:root {
        --bg-color: #F6F3EE;
        --card-bg: #FFFFFF;
        --primary-orange: #FF7A00;
        --pressed-orange: #E56600;
        --text-main: #333333;
        --text-light: #666666;
        --border-color: #EEEEEE;
        --teal-green: #00BFA5;
    }

    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        -webkit-tap-highlight-color: transparent;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        background-color: var(--bg-color);
        color: var(--text-main);
        line-height: 1.5;
        padding-bottom: 70px; /* 避让底部悬浮栏 */
    }

    @media (min-width: 880px) {
        body { padding-bottom: 0; }
    }

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

    .container {
        max-width: 1000px;
        margin: 0 auto;
        padding: 0 16px;
    }

    section {
        scroll-margin-top: 72px;
        padding: 40px 0;
    }

    h1 {
        font-size: 32px;
        line-height: 1.3;
        margin-bottom: 12px;
    }
    
    h2 {
        font-size: 24px;
        margin-bottom: 24px;
        text-align: center;
    }

    .highlight { color: var(--primary-orange); }

    /* 按钮通用 */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 50px;
        border-radius: 16px;
        font-weight: bold;
        font-size: 16px;
        cursor: pointer;
        transition: transform 0.1s, background-color 0.2s;
        border: none;
    }
    .btn:active {
        transform: scale(0.94);
    }
    .btn-primary {
        background-color: var(--primary-orange);
        color: #fff;
    }
    .btn-primary:active { background-color: var(--pressed-orange); }
    
    .btn-outline {
        background-color: #fff;
        color: var(--primary-orange);
        border: 2px solid var(--primary-orange);
    }

    /* 导航条 */
    .navbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 64px;
        background-color: #fff;
        border-bottom: 2px solid var(--border-color);
        z-index: 100;
        display: flex;
        align-items: center;
    }
    
    .nav-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        max-width: 1000px;
        margin: 0 auto;
        padding: 0 16px;
    }

    .logo-area {
        display: flex;
        align-items: center;
        font-size: 23px;
        font-weight: 800;
        flex-shrink: 0;
    }
    .logo-area img {
        height: 32px;
        border-radius: 6px;
        margin-right: 8px;
    }
    .logo-area .tv { color: var(--primary-orange); }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 20px;
        overflow-x: auto;
        white-space: nowrap;
        margin: 0 16px;
        scrollbar-width: none;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    
    .nav-links a {
        font-size: 15px;
        font-weight: bold;
        color: var(--text-main);
        transition: color 0.2s;
    }
    .nav-links a:hover { color: var(--primary-orange); }

    .nav-download-btn {
        min-height: 40px;
        padding: 0 20px;
        font-size: 15px;
        border-radius: 12px;
    }

    /* 首屏 */
    #home {
        background-color: #fff;
        padding-top: 90px;
        border-bottom: 6px solid var(--primary-orange);
    }
    
    .hero-grid {
        display: flex;
        flex-direction: column;
        gap: 32px;
    }
    @media (min-width: 880px) {
        .hero-grid { flex-direction: row; align-items: center; }
        .hero-text { flex: 1; }
        .hero-visual { flex: 1; }
    }

    .hero-sub {
        font-size: 18px;
        color: var(--text-light);
        margin-bottom: 24px;
    }

    .hero-promises {
        list-style: none;
        margin-bottom: 32px;
    }
    .hero-promises li {
        display: flex;
        align-items: center;
        font-size: 16px;
        margin-bottom: 12px;
    }
    .check-icon {
        width: 20px;
        height: 20px;
        background-color: var(--teal-green);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-right: 12px;
        flex-shrink: 0;
    }
    .check-icon svg {
        width: 12px;
        height: 12px;
        fill: none;
        stroke: #fff;
        stroke-width: 2;
        stroke-linecap: round;
        stroke-linejoin: round;
    }

    .hero-btns {
        display: flex;
        gap: 16px;
        margin-bottom: 12px;
    }
    .hero-btns .btn { flex: 1; }
    
