/* ═══════════════════════════════════════════════════════════
   BASE.CSS — Design tokens, reset, typography
   Voice Control Research Platform
═══════════════════════════════════════════════════════════ */

:root {
  /* Colour palette — light, minimal */
  --colour-bg:           #f8f9fb;
  --colour-surface:      #ffffff;
  --colour-surface-2:    #f1f3f7;
  --colour-border:       #e2e6ed;
  --colour-border-focus: #4f6ef7;

  --colour-text-primary:   #111827;
  --colour-text-secondary: #6b7280;
  --colour-text-muted:     #9ca3af;

  --colour-accent:         #4f6ef7;
  --colour-accent-hover:   #3b57e8;
  --colour-accent-subtle:  #eef0fe;

  --colour-success:        #16a34a;
  --colour-success-subtle: #f0fdf4;
  --colour-warning:        #d97706;
  --colour-warning-subtle: #fffbeb;
  --colour-danger:         #dc2626;
  --colour-danger-subtle:  #fef2f2;

  /* Recording indicator */
  --colour-recording:      #ef4444;

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Typography */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;

  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --header-height: 56px;
  --panel-width:   320px;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

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

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-semibold);
  line-height: 1.3;
  color: var(--colour-text-primary);
}

p { color: var(--colour-text-secondary); }

a { color: var(--colour-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* ── Shared Components ── */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  font-family: var(--font-sans);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.5;
}

.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--colour-accent);
  color: #fff;
  border-color: var(--colour-accent);
}
.btn-primary:hover:not(:disabled) { background: var(--colour-accent-hover); border-color: var(--colour-accent-hover); }

.btn-secondary {
  background: var(--colour-surface);
  color: var(--colour-text-primary);
  border-color: var(--colour-border);
}
.btn-secondary:hover:not(:disabled) { background: var(--colour-surface-2); }

.btn-ghost {
  background: transparent;
  color: var(--colour-text-secondary);
  border-color: transparent;
}
.btn-ghost:hover:not(:disabled) { background: var(--colour-surface-2); color: var(--colour-text-primary); }

.btn-danger {
  background: var(--colour-danger-subtle);
  color: var(--colour-danger);
  border-color: var(--colour-danger);
}
.btn-danger:hover:not(:disabled) { background: var(--colour-danger); color: #fff; }

.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--text-base); }
.btn-icon { padding: var(--space-2); width: 36px; height: 36px; justify-content: center; }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
}
.badge-blue   { background: var(--colour-accent-subtle); color: var(--colour-accent); }
.badge-green  { background: var(--colour-success-subtle); color: var(--colour-success); }
.badge-amber  { background: var(--colour-warning-subtle); color: var(--colour-warning); }
.badge-red    { background: var(--colour-danger-subtle); color: var(--colour-danger); }
.badge-grey   { background: var(--colour-surface-2); color: var(--colour-text-secondary); }

/* Form elements */
.form-group { display: flex; flex-direction: column; gap: var(--space-1); }

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--colour-text-primary);
}
.form-hint {
  font-size: var(--text-xs);
  color: var(--colour-text-muted);
  margin-top: 2px;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-2) var(--space-8) var(--space-2) var(--space-3);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  color: var(--colour-text-primary);
  background: var(--colour-surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E") no-repeat right 0.75rem center;
  background-size: 1rem;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  cursor: pointer;
}
.form-select:focus {
  border-color: var(--colour-border-focus);
  box-shadow: 0 0 0 3px rgba(79,110,247,0.12);
}

/* Divider */
.divider {
  border: none;
  border-top: 1px solid var(--colour-border);
  margin: var(--space-4) 0;
}

/* Card */
.card {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

/* Chip toggle */
.chip-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--colour-border);
  background: var(--colour-surface);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}
.chip-toggle.active {
  background: var(--colour-accent-subtle);
  border-color: var(--colour-accent);
  color: var(--colour-accent);
}

/* Toast */
#toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}
.toast {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--colour-text-primary);
  color: #fff;
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  animation: toast-in 200ms ease forwards;
  pointer-events: auto;
  max-width: 320px;
}
.toast.success { background: var(--colour-success); }
.toast.warning { background: var(--colour-warning); }
.toast.error   { background: var(--colour-danger); }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--colour-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: #c0c7d2; }

/* Utility */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-muted { color: var(--colour-text-muted); }
.text-secondary { color: var(--colour-text-secondary); }