:root {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --primary: #4f46e5;
    --primary-light: #e0e7ff;

    /* Student Sidebar Indicators Base Defaults */
    --student-1: #8b5cf6; 
    --student-2: #3b82f6; 

    /* Subject Base Colors */
    --sub-math: #ef4444;
    --sub-reading: #ec4899;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Styling */
aside {
    width: 280px;
    background-color: var(--bg-card);
    border-right: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 2rem;
    overflow-y: auto;
    flex-shrink: 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pill-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pill-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--bg-main);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    border-left: 4px solid transparent;
    gap: 0.25rem;
}

.editable-name {
    outline: none;
    padding: 2px 4px;
    border-radius: 3px;
    flex: 1;
    margin-right: 4px;
    background: transparent;
    border: 1px dashed transparent;
    white-space: nowrap;
    overflow: hidden;
}

.editable-name:focus {
    background: #ffffff;
    border-color: var(--border-color);
}

.color-picker {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    padding: 0;
    background: transparent;
    flex-shrink: 0;
}

.btn-delete {
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
    padding: 2px;
    font-size: 0.85rem;
    opacity: 0.6;
    transition: opacity 0.2s;
    flex-shrink: 0;
}
.btn-delete:hover { opacity: 1; }

/* Main Workspace Content */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

header {
    background-color: var(--bg-card);
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    flex-wrap: wrap;
}

.week-indicator-bubble, .date-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-main);
    padding: 0.35rem 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.date-picker-wrapper label, .week-indicator-bubble span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.start-date-input {
    border: none;
    background: transparent;
    font-size: 0.9rem;
    color: var(--text-main);
    font-weight: 700;
    outline: none;
    cursor: pointer;
}

.current-week-display {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--primary);
}

.btn {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: all 0.2s;
}
.btn:hover {
    background-color: var(--bg-main);
    border-color: var(--text-muted);
}
.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
}
.btn-primary:hover { background-color: #4338ca; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; border-radius: 0.25rem; }

.status-indicator {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
}

/* Continuous Scroll Matrix Layout Grid */
.calendar-workspace-container {
    flex: 1;
    padding: 0 1.5rem 1.5rem 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    scroll-behavior: smooth;
}

/* Sticky Header Panel Row wrapper */
.sticky-header-row {
    display: grid;
    grid-template-columns: repeat(5, minmax(200px, 1fr));
    min-width: 1000px;
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-main);
    padding-top: 1.5rem;
    padding-bottom: 0.5rem;
}

.grid-header-cell {
    background: #f8fafc;
    padding: 0.85rem;
    font-weight: 700;
    text-align: center;
    border: 2px solid var(--border-color);
    border-right: none;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
}
.grid-header-cell:last-child {
    border-right: 2px solid var(--border-color);
    border-top-right-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
}
.grid-header-cell:first-child {
    border-top-left-radius: 0.5rem;
    border-bottom-left-radius: 0.5rem;
}

.header-date-subtext {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
    text-transform: none;
}

/* Scrollable Calendar Sheet Matrix */
.calendar-grid-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    min-width: 1000px;
    padding-bottom: 10rem;
}

/* Week Track Styling */
.week-block-wrapper {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.week-block-title-banner {
    background: #f8fafc;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.student-row-group {
    display: grid;
    grid-template-columns: repeat(5, minmax(200px, 1fr));
    border-bottom: 2px dashed var(--border-color);
}
.student-row-group:last-child {
    border-bottom: none;
}

/* Day Block Matrix Cells */
.day-block {
    padding: 0.75rem;
    border-right: 1px solid var(--border-color);
    border-top: 4px solid var(--student-color, var(--border-color));
    background: #fafafa;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 200px;
    transition: background-color 0.2s, border-top-color 0.2s;
    position: relative;
}
.day-block:last-child {
    border-right: none;
}

.day-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.25rem;
}

.cell-date-stamp {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-main);
    padding: 2px 6px;
    border-radius: 4px;
}

.exception-buttons-group {
    display: flex;
    gap: 0.25rem;
}

/* Exception Day Overrides */
.day-block.vacation-block { background: #fffbeb; }
.day-block.vacation-block .task-list,
.day-block.vacation-block .block-scheduling-actions { display: none !important; }

.day-block.sick-block { background: #fef2f2; }
.day-block.sick-block .task-list,
.day-block.sick-block .block-scheduling-actions { display: none !important; }

.day-block.co-op-block { background: #fef2f2; }
.day-block.co-op-block .task-list,
.day-block.co-op-block .block-scheduling-actions { display: none !important; }


