/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* 登录页面样式 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header h1 {
    color: #1a73e8;
    margin-bottom: 10px;
    text-align: center;
    font-size: 24px;
}

.login-header p {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
}

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

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

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group select:focus {
    outline: none;
    border-color: #1a73e8;
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

/* 单选按钮样式 */
.form-group input[type="radio"] {
    width: auto;
    margin-right: 5px;
    cursor: pointer;
}

.form-group input[type="radio"]:focus {
    box-shadow: none;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    text-align: center;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
}

.login-btn:hover {
    background-color: #1557b0;
}

.login-btn:active {
    transform: scale(0.98);
}

/* 仪表板样式 */
.dashboard-container {
    min-height: 100vh;
    display: flex;
}

/* 侧边栏导航 */
.dashboard-sidebar {
    width: 250px;
    background: #1a73e8;
    color: white;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h1 {
    font-size: 18px;
    margin: 0;
}

.dashboard-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dashboard-nav li {
    position: relative;
}

.dashboard-nav a {
    display: block;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.dashboard-nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.dashboard-nav a.active {
    background-color: rgba(255, 255, 255, 0.2);
    font-weight: 500;
    border-left-color: white;
}

/* 主内容区 */
.dashboard-content {
    flex: 1;
    margin-left: 250px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.dashboard-header {
    background: white;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.user-info {
    margin-right: 20px;
    color: #555;
}

.logout-btn {
    padding: 8px 16px;
    background-color: #f5f7fa;
    color: #333;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background-color: #e0e0e0;
}

.dashboard-main {
    flex: 1;
    padding: 30px;
    background-color: #f5f7fa;
}

.welcome-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    animation: fadeIn 0.5s ease-out;
}

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

.welcome-section h2 {
    color: #1a73e8;
    margin-bottom: 10px;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
    animation: cardSlideIn 0.6s ease-out;
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.card h3 {
    color: #333;
    margin-bottom: 10px;
}

.card p {
    color: #666;
    margin-bottom: 20px;
}

.card-btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1a73e8;
    color: white;
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.card-btn:hover {
    background-color: #1557b0;
    transform: translateY(-2px);
}

/* 公告样式 */
.announcement-banner {
    background: #ff4757;
    color: white;
    padding: 10px;
    overflow: hidden;
    position: relative;
}

.banner-content {
    white-space: nowrap;
    animation: scrollBanner 20s linear infinite;
}

@keyframes scrollBanner {
    0% {
        transform: translateX(100%);
    }
    100% {
        transform: translateX(-100%);
    }
}

.announcement-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.popup-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: slideIn 0.3s ease;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #666;
}

/* 维护页面样式 */
.maintenance-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.maintenance-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
    animation: slideIn 0.5s ease-out;
}

.maintenance-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.maintenance-box h1 {
    color: #333;
    margin-bottom: 15px;
}

.maintenance-box p {
    color: #666;
    margin-bottom: 20px;
}

.back-btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1a73e8;
    color: white;
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background-color: #1557b0;
}

/* 奖学金评选页面样式 */
.selection-container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.selection-container h2 {
    color: #1a73e8;
    margin-bottom: 20px;
}

.upload-form {
    margin-bottom: 30px;
}

.form-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.form-col {
    flex: 1;
}

.file-upload {
    border: 2px dashed #ddd;
    border-radius: 5px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.file-upload:hover {
    border-color: #1a73e8;
    background-color: #f8f9ff;
}

.file-upload input[type="file"] {
    display: none;
}

.file-label {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1a73e8;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-label:hover {
    background-color: #1557b0;
}

.submit-btn {
    padding: 12px 24px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background-color: #1557b0;
    transform: translateY(-2px);
}

/* 表格样式 */
.students-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.students-table th,
.students-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.students-table th {
    background-color: #f5f7fa;
    font-weight: 500;
    color: #333;
}

.students-table tr:hover {
    background-color: #f8f9ff;
}

/* 结果导出按钮 */
.export-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.export-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }
    
    .dashboard-nav ul {
        flex-direction: column;
    }
    
    .feature-cards {
        grid-template-columns: 1fr;
    }
    
    .dashboard-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .header-right {
        display: flex;
        flex-direction: column;
        gap: 10px;
        align-items: center;
    }
}