:root {
  color-scheme: dark;
  --bg: #0b0f12;
  --surface: rgba(17, 23, 29, 0.86);
  --surface-strong: #121922;
  --text: #f3f5f7;
  --muted: #9aa5b1;
  --accent: #ffb454;
  --accent-strong: #ff8f1f;
  --accent-cool: #4fd1c5;
  --border: rgba(255, 255, 255, 0.08);
  --success: #4ade80;
  --error: #f87171;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  --glow: 0 12px 30px rgba(255, 180, 84, 0.2);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Sora", "Noto Sans", sans-serif;
  background: radial-gradient(circle at 15% 20%, rgba(79, 209, 197, 0.14), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(255, 180, 84, 0.2), transparent 35%),
    linear-gradient(180deg, #0b0f12 0%, #0c1218 55%, #0a0e12 100%);
  color: var(--text);
  line-height: 1.5;
}

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

a:hover {
  color: var(--accent);
}

img {
  max-width: 100%;
}

button,
select,
input {
  font-family: inherit;
  color: var(--text);
}

button,
select {
  background: linear-gradient(135deg, rgba(255, 180, 84, 0.18), rgba(255, 180, 84, 0.05));
  border: 1px solid var(--border);
  padding: 9px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: border 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}

button:hover,
select:hover {
  border-color: rgba(255, 180, 84, 0.6);
  box-shadow: 0 0 0 3px rgba(255, 180, 84, 0.12);
}

button:active {
  transform: translateY(1px);
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid rgba(255, 180, 84, 0.8);
  outline-offset: 2px;
}

.site-header {
  padding: 28px 26px 16px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.brand-title {
  display: flex;
  gap: 14px;
  align-items: center;
}

.brand-title h1 {
  margin: 0;
  font-family: "Fraunces", "Space Grotesk", serif;
  font-size: 28px;
  letter-spacing: 0.2px;
}

.brand-sub {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255, 180, 84, 0.9), rgba(255, 143, 31, 0.9));
  color: #1a1209;
  font-weight: 700;
  box-shadow: var(--glow);
}

.header-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.ghost-link {
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 8px 14px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.02);
}

.arabic-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: linear-gradient(120deg, rgba(201, 162, 39, 0.2), rgba(201, 162, 39, 0.08));
  border: 1px solid rgba(201, 162, 39, 0.45);
  border-radius: 12px;
  color: #f4d36b;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.arabic-link small {
  font-size: 11px;
  color: #b8b1a2;
  font-weight: 500;
}

.arabic-link:hover {
  box-shadow: 0 8px 18px rgba(201, 162, 39, 0.2);
}

.shell {
  max-width: 1380px;
  margin: 0 auto;
  padding: 20px 26px 60px;
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: 20px;
}

.side-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel-title {
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.accordion > summary.panel-title {
  margin-bottom: 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  border-radius: 12px;
  user-select: none;
}

.accordion > summary.panel-title:hover {
  background: rgba(255, 255, 255, 0.04);
}

.accordion > summary.panel-title::-webkit-details-marker {
  display: none;
}

.accordion > summary.panel-title::after {
  content: "+";
  font-size: 16px;
  color: var(--muted);
  transition: transform 0.2s ease, color 0.2s ease;
}

.accordion[open] > summary.panel-title::after {
  content: "-";
  color: var(--text);
}

.accordion-body {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-body {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.panel-hint {
  font-size: 12px;
  color: var(--muted);
}

.panel-hint.small {
  color: #7c8794;
  margin-top: 6px;
}

.data-health {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.data-metric {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.data-metric strong {
  font-size: 18px;
  font-weight: 700;
  color: #f7dfb8;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.step {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: start;
}

.step span {
  width: 28px;
  height: 28px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(79, 209, 197, 0.16);
  color: var(--accent-cool);
  font-weight: 700;
}

.step strong {
  font-weight: 600;
}

.step p {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.primary-btn {
  width: 100%;
  margin-top: 12px;
  background: linear-gradient(135deg, rgba(255, 180, 84, 0.9), rgba(255, 143, 31, 0.85));
  border: none;
  color: #1a1209;
  font-weight: 700;
  box-shadow: var(--glow);
}

.primary-btn:hover {
  box-shadow: 0 12px 26px rgba(255, 180, 84, 0.28);
}

.ghost-btn {
  background: rgba(255, 255, 255, 0.04);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mode-btn {
  text-align: left;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.02);
}

.mode-btn.is-active {
  border-color: rgba(255, 180, 84, 0.8);
  box-shadow: inset 0 0 0 1px rgba(255, 180, 84, 0.6), 0 6px 16px rgba(255, 180, 84, 0.18);
  background: linear-gradient(135deg, rgba(255, 180, 84, 0.3), rgba(255, 180, 84, 0.1));
}

.timer-controls {
  justify-content: space-between;
}

.timer-display {
  margin-top: 8px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

