:root {
  color-scheme: dark;
  --bg-primary: #06101b;
  --bg-secondary: #0b1829;
  --surface-primary: rgba(9, 19, 34, 0.84);
  --surface-secondary: rgba(16, 32, 53, 0.62);
  --glass-bg: rgba(9, 19, 34, 0.72);
  --card-bg: rgba(10, 21, 37, 0.9);
  --card-border: rgba(255, 255, 255, 0.12);
  --text-primary: #f8fbff;
  --text-secondary: #d7e2f3;
  --text-muted: #9fb0ca;
  --input-bg: rgba(12, 25, 43, 0.86);
  --input-border: rgba(177, 210, 255, 0.18);
  --input-focus: #61d6ff;
  --button-primary: linear-gradient(135deg, #38bdf8, #2563eb 55%, #7c3aed);
  --button-primary-hover: linear-gradient(135deg, #67e8f9, #3b82f6 52%, #8b5cf6);
  --accent-primary: #61d6ff;
  --accent-secondary: #ffbe5c;
  --shadow-soft: 0 12px 34px rgba(0, 0, 0, 0.22);
  --shadow-medium: 0 26px 70px rgba(0, 0, 0, 0.34);
  --shadow-strong: 0 42px 110px rgba(0, 0, 0, 0.46);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  /* Backgrounds */
  --bg: var(--bg-primary);
  --bg-secondary: #0b1829;
  --bg-tertiary: #0f1e30;
  --bg-elevated: #142236;
  
  /* Cards & Panels */
  --panel: var(--glass-bg);
  --panel-strong: rgba(10, 21, 37, 0.92);
  --panel-soft: rgba(16, 32, 53, 0.54);
  --panel-hover: rgba(20, 36, 58, 0.82);
  
  /* Text */
  --text: var(--text-primary);
  --text-secondary: #d7e2f3;
  --muted: var(--text-muted);
  --text-inverse: #06101b;
  
  /* Borders */
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.18);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(97, 214, 255, 0.55);
  
  /* Shadows */
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.32);
  --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 40px 100px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(31, 178, 255, 0.15);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--accent), #9df0ff);
  --gradient-warm: linear-gradient(135deg, var(--warm), #ffe59a);
  --gradient-success: linear-gradient(135deg, var(--success), #7fffd4);
  --gradient-danger: linear-gradient(135deg, var(--danger), #ffb8c0);
  --gradient-surface: linear-gradient(145deg, #06101b 0%, #081624 45%, #0c1f35 100%);
  
  /* Colors */
  --accent: hsl(196, 100%, 73%);
  --accent-strong: #1fb2ff;
  --accent-hover: #4dc8ff;
  --accent-soft: rgba(31, 178, 255, 0.12);
  
  --warm: #ffbe5c;
  --warm-hover: #ffcc7a;
  --warm-soft: rgba(255, 190, 92, 0.14);
  
  --success: #3dd9a4;
  --success-hover: #5ce8b8;
  --success-soft: rgba(61, 217, 164, 0.14);
  --success-bg: rgba(61, 217, 164, 0.08);
  
  --danger: #ff7c82;
  --danger-hover: #ff9aa0;
  --danger-soft: rgba(255, 124, 130, 0.14);
  --danger-bg: rgba(255, 124, 130, 0.08);
  
  --warning: #ffd166;
  --warning-hover: #ffe085;
  --warning-soft: rgba(255, 209, 102, 0.14);
  --warning-bg: rgba(255, 209, 102, 0.08);
  
  /* Semantic Colors */
  --primary: var(--accent);
  --secondary: var(--warm);
  --info: var(--accent-strong);
  
  /* Hover States */
  --hover-bg: rgba(255, 255, 255, 0.08);
  --hover-bg-strong: rgba(255, 255, 255, 0.12);
  --hover-border: rgba(97, 214, 255, 0.36);
  
  /* Spacing */
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  
  /* Transitions */
  --transition-fast: 120ms ease;
  --transition: 180ms ease;
  --transition-slow: 280ms ease;
  --transition-bounce: 420ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Z-Index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 178, 255, 0.18), transparent 26%),
    radial-gradient(circle at 80% 20%, rgba(255, 190, 92, 0.18), transparent 24%),
    linear-gradient(145deg, #06101b 0%, #081624 45%, #0c1f35 100%);
  position: relative;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

[hidden],
.is-hidden {
  display: none !important;
}

.shell-width {
  width: min(1160px, calc(100% - 2rem));
  margin: 0 auto;
}

.page-stack {
  display: grid;
  gap: 1.5rem;
  padding-bottom: 3rem;
}

.section-stack {
  display: grid;
  gap: 1.25rem;
}

.glass-card {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.background-orb {
  position: fixed;
  width: 26rem;
  height: 26rem;
  border-radius: 50%;
  filter: blur(50px);
  pointer-events: none;
  opacity: 0.36;
  z-index: -1;
}

.orb-one {
  top: -6rem;
  left: -5rem;
  background: rgba(31, 178, 255, 0.34);
}

.orb-two {
  top: 24%;
  right: -8rem;
  background: rgba(255, 190, 92, 0.24);
}

.orb-three {
  bottom: -8rem;
  left: 28%;
  background: rgba(80, 100, 255, 0.18);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.35rem 0;
}

.topbar-cluster,
.nav-actions,
.hero-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.25rem;
}

.brand-dot {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--warm));
  box-shadow: 0 0 0 0.35rem rgba(97, 214, 255, 0.14);
}

.btn {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.85rem 1.2rem;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition),
    opacity var(--transition),
    box-shadow var(--transition);
  font-weight: 700;
  letter-spacing: -0.02em;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
}

.btn:hover::before {
  opacity: 1;
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

.btn-primary {
  color: #08111d;
  background: var(--gradient-primary);
  box-shadow: 0 14px 36px rgba(31, 178, 255, 0.22);
}

