:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1f2937;
  --bg-warning: #1c1307;
  --bg-success: #0d2f1e;
  --border-primary: #30363d;
  --border-focus: #58a6ff;
  --border-success: #238636;
  --border-warning: #9e6a03;
  --text-primary: #e6edf3;
  --text-secondary: #c9d1d9;
  --text-muted: #8b949e;
  --text-disabled: #484f58;
  --accent-blue: #58a6ff;
  --accent-blue-hover: #388bfd;
  --accent-green: #238636;
  --accent-green-hover: #2ea043;
  --accent-green-light: #3fb950;
  --accent-warning: #d29922;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius-pill: 20px;
  --shadow-focus: 0 0 0 3px rgba(88, 166, 255, 0.15);
  --shadow-warning: 0 0 0 3px rgba(210, 153, 34, 0.2);
}

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

/* ── Screen-reader only utility ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Custom scrollbars (affects select dropdowns, textarea, etc.) ── */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #0d1117;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: #30363d;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #484f58;
}

body {
  font-family: var(--font-system);
  background: var(--bg-primary);
  color: var(--text-secondary);
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
  min-height: 100vh;
  position: relative;
}

/* ── Skip-to-content link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent-blue);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  z-index: 100;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* ── Focus visible for keyboard navigation ── */
*:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

main.container {
  width: 100%;
  max-width: 720px;
  overflow: visible;
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
}

header h1 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

header h1 span {
  color: var(--accent-blue);
}

header p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

header h2 {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 400;
  margin-top: 0.4rem;
}

.editor-area {
  position: relative;
  display: flex;
  justify-content: center;
  width: 100%;
}

/*  Visible resize grip indicator ── */

.resize-grip {
  position: absolute;
  bottom: 10px;
  right: 10px;
  width: 20px;
  height: 20px;
  z-index: 2;
  cursor: nwse-resize;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20'%3E%3Ccircle cx='16' cy='16' r='1.5' fill='%23238636'/%3E%3Ccircle cx='10.5' cy='16' r='1.5' fill='%23238636'/%3E%3Ccircle cx='16' cy='10.5' r='1.5' fill='%23238636'/%3E%3Ccircle cx='5' cy='16' r='1.5' fill='%23238636'/%3E%3Ccircle cx='10.5' cy='10.5' r='1.5' fill='%23238636'/%3E%3Ccircle cx='16' cy='5' r='1.5' fill='%23238636'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.editor-area:hover .resize-grip {
  opacity: 1;
}

.resize-grip:active {
  opacity: 1;
}

textarea {
  width: 100%;
  height: 360px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: none;
  outline: none;
}

/* Hide native resize handle — custom grip handles the visual cue */
textarea::-webkit-resizer {
  display: none;
}

textarea:focus {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-focus);
}

textarea::placeholder {
  color: var(--text-disabled);
}

.controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.lang-badge {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  transition: all 0.2s;
}

.lang-badge.detected {
  background: var(--bg-success);
  border-color: var(--accent-green);
  color: var(--accent-green-light);
}

.filename-input {
  flex: 1;
  min-width: 160px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
}

.filename-input:focus {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-focus);
}

.download-btn {
  background: var(--accent-green);
  color: #fff;
  border: 1px solid var(--accent-green-hover);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.download-btn:hover {
  background: var(--accent-green-hover);
}

.download-btn:active {
  background: var(--accent-green);
}

.download-btn:disabled {
  background: #21262d;
  border-color: var(--border-primary);
  color: var(--text-disabled);
  cursor: not-allowed;
}

.download-btn.loading {
  position: relative;
  pointer-events: none;
}

.download-btn.loading::after {
  content: '';
  position: absolute;
  right: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.5s linear infinite;
}

@keyframes spin {
  to { transform: translateY(-50%) rotate(360deg); }
}

.hint {
  text-align: center;
  color: var(--text-disabled);
  font-size: 0.75rem;
  margin-top: 1rem;
}

