:root {
            /* ===== 全新配色体系：深海科技风 ===== */
            --primary: #0066cc;
            --primary-bright: #1a7dff;
            --primary-deep: #004d99;
            --primary-soft: #e8f3ff;
            --primary-glow: rgba(0, 102, 204, 0.18);

            --accent: #00a8b5;
            --accent-soft: #e0f7f9;
            --accent-glow: rgba(0, 168, 181, 0.16);

            --navy-deep: #060f1e;
            --navy: #0b1a30;
            --navy-mid: #0f2240;
            --navy-light: #152a4d;

            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #5f6b7a;
            --text-on-dark: #e2e8f0;
            --text-on-dark-muted: #94a3b8;

            --bg-white: #ffffff;
            --bg-slate: #f7f9fb;
            --bg-cool: #eef2f7;
            --bg-warm: #fafbfc;

            --border: #dde4ed;
            --border-light: #e8edf4;
            --border-subtle: #f0f3f7;

            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
            --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 6px 22px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 14px 40px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 22px 56px rgba(0, 0, 0, 0.10);
            --shadow-glow: 0 0 40px rgba(0, 102, 204, 0.12);

            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius: 16px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --radius-full: 9999px;

            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

            --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            color: var(--text-primary);
            background-color: var(--bg-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 28px;
        }

        /* ========== HEADER ========== */
        .header {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 84px;
            display: flex;
            align-items: center;
            z-index: 100;
            background: transparent;
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
        }
        .header.scrolled {
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            box-shadow: var(--shadow-sm);
            position: fixed;
            transform: translateY(0);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            gap: 32px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            transition: opacity var(--transition);
        }
        .logo-area:hover {
            opacity: 0.85;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
            border-radius: 8px;
            background: linear-gradient(135deg, #0066cc 0%, #00a8b5 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 900;
            font-size: 16px;
            letter-spacing: -0.5px;
            box-shadow: 0 2px 10px rgba(0, 102, 204, 0.25);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: #0b1a30;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .logo-text .logo-accent {
            color: #0066cc;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 6px;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
        }
        .nav-item {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            padding: 8px 15px;
            border-radius: 20px;
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
            letter-spacing: -0.1px;
        }
        .nav-item:hover {
            color: #0066cc;
            background: rgba(0, 102, 204, 0.05);
        }
        .nav-item.nav-cta {
            background: #0066cc;
            color: #fff;
            font-weight: 700;
            padding: 10px 20px;
            border-radius: 22px;
            margin-left: 2px;
            letter-spacing: 0.1px;
            box-shadow: 0 2px 10px rgba(0, 102, 204, 0.22);
            transition: all var(--transition);
        }
        .nav-item.nav-cta:hover {
            background: #004d99;
            color: #fff;
            box-shadow: 0 4px 16px rgba(0, 102, 204, 0.32);
            transform: translateY(-1px);
        }