.btn-primary:hover {
  box-shadow: 0 18px 44px rgba(31, 178, 255, 0.32), var(--shadow-glow);
}

.btn-secondary {
  color: var(--text);
  background: var(--hover-bg);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background: var(--hover-bg-strong);
  border-color: var(--hover-border);
  box-shadow: var(--shadow-sm);
}

.btn-ghost {
  color: var(--muted);
  background: transparent;
  border-color: var(--border-subtle);
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--hover-bg);
  border-color: var(--border);
}

/* Theme Toggle */
.theme-toggle {
  padding: 0.75rem;
  min-width: 2.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
}

.theme-icon {
  font-size: 1.25rem;
  display: block;
  transition: transform var(--transition-bounce), opacity var(--transition);
}

.theme-toggle:hover .theme-icon {
  transform: rotate(15deg) scale(1.15);
}

.theme-toggle:active .theme-icon {
  transform: rotate(-15deg) scale(0.95);
}

[data-theme="light"] .theme-icon {
  animation: icon-swap 0.4s ease forwards;
}

@keyframes icon-swap {
  0% {
    opacity: 0;
    transform: rotate(-90deg) scale(0.8);
  }
  100% {
    opacity: 1;
    transform: rotate(0deg) scale(1);
  }
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-large {
  padding-inline: 1.5rem;
}

.landing-page main {
  padding-bottom: 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 1.5rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
}

.hero-copy,
.hero-preview,
.auth-card,
.auth-aside,
.hero-banner,
.quiz-stage,
.result-hero {
  padding: 2rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.eyebrow::before {
  content: "";
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.65;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 4rem);
  line-height: 1.02;
}

h2 {
  font-size: clamp(1.45rem, 2.5vw, 2.15rem);
}

h3 {
  font-size: 1.1rem;
}

.lead,
.muted-copy,
.helper-text,
.feedback-copy,
.sync-status,
.auth-meta {
  color: var(--muted);
}

.lead {
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 58ch;
}

.metric-strip {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.metric-strip article,
.result-mini-grid article {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

.metric-strip strong,
.result-mini-grid strong {
  display: block;
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.preview-stack {
  display: grid;
  gap: 1rem;
}

.preview-panel {
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--panel-soft);
}

.accent-panel {
  background:
    linear-gradient(135deg, rgba(31, 178, 255, 0.12), rgba(255, 190, 92, 0.12)),
    var(--panel-soft);
}

.preview-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--warm);
  font-weight: 800;
}

.mini-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.7rem;
}

.mini-list li {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
}

.mini-list span,
.leaderboard-rank {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--panel);
  font-weight: 800;
}

.feature-section {
  padding-bottom: 2rem;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

.compact-heading {
  margin-bottom: 1rem;
}

.feature-grid,
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.feature-card,
.stat-card,
.quiz-card,
.answer-card,
.management-card {
  padding: 1.35rem;
}

.feature-card p,
.quiz-card p,
.management-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.6;
}

.auth-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(280px, 0.7fr);
  gap: 1.5rem;
  align-items: stretch;
  min-height: calc(100vh - 8rem);
  padding-bottom: 2.5rem;
}

.auth-card {
  align-self: center;
}

.auth-aside {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.2rem;
}

.stack-form {
  display: grid;
  gap: 1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.compact-grid {
  gap: 0.85rem;
}

.input-group {
  display: grid;
  gap: 0.5rem;
}

.input-group span {
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  color: var(--text);
  padding: 0.95rem 1rem;
  outline: none;
  transition:
    border-color var(--transition),
    background var(--transition),
    box-shadow var(--transition);
}

input::placeholder,
textarea::placeholder {
  color: var(--muted);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 0.25rem var(--accent-soft);
  background: var(--panel);
}

input:hover,
select:hover,
textarea:hover {
  border-color: var(--border-strong);
}

textarea {
  resize: vertical;
  min-height: 6rem;
}

.helper-text,
.auth-meta {
  font-size: 0.94rem;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.feature-list li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--muted);
  line-height: 1.6;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--warm));
}

.inline-note {
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel-soft);
  color: var(--muted);
}

.warning-note {
  border-color: var(--warning);
  background: var(--warning-bg);
  color: var(--warning);
}

.hero-banner {
  display: flex;
  justify-content: space-between;
  gap: 1.25rem;
  align-items: center;
}

.hero-side-meta {
  display: grid;
  justify-items: end;
  gap: 0.85rem;
  text-align: right;
}

.user-chip,
.role-pill,
.quiz-badge,
.status-badge,
.timer-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.6rem;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.user-chip {
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

.role-pill {
  text-transform: capitalize;
  color: #05111c;
  background: linear-gradient(135deg, var(--warm), #ffe59a);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.stat-card {
  display: grid;
  gap: 0.45rem;
}

.stat-card strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2rem;
}

.stat-label {
  font-size: 0.92rem;
  color: var(--muted);
}

.chip-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.quiz-badge,
.chip {
  border: 1px solid var(--accent-soft);
  background: var(--accent-soft);
  color: var(--accent);
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font-weight: 700;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr);
  gap: 1.5rem;
}

.quiz-card {
  display: grid;
  gap: 1rem;
}

.quiz-card-header,
.management-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.quiz-card-footer,
.management-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.quiz-meta-row,
.meta-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.meta-pill,
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.status-published {
  color: var(--success);
  background: var(--success-bg);
  border-color: var(--success);
}

.status-draft {
  color: var(--warning);
  background: var(--warning-bg);
  border-color: var(--warning);
}

.status-archived {
  color: var(--danger);
  background: var(--danger-bg);
  border-color: var(--danger);
}

.status-private,
.status-waiting {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: var(--accent);
}

.status-live {
  color: var(--success);
  background: var(--success-bg);
  border-color: var(--success);
}

.status-ended {
  color: var(--danger);
  background: var(--danger-bg);
  border-color: var(--danger);
}