.exception-notice-overlay {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 1rem 0.5rem;
    border-radius: 0.375rem;
    border: 1px dashed transparent;
}
.vacation-block .exception-notice-overlay {
    background: #fef3c7;
    border-color: #f59e0b;
    color: #78350f;
}
.sick-block .exception-notice-overlay {
    background: #fee2e2;
    border-color: #ef4444;
    color: #991b1b;
}

.exception-icon {
    font-size: 1.25rem;
    margin-bottom: 0.35rem;
}
.exception-title-tag {
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.exception-reason-text {
    font-size: 0.8rem;
    margin-top: 0.25rem;
    font-style: italic;
    font-weight: 500;
    word-break: break-word;
}

.block-scheduling-actions {
    display: flex;
    gap: 0.25rem;
    width: 100%;
    margin-top: auto;
}
.block-scheduling-actions .btn {
    width: 100%;
    justify-content: center;
}

/* Lesson Task Items */
.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 60px;
}

.task-card {
    background: white;
    border: 1px solid var(--border-color);
    border-left: 4px solid transparent;
    border-radius: 0.375rem;
    padding: 0.6rem;
    font-size: 0.85rem;
    cursor: grab;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: opacity 0.2s, background-color 0.2s;
}
.task-card:active { cursor: grabbing; }

.task-card.assignment-completed {
    background-color: #f8fafc;
    opacity: 0.65;
}
.task-card.assignment-completed .task-details {
    text-decoration: line-through;
    color: var(--text-muted);
}

.card-top-row {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.assignment-checkbox {
    width: 15px;
    height: 15px;
    margin-top: 2px;
    cursor: pointer;
    flex-shrink: 0;
}

.task-details {
    font-weight: 600;
    flex: 1;
    outline: none;
    color: var(--text-main);
}

.btn-card-delete {
    background: transparent;
    border: none;
    color: #94a3b8;
    cursor: pointer;
    padding: 0 2px;
    font-size: 0.85rem;
    transition: color 0.2s;
    margin-left: auto;
}
.btn-card-delete:hover { color: #ef4444; }

.task-meta {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
    padding-left: 1.4rem;
}

.card-selector {
    font-size: 0.7rem;
    border: 1px solid var(--border-color);
    background: #f1f5f9;
    border-radius: 0.25rem;
    padding: 2px 4px;
    cursor: pointer;
    outline: none;
    max-width: 110px;
}

.subject-badge {
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
    color: white;
    font-weight: 700;
}

/* Modal Overlay Configuration */
.modal-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(2px);
}
.modal-card {
    background: white;
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.modal-card h3 { font-size: 1.1rem; color: var(--text-main); font-weight: 700; }
.modal-field { display: flex; flex-direction: column; gap: 0.35rem; }
.modal-field label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }
.modal-input { padding: 0.5rem; border-radius: 0.375rem; border: 1px solid var(--border-color); font-size: 0.9rem; outline: none; }
.modal-input:focus { border-color: var(--primary); }
.modal-actions { display: flex; gap: 0.5rem; margin-top: 0.5rem; }
.modal-actions .btn { flex: 1; justify-content: center; }

/* Toast notifications */
.toast-notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #1e293b;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    z-index: 3000;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    pointer-events: none;
}
.toast-notification.show { opacity: 1; transform: translateY(0); }

@media print {
    aside, header, .toolbar, .day-block-header, .block-scheduling-actions, .card-selector, .btn-card-delete, .modal-overlay, .assignment-checkbox, .week-block-title-banner button { display: none !important; }
    body { background: white; color: black; }
    main { overflow: visible; display: block; }
    .calendar-workspace-container { padding: 0; overflow: visible; display: block; }
    .calendar-grid-wrapper { min-width: 100%; height: auto; overflow: visible; gap: 3rem; }
    .week-block-wrapper { page-break-inside: avoid; border: 2px solid #000; box-shadow: none; }
    .sticky-header-row { display: grid; position: relative; padding-top: 0; }
    .grid-header-cell { border: 2px solid #000; border-right: none; background: #fff !important; color: #000; }
    .day-block { border-right: 1px solid #000; background: #fff !important; min-height: auto; }
    .task-card { border: 1px solid #000; background: #fff !important; color: #000 !important; box-shadow: none; opacity: 1 !important; }
    .task-meta { padding-left: 0; }
    .subject-badge { border: 1px solid #000; color: #000 !important; background: transparent !important; }
}

/* Save-status indicator states (added for cloud sync) */
.status-indicator.is-error { color: #dc2626; font-weight: 600; }
.status-indicator.is-pending { color: var(--text-muted); }