clr-danger:          #ef4444;
  --clr-success:         #10b981;
  --clr-warn:            #f59e0b;
  --font-main:           'Urbanist', sans-serif;
  --font-heading:        'Merriweather', serif;
  --transition:          0.25s ease;
  --radius-xl:           16px;
  --radius-lg:           12px;
  --radius-md:           8px;
  --radius-sm:           4px;
  --shadow-sm:           0 2px 8px rgba(0,0,0,.04);
  --shadow-md:           0 4px 12px rgba(0,0,0,.05);
  --shadow-lg:           0 8px 24px rgba(0,0,0,.06);
}

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

html { font-size: 16px; }

body {
  font-family: var(--font-main);
  background: var(--clr-surface);
  color: var(--clr-muted);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 14px;
}

a { text-decoration: none; color: inherit; }
button { font-family: var(--font-main); cursor: pointer; border: none; }
input, select, textarea { font-family: var(--font-main); }

/* Shared Utilities */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.badge-live    { background: var(--clr-danger); color: #fff; animation: pulse-badge 1.4s infinite; }
.badge-success { background: var(--clr-success); color: #fff; }
.badge-warn    { background: #fef3c7; color: #92400e; }
.badge-primary { background: var(--clr-primary-light); color: var(--clr-primary); }

@keyframes pulse-badge {
  0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.4); }
  50%      { box-shadow: 0 0 0 6px rgba(239,68,68,.0); }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}
.btn .material-symbols-outlined { font-size: 18px; }
.btn-primary   { background: linear-gradient(135deg, var(--clr-primary), var(--clr-purple)); color: #fff; box-shadow: 0 4px 14px rgba(123, 44, 191, .30); border: none; }
.btn-primary:hover  { background: linear-gradient(135deg, var(--clr-primary-dark), #5c2092); box-shadow: 0 8px 24px rgba(123, 44, 191, .50); transform: translateY(-1px); }
.btn-danger    { background: var(--clr-danger); color: #fff; }
.btn-danger:hover   { background: #dc2626; }
.btn-ghost     { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.2); }
.btn-ghost:hover    { background: rgba(255,255,255,.22); }
.btn-success   { background: var(--clr-success); color: #fff; }
.btn-secondary { background: linear-gradient(135deg, var(--clr-secondary), var(--clr-primary)); color: #fff; box-shadow: 0 4px 14px rgba(0, 210, 255, .30); border: none; }
.btn-outline   { background: transparent; border: 1.5px solid var(--clr-border); color: var(--clr-text); }
.btn-outline:hover  { border-color: var(--clr-primary); color: var(--clr-primary); }
.btn-lg { padding: 12px 24px; font-size: 16px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-full { width: 100%; justify-content: center; }

/* ── TOP NAV BAR (shared) ────────────────────────────── */
.lms-nav {
  height: 64px;
  background: var(--clr-primary-dark);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  gap: 1rem;
}
.lms-nav .brand {
  display: flex; align-items: center; gap: 0.5rem;
  font-weight: 800; font-size: 1.15rem;
}
.lms-nav .nav-center { display: flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; }
.lms-nav .nav-right  { display: flex; align-items: center; gap: 0.75rem; }
.lms-nav .icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  background: rgba(255,255,255,.1); color: rgba(255,255,255,.9);
  border: none; display: grid; place-items: center; cursor: pointer;
  transition: background var(--transition);
}
.lms-nav .icon-btn:hover { background: rgba(255,255,255,.2); }
.lms-nav .icon-btn .material-symbols-outlined { font-size: 1.2rem; }

/* ============================================================
   LIVE CLASS ROOM STYLES
============================================================ */
.live-layout {
  display: block;
  width: 100%;
  height: calc(100vh - 64px);
}

/* Main video area */
.video-stage {
  position: relative;
  background: #0a0f1a;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.video-bg-grid {
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.03) 1px, transparent 0);
  background-size: 24px 24px;
}