.leaderboard-shell {
  padding: 0.8rem;
}

.leaderboard-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.85rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  border: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.leaderboard-item:hover {
  background: var(--panel);
  border-color: var(--border-strong);
  transform: translateX(2px);
}

.leaderboard-item.lb-top {
  background: linear-gradient(135deg, var(--warm-soft), var(--accent-soft));
  border-color: var(--warm);
  animation: podium-glow 2s ease-in-out infinite;
}

.leaderboard-item.lb-top .leaderboard-rank {
  background: var(--warm);
  color: var(--text-inverse);
  box-shadow: 0 0 20px rgba(255, 190, 92, 0.4);
}

.leaderboard-item.lb-top .leaderboard-name {
  color: var(--warm);
  font-weight: 800;
}

.leaderboard-item.lb-top .lb-score {
  color: var(--warm);
  font-size: 1.5rem;
}

@keyframes podium-glow {
  0%,
  100% {
    box-shadow: 0 0 10px rgba(255, 190, 92, 0.2);
  }

  50% {
    box-shadow: 0 0 25px rgba(255, 190, 92, 0.4);
  }
}

.leaderboard-item.rank-up {
  animation: rank-rise 400ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.leaderboard-item.rank-down {
  animation: rank-fall 400ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes rank-rise {
  from {
    transform: translateY(10px);
    opacity: 0.6;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes rank-fall {
  from {
    transform: translateY(-10px);
    opacity: 0.6;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.lb-score {
  transition: color var(--transition), font-size var(--transition);
}

.lb-score.score-increase {
  animation: score-pop 500ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  color: var(--success);
}

@keyframes score-pop {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.2);
  }

  100% {
    transform: scale(1);
  }
}

.leaderboard-name {
  font-weight: 800;
}

.leaderboard-meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.leaderboard-score {
  text-align: right;
}

.leaderboard-score strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
}

.empty-state {
  padding: 2rem;
  text-align: center;
  color: var(--muted);
}

.quiz-stage {
  display: grid;
  gap: 1.5rem;
}

.quiz-stage-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.timer-pill {
  min-width: 5rem;
  background: var(--warm-soft);
  border: 1px solid var(--warm);
  color: var(--warm);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.2rem;
}

.quiz-progress-row {
  display: grid;
  gap: 0.75rem;
}

.progress-track {
  width: 100%;
  height: 0.75rem;
  border-radius: 999px;
  background: var(--panel-soft);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(135deg, var(--accent), var(--warm));
  border-radius: inherit;
  transition: width 200ms linear;
}

.question-panel {
  display: grid;
  gap: 1.25rem;
  padding: 1.6rem;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--border);
}

.question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.question-count {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.option-grid {
  display: grid;
  gap: 0.9rem;
}

.option-button {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: center;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel-soft);
  color: var(--text);
  text-align: left;
  transition:
    background var(--transition),
    border-color var(--transition),
    transform var(--transition);
}

.option-button.option-animate {
  grid-template-columns: auto 1fr auto;
}

.option-label {
  min-width: 0;
}

.option-button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--hover-border);
  background: var(--panel);
}

.option-button:disabled {
  cursor: default;
}

.option-key {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--panel);
  border: 1px solid var(--border);
  font-weight: 800;
}

.option-button.correct {
  background: var(--success-bg);
  border-color: var(--success);
}

.option-button.incorrect {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.feedback-copy {
  min-height: 1.5rem;
  margin: 0;
}

.feedback-copy.success {
  color: var(--success);
}

.feedback-copy.error {
  color: var(--danger);
}

.feedback-copy.warning {
  color: var(--warning);
}

.result-hero {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: start;
}

.result-percentage {
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 800;
  margin: 0.45rem 0 0;
}

.result-side {
  display: grid;
  gap: 1rem;
  justify-items: end;
}

.result-mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.result-breakdown {
  display: grid;
  gap: 1rem;
}

.answer-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--panel);
  transition: border-color var(--transition);
}

.answer-card.correct {
  border-color: var(--success);
  background: var(--success-bg);
}

.answer-card.incorrect {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.answer-card.unanswered {
  border-color: var(--warning);
  background: var(--warning-bg);
}

.answer-card-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.answer-status {
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.answer-card.correct .answer-status {
  color: var(--success);
}

.answer-card.incorrect .answer-status {
  color: var(--danger);
}

.answer-card.unanswered .answer-status {
  color: var(--warning);
}

.answer-meta {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.studio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  gap: 1.5rem;
}

.builder-stack,
.management-stack {
  display: grid;
  gap: 1rem;
}

.question-builder-item {
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color var(--transition), background var(--transition);
}

.question-builder-item:hover {
  border-color: var(--border-strong);
  background: var(--panel-hover);
}

.builder-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.builder-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.form-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.management-card {
  display: grid;
  gap: 1rem;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color var(--transition), background var(--transition);
}

.management-card:hover {
  border-color: var(--border-strong);
  background: var(--panel-hover);
}

.session-list,
.participant-list {
  display: grid;
  gap: 0.85rem;
}

.session-row,
.participant-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  border: 1px solid var(--border);
  transition: border-color var(--transition), background var(--transition);
}

.session-row:hover,
.participant-row:hover {
  border-color: var(--border-strong);
  background: var(--panel);
}

.participant-header-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.session-row div:first-child,
.participant-row {
  min-width: 0;
}

.session-row strong,
.session-row span,
.participant-row span {
  display: block;
}

.session-row span,
.participant-row strong {
  color: var(--muted);
  font-size: 0.94rem;
}

.participant-score-stack {
  display: grid;
  justify-items: end;
  gap: 0.45rem;
}

.live-hero {
  align-items: stretch;
}

.session-code-card {
  min-width: min(260px, 100%);
  display: grid;
  place-items: center;
  align-content: center;
  gap: 0.45rem;
  padding: 1.1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  text-align: center;
}

.session-code-card span,
.session-code-card small {
  color: var(--muted);
  font-weight: 700;
}

.session-code-card strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 0.16em;
}

