:root {
            --upxp-bg-dark: #0d0d0d;
            --upxp-bg-darker: #080808;
            --upxp-bg-light: #1a1a1a;
            --upxp-primary: #3cc30e;
            --upxp-primary-hover: #00ff1e;
            --upxp-primary-dark: #209c29;
            --upxp-purple: #c700ff;
            --upxp-text-white: #f0f0f0;
            --upxp-text-gray: #888;
            --upxp-text-muted: #555;
            --upxp-success: #10b981;
            --upxp-danger: #ef4444;
            --upxp-warning: #f59e0b;
            --upxp-info: #3b82f6;
            --upxp-border: #222;
            --upxp-transition: 0.2s ease;
            --upxp-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
            --upxp-control-h: 40px;
            --upxp-radius: 10px;
        }

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

        body {
            font-family: 'Inter', -apple-system, sans-serif;
            background-color: #000;
            color: var(--upxp-text-white);
        }

        /* ─── HEADER ─────────────────────────── */
        .upxp-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(8, 8, 8, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--upxp-border);
            box-shadow: var(--upxp-shadow);
        }

        .upxp-header-shell {
            width: 100%;
            max-width: 1760px;
            margin: 0 auto;
            padding: 8px 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: 10px;
            min-width: max-content;
        }

        /* ─── LOGO ───────────────────────────── */
        .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: 38px;
            height: 38px;
            border-radius: 50%;
            object-fit: cover;
            padding: 2px;
            background: linear-gradient(135deg, #3cc30e 0%, #00ff1e 50%, #209c29 100%);
            box-shadow: 0 0 12px rgba(60, 195, 14, 0.3);
            transition: transform var(--upxp-transition), box-shadow var(--upxp-transition);
        }

        .upxp-logo-image:hover {
            transform: scale(1.05);
            box-shadow: 0 0 18px rgba(60, 195, 14, 0.5);
        }

        /* ─── NAV BUTTONS ────────────────────── */
        .upxp-nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .upxp-nav-btn {
            height: var(--upxp-control-h);
            display: inline-flex !important;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 0 14px !important;
            border-radius: var(--upxp-radius);
            border: 1px solid var(--upxp-border);
            background: var(--upxp-bg-dark);
            color: var(--upxp-text-white);
            text-decoration: none;
            font-size: 13px;
            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, 0.45);
            color: var(--upxp-primary);
            background: #111;
        }

        .upxp-nav-btn i {
            color: var(--upxp-primary);
            font-size: 13px;
        }

        /* ─── SEARCH ─────────────────────────── */
        .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: 14px;
            color: var(--upxp-primary);
            font-size: 13px;
            opacity: 0.7;
            pointer-events: none;
        }

        .upxp-search-input {
            width: 100%;
            height: var(--upxp-control-h);
            border-radius: 999px;
            border: 1px solid var(--upxp-border);
            background: var(--upxp-bg-dark);
            color: var(--upxp-text-white);
            padding: 0 16px 0 40px;
            font-size: 16px !important;
            font-family: 'Inter', 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, 0.1);
        }

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

        /* ─── SEARCH RESULTS ─────────────────── */
        .upxp-search-results {
            position: absolute;
            top: calc(100% + 6px);
            left: 0;
            right: 0;
            background-color: #0a0a0a;
            border: 1px solid var(--upxp-border);
            border-radius: var(--upxp-radius);
            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: 5px;
        }

        .upxp-search-results::-webkit-scrollbar-thumb {
            background: #2a2a2a;
            border-radius: 5px;
        }

        .upxp-search-category {
            padding: 10px 14px 6px;
            font-size: 10px;
            font-weight: 700;
            color: var(--upxp-text-gray);
            text-transform: uppercase;
            letter-spacing: 0.8px;
            border-top: 1px solid var(--upxp-border);
        }

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

        .upxp-search-item {
            padding: 8px 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: #151515;
        }

        .upxp-search-item-image {
            width: 42px;
            height: 42px;
            border-radius: 8px;
            object-fit: cover;
            border: 1px solid var(--upxp-border);
            background: #111;
            flex-shrink: 0;
        }

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

        .upxp-search-item-title {
            font-size: 13px;
            font-weight: 500;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .upxp-search-item-subtitle {
            font-size: 11px;
            font-weight: 600;
            color: var(--upxp-primary);
            margin-top: 1px;
        }

        .upxp-search-no-results {
            padding: 20px 14px;
            font-size: 13px;
            text-align: center;
            color: var(--upxp-text-gray);
        }

        /* ─── RIGHT SECTION ──────────────────── */
        .upxp-right-section {
            height: var(--upxp-control-h);
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 6px;
            min-width: max-content;
        }

        .upxp-language-switcher {
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 0 10px;
            border-radius: var(--upxp-radius);
            border: 1px solid var(--upxp-border);
            background: var(--upxp-bg-dark);
        }

        .upxp-language-label {
            font-size: 11px;
            color: var(--upxp-text-gray);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.6px;
        }