#timer-remaining {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent-cool);
  letter-spacing: 1px;
}

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

.status.small {
  font-size: 12px;
}

.label {
  font-size: 13px;
  color: var(--muted);
}

.content-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  width: 100%;
  background: linear-gradient(180deg, rgba(18, 24, 33, 0.95), rgba(14, 20, 28, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: rise 0.5s ease-out;
}

.card.hidden {
  display: none;
}

.card-header {
  display: flex;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
}

.word {
  font-size: 28px;
  font-weight: 700;
  color: #ffd7a0;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 10px;
}

.tag {
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 180, 84, 0.18);
  border: 1px solid rgba(255, 180, 84, 0.25);
  font-size: 12px;
}

.level {
  background: rgba(79, 209, 197, 0.12);
  border-color: rgba(79, 209, 197, 0.35);
  color: #baf4ed;
}

.definition {
  margin: 0;
  font-size: 18px;
  line-height: 1.55;
}

.block h3 {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.block ul {
  margin: 0;
  padding-left: 18px;
}

.block p {
  margin: 0;
}

.quiz .options {
  display: grid;
  gap: 8px;
  margin-top: 8px;
}

.card-actions {
  display: flex;
  justify-content: stretch;
  width: 100%;
}

.accent-btn {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 180, 84, 0.7);
  background: linear-gradient(135deg, rgba(255, 180, 84, 0.3), rgba(255, 180, 84, 0.1));
  font-weight: 700;
  width: 100%;
}

.quiz .options button {
  text-align: left;
}

.quiz .options button.correct {
  border-color: var(--success);
  color: var(--success);
}

.quiz .options button.wrong {
  border-color: var(--error);
  color: var(--error);
}

.quiz-result {
  margin-top: 6px;
  font-weight: 600;
}

.grammar-panel {
  background: linear-gradient(180deg, rgba(16, 22, 30, 0.95), rgba(12, 18, 26, 0.95));
}

.grammar-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.grammar-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 14px;
}

.grammar-filter {
  flex: 1 1 220px;
  min-width: 180px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  outline: none;
}

.grammar-meta {
  background: rgba(79, 209, 197, 0.16);
  border-color: rgba(79, 209, 197, 0.35);
  color: #c8f4ed;
}

.grammar-detail {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.grammar-detail h4 {
  margin: 0 0 6px;
  color: #f5f3ed;
}

.grammar-detail p {
  margin: 6px 0;
}

.grammar-detail ul {
  margin: 8px 0;
  padding-left: 18px;
}

.grammar-detail .note {
  color: var(--muted);
  font-size: 13px;
}

.grammar-tr {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(79, 209, 197, 0.25);
  background: rgba(79, 209, 197, 0.08);
  color: #e9f6f4;
}

.grammar-tr-title {
  margin-top: 8px;
  color: #e9f6f4;
}

.grammar-tr-list {
  margin: 6px 0 2px;
  padding-left: 18px;
  color: #dff2ee;
}

.grammar-detail .tr-note {
  border-left: 3px solid rgba(79, 209, 197, 0.4);
  padding-left: 10px;
}

.grammar-exercises {
  border: 1px dashed rgba(79, 209, 197, 0.35);
  border-radius: 10px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.02);
}

.exercise-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.exercise-toggle {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(79, 209, 197, 0.4);
  font-size: 12px;
  font-weight: 600;
  color: #c8f4ed;
}

.exercise-item {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.exercise-item:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.exercise-q {
  margin: 0 0 6px;
  font-weight: 600;
}

.exercise-options {
  margin: 6px 0;
  padding-left: 18px;
}

.grammar-exercises .exercise-answer,
.grammar-exercises .exercise-note {
  display: none;
}

.grammar-exercises[data-revealed="true"] .exercise-answer,
.grammar-exercises[data-revealed="true"] .exercise-note {
  display: block;
}

.exercise-answer {
  margin: 4px 0 0;
  color: #c8f4ed;
  font-weight: 600;
}

.exercise-note {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.example-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.example-controls input {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.fill-btn {
  width: 100%;
  background: linear-gradient(135deg, rgba(79, 209, 197, 0.3), rgba(79, 209, 197, 0.12));
  border: 1px solid rgba(79, 209, 197, 0.6);
}

.reading-card {
  border: 1px solid rgba(79, 209, 197, 0.35);
}

.reading-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.reading-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 14px;
}

.exam-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 100;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: min(960px, 92vw);
  max-height: 90vh;
  overflow: auto;
  padding: 12px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .side-stack {
    position: static;
  }

  .mode-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 24px 18px 12px;
  }

  .shell {
    padding: 16px 18px 40px;
  }

  .brand-title h1 {
    font-size: 24px;
  }

  .word {
    font-size: 24px;
  }

  .definition {
    font-size: 16px;
  }

  .mode-grid {
    grid-template-columns: 1fr;
  }

  #timer-remaining {
    font-size: 30px;
  }

  .data-health {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}