.speaker-video {
  position: relative;
  width: 85%;
  max-width: 960px;
  aspect-ratio: 16/9;
  background: #111927;
  border-radius: var(--radius-lg);
  border: 2px solid rgba(17,202,160,.25);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.speaker-avatar-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.speaker-avatar-placeholder .avatar-ring {
  width: 76px; height: 76px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem; font-weight: 800; color: #fff;
  border: 4px solid rgba(255,255,255,.15);
  box-shadow: 0 0 40px rgba(17,202,160,.3);
}
.speaker-avatar-placeholder p { color: rgba(255,255,255,.7); font-size: 0.875rem; }
.speaker-avatar-placeholder h3 { color: white; font-size: 1.125rem; }

/* Zoom integration hint label */
.zoom-hint {
  position: absolute;
  top: 1rem; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,.65);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 99px;
  color: rgba(255,255,255,.8);
  font-size: 0.75rem;
  padding: 0.4rem 1rem;
  display: flex; align-items: center; gap: 0.4rem;
  white-space: nowrap;
}

/* Speaker name tag */
.speaker-name-tag {
  position: absolute;
  bottom: 1rem; left: 1rem;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(6px);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  display: flex; align-items: center; gap: 0.35rem;
}
.speaker-name-tag .live-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--clr-danger);
  animation: pulse-badge 1.4s infinite;
}

/* Participant thumbnails row */
.participant-row {
  display: flex;
  gap: 0.5rem;
  position: absolute;
  bottom: 1rem; right: 1rem;
  flex-wrap: wrap;
  max-width: 280px;
  justify-content: flex-end;
}
.participant-thumb {
  width: 88px;
  aspect-ratio: 16/9;
  background: #1e2d3d;
  border-radius: 6px;
  border: 1.5px solid rgba(255,255,255,.1);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 0.2rem;
  cursor: pointer;
  transition: border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.participant-thumb:hover { border-color: var(--clr-secondary); }
.participant-thumb .p-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.65rem; font-weight: 800; color: #fff;
}
.participant-thumb .p-name { font-size: 0.6rem; color: rgba(255,255,255,.7); }
.participant-thumb .p-muted {
  position: absolute; bottom: 3px; right: 4px;
  color: var(--clr-danger); font-size: 0.65rem;
}

/* Control Bar */
.control-bar {
  grid-column: 1;
  background: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0 2rem;
  border-top: 1px solid rgba(255,255,255,.06);
}

.ctrl-btn {
  display: flex; flex-direction: column;
  align-items: center; gap: 0.2rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  background: transparent;
  color: rgba(255,255,255,.8);
  border: none;
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: 600;
  transition: all var(--transition);
  min-width: 68px;
  font-family: var(--font-main);
}
.ctrl-btn .material-symbols-outlined { font-size: 1.5rem; }
.ctrl-btn:hover { background: rgba(255,255,255,.08); color: white; }
.ctrl-btn.active { color: var(--clr-secondary); }
.ctrl-btn.danger { color: var(--clr-danger); }
.ctrl-btn.danger:hover { background: rgba(239,68,68,.12); }

.ctrl-separator { width: 1px; height: 40px; background: rgba(255,255,255,.08); margin: 0 0.25rem; }

.leave-btn {
  margin-left: 1rem;
  background: var(--clr-danger);
  color: #fff;
  border-radius: var(--radius-md);
  padding: 0.7rem 1.5rem;
  font-weight: 700;
  font-size: 0.9rem;
  display: flex; align-items: center; gap: 0.4rem;
  transition: background var(--transition);
}
.leave-btn:hover { background: #dc2626; }

/* Sidebar: Chat + Participants */
.live-sidebar {
  grid-row: 1 / 3;
  background: var(--clr-card);
  border-left: 1px solid var(--clr-border);
  display: flex; flex-direction: column;
  overflow: hidden;
}

.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--clr-border);
}
.s-tab {
  flex: 1; padding: 1rem; background: none; border: none;
  font-family: var(--font-main); font-weight: 700; font-size: 0.875rem;
  color: var(--clr-muted); cursor: pointer;
  border-bottom: 2.5px solid transparent;
  transition: all var(--transition);
}
.s-tab.active { color: var(--clr-primary); border-bottom-color: var(--clr-primary); }

.tab-panel { display: none; flex-direction: column; flex: 1; overflow: hidden; }
.tab-panel.active { display: flex; }

