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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
}

/* 地球图标导航 */
.nav-bar {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

/* 语言选择器 */
.language-selector {
    position: fixed;
    top: 20px;
    right: 100px;
    z-index: 1000;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #2c3e50;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    min-width: 100px;
}

.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.lang-btn.active {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.lang-menu {
    position: absolute;
    top: 50px;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    min-width: 150px;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all 0.3s ease;
}

.lang-menu.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.lang-item {
    padding: 12px 20px;
    color: #2c3e50;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.lang-item:hover {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding-left: 30px;
}

.lang-item.active {
    background: rgba(79, 172, 254, 0.1);
    color: #4facfe;
    font-weight: 700;
}

.globe-btn {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.globe-btn:hover {
    transform: scale(1.1) rotate(20deg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.globe-btn.active {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.dropdown-menu {
    position: absolute;
    top: 70px;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    min-width: 160px;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all 0.3s ease;
}

.dropdown-menu.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.dropdown-item {
    display: block;
    padding: 15px 20px;
    color: #2c3e50;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.dropdown-item:hover {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding-left: 30px;
}

.header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInDown 0.8s ease-out;
}

.header h1 {
    font-size: 3.5rem;
    color: #fff;
    margin-bottom: 15px;
    font-weight: 700;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header .subtitle {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 300;
}

.hero-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 50px;
    margin-bottom: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: fadeIn 1s ease-out;
}

.hero-section h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 30px;
    text-align: center;
}

.badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.badge {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.badge:hover {
    transform: translateY(-3px);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 35px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: 600;
}

.feature-card p {
    color: #666;
    line-height: 1.8;
    font-size: 1rem;
}

.section {
    background: white;
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 1s ease-out;
}

.section h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #4facfe;
    display: inline-block;
}

.section h3 {
    font-size: 1.3rem;
    color: #34495e;
    margin: 25px 0 15px;
    font-weight: 600;
}

.section p, .section li {
    color: #555;
    line-height: 1.9;
    font-size: 1.05rem;
    margin-bottom: 12px;
}

.section ul {
    list-style: none;
    padding-left: 0;
}

.section li {
    padding-left: 30px;
    position: relative;
    margin-bottom: 15px;
}

.section li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4facfe;
    font-weight: bold;
    font-size: 1.3rem;
}

.steps {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 250px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease;
}

.step:hover {
    transform: scale(1.05);
}

.step-number {
    background: #4facfe;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: bold;
    margin: 0 auto 15px;
}

.step p {
    color: #2c3e50;
    font-weight: 500;
}

.privacy-highlight {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    padding: 30px;
    border-radius: 12px;
    margin-top: 20px;
    border-left: 5px solid #4facfe;
}

.privacy-highlight p {
    color: #2c3e50;
    font-weight: 500;
    font-size: 1.1rem;
}

.footer {
    text-align: center;
    padding: 30px;
    color: white;
    font-size: 0.95rem;
    margin-top: 40px;
}

.accordion-item {
    margin-bottom: 15px;
}

.accordion-header {
    background: #4facfe;
    color: white;
    padding: 18px 25px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.accordion-header:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
}

.accordion-icon {
    transition: transform 0.3s ease;
}

.accordion-icon.open {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: #f8f9fa;
    border-radius: 0 0 10px 10px;
}

.accordion-content.open {
    max-height: 1000px;
    padding: 20px 25px;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

/* 响应式设计 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2.5rem;
    }

    .header .subtitle {
        font-size: 1.1rem;
    }

    .hero-section, .section {
        padding: 30px 20px;
    }

    .feature-card {
        padding: 25px;
    }

    .steps {
        flex-direction: column;
    }

    .nav-bar {
        top: 15px;
        right: 15px;
    }

    .globe-btn {
        width: 50px;
        height: 50px;
        font-size: 1.6rem;
    }

    .language-selector {
        top: 15px;
        right: 75px;
    }

    .lang-btn {
        padding: 10px 15px;
        font-size: 0.85rem;
        min-width: 80px;
    }

    .lang-menu {
        min-width: 120px;
    }

    .lang-item {
        padding: 10px 15px;
        font-size: 0.85rem;
    }
}