:root {
    /* Color Palette - Premium Dark Theme */
    --bg-main: #0B1120;
    --bg-surface: #1E293B;
    --bg-surface-hover: #334155;
    --bg-panel: #0F172A;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    
    --accent-color: #F43F5E;
    --accent-hover: #E11D48;
    --border-color: rgba(255, 255, 255, 0.1);
    
    --font-family: 'Inter', sans-serif;
    --border-radius: 12px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 1400px;
    height: calc(100vh - 40px);
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-text span {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Layout Dual Pane */
.dashboard-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Left Pane: Calendar */
.calendar-pane {
    flex: 2;
    padding: 20px 30px;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

/* Right Pane: Sidebar */
.events-sidebar {
    flex: 1;
    min-width: 350px;
    max-width: 450px;
    background: var(--bg-panel);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 25px 30px 15px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.sidebar-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.categories-list {
    flex: 1;
    overflow-y: auto;
    padding: 20px 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Category Cards Styling */
.category-group {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    overflow: hidden;
    flex-shrink: 0;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    font-weight: 600;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.event-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: background 0.2s;
    cursor: pointer;
}

.event-item:last-child {
    border-bottom: none;
}

.event-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.event-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.event-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

.event-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.event-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.empty-state {
    color: var(--text-secondary);
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
}

/* Calendar Overrides */
.fc {
    color: var(--text-primary);
}
.fc-theme-standard td, .fc-theme-standard th {
    border-color: var(--border-color);
}
.fc-button-primary {
    background-color: var(--bg-surface-hover) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
    text-transform: capitalize;
}
.fc-button-primary:hover, .fc-button-primary:not(:disabled).fc-button-active {
    background-color: var(--bg-surface) !important;
    border-color: var(--accent-color) !important;
    color: var(--accent-color) !important;
}
.fc-day-today {
    background-color: rgba(255, 255, 255, 0.03) !important;
}
.fc-event {
    border: none;
    border-radius: 4px;
    padding: 3px 5px;
    font-size: 0.8em;
    font-weight: 500;
    cursor: pointer;
}

/* Modal Read-Only Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 17, 32, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal {
    background: var(--bg-surface);
    width: 90%;
    max-width: 450px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.modal-overlay.hidden .modal {
    transform: translateY(20px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 600;
}

.btn-icon {
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    padding: 2px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

.btn-icon:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.modal-body {
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.detail-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.detail-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-text {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.5;
    background: rgba(0, 0, 0, 0.2);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    white-space: pre-wrap; /* Preserve line breaks in descriptions */
}

/* Responsiveness for Mobile */
@media (max-width: 768px) {
    .dashboard-layout {
        flex-direction: column;
    }
    .calendar-pane {
        flex: none;
        height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .events-sidebar {
        flex: none;
        height: 50vh;
        min-width: 100%;
        max-width: 100%;
    }
}