:root {
    --primary: #ff6f00;
    --primary-dark: #e65100;
    --primary-light: #ffe0b2;
    --secondary: #263238;
    --accent: #00acc1;
    --success: #43a047;
    --warning: #fb8c00;
    --danger: #e53935;
    --info: #039be5;
    --light: #f5f5f5;
    --dark: #212121;
    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #eeeeee;
    --gray-300: #e0e0e0;
    --gray-400: #bdbdbd;
    --gray-500: #9e9e9e;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
}

/* Header Styles */
.main-header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 0.75rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.75rem;
}

.nav-link {
    color: var(--gray-700) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    color: var(--primary) !important;
    background-color: var(--primary-light);
}

.nav-link i {
    font-size: 1.1rem;
}

.navbar-search {
    flex: 1;
    max-width: 500px;
    margin: 0 2rem;
}

.navbar-search .input-group {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.navbar-search .form-control {
    border: none;
    background: transparent;
    padding: 0.75rem 1rem;
}

.navbar-search .btn {
    background: transparent;
    border: none;
    padding: 0.75rem 1rem;
    color: var(--gray-600);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-outline-primary:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background: var(--gray-300);
    color: var(--gray-800);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}

.btn-success:hover {
    background: #388e3c;
    color: var(--white);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
}

.btn-danger:hover {
    background: #c62828;
    color: var(--white);
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
}

/* Cards */
.card {
    background: var(--white);
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-4px);
}

.card-img-wrapper {
    position: relative;
    overflow: hidden;
    padding-top: 75%;
}

.card-img-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.card:hover .card-img-wrapper img {
    transform: scale(1.05);
}

.card-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.card-badge-new {
    background: var(--accent);
    color: var(--white);
}

.card-badge-popular {
    background: var(--warning);
    color: var(--white);
}

.card-badge-sale {
    background: var(--danger);
    color: var(--white);
}

.card-body {
    padding: 1rem;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-text {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.card-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.card-price .original-price {
    font-size: 0.9rem;
    color: var(--gray-500);
    text-decoration: line-through;
    margin-left: 0.5rem;
    font-weight: 400;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.5rem;
}

.card-meta i {
    margin-right: 0.25rem;
}

.card-actions {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

.card:hover .card-actions {
    opacity: 1;
}

.btn-wishlist {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--white);
    border: none;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-wishlist:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-wishlist.active {
    background: var(--danger);
    color: var(--white);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, #ff8f00 100%);
    color: var(--white);
    padding: 4rem 0;
    margin-bottom: 2rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* Categories */
.categories-section {
    padding: 2rem 0;
}

.category-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.category-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.category-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 1rem;
    transition: var(--transition);
}

.category-card:hover .category-icon {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.category-card h6 {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.category-card span {
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* Forms */
.form-control, .form-select {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 111, 0, 0.1);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-floating label {
    color: var(--gray-500);
}

.input-group-text {
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    color: var(--gray-600);
}

.input-group .form-control {
    border-radius: var(--radius-sm);
}

/* Auth Pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--white) 100%);
    padding: 2rem;
}

.auth-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 480px;
    overflow: hidden;
}

.auth-header {
    background: linear-gradient(135deg, var(--primary) 0%, #ff8f00 100%);
    color: var(--white);
    padding: 2rem;
    text-align: center;
}

.auth-header h1 {
    color: var(--white);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.auth-header p {
    opacity: 0.9;
}

.auth-body {
    padding: 2rem;
}

.auth-footer {
    background: var(--gray-50);
    padding: 1.5rem 2rem;
    text-align: center;
    border-top: 1px solid var(--gray-200);
}

.social-login {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.social-login .btn {
    flex: 1;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-300);
}

/* Profile Page */
.profile-header {
    background: linear-gradient(135deg, var(--primary) 0%, #ff8f00 100%);
    padding: 3rem 0 6rem;
    color: var(--white);
}

.profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--white);
    border: 4px solid var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary);
    margin: 0 auto -60px;
    position: relative;
    z-index: 10;
    overflow: hidden;
}

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

.profile-info {
    text-align: center;
    color: var(--white);
    margin-top: 1rem;
}

.profile-info h2 {
    color: var(--white);
    margin-bottom: 0.25rem;
}

.profile-info .location {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    opacity: 0.9;
}

.profile-stats {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-top: 2rem;
    display: flex;
    justify-content: space-around;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--gray-600);
}

.profile-tabs {
    margin-top: 2rem;
}

.profile-tabs .nav-link {
    color: var(--gray-600) !important;
    font-weight: 500;
    padding: 1rem 1.5rem;
    border-bottom: 3px solid transparent;
    border-radius: 0;
}

.profile-tabs .nav-link.active {
    color: var(--primary) !important;
    border-bottom-color: var(--primary);
    background: transparent;
}

/* Listing Details */
.listing-detail {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.listing-gallery {
    position: relative;
}

.main-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    background: var(--gray-200);
}