    .hero-note {
        font-size: 13px;
        color: #999;
    }

    .hero-visual {
        background-color: #FFF3E0;
        border-radius: 26px;
        padding: 20px;
    }
    .mockup-row {
        background: #fff;
        border-radius: 16px;
        padding: 16px;
        display: flex;
        align-items: center;
        margin-bottom: 12px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }
    .mockup-row:last-child { margin-bottom: 0; }
    .mockup-icon {
        width: 40px;
        height: 40px;
        margin-right: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .mockup-icon svg { width: 28px; height: 28px; stroke: var(--primary-orange); fill: none; stroke-width: 2; }
    .mockup-text { flex: 1; }
    .mockup-title { font-weight: bold; font-size: 16px; margin-bottom: 2px; }
    .mockup-desc { font-size: 13px; color: var(--text-light); }
    .mockup-pill {
        background: #FFF3E0;
        color: var(--primary-orange);
        padding: 4px 10px;
        border-radius: 20px;
        font-size: 12px;
        font-weight: bold;
    }

    /* 功能速览 */
    .features-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 16px;
    }
    @media (min-width: 768px) {
        .features-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (min-width: 1024px) {
        .features-grid { grid-template-columns: repeat(4, 1fr); }
    }
    .feature-card {
        background: var(--card-bg);
        border: 3px solid var(--border-color);
        border-radius: 16px;
        padding: 24px;
    }
    .feature-card h3 {
        font-size: 20px;
        margin-bottom: 12px;
    }
    .feature-card p {
        font-size: 15px;
        color: var(--text-light);
    }

    /* 片库速览 */
    .library-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 16px;
    }
    .media-card {
        background: var(--card-bg);
        border-radius: 16px;
        overflow: hidden;
        box-shadow: 0 4px 12px rgba(0,0,0,0.04);
        display: flex;
        flex-direction: column;
    }
    .media-card img {
        width: 100%;
        aspect-ratio: 3/4;
        object-fit: cover;
        background-color: #eee;
    }
    .card-info {
        padding: 12px;
        flex: 1;
        display: flex;
        flex-direction: column;
    }
    .card-title {
        font-weight: bold;
        font-size: 16px;
        margin-bottom: 4px;
    }
    .card-desc {
        font-size: 12px;
        color: var(--text-light);
        margin-bottom: 12px;
        flex: 1;
    }
    .card-btn {
        width: 100%;
        min-height: 40px;
        font-size: 14px;
        border-radius: 20px;
    }

    /* 精彩画面 */
    .scenes-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 24px;
    }
    @media (min-width: 880px) {
        .scenes-grid { grid-template-columns: repeat(2, 1fr); }
    }
    .scene-card {
        background: var(--card-bg);
        border-radius: 16px;
        overflow: hidden;
        box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .scene-img-wrap {
        position: relative;
        width: 100%;
        aspect-ratio: 16/9;
    }
    .scene-img-wrap img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }
    .scene-tag {
        position: absolute;
        top: 12px;
        left: 12px;
        background: var(--primary-orange);
        color: #fff;
        padding: 4px 12px;
        border-radius: 8px;
        font-size: 13px;
        font-weight: bold;
    }
    .scene-info {
        padding: 16px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
    }
    .scene-info h3 {
        font-size: 18px;
        margin-bottom: 4px;
    }
    .scene-info p {
        font-size: 14px;
        color: var(--text-light);
    }
    .scene-btn {
        min-height: 44px;
        padding: 0 20px;
        font-size: 15px;
        border-radius: 12px;
    }

    /* 界面预览 */
    .ui-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 24px;
    }
    @media (min-width: 768px) {
        .ui-grid { grid-template-columns: repeat(3, 1fr); }
    }
    .ui-card {
        background: var(--card-bg);
        border-radius: 16px;
        overflow: hidden;
        box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .ui-card img {
        width: 100%;
        height: auto;
        display: block;
    }
    .ui-card p {
        padding: 16px;
        font-size: 15px;
        font-weight: bold;
        text-align: center;
    }

