:root {
    /* Colors */
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    
    --color-flexible: #22c55e;
    --color-flexible-bg: #dcfce7;
    --color-important: #eab308;
    --color-important-bg: #fef9c3;
    --color-critical: #ef4444;
    --color-critical-bg: #fee2e2;

    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --font-sans: 'Inter', sans-serif;
}

html.dark-mode {
    --bg-main: #0f172a;
    --bg-surface: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    --color-flexible-bg: #14532d;
    --color-important-bg: #713f12;
    --color-critical-bg: #7f1d1d;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.5);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

#app {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    color: var(--primary);
    cursor: pointer;
    transition: opacity 0.2s;
}
.brand:hover {
    opacity: 0.8;
}

.brand h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background-color 0.2s;
    font-size: 0.95rem;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color 0.2s;
}

.btn-outline:hover {
    background-color: var(--bg-main);
}

.btn-ghost {
    background-color: transparent;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.btn-ghost:hover {
    background-color: var(--bg-main);
    color: var(--text-primary);
}

.btn-danger {
    background-color: #fee2e2;
    color: #ef4444;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
}
.btn-danger:hover {
    background-color: #fca5a5;
}

/* Mini Calendar */
.mini-calendar {
    margin-top: 32px;
}
.mini-calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-weight: 600;
    font-size: 0.9rem;
}
.mini-calendar-header button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
}
.mini-calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    text-align: center;
    font-size: 0.8rem;
}
.mini-day {
    padding: 6px 0;
    cursor: pointer;
    border-radius: 4px;
}
.mini-day:hover {
    background-color: var(--bg-main);
}
.mini-day.active {
    background-color: var(--primary);
    color: white;
}

/* Filters */
.filters {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.filters h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}
.filter-option {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}
.color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.color-dot.flexible { background-color: var(--color-flexible); }
.color-dot.important { background-color: var(--color-important); }
.color-dot.critical { background-color: var(--color-critical); }

.admin-toggle-container {
    margin-top: auto;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}
.admin-toggle-container button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.badge-admin {
    background-color: #fee2e2;
    color: #ef4444;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid #fca5a5;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-main);
    overflow: hidden;
}

.main-header {
    height: 80px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.view-toggles {
    display: flex;
    background-color: var(--bg-main);
    border-radius: var(--radius-md);
    padding: 4px;
}
.btn-toggle {
    background: transparent;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.btn-toggle.active {
    background-color: var(--bg-surface);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.week-navigation {
    display: flex;
    align-items: center;
    gap: 16px;
}
.nav-arrows {
    display: flex;
    gap: 4px;
}
.nav-arrows button {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    padding: 4px;
    display: flex;
    color: var(--text-primary);
}
.nav-arrows button:hover {
    background-color: var(--bg-main);
}
.week-navigation h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-left: 16px;
}

/* Calendar Grid */
.calendar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.calendar-header-days {
    display: grid;
    grid-template-columns: 60px repeat(7, 1fr);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

.day-header {
    padding: 16px;
    text-align: center;
    border-left: 1px solid var(--border-color);
}
.day-header.today .day-num {
    background-color: var(--primary);
    color: white;
}
.day-name {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
}
.day-num {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 4px;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
}

.calendar-body {
    flex: 1;
    overflow-y: auto;
    display: flex;
    position: relative;
    background-color: var(--bg-surface);
}

.time-sidebar {
    width: 60px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    position: relative;
}

.time-slot-label {
    height: 60px; /* 1 hour = 60px */
    text-align: right;
    padding-right: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transform: translateY(-8px);
}

.days-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    position: relative;
}

.day-column {
    border-right: 1px solid var(--border-color);
    position: relative;
    /* 24 hours * 60px = 1440px height */
    height: 1440px; 
}

/* Horizontal lines for hours */
.hour-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--border-color);
    pointer-events: none;
}

/* Current time indicator */
.current-time-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #ef4444;
    z-index: 5;
    pointer-events: none;
}
.current-time-line::before {
    content: '';
    position: absolute;
    left: -4px;
    top: -4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #ef4444;
}

/* Event Cards */
.event-card {
    position: absolute;
    left: 4px;
    right: 4px;
    border-radius: 6px;
    padding: 6px 8px;
    font-size: 0.75rem;
    overflow: hidden;
    cursor: grab;
    border-left: 4px solid transparent;
    box-shadow: var(--shadow-sm);
    transition: transform 0.1s, box-shadow 0.1s;
    z-index: 10;
}
.event-card * {
    pointer-events: none; /* Let the card handle clicks and drags, not its children */
}
.event-card:hover {
    box-shadow: var(--shadow-md);
    z-index: 11;
}
.event-card:active {
    cursor: grabbing;
}

.event-card.flexible {
    background-color: var(--color-flexible-bg);
    border-left-color: var(--color-flexible);
    color: var(--text-primary);
}
.event-card.important {
    background-color: var(--color-important-bg);
    border-left-color: var(--color-important);
    color: var(--text-primary);
}
.event-card.critical {
    background-color: var(--color-critical-bg);
    border-left-color: var(--color-critical);
    color: var(--text-primary);
}
.event-title {
    font-weight: 600;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.event-time {
    opacity: 0.8;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}
.modal-overlay.hidden {
    display: none;
}
.modal {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}
.modal.hidden {
    display: none;
}
.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}
.btn-close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}
.modal-body {
    padding: 24px;
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.form-group input[type="text"],
.form-group input[type="date"],
.form-group input[type="time"],
.form-group input[type="password"],
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
}
.form-row {
    display: flex;
    gap: 16px;
}
.form-row .form-group {
    flex: 1;
}
.modal-footer {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}
.hidden {
    display: none !important;
}
.recurrence-box, .token-box {
    background-color: var(--bg-main);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-top: 8px;
    border: 1px solid var(--border-color);
}

/* Monthly View */
.month-view {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-surface);
    z-index: 20;
    display: flex;
    flex-direction: column;
}
.month-header-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}
.month-header-day {
    padding: 12px;
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
}
.month-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: 1fr;
}
.month-cell {
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 8px;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: background-color 0.2s;
}
.month-cell:hover {
    background-color: var(--bg-main);
}
.month-cell.dimmed {
    opacity: 0.4;
}
.month-cell-date {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 8px;
    align-self: flex-end;
}
.month-cell-date.today {
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.month-event-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    font-weight: 500;
    background-color: var(--bg-main);
    padding: 4px 8px;
    border-radius: 4px;
    margin-top: auto;
}
.month-event-dots {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}
.month-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}
.month-dot.flexible { background-color: var(--color-flexible); }
.month-dot.important { background-color: var(--color-important); }
.month-dot.critical { background-color: var(--color-critical); }