/* ============================================================
   This Car - 공통 컴포넌트 스타일
   ============================================================
   버튼, 입력 필드, 카드, 배지 등 재사용 가능한 컴포넌트
   ============================================================ */

/* ============================================================
   버튼 (Buttons)
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-xl);
}

.btn-xl {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-xl);
    border-radius: var(--radius-xl);
}

/* Button Variants */
.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--gradient-primary-hover);
    box-shadow: var(--shadow-primary-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--text-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-200);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-gray-100);
    color: var(--text-primary);
}

.btn-success {
    background: var(--gradient-accent);
    color: var(--text-inverse);
    box-shadow: var(--shadow-accent);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 217, 165, 0.3);
}

.btn-danger {
    background: var(--gradient-danger);
    color: var(--text-inverse);
    box-shadow: var(--shadow-error);
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 71, 87, 0.3);
}

.btn-warning {
    background: var(--gradient-warning);
    color: var(--text-inverse);
}

.btn-warning:hover:not(:disabled) {
    transform: translateY(-2px);
}

/* Kakao Button */
.btn-kakao {
    background: #FEE500;
    color: #000000;
    font-weight: var(--font-weight-semibold);
}

.btn-kakao:hover:not(:disabled) {
    background: #F5DC00;
}

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

/* Icon Only Button */
.btn-icon {
    padding: var(--space-3);
    border-radius: var(--radius-full);
}

.btn-icon.btn-sm {
    padding: var(--space-2);
}

.btn-icon.btn-lg {
    padding: var(--space-4);
}

/* ============================================================
   입력 필드 (Form Inputs)
   ============================================================ */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-label .required {
    color: var(--color-error);
    margin-left: var(--space-1);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1.5px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-input::placeholder {
    color: var(--text-muted);
    font-weight: var(--font-weight-normal);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background: var(--color-gray-100);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

/* Input with icon */
.input-icon-wrapper {
    position: relative;
}

.input-icon-wrapper .form-input {
    padding-left: var(--space-10);
}

.input-icon-wrapper .input-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

/* Input with button */
.input-with-btn {
    display: flex;
    gap: var(--space-2);
}

.input-with-btn .form-input {
    flex: 1;
}

.input-with-btn .btn {
    flex-shrink: 0;
}

/* Form hint/error text */
.form-hint {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--space-2);
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--space-2);
}

.form-success {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    margin-top: var(--space-2);
}

/* Input States */
.form-input.is-invalid,
.form-select.is-invalid {
    border-color: var(--color-error);
}

.form-input.is-invalid:focus {
    box-shadow: 0 0 0 3px var(--color-error-light);
}

.form-input.is-valid,
.form-select.is-valid {
    border-color: var(--color-success);
}

.form-input.is-valid:focus {
    box-shadow: 0 0 0 3px var(--color-success-light);
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
    cursor: pointer;
}

/* Textarea */
.form-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: var(--line-height-relaxed);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    cursor: pointer;
}

.form-check-input {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--color-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.form-check-label {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ============================================================
   카드 (Cards)
   ============================================================ */

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-card-hover);
}

.card-clickable:hover {
    transform: translateY(-4px);
    cursor: pointer;
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
}

.card-body {
    padding: var(--space-6);
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

/* Card Image */
.card-image {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

/* ============================================================
   배지 (Badges)
   ============================================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 1.4;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.badge-md {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
}

.badge-lg {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
}

/* Badge Colors */
.badge-primary {
    background: var(--color-primary-100);
    color: var(--color-primary);
}

.badge-success {
    background: var(--color-success-light);
    color: var(--color-success);
}

.badge-warning {
    background: var(--color-warning-light);
    color: #B7791F;
}

.badge-error {
    background: var(--color-error-light);
    color: var(--color-error);
}

.badge-info {
    background: var(--color-info-light);
    color: var(--color-info);
}

.badge-gray {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

/* Pill Badges */
.badge-pill {
    border-radius: var(--radius-full);
    padding: var(--space-1) var(--space-3);
}