/* ── Unknown-format panel ── */

.unknown-format-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--bg-warning);
  border: 1px solid var(--border-warning);
  border-radius: var(--radius-pill);
  transition: all 0.3s;
}

.unknown-format-panel.hidden {
  display: none;
}

.unknown-msg {
  color: var(--accent-warning);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.quick-picks {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.quick-pick-btn {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}

.quick-pick-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.quick-pick-btn:active {
  background: var(--bg-success);
  border-color: var(--accent-green);
  color: var(--accent-green-light);
}

.format-select {
  width: 100%;
  background: var(--bg-secondary) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b949e' d='M6 8.5L1 3.5l1-1 4 4 4-4 1 1z'/%3E%3C/svg%3E") no-repeat right 0.75rem center;
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  color-scheme: dark;
}

.format-select option {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.4rem 0.5rem;
}

.format-select option:checked {
  background: var(--accent-green);
  color: #fff;
}

.format-select option:hover,
.format-select option:focus {
  background: var(--accent-green-hover);
  color: #fff;
}

.format-select optgroup {
  background: var(--bg-primary);
  color: var(--text-muted);
  font-style: normal;
  font-weight: 600;
}

.format-select:focus {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-focus);
}

.ext-input {
  width: 100%;
  margin-top: 0.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-pill);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}

.ext-input.hidden {
  display: none;
}

.ext-input:focus {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-focus);
}

.ext-input.has-value {
  border-color: var(--accent-green);
}

/* ── Aggressive shake animation ── */

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
  20%, 40%, 60%, 80% { transform: translateX(8px); }
}

@keyframes shakeHard {
  0%, 100% { transform: translateX(0); }
  10% { transform: translateX(-12px) rotate(-1deg); }
  20% { transform: translateX(12px) rotate(1deg); }
  30% { transform: translateX(-10px) rotate(-0.5deg); }
  40% { transform: translateX(10px) rotate(0.5deg); }
  50% { transform: translateX(-8px); }
  60% { transform: translateX(8px); }
  70% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
  90% { transform: translateX(-3px); }
}

.shake {
  animation: shake 0.6s cubic-bezier(.36,.07,.19,.97) both;
}

.shake-hard {
  animation: shakeHard 0.8s cubic-bezier(.36,.07,.19,.97) both;
}

/* ── Extension highlight in filename input ── */

.filename-input.ext-highlight {
  border-color: var(--accent-warning);
  box-shadow: var(--shadow-warning);
}

/* ── Mobile responsive ── */

@media (max-width: 600px) {
  .resize-grip {
    display: none;
  }

  body {
    padding: 1rem 0.75rem;
  }

  header h1 {
    font-size: 1.25rem;
  }

  header h2 {
    font-size: 0.8rem;
  }

  header p {
    font-size: 0.8rem;
  }

  textarea {
    height: 260px;
    font-size: 0.8rem;
    padding: 0.75rem;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .lang-badge {
    align-self: center;
  }

  .filename-input {
    min-width: unset;
    width: 100%;
  }

  .download-btn,
  .share-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    text-align: center;
  }

  .unknown-format-panel {
    padding: 0.75rem;
  }

  .unknown-msg {
    font-size: 0.8rem;
  }

  .quick-picks {
    gap: 0.4rem;
  }

  .quick-pick-btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.8rem;
  }
}

/* ── Share button ── */

.share-btn {
  display: none;
  background: var(--accent-blue-hover);
  color: #fff;
  border: 1px solid var(--accent-blue);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.share-btn:hover {
  background: var(--accent-blue);
}

.share-btn:active {
  background: var(--accent-blue-hover);
}

.share-btn:disabled {
  background: #21262d;
  border-color: var(--border-primary);
  color: var(--text-disabled);
  cursor: not-allowed;
}

@media (max-width: 600px) {
  .share-btn {
    display: inline-block; /* visible on mobile */
  }

  .share-btn.unsupported {
    display: none; /* hide only if browser truly can't share */
  }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}