@import url(https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap);:root{--primary:navy;--primary-light:#2c3e8a;--secondary:#8b0000;--success:#4cc9f0;--danger:#d90429;--warning:#ffd700;--dark:#1a1a2e;--gray:#6c757d;--light:#f4f6f9;--white:#fff;--border:#e2e8f0;--sidebar-width:250px;--header-height:60px;--transition:all .3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Inter',sans-serif}body{background-color:var(--light);color:var(--dark);font-size:14px;line-height:1.5}h1,h2,h3,h4{color:var(--dark);font-weight:600;margin-bottom:1rem}a{text-decoration:none;color:var(--primary)}.btn{display:inline-block;padding:.5rem 1rem;border:none;border-radius:4px;cursor:pointer;font-weight:500;transition:var(--transition);text-align:center}.btn-primary{background:var(--primary);color:var(--white)}.btn-primary:hover{background:var(--secondary)}.btn-danger{background:var(--danger);color:var(--white)}.btn-danger:hover{background:#d90429}.btn-warning{background:#f0ad4e;color:var(--white)}.btn-warning:hover{background:#eea236}.btn-outline{background:transparent;border:1px solid var(--primary);color:var(--primary)}.btn-outline:hover{background:var(--primary);color:var(--white)}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-control{width:100%;padding:.5rem;border:1px solid var(--border);border-radius:4px;transition:var(--transition)}.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px rgba(67,97,238,.2)}.login-container{height:100vh;display:flex;justify-content:center;align-items:center;background:linear-gradient(135deg,var(--primary),var(--secondary))}.login-card{background:var(--white);padding:2.5rem;border-radius:8px;box-shadow:0 10px 25px rgba(0,0,0,.1);width:100%;max-width:400px}.login-card h2{text-align:center;margin-bottom:1.5rem;color:var(--primary)}.login-logo{display:block;margin:0 auto 1.5rem auto;max-width:150px;height:auto}.alert{padding:.75rem;border-radius:4px;margin-bottom:1rem;display:none}.alert-error{background:#ffe5ec;color:var(--danger);border:1px solid #ffb3c6}.app-container{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--white);height:100%;border-right:1px solid var(--border);display:flex;flex-direction:column;transition:var(--transition)}.sidebar-header{height:var(--header-height);display:flex;align-items:center;padding:0 1.5rem;border-bottom:1px solid var(--border);font-weight:700;font-size:1.2rem;color:var(--primary)}.sidebar-nav{flex:1;padding:1rem 0;overflow-y:auto}.nav-item{padding:.75rem 1.5rem;display:flex;align-items:center;color:var(--gray);cursor:pointer;transition:var(--transition)}.nav-item:hover,.nav-item.active{background:#f8f9fa;color:var(--primary);border-left:3px solid var(--primary)}.nav-item i{margin-right:10px;width:20px;text-align:center}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden}.header{height:var(--header-height);background:var(--white);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;padding:0 2rem}.content-area{flex:1;padding:2rem;overflow-y:auto}.card{background:var(--white);border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.05);padding:1.5rem;margin-bottom:1.5rem}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.table-responsive{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:.75rem 1rem;text-align:left;border-bottom:1px solid var(--border)}th{background:#f8f9fa;font-weight:600;color:var(--gray)}tr:hover{background:#f8f9fa}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);justify-content:center;align-items:center;z-index:1000}.modal.active{display:flex}.modal-content{background:var(--white);border-radius:8px;width:90%;max-width:500px;max-height:90vh;overflow-y:auto;padding:2rem;position:relative}.close-modal{position:absolute;top:1rem;right:1rem;cursor:pointer;font-size:1.5rem;color:var(--gray)}.dashboard-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-bottom:1.5rem}.stat-card{background:var(--white);padding:1.5rem;border-radius:8px;border-left:4px solid var(--primary);box-shadow:0 2px 10px rgba(0,0,0,.05)}.stat-card h3{color:var(--gray);font-size:.9rem;margin-bottom:.5rem}.stat-card .value{font-size:2rem;font-weight:700;color:var(--dark)}.timetable-grid{display:grid;grid-template-columns:80px repeat(5,minmax(0,1fr));gap:1px;background:var(--border);border:1px solid var(--border);width:100%}.timetable-header,.timetable-cell{background:var(--white);padding:5px;text-align:center}.timetable-header{font-weight:bold;background:#f8f9fa}.timetable-period{background:#f8f9fa;font-weight:bold;display:flex;align-items:center;justify-content:center}.timetable-cell{min-height:80px;position:relative;word-break:break-word}.draggable-item{background:var(--primary-light);color:var(--white);padding:5px;border-radius:4px;margin:2px 0;cursor:grab;font-size:.75rem;line-height:1.2;white-space:normal;word-break:break-word}.draggable-item:active{cursor:grabbing}.hidden{display:none!important}.flex{display:flex}.justify-between{justify-content:space-between}.align-center{align-items:center}.mt-1{margin-top:1rem}.mb-1{margin-bottom:1rem}.gap-1{gap:1rem}.site-footer{position:fixed;bottom:0;left:0;width:100%;text-align:center;padding:10px;font-size:.85rem;color:#666;background:#f8f9fa;border-top:1px solid #ddd;z-index:9999;box-sizing:border-box}body{padding-bottom:50px}