:root {
            --primary-color: #4361ee;
            --secondary-color: #3f37c9;
            --accent-color: #4895ef;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --success-color: #4cc9f0;
            --warning-color: #f8961e;
            --danger-color: #f72585;
            --text-color: #212529;
            --bg-color: #f5f7fa;
            --card-bg: white;
            --border-color: #e9ecef;
        }

        .dark-mode {
            --primary-color: #4895ef;
            --secondary-color: #4361ee;
            --accent-color: #3f37c9;
            --light-color: #343a40;
            --dark-color: #f8f9fa;
            --text-color: #f8f9fa;
            --bg-color: #212529;
            --card-bg: #2b3035;
            --border-color: #495057;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            transition: background-color 0.3s, color 0.3s;
        }
        
        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            min-height: 100vh;
        }
        
        .container {
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 20px;
        }
        
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .logo {
            width: 50px;
            height: 50px;
            object-fit: contain;
        }
        
        .header-text h1 {
            color: var(--primary-color);
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
        }
        
        .header-text p {
            color: var(--text-color);
            opacity: 0.8;
            font-size: 1.1rem;
        }
        
        .calendar-container {
            background: var(--card-bg);
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            margin-bottom: 2rem;
        }
        
        .calendar-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem;
            background-color: var(--primary-color);
            color: white;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .calendar-nav {
            display: flex;
            gap: 1rem;
            align-items: center;
        }
        
        .calendar-nav button {
            background: rgba(255, 255, 255, 0.2);
            border: none;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .calendar-nav button:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        .view-options {
            display: flex;
            gap: 0.5rem;
        }
        
        .view-options button {
            background: rgba(255, 255, 255, 0.2);
            border: none;
            color: white;
            padding: 0.5rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .view-options button.active {
            background: white;
            color: var(--primary-color);
        }
        
        .view-options button:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        .calendar-week {
            display: flex;
            border-bottom: 1px solid var(--border-color);
        }
        
        .calendar-day {
            flex: 1;
            text-align: center;
            padding: 1rem 0;
            font-weight: 600;
            color: var(--text-color);
            position: relative;
        }
        
        .calendar-day.today {
            color: var(--primary-color);
        }
        
        .calendar-day.today::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 50%;
            height: 3px;
            background-color: var(--primary-color);
        }
        
        .calendar-day .day-number {
            display: inline-block;
            width: 30px;
            height: 30px;
            line-height: 30px;
            border-radius: 50%;
            margin-top: 0.5rem;
        }
        
        .calendar-day.today .day-number {
            background-color: var(--primary-color);
            color: white;
        }
        
        .weather-icon {
            width: 24px;
            height: 24px;
            margin-top: 0.25rem;
        }
        
        .calendar-grid {
            display: grid;
            grid-template-columns: 100px repeat(7, 1fr);
        }
        
        .time-slot {
            padding: 1rem;
            border-right: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            font-size: 0.9rem;
            color: var(--text-color);
            opacity: 0.8;
        }
        
        .calendar-slot {
            padding: 0.5rem;
            border-right: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            min-height: 80px;
            position: relative;
            background-color: var(--card-bg);
        }
        
        .calendar-slot:hover {
            background-color: rgba(0, 0, 0, 0.02);
        }
        
        .dark-mode .calendar-slot:hover {
            background-color: rgba(255, 255, 255, 0.02);
        }
        
        .event {
            background-color: var(--accent-color);
            color: white;
            padding: 0.5rem;
            border-radius: 5px;
            margin-bottom: 0.25rem;
            font-size: 0.85rem;
            cursor: pointer;
            transition: all 0.2s ease;
            overflow: hidden;
            position: relative;
            z-index: 1;
        }
        
        .event:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
        }
        
        .event.meeting {
            background-color: var(--primary-color);
        }
        
        .event.work {
            background-color: var(--success-color);
        }
        
        .event.break {
            background-color: var(--warning-color);
        }
        
        .event.personal {
            background-color: var(--danger-color);
        }
        
        .event.reminder {
            background-color: #7209b7;
        }
        
        .event-title {
            font-weight: 600;
            margin-bottom: 0.2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .event-time {
            font-size: 0.75rem;
            opacity: 0.9;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        
        .event-actions {
            position: absolute;
            top: 0.2rem;
            right: 0.2rem;
            display: none;
        }
        
        .event:hover .event-actions {
            display: flex;
            gap: 0.2rem;
        }
        
        .event-actions button {
            background: rgba(0, 0, 0, 0.2);
            border: none;
            color: white;
            width: 18px;
            height: 18px;
            border-radius: 3px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 0.7rem;
        }
        
        .event-actions button:hover {
            background: rgba(0, 0, 0, 0.3);
        }
        
