:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0b1220;
  color: #e8eef9;
  accent-color: #7c3aed;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(124, 58, 237, 0.16), transparent 28%),
    radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.14), transparent 22%),
    linear-gradient(180deg, #08101d 0%, #0d1726 100%);
}

.page-header {
  padding: 40px 24px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.page-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 24px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.85rem;
  margin: 0 0 12px;
  color: #a5b4fc;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3.2rem);
  line-height: 1.05;
}

p {
  margin: 0;
  color: #cfd8f5;
  line-height: 1.75;
}

.search-wrapper {
  display: grid;
  gap: 10px;
  align-self: end;
  max-width: 420px;
}

label {
  font-size: 0.95rem;
}

input[type="search"] {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 23, 42, 0.9);
  color: #f8fafc;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="search"]:focus {
  border-color: #7c3aed;
  box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.12);
}

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  padding: 24px;
  border-radius: 24px;
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
  min-height: 190px;
  display: grid;
  gap: 12px;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(124, 58, 237, 0.35);
  background: rgba(24, 31, 53, 0.95);
}

.card h2 {
  margin: 0;
  font-size: 1.2rem;
}

.card p {
  margin: 0;
  color: #d3d9f2;
}

.card-pronunciation {
  align-self: end;
  color: #a5b4fc;
  font-size: 0.85rem;
  line-height: 1.5;
}

.card-listen,
.secondary-button {
  width: fit-content;
  padding: 9px 13px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
  cursor: pointer;
}

.audio-status:empty {
  display: none;
}

.view-toggle {
  display: flex;
  gap: 12px;
  margin: 20px 24px 0;
  justify-content: center;
}

.view-toggle__button {
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: #e2e8f0;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.view-toggle__button:hover {
  transform: translateY(-1px);
}

.view-toggle__button--active {
  background: rgba(124, 58, 237, 0.95);
  border-color: rgba(124, 58, 237, 0.95);
  color: white;
}

.quiz-mode {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.quiz-mode__button {
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: #e2e8f0;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.quiz-mode__button:hover {
  transform: translateY(-1px);
}

.quiz-mode__button--active {
  background: rgba(124, 58, 237, 0.95);
  border-color: rgba(124, 58, 237, 0.95);
  color: white;
}

.cards-section {
  display: none;
}

.cards-section.active {
  display: grid;
}

.quiz-panel {
  display: none;
  margin-top: 40px;
  padding: 28px;
  border-radius: 26px;
  background: rgba(15, 23, 42, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.learn-panel {
  display: none;
  margin-top: 40px;
  padding: 28px;
  border-radius: 26px;
  background: rgba(15, 23, 42, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.learn-panel.active {
  display: block;
}

.learn-header {
  display: grid;
  gap: 12px;
  max-width: 720px;
}

.study-settings,
.typing-direction {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}

.study-settings select,
.typing-direction select,
.typing-answer input {
  min-height: 42px;
  padding: 9px 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  background: #111b2d;
  color: #e8eef9;
}

.study-due-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.practice-settings {
  margin-bottom: 18px;
}

.learn-card {
  width: min(100%, 760px);
  min-height: 300px;
  margin: 24px auto 0;
  padding: clamp(22px, 5vw, 48px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  text-align: center;
  border-radius: 24px;
  background: rgba(8, 14, 30, 0.96);
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.learn-progress {
  color: #cbd5e1;
  font-weight: 600;
}

.learn-card h3 {
  margin: 0;
  color: #f8fafc;
  font-size: clamp(1.8rem, 5vw, 2.8rem);
}

.learn-pronunciation {
  color: #a5b4fc;
}

.speaking-actions,
.review-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

.review-actions {
  margin-top: 8px;
}

.review-actions button,
.typing-answer button {
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  background: rgba(124, 58, 237, 0.78);
  color: white;
  cursor: pointer;
}

.learn-example {
  width: 100%;
  display: grid;
  gap: 8px;
  color: #cfd8f5;
}

.learn-example:empty {
  display: none;
}

.learning-note {
  color: #fbbf24;
  font-size: 0.92rem;
}

.study-status {
  min-height: 1.4rem;
  color: #a5b4fc;
  font-size: 0.9rem;
}

.learn-translation {
  min-height: 1.75rem;
  color: #e2e8f0;
  font-size: 1.2rem;
  font-weight: 600;
}

