table {
            width: 100%;
            border-collapse: collapse;
            margin: 0px;
            font-size: 1em;
            font-family: Arial, sans-serif;
            max-width: 400px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        table th,
        table td {
            padding: 12px 5px;
            text-align: center;
        }

        table th {
            font-weight: bold;
            font-size: 1.1em;
            letter-spacing: 1px;
        }

        table thead tr {
            background-color: #009879;
            color: #ffffff;
        }

        table tbody tr {
            border-bottom: 1px solid #dddddd;
            line-height: 1.5;
        }

        table tbody tr:last-of-type {
            border-bottom: 2px solid #009879;
        }

        table tbody tr.active-row {
            font-weight: bold;
            color: #009879;
        }

        body {
            font-family: Arial, sans-serif;
            /* Thêm background image */
            /* background-image: url('https://upload.wikimedia.org/wikipedia/commons/2/22/Th%C6%B0_vi%E1%BB%87n_HUIT.jpg'); */
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            background-attachment: fixed;
            background-color: #f5f5f5; /* Fallback color */
            margin: 0;
            padding: 5px;
            min-height: 100vh;
            /* Thêm overlay để text dễ đọc hơn */
            position: relative;
        }

        /* Thêm overlay để text dễ đọc hơn trên background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(1px);
            z-index: -1;
            pointer-events: none;
        }

        #wrapper {
            max-width: 800px;
            margin: 0px auto;
            background-color: rgba(255, 255, 255, 0.95); /* Thêm độ trong suốt */
            border-radius: 10px;
            box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.2); /* Tăng shadow */
            overflow: hidden;
            backdrop-filter: blur(10px); /* Thêm hiệu ứng blur */
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        #header {
            background-color: rgba(0, 140, 255, 0.9); /* Thêm độ trong suốt */
            color: #ffffff;
            text-align: center;
            padding: 5px;
            backdrop-filter: blur(5px);
        }

        #header h1 {
            margin: 0;
            font-size: 1.8em;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3); /* Thêm text shadow */
        }

        #footer {
            background-color: rgba(0, 0, 0, 0.8); /* Thêm độ trong suốt */
            color: white;
            text-align: center;
            padding: 5px;
            font-size: 0.9em;
            backdrop-filter: blur(5px);
        }

        #truong_khoa {
            background-color: rgba(0, 51, 102, 0.9); /* Thêm độ trong suốt */
            display: flex;
            min-height: 100px;
            color: white;
            padding: 5px;
            backdrop-filter: blur(5px);
        }

        #truong_khoa h4 {
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5); /* Thêm text shadow */
        }

        #truong {
            flex-basis: 50%;
            text-align: left;
        }

        #khoa {
            flex-basis: 50%;
            text-align: right;
        }

        #main_content {
            display: flex;
            flex-wrap: wrap;
        }

        #detai {
            border-radius: 8px;
            margin: 10px;
        }

        #detai h2, #detai h3 {
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3); /* Thêm text shadow */
        }

        #thietbi,
        #giamsat {
            border-radius: 8px;
            padding: 10px;
            margin: 10px;
            box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.15); /* Tăng shadow */
            flex: 1 1 200px;
            line-height: 1;
            backdrop-filter: blur(5px); /* Thêm hiệu ứng blur */
        }

        #thietbi {
            font-weight: bolder;
            background-color: rgba(176, 234, 205, 0.9); /* Thêm độ trong suốt */
            text-align: center;
        }

        #thietbi th {
            font-size: 0.95em;
            font-weight: bold;
            letter-spacing: 1px;
        }

        #giamsat th {
            font-size: 0.95em;
            font-weight: bold;
            letter-spacing: 1px;
        }

        #giamsat {
            font-weight: bolder;
            background-color: rgba(64, 186, 205, 0.9); /* Thêm độ trong suốt */
            color: #ffffff;
            text-align: center;
        }

        #thongtin {
            text-align: left;
            margin: 20px;
        }

        #thongtin h4 {
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3); /* Thêm text shadow */
        }

        #temp {
            color: red;
            text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
        }

        #humi {
            color: blue;
            text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
        }

        button {
            background-color: #007bff;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease-in-out;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); /* Thêm shadow */
        }

        button:hover {
            background-color: #0056b3;
            transform: scale(1.05);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3); /* Tăng shadow khi hover */
        }

        button:active {
            background-color: #003d80;
            transform: scale(0.95);
        }

        #set {
            margin: 5px 10px;
            padding-top: 20px;
            padding-bottom: 20px;
            max-width: 1000px;
            background: rgba(66, 144, 135, 0.9); /* Thêm độ trong suốt */
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15); /* Tăng shadow */
            text-align: center;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            backdrop-filter: blur(5px); /* Thêm hiệu ứng blur */
        }

        #im_ex {
            margin: 0 auto;
            padding: 20px 0 0 0;
            background: rgba(227, 242, 253, 0.9); /* Thêm độ trong suốt */
            border-radius: 8px;
            box-shadow: 0 1px 8px rgba(25, 118, 210, 0.15); /* Tăng shadow */
            max-width: 500px;
            min-width: 200px;
            backdrop-filter: blur(3px);
        }

        #im_ex p {
            font-weight: bold;
            font-size: 1.1em;
            letter-spacing: 1px;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }

        #save_down {
            flex-direction: column;
            gap: 10px;
            align-items: center;
            justify-content: center;
            width: 100%;
            padding: 16px;
            box-sizing: border-box;
        }