.live-control-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 1rem 1.2rem;
}

.live-control-bar > div:first-child {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.live-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.75fr);
  gap: 1.5rem;
}

.live-pulse-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
}

.live-pulse-card {
  position: relative;
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem;
  overflow: hidden;
}

.live-pulse-card::after {
  content: "";
  position: absolute;
  inset: auto 1rem 1rem auto;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0.45rem var(--accent-soft);
  animation: live-dot-pulse 1.8s ease-in-out infinite;
}

.live-pulse-card--active::after {
  background: var(--success);
  box-shadow: 0 0 0 0.45rem var(--success-soft);
}

.live-pulse-card--muted::after {
  background: var(--danger);
  box-shadow: 0 0 0 0.45rem var(--danger-soft);
}

.live-pulse-card span {
  color: var(--muted);
  font-weight: 800;
}

.live-pulse-card strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  transition: color var(--transition), transform var(--transition);
}

.live-chip {
  min-height: auto;
  padding: 0.22rem 0.5rem;
  font-size: 0.74rem;
}

@keyframes live-dot-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.72;
  }

  50% {
    transform: scale(1.28);
    opacity: 1;
  }
}

.timer-dashboard {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--warm-soft);
  border: 1px solid var(--warm);
}

.timer-dashboard strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--warm);
}

.distribution-list,
.analytics-panel,
.mini-analytics-list {
  display: grid;
  gap: 0.85rem;
}

.distribution-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(160px, 1.2fr) 3.5rem;
  align-items: center;
  gap: 0.8rem;
  padding: 0.9rem;
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  border: 1px solid var(--border);
  transition: background var(--transition);
}

.distribution-label {
  min-width: 0;
}

.distribution-label strong {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-right: 0.5rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
}

.distribution-label span {
  color: var(--muted);
}

.distribution-track {
  height: 0.8rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--panel-soft);
}

.distribution-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent), var(--warm));
  transition: width 220ms ease;
}

.answer-status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.answer-status-card {
  display: grid;
  gap: 0.55rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color var(--transition);
}

.answer-status-card strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2rem;
}

.answer-status-card.correct strong {
  color: var(--success);
}

.answer-status-card.incorrect strong {
  color: var(--danger);
}

.answer-status-card.unanswered strong {
  color: var(--warning);
}

.answer-status-card div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.answer-status-card div span,
.answer-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.teacher-option {
  cursor: default;
}

.option-button.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.student-live-board {
  display: grid;
  gap: 0.7rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--border);
}

.student-live-board:not(.is-hidden) {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: grid;
  place-items: center;
  padding: 1rem;
  border: 0;
  border-radius: 0;
  background: color-mix(in srgb, var(--bg) 76%, transparent);
  backdrop-filter: blur(18px);
  animation: leaderboard-backdrop-in 220ms ease both;
}

.student-live-board:not(.is-hidden) .eyebrow {
  display: none;
}

.student-live-board:not(.is-hidden) #student-live-leaderboard {
  width: min(620px, 100%);
  max-height: min(78vh, 720px);
  overflow: auto;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
  box-shadow: var(--shadow-lg);
  animation: leaderboard-modal-in 360ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.leaderboard-modal-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1rem;
}

.leaderboard-modal-heading strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.55rem, 4vw, 2.2rem);
}

.leaderboard-modal-heading span {
  color: var(--muted);
  font-weight: 800;
}

.live-feedback-card {
  display: none;
}

.live-feedback-card.success,
.live-feedback-card.error,
.live-feedback-card.warning {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
  width: min(360px, 100%);
  margin: 0.25rem auto 0.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-lg);
  border: 1px solid currentColor;
  text-align: center;
  background: var(--panel-strong);
  box-shadow: var(--shadow-sm);
  animation: feedback-card-in 420ms cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.live-feedback-card.success {
  background: var(--success-bg);
}

.live-feedback-card.error {
  background: var(--danger-bg);
}

.live-feedback-card.warning {
  background: var(--warning-bg);
}

.live-feedback-card strong {
  color: var(--text);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.15rem;
}

.live-feedback-card small {
  color: var(--muted);
  font-weight: 700;
}

.feedback-icon {
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  color: var(--text-inverse);
  background: var(--accent);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 24%, transparent);
  font-weight: 900;
}

.live-feedback-card.success .feedback-icon {
  background: var(--success);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--success) 24%, transparent);
}

.live-feedback-card.error .feedback-icon {
  background: var(--danger);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--danger) 24%, transparent);
}

.live-feedback-card.warning .feedback-icon {
  background: var(--warning);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--warning) 24%, transparent);
}

@keyframes feedback-card-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.94);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes leaderboard-backdrop-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes leaderboard-modal-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.live-join-layout {
  display: grid;
  place-items: center;
  min-height: calc(100vh - 8rem);
  padding-bottom: 2.5rem;
}

.join-card {
  width: min(760px, 100%);
  animation: panel-rise 220ms ease both;
}

.compact-result-hero {
  padding: 0;
  box-shadow: none;
  border: 0;
  background: transparent;
  backdrop-filter: none;
}

.live-result-grid {
  margin: 1.2rem 0 1.5rem;
}

.join-status-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}

.join-status-grid article {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color var(--transition);
}

.join-status-grid span {
  display: block;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.join-status-grid strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.35rem;
}

.analytics-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
}

.analytics-summary-grid article,
.mini-analytics-list article {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color var(--transition), background var(--transition);
}

.analytics-summary-grid article:hover,
.mini-analytics-list article:hover {
  border-color: var(--border-strong);
  background: var(--panel-hover);
}

.analytics-summary-grid span,
.mini-analytics-list span {
  display: block;
  color: var(--muted);
  margin-top: 0.25rem;
}

.analytics-summary-grid strong {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.6rem;
}

.analytics-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.answer-chip {
  margin: 0.15rem;
}

.answer-chip.correct {
  color: var(--success);
  background: var(--success-bg);
}

