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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8fafc;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 1000;
    padding: 1rem 2rem;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: bold;
    color: #1e293b;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: #64748b;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #1e293b;
}

.btn-primary {
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(6, 182, 212, 0.3);
}

.hero {
    margin-top: 80px;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-content .highlight {
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.25rem;
    color: #cbd5e1;
    margin-bottom: 2rem;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(6, 182, 212, 0.2);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: 20px;
    color: #06b6d4;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-secondary {
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: white;
    text-decoration: none;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-card {
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: bold;
    color: #06b6d4;
    margin-bottom: 0.5rem;
}

.stat-card .label {
    font-size: 0.875rem;
    color: #cbd5e1;
}

section {
    padding: 5rem 2rem;
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.section-header p {
    font-size: 1.25rem;
    color: #64748b;
}

.platforms-section {
    background: white;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.platform-card {
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 20px;
    border: 2px solid #e2e8f0;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: #06b6d4;
}

.platform-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.platform-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: #1e293b;
}

.platform-card p {
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.download-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.download-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(6, 182, 212, 0.4);
}

.qr-code {
    width: 120px;
    height: 120px;
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    margin: 1.5rem auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: #94a3b8;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.advantage-card {
    padding: 2rem;
    background: white;
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s, box-shadow 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.advantage-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.advantage-card p {
    color: #64748b;
    line-height: 1.8;
}

.challenges-section {
    background: #f1f5f9;
}

.challenge-card {
    padding: 2rem;
    background: white;
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.challenge-icon {
    width: 56px;
    height: 56px;
    background: #fee2e2;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: #dc2626;
    margin-bottom: 1.5rem;
}

.challenge-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.challenge-card .description {
    color: #64748b;
    margin-bottom: 1.5rem;
}

.solution {
    padding-top: 1.5rem;
    border-top: 1px solid #e2e8f0;
    display: flex;
    gap: 0.75rem;
}

.solution .icon {
    color: #10b981;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.solution p {
    color: #475569;
    font-size: 0.875rem;
}

.solution strong {
    color: #1e293b;
}

.cta-section {
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: white;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.cta-section p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-white {
    padding: 1rem 2rem;
    background: white;
    color: #3b82f6;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* 模态框样式 */
.modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal[aria-hidden="false"] {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000; /* 放在 dialog 下面 */
}

.modal-dialog {
    position: relative;
    background: white;
    color: #0f172a; /* 深色文字，保证可见 */
    padding: 2rem;
    border-radius: 12px;
    width: 320px;
    max-width: calc(100% - 2rem);
    box-shadow: 0 20px 60px rgba(2,6,23,0.4);
    z-index: 2002; /* 明确高于 backdrop */
    text-align: center;
}

.modal-close {
    position: absolute;
    top: 8px;
    right: 8px;
    border: none;
    background: transparent;
    font-size: 1.25rem;
    cursor: pointer;
    color: #374151;
}

/* 确保链接在白底上有合适颜色 */
.modal-dialog a {
    color: #0369a1;
    text-decoration: underline;
}

.modal-dialog p {
    font-size:0.9rem;
    color:#64748b;
    margin-top:0.5rem;
    margin-bottom:0.5rem;
}

.wechat-qr img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    margin: 1rem auto;
}

footer {
    padding: 3rem 2rem;
    background: #1e293b;
    color: #94a3b8;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.footer-logo span {
    font-size: 1.125rem;
    font-weight: bold;
    color: white;
}

.btn-hero {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: white;
    text-decoration: none;
    display: inline-block;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-container {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

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

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