:root {
    --bg-color: #f4f7f6;
    --text-color: #333;
    --primary-color: #007bff;
    --card-bg: #fff;
    --border-color: #ddd;
}
body.dark-mode {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #bb86fc;
    --card-bg: #1e1e1e;
    --border-color: #333;
}
body {
    font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0; padding: 0;
    transition: 0.3s;
}
header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 15px 20px; background: var(--primary-color); color: white;
}
.tabs {
    display: flex; overflow-x: auto; background: var(--card-bg);
    padding: 10px; box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.tab-btn {
    border: none; background: none; padding: 10px 15px; cursor: pointer;
    color: var(--text-color); font-weight: bold; white-space: nowrap;
}
.tab-btn.active { border-bottom: 3px solid var(--primary-color); color: var(--primary-color); }
.tab-content { display: none; padding: 20px; }
.tab-content.active { display: block; }
.card { background: var(--card-bg); padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); margin-bottom: 20px;}
input, button { padding: 10px; margin: 5px 0; width: 100%; border: 1px solid var(--border-color); border-radius: 5px; box-sizing: border-box; background: var(--card-bg); color: var(--text-color);}
button { background: var(--primary-color); color: white; cursor: pointer; font-weight: bold; }
.checkbox-group label { display: inline-block; margin-left: 15px; }

/* أوقات الأوف */
table { width: 100%; border-collapse: collapse; margin-top: 10px; background: var(--card-bg);}
th, td { border: 1px solid var(--border-color); padding: 10px; text-align: center; }
td.on { background-color: #c8e6c9; color: #2e7d32; cursor: pointer; } 
td.off { background-color: #ffcdd2; color: #c62828; cursor: pointer; } 

/* الذكاء الاصطناعي */
.chat-box { height: 350px; overflow-y: auto; background: var(--card-bg); padding: 15px; border: 1px solid var(--border-color); border-radius: 5px; margin-bottom: 10px; }
.msg { padding: 10px 15px; margin: 5px 0; border-radius: 10px; max-width: 80%; line-height: 1.5; }
.msg.ai { background: #e3f2fd; color: #000; align-self: flex-start; border-bottom-right-radius: 0; }
.msg.user { background: var(--primary-color); color: white; margin-left: auto; border-bottom-left-radius: 0; }
.chat-input { display: flex; gap: 10px; }
.chat-input button { width: 60px; }

/* السحب والإفلات */
.drag-item { padding: 10px; margin: 5px; background: #ffe082; color: #000; border-radius: 5px; cursor: grab; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.2);}
.drag-zone { min-height: 60px; border: 2px dashed var(--border-color); padding: 5px; vertical-align: top; }

/* الطباعة A4 */
@media print {
    body * { visibility: hidden; }
    #schedule, #schedule * { visibility: visible; }
    #schedule { position: absolute; left: 0; top: 0; width: 100%; }
    .action-buttons, .tabs, header { display: none !important; }
    @page { size: A4 portrait; margin: 10mm; }
    .drag-item { border: 1px solid #000; box-shadow: none; background: transparent; }
}