/* =============================================================================
   SleepGuardian — Components
   Reusable UI components: buttons, inputs, cards, badges, dialogs, toggles
   ============================================================================= */

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.btn:active { transform: scale(0.97); }
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 2px 12px var(--primary-glow);
}
.btn-primary:hover:not(:disabled) {
    box-shadow: 0 4px 20px rgba(124, 77, 255, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-surface-raised);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}
.btn-secondary:hover:not(:disabled) {
    background: var(--bg-surface-hover);
    border-color: var(--primary);
}

.btn-danger {
    background: rgba(255, 82, 82, 0.15);
    color: var(--poor);
    border: 1px solid rgba(255, 82, 82, 0.3);
}
.btn-danger:hover:not(:disabled) {
    background: rgba(255, 82, 82, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 12px;
}
.btn-ghost:hover:not(:disabled) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
}

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { width: 100%; }

/* ── Inputs ────────────────────────────────────────────────────────────────── */
.input-group {
    position: relative;
    margin-bottom: var(--space-md);
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-field {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    outline: none;
}

.input-field::placeholder {
    color: var(--text-dim);
}

.input-field:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-field:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-with-icon {
    position: relative;
}

.input-with-icon .input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
}

.input-with-icon .input-field {
    padding-left: 42px;
}

.input-with-icon .input-action {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    font-size: 1rem;
    transition: color var(--transition-fast);
}

.input-with-icon .input-action:hover {
    color: var(--text-primary);
}

select.input-field {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%239FA8DA'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

/* ── Cards ─────────────────────────────────────────────────────────────────── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--border-medium);
}

.card-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-medium);
}

.card-elevated {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.card-header h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ── Stat Card ─────────────────────────────────────────────────────────────── */
.stat-card {
    text-align: center;
    padding: var(--space-lg);
}

.stat-card .stat-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    opacity: 0.8;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* ── Badges ────────────────────────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
}

.badge-good   { background: var(--good-bg); color: var(--good); }
.badge-fair   { background: var(--fair-bg); color: var(--fair); }
.badge-poor   { background: var(--poor-bg); color: var(--poor); }
.badge-snore  { background: var(--snore-bg); color: var(--snore); }
.badge-info   { background: var(--secondary-dim); color: var(--secondary); }
.badge-muted  { background: rgba(255,255,255,0.06); color: var(--text-muted); }

/* ── Toggle Switch ─────────────────────────────────────────────────────────── */
.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    cursor: pointer;
    flex-shrink: 0;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--bg-surface-hover);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-medium);
    transition: all var(--transition-normal);
}

.toggle input:checked + .toggle-track {
    background: var(--primary);
    border-color: var(--primary);
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--transition-normal);
    pointer-events: none;
}

.toggle input:checked ~ .toggle-thumb {
    transform: translateX(20px);
}

/* ── Day Chips ─────────────────────────────────────────────────────────────── */
.day-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.day-chip {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-medium);
    background: var(--bg-surface);
    color: var(--text-muted);
    transition: all var(--transition-fast);
    user-select: none;
}

.day-chip:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.day-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 0 10px var(--primary-glow);
}

.day-chip-sm {
    width: 26px;
    height: 26px;
    font-size: 0.65rem;
    cursor: default;
}

/* ── Modal / Dialog ────────────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 5000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    animation: fadeIn 200ms ease;
}

.modal-overlay.hidden { display: none; }

.modal {
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-normal);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: var(--space-lg);
}

/* ── Empty State ───────────────────────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.4;
}

.empty-state .empty-title {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.empty-state .empty-text {
    font-size: 0.875rem;
    max-width: 320px;
    margin: 0 auto;
    line-height: 1.5;
}

/* ── Error State ───────────────────────────────────────────────────────────── */
.error-state {
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
}

.error-state .error-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.error-state .error-text {
    color: var(--poor);
    margin-bottom: var(--space-md);
}

/* ── Confirm Dialog ────────────────────────────────────────────────────────── */
.confirm-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ── Range Slider ──────────────────────────────────────────────────────────── */
.range-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--bg-surface-hover);
    outline: none;
    margin: 8px 0;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 8px var(--primary-glow);
    transition: transform var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .modal {
        max-width: 100%;
        border-radius: var(--radius-lg);
        padding: var(--space-lg);
    }
}