body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    /* background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 50%, #f5f7fa 100%); */
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    color: #333;
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.glassmorphism {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.18);
    transition: all 0.3s ease;
}

.glassmorphism:hover {
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.3);
    transform: translateY(-2px);
}

.course-card {
    border-radius: 8px;
    padding: 8px 6px;
    margin: 3px 0;
    color: #333;
    font-size: 13px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
}

.course-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}

.course-card .delete-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    display: none;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 10px;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.course-card:hover .delete-btn {
    display: block;
}

.course-card .delete-btn:hover {
    background-color: #ff4757;
    color: white;
    transform: scale(1.1);
}

.file-upload {
    border: 2px dashed #cbd5e1;
    transition: all 0.3s ease;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.file-upload:hover {
    border-color: #6366f1;
    background-color: #f0f4ff;
    transform: translateY(-2px);
}

.file-upload.active {
    border-color: #6366f1;
    background-color: #e0e7ff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.color-picker {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.color-picker:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.color-picker.selected-color {
    border-color: #1a202c;
    transform: scale(1.15);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.selected-colors-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
}

.selected-color-item {
    display: flex;
    align-items: center;
    background-color: #f8fafc;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.2s ease;
}

.selected-color-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.remove-color {
    margin-left: 8px;
    cursor: pointer;
    color: #ff4757;
    font-weight: bold;
    transition: all 0.2s ease;
}

.remove-color:hover {
    transform: scale(1.2);
}

/* 修改模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: hidden;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    padding: 0;
    border: none;
    border-radius: 16px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    width: 90%;
    max-width: 750px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalOpen 0.3s ease-out;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
}

@keyframes modalOpen {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.modal-header {
    padding: 14px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(120deg, #f8f9fa, #e9ecef);
}

.modal-body {
    padding:5px 24px;
    overflow-y: auto;
    max-height: calc(90vh - 160px);
}

.modal-footer {
    padding: 14px;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: flex-end;
    background: linear-gradient(120deg, #f8f9fa, #e9ecef);
}

.close-modal {
    font-size: 32px;
    font-weight: lighter;
    cursor: pointer;
    color: #a0aec0;
    transition: all 0.2s ease;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.close-modal:hover {
    color: #718096;
    background-color: #edf2f7;
    transform: rotate(90deg);
}

.btn {
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    margin-left: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    color: white;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}

.table-cell {
    min-height: 65px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.table-cell:hover {
    background-color: #f0f9ff;
    transform: scale(1.01);
    box-shadow: inset 0 0 0 1px #3182ce;
}

.time-period {
    background: linear-gradient(135deg, #e2e8f0, #cbd5e0);
    font-weight: bold;
    text-align: center;
    font-size: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #2d3748;
}

/* 课表标题样式 */
.timetable-title {
    background: transparent;
    color: white;
    border: none;
    outline: none;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    width: 100%;
    padding: 8px 16px;
    border-radius: 0;
    transition: all 0.3s ease;
}

.timetable-title::placeholder {
    color: #e0e7ff;
}

.timetable-title:hover,
.timetable-title:focus {
    background: rgba(255, 255, 255, 0.1);
}

/* 添加一些高级感的动画和过渡效果 */
.schedule-selection-item {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 优化统计面板 */
.stat-card {
    transition: all 0.3s ease;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* 优化表格样式 */
#course-table {
    border-spacing: 0;
    border-collapse: separate;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

#course-table th {
    font-weight: 600;
    color: #2d3748;
}

#course-table td {
    transition: all 0.2s ease;
}

/* 优化表头样式 */
#course-table thead tr:first-child th {
    background: linear-gradient(to right, #3b82f6, #4f46e5);
    color: white;
    font-weight: 700;
    letter-spacing: 1px;
}

#course-table thead tr:not(:first-child) th {
    background: linear-gradient(135deg, #edf2f7, #e2e8f0);
    font-weight: 600;
}

/* 添加优雅的滚动条 */
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.modal-body::-webkit-scrollbar-thumb {
    background: #c5c5c5;
    border-radius: 10px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}