* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
}

body {
    display: flex;
    flex-direction: column;
}

.header {
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.hamburger {
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
}

.hamburger span {
    width: 100%;
    height: 3px;
    background: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.menu {
    position: fixed;
    left: -280px;
    top: 0;
    width: 280px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    transition: left 0.3s ease;
    z-index: 99;
    overflow-y: auto;
    padding-top: 80px;
}

.menu.active {
    left: 0;
}

.menu ul {
    list-style: none;
}

.menu li {
    border-bottom: 1px solid #f0f0f0;
}

.menu a {
    display: block;
    padding: 15px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.2s ease;
}

.menu a:hover {
    background: #f5f5f5;
    color: #667eea;
    padding-left: 30px;
}

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

.section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.section-title {
    font-size: 22px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 15px;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.time-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.time-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.time-card .time {
    font-size: 32px;
    font-weight: bold;
    font-family: 'Courier New', monospace;
    margin-bottom: 10px;
}

.time-card .date {
    font-size: 14px;
    opacity: 0.9;
}

.notice-item {
    padding: 15px;
    border-left: 4px solid #667eea;
    background: #f9f9f9;
    margin-bottom: 10px;
    border-radius: 4px;
}

.notice-item.collapsed {
    max-height: 100px;
    overflow: hidden;
}

.notice-title {
    font-weight: bold;
    color: #667eea;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notice-content {
    margin-top: 10px;
    line-height: 1.6;
    color: #555;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 14px;
}

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

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.3);
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: bold;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

thead {
    background: #f5f5f5;
}

th {
    padding: 12px;
    text-align: left;
    font-weight: bold;
    border-bottom: 2px solid #ddd;
    color: #667eea;
}

td {
    padding: 12px;
    border-bottom: 1px solid #eee;
}

tbody tr:hover {
    background: #f9f9f9;
}

.upload-area {
    border: 2px dashed #667eea;
    border-radius: 5px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: #f9f9f9;
}

.upload-area:hover {
    background: #f0f0f0;
    border-color: #764ba2;
}

.upload-area.dragover {
    background: #e3e5eb;
    border-color: #667eea;
}

.file-list {
    margin-top: 15px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 5px;
    margin-bottom: 5px;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 10px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #667eea;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    background: none;
    border: none;
    color: #999;
}

.footer {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    text-align: center;
    color: #666;
    border-top: 1px solid #eee;
    margin-top: 20px;
}

.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 15px;
}

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

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

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

@media (max-width: 768px) {
    .main {
        padding: 15px;
    }

    .section {
        padding: 15px;
    }

    .section-title {
        font-size: 18px;
    }

    .time-display {
        grid-template-columns: 1fr;
    }

    table {
        font-size: 14px;
    }

    th, td {
        padding: 8px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 10px 15px;
    }

    .logo {
        font-size: 18px;
    }

    .hamburger {
        width: 30px;
        height: 30px;
    }

    .main {
        padding: 10px;
    }

    .section {
        padding: 12px;
    }

    .section-title {
        font-size: 16px;
    }

    table {
        font-size: 12px;
    }

    th, td {
        padding: 6px;
    }

    .btn {
        padding: 10px 15px;
        font-size: 14px;
    }
}