:root {
  --accent: #b45309;
  --accent-light: #d97706;
  --accent-bg: #fffbeb;
  --green: #15803d;
  --green-bg: #f0fdf4;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --blue: #1d4ed8;
  --blue-bg: #eff6ff;
  --bg: #fafaf9;
  --card: #ffffff;
  --text: #1c1917;
  --text-mid: #57534e;
  --text-light: #a8a29e;
  --border: #e7e5e4;
  --border-dark: #d6d3d1;
  --shadow: 0 1px 2px rgba(0,0,0,.04);
  --radius: 6px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.app-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.app-header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.15rem;
}

.header-stats {
  display: flex;
  gap: 0.5rem;
  font-size: 0.8rem;
}

.stat-badge {
  color: var(--text-mid);
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.main-nav {
  display: flex;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 1rem;
  overflow-x: auto;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-btn {
  padding: 0.75rem 1rem;
  border: none;
  background: none;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.15s;
  white-space: nowrap;
}

.nav-btn:hover { color: var(--text); }
.nav-btn.active { color: var(--text); border-bottom-color: var(--text); }

.app-main { max-width: 880px; margin: 0 auto; padding: 1.5rem; }

.tab-content { display: none; }
.tab-content.active { display: block; }

.filters {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.search-input {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  background: var(--card);
}

.search-input:focus { border-color: var(--border-dark); }

.level-filters { display: flex; gap: 0.35rem; flex-wrap: wrap; }

.level-btn {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-mid);
  transition: all 0.15s;
}

.level-btn:hover { border-color: var(--border-dark); color: var(--text); }
.level-btn.active {
  background: var(--text);
  color: var(--card);
  border-color: var(--text);
}

.letter-filters { display: flex; gap: 2px; flex-wrap: wrap; }

.letter-btn {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--card);
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s;
}

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

.word-count {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.word-list { display: flex; flex-direction: column; gap: 1px; }

.word-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  transition: background 0.1s;
}

.word-card:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.word-card:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.word-card + .word-card { border-top: none; }
.word-card:hover { background: #fafaf9; }
.word-card.learned { border-left: 3px solid var(--green); }

.word-main { flex: 1; min-width: 0; }

.word-en {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.word-pos {
  font-size: 0.72rem;
  color: var(--text-light);
  margin-left: 0.35rem;
}

.word-tr {
  font-size: 0.88rem;
  color: var(--text-mid);
  margin-top: 0.15rem;
}

.word-example {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 0.2rem;
  font-style: italic;
  line-height: 1.35;
}

.word-level {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  white-space: nowrap;
}

/* Liste kartlarında seviye rozeti — yumuşak hap şekli */
.word-level-pill {
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  font-size: 0.6rem;
  line-height: 1;
}

.level-A1 { background: #ecfdf5; color: #065f46; }
.level-A2 { background: #eff6ff; color: #1e40af; }
.level-B1 { background: #fffbeb; color: #92400e; }
.level-B2 { background: #fdf2f8; color: #9d174d; }

/* Sağ sütun: seviye + dinle / çeviri / öğrendim — tek hizada minimal araç çubuğu */
.word-card-toolbar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

.word-toolbar-btns {
  --wt-corner: 4px;
  display: inline-flex;
  align-items: stretch;
  gap: 3px;
  padding: 3px 3px 3px 5px;
  border-radius: var(--wt-corner);
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--border);
}

/* Dörtlü şerit: seviye | dinle | TR | öğrendim */
.wt-level {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  min-height: 30px;
  padding: 0 0.5rem 0 0.35rem;
  margin-right: 1px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  border-radius: var(--wt-corner);
}

/* Toolbar içindeki seviye, hap şeklini bırakıp dış kutu ile aynı keskin köşe */
.word-toolbar-btns .wt-level.word-level-pill {
  border-radius: var(--wt-corner);
}

.wt-btn {
  box-sizing: border-box;
  min-width: 30px;
  height: 30px;
  margin: 0;
  padding: 0;
  border: none;
  border-radius: var(--wt-corner);
  background: var(--card);
  color: var(--text-mid);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
}

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

.wt-btn:active {
  transform: scale(0.96);
}

.wt-btn:focus-visible {
  outline: 2px solid var(--accent-light);
  outline-offset: 1px;
}

.wt-btn .wt-ico {
  width: 13px;
  height: 13px;
  display: block;
  flex-shrink: 0;
}

.wt-play {
  color: var(--text);
}

.wt-tr {
  min-width: 2rem;
  padding: 0 0.3rem;
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-mid);
}

.wt-learn.is-learned {
  background: var(--green-bg);
  color: var(--green);
}

.wt-learn.is-learned:hover {
  background: #dcfce7;
  color: #14532d;
}

/* Eski sınıf — başka yerde kullanılırsa */
.word-actions { display: flex; gap: 0.25rem; align-items: center; }

.btn-icon {
  width: 30px;
  height: 30px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: none;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
}

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

.pagination {
  display: flex;
  justify-content: center;
  gap: 2px;
  margin-top: 1.25rem;
}

.page-btn {
  min-width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--card);
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-mid);
  transition: all 0.1s;
}

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

.hidden { display: none !important; }

@media (max-width: 640px) {
  .app-header { padding: 1rem; }
  .app-header h1 { font-size: 1rem; }
  .app-main { padding: 0.75rem; }
  .word-card { flex-direction: column; align-items: stretch; gap: 0.5rem; }
  .word-card-toolbar {
    width: 100%;
    justify-content: center;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
  }
  .word-toolbar-btns {
    width: 100%;
    max-width: 20rem;
    justify-content: space-between;
    padding-left: 6px;
  }
  .wt-level {
    border-right: 1px solid var(--border);
    padding-right: 0.65rem;
  }
  .nav-btn { padding: 0.6rem 0.7rem; font-size: 0.8rem; }
}

@media (max-width: 480px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .header-stats {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  .stat-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
  }

  .search-input {
    padding: 0.5rem 0.7rem;
    font-size: 0.85rem;
  }

  .level-filters {
    justify-content: center;
  }

  .level-btn {
    padding: 0.25rem 0.55rem;
    font-size: 0.7rem;
  }

  .letter-filters {
    justify-content: center;
  }

  .letter-btn {
    width: 24px;
    height: 24px;
    font-size: 0.65rem;
  }

  .word-en {
    font-size: 0.9rem;
  }

  .word-pos {
    font-size: 0.65rem;
  }

  .word-tr {
    font-size: 0.8rem;
  }

  .word-example {
    font-size: 0.7rem;
  }

  .pagination {
    gap: 2px;
  }

  .page-btn {
    min-width: 28px;
    height: 28px;
    font-size: 0.75rem;
  }
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(250, 250, 249, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--text-mid);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.shortcuts-hint {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  font-size: 0.7rem;
  color: var(--text-light);
  display: flex;
  gap: 0.75rem;
  z-index: 50;
  box-shadow: var(--shadow);
}

.shortcuts-hint kbd {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.3rem;
  font-family: inherit;
  font-size: 0.65rem;
}

@media (max-width: 640px) {
  .shortcuts-hint { display: none; }
}

#toastContainer {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  animation: slideIn 0.3s ease;
  max-width: 280px;
}

.toast.success { border-left: 3px solid var(--green); }
.toast.error { border-left: 3px solid var(--red); }
.toast.info { border-left: 3px solid var(--blue); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.loading-inline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2rem;
  color: var(--text-mid);
  font-size: 0.9rem;
}

.loading-spinner-sm {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}