        #save_down button {
            margin: 0 12px;
            padding: 12px 18px;
            border-radius: 5px;
            background: #1976d2;
            color: #fff;
            font-weight: normal;
            text-transform: none;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s;
            font-size: 1em;
            min-width: 80px;
            box-shadow: 0 2px 10px rgba(25, 118, 210, 0.20); /* Tăng shadow */
        }

        #save_down button:hover {
            background: #1565c0;
            transform: scale(1.05);
            box-shadow: 0 4px 15px rgba(25, 118, 210, 0.30); /* Tăng shadow khi hover */
        }

        #T1,
        #T2 {
            font-weight: bold;
            color: #1976d2;
            text-align: center;
            padding: 6px 0;
            font-size: 0.95em;
            letter-spacing: 1px;
            border-radius: 6px;
            background: rgba(227, 242, 253, 0.9); /* Thêm độ trong suốt */
            margin: 4px 0;
            box-shadow: 0 1px 6px rgba(25, 118, 210, 0.15); /* Tăng shadow */
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }

        #sheet-status {
            display: none;
            background-color: rgba(76, 175, 80, 0.9); /* Thêm độ trong suốt */
            color: white;
            padding: 10px;
            border-radius: 5px;
            margin: 10px auto 0 auto;
            text-align: center;
            font-weight: bold;
            width: 90%;
            max-width: 320px;
            backdrop-filter: blur(3px);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }

        #sheet-status.error {
            background-color: rgba(244, 67, 54, 0.9); /* Thêm độ trong suốt */
        }

        /* Helper class for text alignment */
        .text-center {
            text-align: center;
        }

        @media (max-width: 768px) {
            body {
                font-size: 14px;
                background-attachment: scroll; /* Thay đổi cho mobile */
            }

            .container {
                width: 95%;
                padding: 10px;
            }

            #main_content {
                flex-direction: column;
            }

            #thietbi,
            #giamsat {
                flex: 1 1 100%;
            }

            #save_down {
                flex-direction: column;
                gap: 10px;
                align-items: center;
                justify-content: center;
                width: 100%;
            }

            #save_down button {
                width: 90%;
                min-width: 120px;
                padding: 12px 0;
                font-size: 16px;
                margin: 5px 0;
                box-sizing: border-box;
            }

            button {
                padding: 12px;
            }
        }

        #login-page {
            position: fixed;
            z-index: 99999;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            width: 100vw;
            height: 100vh;
            /* Thêm background cho login page */
            background: linear-gradient(135deg, rgba(25, 118, 210, 0.9) 0%, rgba(103, 198, 255, 0.9) 100%);
            backdrop-filter: blur(10px);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: opacity 0.4s;
        }

        .login-container {
            background: rgba(255, 255, 255, 0.95); /* Thêm độ trong suốt */
            border-radius: 18px;
            box-shadow: 0 8px 40px rgba(25, 118, 210, 0.25); /* Tăng shadow */
            padding: 36px 32px 28px 32px;
            min-width: 320px;
            max-width: 95vw;
            text-align: center;
            animation: fadeInLogin 0.7s cubic-bezier(.4, 2, .6, 1) 1;
            backdrop-filter: blur(15px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        @keyframes fadeInLogin {
            from {
                transform: translateY(40px) scale(0.95);
                opacity: 0;
            }

            to {
                transform: none;
                opacity: 1;
            }
        }

        .login-logo {
            margin-bottom: 12px;
        }

        .login-desc {
            color: #1976d2;
            margin-bottom: 18px;
            font-size: 1.08em;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }

        .login-inputs {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin-bottom: 18px;
        }

        .login-digit {
            width: 38px;
            height: 48px;
            font-size: 2em;
            text-align: center;
            border: 2px solid #b3d1f7;
            border-radius: 8px;
            outline: none;
            transition: border 0.2s, box-shadow 0.2s;
            background: rgba(247, 251, 255, 0.9); /* Thêm độ trong suốt */
            box-shadow: 0 1px 6px rgba(25, 118, 210, 0.12); /* Tăng shadow */
            backdrop-filter: blur(3px);
        }

        .login-digit:focus {
            border: 2px solid #1976d2;
            background: rgba(227, 242, 253, 0.9); /* Thêm độ trong suốt */
            box-shadow: 0 2px 10px rgba(25, 118, 210, 0.2);
        }

        .login-btn {
            width: 100%;
            padding: 12px 0;
            background: linear-gradient(90deg, #1976d2 60%, #67c6ff 100%);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 1.1em;
            font-weight: bold;
            cursor: pointer;
            margin-bottom: 10px;
            box-shadow: 0 2px 12px rgba(25, 118, 210, 0.20); /* Tăng shadow */
            transition: background 0.2s, transform 0.2s;
        }

        .login-btn:hover {
            background: linear-gradient(90deg, #1565c0 60%, #67c6ff 100%);
            transform: scale(1.03);
            box-shadow: 0 4px 18px rgba(25, 118, 210, 0.30);
        }

        .login-error {
            color: #e53935;
            min-height: 24px;
            font-size: 1em;
            margin-top: 2px;
            font-weight: 500;
            transition: opacity 0.5s ease;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }

        @media (max-width: 480px) {
            .login-container {
                min-width: 90vw;
                padding: 18px 4vw;
            }

            .login-inputs {
                gap: 6px;
            }

            .login-digit {
                width: 30px;
                height: 38px;
                font-size: 1.3em;
            }
        }