/* roulang page: index */
:root {
            --color-primary: #2b6cb0;
            --color-primary-dark: #1a4971;
            --color-neon: #00e5ff;
            --color-nav-bg: #0f172a;
            --color-nav-text: #cbd5e1;
            --color-warm-gray: #f1f5f9;
            --color-border-light: #e2e8f0;
            --color-footer-text: #94a3b8;
            --color-bg-light: #f8fafc;
            --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-card-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
            --shadow-neon: 0 0 20px rgba(0, 229, 255, 0.4), 0 0 40px rgba(0, 229, 255, 0.2);
            --radius-card: 8px;
            --radius-btn: 6px;
            --radius-input: 6px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: #1e293b;
            background-color: #ffffff;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        @media (min-width: 1280px) {
            .container {
                padding: 0 40px;
            }
        }

        /* 导航样式 */
        .nav-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background-color: var(--color-nav-bg);
            height: 64px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .nav-logo .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--color-neon), var(--color-primary));
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #0f172a;
            font-weight: 900;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-menu li a {
            display: block;
            padding: 8px 18px;
            color: var(--color-nav-text);
            font-size: 15px;
            font-weight: 500;
            border-radius: 4px;
            transition: color var(--transition-fast), text-shadow var(--transition-fast);
            position: relative;
        }

        .nav-menu li a.active {
            color: #ffffff;
            text-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
        }

        .nav-menu li a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background-color: var(--color-neon);
            border-radius: 1px;
            box-shadow: 0 0 8px rgba(0, 229, 255, 0.7);
        }

        .nav-menu li a:hover {
            color: #ffffff;
            text-shadow: 0 0 6px rgba(0, 229, 255, 0.4);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            background: linear-gradient(135deg, var(--color-neon), #00c4d6);
            color: #0f172a;
            font-weight: 700;
            font-size: 14px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: linear-gradient(135deg, #33eaff, var(--color-neon));
            box-shadow: var(--shadow-neon);
            transform: translateY(-1px);
        }

        .nav-hamburger {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            color: #ffffff;
            font-size: 24px;
        }

        .nav-mobile-overlay {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(15, 23, 42, 0.98);
            z-index: 999;
            flex-direction: column;
            padding: 40px 20px;
            gap: 8px;
        }

        .nav-mobile-overlay.active {
            display: flex;
        }

        .nav-mobile-overlay a {
            display: block;
            padding: 14px 20px;
            color: var(--color-nav-text);
            font-size: 18px;
            font-weight: 500;
            border-radius: 8px;
            transition: all var(--transition-fast);
            border-left: 3px solid transparent;
        }

        .nav-mobile-overlay a.active {
            color: #ffffff;
            border-left-color: var(--color-neon);
            background-color: rgba(0, 229, 255, 0.08);
            text-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
        }

        .nav-mobile-overlay a:hover {
            color: #ffffff;
            background-color: rgba(255, 255, 255, 0.05);
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .nav-cta.desktop-cta {
                display: none;
            }
            .nav-hamburger {
                display: block;
            }
            .nav-inner {
                padding: 0 16px;
            }
        }

        @media (min-width: 769px) {
            .nav-mobile-overlay {
                display: none !important;
            }
        }

        /* Hero 倒计时环 */
        .countdown-ring-container {
            position: relative;
            width: 180px;
            height: 180px;
            margin: 0 auto;
        }

        .countdown-ring {
            transform: rotate(-90deg);
            width: 180px;
            height: 180px;
        }

        .countdown-ring .bg-circle {
            fill: none;
            stroke: rgba(255, 255, 255, 0.2);
            stroke-width: 8;
        }

        .countdown-ring .progress-circle {
            fill: none;
            stroke: var(--color-neon);
            stroke-width: 8;
            stroke-linecap: round;
            transition: stroke-dashoffset 1s linear;
            filter: drop-shadow(0 0 6px rgba(0, 229, 255, 0.6));
        }

        .countdown-text {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: #ffffff;
        }

        .countdown-text .time-remaining {
            font-size: 42px;
            font-weight: 800;
            line-height: 1;
            color: #ffffff;
            text-shadow: 0 0 20px rgba(0, 229, 255, 0.5);
        }

        .countdown-text .time-label {
            font-size: 13px;
            color: #cbd5e1;
            margin-top: 4px;
        }

        @media (max-width: 640px) {
            .countdown-ring-container {
                width: 140px;
                height: 140px;
            }
            .countdown-ring {
                width: 140px;
                height: 140px;
            }
            .countdown-text .time-remaining {
                font-size: 32px;
            }
        }

