/* ===== 全局重置 & 基础 ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #fe6b03;
            --primary-dark: #d85a02;
            --secondary: #3a9f22;
            --secondary-dark: #2d7d1a;
            --bg-light: #f8f9fa;
            --bg-dark: #1a1a1a;
            --text-dark: #222;
            --text-light: #fff;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.10);
            --radius: 10px;
            --transition: 0.3s ease;
            --font-base: clamp(14px, 1.2vw, 20px);
            --nav-height: 72px;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Segoe UI', 'PingFang SC', Roboto, 'Helvetica Neue', sans-serif;
            font-size: var(--font-base);
            background: #f0f2f5;
            color: var(--text-dark);
            line-height: 1.6;
            padding-top: var(--nav-height);
        }

        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }
        ul {
            list-style: none;
        }

        .container {
            width: 80%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== 顶部导航 (带二级菜单) ===== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: #ffffff;
            color: #333;
            padding: 0 20px;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            border-bottom: 1px solid #eee;
        }

        .navbar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: clamp(18px, 1.8vw, 28px);
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
            flex: 0 0 auto;
            width: 180px;
        }
        .navbar .logo i {
            font-size: clamp(22px, 2vw, 32px);
            color: var(--primary);
        }
        .navbar .logo span {
            color: var(--primary);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            flex: 1;
            justify-content: center;
        }
        .nav-menu > ul {
            display: flex;
            align-items: center;
            gap: clamp(40px, 1.2vw, 28px);
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-menu > ul > li {
            position: relative;
            white-space: nowrap;
        }
        .nav-menu > ul > li > a {
            color: #555;
            padding: 6px 0;
            border-bottom: 3px solid transparent;
            transition: var(--transition);
            font-size: clamp(13px, 1.1vw, 17px);
            display: inline-block;
        }
        .nav-menu > ul > li > a:hover,
        .nav-menu > ul > li > a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .dropdown-toggle {
            background: none;
            border: none;
            color: #555;
            font-size: clamp(11px, 0.8vw, 14px);
            cursor: pointer;
            padding: 0 4px;
            transition: var(--transition);
            vertical-align: middle;
        }
        .dropdown-toggle:hover {
            color: var(--primary);
        }
        .dropdown-toggle .fa-chevron-down {
            transition: transform 0.3s ease;
        }
        .has-dropdown.open .dropdown-toggle .fa-chevron-down {
            transform: rotate(180deg);
        }

        .dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            background: #fff;
            min-width: 180px;
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
            border-radius: 8px;
            padding: 8px 0;
            border: 1px solid #eee;
            z-index: 100;
            flex-direction: column;
            gap: 0;
        }
        .dropdown-menu li {
            white-space: nowrap;
        }
        .dropdown-menu li a {
            display: block;
            padding: 8px 20px;
            color: #555;
            font-size: clamp(13px, 0.9vw, 15px);
            transition: var(--transition);
        }
        .dropdown-menu li a:hover {
            background: var(--primary);
            color: #fff;
        }

        @media (min-width: 769px) {
            .has-dropdown:hover .dropdown-menu {
                display: flex;
            }
            .has-dropdown:hover .dropdown-toggle .fa-chevron-down {
                transform: rotate(180deg);
            }
        }

        .has-dropdown.open .dropdown-menu {
            display: flex;
        }

        .nav-cta-wrapper {
            flex: 0 0 auto;
            width: 180px;
            display: flex;
            justify-content: flex-end;
        }
        .nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 8px 20px !important;
            border-radius: 30px;
            font-weight: 600;
            border: none !important;
            transition: var(--transition);
            font-size: clamp(13px, 1vw, 16px);
            cursor: pointer;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(254, 107, 3, 0.30);
            color: #fff !important;
            border-bottom-color: transparent !important;
        }
        .nav-cta i {
            font-size: 0.9em;
        }

        .menu-toggle {
            display: none;
            font-size: 28px;
            color: #333;
            cursor: pointer;
            background: none;
            border: none;
            padding: 4px 8px;
            flex: 0 0 auto;
            align-items: center;
            justify-content: center;
        }

