:root {
  --primary: #ff4da6;
  --primary-soft: #ff99cc;
  --accent: #ffe6f5;
  --text: #ffffff;
  --muted: #dddddd;
  --bg-gradient: radial-gradient(circle at top, #2a1038 0, #08040b 40%, #000000 100%);
  --bg-overlay: radial-gradient(circle at 0 0, rgba(255, 77, 166, 0.25), transparent 60%),
                radial-gradient(circle at 100% 0, rgba(160, 100, 255, 0.25), transparent 60%);
  --card-gradient: linear-gradient(135deg, rgba(255, 77, 166, 0.08), rgba(17, 17, 17, 0.96));
  --card-border: rgba(255, 255, 255, 0.12);
  --card-glow: radial-gradient(circle, rgba(255, 255, 255, 0.18) 0, transparent 55%),
               radial-gradient(circle, rgba(255, 77, 166, 0.24) 0, transparent 60%);
  --badge-bg: rgba(10, 5, 15, 0.8);
  --sidebar-bg: rgba(10, 6, 16, 0.9);
  --control-bg: #120b18;
  --option-bg: rgba(12, 8, 18, 0.95);
  --option-border: rgba(255, 255, 255, 0.25);
  --button-border: rgba(255, 255, 255, 0.25);
  --primary-btn: linear-gradient(90deg, #ff4da6, #ff99cc);
  --primary-btn-text: #1b0512;
  --modal-bg: #120a18;
  --modal-border: rgba(255, 255, 255, 0.2);
  --hero-image: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg-gradient);
  overflow-x: hidden;
}

/* Animated background glow */
body::before {
  content: "";
  position: fixed;
  inset: -50px;
  background: var(--bg-overlay);
  opacity: 0.7;
  mix-blend-mode: screen;
  animation: bgMove 14s linear infinite alternate;
  pointer-events: none;
  z-index: -1;
}

/* Optional theme hero image */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center;
  opacity: 0.08;
  filter: blur(6px);
  z-index: -2;
  pointer-events: none;
}

@keyframes bgMove {
  0% { transform: translate3d(0, 0, 0); }
  100% { transform: translate3d(-40px, 40px, 0); }
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
  margin-bottom: 16px;
}

.hero {
  width: 100%;
  height: 140px;
  position: relative;
  border-radius: 18px;
  background-image: var(--hero-image);
  background-size: cover;
  background-position: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.55);
  filter: saturate(1.05);
}

.hero-controls {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(18, 10, 24, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: var(--primary-soft);
  font-size: 13px;
}

.theme-chip select {
  background: rgba(0, 0, 0, 0.7);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.4);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  appearance: none;
}

.theme-chip select option {
  background: #0d0913;
  color: #ffffff;
}

.theme-chip select:focus {
  outline: 1px solid var(--primary);
}

.logo-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  text-shadow: 0 0 12px var(--primary-soft);
}

.subtitle {
  font-size: 14px;
  color: var(--muted);
}

.mode-note {
  font-size: 12px;
  color: var(--accent);
  opacity: 0.9;
}

.top-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 13px;
  color: var(--accent);
}

.stats-row {
  flex-wrap: nowrap;
  align-items: center;
  gap: 10px;
}

.stats-row .btn {
  padding: 6px 12px;
}

.filter-panel {
  width: 100%;
  background: var(--sidebar-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 8px 10px 10px;
  margin-top: 4px;
}

.filter-panel summary {
  list-style: none;
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: var(--control-bg);
  color: var(--primary-soft);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.filter-panel summary::-webkit-details-marker {
  display: none;
}

.filter-panel summary::after {
  content: '▾';
  color: var(--primary);
  font-size: 14px;
}

.filter-panel[open] summary {
  border-color: var(--primary);
}

.filter-panel[open] summary::after {
  content: '▴';
}

.filter-grid {
  margin-top: 10px;
}

.badge {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--badge-bg);
}

.badge-strong {
  border-color: var(--primary);
  color: var(--primary-soft);
}

select {
  background: var(--control-bg);
  color: var(--text);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  padding: 4px 10px;
  font-size: 13px;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(220px, 1.1fr);
  gap: 16px;
}

.card {
  background: var(--card-gradient);
  border-radius: 18px;
  padding: 16px 14px 18px;
  border: 1px solid var(--card-border);
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.85);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: -60%;
  background-image: var(--card-glow);
  mix-blend-mode: screen;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}

.card.glitter::before {
  opacity: 1;
  animation: glitter 1s ease-out forwards;
}

@keyframes glitter {
  0% { transform: translate(-10%, -10%) scale(1); opacity: 1; }
  100% { transform: translate(10%, 10%) scale(1.2); opacity: 0; }
}

.question-text {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.question-meta {
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.rule-link {
  color: var(--primary-soft);
  text-decoration: underline;
  cursor: pointer;
  font-size: 12px;
}

.options {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-btn {
  background: var(--option-bg);
  border-radius: 999px;
  border: 1px solid var(--option-border);
  padding: 10px 14px;
  color: var(--text);
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s, background 0.12s;
}

.option-enter {
  opacity: 0;
  animation: optionIn 0.35s ease forwards;
}

.option-btn:nth-child(1).option-enter { animation-delay: 40ms; }
.option-btn:nth-child(2).option-enter { animation-delay: 80ms; }
.option-btn:nth-child(3).option-enter { animation-delay: 120ms; }
.option-btn:nth-child(4).option-enter { animation-delay: 160ms; }

