* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            transition: background-color 0.3s, color 0.3s, border-color 0.3s;
        }

        :root {
            --primary: #2563eb;
            --secondary: #10b981;
            --accent: #f59e0b;
            --danger: #ef4444;
            --warning: #f59e0b;
            --dark-bg: #0f172a;
            --dark-card: #1e293b;
            --dark-text: #f1f5f9;
            --dark-border: #334155;
            --light-bg: #f8fafc;
            --light-card: #ffffff;
            --light-text: #334155;
            --light-border: #e2e8f0;
        }

        [data-theme="dark"] {
            --bg-color: var(--dark-bg);
            --card-bg: var(--dark-card);
            --text-color: var(--dark-text);
            --border-color: var(--dark-border);
        }

        [data-theme="light"] {
            --bg-color: var(--light-bg);
            --card-bg: var(--light-card);
            --text-color: var(--light-text);
            --border-color: var(--light-border);
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* Header */
        header {
            background-color: var(--card-bg);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: bold;
        }

        .logo-primary {
            color: var(--primary);
        }

        .logo-secondary {
            color: var(--secondary);
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 25px;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 500;
            transition: color 0.3s;
            padding: 8px 16px;
            border-radius: 6px;
        }

        .nav-menu a:hover, .nav-menu a.active {
            background-color: var(--primary);
            color: white;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .theme-toggle {
            background: none;
            border: none;
            color: var(--text-color);
            font-size: 1.2rem;
            cursor: pointer;
            padding: 8px;
            border-radius: 50%;
            transition: background-color 0.3s;
        }

        .theme-toggle:hover {
            background-color: var(--border-color);
        }

        .btn {
            padding: 10px 20px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
        }

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

        .btn-primary:hover {
            background-color: #1d4ed8;
            transform: translateY(-2px);
        }

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

        .btn-success:hover {
            background-color: #059669;
            transform: translateY(-2px);
        }

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

        .btn-warning:hover {
            background-color: #d97706;
            transform: translateY(-2px);
        }

        .btn-danger {
            background-color: var(--danger);
            color: white;
            padding: 6px 12px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 0.8rem;
            transition: all 0.3s;
        }

        .btn-danger:hover {
            background-color: #dc2626;
        }

        /* Hero Section */
        .hero {
            padding: 150px 0 80px;
            background: linear-gradient(135deg, var(--primary), #1e40af);
            color: white;
            text-align: center;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
        }

        .hero p {
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }

        .action-buttons {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Items Grid */
        .items-section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 2.2rem;
            margin-bottom: 15px;
            color: var(--text-color);
        }

        .filters {
            display: flex;
            gap: 15px;
            justify-content: center;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .filter-btn {
            padding: 8px 20px;
            border: 2px solid var(--border-color);
            background: var(--card-bg);
            color: var(--text-color);
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .filter-btn.active, .filter-btn:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        .items-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 25px;
        }

        .item-card {
            background-color: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            transition: transform 0.3s;
            border-left: 4px solid var(--primary);
        }

        .item-card.found {
            border-left-color: var(--secondary);
        }

        .item-card.lost {
            border-left-color: var(--danger);
        }

        .item-card:hover {
            transform: translateY(-5px);
        }

        .item-image {
            width: 100%;
            height: 200px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 3rem;
            position: relative;
        }

        .item-status {
            position: absolute;
            top: 15px;
            right: 15px;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            color: white;
        }

        .status-lost {
            background-color: var(--danger);
        }

        .status-found {
            background-color: var(--secondary);
        }

        .item-content {
            padding: 20px;
        }

        .item-category {
            background-color: var(--primary);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 10px;
        }

        .item-title {
            font-size: 1.3rem;
            margin-bottom: 10px;
            color: var(--text-color);
        }

        .item-description {
            color: var(--text-color);
            opacity: 0.8;
            margin-bottom: 15px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* Delete Timer */
        .delete-timer {
            background: var(--bg-color);
            padding: 8px 12px;
            border-radius: 6px;
            margin: 10px 0;
            border-left: 3px solid var(--primary);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .delete-timer.warning {
            border-left-color: var(--warning);
        }

        .delete-timer.danger {
            border-left-color: var(--danger);
        }

        .item-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.9rem;
            color: var(--text-color);
            opacity: 0.7;
        }

        .item-location {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* Forms */
        .form-section {
            padding: 100px 0 80px;
            background-color: var(--bg-color);
        }

        .form-container {
            max-width: 600px;
            margin: 0 auto;
            background-color: var(--card-bg);
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        .form-title {
            text-align: center;
            margin-bottom: 30px;
            color: var(--text-color);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-color);
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            background-color: var(--bg-color);
            color: var(--text-color);
            font-size: 1rem;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
        }

        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        .image-preview {
            width: 100%;
            height: 200px;
            background-color: var(--bg-color);
            border: 2px dashed var(--border-color);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-color);
            margin-bottom: 15px;
            overflow: hidden;
        }

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

        /* Footer */
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-column h3 {
            margin-bottom: 20px;
            color: var(--primary);
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: white;
        }

        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #334155;
            color: #94a3b8;
        }

        /* Hidden elements */
        .hidden {
            display: none;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .items-grid {
                grid-template-columns: 1fr;
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .action-buttons .btn {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
        }