    /* 用户口碑 */
    .reviews-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 16px;
    }
    @media (min-width: 768px) {
        .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    }
    .review-card {
        background: var(--card-bg);
        border-radius: 16px;
        padding: 24px;
    }
    .stars {
        color: var(--primary-orange);
        font-size: 18px;
        margin-bottom: 12px;
    }
    .review-text {
        font-size: 15px;
        line-height: 1.6;
        margin-bottom: 16px;
    }
    .review-user {
        font-size: 13px;
        color: #999;
    }

    /* 常见问题 */
    .faq-list {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .faq-item {
        background: var(--card-bg);
        border-radius: 16px;
        overflow: hidden;
    }
    .faq-q {
        padding: 20px;
        font-size: 16px;
        font-weight: bold;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .faq-icon {
        width: 20px;
        height: 20px;
        position: relative;
    }
    .faq-icon::before, .faq-icon::after {
        content: '';
        position: absolute;
        background: var(--text-main);
        transition: transform 0.3s;
    }
    .faq-icon::before { top: 9px; left: 0; width: 20px; height: 2px; }
    .faq-icon::after { top: 0; left: 9px; width: 2px; height: 20px; }
    
    .faq-a {
        padding: 0 20px 20px;
        font-size: 15px;
        color: var(--text-light);
        display: none;
    }
    .faq-item.active .faq-a {
        display: block;
    }
    .faq-item.active .faq-icon::after {
        transform: rotate(90deg);
    }

    /* 下载区 */
    .download-banner {
        background: linear-gradient(135deg, #FF9800, var(--primary-orange));
        border-radius: 16px;
        padding: 24px;
        color: #fff;
        display: flex;
        flex-direction: column;
        gap: 16px;
        margin-bottom: 24px;
    }
    @media (min-width: 768px) {
        .download-banner {
            flex-direction: row;
            align-items: center;
            justify-content: space-between;
            padding: 32px;
        }
    }
    .banner-text h2 {
        font-size: 22px;
        margin-bottom: 8px;
        text-align: left;
    }
    .banner-text p {
        font-size: 15px;
    }
    .banner-btn {
        background: #fff;
        color: var(--primary-orange);
        padding: 0 32px;
        border-radius: 50px;
    }

    .download-card {
        background: var(--card-bg);
        border: 3px solid var(--primary-orange);
        border-radius: 24px;
        padding: 32px 16px;
        text-align: center;
    }
    .download-card h2 {
        margin-bottom: 12px;
    }
    .download-card p {
        font-size: 15px;
        color: var(--text-light);
        margin-bottom: 24px;
    }
    .dl-btns {
        display: flex;
        flex-direction: column;
        gap: 12px;
        max-width: 400px;
        margin: 0 auto 20px;
    }
    @media (min-width: 768px) {
        .dl-btns { flex-direction: row; justify-content: center; }
    }
    .dl-btns .btn {
        width: 100%;
    }
    @media (min-width: 768px) {
        .dl-btns .btn { width: auto; padding: 0 24px; }
    }
    .dl-meta {
        font-size: 12px;
        color: #999;
    }

    /* 页脚 */
    footer {
        background: #fff;
        padding: 40px 16px;
        text-align: center;
        font-size: 13px;
        color: #999;
        border-top: 1px solid var(--border-color);
        margin-top: 40px;
    }
    footer p { margin-bottom: 8px; }
    footer a { color: #999; }
    
    /* 移动端底部悬浮条 */
    .mobile-fixed-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
        padding: 10px 16px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        z-index: 100;
    }
    @media (min-width: 880px) {
        .mobile-fixed-bar { display: none; }
    }
    .fixed-bar-text {
        font-size: 14px;
        font-weight: bold;
    }
    .fixed-bar-btn {
        min-height: 44px;
        padding: 0 24px;
        border-radius: 12px;
    }

    /* 动效降级 */
    @media (prefers-reduced-motion: reduce) {
        html { scroll-behavior: auto; }
        .btn:active { transform: none; }
    }