        /* Mobile menu toggle */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            flex-shrink: 0;
        }
        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: #0b1a30;
            border-radius: 2px;
            margin: 5px 0;
            transition: all var(--transition);
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            padding: 160px 0 90px;
            background: linear-gradient(160deg, #f0f6fc 0%, #e4eef8 25%, #f5f8fb 55%, #eaf3fa 100%);
            overflow: hidden;
            isolation: isolate;
        }
        .hero::before {
            content: '';
            position: absolute;
            width: 620px;
            height: 620px;
            background: radial-gradient(circle at 52% 44%, rgba(0, 102, 204, 0.07) 0%, transparent 66%);
            top: -100px;
            right: -130px;
            border-radius: 50%;
            z-index: 0;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            width: 360px;
            height: 360px;
            background: radial-gradient(circle at 38% 42%, rgba(0, 168, 181, 0.05) 0%, transparent 62%);
            bottom: -50px;
            left: -60px;
            border-radius: 50%;
            z-index: 0;
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            align-items: center;
            gap: 36px;
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            font-size: 13px;
            color: #0066cc;
            font-weight: 700;
            margin-bottom: 18px;
            background: rgba(0, 102, 204, 0.06);
            padding: 7px 15px;
            border-radius: 18px;
            letter-spacing: 0.1px;
        }
        .hero-badge .badge-dot {
            width: 7px;
            height: 7px;
            background: #10b981;
            border-radius: 50%;
            animation: pulse-dot 2.2s infinite;
            box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.45;
                transform: scale(1.7);
            }
        }
        .hero-title {
            font-size: 48px;
            line-height: 1.16;
            font-weight: 850;
            color: #060f1e;
            margin-bottom: 18px;
            letter-spacing: -0.5px;
        }
        .hero-title .highlight {
            color: #0066cc;
            position: relative;
            white-space: nowrap;
        }
        .hero-title .highlight::after {
            content: '';
            position: absolute;
            bottom: 3px;
            left: 0;
            width: 100%;
            height: 3px;
            background: rgba(0, 102, 204, 0.22);
            border-radius: 2px;
        }
        .hero-subtitle {
            font-size: 16.5px;
            color: var(--text-secondary);
            margin-bottom: 30px;
            max-width: 500px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 14px 34px;
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            background: #0066cc;
            border-radius: 26px;
            transition: all var(--transition);
            white-space: nowrap;
            border: none;
            cursor: pointer;
            letter-spacing: 0.1px;
            box-shadow: 0 4px 16px rgba(0, 102, 204, 0.22);
        }
        .btn-primary:hover {
            background: #004d99;
            transform: translateY(-2px);
            box-shadow: 0 8px 26px rgba(0, 102, 204, 0.30);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 13px 30px;
            font-size: 14.5px;
            font-weight: 700;
            color: #0066cc;
            background: transparent;
            border: 2px solid #c8d6e5;
            border-radius: 26px;
            transition: all var(--transition);
            white-space: nowrap;
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: #0066cc;
            background: rgba(0, 102, 204, 0.03);
            transform: translateY(-2px);
        }