        .upxp-language-select {
            height: calc(var(--upxp-control-h) - 10px);
            border-radius: 8px;
            border: 1px solid var(--upxp-border);
            background: #111;
            color: var(--upxp-text-white);
            font-size: 12px;
            font-weight: 600;
            padding: 0 8px;
            cursor: pointer;
        }

        .upxp-language-select:focus {
            outline: none;
            border-color: var(--upxp-primary);
        }

        /* ─── NOTIFICATIONS ──────────────────── */
        .upxp-notification-icons {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .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-gray);
            text-decoration: none;
            position: relative;
            font-size: 15px;
            transition: all var(--upxp-transition);
        }

        .upxp-notification-link:hover {
            border-color: var(--upxp-border);
            background: #111;
            color: var(--upxp-primary);
        }

        .upxp-notification-badge {
            position: absolute;
            top: 2px;
            right: 2px;
            min-width: 16px;
            height: 16px;
            border-radius: 99px;
            padding: 0 4px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            background: var(--upxp-danger);
        }

        .upxp-order-badge { background: var(--upxp-warning); color: #000; }
        .upxp-seller-badge { background: var(--upxp-info); }
        .upxp-questions-badge { background: var(--upxp-primary-dark); }

        /* ─── USER MENU ──────────────────────── */
        .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: 8px;
            padding: 0 10px;
            border-radius: 999px;
            border: 1px solid var(--upxp-border);
            background: var(--upxp-bg-dark);
            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, 0.4);
            background: #111;
        }

        .upxp-user-avatar img {
            width: 26px;
            height: 26px;
            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: 12px;
            font-weight: 600;
            color: var(--upxp-text-white);
            max-width: 110px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .upxp-user-balance {
            display: block;
            font-size: 12px;
            font-weight: 700;
            line-height: 1.2;
            color: #8fff6b;
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            text-shadow: 0 1px 0 rgba(0, 0, 0, 0.55);
        }

        .upxp-user-avatar > .fa-chevron-down {
            font-size: 10px;
            color: var(--upxp-text-gray);
        }

        .upxp-user-verified::after {
            content: '✓';
            position: absolute;
            right: 24px;
            bottom: 3px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--upxp-success);
            border: 2px solid #0d0d0d;
            font-size: 8px;
            font-weight: 700;
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        /* ─── DROPDOWN ───────────────────────── */
        .upxp-dropdown-menu {
            position: absolute;
            top: calc(100% + 6px);
            right: 0;
            min-width: 230px;
            border-radius: var(--upxp-radius);
            border: 1px solid var(--upxp-border);
            background: #0a0a0a;
            box-shadow: var(--upxp-shadow);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-6px);
            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: 6px;
        }

        .upxp-dropdown-menu a {
            display: flex;
            align-items: center;
            gap: 10px;
            border-radius: 8px;
            padding: 9px 12px;
            color: var(--upxp-text-white);
            text-decoration: none;
            font-size: 13px;
            transition: background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-dropdown-menu a i {
            width: 16px;
            text-align: center;
            color: var(--upxp-text-gray);
            font-size: 13px;
        }

        .upxp-dropdown-menu a:hover {
            background: #151515;
            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: 6px 0;
        }

        .upxp-signout { color: var(--upxp-danger) !important; }
        .upxp-signout:hover { background: rgba(239, 68, 68, 0.1) !important; }

        /* ─── AUTH BUTTONS ────────────────────── */
        .upxp-auth-buttons {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .upxp-btn {
            height: var(--upxp-control-h);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0 14px;
            border-radius: var(--upxp-radius);
            font-size: 12px;
            font-weight: 600;
            text-decoration: none;
            border: 1px solid var(--upxp-border);
            transition: all var(--upxp-transition);
        }

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

        .upxp-btn-signin:hover {
            border-color: rgba(60, 195, 14, 0.4);
            color: var(--upxp-primary);
            background: #111;
        }

        .upxp-btn-signup {
            color: #000;
            border-color: var(--upxp-primary);
            background: var(--upxp-primary);
            font-weight: 700;
        }

        .upxp-btn-signup:hover {
            background: var(--upxp-primary-hover);
            border-color: var(--upxp-primary-hover);
            box-shadow: 0 0 15px rgba(60, 195, 14, 0.3);
        }

        /* ─── MOBILE HIDDEN BY DEFAULT ───────── */
        .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: var(--upxp-bg-dark);
            padding: 10px;
            gap: 4px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .upxp-mobile-menu-btn span {
            width: 16px;
            height: 2px;
            border-radius: 2px;
            background: #fff;
            transition: transform var(--upxp-transition), opacity var(--upxp-transition);
        }

        /* ─── MOBILE MENU ────────────────────── */
        .upxp-mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: min(340px, 90vw);
            height: 100vh;
            height: 100dvh;
            z-index: 2000;
            background: #080808;
            border-left: 1px solid var(--upxp-border);
            box-shadow: -8px 0 30px rgba(0, 0, 0, 0.6);
            transition: right 0.25s ease;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
            overflow-y: hidden;
        }