/* Chat */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.chat-msg { display: flex; gap: 0.5rem; }
.chat-msg .cm-avatar {
  width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.65rem; font-weight: 800; color: #fff;
  flex-shrink: 0;
}
.chat-msg .cm-body { flex: 1; }
.chat-msg .cm-name { font-size: 0.7rem; font-weight: 700; color: var(--clr-primary); }
.chat-msg .cm-time { font-size: 0.65rem; color: var(--clr-muted); margin-left: 0.4rem; }
.chat-msg .cm-text { font-size: 0.825rem; color: var(--clr-text); line-height: 1.5; }

.chat-input-row {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--clr-border);
  display: flex; gap: 0.5rem;
}
.chat-input-row input {
  flex: 1; padding: 0.6rem 0.875rem;
  border: 1px solid var(--clr-border); border-radius: var(--radius-md);
  font-size: 0.875rem; outline: none;
}
.chat-input-row input:focus { border-color: var(--clr-primary); }
.chat-send-btn {
  width: 38px; height: 38px; background: var(--clr-primary);
  color: #fff; border: none; border-radius: var(--radius-md);
  display: grid; place-items: center; cursor: pointer;
}

/* Participants Tab */
.participant-list { flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: 0.5rem; }
.p-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.5rem;
  border-radius: var(--radius-md);
  transition: background var(--transition);
}
.p-item:hover { background: var(--clr-surface); }
.p-item .p-avatar-lg {
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.75rem; font-weight: 800; color: #fff;
}
.p-item .p-details { flex: 1; }
.p-item .p-details .p-nm { font-size: 0.875rem; font-weight: 700; }
.p-item .p-details .p-role { font-size: 0.7rem; color: var(--clr-muted); }
.p-item .p-icons { display: flex; gap: 0.25rem; color: var(--clr-muted); }
.p-item .p-icons .material-symbols-outlined { font-size: 1rem; }
.p-item .p-icons .muted { color: var(--clr-danger); }

/* ============================================================
   VIDEO PLAYER STYLES
============================================================ */
.player-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  min-height: calc(100vh - 64px);
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  gap: 1.5rem;
}

.player-main { display: flex; flex-direction: column; gap: 1.25rem; }

/* Video wrapper */
.video-wrapper {
  position: relative;
  width: 100%;
  background: #0a0f1a;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 16/9;
}

.video-el {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: #0d1b2a;
}

/* Dynamic Watermark */
.watermark-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  overflow: hidden;
}
.watermark-text {
  position: absolute;
  color: rgba(255,255,255,0.18);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
  user-select: none;
  font-family: monospace;
  animation: wm-float 28s linear infinite;
}
/* 3 watermarks at different starting positions */
.watermark-text:nth-child(1) { animation-delay: 0s;    top: 20%; }
.watermark-text:nth-child(2) { animation-delay: -9s;   top: 55%; }
.watermark-text:nth-child(3) { animation-delay: -18s;  top: 80%; }

@keyframes wm-float {
  0%   { left: -30%; opacity: 0; }
  5%   { opacity: 1; }
  90%  { opacity: 1; }
  100% { left: 110%; opacity: 0; }
}

/* Video controls overlay */
.video-controls {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,.85));
  padding: 2.5rem 1.25rem 1rem;
  z-index: 10;
  transition: opacity var(--transition);
}
.video-wrapper:not(:hover) .video-controls { opacity: 0; }
.video-wrapper:hover .video-controls { opacity: 1; }

/* Seek bar */
.seek-bar-wrap {
  width: 100%;
  position: relative;
  cursor: pointer;
  margin-bottom: 0.75rem;
}
.seek-track {
  width: 100%; height: 4px;
  background: rgba(255,255,255,.3);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}
.seek-buffered {
  height: 100%;
  background: rgba(255,255,255,.5);
  width: 65%;
  border-radius: 2px;
}
.seek-progress {
  position: absolute; top: 0; left: 0;
  height: 100%;
  background: var(--clr-secondary);
  width: 32%;
  border-radius: 2px;
  transition: width 0.1s linear;
}
.seek-thumb {
  position: absolute;
  top: 50%;
  left: 32%;
  transform: translate(-50%, -50%);
  width: 14px; height: 14px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(0,0,0,.4);
  transition: transform var(--transition);
}
.seek-bar-wrap:hover .seek-thumb { transform: translate(-50%, -50%) scale(1.3); }
.seek-bar-wrap:hover .seek-track { height: 6px; }

.controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.controls-left, .controls-right {
  display: flex; align-items: center; gap: 0.25rem;
}

.v-btn {
  width: 36px; height: 36px; background: none; border: none;
  color: rgba(255,255,255,.9); cursor: pointer; display: grid; place-items: center;
  border-radius: 50%; transition: background var(--transition);
}
.v-btn:hover { background: rgba(255,255,255,.12); }
.v-btn .material-symbols-outlined { font-size: 1.25rem; }

.time-display { color: rgba(255,255,255,.85); font-size: 0.8rem; font-family: monospace; margin: 0 0.5rem; }

.speed-select {
  background: rgba(255,255,255,.12); color: rgba(255,255,255,.9);
  border: 1px solid rgba(255,255,255,.2); border-radius: 4px;
  padding: 0.25rem 0.4rem; font-size: 0.75rem; cursor: pointer;
}

/* Video placeholder graphic */
.video-placeholder-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, #0d1b2a 0%, #162131 60%, #0a1520 100%);
  display: flex; align-items: center; justify-content: center;
}
.play-overlay {
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
}
.play-circle {
  width: 64px; height: 64px;
  background: rgba(255,255,255,.1);
  border: 2px solid rgba(255,255,255,.3);
  border-radius: 50%;
  display: grid; place-items: center;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}
.play-circle:hover { background: rgba(17,202,160,.25); border-color: var(--clr-secondary); transform: scale(1.1); }
.play-circle .material-symbols-outlined { font-size: 2.5rem; color: white; }

/* Player Info */
.player-info-bar {
  background: var(--clr-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--clr-border);
}
.player-info-bar h2 { font-size: 1.25rem; color: var(--clr-primary); margin-bottom: 0.4rem; }
.player-info-meta { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.player-info-meta span { display: flex; align-items: center; gap: 0.3rem; font-size: 0.8rem; color: var(--clr-muted); }
.player-info-meta .material-symbols-outlined { font-size: 1rem; color: var(--clr-secondary); }

/* Lesson List Sidebar */
.lesson-sidebar {
  background: var(--clr-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  display: flex; flex-direction: column;
  overflow: hidden;
  max-height: calc(100vh - 64px - 3rem);
  position: sticky; top: 1.5rem;
}
.lesson-sidebar-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--clr-border);
}
.lesson-sidebar-header h3 { font-size: 1rem; color: var(--clr-primary); }
.lesson-sidebar-header p { font-size: 0.75rem; color: var(--clr-muted); margin-top: 0.2rem; }
.lesson-list { flex: 1; overflow-y: auto; padding: 0.5rem; }

.lesson-item {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
  border-bottom: 1px solid var(--clr-border);
}
.lesson-item:hover { background: var(--clr-surface); }
.lesson-item.active { background: var(--clr-primary-light); }
.lesson-item .l-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--clr-surface); color: var(--clr-muted);
  display: grid; place-items: center; font-size: 0.75rem; font-weight: 700;
  flex-shrink: 0;
}
.lesson-item.active .l-num { background: var(--clr-primary); color: #fff; }
.lesson-item.done .l-num { background: var(--clr-secondary-light); color: var(--clr-secondary); }
.lesson-item .l-info { flex: 1; min-width: 0; }
.lesson-item .l-title { font-size: 0.875rem; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lesson-item .l-duration { font-size: 0.7rem; color: var(--clr-muted); display: flex; align-items: center; gap: 0.2rem; margin-top: 0.15rem; }
.lesson-item .l-duration .material-symbols-outlined { font-size: 0.8rem; }

/* Watermark badge */
.wm-badge {
  position: absolute;
  top: 1rem; right: 1rem;
  background: rgba(0,0,0,.6);
  border: 1px solid rgba(17,202,160,.3);
  border-radius: 4px;
  color: rgba(255,255,255,.7);
  font-size: 0.7rem;
  padding: 0.3rem 0.6rem;
  display: flex; align-items: center; gap: 0.3rem;
  z-index: 6;
}
.wm-badge .material-symbols-outlined { font-size: 0.8rem; color: var(--clr-secondary); }

