/* Button Components */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--button-gap);
    padding: var(--button-padding-y) var(--button-padding-x);
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-medium);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
    min-height: var(--min-touch-target);
}

.btn:focus-visible {
    outline: var(--focus-outline-width) solid var(--color-primary-100);
    outline-offset: var(--focus-outline-offset);
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Primary Button */
.btn-primary {
    background-color: var(--color-primary-100);
    color: var(--color-white);
    box-shadow: var(--shadow-small);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-80);
    box-shadow: var(--shadow-button-hover);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-small);
}

.btn-primary:disabled {
    background-color: var(--color-gray-20);
    color: var(--color-gray-60);
    box-shadow: none;
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary-100);
    border: 2px solid var(--color-primary-100);
    padding: calc(var(--button-padding-y) - 2px) calc(var(--button-padding-x) - 2px);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-primary-10);
    border-color: var(--color-primary-80);
    transform: translateY(-1px);
}

.btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary:disabled {
    background-color: var(--color-white);
    border-color: var(--color-gray-40);
    color: var(--color-gray-60);
}

/* Danger / Destructive Button */
.btn-danger {
    background-color: var(--color-error-100);
    color: var(--color-white);
    box-shadow: var(--shadow-small);
}

.btn-danger:hover:not(:disabled) {
    background-color: #b91c1c;
    box-shadow: var(--shadow-button-hover);
    transform: translateY(-1px);
}

.btn-danger:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-small);
}

.btn-danger:disabled {
    background-color: var(--color-gray-20);
    color: var(--color-gray-60);
    box-shadow: none;
}

/* Tertiary Button */
.btn-tertiary {
    background-color: transparent;
    color: var(--color-primary-100);
    padding: var(--space-2) var(--space-4);
}

.btn-tertiary:hover:not(:disabled) {
    background-color: var(--color-primary-10);
    color: var(--color-primary-80);
}

.btn-tertiary:disabled {
    color: var(--color-gray-60);
}

/* Button Sizes */
.btn-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-body-small);
    min-height: 36px;
}

.btn-large {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-body-large);
    min-height: 52px;
}

/* Button Group */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--button-group-gap);
    align-items: center;
}

/* Full Width Button (Mobile) */
@media (max-width: 767px) {
    .btn-mobile-full {
        width: 100%;
    }
}