:root {
            --primary: #0071e3;
            --primary-dark: #0056b3;
            --dark: #1d1d1f;
            --light: #f5f5f7;
            --gray: #86868b;
            --white: #ffffff;
            --transition: all 0.3s ease;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --radius: 12px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--white);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 16px;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            border: none;
        }

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

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

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

        .btn-secondary:hover {
            background-color: rgba(0, 113, 227, 0.1);
            transform: translateY(-2px);
        }

        .section {
            padding: 80px 0;
        }

        .section-title {
            font-size: 40px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 20px;
        }

        .section-subtitle {
            font-size: 20px;
            color: var(--gray);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 50px;
        }

        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            position: relative;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark);
            display: flex;
            align-items: center;
            z-index: 1001;
            flex-shrink: 0;
        }

        .logo i {
            color: var(--primary);
            margin-right: 8px;
        }

        .nav-links {
            display: flex;
            gap: 30px;
        }

        .nav-links a {
            font-weight: 500;
            transition: var(--transition);
            padding: 8px 0;
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-shrink: 0;
        }

        .nav-actions i {
            font-size: 20px;
            cursor: pointer;
            transition: var(--transition);
            padding: 8px;
        }

        .nav-actions i:hover {
            color: var(--primary);
        }

        .mobile-toggle {
            display: none;
            font-size: 24px;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
            flex-shrink: 0;
        }

        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            overflow: hidden;
            cursor: pointer;
            border: 2px solid var(--primary);
        }

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

        .user-avatar-placeholder {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            cursor: pointer;
            flex-shrink: 0;
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1100;
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            background-color: var(--white);
            border-radius: var(--radius);
            padding: 40px;
            width: 90%;
            max-width: 450px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            position: relative;
        }

        .close-modal {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 24px;
            cursor: pointer;
            color: var(--gray);
            padding: 5px;
            background: none;
            border: none;
        }

        .modal-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 10px;
            text-align: center;
        }

        .modal-subtitle {
            color: var(--gray);
            text-align: center;
            margin-bottom: 30px;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #d2d2d7;
            border-radius: 8px;
            font-size: 16px;
            transition: var(--transition);
        }

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

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .remember-me {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .forgot-password {
            color: var(--primary);
            font-size: 14px;
        }

        .modal-btn {
            width: 100%;
            padding: 14px;
            margin-bottom: 20px;
        }

        .divider {
            text-align: center;
            margin: 20px 0;
            position: relative;
        }

        .divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background-color: #d2d2d7;
        }

        .divider span {
            background-color: var(--white);
            padding: 0 15px;
            color: var(--gray);
        }

        .social-login {
            display: flex;
            gap: 15px;
        }

        .social-btn {
            flex: 1;
            padding: 12px;
            border: 1px solid #d2d2d7;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: var(--transition);
            text-decoration: none;
            color: inherit;
            background: white;
        }

        .social-btn:hover {
            background-color: #f5f5f7;
        }

        .signup-link {
            text-align: center;
            margin-top: 20px;
            color: var(--gray);
        }

        .signup-link a {
            color: var(--primary);
            font-weight: 500;
        }

        .user-dropdown {
            position: relative;
        }

        .user-menu {
            display: none;
            position: absolute;
            top: 100%;
            right: 0;
            background-color: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            width: 200px;
            padding: 10px 0;
            z-index: 100;
        }

        .user-menu.active {
            display: block;
        }

        .user-menu a {
            display: block;
            padding: 12px 20px;
            transition: var(--transition);
            text-decoration: none;
        }

        .user-menu a:hover {
            background-color: #f5f5f7;
        }

        .user-menu i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }

        .login-btn {
            display: flex;
            align-items: center;
            cursor: pointer;
            padding: 8px;
            flex-shrink: 0;
        }

        .login-btn i {
            font-size: 20px;
        }

        /* Search Modal */
        .search-modal {
            display: none;
        }

        .search-modal-content {
            background: var(--white);
            padding: 20px;
            border-radius: var(--radius);
            width: 90%;
            max-width: 600px;
            position: relative;
        }

        .search-input-group {
            display: flex;
            gap: 10px;
        }

