:root {
            --upxp-bg-dark: #1a1a1f;
            --upxp-bg-darker: #151519;
            --upxp-bg-light: #23232b;
            --upxp-primary: #3cc30e;
            --upxp-primary-hover: #00ff1e;
            --upxp-primary-dark: #209c29;
            --upxp-text-white: #ffffff;
            --upxp-text-gray: #9b9ba1;
            --upxp-text-muted: #6f6f78;
            --upxp-success: #34a853;
            --upxp-danger: #ea4335;
            --upxp-warning: #fbbc05;
            --upxp-info: #4285f4;
            --upxp-border: #2f2f38;
            --upxp-transition: 0.2s ease;
            --upxp-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
            --upxp-control-h: 42px;
            --upxp-radius: 12px;
        }

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

        body {
            font-family: 'Poppins', 'Inter', sans-serif;
            background-color: #0f0f12;
            color: var(--upxp-text-white);
        }

        .upxp-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: linear-gradient(180deg, #1b1b22 0%, #17171d 100%);
            border-bottom: 1px solid var(--upxp-border);
            box-shadow: var(--upxp-shadow);
        }

        .upxp-header-shell {
            width: 100%;
            max-width: 1760px;
            margin: 0 auto;
            padding: 10px 18px;
            display: grid;
            grid-template-columns: auto minmax(360px, 1fr) auto;
            align-items: center;
            gap: 14px;
        }

        .upxp-header-left {
            display: flex;
            align-items: center;
            gap: 12px;
            min-width: max-content;
        }

        .upxp-logo {
            width: var(--upxp-control-h);
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .upxp-logo-image {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            padding: 3px;
            background: linear-gradient(135deg, #3cc30e 0%, #00ff1e 50%, #209c29 100%);
            box-shadow: 0 2px 10px rgba(60, 195, 14, 0.35);
            transition: transform var(--upxp-transition), box-shadow var(--upxp-transition);
        }

        .upxp-logo-image:hover {
            transform: scale(1.03);
            box-shadow: 0 4px 14px rgba(60, 195, 14, 0.45);
        }

        .upxp-nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .upxp-nav-btn {
            height: var(--upxp-control-h);
            display: inline-flex !important;
            align-items: center;
            justify-content: center;
            gap: 7px;
            padding: 0 16px !important;
            border-radius: var(--upxp-radius);
            border: 1px solid var(--upxp-border);
            background: linear-gradient(180deg, #22222a 0%, #1d1d24 100%);
            color: var(--upxp-text-white);
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: border-color var(--upxp-transition), color var(--upxp-transition), background var(--upxp-transition);
        }

        .upxp-nav-btn:hover {
            border-color: rgba(60, 195, 14, 0.5);
            color: var(--upxp-primary-hover);
            background: linear-gradient(180deg, #252530 0%, #20202a 100%);
        }

        .upxp-nav-btn i {
            color: var(--upxp-primary);
            font-size: 14px;
        }

        .upxp-search-container {
            position: relative;
            min-width: 280px;
            width: clamp(360px, 40vw, 620px);
            max-width: 100%;
            justify-self: center;
        }

        .upxp-search-wrapper {
            position: relative;
            height: var(--upxp-control-h);
            display: flex;
            align-items: center;
        }

        .upxp-search-icon {
            position: absolute;
            left: 16px;
            color: var(--upxp-primary);
            font-size: 14px;
            opacity: 0.8;
            pointer-events: none;
        }

        .upxp-search-input {
            width: 100%;
            height: var(--upxp-control-h);
            border-radius: 999px;
            border: 1px solid rgba(60, 195, 14, 0.35);
            background: linear-gradient(180deg, #22222a 0%, #1b1b21 100%);
            color: var(--upxp-text-white);
            padding: 0 18px 0 44px;
            font-size: 16px !important;
            font-family: 'Poppins', sans-serif;
            line-height: var(--upxp-control-h);
            transition: border-color var(--upxp-transition), box-shadow var(--upxp-transition);
        }

        .upxp-search-input:focus {
            outline: none;
            border-color: var(--upxp-primary);
            box-shadow: 0 0 0 3px rgba(60, 195, 14, 0.12);
        }

        .upxp-search-input::placeholder {
            color: var(--upxp-text-muted);
        }

