/* KICDA Button System - Using Design Tokens */
/* 디자인 토큰을 활용한 일관된 버튼 시스템 */

/* Base Button Styles */
.btn,
.nav-btn,
[role="button"],
button {
    /* Layout */
    display: inline-block;
    padding: var(--kicda-space-2, 0.5rem) var(--kicda-space-4, 1rem);

    /* Typography */
    font-family: var(--kicda-font-primary, 'Noto Sans KR', sans-serif);
    font-size: var(--kicda-text-sm, 0.875rem);
    font-weight: var(--kicda-font-semibold, 600);
    line-height: var(--kicda-leading-normal, 1.5);
    text-decoration: none;
    text-align: center;

    /* Appearance */
    border-radius: 6px;
    border: 2px solid transparent;
    cursor: pointer;

    /* Transitions */
    transition: all 0.2s ease-in-out;

    /* States */
    user-select: none;
    white-space: nowrap;
}

/* Primary Button */
.btn-primary,
.nav-btn-primary {
    background-color: var(--kicda-primary, #2563eb);
    border-color: var(--kicda-primary, #2563eb);
    color: var(--kicda-white, #ffffff);
}

.btn-primary:hover,
.nav-btn-primary:hover {
    background-color: var(--kicda-primary-dark, #1e40af);
    border-color: var(--kicda-primary-dark, #1e40af);
    transform: translateY(-1px);
    box-shadow: var(--kicda-shadow-md, 0 4px 6px -1px rgb(0 0 0 / 0.1));
}

.btn-primary:active,
.nav-btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--kicda-shadow-sm, 0 1px 2px 0 rgb(0 0 0 / 0.05));
}

/* Outline Button */
.btn-outline,
.nav-btn-outline {
    background-color: transparent;
    border-color: var(--kicda-primary, #2563eb);
    color: var(--kicda-primary, #2563eb);
}

.btn-outline:hover,
.nav-btn-outline:hover {
    background-color: var(--kicda-primary, #2563eb);
    color: var(--kicda-white, #ffffff);
    transform: translateY(-1px);
    box-shadow: var(--kicda-shadow-md, 0 4px 6px -1px rgb(0 0 0 / 0.1));
}

.btn-outline:active,
.nav-btn-outline:active {
    transform: translateY(0);
    box-shadow: var(--kicda-shadow-sm, 0 1px 2px 0 rgb(0 0 0 / 0.05));
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--kicda-secondary, #06b6d4);
    border-color: var(--kicda-secondary, #06b6d4);
    color: var(--kicda-white, #ffffff);
}

.btn-secondary:hover {
    background-color: var(--kicda-secondary-dark, #0891b2);
    border-color: var(--kicda-secondary-dark, #0891b2);
    transform: translateY(-1px);
    box-shadow: var(--kicda-shadow-md, 0 4px 6px -1px rgb(0 0 0 / 0.1));
}

/* Success Button */
.btn-success {
    background-color: var(--kicda-success, #10b981);
    border-color: var(--kicda-success, #10b981);
    color: var(--kicda-white, #ffffff);
}

.btn-success:hover {
    background-color: var(--kicda-success-dark, #059669);
    border-color: var(--kicda-success-dark, #059669);
}

/* Danger Button */
.btn-danger {
    background-color: var(--kicda-danger, #ef4444);
    border-color: var(--kicda-danger, #ef4444);
    color: var(--kicda-white, #ffffff);
}

.btn-danger:hover {
    background-color: var(--kicda-danger-dark, #dc2626);
    border-color: var(--kicda-danger-dark, #dc2626);
}

/* Warning Button */
.btn-warning {
    background-color: var(--kicda-warning, #f59e0b);
    border-color: var(--kicda-warning, #f59e0b);
    color: var(--kicda-white, #ffffff);
}

.btn-warning:hover {
    background-color: var(--kicda-warning-dark, #d97706);
    border-color: var(--kicda-warning-dark, #d97706);
}

/* Ghost Button */
.btn-ghost {
    background-color: transparent;
    border-color: transparent;
    color: var(--kicda-primary, #2563eb);
}

.btn-ghost:hover {
    background-color: var(--kicda-light-gray, #f3f4f6);
    border-color: var(--kicda-light-gray, #f3f4f6);
}

/* Button Sizes */
.btn-sm {
    padding: var(--kicda-space-1, 0.25rem) var(--kicda-space-3, 0.75rem);
    font-size: var(--kicda-text-xs, 0.75rem);
}

.btn-lg {
    padding: var(--kicda-space-3, 0.75rem) var(--kicda-space-6, 1.5rem);
    font-size: var(--kicda-text-base, 1rem);
}

.btn-xl {
    padding: var(--kicda-space-4, 1rem) var(--kicda-space-8, 2rem);
    font-size: var(--kicda-text-lg, 1.125rem);
}

/* Full Width Button */
.btn-block {
    display: block;
    width: 100%;
}

/* Disabled State */
.btn:disabled,
.nav-btn:disabled,
.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Loading State */
.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid var(--kicda-white, #ffffff);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to { transform: rotate(360deg); }
}

/* Button Group */
.btn-group {
    display: inline-flex;
    border-radius: 6px;
    overflow: hidden;
}

.btn-group .btn {
    border-radius: 0;
    border-right-width: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
}

.btn-group .btn:last-child {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
    border-right-width: 2px;
}

/* Icon Buttons */
.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: var(--kicda-space-2, 0.5rem);
}

.btn-icon-only {
    padding: var(--kicda-space-2, 0.5rem);
    aspect-ratio: 1;
}

/* Focus States for Accessibility */
.btn:focus,
.nav-btn:focus {
    outline: 2px solid var(--kicda-primary, #2563eb);
    outline-offset: 2px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .btn,
    .nav-btn {
        min-height: 44px; /* Touch target size */
        padding: var(--kicda-space-3, 0.75rem) var(--kicda-space-4, 1rem);
    }

    .btn-sm {
        min-height: 36px;
    }
}