/* ============================================================
   모달 (Modals)
   ============================================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal-backdrop);
    padding: var(--space-4);
    animation: fadeIn var(--transition-base);
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    animation: slideUp var(--transition-slow);
}

.modal-sm {
    max-width: 360px;
}

.modal-lg {
    max-width: 640px;
}

.modal-xl {
    max-width: 800px;
}

.modal-fullscreen {
    max-width: 100%;
    max-height: 100%;
    height: 100%;
    border-radius: 0;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-gray-100);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-gray-200);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-light);
}

.modal-footer .btn {
    flex: 1;
}

/* Modal Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   알림/토스트 (Alerts/Toasts)
   ============================================================ */

.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    line-height: var(--line-height-snug);
}

.alert-icon {
    flex-shrink: 0;
    font-size: var(--font-size-xl);
}

.alert-success {
    background: var(--color-success-light);
    color: #065F46;
}

.alert-success .alert-icon {
    color: var(--color-success);
}

.alert-warning {
    background: var(--color-warning-light);
    color: #92400E;
}

.alert-warning .alert-icon {
    color: var(--color-warning);
}

.alert-error {
    background: var(--color-error-light);
    color: #9B1C1C;
}

.alert-error .alert-icon {
    color: var(--color-error);
}

.alert-info {
    background: var(--color-info-light);
    color: #1E40AF;
}

.alert-info .alert-icon {
    color: var(--color-info);
}

/* ============================================================
   로딩 스피너 (Loading Spinner)
   ============================================================ */

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

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

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    background: rgba(255, 255, 255, 0.9);
    z-index: 10;
}

.loading-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

/* ============================================================
   빈 상태 (Empty States)
   ============================================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12) var(--space-6);
    text-align: center;
}

.empty-state-icon {
    font-size: 48px;
    color: var(--color-gray-300);
    margin-bottom: var(--space-4);
}

.empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state-description {
    font-size: var(--font-size-base);
    color: var(--text-muted);
    margin-bottom: var(--space-6);
    max-width: 320px;
}

/* ============================================================
   구분선 (Dividers)
   ============================================================ */

.divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-6) 0;
}

.divider-with-text {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.divider-with-text::before,
.divider-with-text::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

/* ============================================================
   아바타 (Avatars)
   ============================================================ */

.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: var(--text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    overflow: hidden;
    flex-shrink: 0;
}

.avatar-sm {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-sm);
}

.avatar-lg {
    width: 56px;
    height: 56px;
    font-size: var(--font-size-xl);
}

.avatar-xl {
    width: 80px;
    height: 80px;
    font-size: var(--font-size-3xl);
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================================
   태그 (Tags)
   ============================================================ */

.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    background: var(--color-gray-100);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
}

.tag-primary {
    background: var(--color-primary-100);
    color: var(--color-primary);
}

.tag-removable {
    padding-right: var(--space-2);
}

.tag-remove {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: 10px;
    transition: background var(--transition-fast);
}

.tag-remove:hover {
    background: rgba(0, 0, 0, 0.1);
}

/* ============================================================
   토글 스위치 (Toggle Switch)
   ============================================================ */

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-base);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 2px;
    bottom: 2px;
    background: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--color-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

/* ============================================================
   탭 (Tabs)
   ============================================================ */

.tabs {
    display: flex;
    gap: var(--space-1);
    border-bottom: 2px solid var(--border-light);
}

.tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-tertiary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* ============================================================
   페이지네이션 (Pagination)
   ============================================================ */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.page-btn {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.page-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.page-btn.active {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    border-color: transparent;
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ============================================================
   컨테이너 (Container)
   ============================================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* ============================================================
   반응형 유틸리티
   ============================================================ */

/* Hide on mobile */
@media (max-width: 639px) {
    .hide-mobile { display: none !important; }
}

/* Hide on tablet */
@media (min-width: 640px) and (max-width: 1023px) {
    .hide-tablet { display: none !important; }
}

