/* ============================================
   TaskFlow Components — Part 1: Buttons & Inputs
   ============================================ */

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  min-height: 40px;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-glow);
}
.btn-primary:hover {
  box-shadow: 0 6px 25px var(--accent-glow);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
}
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--accent-light); color: var(--accent); }
.btn-danger { background: var(--error); color: #fff; }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: var(--radius-md); }
.btn-sm { padding: 6px 14px; font-size: var(--text-xs); min-height: 32px; }
.btn-lg { padding: 14px 28px; font-size: var(--text-base); min-height: 48px; }

.btn-loading { color: transparent !important; pointer-events: none; }
.btn-loading::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
.btn-google {
  background: #fff;
  color: #1a1a2e;
  border: 1px solid #ddd;
  font-weight: 500;
}
.btn-google:hover { background: #f5f5f5; box-shadow: var(--shadow-md); }
.btn-google svg { width: 20px; height: 20px; }

/* ---- Inputs ---- */
.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}
.input-wrapper { position: relative; display: flex; align-items: center; }
.input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-base);
  transition: all var(--transition-fast);
  outline: none;
}
.input:hover { border-color: var(--border-accent); }
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.input::placeholder { color: var(--text-tertiary); }
.input--error { border-color: var(--error) !important; box-shadow: 0 0 0 3px var(--error-bg) !important; }
.input--success { border-color: var(--success) !important; }

.input-icon {
  position: absolute; right: 12px;
  color: var(--text-tertiary); cursor: pointer;
  transition: color var(--transition-fast);
  z-index: 2;
  flex-shrink: 0;
  display: flex; align-items: center;
}
.input-icon:hover { color: var(--text-primary); }
/* Ensure input text doesn't go under the eye icon */
.input-wrapper .input { padding-right: 44px; }

.input-error-msg {
  font-size: var(--text-xs); color: var(--error);
  display: none; align-items: center; gap: 4px;
}
.input-error-msg.visible { display: flex; }

.input-success-icon {
  position: absolute; right: 12px; color: var(--success);
  opacity: 0; transform: scale(0);
  transition: all var(--transition-spring);
}
.input-success-icon.visible { opacity: 1; transform: scale(1); }

.textarea {
  width: 100%; padding: 12px 16px;
  background: var(--bg-input);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-base);
  resize: vertical; min-height: 80px;
  outline: none; font-family: var(--font-primary);
  transition: all var(--transition-fast);
}
.textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }

.select {
  appearance: none; width: 100%;
  padding: 12px 40px 12px 16px;
  background: var(--bg-input) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 14px center;
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer; outline: none;
  transition: all var(--transition-fast);
}
.select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }

/* ---- Custom Checkbox ---- */
.checkbox-wrapper {
  display: flex; align-items: center; gap: var(--space-sm);
  cursor: pointer; user-select: none;
}
.checkbox-wrapper input[type="checkbox"] { display: none; }
.checkbox-custom {
  width: 20px; height: 20px;
  border: 2px solid var(--border-primary);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition-fast); flex-shrink: 0;
}
.checkbox-wrapper input:checked + .checkbox-custom {
  background: var(--accent-gradient); border-color: transparent;
}
.checkbox-custom svg {
  width: 14px; height: 14px; color: #fff;
  opacity: 0; transform: scale(0);
  transition: all var(--transition-spring);
}
.checkbox-wrapper input:checked + .checkbox-custom svg { opacity: 1; transform: scale(1); }

/* ---- Toggle Switch ---- */
.toggle { position: relative; width: 48px; height: 26px; cursor: pointer; }
.toggle input { display: none; }
.toggle-track {
  position: absolute; inset: 0;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}
.toggle input:checked + .toggle-track { background: var(--accent); }
.toggle-thumb {
  position: absolute; top: 3px; left: 3px;
  width: 20px; height: 20px;
  background: #fff; border-radius: 50%;
  transition: transform var(--transition-spring);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.toggle input:checked ~ .toggle-thumb { transform: translateX(22px); }

