:root {
    --primary: #0071e3;
    --primary-gradient: linear-gradient(135deg, #0071e3 0%, #00c6ff 100%);
    --bg: #ffffff;
    --text: #1d1d1f;
    --glass: rgba(255, 255, 255, 0.85);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 20px 50px rgba(0, 71, 227, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

nav {
    height: 60px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
}

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

.logo {
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
}

.links a {
    text-decoration: none;
    color: var(--text);
    margin-left: 25px;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.links a:hover {
    opacity: 0.7;
}

.btn-sm {
    background: var(--primary);
    color: white !important;
    padding: 6px 16px;
    border-radius: 20px;
}

header {
    padding-top: 150px;
    padding-bottom: 100px;
    text-align: center;
    background: linear-gradient(180deg, #fff 0%, #f5f5f7 100%);
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 20px;
}

.subtitle {
    font-size: 1.5rem;
    color: #86868b;
    margin-bottom: 40px;
}

.btn-primary {
    display: inline-block;
    background: var(--primary-gradient);
    color: white;
    text-decoration: none;
    padding: 18px 40px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 10px 20px rgba(0, 113, 227, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(0, 113, 227, 0.3);
}

.hero-image {
    display: none; /* 移除冗余的预览图 */
}

/* Detailed Features Section */
.detailed-features {
    padding: 100px 0;
    background: #fff;
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 80px;
    margin-bottom: 120px;
}

.feature-row:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-text h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.feature-text p {
    font-size: 1.2rem;
    color: #6e6e73;
    margin-bottom: 25px;
}

.tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tag {
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

.tag-orange { background: #fff7ed; color: #ea580c; border: 1px solid #ffedd5; }
.tag-blue { background: #eff6ff; color: #2563eb; border: 1px solid #dbeafe; }

.feature-visual {
    flex: 1.2;
    background: #1c1c1e; /* 模拟深色模式界面背景 */
    padding: 10px;
    border-radius: 24px;
    box-shadow: 0 30px 60px -12px rgba(0,0,0,0.3);
    border: 1px solid #333;
    overflow: hidden;
}

.feature-visual img {
    width: 100%;
    border-radius: 16px;
    display: block;
    transition: transform 0.5s;
}

.feature-visual:hover img {
    transform: scale(1.02);
}

@media (max-width: 900px) {
    .feature-row, .feature-row:nth-child(even) {
        flex-direction: column;
        gap: 40px;
        text-align: center;
    }
    
    .feature-text h2 { font-size: 2rem; }
    .feature-visual { width: 100%; }
    .tags { justify-content: center; }
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    padding: 100px 0;
}

.feature-card {
    background: white;
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-hover-shadow);
    border-color: rgba(0, 113, 227, 0.2);
}

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

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.feature-card p {
    color: #6e6e73;
}

footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid rgba(0,0,0,0.1);
    color: #86868b;
    font-size: 0.9rem;
}

.footer-links {
    margin-top: 10px;
}

.footer-links a {
    color: var(--primary);
    text-decoration: none;
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-out forwards;
}

.fade-in-up {
    animation: fadeInUp 1s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .subtitle { font-size: 1.1rem; }
}
/* Blog Styles */
.blog-header {
    background: linear-gradient(135deg, #f5f5f7 0%, #e8e8ed 100%);
    padding: 120px 0 60px;
}

.blog-card {
    text-align: left !important;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.blog-card h3 {
    font-size: 1.8rem;
    line-height: 1.3;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.blog-card p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: #6e6e73;
}

.read-more {
    display: inline-flex;
    align-items: center;
    margin-top: 30px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.2s;
}

.read-more:hover {
    transform: translateX(5px);
}

.tag-green { background: #ecfdf5; color: #059669; border: 1px solid #d1fae5; }
.tag-blue { background: #eff6ff; color: #2563eb; border: 1px solid #dbeafe; }
.tag-orange { background: #fff7ed; color: #ea580c; border: 1px solid #ffedd5; }

.tags {
    margin-bottom: 20px;
}

.blog-content h2 { margin: 40px 0 20px; font-size: 1.8rem; }
.blog-content p { margin-bottom: 20px; color: #333; }
.blog-content ul { margin: 0 0 20px 20px; }
.blog-content li { margin-bottom: 10px; color: #333; }
.blog-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 20px;
    background: #f8f8f8;
    margin: 40px 0;
    font-style: italic;
    font-size: 1.1rem;
}

.active { font-weight: 700; color: var(--primary) !important; }

.latest-blog { background: #f9f9fb; padding: 100px 0; }