/* 全局样式 */
* {
    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;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: #2c3e50;
    color: white;
    padding: 1rem;
    text-align: center;
    border-radius: 5px;
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
}

main {
    background: white;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    margin-top: 20px;
    padding: 1rem;
    color: #777;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group button {
    background: #3498db;
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    width: 100%;
}

.form-group button:hover {
    background: #2980b9;
}

.btn {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    margin-right: 10px;
}

.btn:hover {
    background: #2980b9;
}

.btn-outline {
    background: transparent;
    border: 1px solid #3498db;
    color: #3498db;
}

.btn-outline:hover {
    background: #3498db;
    color: white;
}

.welcome {
    text-align: center;
}

.welcome p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

/* 消息提示 */
#message {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
    text-align: center;
}

.message-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 5px;
    text-align: center;
}

.modal-buttons {
    margin-top: 20px;
}

.modal-button {
    padding: 10px 20px;
    margin: 0 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.modal-button-primary {
    background-color: #3498db;
    color: white;
}

.modal-button-secondary {
    background-color: #95a5a6;
    color: white;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: black;
}

.human-verification {
    display: flex;
    align-items: center;
    gap: 10px;
}

.human-verification input[type="checkbox"] {
    width: auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 10px;
    }
    
    main {
        padding: 1rem;
    }
    
    .btn {
        display: block;
        margin: 10px 0;
        text-align: center;
    }
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h3 {
    color: #2c3e50;
    font-size: 1.4rem;
    margin-bottom: 15px;
    text-align: center;
}

.modal-content p {
    text-align: center;
    font-size: 1rem;
}

.close {
    color: #aaa;
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover,
.close:focus {
    color: #e74c3c;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    justify-content: center;
}

.modal-button {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.modal-button-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.modal-button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.modal-button-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.modal-button-secondary:hover {
    background: #f8f9fa;
    transform: translateY(-2px);
}

@media (max-width: 480px) {
    .modal-content {
        margin: 20% auto;
        padding: 20px;
    }
    
    .modal-buttons {
        flex-direction: column;
    }
    
    .modal-button {
        width: 100%;
    }
}