/* ================================================================
 * DATEI: css/components/buttons.css
 * ZWECK: Button-Styles fuer alle Varianten (.btn, .btn-primary, .btn-icon, etc.)
 * AESTHETIC: "Refined Brass Studio" - warm charcoal, brass/gold accents
 * REFERENZIERT: css/variables.css (CSS Custom Properties)
 * REFERENZIERT VON: index.html, login.html
 * ================================================================ */

/* ========== BASE BUTTON ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 7px var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-sm);
    font-weight: 600;
    line-height: 1.3;
    cursor: pointer;
    transition: background var(--transition-normal),
                border-color var(--transition-normal),
                box-shadow var(--transition-normal),
                filter var(--transition-normal);
    white-space: nowrap;
    -webkit-font-smoothing: antialiased;
}

.btn:active:not(:disabled) {
    transform: scale(0.97);
}

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

/* ========== PRIMARY (Brass Gold) ========== */
.btn-primary {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: 0 2px 10px var(--brass-subtle);
}

.btn-primary:active:not(:disabled) {
    filter: brightness(0.95);
}

/* ========== SECONDARY ========== */
.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

/* ========== DANGER ========== */
.btn-danger {
    background: var(--accent-danger);
    color: var(--text-on-dark);
    border-color: transparent;
}

.btn-danger:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: 0 2px 10px var(--danger-subtle);
}

/* ========== GHOST (transparent, text only) ========== */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

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

/* ========== OUTLINE ========== */
.btn-outline {
    background: transparent;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--accent-primary-transparent);
}

/* ========== ACCENT (alias for primary) ========== */
.btn-accent {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.btn-accent:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: 0 2px 10px var(--brass-subtle);
}

/* ========== SIZE: SMALL ========== */
.btn-sm {
    padding: 4px var(--space-3);
    font-size: var(--font-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
}

/* ========== BLOCK (full width) ========== */
.btn-block {
    width: 100%;
}

/* ========== ICON BUTTON (32x32) ========== */
.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-normal),
                color var(--transition-normal);
    flex-shrink: 0;
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-icon:active {
    background: var(--bg-active);
}

/* ========== DISABLED STATE ========== */
.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}