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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background: #fafafa;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 80px;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.logo-text {
    font-size: 20px;
    font-weight: 800;
    color: #1a1a1a;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: #555;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #ffd400;
}

.nav-download {
    background: #ffd400;
    color: #1a1a1a;
    padding: 10px 24px;
    border-radius: 24px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 700;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(255, 212, 0, 0.3);
}

.nav-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 212, 0, 0.4);
}

.hero {
    background: linear-gradient(135deg, #ffd400 0%, #ffed4e 50%, #ffd400 100%);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 1;
    gap: 60px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: #1a1a1a;
    color: #ffd400;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    color: #1a1a1a;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero-sub {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin-top: 8px;
}

.hero-desc {
    font-size: 18px;
    color: #444;
    margin-bottom: 24px;
    font-weight: 500;
}

.hero-info {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.info-label {
    font-size: 13px;
    color: #666;
}

.info-value {
    font-size: 16px;
    font-weight: 700;
    color: #1a1a1a;
}

.info-divider {
    width: 1px;
    height: 36px;
    background: rgba(0, 0, 0, 0.1);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 700;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: #1a1a1a;
    color: #ffd400;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.btn-secondary {
    background: #fff;
    color: #1a1a1a;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.btn-icon {
    font-size: 20px;
}

.hero-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.tag {
    background: rgba(26, 26, 26, 0.1);
    color: #1a1a1a;
    padding: 6px 14px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 600;
}

.hero-qr {
    flex-shrink: 0;
}

.qr-card {
    background: #fff;
    padding: 24px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    text-align: center;
    width: 220px;
}

.qr-title {
    font-size: 16px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.qr-img {
    width: 160px;
    height: 160px;
    border-radius: 12px;
    margin-bottom: 12px;
    background: #f5f5f5;
}

.qr-desc {
    font-size: 13px;
    color: #666;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 4px;
    background: #ffd400;
    border-radius: 2px;
}

.section-desc {
    font-size: 16px;
    color: #666;
    margin-top: 20px;
}

.features {
    padding: 80px 0;
    background: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: #fafafa;
    border-radius: 20px;
    padding: 32px 28px;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: #ffd400;
    box-shadow: 0 12px 32px rgba(255, 212, 0, 0.2);
    background: #fff;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 15px;
    color: #666;
    line-height: 1.7;
}

.screens {
    padding: 80px 0;
    background: #1a1a1a;
}

.screens .section-title {
    color: #fff;
}

.screens .section-title::after {
    background: #ffd400;
}

.screens .section-desc {
    color: #999;
}

.screens-wrapper {
    overflow: hidden;
}

.screens-track {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.screen-item {
    text-align: center;
}

.screen-img {
    width: 200px;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    margin-bottom: 16px;
}

.screen-name {
    color: #ffd400;
    font-size: 15px;
    font-weight: 600;
}

.intro {
    padding: 80px 0;
    background: #fff;
}

.intro-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.intro-title {
    font-size: 32px;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 24px;
    text-align: center;
}

.intro-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a1a;
    margin-top: 28px;
    margin-bottom: 12px;
    padding-left: 14px;
    border-left: 4px solid #ffd400;
}

.intro-content p {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 14px;
}

.intro-content strong {
    color: #1a1a1a;
    font-weight: 700;
}

.install {
    padding: 80px 0;
    background: #fafafa;
}

.install-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.step-item {
    background: #fff;
    border-radius: 20px;
    padding: 32px 28px;
    flex: 1;
    max-width: 320px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    transition: all 0.3s;
}

.step-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #ffd400, #ffed4e);
    color: #1a1a1a;
    border-radius: 50%;
    font-size: 24px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.step-title {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.step-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.7;
}

.step-arrow {
    font-size: 28px;
    color: #ffd400;
    font-weight: 700;
    align-self: center;
    flex-shrink: 0;
}

.faq {
    padding: 80px 0;
    background: #fff;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: #fafafa;
    border-radius: 16px;
    padding: 24px 28px;
    margin-bottom: 16px;
    transition: all 0.3s;
    border-left: 4px solid #ffd400;
}

.faq-item:hover {
    background: #fff;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.faq-question {
    font-size: 17px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
}

