:root {
    --primary-blue: #0066cc;
    --light-blue: #e6f0ff;
    --dark-blue: #004c99;
    --text-main: #333;
    --text-sub: #666;
    --bg-gray: #f5f7fa;
    --white: #fff;
    --shadow: 0 10px 30px rgba(0, 102, 204, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--white);
    line-height: 1.5;
}

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

/* 按钮 */
.btn {
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-blue);
    color: var(--primary-blue);
}

.btn-outline:hover {
    background: var(--light-blue);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 14px;
}

.btn-lg {
    padding: 12px 36px;
    font-size: 18px;
    width: 200px;
}

/* Header */
.header {
    height: 70px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-box {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    height: 40px;
}

.app-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
}

/* Hero */
.hero {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8fbff 0%, #fff 100%);
    overflow: hidden;
}

.hero-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-text {
    flex: 1;
    z-index: 2;
}

.hero-text h1 {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 20px;
}

.blue-text {
    color: var(--primary-blue);
}

.hero-text p {
    font-size: 18px;
    color: var(--text-sub);
    margin-bottom: 40px;
}

.safe-badge {
    margin-top: 20px;
    font-size: 14px;
    color: #27ae60;
    display: flex;
    align-items: center;
    gap: 5px;
}

.hero-img {
    flex: 1;
    position: relative;
    display: flex;
    justify-content: center;
}

.phone-frame {
    width: 280px;
    height: 580px;
    background: #000;
    border-radius: 40px;
    border: 10px solid #333;
    overflow: hidden;
    position: relative;
    z-index: 2;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}

.carousel {
    width: 100%;
    height: 100%;
}

.carousel-inner {
    width: 100%;
    height: 100%;
    position: relative;
}

.carousel-inner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.carousel-inner img.active {
    opacity: 1;
}

/* Decor */
.circle-bg {
    position: absolute;
    width: 500px;
    height: 500px;
    background: var(--light-blue);
    border-radius: 50%;
    z-index: 1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.floating-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--white);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: var(--primary-blue);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    z-index: 3;
    animation: float 6s ease-in-out infinite;
}

.icon-1 { top: 10%; right: 10%; animation-delay: 0s; }
.icon-2 { bottom: 15%; left: 10%; animation-delay: 2s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Features */
.features {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    margin-bottom: 10px;
}

.section-title p {
    color: var(--text-sub);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #eee;
}

.feature-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-5px);
    border-color: var(--primary-blue);
}

.icon-wrap {
    width: 70px;
    height: 70px;
    background: var(--light-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--primary-blue);
    margin: 0 auto 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-sub);
}

/* Scenes */
.scenes {
    padding: 60px 0 80px;
}

.scene-box {
    background: var(--dark-blue);
    border-radius: 30px;
    padding: 60px;
    color: var(--white);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.scene-text {
    z-index: 2;
    max-width: 600px;
}

.scene-text h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.scene-text p {
    margin-bottom: 30px;
    opacity: 0.9;
}

.scene-text .btn-outline {
    color: var(--white);
    border-color: var(--white);
}

.scene-text .btn-outline:hover {
    background: var(--white);
    color: var(--dark-blue);
}

.scene-tags {
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    z-index: 2;
}

.scene-tags span {
    background: rgba(255,255,255,0.1);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    border: 1px solid rgba(255,255,255,0.2);
}

/* Footer */
.footer {
    background: #333;
    color: #999;
    padding: 30px 0;
    text-align: center;
    font-size: 12px;
}

/* Responsive */
@media (max-width: 900px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-box {
        flex-direction: column;
        text-align: center;
    }

    .hero-text h1 {
        font-size: 36px;
    }

    .hero-btns {
        display: flex;
        justify-content: center;
    }

    .safe-badge {
        justify-content: center;
    }

    .circle-bg {
        width: 300px;
        height: 300px;
    }

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

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

    .scene-box {
        padding: 40px 20px;
    }
}