/* Hide on desktop */
@media (min-width: 1024px) {
    .hide-desktop { display: none !important; }
}

/* Show only on mobile */
@media (min-width: 640px) {
    .show-mobile-only { display: none !important; }
}

/* Show only on desktop */
@media (max-width: 1023px) {
    .show-desktop-only { display: none !important; }
}

/* ============================================================
   드롭다운 (Dropdown)
   ============================================================ */

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-2);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    color: var(--text-muted);
}

.dropdown-item:hover i {
    color: var(--color-primary);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-2) 0;
}

/* ============================================================
   스켈레톤 로딩 (Skeleton Loading)
   ============================================================ */

.skeleton {
    background: linear-gradient(90deg, 
        var(--color-gray-100) 0%, 
        var(--color-gray-50) 50%, 
        var(--color-gray-100) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 16px;
    margin-bottom: var(--space-2);
}

.skeleton-text-sm {
    height: 12px;
}

.skeleton-text-lg {
    height: 24px;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
}

.skeleton-card {
    height: 200px;
}

.skeleton-image {
    width: 100%;
    aspect-ratio: 16 / 10;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================================
   플로팅 액션 버튼 (Floating Action Button)
   ============================================================ */

.fab {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-primary-lg);
    font-size: var(--font-size-xl);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
}

.fab-sm {
    width: 48px;
    height: 48px;
    font-size: var(--font-size-lg);
}

.fab-lg {
    width: 64px;
    height: 64px;
    font-size: var(--font-size-2xl);
}

/* ============================================================
   프로그레스 바 (Progress Bar)
   ============================================================ */

.progress {
    height: 8px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.progress-bar-success {
    background: var(--gradient-accent);
}

.progress-bar-warning {
    background: var(--gradient-warning);
}

.progress-bar-danger {
    background: var(--gradient-danger);
}

/* ============================================================
   툴팁 (Tooltip)
   ============================================================ */

[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    padding: var(--space-2) var(--space-3);
    background: var(--color-gray-800);
    color: var(--text-inverse);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-8px);
}

/* ============================================================
   아코디언 (Accordion)
   ============================================================ */

.accordion {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--border-light);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    background: var(--bg-primary);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.accordion-header:hover {
    background: var(--bg-secondary);
}

.accordion-icon {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    transition: transform var(--transition-base);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    display: none;
    padding: var(--space-4) var(--space-5);
    background: var(--bg-secondary);
}

.accordion-item.active .accordion-body {
    display: block;
}

/* ============================================================
   칩 (Chips)
   ============================================================ */

.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-default);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chip:hover {
    border-color: var(--color-primary-200);
    background: var(--color-primary-50);
}

.chip.active {
    background: var(--color-primary);
    color: var(--text-inverse);
    border-color: var(--color-primary);
}

/* ============================================================
   스텝 인디케이터 (Step Indicator)
   ============================================================ */

.steps {
    display: flex;
    align-items: center;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    position: relative;
}

.step-circle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-gray-200);
    color: var(--text-muted);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    z-index: 1;
    transition: all var(--transition-base);
}

.step.completed .step-circle {
    background: var(--color-success);
    color: var(--text-inverse);
}

.step.active .step-circle {
    background: var(--color-primary);
    color: var(--text-inverse);
    box-shadow: 0 0 0 4px var(--color-primary-100);
}

.step-label {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-muted);
    text-align: center;
}

.step.completed .step-label,
.step.active .step-label {
    color: var(--text-primary);
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 20px;
    left: calc(50% + 24px);
    right: calc(-50% + 24px);
    height: 2px;
    background: var(--color-gray-200);
}

.step.completed:not(:last-child)::after {
    background: var(--color-success);
}

/* ============================================================
   반응형 그리드 (Responsive Grid)
   ============================================================ */

.grid {
    display: grid;
    gap: var(--space-4);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 640px) {
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .sm\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}