/**
 * ECOS DESIGN SYSTEM — Primitives: Button
 * Classes: .ecos-button
 * Variantes: --primary | --secondary | --ghost | --danger | --outline
 * Tamanhos: --sm | (default) | --lg | --full
 * Estados: :hover :focus-visible :disabled
 *
 * AGENT_GUIDE: Botão base do sistema.
 * Para CTA principal de landing: .ecos-button.ecos-button--primary.ecos-button--lg
 * Para botão de ação secundária: .ecos-button.ecos-button--secondary
 * Ref: AGENT_GUIDE.md#primitives | core/tokens.css
 */

.ecos-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--ecos-space-2);
    padding: var(--ecos-space-3) var(--ecos-space-6);
    font-family: var(--ecos-font-sans);
    font-size: var(--ecos-text-base);
    font-weight: var(--ecos-font-semibold);
    line-height: 1;
    border-radius: var(--ecos-radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    transition:
        background-color var(--ecos-transition-fast),
        border-color var(--ecos-transition-fast),
        box-shadow var(--ecos-transition-fast),
        transform var(--ecos-transition-fast);
    min-height: var(--ecos-touch-min);
    user-select: none;
}

.ecos-button:focus-visible {
    outline: var(--ecos-ring-width) solid var(--ecos-ring-color);
    outline-offset: var(--ecos-ring-offset);
}

/* Variantes */
.ecos-button--primary {
    background: var(--ecos-color-primary);
    color: var(--ecos-color-text-on-accent);
    border-color: var(--ecos-color-primary);
}

.ecos-button--primary:hover:not(:disabled) {
    background: var(--ecos-color-primary-hover);
    border-color: var(--ecos-color-primary-hover);
    box-shadow: var(--ecos-shadow-md);
    transform: translateY(-1px);
}

.ecos-button--cta {
    background: var(--ecos-color-cta);
    color: var(--ecos-color-text-on-accent);
    border-color: var(--ecos-color-cta);
    transform: rotate(-1deg);
}

.ecos-button--cta:hover:not(:disabled) {
    background: var(--ecos-color-cta-hover);
    transform: rotate(-1deg) translateY(-2px) scale(1.02);
    box-shadow: var(--ecos-shadow-lg);
}

.ecos-button--cta:active:not(:disabled) {
    transform: rotate(-1deg) scale(0.98);
}

.ecos-button--secondary {
    background: transparent;
    color: var(--ecos-color-primary);
    border-color: var(--ecos-color-primary);
}

.ecos-button--secondary:hover:not(:disabled) {
    background: var(--ecos-color-primary-light);
    box-shadow: var(--ecos-shadow-sm);
}

.ecos-button--ghost {
    background: transparent;
    color: var(--ecos-color-text);
    border-color: transparent;
}

.ecos-button--ghost:hover:not(:disabled) {
    background: var(--ecos-color-surface-2);
}

.ecos-button--outline {
    background: transparent;
    color: var(--ecos-color-text);
    border-color: var(--ecos-color-border);
}

.ecos-button--outline:hover:not(:disabled) {
    border-color: var(--ecos-color-primary);
    color: var(--ecos-color-primary);
    background: var(--ecos-color-primary-light);
}

.ecos-button--danger {
    background: var(--ecos-color-danger);
    color: var(--ecos-color-text-on-accent);
    border-color: var(--ecos-color-danger);
}

.ecos-button--danger:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: var(--ecos-shadow-md);
}

/* Tamanhos */
.ecos-button--sm {
    padding: var(--ecos-space-2) var(--ecos-space-4);
    font-size: var(--ecos-text-sm);
    min-height: auto;
}

.ecos-button--lg {
    padding: var(--ecos-space-4) var(--ecos-space-8);
    font-size: var(--ecos-text-lg);
    border-radius: var(--ecos-radius-lg);
}

.ecos-button--full {
    width: 100%;
}

/* Reset */
.ecos-button--icon {
    padding: var(--ecos-space-2);
    width: var(--ecos-touch-min);
    height: var(--ecos-touch-min);
    border-radius: var(--ecos-radius-md);
}

/* Disabled */
.ecos-button:disabled,
.ecos-button[aria-disabled="true"] {
    opacity: var(--ecos-opacity-disabled);
    cursor: var(--ecos-cursor-disabled);
    pointer-events: none;
}

/* Loading */
.ecos-button--loading {
    pointer-events: none;
    opacity: 0.7;
    position: relative;
}

.ecos-button--loading::after {
    content: '';
    width: 1em;
    height: 1em;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-top-color: white;
    border-radius: 50%;
    animation: ecos-spin 0.7s linear infinite;
}

@keyframes ecos-spin {
    to {
        transform: rotate(360deg);
    }
}