.learn-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  width: 100%;
  margin-top: 8px;
}

.learn-actions button,
.learn-start {
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: rgba(124, 58, 237, 0.95);
  color: white;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

.learn-actions button:hover:not(:disabled),
.learn-start:hover {
  background: #9333ea;
  transform: translateY(-1px);
}

.learn-actions button:disabled {
  opacity: 0.4;
  cursor: default;
}

.learn-start {
  align-self: center;
}

.quiz-panel.active {
  display: block;
}

.quiz-header {
  display: grid;
  gap: 12px;
  max-width: 720px;
}

.quiz-card {
  margin-top: 18px;
  display: grid;
  gap: 16px;
  padding: 22px;
  border-radius: 24px;
  background: rgba(8, 14, 30, 0.96);
  border: 1px solid rgba(124, 58, 237, 0.12);
}

.typing-answer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.typing-answer input {
  flex: 1 1 220px;
}

.typing-answer input:disabled {
  opacity: 0.6;
}

.quiz-question {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: baseline;
  font-size: 1rem;
}

.quiz-question strong {
  font-size: 1.45rem;
  color: #f8fafc;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.quiz-option {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  color: #e2e8f0;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.quiz-option:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: #7c3aed;
  background: rgba(124, 58, 237, 0.18);
}

.quiz-option:disabled {
  opacity: 0.65;
  cursor: default;
}

.quiz-option--selected {
  border-color: #22c55e;
}

.quiz-option--correct {
  background: rgba(34, 197, 94, 0.12);
  border-color: #16a34a;
  color: #eaffef;
  box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.04);
}

.quiz-option--wrong {
  background: rgba(239, 68, 68, 0.08);
  border-color: #ef4444;
  color: #ffecec;
  box-shadow: 0 0 0 6px rgba(239, 68, 68, 0.03);
}

.quiz-feedback {
  min-height: 1.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.quiz-feedback--correct {
  color: #86efac;
}

.quiz-feedback--wrong {
  color: #fca5a5;
}

.quiz-actions {
  display: none;
  flex-wrap: wrap;
  gap: 12px;
}

.quiz-actions button {
  padding: 12px 18px;
  border: none;
  border-radius: 14px;
  background: #7c3aed;
  color: white;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.quiz-actions button:hover {
  background: #9333ea;
  transform: translateY(-1px);
}

.quiz-score {
  color: #cbd5e1;
  font-size: 0.95rem;
}

.quiz-progress {
  color: #cbd5e1;
  font-weight: 600;
}

.quiz-start {
  display: grid;
  gap: 10px;
  align-items: center;
}

.quiz-start button {
  width: fit-content;
  padding: 12px 18px;
  border: none;
  border-radius: 14px;
  background: #7c3aed;
  color: white;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.quiz-start button:hover {
  background: #9333ea;
  transform: translateY(-1px);
}

.quiz-start p {
  margin: 0;
  color: #cbd5e1;
}

@media (max-width: 680px) {
  .page-header {
    padding: 24px 16px 16px;
  }

  .page-header__inner {
    gap: 16px;
  }

  .page-header__inner > div:first-child > p:last-child {
    margin-top: 10px;
    line-height: 1.55;
  }

  .eyebrow {
    font-size: 0.75rem;
    margin-bottom: 8px;
  }

  h1 {
    font-size: clamp(1.9rem, 9vw, 2.5rem);
  }

  .search-wrapper {
    max-width: none;
  }

  input[type="search"] {
    min-height: 48px;
    padding: 12px 14px;
    font-size: 16px;
  }

  .view-toggle {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin: 16px 0 0;
  }

  .view-toggle__button {
    min-width: 0;
    min-height: 46px;
    padding: 10px 8px;
    font-size: 0.9rem;
  }

  .main-content {
    padding: 16px;
  }

  .cards-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .card {
    min-height: 0;
    padding: 18px;
    gap: 10px;
    border-radius: 18px;
  }

  .card:hover,
  .view-toggle__button:hover,
  .quiz-mode__button:hover,
  .quiz-option:hover:not(:disabled),
  .quiz-actions button:hover,
  .quiz-start button:hover,
  .learn-actions button:hover:not(:disabled),
  .learn-start:hover {
    transform: none;
  }