        .search-input {
            flex: 1;
            padding: 15px 20px;
            border: 2px solid #d2d2d7;
            border-radius: 30px;
            font-size: 16px;
            outline: none;
        }

        .search-input:focus {
            border-color: var(--primary);
        }

        .search-btn {
            padding: 15px 25px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
        }

        .search-btn:hover {
            background: var(--primary-dark);
        }

        @media (max-width: 992px) {
            .nav-links {
                gap: 20px;
            }

            .nav-actions {
                gap: 15px;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 15px 0;
            }

            .mobile-toggle {
                display: block;
                order: 3;
            }

            .nav-links {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100vh;
                background-color: var(--white);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                padding: 30px 0;
                transform: translateX(-100%);
                opacity: 0;
                transition: var(--transition);
                z-index: 999;
            }

            .nav-links.active {
                transform: translateX(0);
                opacity: 1;
            }

            .nav-links li {
                margin: 15px 0;
            }

            .nav-links a {
                font-size: 18px;
                padding: 12px 20px;
                display: block;
                width: 100%;
                text-align: center;
            }

            .nav-actions {
                gap: 12px;
                margin-left: auto;
            }

            .section-title {
                font-size: 32px;
            }

            .section-subtitle {
                font-size: 18px;
            }

            .logo {
                font-size: 20px;
                order: 1;
            }

            .nav-actions {
                order: 2;
            }
        }

        @media (max-width: 576px) {
            .modal-content {
                padding: 30px 20px;
            }

            .social-login {
                flex-direction: column;
            }

            .search-modal-content {
                margin: 20px;
            }

            .nav-actions {
                gap: 8px;
            }

            .nav-actions i {
                padding: 6px;
                font-size: 18px;
            }

            .logo {
                font-size: 18px;
            }

            .user-avatar-placeholder,
            .login-btn {
                width: 32px;
                height: 32px;
            }

            .user-avatar-placeholder {
                font-size: 14px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }

            .nav-actions {
                gap: 6px;
            }

            .logo {
                font-size: 16px;
            }

            .logo i {
                margin-right: 4px;
            }
        }

        .search-modal {
            z-index: 1100;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.6);
            display: none;
            align-items: flex-start;
            justify-content: center;
            padding: 40px 20px;
            overflow-y: auto;
            backdrop-filter: blur(8px);
        }

        .search-modal .modal-content {
            background: var(--white);
            border-radius: 20px;
            padding: 0;
            width: 95%;
            max-width: 900px;
            height: auto;
            max-height: 85vh;
            display: flex;
            flex-direction: column;
            box-shadow: 0 32px 64px rgba(0, 0, 0, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.1);
            overflow: hidden;
        }

        .search-header {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 24px 30px;
            border-bottom: 1px solid #f0f0f0;
            background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
            flex-shrink: 0;
            position: sticky;
            top: 0;
            z-index: 10;
        }

        .search-input-container {
            flex: 1;
            position: relative;
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .search-icon {
            position: absolute;
            left: 18px;
            color: var(--primary);
            font-size: 18px;
            z-index: 2;
            transition: all 0.3s ease;
        }

        .search-input {
            width: 100%;
            padding: 18px 55px 18px 55px;
            border: 2px solid #e8e8e8;
            border-radius: 16px;
            font-size: 18px;
            background: var(--white);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            transition: all 0.3s ease;
            font-weight: 500;
            min-width: 0;
        }

        .search-input:focus {
            border-color: var(--primary);
            box-shadow: 0 8px 30px rgba(0, 113, 227, 0.15);
            outline: none;
            transform: translateY(-1px);
        }

        .search-input:focus+.search-icon {
            transform: scale(1.1);
            color: var(--primary-dark);
        }

        .clear-search {
            position: absolute;
            right: 15px;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border: none;
            color: #6c757d;
            cursor: pointer;
            padding: 10px;
            border-radius: 50%;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            font-size: 14px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            opacity: 0.8;
        }

        .clear-search:hover {
            background: linear-gradient(135deg, #e9ecef, #dee2e6);
            color: var(--dark);
            transform: scale(1.15) rotate(90deg);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            opacity: 1;
        }

        .clear-search:active {
            transform: scale(0.95) rotate(90deg);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
        }

