/* Page Header */
        .page-header {
            height: 50vh;
            display: flex;
            align-items: center;
            justify-content: flex-start;
            text-align: left;
            color: white;
            position: relative;
            overflow: hidden;
            margin-top: 70px;
            background: url('../images/Activity.jpg') center/cover no-repeat;
        }

        .page-header-content h1 {
            font-size: 3.5rem;
            margin-bottom: 1rem;
            text-align: left;
        }

        .page-header-content p {
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0;
            text-align: left;
        }

        /* Activity Section */
        .activity-section {
            padding: 6rem 0 4rem;
            background: var(--bg);
            scroll-margin-top: 100px;
        }

        .activity-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: start;
        }

        .activity-flyer {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .activity-flyer:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
        }

        .activity-flyer img {
            width: 100%;
            height: 450px;
            display: block;
        }

        .activity-details {
            padding: 2rem 0;
        }

        .activity-title {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }

        .activity-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 2rem;
            padding-bottom: 2rem;
            border-bottom: 2px solid var(--light);
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .meta-icon {
            color: var(--secondary);
            font-size: 1.8rem;
        }

        .meta-text h4 {
            font-size: 1.2rem;
            color: var(--text-light);
            margin-bottom: 0.1rem;
        }

        .meta-text p {
            font-size: 0.8rem;
            color: var(--primary);
            font-weight: 600;
        }

        .activity-description {
            margin-bottom: 2.5rem;
        }

        .activity-description p {
            color: var(--text-light);
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 1.5rem;
        }

        .register-btn {
            display: inline-block;
            margin-top: 1rem;
        }

        /* Past Events Section */
        .past-events-section {
            padding: 1rem 0 4rem;
            background: var(--bg);
        }

        .past-event-card {
            display: flex;
            align-items: center;
            gap: 2rem;
            max-width: 900px;
            margin: 0 auto;
            padding: 1.5rem;
            background: var(--card-bg);
            border: 1px solid var(--light);
            border-radius: 15px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .past-event-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
        }

        .past-event-flyer {
            flex-shrink: 0;
            width: 220px;
            border-radius: 10px;
            overflow: hidden;
        }

        .past-event-flyer img {
            width: 100%;
            height: 150px;
            object-fit: cover;
            display: block;
        }

        .past-event-details {
            flex: 1;
        }

        .past-event-title {
            font-size: 1.3rem;
            color: var(--text);
            margin-bottom: 1rem;
            line-height: 1.2;
        }

        .past-event-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
        }

        .past-event-meta .meta-icon {
            color: var(--accent);
            font-size: 1.4rem;
        }

        .past-event-meta .meta-text h4 {
            font-size: 1rem;
            color: var(--text-light);
            margin-bottom: 0.1rem;
        }

        .past-event-meta .meta-text p {
            font-size: 0.75rem;
            color: var(--text);
            font-weight: 600;
        }

        /* Calendar Section */
        .calendar-section {
            padding: 4rem 0 6rem;
            background: var(--card-bg);
        }

        .calendar-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        /* Live Time Display */
        .live-time {
            background: var(--card-bg);
            padding: 1.5rem 2rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .time-display {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .time-icon {
            font-size: 2.5rem;
            color: var(--secondary);
        }

        .time-text h3 {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }

        .time-text p {
            font-size: 2rem;
            color: var(--secondary);
            font-weight: 700;
        }

        .date-display {
            text-align: right;
        }

        .date-display p {
            font-size: 1.2rem;
            color: var(--text-light);
        }

        .date-display h4 {
            font-size: 1.8rem;
            color: var(--primary);
        }

        /* Calendar Styling */
        .calendar {
            background: var(--card-bg);
            border-radius: 15px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .calendar-header {
            background: var(--light);
            color: var(--primary);
            padding: 1.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .calendar-title {
            font-size: 1.8rem;
            font-weight: 600;
        }

        .calendar-nav {
            display: flex;
            gap: 1rem;
        }

        .nav-btn {
            background: gray;
            border: none;
            color: var(--primary);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: scale(1.1);
        }

        .calendar-weekdays {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            background: var(--secondary);
            color: white;
            padding: 1rem 0;
            text-align: center;
            font-weight: 600;
        }

        .weekday {
            padding: 0.5rem;
        }

        .calendar-days {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 1px;
            background: var(--light);
            padding: 1px;
        }

        .day {
            background: var(--card-bg);
            padding: 1.5rem 0.5rem;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            min-height: 100px;
        }

