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

:root {
    --apple-blue: #0071e3;
    --apple-gray: #f5f5f7;
    --apple-text: #1d1d1f;
    --apple-text-secondary: #86868b;
    --apple-card-bg: rgba(255, 255, 255, 0.8);
    --apple-border: rgba(0, 0, 0, 0.1);
    --apple-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.47059;
    font-weight: 400;
    color: var(--apple-text);
    background-color: var(--apple-gray);
    letter-spacing: -0.022em;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}

/* Header - 苹果磨砂导航栏 */
.header {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--apple-border);
    color: var(--apple-text);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 21px;
    font-weight: 600;
    color: var(--apple-text);
}

.nav a {
    color: var(--apple-text);
    text-decoration: none;
    margin-left: 32px;
    font-size: 14px;
    font-weight: 400;
    transition: color 0.2s ease;
}

.nav a:hover {
    color: var(--apple-blue);
}

.nav a.active {
    color: var(--apple-blue);
    font-weight: 500;
}

/* Hero Section */
.hero {
    background: #fff;
    padding: 120px 0 80px 0;
    text-align: center;
    border-bottom: 1px solid var(--apple-border);
}

.hero h2 {
    font-size: 56px;
    line-height: 1.07143;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--apple-text);
}

.hero p {
    font-size: 28px;
    line-height: 1.14286;
    font-weight: 400;
    color: var(--apple-text-secondary);
    max-width: 670px;
    margin: 0 auto;
}

/* Section */
.section {
    padding: 80px 0;
}

.section h2 {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 600;
    margin-bottom: 64px;
    text-align: center;
    color: var(--apple-text);
}

/* Strategy Card - 苹果风格卡片 */
.strategy-card {
    background: var(--apple-card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 32px;
    border-radius: 18px;
    box-shadow: var(--apple-shadow);
    border: 1px solid var(--apple-border);
    max-width: 760px;
    margin: 0 auto 24px auto;
    transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.strategy-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.strategy-card h3 {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--apple-blue);
    display: flex;
    align-items: center;
    gap: 8px;
}

.strategy-card p {
    font-size: 17px;
    line-height: 1.47059;
    color: var(--apple-text-secondary);
    font-weight: 400;
}

/* About Section */
#about p {
    text-align: center;
    font-size: 21px;
    line-height: 1.381;
    color: var(--apple-text-secondary);
    max-width: 640px;
    margin: 0 auto;
}

/* Footer */
.footer {
    background-color: #fff;
    border-top: 1px solid var(--apple-border);
    color: var(--apple-text-secondary);
    text-align: center;
    padding: 32px 0;
    font-size: 14px;
    margin-top: 80px;
}

/* Responsive */
@media (max-width: 734px) {
    .hero h2 {
        font-size: 40px;
    }
    
    .hero p {
        font-size: 21px;
    }
    
    .section h2 {
        font-size: 32px;
    }
    
    .nav a {
        margin-left: 16px;
        font-size: 12px;
    }
}