  .card h2 {
    font-size: 1.15rem;
    overflow-wrap: anywhere;
  }

  .card p,
  .quiz-start p {
    line-height: 1.55;
  }

  .card-pronunciation {
    font-size: 0.82rem;
    overflow-wrap: anywhere;
  }

  .card-listen,
  .secondary-button {
    min-height: 44px;
  }

  .learn-panel,
  .quiz-panel {
    margin-top: 16px;
    padding: 18px 14px;
    border-radius: 20px;
  }

  .learn-header,
  .quiz-header {
    gap: 9px;
  }

  .learn-header h2,
  .quiz-header h2 {
    font-size: 1.5rem;
  }

  .learn-header > p:last-child,
  .quiz-header > p:last-child {
    line-height: 1.55;
  }

  .study-settings,
  .typing-direction,
  .typing-answer,
  .quiz-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    align-items: stretch;
    gap: 8px;
  }

  .study-settings,
  .typing-direction {
    margin-top: 16px;
  }

  .study-settings select,
  .typing-direction select {
    width: 100%;
    min-height: 46px;
    font-size: 16px;
  }

  .study-due-label {
    padding: 6px 0;
    line-height: 1.4;
  }

  .study-due-label input {
    flex: 0 0 auto;
    width: 20px;
    height: 20px;
  }

  .learn-card {
    width: 100%;
    min-height: 0;
    margin-top: 16px;
    padding: 22px 16px;
    gap: 15px;
    border-radius: 18px;
  }

  .learn-card h3 {
    font-size: clamp(1.65rem, 8vw, 2.25rem);
    overflow-wrap: anywhere;
  }

  .learn-pronunciation,
  .learn-translation,
  .learn-example {
    overflow-wrap: anywhere;
    line-height: 1.55;
  }

  .speaking-actions {
    width: 100%;
  }

  .speaking-actions button {
    flex: 1 1 145px;
  }

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

  .learn-actions button {
    min-height: 46px;
    padding: 10px 8px;
  }

  #learnReveal {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  .review-actions {
    width: 100%;
    gap: 8px;
  }

  .review-actions span {
    flex: 1 0 100%;
  }

  .review-actions button {
    flex: 1 1 95px;
    min-height: 44px;
    padding: 9px 8px;
  }

  .quiz-mode {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    margin-top: 16px;
  }

  .quiz-mode__button {
    min-height: 46px;
    padding: 10px 12px;
    text-align: left;
    border-radius: 14px;
  }

  .practice-settings {
    margin-bottom: 14px;
  }

  .typing-answer input {
    width: 100%;
    min-height: 48px;
    font-size: 16px;
  }

  .typing-answer button,
  .quiz-actions button,
  .quiz-start button,
  .learn-start {
    width: 100%;
    min-height: 46px;
  }

  .quiz-card {
    margin-top: 14px;
    gap: 14px;
    padding: 18px 14px;
    border-radius: 18px;
  }

  .quiz-question {
    display: grid;
    gap: 6px;
    align-items: start;
  }

  .quiz-question strong {
    font-size: 1.25rem;
    line-height: 1.35;
    overflow-wrap: anywhere;
  }

  .quiz-options {
    grid-template-columns: minmax(0, 1fr);
    gap: 9px;
  }

  .quiz-option {
    min-height: 48px;
    padding: 12px 14px;
    line-height: 1.4;
    overflow-wrap: anywhere;
    text-align: left;
  }

  .quiz-progress,
  .quiz-score,
  .quiz-feedback {
    line-height: 1.5;
    overflow-wrap: anywhere;
  }

  .quiz-feedback {
    min-height: 0;
  }

  .main-content button,
  .view-toggle__button,
  .quiz-mode__button {
    touch-action: manipulation;
  }

  .main-content button:focus-visible,
  .view-toggle__button:focus-visible,
  .quiz-mode__button:focus-visible,
  input:focus-visible,
  select:focus-visible {
    outline: 3px solid #a5b4fc;
    outline-offset: 2px;
  }
}

@media (max-width: 360px) {
  .page-header {
    padding-inline: 12px;
  }

  .main-content {
    padding: 12px;
  }

  .view-toggle__button {
    padding-inline: 5px;
    font-size: 0.82rem;
  }

  .learn-panel,
  .quiz-panel {
    padding-inline: 10px;
  }

  .learn-card,
  .quiz-card {
    padding-inline: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}