/* ============================================================
   MOCK EXAM ENGINE STYLES
============================================================ */
.exam-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
  min-height: calc(100vh - 64px);
}

/* Exam Header */
.exam-header {
  grid-column: 1 / -1;
  background: var(--clr-card);
  border-radius: var(--radius-xl);
  padding: 1.5rem 2rem;
  border: 1px solid var(--clr-border);
  display: flex; align-items: center; gap: 2rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}
.exam-title-block { flex: 1; }
.exam-title-block h1 { font-size: 1.25rem; color: var(--clr-primary); margin-bottom: 0.25rem; }
.exam-title-block p { font-size: 0.85rem; color: var(--clr-muted); }

/* Countdown Timer */
.countdown-block {
  text-align: center;
  background: var(--clr-primary);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 0.875rem 1.5rem;
  min-width: 160px;
}
.countdown-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.8; margin-bottom: 0.2rem; }
.countdown-display {
  font-family: 'Courier New', monospace;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1;
}
.countdown-block.warning { background: var(--clr-warn); }
.countdown-block.danger  { background: var(--clr-danger); animation: shake 0.5s ease-in-out infinite alternate; }

@keyframes shake {
  0%   { transform: rotate(-0.5deg); }
  100% { transform: rotate(0.5deg); }
}

/* Exam main + sidebar */
.exam-main { display: flex; flex-direction: column; gap: 1.5rem; }
.exam-side  { display: flex; flex-direction: column; gap: 1.5rem; }

/* Question Card */
.question-card {
  background: var(--clr-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}
.q-progress-bar {
  height: 4px; background: var(--clr-border); border-radius: 2px;
  margin-bottom: 1.5rem; overflow: hidden;
}
.q-progress-fill {
  height: 100%; background: var(--clr-secondary);
  border-radius: 2px;
  transition: width 0.4s ease;
}
.q-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
.q-number { font-size: 0.8rem; font-weight: 700; color: var(--clr-muted); }
.q-marks { font-size: 0.8rem; color: var(--clr-secondary); font-weight: 700; }

.q-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--clr-text);
  margin-bottom: 1.75rem;
  font-weight: 500;
}

/* MCQ Options */
.mcq-options { display: flex; flex-direction: column; gap: 0.75rem; }
.mcq-option {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--clr-card);
  position: relative;
}
.mcq-option:hover { border-color: var(--clr-primary); background: var(--clr-primary-light); }
.mcq-option.selected { border-color: var(--clr-primary); background: var(--clr-primary-light); }
.mcq-option.correct  { border-color: var(--clr-success); background: #f0fdf4; }
.mcq-option.wrong    { border-color: var(--clr-danger);  background: #fef2f2; }

.option-letter {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  display: grid; place-items: center;
  font-size: 0.8rem; font-weight: 800;
  color: var(--clr-muted);
  flex-shrink: 0;
  transition: all var(--transition);
}
.mcq-option.selected .option-letter { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); }
.mcq-option.correct  .option-letter { background: var(--clr-success); color: #fff; border-color: var(--clr-success); }
.mcq-option.wrong    .option-letter { background: var(--clr-danger);  color: #fff; border-color: var(--clr-danger); }

.option-text { font-size: 0.9rem; line-height: 1.5; padding-top: 0.2rem; }

.q-nav-row {
  display: flex; justify-content: space-between; align-items: center; margin-top: 2rem;
}

/* Question Navigator (Right sidebar) */
.question-nav-card {
  background: var(--clr-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}
.question-nav-card h3 { font-size: 0.9rem; color: var(--clr-primary); margin-bottom: 1rem; }
.q-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.q-dot {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  display: grid; place-items: center;
  font-size: 0.75rem; font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--clr-muted);
}
.q-dot:hover        { border-color: var(--clr-primary); color: var(--clr-primary); }
.q-dot.answered     { background: var(--clr-primary-light); border-color: var(--clr-primary); color: var(--clr-primary); }
.q-dot.current      { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); }
.q-dot.review       { background: #fef3c7; border-color: var(--clr-warn); color: #92400e; }

