/* 重置与基础 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: #333;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

/* 顶部横幅 */
.update-banner {
    background: linear-gradient(90deg, #4CAF50, #2E7D32);
    color: white;
    padding: 12px 20px;
    text-align: center;
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
    animation: fadeInDown 0.5s;
}

/* 头部 */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.8rem;
    color: #1a237e;
    margin-bottom: 10px;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
}

nav {
    background: white;
    padding: 15px;
    border-radius: 12px;
    display: inline-block;
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}

nav a {
    text-decoration: none;
    color: #555;
    font-weight: 600;
    padding: 10px 20px;
    margin: 0 5px;
    border-radius: 8px;
    transition: all 0.3s;
    border: 2px solid transparent;
}

nav a:hover {
    background: #1a237e;
    color: white;
    border-color: #1a237e;
}

/* 主内容区 */
main {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 18px;
    padding: 30px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    animation: fadeInUp 0.6s;
}

section {
    display: none;
    padding: 20px;
}

section h2 {
    color: #1a237e;
    border-left: 6px solid #4CAF50;
    padding-left: 15px;
    margin-bottom: 25px;
    font-size: 1.8rem;
}

/* 卡片 */
.survey-card {
    background: #f8f9fa;
    border-left: 5px solid #2196F3;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 10px;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.survey-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(33, 150, 243, 0.2);
}

.survey-card h3 {
    color: #1a237e;
    margin-bottom: 10px;
}

.survey-card button {
    background: #2196F3;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 10px;
    transition: background 0.3s;
}

.survey-card button:hover {
    background: #0b7dda;
}

/* 表单 */
label {
    display: block;
    margin-bottom: 15px;
    font-weight: 600;
    color: #444;
}

input[type="text"], textarea, select {
    width: 100%;
    padding: 14px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    margin-top: 6px;
    transition: border 0.3s;
}

input[type="text"]:focus, textarea:focus {
    border-color: #4CAF50;
    outline: none;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

/* 按钮 */
button {
    background: linear-gradient(90deg, #4CAF50, #2E7D32);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin: 10px 5px;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(76, 175, 80, 0.4);
}

button.secondary {
    background: linear-gradient(90deg, #2196F3, #0b7dda);
}

button.danger {
    background: linear-gradient(90deg, #f44336, #d32f2f);
}

/* 语音按钮 */
.voice-btn {
    background: linear-gradient(90deg, #FF9800, #F57C00);
    padding: 10px 20px;
    font-size: 14px;
    margin-left: 10px;
}

.voice-btn:hover {
    background: linear-gradient(90deg, #F57C00, #E65100);
}

.recording {
    animation: pulse 1.5s infinite;
}

/* 文件上传区 */
#upload {
    text-align: center;
    padding: 40px;
}

.file-zone {
    border: 3px dashed #4CAF50;
    border-radius: 15px;
    padding: 40px;
    background: #f9fff9;
    margin-bottom: 30px;
}

.file-zone input[type="file"] {
    padding: 20px;
    background: white;
    border-radius: 10px;
    width: 80%;
    margin: 0 auto;
    display: block;
}

/* 问题项 */
.question-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 5px solid #9C27B0;
}

/* 页脚 */
footer {
    text-align: center;
    margin-top: 40px;
    color: #666;
    font-size: 14px;
}

footer a {
    color: #1a237e;
    text-decoration: none;
}

/* 动画 */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* 响应式 */
@media (max-width: 768px) {
    body { padding: 10px; }
    main { padding: 20px; }
    nav a { display: block; margin: 10px 0; }
    header h1 { font-size: 2rem; }
}