        .upxp-search-results {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            right: 0;
            background-color: var(--upxp-bg-darker);
            border: 1px solid var(--upxp-border);
            border-radius: 12px;
            max-height: 400px;
            overflow-y: auto;
            display: none;
            box-shadow: var(--upxp-shadow);
            z-index: 1010;
        }

        .upxp-search-results.active {
            display: block;
        }

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

        .upxp-search-results::-webkit-scrollbar-thumb {
            background: #3a3a44;
            border-radius: 6px;
        }

        .upxp-search-category {
            padding: 12px 16px 8px;
            font-size: 11px;
            font-weight: 700;
            color: var(--upxp-text-gray);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border-top: 1px solid var(--upxp-border);
        }

        .upxp-search-category:first-child {
            border-top: 0;
        }

        .upxp-search-item {
            padding: 10px 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--upxp-text-white);
            text-decoration: none;
            transition: background var(--upxp-transition);
        }

        .upxp-search-item:hover {
            background: #21212a;
        }

        .upxp-search-item-image {
            width: 46px;
            height: 46px;
            border-radius: 10px;
            object-fit: cover;
            border: 1px solid #3a2f54;
            background: radial-gradient(circle at 30% 30%, rgba(200, 100, 255, 0.3) 0%, transparent 50%), radial-gradient(circle at 70% 70%, rgba(138, 43, 226, 0.3) 0%, transparent 50%), radial-gradient(circle at center, rgba(138, 43, 226, 0.5) 0%, rgba(75, 0, 130, 0.7) 50%, rgba(30, 0, 60, 0.9) 100%);
            flex-shrink: 0;
        }

        .upxp-search-item-info {
            flex: 1;
            min-width: 0;
        }

        .upxp-search-item-title {
            font-size: 14px;
            font-weight: 500;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .upxp-search-item-subtitle {
            font-size: 12px;
            font-weight: 600;
            color: var(--upxp-primary-hover);
            margin-top: 1px;
        }

        .upxp-search-no-results {
            padding: 24px 18px;
            font-size: 14px;
            text-align: center;
            color: var(--upxp-text-gray);
        }

        .upxp-right-section {
            height: var(--upxp-control-h);
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 8px;
            min-width: max-content;
        }

        .upxp-notification-icons {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .upxp-notification-link {
            width: var(--upxp-control-h);
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            border: 1px solid transparent;
            color: var(--upxp-text-white);
            text-decoration: none;
            position: relative;
            font-size: 16px;
            transition: border-color var(--upxp-transition), background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-notification-link:hover {
            border-color: var(--upxp-border);
            background: #21212a;
            color: var(--upxp-primary);
        }

        .upxp-notification-badge {
            position: absolute;
            top: 2px;
            right: 2px;
            min-width: 18px;
            height: 16px;
            border-radius: 99px;
            padding: 0 4px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            font-weight: 700;
            color: #fff;
            background: var(--upxp-danger);
        }

        .upxp-order-badge { background: var(--upxp-warning); }
        .upxp-seller-badge { background: var(--upxp-info); }
        .upxp-questions-badge { background: var(--upxp-primary-dark); }

        .upxp-user-menu {
            position: relative;
            height: var(--upxp-control-h);
            display: flex;
            align-items: center;
        }

        .upxp-user-avatar {
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 0 12px;
            border-radius: 999px;
            border: 1px solid var(--upxp-border);
            background: linear-gradient(180deg, #22222a 0%, #1c1c24 100%);
            color: var(--upxp-text-white);
            font-family: inherit;
            cursor: pointer;
            position: relative;
            transition: border-color var(--upxp-transition), background var(--upxp-transition);
        }

        .upxp-user-avatar:hover {
            border-color: rgba(60, 195, 14, 0.45);
            background: linear-gradient(180deg, #252530 0%, #1f1f28 100%);
        }

        .upxp-user-avatar img {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
        }

        .upxp-user-info {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            line-height: 1.15;
            min-width: 0;
        }

        .upxp-user-name {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--upxp-text-white);
            max-width: 120px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .upxp-user-balance {
            display: block;
            font-size: 12px;
            font-weight: 600;
            color: var(--upxp-primary);
        }

        .upxp-user-avatar > .fa-chevron-down {
            font-size: 11px;
            color: var(--upxp-text-gray);
        }