        .close-search-modal {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border: none;
            color: white;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            padding: 12px 24px;
            border-radius: 12px;
            transition: all 0.3s ease;
            white-space: nowrap;
            flex-shrink: 0;
            box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
        }

        .close-search-modal:hover {
            background: linear-gradient(135deg, var(--primary-dark), #004a99);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
        }

        .close-search-modal:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(0, 113, 227, 0.3);
        }

        .search-results-container {
            flex: 1;
            overflow-y: auto;
            padding: 30px;
            min-height: 300px;
            -webkit-overflow-scrolling: touch;
            background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
        }

        .search-quick-categories {
            margin-bottom: 40px;
        }

        .search-quick-categories h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .search-quick-categories h4::before {
            content: "📱";
            font-size: 20px;
        }

        .quick-categories-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .quick-category {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            padding: 20px 15px;
            background: var(--white);
            border: 2px solid #f8f9fa;
            border-radius: 16px;
            cursor: pointer;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            text-align: center;
            min-height: 120px;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .quick-category::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 113, 227, 0.1), transparent);
            transition: left 0.6s ease;
        }

        .quick-category:hover {
            border-color: var(--primary);
            transform: translateY(-5px) scale(1.02);
            box-shadow: 0 12px 40px rgba(0, 113, 227, 0.15);
        }

        .quick-category:hover::before {
            left: 100%;
        }

        .category-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 20px;
            flex-shrink: 0;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
        }

        .quick-category:hover .category-icon {
            transform: scale(1.1) rotate(5deg);
            box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
        }

        .quick-category span {
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
            line-height: 1.4;
            transition: color 0.3s ease;
        }

        .quick-category:hover span {
            color: var(--primary);
        }

        .popular-searches {
            padding: 25px 30px;
            border-top: 1px solid #f0f0f0;
            background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
            flex-shrink: 0;
            position: sticky;
            bottom: 0;
            z-index: 10;
            border-radius: 0 0 20px 20px;
        }

        .popular-searches h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--gray);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .popular-searches h4::before {
            content: "🔥";
            font-size: 16px;
        }

        .popular-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .popular-tag {
            background: var(--white);
            border: 2px solid #e8e8e8;
            border-radius: 25px;
            padding: 10px 18px;
            font-size: 14px;
            color: var(--dark);
            cursor: pointer;
            transition: all 0.3s ease;
            white-space: nowrap;
            font-weight: 500;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .popular-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(0, 113, 227, 0.05);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 113, 227, 0.15);
        }

        @media (max-width: 1024px) {
            .search-modal {
                padding: 30px 15px;
            }

            .search-modal .modal-content {
                width: 95%;
                max-width: 800px;
                max-height: 90vh;
            }

            .quick-categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .search-header {
                padding: 20px 25px;
            }

            .search-results-container {
                padding: 25px;
            }

            .popular-searches {
                padding: 20px 25px;
            }
        }

        @media (max-width: 768px) {
            .search-modal {
                padding: 0;
                align-items: stretch;
            }

            .search-modal .modal-content {
                width: 100%;
                max-width: none;
                margin: 0;
                border-radius: 0;
                height: 100vh;
                max-height: none;
            }

            .search-header {
                padding: 20px;
                gap: 15px;
                position: relative;
            }

            .search-input {
                font-size: 17px;
                padding: 16px 50px 16px 50px;
            }

            .search-icon {
                left: 16px;
                font-size: 17px;
            }

            .clear-search {
                right: 12px;
                padding: 8px;
                width: 32px;
                height: 32px;
            }

            .close-search-modal span {
                display: none;
            }

            .close-search-modal::after {
                content: '✕';
                font-size: 18px;
                font-weight: 500;
            }

            .search-results-container {
                padding: 20px;
                flex: 1;
                overflow-y: auto;
            }

            .quick-categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }

            .quick-category {
                padding: 16px 12px;
                min-height: 100px;
            }

            .category-icon {
                width: 44px;
                height: 44px;
                font-size: 18px;
            }

            .quick-category span {
                font-size: 13px;
            }

            .popular-searches {
                padding: 20px;
                position: relative;
            }

            .popular-tags {
                gap: 8px;
            }

            .popular-tag {
                font-size: 13px;
                padding: 8px 16px;
            }
        }

