:root {
            /* Dark Mode */
            --bg-primary: #050a08;
            --bg-secondary: #0a1f1a;
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.8);
            --text-tertiary: rgba(255, 255, 255, 0.4);
            --accent-color: #4ade80;
            --accent-border: rgba(74, 222, 128, 0.1);
            --accent-border-light: rgba(74, 222, 128, 0.2);
            --card-bg: rgba(10, 31, 26, 0.6);
            --ad-bg: rgba(10, 25, 20, 0.85);
            --nav-bg: rgba(10, 25, 20, 0.9);
            --nav-item-inactive: rgba(255, 255, 255, 0.35);
            --close-icon: rgba(255, 255, 255, 0.4);
            --download-btn-bg: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
            --download-btn-color: #050a08;
            --feedback-btn-color: #4ade80;
            --feedback-btn-hover-bg: #4ade80;
            --feedback-btn-hover-color: #050a08;
        }

        [data-theme="light"] {
            /* Light Mode */
            --bg-primary: #ffffff;
            --bg-secondary: #ffffff;
            --text-primary: #111824;
            --text-secondary: #374151;
            --text-tertiary: #6b7280;
            --accent-color: #10b981;
            --accent-border: #d1fae5;
            --accent-border-light: #a7f3d0;
            --card-bg: #f8fafc;
            --ad-bg: #f9fafb;
            --nav-bg: #ffffff;
            --nav-item-inactive: #6b7280;
            --close-icon: #6b7280;
            --download-btn-bg: linear-gradient(135deg, #10b981 0%, #059669 100%);
            --download-btn-color: #ffffff;
            --feedback-btn-color: #10b981;
            --feedback-btn-hover-bg: #10b981;
            --feedback-btn-hover-color: #ffffff;
        }

        html, body {
            height: 100%;
            margin: 0;
            background-color: var(--bg-primary);
            font-family: 'Work Sans', sans-serif;
            color: var(--text-primary);
            overflow-x: hidden;
            transition: background-color 0.3s, color 0.3s;
        }

        .jumbotron-single {
            background: radial-gradient(circle at center, var(--bg-secondary) 0%, var(--bg-primary) 100%);
            min-height: 100vh;
            margin-bottom: 0 !important;
            padding-top: 50px;
            padding-bottom: 180px !important;
            display: flex;
            align-items: center;
            position: relative;
        }

        .jumbotron-single::before,
        .jumbotron-single::after {
            display: none !important;
        }

        [data-theme="light"] .jumbotron-single {
            background: #ffffff !important;
        }

        .calendar-card {
            background: var(--card-bg);
            border: 1px solid var(--accent-border);
            border-radius: 30px;
            padding: 50px 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            max-width: 550px;
            margin: 0 auto;
        }

        [data-theme="dark"] .calendar-card {
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 15px 45px rgba(0, 0, 0, 0.4);
        }

        .calendar-icon {
            font-size: 50px;
            color: var(--accent-color);
            margin-bottom: 25px;
            text-shadow: 0 0 20px rgba(74, 222, 128, 0.3);
        }

        .section-title {
            color: var(--text-primary);
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .description-text {
            font-size: 15px;
            line-height: 1.7;
            color: var(--text-secondary);
            margin-bottom: 35px;
        }

        .btn-download {
            background: var(--download-btn-bg);
            color: var(--download-btn-color) !important;
            font-weight: 700;
            border: none;
            border-radius: 50px;
            padding: 16px 40px;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px rgba(34, 197, 94, 0.2);
            display: inline-flex;
            align-items: center;
            text-decoration: none !important;
        }

        /* --- BOTTOM AD BANNER --- */
        .bottom-ad-banner {
            position: fixed;
            bottom: 95px; left: 0; right: 0;
            margin-left: auto; margin-right: auto;
            width: 90%; max-width: 400px;
            background: var(--ad-bg);
            border: 1px solid var(--accent-border-light);
            border-radius: 15px;
            padding: 10px 15px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            z-index: 999;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .ad-content-wrapper {
            display: flex; align-items: center; text-decoration: none !important;
            flex-grow: 1; justify-content: center;
        }
        .bottom-ad-banner img { height: 35px; border-radius: 4px; margin-right: 12px; }
        .bottom-ad-banner span { font-size: 11px; color: var(--accent-color); font-weight: 600; }
        .close-ad-icon { color: var(--close-icon); font-size: 16px; cursor: pointer; padding-left: 10px; }

        /* --- NAVIGATION --- */
        .bottom-nav {
            position: fixed;
            bottom: 25px; left: 50%;
            transform: translateX(-50%);
            width: 90%; max-width: 400px;
            background: var(--nav-bg);
            display: flex; justify-content: space-around;
            padding: 12px 5px; border-radius: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            z-index: 1000; border: 1px solid var(--accent-border);
        }

        .nav-item {
            display: flex; flex-direction: column; align-items: center;
            text-decoration: none !important; color: var(--nav-item-inactive);
            transition: 0.3s; flex: 1;
        }

        .nav-item i { font-size: 18px; margin-bottom: 4px; }
        .nav-item span { font-size: 8px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; }
        .nav-item.active { color: var(--accent-color); }
        .nav-item.active i { text-shadow: 0 0 10px rgba(74, 222, 128, 0.4); }

        /* --- THEME TOGGLE --- */
        .theme-toggle {
            position: fixed; top: 15px; right: 15px; z-index: 1001;
            background: var(--nav-bg); border: 1px solid var(--accent-border);
            border-radius: 50%; width: 36px; height: 36px;
            display: flex; align-items: center; justify-content: center;
            cursor: pointer; box-shadow: 0 2px 6px rgba(0,0,0,0.1);
            transition: all 0.25s ease;
        }
        .theme-toggle i { font-size: 16px; color: var(--accent-color); }