/* ============================================================
   button.css
   Usage: Primary, secondary, danger buttons
   Philosophy: Minimal, Apple-like. One primary action per view.
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    border: none;
    font-family: var(--font-sans);
    font-size: var(--text-callout);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-normal);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-smooth);
    white-space: nowrap;
    user-select: none;
    line-height: 1.2;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

/* Primary — one per view. The main action. */
.btn--primary {
    background: var(--info);
    color: white;
}

.btn--primary:hover:not(:disabled) {
    background: var(--info);
    filter: brightness(1.1);
}

.btn--primary:active:not(:disabled) {
    transform: scale(0.98);
}

/* Secondary — standard actions */
.btn--secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 0.5px solid var(--separator);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--separator-opaque);
}

/* Ghost — tertiary actions */
.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn--ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Danger — destructive actions (close position, delete) */
.btn--danger {
    background: var(--danger-subtle);
    color: var(--danger);
    border: 0.5px solid var(--danger-border);
}

.btn--danger:hover:not(:disabled) {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

/* Size variants */
.btn--small {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-footnote);
}

.btn--large {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-body);
}

/* Full width in mobile contexts */
.btn--block {
    width: 100%;
}