:root {
    --primary-color: #0ea5e9;
    --secondary-color: #06d6a0;
    --bg-gradient: linear-gradient(135deg, #f0f9ff 0%, #f0fdfa 100%);
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --card-bg: rgba(255, 255, 255, 0.9);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.07);
    --radius-lg: 20px;
    --border-color: rgba(14, 165, 233, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.9;
    color: var(--text-primary);
    background-color: #f8f9fa;
    background-image: var(--bg-gradient);
    margin: 0;
    padding: 2rem;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 3rem 4rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(255, 255, 255, 0.8);
    animation: fadeIn 0.8s ease-out forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 3rem;
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-shadow: 0 2px 8px rgba(14, 165, 233, 0.1);
    position: relative;
    padding-bottom: 1rem;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 2px;
}

h2 {
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
}

h3 {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

p, ul {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

ul {
    padding-left: 25px;
    list-style-type: '✓ ';
}

li {
    margin-bottom: 0.75rem;
    padding-left: 0.5rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border-bottom: 1px dashed transparent;
}

a:hover {
    color: #0284c7;
    border-bottom-color: #0284c7;
}

p a[href^="mailto:"] {
    font-weight: 600;
    background-color: rgba(14, 165, 233, 0.1);
    padding: 0.3rem 0.6rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

p a[href^="mailto:"]:hover {
    background-color: rgba(14, 165, 233, 0.2);
    border-color: rgba(14, 165, 233, 0.4);
    border-bottom: 1px solid var(--border-color);
}

blockquote {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-left: 5px solid var(--primary-color);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

blockquote p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.home-link-container {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px dashed #ddd;
}

.home-link {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 8px 25px rgba(6, 214, 160, 0.3);
    transition: all 0.3s ease;
    border-bottom: none;
}

.home-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(6, 214, 160, 0.4);
    text-decoration: none;
    border-bottom: none;
}

@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }
    .container {
        padding: 1.5rem;
        margin: 1rem auto;
    }
    h1 {
        font-size: 2.2rem;
    }
    h2 {
        font-size: 1.4rem;
    }
}