        /* Hero visual - glowing node cluster */
        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 340px;
        }
        .node-cluster {
            position: relative;
            width: 320px;
            height: 320px;
        }
        .node-center {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 70px;
            height: 70px;
            background: radial-gradient(circle, #0066cc 0%, #004d99 100%);
            border-radius: 50%;
            z-index: 4;
            box-shadow: 0 0 50px rgba(0, 102, 204, 0.40), 0 0 100px rgba(0, 102, 204, 0.18);
            animation: center-pulse 3s ease-in-out infinite;
        }
        @keyframes center-pulse {
            0%,
            100% {
                box-shadow: 0 0 50px rgba(0, 102, 204, 0.40), 0 0 100px rgba(0, 102, 204, 0.18);
            }
            50% {
                box-shadow: 0 0 70px rgba(0, 102, 204, 0.55), 0 0 130px rgba(0, 102, 204, 0.25);
            }
        }
        .node-ring {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            border: 1.5px dashed rgba(0, 102, 204, 0.25);
            z-index: 1;
            pointer-events: none;
        }
        .node-ring.r1 {
            width: 160px;
            height: 160px;
            animation: ring-rotate 20s linear infinite;
        }
        .node-ring.r2 {
            width: 250px;
            height: 250px;
            animation: ring-rotate 28s linear infinite reverse;
            border-color: rgba(0, 168, 181, 0.20);
        }
        .node-ring.r3 {
            width: 310px;
            height: 310px;
            animation: ring-rotate 34s linear infinite;
            border-color: rgba(0, 102, 204, 0.14);
            border-style: dotted;
        }
        @keyframes ring-rotate {
            from {
                transform: translate(-50%, -50%) rotate(0deg);
            }
            to {
                transform: translate(-50%, -50%) rotate(360deg);
            }
        }
        .node-satellite {
            position: absolute;
            width: 12px;
            height: 12px;
            background: #fff;
            border-radius: 50%;
            z-index: 3;
            box-shadow: 0 0 12px rgba(0, 102, 204, 0.5), 0 2px 6px rgba(0, 0, 0, 0.08);
            border: 2px solid #0066cc;
        }
        .node-satellite.s1 {
            top: 18%;
            left: 22%;
            animation: float-s1 5s ease-in-out infinite;
        }
        .node-satellite.s2 {
            top: 12%;
            right: 20%;
            animation: float-s2 5.5s ease-in-out infinite 0.6s;
            border-color: #00a8b5;
            box-shadow: 0 0 12px rgba(0, 168, 181, 0.5), 0 2px 6px rgba(0, 0, 0, 0.06);
        }
        .node-satellite.s3 {
            bottom: 22%;
            left: 28%;
            animation: float-s3 6s ease-in-out infinite 1.2s;
        }
        .node-satellite.s4 {
            bottom: 16%;
            right: 24%;
            animation: float-s4 5.2s ease-in-out infinite 0.3s;
            border-color: #00a8b5;
            box-shadow: 0 0 12px rgba(0, 168, 181, 0.5), 0 2px 6px rgba(0, 0, 0, 0.06);
        }
        @keyframes float-s1 {
            0%,
            100% {
                transform: translate(0, 0);
            }
            50% {
                transform: translate(8px, -10px);
            }
        }
        @keyframes float-s2 {
            0%,
            100% {
                transform: translate(0, 0);
            }
            50% {
                transform: translate(-7px, 8px);
            }
        }
        @keyframes float-s3 {
            0%,
            100% {
                transform: translate(0, 0);
            }
            50% {
                transform: translate(-6px, -7px);
            }
        }
        @keyframes float-s4 {
            0%,
            100% {
                transform: translate(0, 0);
            }
            50% {
                transform: translate(9px, 6px);
            }
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-slate);
        }
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-tag {
            display: inline-block;
            font-size: 12.5px;
            font-weight: 700;
            color: #0066cc;
            background: rgba(0, 102, 204, 0.06);
            padding: 6px 15px;
            border-radius: 18px;
            margin-bottom: 14px;
            letter-spacing: 0.4px;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: #060f1e;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-desc {
            font-size: 15.5px;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ========== WHY SECTION ========== */
        .why-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .why-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 34px 28px;
            transition: all var(--transition-slow);
            position: relative;
            overflow: hidden;
            cursor: default;
        }
        .why-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, #0066cc, #00a8b5);
            opacity: 0;
            transition: opacity var(--transition-slow);
            border-radius: 0 0 2px 2px;
        }
        .why-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .why-card:hover::before {
            opacity: 1;
        }
        .why-card-icon {
            font-size: 34px;
            margin-bottom: 16px;
            display: block;
            line-height: 1;
        }
        .why-card h3 {
            font-size: 17px;
            font-weight: 750;
            color: #060f1e;
            margin-bottom: 9px;
            letter-spacing: -0.2px;
        }
        .why-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
        }
        .why-card .why-link {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            font-size: 13px;
            font-weight: 650;
            color: #0066cc;
            margin-top: 12px;
            transition: gap var(--transition);
            cursor: pointer;
        }
        .why-card .why-link:hover {
            gap: 8px;
            color: #004d99;
        }

        /* ========== PROTOCOL SECTION ========== */
        .protocol-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 44px;
            align-items: center;
        }
        .protocol-content h2 {
            font-size: 30px;
            font-weight: 800;
            color: #060f1e;
            margin-bottom: 18px;
            letter-spacing: -0.3px;
        }
        .protocol-content p {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .protocol-table-wrap {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
        }
        .protocol-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 13.5px;
            min-width: 380px;
        }
        .protocol-table th,
        .protocol-table td {
            padding: 12px 16px;
            text-align: center;
            border-bottom: 1px solid var(--border-light);
        }
        .protocol-table th {
            background: #f7f9fb;
            font-weight: 700;
            color: #060f1e;
            font-size: 12.5px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .protocol-table td {
            color: var(--text-secondary);
            font-weight: 500;
        }
        .protocol-table .highlight-row {
            background: #f0f7ff;
            font-weight: 700;
            color: #0066cc;
        }
        .protocol-table .highlight-row td {
            color: #0066cc;
            font-weight: 700;
        }
        .protocol-visual {
            background: linear-gradient(145deg, #f0f5fa, #e6eef7);
            border-radius: var(--radius-xl);
            padding: 36px 28px;
            display: flex;
            flex-direction: column;
            gap: 14px;
            min-height: 350px;
            justify-content: center;
            border: 1px solid var(--border-light);
        }
        .proto-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            padding: 13px 16px;
            border-radius: var(--radius-xs);
            font-size: 13px;
            font-weight: 600;
            color: #060f1e;
            box-shadow: var(--shadow-xs);
            transition: transform var(--transition);
            cursor: default;
        }
        .proto-bar:hover {
            transform: translateX(4px);
        }
        .proto-bar .proto-indicator {
            width: 9px;
            height: 9px;
            border-radius: 50%;
            flex-shrink: 0;
        }
        .proto-bar .proto-indicator.green {
            background: #10b981;
            box-shadow: 0 0 7px rgba(16, 185, 129, 0.4);
        }
        .proto-bar .proto-indicator.blue {
            background: #0066cc;
            box-shadow: 0 0 7px rgba(0, 102, 204, 0.4);
        }