        /* ===== 页面Banner ===== */
        .page-banner {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            padding: 30px 20px 24px;
            margin-bottom: 30px;
            border-radius: 0 0 20px 20px;
        }
        .page-banner .breadcrumb {
            font-size: clamp(14px, 1vw, 18px);
            opacity: 0.9;
            margin-bottom: 6px;
        }
        .page-banner .breadcrumb a {
            color: #fff;
            text-decoration: underline;
        }
        .page-banner .breadcrumb a:hover {
            opacity: 0.8;
        }
        .page-banner h1 {
            font-size: clamp(26px, 3vw, 44px);
            font-weight: 700;
            letter-spacing: 2px;
        }
        .page-banner p {
            font-size: clamp(15px, 1.2vw, 20px);
            opacity: 0.9;
            margin-top: 4px;
        }

        /* ===== 栏目容器 ===== */
        .category-section {
            display: none;
        }
        .category-section.active {
            display: block;
        }

        .video-list-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: clamp(16px, 1.8vw, 28px);
            margin-top: 10px;
        }

        .video-card {
            cursor: pointer;
            border-radius: var(--radius);
            overflow: hidden;
            background: #fff;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            border: 1px solid #e8eaed;
        }
        .video-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
            border-color: var(--primary);
        }
        .video-thumb {
            position: relative;
            aspect-ratio: 16 / 9;
            background: #2d2d2d;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .video-thumb .thumb-bg {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.5;
            background: linear-gradient(145deg, #3a3a3a, #1e1e1e);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 48px;
            color: rgba(255, 255, 255, 0.08);
        }
        .video-thumb .play-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: clamp(44px, 5vw, 72px);
            height: clamp(44px, 5vw, 72px);
            background: rgba(254, 107, 3, 0.92);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: clamp(20px, 2.2vw, 34px);
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(254, 107, 3, 0.4);
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .video-card:hover .play-icon {
            transform: translate(-50%, -50%) scale(1.10);
            background: var(--primary);
            box-shadow: 0 6px 30px rgba(254, 107, 3, 0.55);
        }
        .video-thumb .duration {
            position: absolute;
            bottom: 10px;
            right: 12px;
            background: rgba(0, 0, 0, 0.75);
            color: #fff;
            padding: 2px 10px;
            border-radius: 12px;
            font-size: clamp(11px, 0.8vw, 14px);
            font-weight: 500;
            backdrop-filter: blur(4px);
        }
        .video-info {
            padding: 12px 14px 14px;
        }
        .video-info h4 {
            font-size: clamp(14px, 1.1vw, 18px);
            font-weight: 600;
            color: #222;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .video-info .views {
            font-size: clamp(12px, 0.8vw, 14px);
            color: #888;
            margin-top: 2px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .page-1,
        .page-2 {
            display: none;
        }
        .page-1.active,
        .page-2.active {
            display: grid;
        }

        /* ===== 分页 ===== */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            margin: 30px 0 20px;
            flex-wrap: wrap;
        }
        .pagination button {
            background: #fff;
            border: 1px solid #ddd;
            color: #333;
            padding: 6px 14px;
            border-radius: 6px;
            font-size: clamp(14px, 1vw, 17px);
            cursor: pointer;
            transition: var(--transition);
            min-width: 40px;
            text-align: center;
        }
        .pagination button:hover:not(:disabled) {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .pagination button.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
        }
        .pagination button:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }
        .pagination .page-info {
            font-size: clamp(14px, 1vw, 17px);
            color: #555;
            margin: 0 8px;
        }