        .upxp-user-verified::after {
            content: '✓';
            position: absolute;
            right: 26px;
            bottom: 4px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--upxp-success);
            border: 2px solid #1b1b22;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .upxp-dropdown-menu {
            position: absolute;
            top: calc(100% + 8px);
            right: 0;
            min-width: 240px;
            border-radius: 12px;
            border: 1px solid var(--upxp-border);
            background: #181820;
            box-shadow: var(--upxp-shadow);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-8px);
            transition: opacity var(--upxp-transition), visibility var(--upxp-transition), transform var(--upxp-transition);
            z-index: 1020;
        }

        .upxp-user-menu:hover .upxp-dropdown-menu,
        .upxp-user-menu:focus-within .upxp-dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .upxp-dropdown-menu ul {
            list-style: none;
            padding: 8px;
        }

        .upxp-dropdown-menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            border-radius: 8px;
            padding: 10px 12px;
            color: var(--upxp-text-white);
            text-decoration: none;
            font-size: 14px;
            transition: background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-dropdown-menu a i {
            width: 18px;
            text-align: center;
            color: var(--upxp-text-gray);
        }

        .upxp-dropdown-menu a:hover {
            background: #23232b;
            color: var(--upxp-primary);
        }

        .upxp-dropdown-menu a:hover i {
            color: var(--upxp-primary);
        }

        .upxp-dropdown-divider {
            border: 0;
            border-top: 1px solid var(--upxp-border);
            margin: 8px 0;
        }

        .upxp-signout { color: var(--upxp-danger) !important; }
        .upxp-signout:hover { background: rgba(234, 67, 53, 0.12) !important; }

        .upxp-auth-buttons {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .upxp-btn {
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0 16px;
            border-radius: var(--upxp-radius);
            font-size: 13px;
            font-weight: 600;
            text-decoration: none;
            border: 1px solid var(--upxp-border);
            transition: border-color var(--upxp-transition), background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-btn-signin {
            color: var(--upxp-text-white);
            background: transparent;
        }

        .upxp-btn-signin:hover {
            border-color: rgba(60, 195, 14, 0.5);
            color: var(--upxp-primary-hover);
            background: #21212a;
        }

        .upxp-btn-signup {
            color: #fff;
            border-color: #2b8f31;
            background: linear-gradient(180deg, #2ca834 0%, #228f2a 100%);
        }

        .upxp-btn-signup:hover {
            background: linear-gradient(180deg, #31b83a 0%, #269f2f 100%);
            border-color: #31b83a;
        }

        .upxp-auth-buttons-mobile,
        .upxp-nav-mobile-icons,
        .upxp-mobile-menu-btn {
            display: none;
        }

        .upxp-mobile-menu-btn {
            width: var(--upxp-control-h);
            height: var(--upxp-control-h);
            border-radius: 10px;
            border: 1px solid var(--upxp-border);
            background: linear-gradient(180deg, #23232b 0%, #1d1d25 100%);
            padding: 10px;
            gap: 4px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .upxp-mobile-menu-btn span {
            width: 18px;
            height: 2px;
            border-radius: 2px;
            background: #fff;
            transition: transform var(--upxp-transition), opacity var(--upxp-transition);
        }

        .upxp-mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: min(360px, 92vw);
            height: 100vh;
            z-index: 2000;
            background: #181820;
            border-left: 1px solid var(--upxp-border);
            box-shadow: -12px 0 26px rgba(0, 0, 0, 0.4);
            transition: right 0.25s ease;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .upxp-mobile-menu.active {
            right: 0;
        }

        .upxp-mobile-menu-header {
            height: 72px;
            padding: 14px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--upxp-border);
            background: #1d1d24;
        }

        .upxp-mobile-close {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            border: 1px solid var(--upxp-border);
            background: #24242d;
            color: #fff;
            font-size: 18px;
            cursor: pointer;
        }

        .upxp-mobile-search {
            padding: 14px;
            border-bottom: 1px solid var(--upxp-border);
        }

        .upxp-mobile-menu-content {
            padding: 12px;
            flex: 1;
            min-height: 0;
            overflow-y: auto;
            -webkit-overflow-scrolling: touch;
            overscroll-behavior: contain;
            touch-action: pan-y;
        }