.answer-chip.incorrect {
  color: var(--danger);
  background: var(--danger-bg);
}

.answer-chip.unanswered {
  color: var(--warning);
  background: var(--warning-bg);
}

.table-shell {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.data-table th,
.data-table td {
  padding: 1rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  color: var(--muted);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.data-table td {
  color: var(--text);
}

.role-badge {
  display: inline-flex;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  text-transform: capitalize;
  font-weight: 800;
  background: var(--panel-soft);
  color: var(--text);
}

.role-student {
  background: var(--accent-soft);
  color: var(--accent);
}

.role-teacher {
  background: var(--warning-bg);
  color: var(--warning);
}

.role-admin {
  background: var(--danger-bg);
  color: var(--danger);
}

.toast-root {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  display: grid;
  gap: 0.75rem;
  z-index: 30;
}

.toast {
  min-width: min(360px, calc(100vw - 2rem));
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
  box-shadow: var(--shadow);
  animation: toast-enter 180ms ease forwards;
}

.toast-info {
  border-color: var(--accent);
}

.toast-success {
  border-color: var(--success);
}

.toast-error {
  border-color: var(--danger);
}

.toast-warning {
  border-color: var(--warning);
}

@keyframes toast-enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes panel-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.waiting-room-participants {
  margin-top: 1.5rem;
}

.avatar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(3.5rem, 1fr));
  gap: 0.75rem;
  margin-top: 0.85rem;
}

.participant-avatar {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.1rem;
  background: var(--accent-soft);
  color: var(--accent);
  border: 2px solid var(--accent);
  animation: avatar-pop 300ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  position: relative;
}

.participant-avatar::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: inherit;
  border: 2px solid var(--accent);
  opacity: 0;
  animation: avatar-ring 1.5s ease-out infinite;
}

@keyframes avatar-pop {
  from {
    opacity: 0;
    transform: scale(0);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes avatar-ring {
  0% {
    opacity: 0.6;
    transform: scale(1);
  }

  100% {
    opacity: 0;
    transform: scale(1.3);
  }
}

.waiting-animation {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 2rem;
  height: 4rem;
}

.pulse-ring {
  position: absolute;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.15;
  animation: pulse 2s ease-in-out infinite;
}

.pulse-ring:nth-child(1) {
  animation-delay: 0s;
}

.pulse-ring:nth-child(2) {
  animation-delay: 0.4s;
}

.pulse-ring:nth-child(3) {
  animation-delay: 0.8s;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(0.8);
    opacity: 0.15;
  }

  50% {
    transform: scale(1.2);
    opacity: 0.05;
  }
}

.option-result-tag {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  animation: tag-pop 300ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.option-result-tag.bad {
  background: var(--danger-bg);
  color: var(--danger);
}

.option-result-tag:not(.bad) {
  background: var(--success-bg);
  color: var(--success);
}

@keyframes tag-pop {
  from {
    opacity: 0;
    transform: scale(0.5);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.reveal-pop {
  animation: reveal-pop 400ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes reveal-pop {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.option-button.correct.reveal-pop {
  animation: correct-reveal 500ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.option-button.incorrect.reveal-pop {
  animation: incorrect-reveal 500ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes correct-reveal {
  0% {
    opacity: 0.6;
    transform: scale(0.95);
    border-color: var(--border);
  }

  50% {
    transform: scale(1.02);
  }

  100% {
    opacity: 1;
    transform: scale(1);
    border-color: var(--success);
  }
}

@keyframes incorrect-reveal {
  0% {
    opacity: 0.6;
    transform: scale(0.95);
    border-color: var(--border);
  }

  50% {
    transform: scale(1.02);
  }

  100% {
    opacity: 1;
    transform: scale(1);
    border-color: var(--danger);
  }
}

@media (max-width: 1024px) {
  .hero-grid,
  .split-layout,
  .studio-grid,
  .auth-layout,
  .live-layout,
  .analytics-columns {
    grid-template-columns: 1fr;
  }

  .stats-grid,
  .feature-grid,
  .analytics-summary-grid,
  .live-pulse-grid,
  .answer-status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-side-meta,
  .result-side {
    justify-items: start;
    text-align: left;
  }

  .hero-banner,
  .result-hero,
  .quiz-stage-header,
  .live-control-bar,
  .timer-dashboard {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 720px) {
  .shell-width {
    width: min(100% - 1.2rem, 100%);
  }

  .topbar,
  .topbar-cluster {
    flex-wrap: wrap;
  }

  .hero-copy,
  .hero-preview,
  .auth-card,
  .auth-aside,
  .hero-banner,
  .quiz-stage,
  .result-hero,
  .glass-card {
    border-radius: 22px;
  }

  .metric-strip,
  .stats-grid,
  .feature-grid,
  .catalog-grid,
  .form-grid,
  .builder-options,
  .result-mini-grid,
  .join-status-grid,
  .analytics-summary-grid,
  .live-pulse-grid,
  .answer-status-grid,
  .distribution-row {
    grid-template-columns: 1fr;
  }

  .form-actions,
  .hero-actions,
  .nav-actions {
    width: 100%;
  }

  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-ghost {
    width: 100%;
    justify-content: center;
  }

  .quiz-card-footer,
  .management-footer,
  .answer-card-header,
  .session-row,
  .participant-row {
    flex-direction: column;
    align-items: start;
  }

  .participant-score-stack {
    justify-items: start;
  }

  .leaderboard-modal-heading {
    align-items: start;
    flex-direction: column;
  }

  .student-live-board:not(.is-hidden) #student-live-leaderboard {
    max-height: 82vh;
  }
}

/* Light Theme */
[data-theme="light"] {
  color-scheme: light;
  
  /* Backgrounds */
  --bg: #f3f6fc;
  --bg-secondary: #e7edf7;
  --bg-tertiary: #dbe4f0;
  --bg-elevated: #ffffff;
  
