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

:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --accent-color: #1abc9c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-color: #f8f9fa;
    --dark-color: #2c3e50;
    --gray-color: #7f8c8d;
    --border-radius: 8px;
    --box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ecf0f1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

/* 导航样式 */
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 3px 15px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-brand a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    letter-spacing: 0.5px;
}

.nav-brand a:hover {
    text-shadow: 0 0 10px rgba(255,255,255,0.5);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.3) transparent;
    padding-bottom: 5px;
}

.nav-links::-webkit-scrollbar {
    height: 4px;
}

.nav-links::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
}

.nav-links::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.3);
    border-radius: 2px;
}

.nav-links::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.5);
}

.nav-links li {
    flex-shrink: 0;
}

.nav-links li a {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    display: block;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

.nav-links li a:hover,
.nav-links li a.active {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.nav-links li a.active:after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background-color: white;
    border-radius: 2px;
}

/* 移动端导航按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: white;
    border-radius: 3px;
    transition: var(--transition);
}

/* 首页项目网格 */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.project-card {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border-top: 4px solid var(--primary-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.project-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(26, 188, 156, 0.05));
    z-index: 0;
}

.project-icon {
    font-size: 3.8rem;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.project-card h2 {
    color: var(--dark-color);
    margin-bottom: 15px;
    font-weight: 600;
    position: relative;
    z-index: 1;
    font-size: 1.5rem;
}

.project-card p {
    color: var(--gray-color);
    margin-bottom: 25px;
    position: relative;
    z-index: 1;
    line-height: 1.7;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    z-index: 1;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
    letter-spacing: 0.5px;
}

.btn:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(52, 152, 219, 0.4);
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 35px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    margin-top: auto;
    box-shadow: 0 -3px 15px rgba(0,0,0,0.1);
}

footer p {
    margin: 6px 0;
    font-size: 0.95rem;
    opacity: 0.9;
}

/* 标题样式 */
h1 {
    color: var(--dark-color);
    margin-bottom: 18px;
    font-weight: 700;
    position: relative;
    display: inline-block;
    font-size: 2.2rem;
}

h1:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 70px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.subtitle {
    color: var(--gray-color);
    font-size: 1.15rem;
    margin-bottom: 35px;
    line-height: 1.5;
}

/* 表单样式 */
.form-section {
    background-color: #fff;
    padding: 25px;
    margin-bottom: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark-color);
}

input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
    background-color: #f9f9f9;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
    background-color: #fff;
}

button, 
.button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
    display: inline-block;
    text-decoration: none;
    text-align: center;
}

button:hover,
.button:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(52, 152, 219, 0.4);
}

/* 卡片样式 */
.card {
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 25px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

/* 结果显示样式 */
.result-card {
    background-color: #fff;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px rgba(0,0,0,0.12);
    margin-top: 35px;
    border-left: 5px solid var(--primary-color);
}

.success {
    color: var(--success-color);
    font-weight: 600;
    padding: 12px;
    background-color: rgba(46, 204, 113, 0.1);
    border-radius: var(--border-radius);
    margin: 15px 0;
}

.failed {
    color: var(--danger-color);
    font-weight: 600;
    padding: 12px;
    background-color: rgba(231, 76, 60, 0.1);
    border-radius: var(--border-radius);
    margin: 15px 0;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #ecf0f1;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--dark-color);
}

tr:hover {
    background-color: #f8f9fa;
}

/* 提示信息样式 */
.info {
    background-color: #f8f9fa;
    padding: 20px;
    border-left: 4px solid var(--primary-color);
    margin: 20px 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.warning {
    background-color: rgba(243, 156, 18, 0.1);
    padding: 20px;
    border-left: 4px solid var(--warning-color);
    margin: 20px 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        max-width: 95%;
    }
}

@media (max-width: 992px) {
    .project-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 25px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .form-section {
        padding: 20px;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        flex-direction: column;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-links.active {
        max-height: 350px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links li a {
        padding: 15px 20px;
        border-radius: 0;
    }
    
    .nav-links li a.active:after {
        bottom: 8px;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .result-card {
        padding: 20px;
    }
    
    table {
        display: block;
        overflow-x: auto;
    }
    
    .input-row {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .input-row label {
        margin-bottom: 8px;
    }
    
    .input-row input {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h1:after {
        width: 50px;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .project-card {
        padding: 20px;
    }
    
    .form-section {
        padding: 15px;
    }
    
    button, .button, .btn {
        width: 100%;
        padding: 12px 15px;
    }
    
    .score-details {
        font-size: 0.95rem;
    }
}

/* 打印样式 */
@media print {
    .main-nav, 
    footer, 
    .btn, 
    button, 
    .no-print {
        display: none !important;
    }
    
    body {
        background-color: white;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    .card, 
    .form-section, 
    .result-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    h1, h2, h3 {
        color: black;
    }
    
    h1:after {
        display: none;
    }
}