        .add-event {
            position: absolute;
            bottom: 0.5rem;
            right: 0.5rem;
            background: rgba(0, 0, 0, 0.05);
            border: none;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--text-color);
            transition: all 0.2s ease;
            opacity: 0;
        }
        
        .calendar-slot:hover .add-event {
            opacity: 1;
        }
        
        .add-event:hover {
            background: var(--primary-color);
            color: white;
        }
        
        /* Month view */
        .month-view {
            display: none;
            padding: 1rem;
        }
        
        .month-view.active {
            display: block;
        }
        
        .month-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 1px;
            background-color: var(--border-color);
        }
        
        .month-day {
            background-color: var(--card-bg);
            min-height: 120px;
            padding: 0.5rem;
            position: relative;
        }
        
        .month-day-header {
            font-weight: bold;
            margin-bottom: 0.5rem;
            text-align: right;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .month-day.today .month-day-header {
            color: var(--primary-color);
        }
        
        .month-day.other-month {
            opacity: 0.5;
        }
        
        .weather-info {
            font-size: 0.7rem;
            display: flex;
            align-items: center;
            gap: 0.25rem;
            margin-top: 0.25rem;
        }
        
        /* Week view */
        .week-view {
            display: none;
        }
        
        .week-view.active {
            display: block;
        }
        
        /* Day view */
        .day-view {
            display: none;
            padding: 1rem;
        }
        
        .day-view.active {
            display: block;
        }
        
        .day-time-slot {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            min-height: 60px;
        }
        
        .day-time {
            width: 100px;
            padding: 0.5rem;
            font-size: 0.9rem;
            color: var(--text-color);
            opacity: 0.8;
        }
        
        .day-events {
            flex: 1;
            padding: 0.5rem;
            position: relative;
        }
        
        /* Event modal */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background-color: var(--card-bg);
            border-radius: 10px;
            width: 90%;
            max-width: 600px;
            max-height: 90vh;
            overflow-y: auto;
            box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
            animation: modalFadeIn 0.3s;
        }
        
        @keyframes modalFadeIn {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .modal-header {
            padding: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .modal-body {
            padding: 1.5rem;
        }
        
        .modal-footer {
            padding: 1rem 1.5rem;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: flex-end;
            gap: 1rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        
        .form-control {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            background-color: var(--card-bg);
            color: var(--text-color);
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
        }
        
        .btn {
            padding: 0.75rem 1.5rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.2s ease;
            border: none;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        
        .btn-secondary {
            background-color: var(--light-color);
            color: var(--text-color);
        }
        
        .btn-secondary:hover {
            background-color: #e2e6ea;
        }
        
        .btn-danger {
            background-color: var(--danger-color);
            color: white;
        }
        
        .btn-danger:hover {
            background-color: #e51778;
        }
        
        .color-options {
            display: flex;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }
        
        .color-option {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid transparent;
        }
        
        .color-option.selected {
            border-color: var(--text-color);
        }
        
        /* Image upload section */
        .image-upload {
            margin-top: 1rem;
            border: 1px dashed var(--border-color);
            border-radius: 5px;
            padding: 1rem;
            text-align: center;
        }
        
        .image-preview {
            max-width: 100%;
            max-height: 200px;
            margin-top: 1rem;
            display: none;
        }
        
        .pexels-search {
            display: flex;
            gap: 0.5rem;
            margin-top: 1rem;
        }
        
        .pexels-results {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0.5rem;
            margin-top: 1rem;
            max-height: 200px;
            overflow-y: auto;
        }
        
        .pexels-image {
            width: 100%;
            height: 80px;
            object-fit: cover;
            cursor: pointer;
            border-radius: 3px;
            transition: transform 0.2s;
        }
        
        .pexels-image:hover {
            transform: scale(1.05);
        }
        
        /* Theme selector */
        .theme-selector {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            z-index: 100;
        }
        
        .theme-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
        }
        
        .theme-btn:hover {
            transform: scale(1.1);
        }
        
        .theme-options {
            position: absolute;
            bottom: 60px;
            right: 0;
            background-color: var(--card-bg);
            border-radius: 10px;
            padding: 1rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            display: none;
            width: 200px;
        }
        
        .theme-options.show {
            display: block;
            animation: fadeIn 0.3s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .theme-option {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.5rem;
            cursor: pointer;
            border-radius: 5px;
        }
        
        .theme-option:hover {
            background-color: rgba(0, 0, 0, 0.05);
        }
        
        .theme-color {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            border: 1px solid var(--border-color);
        }
        
        /* Search and filters */
        .toolbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .search-box {
            flex: 1;
            max-width: 400px;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            background-color: var(--card-bg);
            color: var(--text-color);
        }
        