  /* Cards & Panels */
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: rgba(255, 255, 255, 0.98);
  --panel-soft: rgba(255, 255, 255, 0.72);
  --panel-hover: rgba(255, 255, 255, 0.98);
  
  /* Text */
  --text: #0c1a2e;
  --text-secondary: #3a4a66;
  --muted: #4a5d78;
  --text-inverse: #f5f7fb;
  
  /* Borders */
  --border: rgba(12, 26, 48, 0.1);
  --border-strong: rgba(12, 26, 48, 0.16);
  --border-subtle: rgba(12, 26, 48, 0.08);
  --border-focus: rgba(31, 178, 255, 0.5);
  
  /* Shadows */
  --shadow: 0 18px 50px rgba(12, 26, 48, 0.1);
  --shadow-sm: 0 6px 20px rgba(12, 26, 48, 0.08);
  --shadow-lg: 0 24px 60px rgba(12, 26, 48, 0.12);
  --shadow-glow: 0 0 30px rgba(31, 178, 255, 0.2);
  
  /* Gradients */
  --gradient-surface: linear-gradient(160deg, #f3f6fc 0%, #e8eef8 100%);
  
  /* Colors - adjusted for light mode */
  --accent: hsl(196, 85%, 55%);
  --accent-strong: #1a8cdb;
  --accent-hover: #2a9de8;
  --accent-soft: rgba(31, 178, 255, 0.1);
  
  --warm: #e6a035;
  --warm-hover: #f0b045;
  --warm-soft: rgba(255, 190, 92, 0.12);
  
  --success: #2eb87a;
  --success-hover: #3dc88a;
  --success-soft: rgba(46, 184, 122, 0.12);
  --success-bg: rgba(46, 184, 122, 0.08);
  
  --danger: #e6555c;
  --danger-hover: #f0656c;
  --danger-soft: rgba(230, 85, 92, 0.12);
  --danger-bg: rgba(230, 85, 92, 0.08);
  
  --warning: #e6b834;
  --warning-hover: #f0c844;
  --warning-soft: rgba(230, 184, 52, 0.12);
  --warning-bg: rgba(230, 184, 52, 0.08);
  
  /* Hover States */
  --hover-bg: rgba(12, 26, 48, 0.05);
  --hover-bg-strong: rgba(12, 26, 48, 0.08);
  --hover-border: rgba(31, 178, 255, 0.4);
}

[data-theme="light"] body {
  background:
    radial-gradient(circle at top left, rgba(31, 178, 255, 0.14), transparent 28%),
    radial-gradient(circle at 80% 10%, rgba(255, 190, 92, 0.12), transparent 26%),
    linear-gradient(160deg, #f3f6fc 0%, #e8eef8 100%);
}

.quiz-header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.sound-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.timer-urgent {
  animation: timer-pulse 0.85s ease-in-out infinite;
  box-shadow: 0 0 0 2px rgba(255, 190, 92, 0.35);
}

@keyframes timer-pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.option-animate {
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.option-button.reveal-pop {
  animation: reveal-in 0.45s ease forwards;
}

@keyframes reveal-in {
  from {
    opacity: 0.55;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.option-result-tag {
  margin-left: auto;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--success-bg);
  color: var(--success);
}

.option-result-tag.bad {
  background: var(--danger-bg);
  color: var(--danger);
}

.distribution-row--enter {
  animation: dist-row-in 0.42s ease backwards;
  animation-delay: var(--bar-delay, 0ms);
}

.distribution-fill--animated {
  transition: width 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes dist-row-in {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.live-lb-row {
  transition: background 0.25s ease, transform 0.25s ease;
}

.leaderboard-item.lb-top {
  background: var(--accent-soft);
  border: 1px solid var(--hover-border);
  border-radius: var(--radius-md);
}

.bulk-dropzone {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  background: var(--panel-soft);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.bulk-dropzone.dropzone-active {
  border-color: var(--accent-strong);
  background: rgba(31, 178, 255, 0.08);
}

@media (max-width: 720px) {
  .quiz-header-tools {
    flex-direction: column;
    align-items: flex-end;
  }
}

/* Premium auth and centralized theme refinements */
[data-theme="light"] {
  --bg-primary: #f8fbff;
  --bg-secondary: #eef5ff;
  --surface-primary: rgba(255, 255, 255, 0.86);
  --surface-secondary: rgba(248, 251, 255, 0.78);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --card-bg: rgba(255, 255, 255, 0.9);
  --card-border: rgba(255, 255, 255, 0.78);
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: rgba(148, 163, 184, 0.42);
  --input-focus: #38bdf8;
  --button-primary: linear-gradient(135deg, #0ea5e9, #2563eb 54%, #4f46e5);
  --button-primary-hover: linear-gradient(135deg, #38bdf8, #2563eb 50%, #6366f1);
  --accent-primary: #0ea5e9;
  --accent-secondary: #2563eb;
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.06);
  --shadow-medium: 0 20px 80px rgba(59, 130, 246, 0.08);
  --shadow-strong: 0 32px 110px rgba(15, 23, 42, 0.14);
  --bg: var(--bg-primary);
  --panel: var(--glass-bg);
  --panel-strong: rgba(255, 255, 255, 0.96);
  --panel-soft: rgba(255, 255, 255, 0.7);
  --panel-hover: rgba(255, 255, 255, 0.98);
  --text: var(--text-primary);
  --muted: var(--text-muted);
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.16);
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-focus: rgba(56, 189, 248, 0.55);
  --accent: var(--accent-primary);
  --accent-strong: #2563eb;
  --accent-soft: rgba(14, 165, 233, 0.11);
  --gradient-primary: var(--button-primary);
  --shadow: var(--shadow-medium);
  --shadow-sm: var(--shadow-soft);
  --shadow-lg: var(--shadow-strong);
  --hover-bg: rgba(255, 255, 255, 0.74);
  --hover-bg-strong: rgba(255, 255, 255, 0.92);
  --hover-border: rgba(37, 99, 235, 0.28);
}