        /* 卖点轮播 */
        .carousel-dots {
            display: flex;
            gap: 10px;
            justify-content: center;
            align-items: center;
        }

        .carousel-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.4);
            border: none;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .carousel-dot.active {
            background-color: var(--color-neon);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.7);
            width: 32px;
            border-radius: 6px;
        }

        .carousel-slide {
            animation: fadeInSlide 0.5s ease;
        }

        @keyframes fadeInSlide {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 霓虹发光按钮 */
        .btn-neon {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: var(--color-neon);
            font-weight: 700;
            font-size: 16px;
            border: 2px solid var(--color-neon);
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            letter-spacing: 0.5px;
        }

        .btn-neon:hover {
            background-color: var(--color-neon);
            color: #0f172a;
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.5), 0 0 60px rgba(0, 229, 255, 0.3);
            transform: translateY(-2px);
        }

        .btn-neon:active {
            transform: translateY(0);
            box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
        }

        .btn-primary-gradient {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
            color: #ffffff;
            font-weight: 700;
            font-size: 16px;
            border: none;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: all var(--transition-fast);
            letter-spacing: 0.5px;
        }

        .btn-primary-gradient:hover {
            background: linear-gradient(135deg, #3b82c4, var(--color-primary));
            box-shadow: 0 8px 25px rgba(43, 108, 176, 0.4);
            transform: translateY(-2px);
        }

        .btn-primary-gradient:active {
            transform: translateY(0);
        }

        /* 卡片悬停效果 */
        .card-hover {
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }

        .card-hover:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }

        /* 片库轨道横向滚动 */
        .track-scroll {
            display: flex;
            gap: 16px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 16px;
            scrollbar-width: thin;
            scrollbar-color: #cbd5e1 transparent;
        }

        .track-scroll::-webkit-scrollbar {
            height: 6px;
        }

        .track-scroll::-webkit-scrollbar-track {
            background: transparent;
        }

        .track-scroll::-webkit-scrollbar-thumb {
            background-color: #cbd5e1;
            border-radius: 3px;
        }

        .track-scroll>* {
            scroll-snap-align: start;
            flex-shrink: 0;
        }

        /* FAQ 手风琴 */
        .faq-item {
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: all var(--transition-fast);
            background-color: #ffffff;
        }

        .faq-item[open] {
            background-color: #f0f7ff;
            border-color: #b8d4f0;
        }

        .faq-item summary {
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 17px;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
            color: #1e293b;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background-color: #e8f0f8;
            color: var(--color-primary);
            font-size: 14px;
            transition: all var(--transition-fast);
        }

        .faq-item[open] summary .faq-icon {
            background-color: var(--color-primary);
            color: #ffffff;
            transform: rotate(45deg);
        }

        .faq-item .faq-answer {
            padding: 0 24px 20px;
            color: #475569;
            line-height: 1.7;
        }

        /* 表单输入发光 */
        .input-glow {
            border: 2px solid var(--color-border-light);
            border-radius: var(--radius-input);
            padding: 14px 18px;
            font-size: 16px;
            outline: none;
            transition: all var(--transition-fast);
            background-color: #ffffff;
            width: 100%;
        }

        .input-glow:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 4px rgba(43, 108, 176, 0.12);
        }

        /* 限时入口横幅 */
        .urgent-banner {
            background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
            border: 1px solid rgba(0, 229, 255, 0.3);
            border-radius: 12px;
            position: relative;
            overflow: hidden;
        }

        .urgent-banner::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 229, 255, 0.06) 0%, transparent 70%);
            animation: pulseGlow 3s ease-in-out infinite;
        }

        @keyframes pulseGlow {
            0%,
            100% {
                opacity: 0.5;
            }
            50% {
                opacity: 1;
            }
        }

        /* 对比表格样式 */
        .comparison-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--color-border-light);
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        /* 页脚 */
        .site-footer {
            background-color: var(--color-nav-bg);
            color: var(--color-footer-text);
            padding: 40px 0 30px;
        }

        .site-footer a {
            color: #cbd5e1;
            transition: color var(--transition-fast);
        }

        .site-footer a:hover {
            color: #ffffff;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .hero-title {
                font-size: 24px;
            }
            .hero-desc {
                font-size: 14px;
            }
        }

        @media (max-width: 640px) {
            .countdown-ring-container {
                width: 120px;
                height: 120px;
            }
            .countdown-ring {
                width: 120px;
                height: 120px;
            }
            .countdown-text .time-remaining {
                font-size: 28px;
            }
            .btn-neon,
            .btn-primary-gradient {
                padding: 12px 22px;
                font-size: 14px;
            }
        }