        .upxp-mobile-nav {
            list-style: none;
        }

        .upxp-mobile-nav li + li {
            margin-top: 4px;
        }

        .upxp-mobile-nav a {
            min-height: 42px;
            border-radius: 10px;
            padding: 10px 12px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--upxp-text-white);
            text-decoration: none;
            transition: background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-mobile-nav a i {
            width: 18px;
            text-align: center;
            color: var(--upxp-text-gray);
        }

        .upxp-mobile-nav a:hover {
            background: #23232b;
            color: var(--upxp-primary);
        }

        .upxp-mobile-nav a:hover i {
            color: var(--upxp-primary);
        }

        .upxp-mobile-notification-link {
            position: relative;
        }

        .upxp-mobile-notification-badge {
            margin-left: auto;
            min-width: 20px;
            height: 18px;
            border-radius: 20px;
            padding: 0 6px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 10px;
            font-weight: 700;
            color: #fff;
            background: var(--upxp-danger);
        }

        .upxp-mobile-divider {
            border: 0;
            border-top: 1px solid var(--upxp-border);
            margin: 10px 4px;
        }

        .upxp-mobile-btn {
            justify-content: center;
            font-weight: 700;
            margin-top: 6px;
        }

        .upxp-mobile-btn-outline {
            border: 1px solid var(--upxp-border);
            color: var(--upxp-text-white);
            background: transparent;
        }

        .upxp-mobile-btn-primary {
            border: 1px solid #2b8f31;
            color: #fff;
            background: linear-gradient(180deg, #2ca834 0%, #228f2a 100%);
        }

        @media (max-width: 1320px) {
            .upxp-header-shell {
                grid-template-columns: auto minmax(280px, 1fr) auto;
                padding: 10px 14px;
            }

            .upxp-search-container {
                width: clamp(320px, 38vw, 540px);
            }

            .upxp-nav-btn {
                padding: 0 12px !important;
                font-size: 13px;
            }

            .upxp-user-name {
                max-width: 90px;
            }
        }

        @media (max-width: 1024px) {
            .upxp-header-shell {
                display: flex;
                flex-wrap: wrap;
                align-items: center;
                gap: 8px;
                padding: 10px 10px;
            }

            .upxp-header-left {
                gap: 8px;
                min-width: 0;
            }

            .upxp-nav-desktop,
            .upxp-auth-buttons-desktop,
            .upxp-user-menu {
                display: none;
            }

            .upxp-nav-mobile-icons {
                display: flex;
                align-items: center;
                gap: 6px;
            }

            .upxp-nav-mobile-icon {
                width: var(--upxp-control-h);
                height: var(--upxp-control-h);
                border-radius: 10px;
                border: 1px solid var(--upxp-border);
                background: #21212a;
                color: var(--upxp-text-white);
                display: inline-flex;
                align-items: center;
                justify-content: center;
                text-decoration: none;
            }

            .upxp-nav-mobile-icon i {
                color: var(--upxp-primary);
                font-size: 14px;
            }

            .upxp-right-section {
                margin-left: auto;
                gap: 6px;
            }

            .upxp-auth-buttons-mobile {
                display: flex;
            }

            .upxp-btn-mobile {
                height: var(--upxp-control-h);
                padding: 0 12px;
                font-size: 12px;
            }

            .upxp-mobile-menu-btn {
                display: inline-flex;
            }

            .upxp-search-container {
                order: 10;
                width: 100%;
                min-width: 0;
            }
        }

        @media (max-width: 640px) {
            :root {
                --upxp-control-h: 38px;
                --upxp-radius: 10px;
            }

            .upxp-header-shell {
                padding: 8px;
                gap: 6px;
            }

            .upxp-notification-link {
                width: 38px;
                height: 38px;
                font-size: 15px;
            }

            .upxp-btn-mobile {
                padding: 0 10px;
                font-size: 11px;
            }

            .upxp-search-input {
                font-size: 16px !important;
            }
        }

        @media (min-width: 1025px) {
            .upxp-mobile-menu {
                display: none !important;
            }
        }

        .upxp-mobile-menu-btn.active span:nth-child(1) {
            transform: rotate(45deg) translate(4px, 4px);
        }

        .upxp-mobile-menu-btn.active span:nth-child(2) {
            opacity: 0;
        }

        .upxp-mobile-menu-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translate(4px, -4px);
        }