:root:not([data-theme="light"]) {
  --input-bg: rgba(10, 21, 37, 0.86);
  --input-border: rgba(177, 210, 255, 0.18);
  --button-primary: linear-gradient(135deg, #38bdf8, #2563eb 54%, #7c3aed);
  --button-primary-hover: linear-gradient(135deg, #67e8f9, #3b82f6 50%, #8b5cf6);
}

body {
  transition: background var(--transition-smooth), color var(--transition-smooth);
}

input,
select,
textarea {
  background: var(--input-bg);
  border-color: var(--input-border);
  color: var(--text);
}

select {
  color-scheme: dark;
}

select option {
  color: var(--text);
  background: var(--bg-secondary);
}

[data-theme="light"] select {
  color-scheme: light;
}

[data-theme="light"] select option {
  color: #0f172a;
  background: #ffffff;
}

input::placeholder,
textarea::placeholder {
  color: color-mix(in srgb, var(--text-muted) 78%, transparent);
}

.auth-page {
  min-height: 100vh;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 8% 8%, rgba(56, 189, 248, 0.13), transparent 30%),
    radial-gradient(circle at 92% 82%, rgba(37, 99, 235, 0.1), transparent 35%),
    linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 45%, #ffffff 100%);
}

[data-theme="light"] body.auth-page {
  background:
    radial-gradient(circle at 8% 8%, rgba(56, 189, 248, 0.13), transparent 30%),
    radial-gradient(circle at 92% 82%, rgba(37, 99, 235, 0.1), transparent 35%),
    linear-gradient(135deg, #f8fbff 0%, #eef5ff 45%, #ffffff 100%);
}

:root:not([data-theme="light"]) .auth-page {
  background:
    radial-gradient(circle at 8% 8%, rgba(56, 189, 248, 0.2), transparent 30%),
    radial-gradient(circle at 92% 82%, rgba(124, 58, 237, 0.18), transparent 34%),
    linear-gradient(145deg, #050b16 0%, #071426 46%, #0b1020 100%);
}

.auth-page::before,
.auth-page::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: -1;
  opacity: 0.72;
  filter: blur(34px);
  animation: auth-ambient-drift 12s ease-in-out infinite alternate;
}

.auth-page::before {
  width: 34rem;
  height: 34rem;
  top: -12rem;
  right: 10vw;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18), transparent 68%);
}

.auth-page::after {
  width: 28rem;
  height: 28rem;
  left: -10rem;
  bottom: -10rem;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12), transparent 70%);
  animation-delay: -5s;
}

@keyframes auth-ambient-drift {
  from {
    transform: translate3d(-1.2rem, 0.6rem, 0) scale(1);
  }

  to {
    transform: translate3d(1.4rem, -0.9rem, 0) scale(1.06);
  }
}

.auth-page .background-orb {
  opacity: 0.18;
  filter: blur(64px);
}

[data-theme="light"] .auth-page .background-orb {
  opacity: 0.22;
  mix-blend-mode: multiply;
}

.auth-page .topbar {
  padding-top: 1.6rem;
  animation: auth-rise 520ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-page .brand-mark {
  color: var(--text-primary);
}

.auth-page .auth-layout {
  grid-template-columns: minmax(360px, 0.95fr) minmax(320px, 0.78fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: center;
  min-height: calc(100vh - 7.6rem);
  padding: 1rem 0 4rem;
}

.auth-page .glass-card {
  background: var(--glass-bg);
  border-color: var(--card-border);
  box-shadow: var(--shadow-soft), var(--shadow-medium);
  backdrop-filter: blur(24px) saturate(145%);
  -webkit-backdrop-filter: blur(24px) saturate(145%);
}

.auth-card,
.auth-aside {
  position: relative;
  overflow: hidden;
  border-radius: 32px;
  transition:
    transform var(--transition-smooth),
    box-shadow var(--transition-smooth),
    border-color var(--transition-smooth),
    background var(--transition-smooth);
}

.auth-page .auth-card {
  padding: clamp(2rem, 4vw, 3.25rem);
  align-self: center;
  animation: auth-rise 680ms cubic-bezier(0.16, 1, 0.3, 1) 80ms both;
}

.auth-page .auth-aside {
  min-height: 520px;
  padding: clamp(1.75rem, 3.4vw, 3rem);
  justify-content: space-between;
  isolation: isolate;
  animation: auth-rise 760ms cubic-bezier(0.16, 1, 0.3, 1) 160ms both;
}

.auth-card::before,
.auth-aside::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.42), transparent 26%, transparent 62%, rgba(56, 189, 248, 0.1)),
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.16), transparent 35%);
  opacity: 0.78;
  pointer-events: none;
}

:root:not([data-theme="light"]) .auth-card::before,
:root:not([data-theme="light"]) .auth-aside::before {
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.12), transparent 28%, transparent 66%, rgba(124, 58, 237, 0.12)),
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.18), transparent 38%);
}

.auth-card > *,
.auth-aside > * {
  position: relative;
  z-index: 1;
}

.auth-card:hover,
.auth-aside:hover {
  transform: translateY(-6px) scale(1.01);
  border-color: color-mix(in srgb, var(--accent-primary) 28%, var(--card-border));
  box-shadow: var(--shadow-medium), var(--shadow-strong);
}

.auth-page .eyebrow {
  color: var(--accent-primary);
  letter-spacing: 0.18em;
}

.auth-page h1 {
  max-width: 11ch;
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: clamp(3rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.06em;
}

.auth-page h2 {
  color: var(--text-primary);
  font-size: clamp(1.7rem, 2.7vw, 2.55rem);
  line-height: 1.05;
}

.auth-page .muted-copy,
.auth-page .helper-text,
.auth-page .auth-meta {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

.auth-page .auth-card > .muted-copy {
  max-width: 42rem;
  margin-bottom: 1.6rem;
}