.faq-answer {
    font-size: 15px;
    color: #555;
    line-height: 1.8;
}

.tags-section {
    padding: 80px 0;
    background: #fafafa;
}

.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    max-width: 900px;
    margin: 0 auto;
}

.tag-item {
    display: inline-block;
    padding: 10px 20px;
    background: #fff;
    color: #555;
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    border: 1px solid #eee;
}

.tag-item:hover {
    background: #ffd400;
    color: #1a1a1a;
    border-color: #ffd400;
    transform: translateY(-2px);
}

.about {
    padding: 80px 0;
    background: #fff;
}

.about-wrapper {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-title {
    font-size: 32px;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 24px;
}

.about-wrapper p {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-wrapper strong {
    color: #1a1a1a;
    font-weight: 700;
}

.footer {
    background: #1a1a1a;
    padding: 60px 0 30px;
    color: #999;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 24px;
}

.footer-logo-img {
    width: 44px;
    height: 44px;
    border-radius: 10px;
}

.footer-logo-text {
    font-size: 20px;
    font-weight: 700;
    color: #ffd400;
}

.footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #999;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #ffd400;
}

.footer-copyright {
    font-size: 14px;
    margin-bottom: 8px;
}

.footer-email {
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-statement {
    font-size: 12px;
    color: #666;
    margin-top: 16px;
    line-height: 1.6;
}

.mobile-download {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: none;
}

.mobile-download-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
    gap: 16px;
}

.mobile-download-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.mobile-download-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    flex-shrink: 0;
}

.mobile-download-text {
    min-width: 0;
}

.mobile-download-title {
    font-size: 15px;
    font-weight: 700;
    color: #1a1a1a;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mobile-download-desc {
    font-size: 12px;
    color: #999;
    margin-top: 2px;
}

.mobile-download-btn {
    background: linear-gradient(135deg, #ffd400, #ffed4e);
    color: #1a1a1a;
    padding: 12px 28px;
    border-radius: 24px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(255, 212, 0, 0.4);
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-info {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-tags {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .step-arrow {
        display: none;
    }

    .install-steps {
        flex-direction: column;
        align-items: center;
    }

    .step-item {
        max-width: 100%;
        width: 100%;
    }
}

@media (max-width: 768px) {
    body {
        padding-bottom: 72px;
    }

    .nav-download {
        padding: 8px 18px;
        font-size: 13px;
    }

    .hero {
        padding: 90px 0 50px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-sub {
        font-size: 18px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .hero-info {
        padding: 12px 16px;
        gap: 16px;
    }

    .info-value {
        font-size: 14px;
    }

    .btn {
        padding: 14px 26px;
        font-size: 15px;
    }

    .section-title {
        font-size: 28px;
    }

    .features {
        padding: 60px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 24px 20px;
    }

    .screens {
        padding: 60px 0;
    }

    .screen-img {
        width: 160px;
    }

    .intro {
        padding: 60px 0;
    }

    .intro-title {
        font-size: 26px;
    }

    .intro-content h3 {
        font-size: 18px;
    }

    .install {
        padding: 60px 0;
    }

    .faq {
        padding: 60px 0;
    }

    .faq-item {
        padding: 20px;
    }

    .faq-question {
        font-size: 16px;
    }

    .tags-section {
        padding: 60px 0;
    }

    .about {
        padding: 60px 0;
    }

    .about-title {
        font-size: 26px;
    }

    .footer {
        padding: 40px 0 100px;
    }

    .mobile-download {
        display: block;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 16px;
        height: 56px;
    }

    .logo-img {
        width: 36px;
        height: 36px;
    }

    .logo-text {
        font-size: 18px;
    }

    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 80px 0 40px;
    }

    .hero-title {
        font-size: 30px;
    }

    .hero-sub {
        font-size: 16px;
    }

    .hero-desc {
        font-size: 14px;
    }

    .hero-info {
        gap: 12px;
    }

    .info-label {
        font-size: 12px;
    }

    .info-value {
        font-size: 13px;
    }

    .btn {
        padding: 12px 22px;
        font-size: 14px;
    }

    .section-title {
        font-size: 24px;
    }

    .section-desc {
        font-size: 14px;
    }

    .qr-card {
        width: 180px;
        padding: 18px;
    }

    .qr-img {
        width: 130px;
        height: 130px;
    }
}