/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    max-width: 650px;
    width: 100%;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

header {
    background: #2c3e50;
    color: white;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    padding: 2.5rem;
}

.intro {
    text-align: center;
    margin-bottom: 2.5rem;
}

.intro h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.intro p {
    margin-bottom: 1rem;
    color: #555;
    font-size: 1.05rem;
}

.cta {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid #667eea;
}

.cta h3 {
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.cta p {
    margin-bottom: 1.5rem;
    color: #666;
}

form {
    display: flex;
    gap: 10px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

input[type="email"] {
    flex-grow: 1;
    min-width: 250px;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    padding: 12px 25px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background 0.3s ease;
}

button:hover {
    background: #5a6fd8;
}

.form-note {
    font-size: 0.85rem;
    color: #888;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background: #ecf0f1;
    color: #7f8c8d;
    font-size: 0.9rem;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 600px) {
    form {
        flex-direction: column;
    }
    input[type="email"] {
        min-width: auto;
    }
    main {
        padding: 1.5rem;
    }
}