/* ---- Password Strength ---- */
.password-strength { display: flex; gap: 4px; margin-top: 6px; }
.strength-segment {
  flex: 1; height: 4px; border-radius: 2px;
  background: var(--bg-tertiary);
  transition: background var(--transition-fast);
}
.strength-segment.active[data-level="1"] { background: #ef4444; }
.strength-segment.active[data-level="2"] { background: #f97316; }
.strength-segment.active[data-level="3"] { background: #eab308; }
.strength-segment.active[data-level="4"] { background: #22c55e; }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: var(--space-lg);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-spring);
  animation: springIn 0.3s ease-out;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  border-bottom: 1px solid var(--border-secondary);
  position: sticky;
  top: 0;
  background: var(--bg-card);
  z-index: 10;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.modal-header h3 { margin: 0; font-size: var(--text-lg); }
.modal-body { padding: var(--space-lg); }
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--border-secondary);
}

/* ---- Skeleton ---- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---- Chip / Badge ---- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
}
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-tertiary);
}
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: capitalize;
}
.status-badge--todo { background: var(--info-bg, rgba(56,189,248,0.1)); color: var(--info); }
.status-badge--in_progress { background: var(--warning-bg, rgba(251,191,36,0.1)); color: var(--warning); }
.status-badge--review { background: var(--accent-light); color: var(--accent); }
.status-badge--done { background: var(--success-bg, rgba(52,211,153,0.1)); color: var(--success); }

/* ---- Priority Dot ---- */
.priority-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.priority-dot--low { background: var(--priority-low, #22c55e); }
.priority-dot--medium { background: var(--priority-medium, #eab308); }
.priority-dot--high { background: var(--priority-high, #f97316); }
.priority-dot--critical { background: var(--priority-critical, #ef4444); }

/* ---- Dropdown ---- */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs) 0;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(4px); }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.dropdown-item:hover { background: var(--bg-hover); }
.dropdown-divider { height: 1px; background: var(--border-secondary); margin: var(--space-xs) 0; }

/* ---- Context Menu ---- */
.context-menu {
  position: fixed;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-xs) 0;
  z-index: 9999;
  animation: fadeSlideIn 0.15s ease-out;
}
.context-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 14px;
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.context-menu-item:hover { background: var(--bg-hover); }
.context-menu-item--danger { color: var(--error); }

/* ---- Tooltip ---- */
[data-tooltip] { position: relative; }
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 4px 10px;
  background: var(--bg-surface, #1a1a2e);
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
  z-index: 999;
}
[data-tooltip]:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Select ---- */
.select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 18px;
}
.select:focus { border-color: var(--accent); outline: none; }

/* ---- Textarea ---- */
.textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: inherit;
  resize: vertical;
  min-height: 80px;
  transition: border-color var(--transition-fast);
}
.textarea:focus { border-color: var(--accent); outline: none; }

/* ---- Pill Group ---- */
.pill-group {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}
.pill-option {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-tertiary);
}
.pill-option:hover { color: var(--text-primary); }
.pill-option.active { background: var(--accent); color: #fff; }

/* ---- Utility ---- */
.w-full { width: 100%; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.text-xs { font-size: var(--text-xs); }
.text-muted { color: var(--text-tertiary); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hover-lift { transition: transform var(--transition-fast), box-shadow var(--transition-fast); }
.hover-lift:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.input-success-icon { color: var(--success); opacity: 0; transition: opacity var(--transition-fast); }
.input-success-icon.visible { opacity: 1; }
.input-error-msg { display: none; color: var(--error); font-size: var(--text-xs); margin-top: 4px; }
.input-error-msg.visible { display: block; }
.input--error { border-color: var(--error) !important; }
.input--success { border-color: var(--success) !important; }
kbd { display: inline-flex; align-items: center; justify-content: center; padding: 2px 8px; background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: var(--radius-sm); font-size: 12px; font-family: var(--font-mono); font-weight: 600; min-width: 28px; }