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<body>
    <!-- ส่วนของ loading screen -->
    <div id="loadingScreen">
        <div class="spinner"></div>
        <div id="loadingMessage">กำลังตรวจสอบการเข้าสู่ระบบ...</div>
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    <div id="mainContent" style="display: none;">
        <div class="container">
            <div class="header">
                <img src="https://www.cyfence.com/wp-content/uploads/2021/09/%E0%B8%A5%E0%B8%87%E0%B9%80%E0%B8%A7%E0%B9%87%E0%B8%9A%E0%B9%83%E0%B8%AB%E0%B8%A1%E0%B9%88.jpg" alt="Cyfence Logo" class="logo">
                <h1>Shift schedule</h1>
                <div id="userInfo" style="color: #666; margin-left: 20px;"></div>
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            <div class="logout-container">
                <button onclick="logout()" class="logout-btn">ออกจากระบบ</button>
            </div>
            <div class="team-info">
                <div class="team-card red" onclick="toggleTeamMembers('red')">
                    <h3>Shift A (Red Team)</h3>
                    <div class="team-leader">
                        <p>Leader: อธิราช</p>
                    </div>
                    <div class="team-members" id="red-members">
                        <p>2. กฤตเมธ</p>
                        <p>3. ศรัณยู</p>
                        <p>4. ขจรพล</p>
                        <p>5. ชานุพัทร</p>
                        <p>6. ศรัณย์</p>
                        <p>7. - </p>
                        <p>8. - </p>
                    </div>
                    <div class="expand-icon">▼</div>
                </div>
                <div class="team-card green" onclick="toggleTeamMembers('green')">
                    <h3>Shift B (Green Team)</h3>
                    <div class="team-leader">
                        <p>Leader: ปพน</p>
                    </div>
                    <div class="team-members" id="green-members">
                        <p>2. ณัฏฐดนัย</p>
                        <p>3. ธนพงศ์</p>
                        <p>4. ธนากร</p>
                        <p>5. D</p>
                        <p>6. E</p>
                        <p>7. F</p>
                        <p>8. G</p>
                    </div>
                    <div class="expand-icon">▼</div>
                </div>
                <div class="team-card blue" onclick="toggleTeamMembers('blue')">
                    <h3>Shift C (Blue Team)</h3>
                    <div class="team-leader">
                        <p>Leader: กฤษฏ์</p>
                    </div>
                    <div class="team-members" id="blue-members">
                        <p>2. วิศรุต</p>
                        <p>3. พรภวิษย์</p>
                        <p>4. มนต์เสกค์</p>
                        <p>5. D</p>
                        <p>6. E</p>
                        <p>7. F</p>
                        <p>8. G</p>
                    </div>
                    <div class="expand-icon">▼</div>
                </div>
                <div class="team-card yellow" onclick="toggleTeamMembers('yellow')">
                    <h3>Shift D (Yellow Team)</h3>
                    <div class="team-leader">
                        <p>Leader: พิสุทธิ์</p>
                    </div>
                    <div class="team-members" id="yellow-members">
                        <p>2. วิษาโรจน์</p>
                        <p>3. เจตนา</p>
                        <p>4. วุฒิชัย</p>
                        <p>5. D</p>
                        <p>6. E</p>
                        <p>7. F</p>
                        <p>8. G</p>
                    </div>
                    <div class="expand-icon">▼</div>
                </div>
            </div>
            <div class="controls">
                <button onclick="changeMonth(-1)" class="nav-btn">← Previous month</button>
                <div class="date-selectors">
                    <select id="monthSelect"></select>
                    <select id="yearSelect"></select>
                </div>
                <button onclick="changeMonth(1)" class="nav-btn">Next month →</button>
            </div>

            <div class="filters-container">
                <div class="shift-filters">
                    <label class="shift-filter">
                        <input type="checkbox" value="red" checked class="shift-checkbox" onchange="updateFilters()">
                        <span class="checkmark red">Shift A - อธิราช (Red Team)</span>
                    </label>
                    <label class="shift-filter">
                        <input type="checkbox" value="green" checked class="shift-checkbox" onchange="updateFilters()">
                        <span class="checkmark green">Shift B - ปพน (Green Team)</span>
                    </label>
                    <label class="shift-filter">
                        <input type="checkbox" value="blue" checked class="shift-checkbox" onchange="updateFilters()">
                        <span class="checkmark blue">Shift C - กฤษฏ์ (Blue Team)</span>
                    </label>
                    <label class="shift-filter">
                        <input type="checkbox" value="yellow" checked class="shift-checkbox" onchange="updateFilters()">
                        <span class="checkmark yellow">Shift D - พิสุทธิ์ (Yellow Team)</span>
                    </label>
                </div>
                <div class="filter-buttons">
                    <button onclick="selectAllShifts(true)" class="filter-btn">Select all</button>
                    <button onclick="selectAllShifts(false)" class="filter-btn">Cancel all</button>
                </div>
            </div>

            <div class="export-controls">
                <div class="date-range">
                    <div>
                        <label>Start date:</label>
                        <select id="startMonthSelect" class="month-select"></select>
                        <select id="startYearSelect" class="year-select"></select>
                    </div>
                    <div>
                        <label>End date:</label>
                        <select id="endMonthSelect" class="month-select"></select>
                        <select id="endYearSelect" class="year-select"></select>
                    </div>
                </div>
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