        /* ========== PLATFORM SECTION ========== */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 18px;
        }
        .platform-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 26px 16px;
            text-align: center;
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
            color: inherit;
            display: block;
        }
        .platform-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .platform-card .plat-icon {
            font-size: 36px;
            margin-bottom: 12px;
            display: block;
        }
        .platform-card h4 {
            font-size: 14px;
            font-weight: 700;
            color: #060f1e;
            margin-bottom: 5px;
        }
        .platform-card p {
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.4;
        }

        /* ========== TREND SECTION ========== */
        .trend-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .trend-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 30px 24px;
            transition: all var(--transition);
            position: relative;
            cursor: default;
        }
        .trend-card:hover {
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }
        .trend-card .trend-num {
            font-size: 44px;
            font-weight: 900;
            color: #e4ebf3;
            position: absolute;
            top: 14px;
            right: 20px;
            line-height: 1;
            pointer-events: none;
        }
        .trend-card h4 {
            font-size: 16px;
            font-weight: 750;
            color: #060f1e;
            margin-bottom: 9px;
            position: relative;
            z-index: 1;
        }
        .trend-card p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.65;
            position: relative;
            z-index: 1;
        }
        .trend-card .trend-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 12px;
            margin-bottom: 10px;
            letter-spacing: 0.4px;
            position: relative;
            z-index: 1;
        }
        .trend-tag.ai {
            background: #ede9fe;
            color: #6d28d9;
        }
        .trend-tag.speed {
            background: #dbeafe;
            color: #1d4ed8;
        }
        .trend-tag.stable {
            background: #d1fae5;
            color: #065f46;
        }

        /* ========== ENTRY RECOMMEND ========== */
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .entry-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 28px 22px;
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
            display: flex;
            align-items: flex-start;
            gap: 14px;
            cursor: pointer;
        }
        .entry-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: transparent;
            transform: translateY(-3px);
        }
        .entry-card .entry-icon {
            font-size: 30px;
            flex-shrink: 0;
            line-height: 1;
        }
        .entry-card .entry-info h4 {
            font-size: 15px;
            font-weight: 700;
            color: #060f1e;
            margin-bottom: 4px;
        }
        .entry-card .entry-info p {
            font-size: 12.5px;
            color: var(--text-muted);
            line-height: 1.45;
        }
        .entry-card .entry-arrow {
            margin-left: auto;
            color: #c8d6e5;
            font-size: 17px;
            transition: all var(--transition);
            flex-shrink: 0;
        }
        .entry-card:hover .entry-arrow {
            color: #0066cc;
            transform: translateX(3px);
        }

        /* ========== DOWNLOAD GUIDE ========== */
        .download-guide-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .download-guide-card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 24px 18px;
            text-align: center;
            transition: all var(--transition);
            text-decoration: none;
            color: inherit;
            display: block;
            cursor: pointer;
        }
        .download-guide-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            border-color: #0066cc40;
            background: #fafcfe;
        }
        .download-guide-card .dg-icon {
            font-size: 38px;
            margin-bottom: 10px;
            display: block;
        }
        .download-guide-card h4 {
            font-size: 14px;
            font-weight: 700;
            color: #060f1e;
            margin-bottom: 4px;
        }
        .download-guide-card p {
            font-size: 11.5px;
            color: var(--text-muted);
        }