        .search-box i {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-color);
            opacity: 0.7;
        }
        
        .filter-options {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        
        .filter-btn {
            padding: 0.5rem 1rem;
            border-radius: 20px;
            cursor: pointer;
            font-size: 0.85rem;
            border: 1px solid var(--border-color);
            background-color: var(--card-bg);
            color: var(--text-color);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .filter-btn.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .filter-btn .color-indicator {
            width: 12px;
            height: 12px;
            border-radius: 50%;
        }
        /* Responsive Breakpoints */
/* Mobile First Approach (default styles are for mobile) */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
    .container {
        padding: 0 30px;
    }
    
    .calendar-nav button {
        padding: 0.5rem 1.2rem;
    }
    
    .event {
        font-size: 0.9rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .header {
        margin-bottom: 2.5rem;
    }
    
    .calendar-header {
        padding: 1.5rem 2rem;
    }
    
    .calendar-day {
        padding: 1.2rem 0;
    }
    
    .month-day {
        min-height: 140px;
    }
    
    .toolbar {
        margin-bottom: 2rem;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .container {
        margin: 3rem auto;
    }
    
    .header-text h1 {
        font-size: 2.8rem;
    }
    
    .calendar-grid {
        grid-template-columns: 120px repeat(7, 1fr);
    }
    
    .time-slot {
        padding: 1.2rem;
    }
    
    .month-grid {
        gap: 2px;
    }
    
    .month-day {
        min-height: 150px;
        padding: 0.75rem;
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .header-text h1 {
        font-size: 3rem;
    }
    
    .calendar-slot {
        min-height: 100px;
    }
    
    .month-day {
        min-height: 160px;
    }
}

/* Mobile-specific adjustments (max-width: 575.98px) */
@media (max-width: 575.98px) {
    .container {
        margin: 1rem auto;
        padding: 0 15px;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 1.5rem;
    }
    
    .logo-container {
        margin-bottom: 0.5rem;
    }
    
    .header-text h1 {
        font-size: 2rem;
    }
    
    .header-text p {
        font-size: 1rem;
    }
    
    .calendar-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1rem;
    }
    
    .calendar-nav {
        width: 100%;
        justify-content: space-between;
    }
    
    .calendar-nav button {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    .view-options {
        width: 100%;
        justify-content: center;
    }
    
    .calendar-week {
        display: none;
    }
    
    .calendar-grid {
        grid-template-columns: 80px repeat(7, 1fr);
        overflow-x: auto;
    }
    
    .time-slot {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
    
    .calendar-slot {
        min-height: 60px;
        min-width: 80px;
    }
    
    .event {
        font-size: 0.7rem;
        padding: 0.3rem;
    }
    
    .event-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.2rem;
    }
    
    .add-event {
        width: 20px;
        height: 20px;
        font-size: 0.8rem;
    }
    
    /* Month view adjustments for mobile */
    .month-grid {
        grid-template-columns: repeat(7, 1fr);
    }
    
    .month-day {
        min-height: 80px;
        padding: 0.3rem;
        font-size: 0.8rem;
    }
    
    .month-day-header {
        flex-direction: column;
        align-items: flex-end;
        gap: 0.2rem;
    }
    
    .weather-info {
        display: none;
    }
    
    /* Modal adjustments */
    .modal-content {
        width: 95%;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
    
    .theme-selector {
        bottom: 1rem;
        right: 1rem;
    }
    
    .theme-btn {
        width: 40px;
        height: 40px;
    }
    
    .theme-options {
        width: 160px;
    }
    
    /* Toolbar adjustments */
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box {
        max-width: 100%;
        width: 100%;
    }
    
    .filter-options {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
}

/* Tablet-specific adjustments (between 576px and 991.98px) */
@media (min-width: 576px) and (max-width: 991.98px) {
    .month-day {
        min-height: 120px;
    }
    
    .event {
        font-size: 0.8rem;
    }
    
    .calendar-slot {
        min-height: 80px;
    }
    
    .toolbar {
        flex-wrap: nowrap;
    }
    
    .search-box {
        min-width: 250px;
    }
}

/* Hide some elements on mobile */
@media (max-width: 767.98px) {
    .day-number {
        display: none;
    }
    
    .calendar-day.today::after {
        display: none;
    }
    
    .calendar-day.today .day-number {
        display: inline-block;
    }
}

/* Special adjustments for landscape phones */
@media (max-width: 767.98px) and (orientation: landscape) {
    .calendar-slot {
        min-height: 50px;
    }
    
    .month-day {
        min-height: 70px;
    }
    
    .event {
        font-size: 0.6rem;
    }
}