.image-nav {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
}

.image-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: var(--transition);
}

.image-dot.active {
    background: var(--white);
    width: 30px;
    border-radius: 5px;
}

.listing-content {
    padding: 2rem;
}

.listing-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.listing-price-large {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.listing-meta {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.meta-item {
    text-align: center;
}

.meta-item i {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.meta-item span {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-600);
}

.seller-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.seller-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.seller-info h5 {
    margin-bottom: 0.25rem;
}

.seller-info p {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin: 0;
}

.seller-rating {
    color: var(--warning);
}

.listing-description {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.listing-description h4 {
    margin-bottom: 1rem;
}

.listing-description p {
    color: var(--gray-700);
    line-height: 1.8;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.action-buttons .btn {
    flex: 1;
}

/* Admin Dashboard */
.admin-sidebar {
    background: var(--secondary);
    min-height: 100vh;
    padding: 0;
}

.admin-logo {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.admin-logo h4 {
    color: var(--white);
    font-weight: 700;
    margin: 0;
}

.admin-menu {
    padding: 1rem 0;
}

.admin-menu .nav-link {
    color: rgba(255,255,255,0.7) !important;
    padding: 0.875rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-left: 3px solid transparent;
}

.admin-menu .nav-link:hover {
    background: rgba(255,255,255,0.05);
    color: var(--white) !important;
}

.admin-menu .nav-link.active {
    background: rgba(255,111,0,0.1);
    color: var(--primary) !important;
    border-left-color: var(--primary);
}

.admin-menu .nav-link i {
    width: 20px;
    text-align: center;
}

.admin-main {
    background: var(--gray-100);
    min-height: 100vh;
}

.admin-header {
    background: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.admin-content {
    padding: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary { background: rgba(255,111,0,0.1); color: var(--primary); }
.stat-icon.success { background: rgba(67,160,71,0.1); color: var(--success); }
.stat-icon.info { background: rgba(3,155,229,0.1); color: var(--info); }
.stat-icon.warning { background: rgba(251,140,0,0.1); color: var(--warning); }

.stat-info h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-info p {
    color: var(--gray-600);
    margin: 0;
    font-size: 0.9rem;
}

/* Table */
.data-table {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.data-table .table {
    margin: 0;
}

.data-table thead th {
    background: var(--gray-100);
    border-bottom: none;
    font-weight: 600;
    color: var(--gray-700);
    padding: 1rem;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.data-table tbody td {
    padding: 1rem;
    vertical-align: middle;
    border-color: var(--gray-200);
}

.status-badge {
    padding: 0.375rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-active, .status-completed, .status-approved {
    background: rgba(67,160,71,0.1);
    color: var(--success);
}

.status-pending {
    background: rgba(251,140,0,0.1);
    color: var(--warning);
}

.status-inactive, .status-rejected, .status-cancelled {
    background: rgba(229,57,53,0.1);
    color: var(--danger);
}

/* Footer */
.main-footer {
    background: var(--secondary);
    color: rgba(255,255,255,0.7);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-title {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 2rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Pagination */
.pagination {
    gap: 0.5rem;
}

.page-link {
    border: none;
    border-radius: var(--radius-sm);
    color: var(--gray-700);
    padding: 0.5rem 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.page-link:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.page-item.active .page-link {
    background: var(--primary);
    color: var(--white);
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
}

.alert-success {
    background: rgba(67,160,71,0.1);
    color: var(--success);
}

.alert-danger {
    background: rgba(229,57,53,0.1);
    color: var(--danger);
}

.alert-warning {
    background: rgba(251,140,0,0.1);
    color: var(--warning);
}

.alert-info {
    background: rgba(3,155,229,0.1);
    color: var(--info);
}

/* Utilities */
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--gray-600) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }

.bg-primary { background-color: var(--primary) !important; }
.bg-secondary { background-color: var(--secondary) !important; }
.bg-success { background-color: var(--success) !important; }
.bg-danger { background-color: var(--danger) !important; }
.bg-warning { background-color: var(--warning) !important; }
.bg-info { background-color: var(--info) !important; }

.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-xl { border-radius: var(--radius-xl) !important; }

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* Responsive */
@media (max-width: 992px) {
    .navbar-search {
        display: none;
    }

    .hero-title {
        font-size: 2rem;
    }

    .profile-header {
        padding: 2rem 0 5rem;
    }

    .profile-avatar {
        width: 100px;
        height: 100px;
        font-size: 2.5rem;
        margin-bottom: -50px;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .listing-meta {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .admin-sidebar {
        position: fixed;
        left: -280px;
        width: 280px;
        z-index: 1000;
        transition: var(--transition);
    }

    .admin-sidebar.show {
        left: 0;
    }

    .main-image {
        height: 250px;
    }
}

@media (max-width: 576px) {
    .auth-card {
        max-width: 100%;
    }

    .category-card {
        padding: 1rem;
    }

    .category-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
}