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

:root {
    /* 主色调 - 蓝紫渐变 */
    --primary-start: #6366f1;
    --primary-end: #8b5cf6;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    
    /* 中性色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 60px 48px 40px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

/* Hero Section - 紧凑的一屏布局 */
.hero {
    text-align: center;
    margin-bottom: 48px;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: 900px;
    flex-shrink: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 28px;
}

.logo {
    font-size: 64px;
    display: inline-block;
    filter: drop-shadow(0 8px 24px rgba(99, 102, 241, 0.25));
    animation: float 6s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Logo 光晕效果 */
.logo-wrapper::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: var(--primary-gradient);
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(40px);
    z-index: 1;
}

h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -1.5px;
    line-height: 1.15;
    background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 19px;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
    letter-spacing: -0.2px;
}

/* Features Grid - 紧凑的三列布局 */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 0 0 48px 0;
    width: 100%;
    max-width: 1100px;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
    flex-shrink: 0;
}

.feature {
    padding: 32px 24px;
    background: var(--bg-primary);
    border-radius: 18px;
    border: 1px solid var(--border-light);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: default;
    position: relative;
    overflow: hidden;
}

/* 卡片顶部渐变条 */
.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature:hover {
    border-color: var(--border-medium);
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.feature:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
    display: block;
    filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.2));
}

.feature h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.4px;
    line-height: 1.3;
}

.feature p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    letter-spacing: -0.1px;
}

/* CTA Buttons - 紧凑的按钮 */
.actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-top: 0;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
    flex-shrink: 0;
}

.btn {
    padding: 14px 36px;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    letter-spacing: -0.2px;
    position: relative;
    overflow: hidden;
}

/* 按钮光泽效果 */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35), 0 0 0 1px rgba(99, 102, 241, 0.1);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.45), 0 0 0 1px rgba(99, 102, 241, 0.15);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1.5px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--border-medium);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Footer - 紧凑的页脚 */
.footer {
    margin-top: auto;
    padding: 24px 0;
    border-top: 1px solid var(--border-light);
    text-align: center;
    font-size: 13px;
    color: var(--text-tertiary);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.45s both;
    letter-spacing: -0.1px;
    width: 100%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer a {
    color: var(--primary-start);
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
}

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

/* 响应式设计 - 一屏布局优化 */
@media (max-width: 1024px) {
    .features {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    
    .feature {
        padding: 28px 20px;
    }
    
    h1 {
        font-size: 42px;
    }
    
    .container {
        padding: 0 36px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
        height: auto;
        min-height: 100vh;
    }
    
    .hero {
        margin-bottom: 40px;
    }
    
    .logo {
        font-size: 56px;
    }
    
    h1 {
        font-size: 36px;
        letter-spacing: -1px;
    }
    
    .subtitle {
        font-size: 17px;
        line-height: 1.6;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 16px;
        margin: 0 0 40px 0;
        max-width: 500px;
    }
    
    .feature {
        padding: 28px 24px;
    }
    
    .actions {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
        gap: 12px;
    }
    
    .btn {
        width: 100%;
        padding: 14px 32px;
    }
    
    .footer {
        margin-top: 40px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 30px;
    }
    
    .subtitle {
        font-size: 15px;
    }
    
    .feature h3 {
        font-size: 17px;
    }
    
    .logo {
        font-size: 48px;
    }
}