/* ========== 主页特有：3D 悬浮网关卡 ========== */
        .gateway-section {
            min-height: 100vh;
            padding: 140px 48px 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #eef6fb;
            position: relative;
            overflow: hidden;
        }

        .gateway-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: url("../images/gateway-pattern.svg");
            pointer-events: none;
        }

        .gateway-grid {
            position: relative;
            z-index: 2;
            max-width: 1440px;
            width: 100%;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: stretch;
            min-height: 560px;
        }

        .gateway-card {
            position: relative;
            border-radius: 24px;
            padding: 48px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: flex-start;
            text-decoration: none;
            color: #0f1b2a;
            background: #ffffff;
            box-shadow: 0 8px 32px rgba(10, 61, 98, 0.08);
            transform-style: preserve-3d;
            transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.35s ease;
            will-change: transform;
            overflow: hidden;
            border: 1px solid rgba(10, 61, 98, 0.06);
        }

        .gateway-card::before {
            content: "";
            position: absolute;
            inset: -2px;
            border-radius: 26px;
            background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(0, 168, 232, 0.45), transparent 55%);
            opacity: 0;
            z-index: -1;
            transition: opacity 0.35s ease;
            filter: blur(16px);
        }

        .gateway-card::after {
            content: "";
            position: absolute;
            inset: 0;
            border-radius: 24px;
            background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(0, 168, 232, 0.10), transparent 50%);
            opacity: 0;
            transition: opacity 0.35s ease;
            pointer-events: none;
            z-index: 0;
        }

        .gateway-card:hover::before,
        .gateway-card:hover::after {
            opacity: 1;
        }

        .gateway-card:hover {
            box-shadow: 0 24px 64px rgba(10, 61, 98, 0.16);
        }

        .gateway-card > * {
            position: relative;
            z-index: 1;
            text-shadow: 0 2px 14px rgba(255, 255, 255, 0.9);
        }

        /* 背景图占位：用户可替换为透底产品图 */
        .gateway-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            background-repeat: no-repeat;
            background-position: right bottom;
            background-size: contain;
            opacity: 0.9;
            pointer-events: none;
            transition: transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
        }

        .gateway-card:hover .gateway-bg {
            transform: scale(1.04);
        }

        .gateway-card[data-card="billing"] .gateway-bg {
            background-image: url('../images/jifbuttom.png');
        }

        .gateway-card[data-card="fuyan"] .gateway-bg {
            background-image: url('../images/fuyanbuttom.png');
        }

        .gateway-label {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: #00a8e8;
            background: rgba(0, 168, 232, 0.08);
            padding: 7px 14px;
            border-radius: 30px;
            margin-bottom: 20px;
            transform: translateZ(30px);
        }

        .gateway-title {
            font-size: 42px;
            font-weight: 800;
            color: #0a3d62;
            margin-bottom: 18px;
            line-height: 1.2;
            transform: translateZ(30px);
        }

        .gateway-desc {
            font-size: 18px;
            color: #4a5f72;
            line-height: 1.8;
            margin-bottom: 36px;
            max-width: 460px;
            transform: translateZ(24px);
        }

        .gateway-action {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 16px;
            font-weight: 700;
            color: #00a8e8;
            transform: translateZ(36px);
            transition: gap 0.3s ease;
        }

        .gateway-action svg {
            width: 20px;
            height: 20px;
            transition: transform 0.3s ease;
        }

        .gateway-card:hover .gateway-action {
            gap: 16px;
        }

        .gateway-card:hover .gateway-action svg {
            transform: translateX(4px);
        }

        @media (max-width: 1024px) {
            .gateway-grid {
                gap: 24px;
                min-height: 480px;
            }
            .gateway-title { font-size: 28px; }
        }

        @media (max-width: 768px) {
            .gateway-section {
                padding: 120px 20px 60px;
            }
            .gateway-grid {
                grid-template-columns: 1fr;
                min-height: auto;
            }
            .gateway-card {
                padding: 36px 28px;
            }
            .gateway-title { font-size: 26px; }
        }

        /* 联系表单样式补充 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: stretch;
        }

        .info-card,
        .lead {
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .info-card {
            background: #ffffff;
            border-radius: 20px;
            padding: 32px;
            box-shadow: 0 8px 28px rgba(10, 61, 98, 0.06);
            justify-content: flex-start;
            gap: 22px;
        }

        .lead button[type="submit"] {
            margin-top: auto;
        }

        .info-block { margin-bottom: 0; }

        .info-block .lbl {
            font-size: 14px;
            font-weight: 600;
            color: #00a8e8;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .info-block .val {
            font-size: 20px;
            font-weight: 600;
            color: #0a3d62;
            line-height: 1.6;
        }

        .qr-img {
            width: 140px;
            height: 140px;
            border-radius: 12px;
            object-fit: cover;
            margin-top: 8px;
            box-shadow: 0 4px 12px rgba(10, 61, 98, 0.08);
        }

        /* 客服二维码翻转卡片 */
        .qr-flip-card {
            perspective: 1000px;
            height: 100%;
            min-height: 360px;
        }