@keyframes optionIn {
  from { opacity: 0; transform: translateY(6px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.option-btn span.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  margin-right: 8px;
  font-size: 13px;
  color: var(--primary-soft);
}

.option-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 10px var(--primary);
  border-color: var(--primary);
}

.option-btn.correct {
  background: linear-gradient(90deg, #158a5b, #19b36f);
  border-color: #19b36f;
}

.option-btn.incorrect {
  background: linear-gradient(90deg, #b31255, #f5426c);
  border-color: #ff8a80;
}

.option-btn.disabled {
  pointer-events: none;
  opacity: 0.85;
}

.feedback {
  margin-top: 10px;
  font-size: 14px;
  text-align: left;
  padding: 10px 12px;
  border-radius: 12px;
}

.feedback.correct {
  background: rgba(25, 178, 111, 0.15);
  border: 1px solid #19b36f;
}

.feedback.incorrect {
  background: rgba(244, 67, 54, 0.18);
  border: 1px solid #ff8a80;
}

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  gap: 8px;
  flex-wrap: nowrap;
}

.btn {
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid var(--button-border);
  background: var(--option-bg);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: auto;
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  justify-content: center;
  font-size: 18px;
}

.btn-ghost {
  background: transparent;
  border-color: var(--button-border);
  color: var(--primary-soft);
}

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

.btn-primary {
  border-color: var(--primary);
  background: var(--primary-btn);
  color: var(--primary-btn-text);
  font-weight: 600;
  box-shadow: 0 0 12px var(--primary);
}

.btn-primary:disabled {
  opacity: 0.4;
  box-shadow: none;
  cursor: default;
}

.stats {
  font-size: 13px;
  color: var(--accent);
}

.sidebar-section {
  margin-bottom: 14px;
}

.sidebar-title {
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--primary-soft);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.topic-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 8px;
  border-radius: 10px;
  background: var(--sidebar-bg);
  border: 1px solid var(--card-border);
  margin-bottom: 6px;
}

.topic-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.topic-progress-bar {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.topic-progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #19b36f, #8bc34a);
  transition: width 0.2s;
}

.topic-badge-bad {
  color: #ff8a80;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  margin-top: 4px;
}

.history-table th,
.history-table td {
  padding: 4px 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  text-align: left;
}

.history-table th {
  font-weight: 600;
  color: var(--primary-soft);
}

.history-empty {
  font-size: 12px;
  color: #aaa;
  margin-top: 4px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal-backdrop.show {
  display: flex;
}

.modal {
  max-width: 520px;
  width: 92%;
  background: var(--modal-bg);
  border-radius: 18px;
  padding: 16px 18px 18px;
  border: 1px solid var(--modal-border);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.85);
  text-align: left;
}

.modal h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--primary-soft);
}

.modal p {
  font-size: 14px;
  margin: 4px 0;
}

.link-rule {
  color: var(--primary-soft);
  text-decoration: underline;
  font-size: 13px;
}

.rule-media {
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.rule-media iframe,
.rule-media video {
  width: 100%;
  max-height: 320px;
  aspect-ratio: 16 / 9;
  height: auto;
  border: none;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
}

@media (max-width: 900px) {
  .app {
    padding: 16px 14px 28px;
  }

  .hero {
    height: 120px;
  }

  .logo-title {
    font-size: 22px;
  }

  .subtitle {
    font-size: 13px;
  }

  .top-bar {
    gap: 6px;
  }
}

@media (max-width: 1024px) {
  .top-bar {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .top-bar::-webkit-scrollbar {
    display: none;
  }

  main {
    grid-template-columns: minmax(0, 1fr);
  }

  .card {
    padding: 14px 12px 16px;
  }

  .question-text {
    font-size: 16px;
  }

  .options {
    gap: 10px;
  }
}

@media (max-width: 820px) and (orientation: portrait) {
  .app {
    padding: 14px 12px 26px;
    width: 100%;
  }

  header {
    gap: 12px;
  }

  .top-bar {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .top-bar .badge {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
  }

  .top-bar select {
    flex: 1;
  }

  .stats-row {
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: center;
  }

  main {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card {
    padding: 12px 12px 16px;
  }

  .question-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .rule-actions-inline {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .sidebar-section {
    padding-top: 2px;
  }

  .modal {
    width: calc(100% - 28px);
    max-height: 92vh;
    overflow: auto;
  }

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

@media (max-width: 520px) {
  .app {
    padding: 12px 10px 22px;
  }

  .hero {
    height: 100px;
  }

  .logo-title {
    font-size: 19px;
    letter-spacing: 0.05em;
  }

  .badge {
    font-size: 12px;
    padding: 4px 9px;
  }

  select {
    font-size: 12px;
  }

  .history-table th,
  .history-table td {
    font-size: 11px;
    padding: 4px;
  }
}


.rule-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0 12px;
}

.pill-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
  color: var(--primary-soft);
  text-decoration: none;
  font-size: 13px;
  transition: all 0.15s ease;
}

.pill-link:hover {
  border-color: var(--primary);
  color: var(--text);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
}

.rule-text {
  font-size: 14px;
  line-height: 1.5;
  margin: 6px 0 10px;
}

.rule-media {
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

  .rule-media.portrait iframe,
  .rule-media.portrait video {
    width: 100%;
    max-width: 360px;
    aspect-ratio: 9 / 16;
    height: auto;
    max-height: 70vh;
    border: none;
    border-radius: 14px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.5);
    object-fit: cover;
  }


.rule-actions-inline {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}