        /* ===== 右侧客服 ===== */
        .side-float {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .side-item {
            position: relative;
            width: 54px;
            height: 54px;
            border-radius: 50%;
            background: #fff;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: #555;
            transition: var(--transition);
            cursor: pointer;
            border: 1px solid #eee;
        }
        .side-item:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 6px 24px rgba(254, 107, 3, 0.20);
            transform: scale(1.05);
        }
        .side-item i {
            font-size: 24px;
        }
        .side-popup {
            position: absolute;
            right: 64px;
            top: 50%;
            transform: translateY(-50%);
            background: #fff;
            padding: 16px 20px;
            border-radius: 12px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.18);
            border: 1px solid #eee;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.25s ease, transform 0.2s ease;
            transform: translateY(-50%) scale(0.96);
            min-width: 140px;
            text-align: left;
            font-size: 14px;
            color: #333;
        }
        .side-item:hover .side-popup {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(-50%) scale(1);
        }
        .side-popup::after {
            content: '';
            position: absolute;
            right: -8px;
            top: 50%;
            transform: translateY(-50%);
            border: 8px solid transparent;
            border-left-color: #fff;
        }
        .side-popup .popup-title {
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 4px;
            font-size: 15px;
        }
        .side-popup .popup-row {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 4px;
            font-size: 13px;
        }
        .side-popup .popup-row i {
            width: 18px;
            color: var(--primary);
            font-size: 14px;
        }
        .side-popup .popup-qr {
            width: 100px;
            height: 100px;
            margin: 6px auto 0;
            border: 1px solid #ddd;
            border-radius: 6px;
            padding: 4px;
            background: #fafafa;
        }
        .side-popup .popup-qr img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        .side-popup .wx-id {
            font-weight: 500;
            color: #222;
            margin-top: 2px;
            font-size: 13px;
        }
        .side-item.back-top {
            background: rgba(255, 255, 255, 0.90);
            backdrop-filter: blur(4px);
        }
        .side-item.back-top i {
            color: var(--secondary);
        }

        /* ===== 视频播放模态框 ===== */
        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 9999;
            background: rgba(0, 0, 0, 0.82);
            backdrop-filter: blur(6px);
            align-items: center;
            justify-content: center;
            padding: 20px;
            animation: fadeIn 0.3s ease;
        }
        .modal-overlay.active {
            display: flex;
        }
        .modal-box {
            background: #1a1a1a;
            border-radius: 16px;
            max-width: 900px;
            width: 100%;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
            overflow: hidden;
            position: relative;
            animation: scaleIn 0.35s ease;
        }
        .modal-box .modal-close {
            position: absolute;
            top: 12px;
            right: 16px;
            z-index: 10;
            background: rgba(0, 0, 0, 0.55);
            color: #fff;
            border: none;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            font-size: 22px;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .modal-box .modal-close:hover {
            background: var(--primary);
            transform: rotate(90deg);
        }
        .modal-box video {
            width: 100%;
            display: block;
            background: #000;
            aspect-ratio: 16 / 9;
        }
        .modal-box .modal-title {
            padding: 14px 24px;
            background: #222;
            color: #fff;
            font-size: clamp(16px, 1.2vw, 22px);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .modal-box .modal-title i {
            color: var(--primary);
        }

        /* ===== 咨询弹窗 ===== */
        .consult-modal {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 9998;
            background: rgba(0, 0, 0, 0.60);
            backdrop-filter: blur(4px);
            align-items: center;
            justify-content: center;
            padding: 20px;
            animation: fadeIn 0.25s ease;
        }
        .consult-modal.active {
            display: flex;
        }
        .consult-box {
            background: #fff;
            border-radius: 16px;
            max-width: 760px;
            width: 100%;
            padding: 28px 24px 24px;
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
            animation: scaleIn 0.3s ease;
            position: relative;
        }
        .consult-box .close-btn {
            position: absolute;
            top: 12px;
            right: 16px;
            background: none;
            border: none;
            font-size: 28px;
            color: #999;
            cursor: pointer;
            transition: var(--transition);
        }
        .consult-box .close-btn:hover {
            color: var(--primary);
            transform: rotate(90deg);
        }
        .consult-box .consult-title {
            font-size: clamp(22px, 2vw, 30px);
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 20px;
            text-align: center;
        }
        .consult-box .consult-title i {
            margin-right: 8px;
        }
        .consult-contacts {
            display: flex;
            gap: 30px;
            justify-content: center;
            align-items: stretch;
        }
        .contact-card {
            flex: 1;
            min-width: 0;
            background: #fafafa;
            border-radius: 12px;
            padding: 18px 16px 20px;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        .contact-card .name {
            font-size: clamp(20px, 1.6vw, 26px);
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .contact-card .phone-row {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: clamp(16px, 1.2vw, 20px);
            font-weight: 600;
            color: #222;
            margin-bottom: 10px;
        }
        .contact-card .phone-row i {
            color: var(--primary);
        }
        .contact-card .btn-call {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 6px 20px;
            border-radius: 30px;
            font-size: clamp(14px, 1vw, 17px);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 12px;
        }
        .contact-card .btn-call:hover {
            background: var(--primary-dark);
            transform: scale(1.04);
        }
        .contact-card .qr-wrapper {
            margin: 6px 0 8px;
        }
        .contact-card .qr-wrapper .qr-code {
            width: 120px;
            height: 120px;
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 4px;
            background: #fff;
            margin: 0 auto;
        }
        .contact-card .qr-wrapper .qr-code img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        .contact-card .wx-id {
            font-size: clamp(14px, 1vw, 17px);
            font-weight: 500;
            color: #222;
            margin: 4px 0 8px;
        }
        .contact-card .copy-btn {
            background: var(--secondary);
            color: #fff;
            border: none;
            border-radius: 20px;
            padding: 6px 18px;
            font-size: clamp(13px, 0.9vw, 15px);
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .contact-card .copy-btn:hover {
            background: var(--secondary-dark);
            transform: scale(1.04);
        }
        .contact-card .copy-tip {
            font-size: 13px;
            color: var(--secondary);
            margin-top: 4px;
            min-height: 20px;
        }

