:root {
    --primary: #2563eb;
    --primary-light: #eff6ff;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #cbd5e1;
    --teal-dark: #46bdc6;
    --teal-mid: #6acad1;
    --teal-light: #8af0f8;
    --frozen-bg: #f0fdff;
    --header-bg: #ffffff;
    --hover-bg: #e0f2fe;
    --even-row: #f8fafc;
    --input-bg: #ffffff;
    --badge-absent-bg: #f1f5f9;
    --badge-absent-text: #475569;
}

[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-light: #1e3a8a;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --teal-dark: #0f766e;
    --teal-mid: #115e59;
    --teal-light: #134e4a;
    --frozen-bg: #1e293b;
    --header-bg: #1e293b;
    --hover-bg: #334155;
    --even-row: #172033;
    --input-bg: #0f172a;
    --badge-absent-bg: #334155;
    --badge-absent-text: #cbd5e1;
}

* {
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--border);
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-actions {
    display: flex;
    gap: 6px;
    align-items: center;
}

.back-btn, .theme-toggle-btn {
    background: var(--card-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 5px 10px;
    font-weight: 600;
    font-size: 12px;
    border-radius: 6px;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header h2 {
    font-size: 14px;
    color: var(--primary);
    font-weight: 700;
}

.container {
    max-width: 100%;
    margin: 12px auto;
    padding: 0 8px;
    width: 100%;
    flex: 1;
}

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 16px;
    max-width: 340px;
    margin: 30px auto;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.auth-card h3 {
    font-size: 15px;
    color: var(--text-main);
    margin-bottom: 12px;
}

.auth-card input {
    width: 100%;
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    text-align: center;
    outline: none;
    background: var(--input-bg);
    color: var(--text-main);
}

.auth-card button {
    width: 100%;
    background: var(--primary);
    color: #ffffff;
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.table-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: auto;
    max-height: 80vh;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    position: relative;
}

table {
    border-collapse: separate;
    border-spacing: 0;
    width: max-content;
    min-width: 100%;
    text-align: center;
    font-size: 12px;
}

th, td {
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
    border-left: 1px solid var(--border);
    white-space: nowrap;
    background-color: var(--card-bg);
    color: var(--text-main);
}

/* Freeze Header Row 1 (Dates) */
tr:nth-child(1) th {
    background: var(--teal-dark);
    color: #ffffff;
    font-weight: 700;
    position: sticky;
    top: 0;
    z-index: 30;
    border-bottom: 1px solid var(--border);
}

/* Freeze Header Row 2 (Filters) */
tr:nth-child(2) th {
    background: var(--teal-mid);
    color: #ffffff;
    font-weight: 600;
    position: sticky;
    top: 35px;
    z-index: 30;
    border-bottom: 2px solid var(--border);
    padding: 4px 6px;
}

.th-controls {
    display: flex;
    gap: 4px;
    font-size: 10px;
    justify-content: center;
    align-items: center;
}

.th-controls select, .th-controls button {
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 10px;
    padding: 2px 4px;
    font-family: 'Cairo', sans-serif;
    color: var(--text-main);
    cursor: pointer;
    outline: none;
}

.col-id {
    width: 38px !important;
    min-width: 38px !important;
    max-width: 38px !important;
    text-align: center !important;
}

/* Freeze Column 1 (م) */
td:nth-child(1), tr:nth-child(1) th:nth-child(1), tr:nth-child(2) th:nth-child(1) {
    position: sticky;
    right: 0;
    z-index: 20;
    background-color: var(--frozen-bg);
}
tr:nth-child(1) th:nth-child(1), tr:nth-child(2) th:nth-child(1) {
    z-index: 50;
}
tr:nth-child(1) th:nth-child(1) { background: var(--teal-dark); }
tr:nth-child(2) th:nth-child(1) { background: var(--teal-mid); }

/* Freeze Column 2 (الاسم) */
td:nth-child(2), tr:nth-child(1) th:nth-child(2), tr:nth-child(2) th:nth-child(2) {
    position: sticky;
    right: 38px;
    z-index: 20;
    background-color: var(--frozen-bg);
    text-align: right;
}
tr:nth-child(1) th:nth-child(2), tr:nth-child(2) th:nth-child(2) {
    z-index: 50;
}
tr:nth-child(1) th:nth-child(2) { background: var(--teal-dark); }
tr:nth-child(2) th:nth-child(2) { background: var(--teal-mid); }

.total-cell {
    background-color: var(--teal-light) !important;
    color: var(--text-main) !important;
    font-weight: 700;
}

.total-header {
    background-color: var(--teal-mid) !important;
    color: #ffffff !important;
}

tr:nth-child(even) td:not(:nth-child(1)):not(:nth-child(2)):not(.total-cell) { 
    background-color: var(--even-row); 
}

tr:hover td { 
    background-color: var(--hover-bg) !important; 
}

.badge-present {
    background-color: #dcfce7;
    color: #166534;
    padding: 3px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 11px;
    display: inline-block;
    cursor: pointer;
    user-select: none;
}

[data-theme="dark"] .badge-present {
    background-color: #064e3b;
    color: #a7f3d0;
}

.badge-absent {
    background-color: var(--badge-absent-bg);
    color: var(--badge-absent-text);
    padding: 3px 10px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 11px;
    display: inline-block;
    cursor: pointer;
    user-select: none;
}

.editable-cell {
    cursor: pointer;
}

.editable-text-input {
    width: 100%;
    border: 1px solid var(--primary);
    border-radius: 4px;
    padding: 2px 4px;
    font-size: 12px;
    font-family: 'Cairo', sans-serif;
    outline: none;
    background: var(--input-bg);
    color: var(--text-main);
}

.loading-msg, .error-msg {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 13px;
}

.error-msg { color: #dc2626; }