        @media (max-width: 480px) {
            .search-header {
                padding: 16px;
                gap: 12px;
            }

            .search-input {
                font-size: 16px;
                padding: 14px 45px 14px 45px;
            }

            .search-icon {
                left: 14px;
                font-size: 16px;
            }

            .clear-search {
                right: 10px;
                padding: 7px;
                width: 30px;
                height: 30px;
                font-size: 13px;
            }

            .close-search-modal {
                padding: 10px 16px;
            }

            .search-results-container {
                padding: 16px;
            }

            .search-quick-categories h4 {
                font-size: 16px;
                margin-bottom: 16px;
            }

            .quick-categories-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .quick-category {
                flex-direction: row;
                text-align: left;
                padding: 16px;
                min-height: 80px;
                gap: 15px;
            }

            .category-icon {
                width: 40px;
                height: 40px;
                font-size: 16px;
            }

            .quick-category span {
                font-size: 14px;
            }

            .popular-searches {
                padding: 16px;
            }

            .popular-searches h4 {
                font-size: 14px;
            }

            .popular-tags {
                justify-content: center;
            }

            .popular-tag {
                font-size: 12px;
                padding: 8px 14px;
            }
        }

        @media (max-width: 360px) {
            .search-header {
                padding: 14px;
            }

            .search-input {
                font-size: 15px;
                padding: 12px 40px 12px 40px;
            }

            .search-results-container {
                padding: 14px;
            }

            .quick-category {
                padding: 14px;
            }

            .category-icon {
                width: 36px;
                height: 36px;
                font-size: 15px;
            }

            .quick-category span {
                font-size: 13px;
            }

            .popular-searches {
                padding: 14px;
            }
        }

        @media (max-height: 600px) {
            .search-modal .modal-content {
                max-height: 100vh;
            }

            .search-results-container {
                max-height: none;
                flex: 1;
            }

            .quick-categories-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .quick-category {
                min-height: 80px;
                padding: 12px;
            }

            .search-header,
            .popular-searches {
                position: relative;
            }
        }

        @media (max-width: 768px) {
            .search-input {
                font-size: 16px;
            }
        }

        .search-modal .modal-content {
            animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        @keyframes modalSlideIn {
            from {
                opacity: 0;
                transform: translateY(-30px) scale(0.95);
            }

            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .search-results-container::-webkit-scrollbar {
            width: 6px;
        }

        .search-results-container::-webkit-scrollbar-track {
            background: #f8f9fa;
            border-radius: 3px;
        }

        .search-results-container::-webkit-scrollbar-thumb {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 3px;
        }

        .search-results-container::-webkit-scrollbar-thumb:hover {
            background: linear-gradient(135deg, var(--primary-dark), #004a99);
        }

        .search-results-container {
            overscroll-behavior: contain;
        }

        @supports (-webkit-touch-callout: none) {
            .search-modal {
                -webkit-overflow-scrolling: touch;
            }

            .search-results-container {
                padding-bottom: env(safe-area-inset-bottom);
            }
        }

        @supports (padding: max(0px)) {
            .search-modal .modal-content {
                padding-left: max(0px, env(safe-area-inset-left));
                padding-right: max(0px, env(safe-area-inset-right));
            }

            .search-header,
            .search-results-container,
            .popular-searches {
                padding-left: max(20px, env(safe-area-inset-left));
                padding-right: max(20px, env(safe-area-inset-right));
            }
        }





        .alert {
            padding: 15px 20px;
            margin: 1.5rem 0 0 0;
            border-radius: 0;
            text-align: center;
            font-weight: 600;
            position: fixed;
            top: 80px;
            left: 0;
            right: 0;
            z-index: 9999;
        }

        .alert-success {
            background-color: #d4edda;
            color: #155724;
            border-bottom: 2px solid #c3e6cb;
        }

        .alert-danger {
            background-color: #f8d7da;
            color: #721c24;
            border-bottom: 2px solid #f5c6cb;
        }

        .demo-content {
            margin-top: 120px;
            padding: 40px 20px;
            text-align: center;
        }

        .demo-content h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--dark);
        }

        .demo-content p {
            font-size: 1.2rem;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto 30px;
        }