        .qr-flip-inner {
            position: relative;
            width: 100%;
            height: 100%;
            text-align: center;
            transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            transform-style: preserve-3d;
        }

        .qr-flip-card:hover .qr-flip-inner {
            transform: rotateY(180deg);
        }

        .qr-flip-front,
        .qr-flip-back {
            position: absolute;
            width: 100%;
            height: 100%;
            -webkit-backface-visibility: hidden;
            backface-visibility: hidden;
            border-radius: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 36px;
            box-shadow: 0 8px 28px rgba(10, 61, 98, 0.06);
        }

        .qr-flip-front {
            background: #ffffff;
        }

        .qr-flip-back {
            background: #0a3d62;
            color: #ffffff;
            transform: rotateY(180deg);
        }

        .qr-flip-img {
            width: 240px;
            height: 240px;
            border-radius: 16px;
            object-fit: cover;
            box-shadow: 0 8px 24px rgba(10, 61, 98, 0.12);
        }

        .qr-flip-hint {
            font-size: 20px;
            font-weight: 700;
            color: #0a3d62;
            margin-bottom: 24px;
        }

        .qr-flip-tip {
            font-size: 13px;
            color: #4a5f72;
            margin-top: 20px;
        }

        .qr-flip-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .qr-flip-back p {
            font-size: 15px;
            line-height: 1.8;
            opacity: 0.9;
        }

        @media (max-width: 768px) {
            .qr-flip-img {
                width: 180px;
                height: 180px;
            }
            .qr-flip-hint {
                font-size: 18px;
            }
        }

        .lead {
            background: #ffffff;
            border-radius: 20px;
            padding: 36px;
            box-shadow: 0 8px 28px rgba(10, 61, 98, 0.06);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .field {
            margin-bottom: 20px;
        }

        .field label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: #0a3d62;
            margin-bottom: 8px;
        }

        .field input,
        .field select,
        .field textarea {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid rgba(10, 61, 98, 0.12);
            border-radius: 12px;
            background: #f8fbfd;
            font-size: 15px;
            color: #0f1b2a;
            outline: none;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .field input:focus,
        .field select:focus,
        .field textarea:focus {
            border-color: #00a8e8;
            box-shadow: 0 0 0 3px rgba(0, 168, 232, 0.12);
        }

        .field input.invalid,
        .field select.invalid,
        .field textarea.invalid {
            border-color: #ef4444;
        }

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

        .field .err {
            display: none;
            font-size: 13px;
            color: #ef4444;
            margin-top: 6px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
        }

        .btn-primary {
            background: linear-gradient(135deg, #00a8e8 0%, #0a3d62 100%);
            color: #ffffff;
            box-shadow: 0 8px 24px rgba(0, 168, 232, 0.28);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0, 168, 232, 0.38);
        }

        .btn-lg { padding: 16px 32px; font-size: 16px; }
        .btn-block { width: 100%; }

        .timeline {
            background: #ffffff;
            border-radius: 20px;
            padding: 36px;
            box-shadow: 0 8px 28px rgba(10, 61, 98, 0.06);
        }

        .timeline h4 {
            font-size: 20px;
            font-weight: 700;
            color: #0a3d62;
            margin-bottom: 24px;
        }

        .tl {
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 0;
            padding-left: 20px;
        }

        .tl::before {
            content: "";
            position: absolute;
            left: 5px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: linear-gradient(to bottom, #00a8e8, rgba(0, 168, 232, 0.15));
            border-radius: 2px;
        }

        .tl-item {
            position: relative;
            display: flex;
            align-items: baseline;
            gap: 16px;
            padding: 14px 0;
        }

        .tl-item::before {
            content: "";
            position: absolute;
            left: -19px;
            top: 20px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #ffffff;
            border: 3px solid #00a8e8;
            box-shadow: 0 0 0 4px rgba(0, 168, 232, 0.12);
            z-index: 1;
        }

        .tl-item:first-child::before {
            background: #00a8e8;
            box-shadow: 0 0 0 5px rgba(0, 168, 232, 0.2);
        }

        .tl-year {
            flex-shrink: 0;
            font-size: 15px;
            font-weight: 800;
            color: #00a8e8;
            width: 52px;
        }

        .tl-text {
            font-size: 15px;
            color: #3d4f61;
            line-height: 1.5;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .btn-secondary {
            background: #ffffff;
            color: #0a3d62;
            border: 1px solid rgba(10, 61, 98, 0.15);
            box-shadow: 0 4px 16px rgba(10, 61, 98, 0.06);
        }

        .btn-secondary:hover {
            border-color: #00a8e8;
            color: #00a8e8;
            transform: translateY(-2px);
        }

        @media (max-width: 1024px) {
            .contact-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 768px) {
            .form-row { grid-template-columns: 1fr; }
            .timeline { padding: 28px 24px; }
        }

        /* 全页粒子漂浮背景 */
        #particle-canvas {
            position: fixed;
            inset: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
        }