:root {
    --primary: #0f172a;
    --accent-lab: #10b981;
    --accent-lec: #3b82f6;
    --bg: #f8fafc;
    --card: #ffffff;
}

body { font-family: 'Inter', sans-serif; background: var(--bg); }

.schedule-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.week-card {
    background: var(--card);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.action-row { display: flex; gap: 10px; flex: 2; justify-content: flex-end; }

.btn-lecture, .btn-lab {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    text-align: left;
    min-width: 280px;
}

.btn-lecture { background: #eff6ff; color: #1e40af; }
.btn-lab { background: #ecfdf5; color: #065f46; }

.btn-lecture:hover { background: #dbeafe; }
.btn-lab:hover { background: #d1fae5; }

/* DRAWER SYSTEM */
.drawer-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.4);
    opacity: 0; visibility: hidden;
    transition: 0.3s ease;
    z-index: 2000;
}
.drawer-overlay.visible { opacity: 1; visibility: visible; }

.drawer-panel {
    position: fixed;
    right: -450px; top: 0;
    width: 450px; height: 100%;
    background: white;
    box-shadow: -5px 0 25px rgba(0,0,0,0.15);
    transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 40px;
    overflow-y: auto;
}
.drawer-panel.open { right: 0; }

.drawer-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 800;
    margin-bottom: 1rem;
}
.drawer-badge.lecture { background: #dbeafe; color: #1e40af; }
.drawer-badge.laboratory { background: #d1fae5; color: #065f46; }

.diagram-placeholder {
    margin-top: 20px;
    padding: 30px;
    background: #f1f5f9;
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    color: #64748b;
    text-align: center;
    font-style: italic;
}