        .day:hover {
            background: var(--light);
        }

        .day-number {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            display: inline-block;
            width: 30px;
            height: 30px;
            line-height: 30px;
            border-radius: 50%;
        }

        .day.empty {
            background: var(--bg);
            cursor: default;
        }

        .day.empty:hover {
            background: var(--bg);
        }

        .day.today .day-number {
            background: var(--secondary);
            color: white;
        }

        .day.event-day .day-number {
            background: var(--accent);
            color: white;
        }

        .day.has-event::after {
            content: '';
            position: absolute;
            bottom: 10px;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }

        .day.event-day.has-event::after {
            background: white;
        }

        .day:hover .event-tooltip {
            display: block;
        }

        .event-tooltip {
            display: none;
            position: absolute;
            top: -100px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: white;
            padding: 0.8rem 1.2rem;
            border-radius: 8px;
            width: 200px;
            z-index: 100;
            box-shadow: var(--shadow);
            text-align: left;
        }

        .event-tooltip::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            border-width: 10px 10px 0;
            border-style: solid;
            border-color: var(--primary) transparent transparent;
        }

        .event-tooltip h5 {
            font-size: 1rem;
            margin-bottom: 0.5rem;
            color: white;
        }

        .event-tooltip p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 0.3rem;
        }

        .legend {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .legend-color {
            width: 20px;
            height: 20px;
            border-radius: 50%;
        }

        .legend-color.today {
            background: var(--secondary);
        }

        .legend-color.event {
            background: var(--accent);
        }

        .legend-text {
            font-size: 0.9rem;
            color: var(--text-light);
        }

        
        /* Responsive Design */
        @media (max-width: 992px) {
            .activity-container {
                grid-template-columns: 1fr;
                gap: 3rem;
            }
            .activity-flyer img {
                width: 100%;
                height: 600px;
                display: block;
        }
            .page-header-content h1 {
                font-size: 2.8rem;
            }

            .past-event-card {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }

            .past-event-flyer {
                width: 100%;
            }

            .past-event-flyer img {
                height: 220px;
            }

            .past-event-meta {
                justify-content: center;
            }

            .calendar-days .day {
                min-height: 80px;
                padding: 1rem 0.3rem;
            }
            
            .day-number {
                width: 25px;
                height: 25px;
                line-height: 25px;
                font-size: 1rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links, .theme-toggle {
                display: none;
            }
            
            .mobile-menu {
                display: flex;
            }
            
            .page-header-content h1 {
                font-size: 2.2rem;
            }
            .activity-flyer img {
                width: 100%;
                height: 300px;
                display: block;
            }
            .section-title {
                font-size: 1.8rem;
            }
            
            .activity-title {
                font-size: 2rem;
            }
            
            .live-time {
                flex-direction: column;
                text-align: center;
                gap: 1.5rem;
            }
            
            .time-display {
                flex-direction: column;
                gap: 1rem;
            }
            
            .date-display {
                text-align: center;
            }
            
            .calendar-header {
                flex-direction: column;
                gap: 1rem;
                text-align: center;
            }
            
            .calendar-weekdays .weekday {
                font-size: 0.9rem;
                padding: 0.5rem 0.2rem;
            }
            
            .calendar-days .day {
                min-height: 70px;
                padding: 0.8rem 0.2rem;
            }
            
            .event-tooltip {
                width: 150px;
                font-size: 0.8rem;
                top: -80px;
            }
            
        }

        @media (max-width: 576px) {
            .page-header {
                height: 35vh;
            }
            .activity-flyer img {
                width: 100%;
                height: 300px;
                display: block;
        }
            .activity-meta {
                flex-direction: column;
                gap: 1rem;
            }

            .past-event-meta {
                flex-direction: column;
                align-items: center;
                gap: 1rem;
            }

            .calendar-days .day {
                min-height: 60px;
                padding: 0.6rem 0.1rem;
            }
            
            .day-number {
                width: 22px;
                height: 22px;
                line-height: 22px;
                font-size: 0.9rem;
            }
            
            .calendar-title {
                font-size: 1.5rem;
            }
            
            .time-text p {
                font-size: 1.5rem;
            }
            
            .date-display h4 {
                font-size: 1.5rem;
            }
            
            .legend {
                flex-direction: column;
                align-items: center;
                gap: 1rem;
            }
        }

        @media (max-width: 370px) {
            .activity-flyer img {
                width: 100%;
                height: 300px;
                display: block;
        }
        }