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

:root {
    --primary-color: #4A90E2;
    --primary-dark: #357ABD;
    --secondary-color: #7B68EE;
    --accent-color: #FF6B6B;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo-icon {
    font-size: 28px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
    border-radius: 2px;
}

.hero {
    margin-top: 70px;
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    animation: fadeInLeft 0.8s ease;
}

.hero-title {
    font-size: 56px;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-slogan {
    font-size: 32px;
    margin-bottom: 15px;
    opacity: 0.95;
}

.hero-desc {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow);
}

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

.btn-download {
    background: var(--primary-color);
    color: white;
    width: 100%;
    display: inline-block;
    text-align: center;
    text-decoration: none;
    border: none;
    font-size: 16px;
    font-weight: bold;
    padding: 15px 40px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-download:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

.btn-download:disabled {
    background: #BDC3C7;
    cursor: not-allowed;
    opacity: 0.7;
    transform: none;
}

.hero-image {
    display: flex;
    justify-content: center;
    animation: fadeInRight 0.8s ease;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 30px;
    overflow: hidden;
}

.screen-content {
    padding: 20px;
    height: 100%;
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

.screen-header {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.screen-items {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.screen-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.screen-item .time {
    font-weight: bold;
    color: var(--primary-color);
    min-width: 50px;
}

.screen-item .event {
    color: var(--text-dark);
}

.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 50px;
}

.features {
    padding: 80px 0;
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-desc {
    color: var(--text-light);
    line-height: 1.8;
}

.mini-apps {
    padding: 80px 0;
    background: white;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.app-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 35px 25px;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.app-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

.app-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.app-title {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.app-desc {
    color: var(--text-light);
    font-size: 14px;
}

.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.download .section-title,
.download .section-subtitle {
    color: white;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.download-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    min-width: 280px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.download-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.download-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.download-title {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.download-status {
    color: var(--accent-color);
    font-size: 16px;
    margin-bottom: 20px;
    font-weight: bold;
}

.contact {
    padding: 80px 0;
    background: var(--bg-light);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #eee;
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-label {
    font-weight: bold;
    color: var(--text-dark);
}

.contact-value {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.contact-value:hover {
    text-decoration: underline;
}

.footer {
    background: var(--text-dark);
    color: white;
    padding: 30px 0;
    text-align: center;
}

.copyright {
    opacity: 0.8;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero {
        padding: 60px 0;
        min-height: auto;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-slogan {
        font-size: 24px;
    }

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

    .phone-mockup {
        width: 240px;
        height: 480px;
    }

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

    .section-subtitle {
        font-size: 16px;
    }

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

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

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-card {
        width: 100%;
        max-width: 320px;
    }

    .contact-item {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-slogan {
        font-size: 20px;
    }

    .btn {
        padding: 12px 30px;
        font-size: 14px;
    }

    .apps-grid {
        grid-template-columns: 1fr;
    }

    .phone-mockup {
        width: 200px;
        height: 400px;
    }

    .screen-content {
        padding: 15px;
    }

    .screen-header {
        font-size: 16px;
    }

    .screen-item {
        padding: 10px;
    }

    .screen-item .time {
        font-size: 14px;
    }

    .screen-item .event {
        font-size: 14px;
    }
}