:root {
  --bg: #f7f3ec;
  --bg-card: #ffffff;
  --ink: #1f2a2e;
  --ink-soft: #51636a;
  --line: #e6dfd1;
  --accent: #d35b3a;
  --accent-soft: #f4d9cd;
  --teal: #1f4e4a;
  --teal-soft: #d9ebe6;
  --ok: #2f8a66;
  --err: #c6502f;
  --shadow: 0 1px 2px rgba(31,42,46,.05), 0 12px 32px -12px rgba(31,42,46,.18);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 32px;
  max-width: 920px;
  margin: 0 auto;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--teal);
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  background: var(--teal);
  color: #f7f3ec;
  border-radius: 10px;
  font-size: 16px;
}
.brand-text {
  font-family: 'Fraunces', serif;
  font-size: 18px;
  letter-spacing: .3px;
}
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
}
.tab {
  border: 0;
  background: transparent;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 500;
  transition: all .2s ease;
}
.tab:hover { color: var(--ink); }
.tab.active {
  background: var(--teal);
  color: #fff;
}
.streak {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--accent-soft);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* Main */
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}
.view { display: none; }
.view.active { display: block; animation: fade .35s ease; }
@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.eyebrow {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 14px;
  font-weight: 600;
}

/* Word Card (daily & quiz) */
.word-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 36px 32px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.daily-card .word {
  font-family: 'Fraunces', serif;
  font-size: 54px;
  font-weight: 600;
  margin: 0 0 4px;
  letter-spacing: -.5px;
  color: var(--ink);
}
.daily-card .phonetic {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 20px;
}
.daily-card .pos {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  background: var(--teal-soft);
  color: var(--teal);
  border-radius: 999px;
  font-weight: 600;
  margin-right: 8px;
}
.daily-card .meaning {
  font-size: 18px;
  margin: 4px 0 22px;
}
.daily-card .example-label {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 18px 0 6px;
}
.daily-card .example {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--ink);
  font-style: italic;
}
.daily-card .example-zh {
  color: var(--ink-soft);
  font-style: normal;
  font-size: 14px;
  margin-top: 4px;
}
.word-loading { color: var(--ink-soft); padding: 8px 0; }

/* Actions */
.actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.btn {
  padding: 12px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all .18s ease;
}
.btn.primary {
  background: var(--accent);
  color: #fff;
}
.btn.primary:hover { background: #b9492c; }
.btn.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn.ghost:hover { background: var(--bg-card); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Flashcard */
.flashcard {
  perspective: 1200px;
  cursor: pointer;
  min-height: 280px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 280px;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.2,.7,.2,1);
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--shadow);
}
.flashcard-back {
  transform: rotateY(180deg);
  background: var(--teal);
  color: #f7f3ec;
  border-color: var(--teal);
}
.flash-hint {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 14px;
}
.flash-word {
  font-family: 'Fraunces', serif;
  font-size: 48px;
  margin: 0;
  font-weight: 600;
}
.flash-phonetic {
  font-style: italic;
  color: var(--ink-soft);
  margin: 8px 0 0;
}
.flash-meaning {
  font-size: 22px;
  margin: 0 0 16px;
  font-weight: 500;
}
.flash-example {
  margin: 0;
  font-style: italic;
  opacity: .85;
  font-size: 15px;
}

/* Quiz */
.quiz-word {
  font-family: 'Fraunces', serif;
  font-size: 40px;
  margin: 0 0 24px;
  font-weight: 600;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quiz-option {
  text-align: left;
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  cursor: pointer;
  transition: all .15s ease;
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--teal);
  background: var(--teal-soft);
}
.quiz-option.correct {
  background: #e3f1ea;
  border-color: var(--ok);
  color: var(--ok);
}
.quiz-option.wrong {
  background: #f7e2d9;
  border-color: var(--err);
  color: var(--err);
}
.quiz-option:disabled { cursor: default; }
.quiz-feedback {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
  min-height: 20px;
}
.quiz-score {
  margin-top: 18px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
}
.quiz-score strong { color: var(--accent); font-size: 18px; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 13px;
  color: var(--ink-soft);
}

@media (max-width: 640px) {
  .site-header { flex-wrap: wrap; padding: 18px 20px; }
  .tabs { order: 3; width: 100%; justify-content: center; }
  .daily-card .word, .flash-word { font-size: 42px; }
  .word-card, .flashcard-face { padding: 28px 22px; }
  main { padding: 16px 16px 60px; }
}