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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.form-wrapper {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 30px 25px;
}

h1 {
    text-align: center;
    color: #1e3c72;
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.form-wrapper > p {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.required {
    color: #e74c3c;
}

input, textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: #1e3c72;
    box-shadow: 0 0 0 2px rgba(30,60,114,0.2);
}

textarea {
    resize: vertical;
    font-family: inherit;
}

small {
    display: block;
    font-size: 0.75rem;
    color: #888;
    margin-top: 5px;
}

.captcha-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.captcha-row input {
    flex: 1;
}

.captcha-row img {
    height: 42px;
    border-radius: 6px;
    border: 1px solid #ddd;
}

button {
    width: 100%;
    padding: 14px;
    background-color: #1e3c72;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0f2b4f;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.message {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    padding: 10px;
    border-radius: 6px;
    display: none;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    display: block;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    display: block;
}

/* 移动端优化 */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    .form-wrapper {
        padding: 20px 15px;
    }
    h1 {
        font-size: 1.5rem;
    }
    .captcha-row {
        flex-wrap: wrap;
    }
    .captcha-row img {
        width: auto;
        height: 40px;
    }
}