/* ============================================================================
   BUTTONS — complements root.css .neu-btn / .neu-btn-primary
   ============================================================================ */

.modular-btn,
.neu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    border: none;
    border-radius: var(--radius-medium);
    padding: var(--space-sm) var(--space-lg);
    font: inherit;
    font-weight: var(--font-medium, 500);
    cursor: pointer;
    background: var(--glass-sheen), var(--glass-fill);
    color: var(--color-text-light);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-highlight);
    transition: box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

.modular-btn:hover,
.neu-btn:hover {
    transform: translateY(-1px);
}

.modular-btn:active,
.neu-btn:active {
    box-shadow: var(--glass-well-shadow);
    transform: translateY(0);
}

.modular-btn:focus-visible,
.neu-btn:focus-visible {
    outline: none;
    box-shadow: var(--glass-highlight), var(--focus-ring);
}

.modular-btn:disabled,
.neu-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Pill shape variant */
.modular-btn-pill {
    border-radius: var(--radius-pill);
}

/* Primary (accent-filled) */
.modular-btn-primary,
.neu-btn-primary,
.clients-add-btn,
.invoice-btn-primary {
    background: var(--color-primary);
    color: var(--primary-text, #fff);
    border-color: transparent;
    box-shadow: var(--glass-highlight), var(--glass-glow);
}

.modular-btn-primary:hover,
.neu-btn-primary:hover,
.clients-add-btn:hover,
.invoice-btn-primary:hover {
    background: var(--color-primary-dark, var(--color-hover));
}

.modular-btn-primary:active,
.neu-btn-primary:active,
.clients-add-btn:active,
.invoice-btn-primary:active {
    box-shadow: var(--glass-well-shadow);
}

/* Secondary / neutral */
.modular-btn-secondary {
    background: var(--glass-sheen), var(--glass-fill);
    color: var(--color-text-light);
}

/* Ghost — no shadow until hover */
.modular-btn-ghost {
    background: transparent;
    box-shadow: none;
    color: var(--color-text-secondary);
}

.modular-btn-ghost:hover {
    color: var(--color-primary);
    box-shadow: var(--glass-highlight);
}

/* Icon-only */
.modular-btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
}

.modular-btn .material-icons,
.clients-add-btn .material-icons {
    font-size: 1.1rem;
}

/* Guided affordance pulse on recommended next action */
.modular-btn-pulse,
.clients-add-btn.guide-pulse {
    animation: modularGuidePulse 2s ease-in-out infinite;
}

@keyframes modularGuidePulse {
    0%   { box-shadow: var(--glass-highlight), var(--glass-glow), 0 0 0 0 rgba(var(--primary-rgb, 37, 99, 235), 0.45); }
    70%  { box-shadow: var(--glass-highlight), var(--glass-glow), 0 0 0 10px rgba(var(--primary-rgb, 37, 99, 235), 0); }
    100% { box-shadow: var(--glass-highlight), var(--glass-glow), 0 0 0 0 rgba(var(--primary-rgb, 37, 99, 235), 0); }
}

@media (prefers-reduced-motion: reduce) {
    .modular-btn,
    .neu-btn { transition: none; }
    .modular-btn:hover,
    .neu-btn:hover { transform: none; }
    .modular-btn-pulse,
    .clients-add-btn.guide-pulse { animation: none; }
}