/* ─────────────────────────────────────────────────────────────────────
 * Button (.sat-btn) — universal action-button component.
 * 5 styles × 3 sizes × 4 states (default/hover/disabled/loading).
 * Tokens-only; no raw hex/rgb/radius/transition values.
 * Source: app/Views/partials/action-button.php
 * ───────────────────────────────────────────────────────────────────── */

.sat-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1.2;
    text-decoration: none;
    cursor: pointer;
    user-select: none;
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.sat-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--brand-primary);
}

.sat-btn:active {
    transform: translateY(1px);
}

.sat-btn__icon,
.sat-btn__spinner {
    flex-shrink: 0;
    line-height: 1;
}

.sat-btn__form {
    display: inline-block;
    margin: 0;
    padding: 0;
}

/* ---------- Sizes ---------- */
.sat-btn--sm {
    height: 32px;
    padding: 0 0.75rem;
    font-size: 0.8125rem;
    gap: 0.375rem;
}

.sat-btn--md {
    height: 40px;
    padding: 0 1rem;
    font-size: 0.875rem;
}

.sat-btn--lg {
    height: 48px;
    padding: 0 1.5rem;
    font-size: 0.9375rem;
}

/* ---------- Styles ---------- */

/* Primary — filled brand color, the page's main action */
.sat-btn--primary {
    background: var(--brand-primary);
    color: #fff;
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-sm);
}

.sat-btn--primary:hover:not(.sat-btn--disabled) {
    background: var(--brand-primary-hover);
    border-color: var(--brand-primary-hover);
    box-shadow: var(--shadow-md);
}

/* Secondary — outlined neutral, important alternative */
.sat-btn--secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-secondary);
}

.sat-btn--secondary:hover:not(.sat-btn--disabled) {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    background: var(--brand-primary-subtle);
}

/* Muted — text-only with hover background, tertiary action */
.sat-btn--muted {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

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

/* Destructive — filled red, irreversible actions */
.sat-btn--destructive {
    background: var(--error);
    color: #fff;
    border-color: var(--error);
    box-shadow: var(--shadow-sm);
}

.sat-btn--destructive:hover:not(.sat-btn--disabled) {
    background: var(--error-light);
    border-color: var(--error-light);
    box-shadow: var(--shadow-md);
}

/* Link — looks like inline navigation, no chrome */
.sat-btn--link {
    background: transparent;
    color: var(--brand-primary);
    border-color: transparent;
    height: auto;
    padding: 0;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.sat-btn--link:hover:not(.sat-btn--disabled) {
    color: var(--brand-primary-hover);
    text-decoration-thickness: 2px;
}

/* ---------- States ---------- */

.sat-btn--disabled {
    cursor: not-allowed;
    background: var(--bg-tertiary);
    color: var(--text-quaternary);
    border-color: var(--border-primary);
    box-shadow: none;
    transform: none;
}

.sat-btn--disabled:hover {
    background: var(--bg-tertiary);
    color: var(--text-quaternary);
    border-color: var(--border-primary);
}

.sat-btn--link.sat-btn--disabled {
    background: transparent;
    border-color: transparent;
    text-decoration: none;
}

.sat-btn--loading {
    pointer-events: none;
}

.sat-btn--loading .sat-btn__icon {
    display: none;
}