        /* ========== CTA BOTTOM ========== */
        .cta-bottom {
            padding: 76px 0;
            background: linear-gradient(150deg, #060f1e 0%, #0b1a30 35%, #0f2240 100%);
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-bottom::before {
            content: '';
            position: absolute;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0, 102, 204, 0.14) 0%, transparent 68%);
            top: -120px;
            right: -80px;
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-bottom::after {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0, 168, 181, 0.10) 0%, transparent 65%);
            bottom: -70px;
            left: -50px;
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-bottom .cta-title {
            font-size: 34px;
            font-weight: 850;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
        }
        .cta-bottom .cta-desc {
            font-size: 15.5px;
            color: #94a3b8;
            max-width: 540px;
            margin: 0 auto 30px;
            position: relative;
            z-index: 1;
            line-height: 1.7;
        }
        .cta-bottom .btn-primary {
            position: relative;
            z-index: 1;
            font-size: 15.5px;
            padding: 15px 40px;
            background: #fff;
            color: #0066cc;
            box-shadow: 0 6px 24px rgba(255, 255, 255, 0.12);
            font-weight: 750;
        }
        .cta-bottom .btn-primary:hover {
            background: #e8f3ff;
            color: #004d99;
            box-shadow: 0 8px 30px rgba(255, 255, 255, 0.18);
        }

        /* ========== FAQ SECTION ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            transition: all var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: #0066cc40;
            box-shadow: var(--shadow-sm);
        }
        .faq-item h3 {
            font-size: 15px;
            font-weight: 700;
            color: #060f1e;
            margin-bottom: 6px;
            letter-spacing: -0.1px;
        }
        .faq-item p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== FOOTER ========== */
        .footer {
            padding: 40px 0;
            background: #060f1e;
            border-top: 1px solid #1a2d44;
            color: #64748b;
            font-size: 13px;
        }
        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 18px;
        }
        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .footer-links a {
            color: #94a3b8;
            transition: color var(--transition);
            font-weight: 500;
            font-size: 12.5px;
        }
        .footer-links a:hover {
            color: #cbd5e1;
        }
        .footer-copy {
            font-size: 12px;
            color: #556577;
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1100px) {
            .header {
                position: relative;
                height: auto;
                padding: 14px 0;
                background: #fff;
                border-bottom: 1px solid var(--border-light);
            }
            .header-inner {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 10px;
                justify-content: space-between;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                gap: 2px;
                padding-top: 8px;
            }
            .nav-list.open {
                display: flex;
            }
            .nav-item {
                font-size: 13px;
                padding: 10px 14px;
                width: 100%;
                text-align: center;
                border-radius: 8px;
            }
            .nav-item.nav-cta {
                margin-left: 0;
                margin-top: 6px;
            }
            .hero {
                padding: 50px 0 50px;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 24px;
            }
            .hero-title {
                font-size: 32px;
            }
            .hero-subtitle {
                margin: 0 auto 24px;
                max-width: 100%;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-visual {
                min-height: 240px;
            }
            .node-cluster {
                width: 240px;
                height: 240px;
            }
            .node-center {
                width: 50px;
                height: 50px;
            }
            .node-ring.r1 {
                width: 120px;
                height: 120px;
            }
            .node-ring.r2 {
                width: 180px;
                height: 180px;
            }
            .node-ring.r3 {
                width: 230px;
                height: 230px;
            }
            .why-grid,
            .trend-grid,
            .entry-grid {
                grid-template-columns: 1fr;
            }
            .platform-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .download-guide-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .protocol-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
            }
            .footer-links {
                justify-content: center;
            }
        }
        @media (max-width: 640px) {
            .platform-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .download-guide-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-title {
                font-size: 26px;
            }
            .section-title {
                font-size: 24px;
            }
            .cta-bottom .cta-title {
                font-size: 24px;
            }
            .hero-visual {
                min-height: 180px;
            }
            .node-cluster {
                width: 180px;
                height: 180px;
            }
            .node-center {
                width: 38px;
                height: 38px;
            }
            .node-ring.r1 {
                width: 90px;
                height: 90px;
            }
            .node-ring.r2 {
                width: 135px;
                height: 135px;
            }
            .node-ring.r3 {
                width: 170px;
                height: 170px;
            }
            .node-satellite {
                width: 8px;
                height: 8px;
            }
            .protocol-table-wrap {
                font-size: 11px;
            }
            .protocol-table th,
            .protocol-table td {
                padding: 8px 10px;
                font-size: 11px;
            }
        }