.q-legend { display: flex; flex-direction: column; gap: 0.5rem; }
.legend-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.75rem; color: var(--clr-muted); }
.legend-swatch { width: 14px; height: 14px; border-radius: 3px; flex-shrink: 0; }

/* Exam Info card */
.exam-info-card {
  background: var(--clr-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}
.exam-info-card h3 { font-size: 0.9rem; color: var(--clr-primary); margin-bottom: 1rem; }
.exam-info-list { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.exam-info-list li { display: flex; align-items: center; gap: 0.5rem; font-size: 0.825rem; color: var(--clr-muted); }
.exam-info-list .material-symbols-outlined { font-size: 1rem; color: var(--clr-secondary); }

/* ── Result Summary Screen ─────────────────────────────── */
#result-screen {
  display: none;
  position: fixed; inset: 0; z-index: 200;
  background: var(--clr-surface);
  overflow-y: auto;
}
#result-screen.visible { display: block; }

.result-wrapper {
  max-width: 820px;
  margin: 3rem auto;
  padding: 0 1.5rem;
  animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-hero {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dark));
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  text-align: center;
  color: #fff;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}
.result-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 0);
  background-size: 24px 24px;
}
.result-icon { font-size: 4rem; margin-bottom: 0.75rem; }
.result-hero h1 { font-size: 2rem; margin-bottom: 0.5rem; position: relative; }
.result-hero p  { font-size: 1rem; opacity: 0.85; position: relative; }

.score-ring-wrap {
  display: flex; justify-content: center; margin: 1.5rem 0;
}
.score-ring {
  width: 150px; height: 150px; position: relative;
}
.score-ring svg { transform: rotate(-90deg); }
.score-ring .ring-bg  { fill: none; stroke: rgba(255,255,255,.15); stroke-width: 8; }
.score-ring .ring-val {
  fill: none; stroke: var(--clr-accent); stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: var(--score-dash, 0) 314;
  transition: stroke-dasharray 1.5s ease;
}
.score-center {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.score-pct { font-size: 2rem; font-weight: 900; color: #fff; line-height: 1; }
.score-label { font-size: 0.7rem; opacity: 0.7; letter-spacing: 0.08em; text-transform: uppercase; }

.result-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem; margin-bottom: 2rem;
}
.result-stat-card {
  background: var(--clr-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.result-stat-card .r-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.result-stat-card .r-val  { font-size: 1.5rem; font-weight: 900; color: var(--clr-primary); line-height: 1; }
.result-stat-card .r-lbl  { font-size: 0.75rem; color: var(--clr-muted); margin-top: 0.25rem; }

/* Question review */
.review-section h2 {
  font-size: 1.125rem;
  color: var(--clr-primary);
  margin-bottom: 1rem;
}
.review-item {
  background: var(--clr-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}
.review-item-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.review-q-num { font-size: 0.75rem; color: var(--clr-muted); font-weight: 700; }
.review-q-text { font-size: 0.9rem; font-weight: 600; flex: 1; }
.review-q-icon .material-symbols-outlined { font-size: 1.25rem; }
.review-q-icon.correct .material-symbols-outlined { color: var(--clr-success); }
.review-q-icon.wrong   .material-symbols-outlined { color: var(--clr-danger); }
.review-answers { display: flex; flex-direction: column; gap: 0.4rem; margin-top: 0.75rem; }
.review-ans {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  border: 1px solid var(--clr-border);
}
.review-ans.correct { background: #f0fdf4; border-color: var(--clr-success); color: #166534; }
.review-ans.wrong   { background: #fef2f2; border-color: var(--clr-danger); color: #991b1b; }

.result-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 2rem; padding-bottom: 3rem; }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 1024px) {
  .live-layout   { display: block; }
  .live-sidebar  { grid-row: auto; max-height: 320px; }
  .control-bar   { grid-column: 1; }
  .player-layout { grid-template-columns: 1fr; }
  .lesson-sidebar { position: static; max-height: 400px; }
  .exam-layout   { grid-template-columns: 1fr; }
  .result-stats-row { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .lms-nav .nav-center { display: none; }
  .exam-header  { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .exam-layout  { padding: 1rem; gap: 1rem; }
  .question-card { padding: 1.25rem; }
  .result-stats-row { grid-template-columns: 1fr; }
}