.auth-page .stack-form {
  gap: 1.05rem;
}

.auth-page .input-group {
  gap: 0.55rem;
}

.auth-page .input-group span {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 700;
}

.auth-page input,
.auth-page select {
  min-height: 58px;
  padding: 0 18px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), transparent),
    var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
  transition:
    transform var(--transition-smooth),
    border-color var(--transition-smooth),
    background var(--transition-smooth),
    box-shadow var(--transition-smooth);
}

.auth-page select {
  appearance: none;
  background-image:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), transparent),
    linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position:
    0 0,
    calc(100% - 22px) 25px,
    calc(100% - 16px) 25px;
  background-size:
    auto,
    6px 6px,
    6px 6px;
  background-repeat: no-repeat;
  padding-right: 3rem;
}

.auth-page input:focus,
.auth-page select:focus {
  transform: translateY(-1px);
  border-color: var(--input-focus);
  background-color: var(--input-bg);
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--input-focus) 18%, transparent),
    0 10px 25px color-mix(in srgb, var(--input-focus) 16%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.36);
}

.auth-page input:hover,
.auth-page select:hover {
  border-color: color-mix(in srgb, var(--input-focus) 48%, var(--input-border));
}

.auth-page .btn {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.auth-page .btn-primary {
  min-height: 58px;
  color: #ffffff;
  background: var(--button-primary);
  background-size: 180% 180%;
  box-shadow:
    0 14px 32px rgba(37, 99, 235, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  animation: auth-gradient-shift 8s ease infinite;
}

.auth-page .btn-primary:hover {
  background: var(--button-primary-hover);
  background-size: 180% 180%;
  box-shadow:
    0 10px 30px rgba(37, 99, 235, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}

.auth-page .btn-primary:active {
  transform: scale(0.98);
}

.auth-page .btn-secondary,
.auth-page .btn-ghost {
  color: var(--text-primary);
  background: color-mix(in srgb, var(--glass-bg) 86%, transparent);
  border-color: var(--card-border);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.05);
  backdrop-filter: blur(16px);
}

.auth-page .theme-toggle {
  min-width: 4.25rem;
}

.auth-meta a {
  color: var(--accent-primary);
  font-weight: 800;
}

.auth-aside-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.3rem;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--accent-primary);
  background: color-mix(in srgb, var(--accent-primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-primary) 24%, transparent);
  font-size: 0.82rem;
  font-weight: 800;
}

.live-indicator::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 0.4rem color-mix(in srgb, var(--accent-primary) 14%, transparent);
  animation: auth-pulse 1.8s ease-in-out infinite;
}

.auth-preview-panel {
  display: grid;
  gap: 1rem;
  margin: 1rem 0;
  padding: 1.2rem;
  border: 1px solid color-mix(in srgb, var(--accent-primary) 16%, var(--card-border));
  border-radius: 24px;
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--accent-primary) 18%, transparent), transparent 46%),
    color-mix(in srgb, var(--glass-bg) 86%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), var(--shadow-soft);
}

.auth-preview-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--text-secondary);
  font-weight: 800;
}

.auth-preview-header strong {
  color: var(--accent-primary);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.6rem;
}

.auth-preview-bars {
  display: grid;
  gap: 0.7rem;
}

.auth-preview-bars span {
  display: block;
  width: var(--bar);
  height: 0.62rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent-primary) 18%, transparent);
  animation: auth-bar-in 900ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-preview-bars span:nth-child(2) {
  animation-delay: 100ms;
}

.auth-preview-bars span:nth-child(3) {
  animation-delay: 180ms;
}

.auth-preview-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.auth-preview-steps span {
  min-height: 5rem;
  border-radius: 18px;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent-primary) 20%, transparent), transparent),
    color-mix(in srgb, var(--glass-bg) 90%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-primary) 18%, transparent);
  animation: auth-step-float 4s ease-in-out infinite;
}

.auth-preview-steps span:nth-child(2) {
  animation-delay: -1.2s;
}

.auth-preview-steps span:nth-child(3) {
  animation-delay: -2.4s;
}

.auth-page .feature-list {
  gap: 1rem;
}

.auth-page .feature-list li {
  padding: 0.95rem 1rem 0.95rem 2.65rem;
  border-radius: 18px;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--glass-bg) 76%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-border) 76%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.auth-page .feature-list li::before {
  left: 1rem;
  top: 1.3rem;
  background: var(--accent-primary);
  box-shadow: 0 0 0 0.35rem color-mix(in srgb, var(--accent-primary) 12%, transparent);
}

.auth-page .inline-note {
  border-color: color-mix(in srgb, var(--warning) 42%, transparent);
  background: color-mix(in srgb, var(--warning) 12%, var(--glass-bg));
}

@keyframes auth-rise {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes auth-gradient-shift {
  0%,
  100% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }
}

@keyframes auth-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.8;
  }

  50% {
    transform: scale(1.25);
    opacity: 1;
  }
}

@keyframes auth-bar-in {
  from {
    width: 0;
    opacity: 0;
  }

  to {
    width: var(--bar);
    opacity: 1;
  }
}

@keyframes auth-step-float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-6px);
  }
}

@media (max-width: 1024px) {
  .auth-page .auth-layout {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .auth-page .auth-aside {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .auth-page .topbar {
    padding-top: 1rem;
  }

  .auth-page .auth-layout {
    padding: 0.4rem 0 2rem;
    gap: 1rem;
  }

  .auth-page .auth-card,
  .auth-page .auth-aside {
    border-radius: 24px;
    padding: 1.35rem;
  }

  .auth-page h1 {
    max-width: 100%;
    font-size: clamp(2.35rem, 11vw, 3rem);
    letter-spacing: -0.045em;
  }

  .auth-aside-topline {
    align-items: flex-start;
    flex-direction: column;
  }

  .auth-page .nav-actions {
    justify-content: stretch;
  }

  .auth-page .theme-toggle {
    min-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .auth-page *,
  .auth-page::before,
  .auth-page::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}