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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --border-color: #e5e7eb;
    --text-color: #111827;
    --text-light: #6b7280;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --bg-color: #f3f4f6;
    --surface-color: #ffffff;
}

/* Dark theme */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #2563eb;
    --success-color: #34d399;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
    --info-color: #60a5fa;
    --dark-color: #e5e7eb;
    --light-color: #1f2937;
    --border-color: #374151;
    --text-color: #f3f4f6;
    --text-light: #9ca3af;
    --bg-color: #111827;
    --surface-color: #1f2937;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header h1 i {
    margin-right: 10px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-name {
    font-weight: 500;
}

.btn-logout {
    color: white;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
    background: rgba(255,255,255,0.2);
    transition: background 0.3s;
}

.btn-logout:hover {
    background: rgba(255,255,255,0.3);
}

/* Navigation */
.main-nav {
    background: var(--surface-color);
    box-shadow: var(--shadow);
    padding: 0;
    margin-bottom: 2rem;
    transition: background-color 0.3s;
}

.main-nav {
    display: flex;
    gap: 0;
    max-width: 1400px;
    margin: 0 auto 2rem;
    padding: 0 20px;
}

.nav-item {
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: var(--text-color);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item:hover {
    background: var(--light-color);
    border-bottom-color: var(--primary-color);
}

.nav-item.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px 2rem;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.module-card, .stats-card {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.module-card:hover, .stats-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.module-card h2, .stats-card h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.module-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--light-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
    border: 2px solid transparent;
}

.action-btn i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.action-btn span {
    font-weight: 500;
    text-align: center;
}

.action-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.action-btn:hover i {
    color: white;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1.25rem 1rem;
    background: var(--light-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Forms */
.form-container {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
    transition: background-color 0.3s;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group label i {
    margin-right: 5px;
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

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

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

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

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

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

.btn-warning {
    background: var(--warning-color);
    color: var(--dark-color);
}

.btn-secondary {
    background: var(--text-light);
    color: white;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.badge-danger {
    background: var(--danger-color);
    color: #fff;
}

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

.badge-warning {
    background: var(--warning-color);
    color: var(--dark-color);
}

.badge-secondary {
    background: var(--text-light);
    color: #fff;
}

/* Tables */
.table-container {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    overflow-x: auto;
    transition: background-color 0.3s;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    background: var(--light-color);
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
}

table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

table tr:hover {
    background: var(--light-color);
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--surface-color);
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    transition: background-color 0.3s;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.login-header h1 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.login-form {
    margin-bottom: 1.5rem;
}

.login-footer {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.85rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #93c5fd;
}

/* Cards */
.card {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    transition: background-color 0.3s;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Search and Filter */
.search-filter-bar {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    transition: background-color 0.3s;
}

.search-box {
    flex: 1;
    min-width: 200px;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 0.75rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        padding: 0;
    }
    
    .nav-item {
        border-bottom: 1px solid var(--border-color);
        border-left: 3px solid transparent;
    }
    
    .nav-item.active {
        border-left-color: var(--primary-color);
        border-bottom-color: var(--border-color);
    }
    
    .module-actions {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.product-card {
    background: var(--surface-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    width: 100%;
    height: 200px;
    background: var(--light-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.product-image i {
    font-size: 4rem;
    color: var(--text-light);
}

.product-info {
    padding: 1rem;
}

.product-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.product-price {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.product-stock {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface-color);
    border-radius: 10px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transition: background-color 0.3s;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.modal-close:hover {
    color: var(--text-color);
}

/* Theme toggle button */
.theme-toggle {
    background: rgba(255,255,255,0.2);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    transition: background 0.3s;
}
.theme-toggle:hover {
    background: rgba(255,255,255,0.3);
}
.theme-toggle-fixed {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    background: var(--primary-color);
    color: white;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s, background 0.3s;
}
.theme-toggle-fixed:hover {
    transform: scale(1.05);
}

/* Dark theme alert overrides */
[data-theme="dark"] .alert-error {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border-color: #b91c1c;
}
[data-theme="dark"] .alert-success {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
    border-color: #047857;
}
[data-theme="dark"] .alert-info {
    background: rgba(59, 130, 246, 0.2);
    color: #93c5fd;
    border-color: #1d4ed8;
}

/* Login sayfası dark tema */
[data-theme="dark"] .login-page {
    background: radial-gradient(circle at top, rgba(59, 130, 246, 0.25), #0f172a), #111827;
}
[data-theme="dark"] .login-wrapper {
    background: rgba(31, 41, 55, 0.9);
    border-color: rgba(55, 65, 81, 0.8);
}
[data-theme="dark"] .brand-panel {
    background: linear-gradient(145deg, rgba(17, 24, 39, 0.98), rgba(30, 58, 138, 0.6));
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea,
[data-theme="dark"] .search-box input {
    background: var(--light-color);
    color: var(--text-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .password-change-box {
    background: var(--surface-color);
}