        /* ===== 网站底部 ===== */
        .site-footer {
            background: #1e1e1e;
            color: #888;
            padding: 20px 20px;
            margin-top: 40px;
            border-top: 3px solid var(--primary);
            text-align: center;
            font-size: clamp(13px, 0.9vw, 16px);
        }

        /* ===== 手机底部导航 ===== */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1001;
            background: #fff;
            border-top: 1px solid #e0e0e0;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            justify-content: space-around;
            align-items: center;
        }
        .mobile-bottom-nav .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 4px 12px;
            color: #888;
            font-size: clamp(10px, 1.8vw, 13px);
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            background: none;
            min-width: 56px;
        }
        .mobile-bottom-nav .nav-item i {
            font-size: clamp(20px, 4vw, 28px);
            transition: var(--transition);
        }
        .mobile-bottom-nav .nav-item.active {
            color: var(--primary);
        }
        .mobile-bottom-nav .nav-item.active i {
            color: var(--primary);
        }
        .mobile-bottom-nav .nav-item:hover {
            color: var(--primary);
        }
        .mobile-bottom-nav .nav-item.primary-btn {
            background: var(--primary);
            color: #fff;
            padding: 6px 16px;
            border-radius: 30px;
            min-width: auto;
        }
        .mobile-bottom-nav .nav-item.primary-btn i {
            color: #fff;
        }
        .mobile-bottom-nav .nav-item.primary-btn:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media screen and (max-width: 1024px) {
            .container {
                width: 94%;
                padding: 0 12px;
            }
            .video-list-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
            .side-float {
                right: 12px;
                gap: 10px;
            }
            .side-item {
                width: 46px;
                height: 46px;
                font-size: 20px;
            }
            .side-item i {
                font-size: 20px;
            }
            .side-popup {
                right: 54px;
                padding: 12px 16px;
                min-width: 120px;
            }
            .side-popup .popup-qr {
                width: 80px;
                height: 80px;
            }
            .navbar {
                padding: 0 12px;
                height: 66px;
            }
            body {
                padding-top: 66px;
            }
            .navbar .logo {
                width: auto;
                flex: 0 1 auto;
            }
            .nav-cta-wrapper {
                width: auto;
            }
            .consult-box {
                max-width: 96%;
                padding: 20px 16px;
            }
            .consult-contacts {
                gap: 16px;
            }
            .contact-card .qr-wrapper .qr-code {
                width: 100px;
                height: 100px;
            }
            .page-1.active,
            .page-2.active {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media screen and (max-width: 768px) {
            .container {
                width: 100%;
                padding: 0 10px;
            }
            .video-list-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .navbar {
                height: 60px;
                padding: 0 10px;
            }
            body {
                padding-top: 60px;
                padding-bottom: 72px;
            }

