/* ============================================
   CrafterTools Base64 Tool — premium UI
   Matches existing header/footer styles.
   ============================================ */

/* --- CSS Variables (dark/light) --- */
:root {
  --bg: #0b0d14;
  --surface: #14171f;
  --surface-2: #1c1f2a;
  --border: #2a2f3d;
  --text: #eef1f8;
  --text-muted: #9aa3b8;
  --primary: #6c5ce7;
  --primary-hover: #7d6ff0;
  --primary-glow: rgba(108, 92, 231, 0.25);
  --danger: #ff6b6b;
  --success: #20c997;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  --transition: 0.2s cubic-bezier(0.2, 0, 0, 1);
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

/* Light mode overrides */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --surface-2: #f0f2f8;
    --border: #dde1ea;
    --text: #12141c;
    --text-muted: #5e657a;
    --primary: #5a4ad1;
    --primary-hover: #4b3cb8;
    --primary-glow: rgba(90, 74, 209, 0.15);
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  }
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* --- Wrapper (tool section only) --- */
.crafter-tool-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  width: 100%;
}

/* --- Card --- */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  transition: background var(--transition), border-color var(--transition);
}

/* --- Header --- */
.tool-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.tool-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.privacy-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--surface-2);
  padding: 0.45rem 0.9rem;
  border-radius: 40px;
  border: 1px solid var(--border);
  max-width: 420px;
  line-height: 1.3;
}

.privacy-badge svg {
  flex-shrink: 0;
  color: var(--primary);
}

/* --- IO Grid --- */
.io-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.io-panel {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.panel-actions {
  display: flex;
  gap: 0.3rem;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.icon-btn:hover,
.icon-btn:focus-visible {
  background: var(--surface-2);
  color: var(--text);
  outline: none;
}

/* --- Textareas --- */
.io-textarea {
  width: 100%;
  min-height: 200px;
  resize: vertical;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  color: var(--text);
  font-family: 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.9rem;
  line-height: 1.55;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.io-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.io-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

/* --- Drop Zone --- */
.file-drop-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  text-align: center;
}

.file-drop-zone:hover,
.file-drop-zone:focus-visible,
.file-drop-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-glow);
  color: var(--text);
  outline: none;
}

.file-drop-zone u {
  color: var(--primary);
  text-decoration: underline;
  cursor: pointer;
}

/* --- Output actions --- */
.output-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: 40px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-outline:hover {
  background: var(--surface-2);
  border-color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}

/* --- Action bar --- */
.action-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.action-group {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* --- Error message --- */
.error-message {
  min-height: 1.6rem;
  font-size: 0.85rem;
  color: var(--danger);
  padding: 0.25rem 0;
  transition: opacity var(--transition);
  opacity: 0;
}

.error-message.visible {
  opacity: 1;
}

/* --- Live toggle --- */
.live-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.switch-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
}

.switch-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--primary);
  cursor: pointer;
}

/* --- Responsive --- */
@media (max-width: 720px) {
  .crafter-tool-wrapper {
    padding: 1rem 0.75rem 2rem;
  }

  .tool-card {
    padding: 1.25rem;
  }

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

  .tool-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .privacy-badge {
    max-width: 100%;
  }

  .io-textarea {
    min-height: 160px;
  }

  .action-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .action-group {
    justify-content: center;
  }

  .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .tool-title {
    font-size: 1.3rem;
  }

  .btn {
    font-size: 0.8rem;
    padding: 0.55rem 0.9rem;
  }
}

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