:root {
            --primary-color: #006a4e;
            --primary-hover: #004d38;
            --border-color: #d1d5db;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Noto Sans Bengali', sans-serif !important; color: #333; background-color: #f8fafc; line-height: 1.6; }

        .gov-top-bar { background-color: #f1f5f9; font-size: 13px; padding: 6px 10%; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; }
        header { background: #ffffff; border-bottom: 3px solid var(--primary-color); padding: 15px 10%; display: flex; justify-content: space-between; align-items: center; }
        .logo-section { display: flex; align-items: center; gap: 15px; }
        .school-logo { width: 60px; height: 60px; border-radius: 50%; }

        nav { background-color: var(--primary-color); padding: 0 10%; }
        nav ul { list-style: none; display: flex; }
        nav ul li a { display: block; color: #ffffff; padding: 12px 16px; text-decoration: none; font-size: 15px; }
        nav ul li a:hover, nav ul li a.active { background-color: var(--primary-hover); }

        .container { max-width: 1200px; margin: 25px auto; padding: 0 15px; }
        .page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; border-bottom: 2px solid var(--primary-color); padding-bottom: 10px; }
        
        .controls-card { background: #ffffff; padding: 15px; border-radius: 6px; border: 1px solid var(--border-color); margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
        .filter-group { display: flex; align-items: center; gap: 10px; }
        select { padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 4px; font-size: 14px; font-family: inherit; }
        .day-picker { position: relative; }
        .day-picker summary { min-width: 175px; padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 4px; cursor: pointer; font-size: 14px; list-style: none; }
        .day-picker summary::-webkit-details-marker { display: none; }
        .day-picker summary::after { content: '\25BE'; float: right; margin-left: 12px; color: var(--primary-color); }
        .day-picker[open] summary { border-color: var(--primary-color); }
        .day-picker-menu { position: absolute; z-index: 5; top: calc(100% + 5px); left: 0; width: 215px; padding: 8px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 4px; box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12); }
        .day-picker-menu label { display: block; padding: 6px 5px; font-size: 14px; cursor: pointer; }
        .day-picker-menu label:hover { background: #f1f5f9; }
        .day-picker-menu input { accent-color: var(--primary-color); margin-right: 5px; }
        .day-picker-menu button { width: 100%; margin-top: 6px; padding: 7px 10px; border: 0; border-radius: 4px; background: var(--primary-color); color: #ffffff; cursor: pointer; font-family: inherit; }
        
        .btn-print { background: var(--primary-color); color: #fff; border: none; padding: 8px 16px; border-radius: 4px; cursor: pointer; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }

        .routine-tabs { display: flex; gap: 4px; margin-bottom: 12px; border-bottom: 1px solid var(--border-color); }
        .routine-tab { display: inline-flex; align-items: center; gap: 7px; padding: 9px 14px; color: #475569; border-bottom: 3px solid transparent; text-decoration: none; font-size: 14px; }
        .routine-tab:hover, .routine-tab.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }

        .routine-title { display: flex; justify-content: space-between; align-items: center; background: #ffffff; border: 1px solid var(--border-color); border-bottom: 0; padding: 12px 16px; }
        .routine-title h3 { color: var(--primary-color); font-size: 18px; }
        .routine-title span { color: #64748b; font-size: 13px; }

        /* Timetable Grid View */
        .table-wrapper { overflow-x: auto; background: #ffffff; border-radius: 6px; border: 1px solid var(--border-color); }
        .routine-table { width: 100%; min-width: 900px; border-collapse: collapse; table-layout: fixed; text-align: center; font-size: 13px; }
        .routine-class-table .routine-table { min-width: 650px; }
        .routine-table th, .routine-table td { border: 1px solid var(--border-color); padding: 10px 8px; }
        .routine-table th { background-color: var(--primary-color); color: #ffffff; font-weight: 600; white-space: nowrap; }
        .routine-table tbody tr:nth-child(odd):not(.break-row) td { background-color: #f8fbfa; }
        .routine-table tbody tr:nth-child(even):not(.break-row) td { background-color: #eef7f3; }
        .routine-table tbody tr:not(.break-row):hover td { background-color: #d5eee5; }
        .routine-table .period-column, .routine-table .period-cell { width: 145px; }
        .period-cell { background-color: #f1f5f9 !important; color: var(--primary-color) !important; }
        .period-cell small { display: block; color: #475569; font-size: 11px; font-weight: 400; white-space: normal; }
        .subject-tag { font-weight: 600; color: #1e293b; display: block; }
        .teacher-name { display: block; color: #64748b; font-size: 11px; margin-top: 2px; }
        .room-number { display: block; color: #006a4e; font-size: 11px; margin-top: 2px; }
        .empty-slot { color: #cbd5e1; font-weight: normal; }
        .break-row th, .break-row td { background-color: #fff7ed; color: #9a3412; font-weight: 700; }
        .break-row th { width: 145px; }

        @media print {
            @page { size: A4 portrait; margin: 12mm; }
            .gov-top-bar, header, nav, .controls-card, footer { display: none !important; }
            .container { max-width: 100%; margin: 0; padding: 0; }
            .page-header { margin-bottom: 12px; }
            .btn-print { display: none; }
            .routine-title { border: 0; padding: 0 0 8px; }
            .routine-day-table { break-inside: avoid; margin-bottom: 14px; }
            .routine-table { min-width: 0; font-size: 10px; }
            .routine-table th, .routine-table td { padding: 6px 4px; }
            .routine-table th { background-color: #f1f5f9 !important; color: #000 !important; }
        }

        footer { background-color: #2c3e50; color: #ecf0f1; padding: 20px 10%; margin-top: 40px; text-align: center; font-size: 13px; }

        @media (max-width: 640px) {
            body { overflow-x: hidden; }
            header { align-items: flex-start; flex-direction: column; }
            .page-header { align-items: stretch; flex-direction: column; }
            .filter-group { align-items: stretch; flex-direction: column; width: 100%; }
            .day-picker summary, .filter-group select { width: 100%; }
            .day-picker-menu { width: 100%; }
            .routine-title { align-items: flex-start; flex-direction: column; gap: 5px; }
            .routine-tabs { overflow-x: auto; flex-wrap: nowrap; }
            .routine-tab { flex: 0 0 auto; white-space: nowrap; }
        }