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

        .upxp-mobile-menu-header {
            height: 60px;
            padding: 10px 14px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--upxp-border);
            background: #0a0a0a;
            flex-shrink: 0;
        }

        .upxp-mobile-close {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            border: 1px solid var(--upxp-border);
            background: #111;
            color: #fff;
            font-size: 16px;
            cursor: pointer;
            transition: all var(--upxp-transition);
        }

        .upxp-mobile-close:hover {
            border-color: var(--upxp-danger);
            color: var(--upxp-danger);
        }

        .upxp-mobile-search {
            padding: 12px 14px;
            border-bottom: 1px solid var(--upxp-border);
            flex-shrink: 0;
        }

        .upxp-mobile-menu-content {
            padding: 10px;
            flex: 1 1 0%;
            min-height: 0;
            overflow-y: auto;
            overflow-x: hidden;
            -webkit-overflow-scrolling: touch;
            overscroll-behavior-y: contain;
            touch-action: pan-y;
            scrollbar-width: thin;
            scrollbar-color: #2a2a2a transparent;
        }

        .upxp-mobile-menu-content::-webkit-scrollbar {
            width: 4px;
        }

        .upxp-mobile-menu-content::-webkit-scrollbar-track {
            background: transparent;
        }

        .upxp-mobile-menu-content::-webkit-scrollbar-thumb {
            background: #2a2a2a;
            border-radius: 4px;
        }

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

        .upxp-mobile-nav li + li {
            margin-top: 2px;
        }

        .upxp-mobile-nav a {
            min-height: 40px;
            border-radius: 8px;
            padding: 9px 12px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--upxp-text-white);
            text-decoration: none;
            font-size: 13px;
            transition: background var(--upxp-transition), color var(--upxp-transition);
        }

        .upxp-mobile-nav a i {
            width: 16px;
            text-align: center;
            color: var(--upxp-text-gray);
            font-size: 13px;
        }

        .upxp-mobile-nav a:hover {
            background: #151515;
            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: 18px;
            height: 16px;
            border-radius: 20px;
            padding: 0 5px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            background: var(--upxp-danger);
        }

        .upxp-mobile-divider {
            border: 0;
            border-top: 1px solid var(--upxp-border);
            margin: 8px 4px;
        }

        .upxp-mobile-btn {
            justify-content: center;
            font-weight: 700;
            margin-top: 4px;
        }

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

        .upxp-mobile-btn-primary {
            border: 1px solid var(--upxp-primary);
            color: #000;
            background: var(--upxp-primary);
            font-weight: 700;
        }

        .upxp-mobile-signout {
            color: var(--upxp-danger) !important;
        }

        .upxp-mobile-signout:hover {
            background: rgba(239, 68, 68, 0.1) !important;
        }

        .upxp-mobile-signout i {
            color: var(--upxp-danger) !important;
        }

        .upxp-mobile-language-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            padding: 9px 12px;
        }

        .upxp-mobile-language-label {
            font-size: 12px;
            font-weight: 600;
            color: var(--upxp-text-white);
        }

        .upxp-language-select-mobile {
            min-width: 88px;
        }

        /* ─── RESPONSIVE ─────────────────────── */
        @media (max-width: 1320px) {
            .upxp-header-shell {
                grid-template-columns: auto minmax(280px, 1fr) auto;
                padding: 8px 14px;
            }

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

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

            .upxp-user-name {
                max-width: 85px;
            }
        }

        @media (max-width: 1024px) {
            .upxp-header-shell {
                display: flex;
                flex-wrap: wrap;
                align-items: center;
                gap: 6px;
                padding: 8px 10px;
            }

            .upxp-header-left {
                gap: 6px;
                min-width: 0;
            }

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

            .upxp-language-label {
                display: none;
            }

            .upxp-nav-mobile-icons {
                display: flex;
                align-items: center;
                gap: 4px;
            }

            .upxp-nav-mobile-icon {
                width: var(--upxp-control-h);
                height: var(--upxp-control-h);
                border-radius: 10px;
                border: 1px solid var(--upxp-border);
                background: var(--upxp-bg-dark);
                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: 13px;
            }

            .upxp-right-section {
                margin-left: auto;
                gap: 4px;
            }

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

            .upxp-btn-mobile {
                height: var(--upxp-control-h);
                padding: 0 10px;
                font-size: 11px;
            }

            .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: 36px;
                --upxp-radius: 8px;
            }

            .upxp-header-shell {
                padding: 6px 8px;
                gap: 5px;
            }

            .upxp-notification-link {
                width: 36px;
                height: 36px;
                font-size: 14px;
            }

            .upxp-btn-mobile {
                padding: 0 8px;
                font-size: 10px;
            }

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

            .upxp-logo-image {
                width: 34px;
                height: 34px;
            }
        }

        @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);
        }