            .nav-cta-wrapper {
                display: none !important;
            }
            .menu-toggle {
                display: flex !important;
                align-items: center;
                justify-content: center;
                font-size: 28px;
                color: #333;
                background: none;
                border: none;
                padding: 4px 8px;
                margin-left: auto;
                cursor: pointer;
                flex: 0 0 auto;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                padding: 16px 20px 24px;
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
                border-top: 1px solid #eee;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu > ul {
                flex-direction: column;
                width: 100%;
                gap: 4px;
            }
            .nav-menu > ul > li {
                width: 100%;
                display: flex;
                flex-wrap: wrap;
                align-items: center;
                border-bottom: 1px solid #f0f0f0;
                padding: 6px 0;
            }
            .nav-menu > ul > li > a {
                flex: 1;
                font-size: 16px;
                padding: 6px 0;
                border-bottom: none;
                text-align: left;
                color: #333;
            }
            .nav-menu > ul > li > a.active {
                color: var(--primary);
            }
            .dropdown-toggle {
                font-size: 18px;
                padding: 0 12px;
            }
            .dropdown-menu {
                position: static;
                box-shadow: none;
                border: none;
                padding-left: 16px;
                width: 100%;
                background: #f9f9f9;
                border-radius: 4px;
                margin-top: 4px;
            }
            .dropdown-menu li a {
                padding: 8px 16px;
                font-size: 14px;
            }
            .has-dropdown.open .dropdown-menu {
                display: flex;
            }
            .nav-menu > ul > li:last-child {
                border-bottom: none;
            }

            .consult-box {
                max-height: 60vh;
                overflow-y: auto;
                padding: 20px 12px;
                margin: 10px;
                max-width: 100%;
            }
            .consult-contacts {
                flex-direction: column;
                gap: 20px;
            }
            .contact-card {
                padding: 16px 12px;
            }
            .contact-card .qr-wrapper .qr-code {
                width: 120px;
                height: 120px;
            }

            .side-float {
                display: none !important;
            }
            .mobile-bottom-nav {
                display: flex !important;
            }

            .modal-box {
                max-width: 100%;
                border-radius: 10px;
            }
            .modal-box .modal-close {
                top: 8px;
                right: 10px;
                width: 34px;
                height: 34px;
                font-size: 18px;
            }
            .modal-box .modal-title {
                padding: 10px 16px;
                font-size: 15px;
            }

            .page-banner {
                padding: 20px 16px;
                margin-bottom: 20px;
            }
            .page-banner h1 {
                font-size: 22px;
            }
            .page-1.active,
            .page-2.active {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media screen and (max-width: 420px) {
            .video-list-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 8px;
            }
            .video-info {
                padding: 8px 10px 10px;
            }
            .video-info h4 {
                font-size: 12px;
            }
            .video-info .views {
                font-size: 10px;
            }
            .mobile-bottom-nav .nav-item {
                padding: 2px 6px;
                font-size: 10px;
                min-width: 44px;
            }
            .mobile-bottom-nav .nav-item i {
                font-size: 18px;
            }
            .mobile-bottom-nav .nav-item.primary-btn {
                padding: 4px 12px;
            }
            .contact-card .qr-wrapper .qr-code {
                width: 100px;
                height: 100px;
            }
            .pagination button {
                padding: 4px 10px;
                font-size: 13px;
                min-width: 32px;
            }
            .page-1.active,
            .page-2.active {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media screen and (min-width: 1920px) {
            .container {
                max-width: 1600px;
            }
            .video-list-grid {
                gap: 30px;
            }
            .side-float {
                right: 40px;
            }
            .side-item {
                width: 64px;
                height: 64px;
                font-size: 28px;
            }
            .side-item i {
                font-size: 28px;
            }
            .side-popup {
                min-width: 180px;
                padding: 20px 24px;
            }
            .side-popup .popup-qr {
                width: 120px;
                height: 120px;
            }
            .consult-box {
                max-width: 860px;
            }
            .page-1.active,
            .page-2.active {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        /* ===== 动画 ===== */
        @keyframes fadeIn {
            from {
                opacity: 0;
            }
            to {
                opacity: 1;
            }
        }
        @keyframes scaleIn {
            from {
                opacity: 0;
                transform: scale(0.92) translateY(20px);
            }
            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-2 {
            margin-top: 20px;
        }
        .mb-2 {
            margin-bottom: 20px;
        }