/* 定义颜色变量 - 保持浅色主题 */
:root {
    --color-primary: #00bcd4;
    --color-secondary: #0097a7;
    --color-light-bg: #f7fafd;
    --color-dark-text: #222831;
    --color-text-sub: #6c757d;
    --color-card-bg: #ffffffcc;
    --color-border: #e3e8ee;
    --color-blur-bg: rgba(255, 255, 255, 0.7);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 16px 32px rgba(0, 188, 212, 0.10);
    --font-main: 'Inter', 'Arial', sans-serif;
    --radius-lg: 16px;
    --radius-md: 8px;
    --transition: all 0.3s cubic-bezier(.4, 2, .3, 1);
}

body {
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    background: linear-gradient(120deg, #e0f7fa 0%, #f7fafd 100%);
    color: var(--color-dark-text);
    overflow-x: hidden;
    letter-spacing: 0.01em;
    font-size: 18px;
}

/* --- Hero Section 样式：实现高级透明背景的关键 --- */
.hero {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse 80% 60% at 50% 30%, rgba(0, 188, 212, 0.10) 0%, rgba(255, 255, 255, 0.85) 80%, var(--color-light-bg) 100%);
    backdrop-filter: blur(2px);
    box-shadow: 0 4px 32px rgba(0, 188, 212, 0.04);
    border-radius: var(--radius-lg);
    margin: 32px 0 0 0;
}

/* ... 其他样式保持不变 ... */

/* 移除霓虹发光效果 */
.hero h1 {
    font-size: 3.5em;
    margin-bottom: 0.3em;
    /* 使用深色文字 */
    color: var(--color-dark-text);
    /* 移除霓虹发光 */
    text-shadow: none;
}

.hero p {
    font-size: 1.2em;
    margin-bottom: 1.5em;
    /* 更改为次要文字颜色 */
    color: var(--color-text-sub);
}

/* 导航栏：透明背景，浅色边框 */
.navbar {
    position: absolute;
    top: 0;
    width: 100%;
    padding: 20px 50px;
    background: var(--color-blur-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 12px rgba(0, 188, 212, 0.04);
    z-index: 20;
    backdrop-filter: blur(8px);
}

.logo {
    font-size: 2em;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 2.5px;
    text-shadow: 0 2px 8px rgba(0, 188, 212, 0.08);
}

/* 🌟 CTA 按钮：简洁、高对比度 🌟 */
.cta-button {
    display: inline-block;
    padding: 16px 48px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: #fff;
    text-decoration: none;
    font-size: 1.15em;
    font-weight: 700;
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: 0 4px 24px rgba(0, 188, 212, 0.10);
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
    letter-spacing: 0.05em;
}

.cta-button:hover {
    background: linear-gradient(90deg, #0097a7 0%, #00bcd4 100%);
    box-shadow: 0 8px 32px rgba(0, 188, 212, 0.18);
    transform: scale(1.04) translateY(-2px);
}

/* 装饰性元素全部移除 */
.pulse-effect,
.hero::before {
    display: none;
}

/* --- Features Section (优势网格) --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    padding: 96px 5vw;
    text-align: center;
    background: var(--color-light-bg);
    border-radius: var(--radius-lg);
}

.feature-card {
    background: var(--color-card-bg);
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    backdrop-filter: blur(6px);
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: scale(1.03) translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary);
    background: linear-gradient(120deg, #e0f7fa 0%, #fff 100%);
}

.feature-card i {
    font-size: 3em;
    color: var(--color-primary);
    margin-bottom: 18px;
    text-shadow: 0 2px 8px rgba(0, 188, 212, 0.08);
}

.feature-card h3 {
    color: var(--color-dark-text);
    margin-top: 0;
    font-size: 1.35em;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* 强调“穿透封锁”的卡片样式 (简化) */
.features-grid .feature-card:first-child h3 {
    color: var(--color-dark-text);
    /* 标题使用深色 */
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 32px 0 16px 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-sub);
    font-size: 0.95em;
    background: var(--color-blur-bg);
    backdrop-filter: blur(4px);
    box-shadow: 0 -2px 12px rgba(0, 188, 212, 0.04);
}

/* 页脚链接样式 */
footer a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s cubic-bezier(.4, 2, .3, 1);
    font-weight: 500;
}

footer a:hover {
    color: #0097a7;
}

/* 响应式优化 */
@media (max-width: 900px) {
    .features-grid {
        padding: 48px 2vw;
        gap: 24px;
    }

    .feature-card {
        padding: 24px 10px;
    }

    .navbar {
        padding: 12px 16px;
    }

    .hero {
        margin-top: 0;
        min-height: 40vh;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 16px;
    }

    .hero h1 {
        font-size: 2em;
    }

    .features-grid {
        grid-template-columns: 1fr;
        padding: 24px 2vw;
    }

    .navbar {
        padding: 8px 8px;
    }
}