:root {
            --bg-primary: #050a08;
            --bg-secondary: #0a1f1a;
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.7);
            --text-tertiary: rgba(255, 255, 255, 0.4);
            --accent-color: #4ade80;
            --accent-bg: rgba(74, 222, 128, 0.05);
            --accent-border: rgba(74, 222, 128, 0.3);
            --hr-color: rgba(74, 222, 128, 0.1);
            --card-bg: rgba(10, 25, 20, 0.98);
            --nav-bg: rgba(10, 25, 20, 0.9);
            --ad-bg: rgba(10, 25, 20, 0.85);
            --nav-item-inactive: rgba(255, 255, 255, 0.35);
            --close-icon: rgba(255, 255, 255, 0.4);
        }

        [data-theme="light"] {
            --bg-primary: #ffffff;
            --bg-secondary: #ffffff;
            --text-primary: #111824;
            --text-secondary: #374151;
            --text-tertiary: #6b7280;
            --accent-color: #10b981;
            --accent-bg: #ecfdf5;
            --accent-border: #a7f3d0;
            --hr-color: #e5e7eb;
            --card-bg: #ffffff;
            --nav-bg: #ffffff;
            --ad-bg: #fafafa;
            --nav-item-inactive: #6b7280;
            --close-icon: #6b7280;
        }

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

        *, *:before, *:after {
            box-sizing: inherit;
        }

        .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: 60px;
            padding-bottom: 180px !important;
            display: flex;
            align-items: center;
            justify-content: flex-start;
            flex-direction: column;
            position: relative;
        }

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

        .header-section {
            text-align: center;
            margin-bottom: 30px;
        }

        .section-title {
            color: var(--accent-color);
            font-size: 13px;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            font-weight: 700;
            margin-bottom: 10px;
            display: block;
        }

        .calc-container {
            width: 90%;
            max-width: 450px;
            z-index: 2;
        }

        .calc-card {
            background: var(--card-bg);
            border: 1px solid var(--accent-border);
            border-radius: 24px;
            padding: 25px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .input-group-custom {
            margin-bottom: 18px;
        }

        .input-label {
            display: block;
            font-size: 11px;
            color: var(--accent-color);
            margin-bottom: 6px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1px;
            opacity: 0.8;
        }

        .input-row {
            display: flex;
            gap: 10px;
        }

        .input-wrapper {
            position: relative;
            display: flex;
            align-items: center;
            flex: 1;
        }

        .currency-select {
            background: var(--card-bg);
            color: var(--text-primary);
            border: 1px solid var(--accent-border);
            border-radius: 12px;
            padding: 10px 15px;
            margin-bottom: 20px;
            width: 100%;
            font-family: 'Work Sans', sans-serif;
            font-size: 12px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .currency-select:focus {
            border-color: var(--accent-color);
            outline: none;
        }

        .currency-symbol {
            position: absolute;
            left: 12px;
            color: var(--accent-color);
            font-weight: 700;
            font-size: 11px;
            pointer-events: none;
        }

        .unit-symbol {
            position: absolute;
            right: 12px;
            color: var(--text-primary);
            font-weight: 400;
            font-size: 11px;
            opacity: 0.5;
            pointer-events: none;
        }

        .calc-input {
            width: 100%;
            background: var(--accent-bg);
            border: 1px solid var(--accent-border);
            border-radius: 12px;
            padding: 10px 12px;
            color: var(--text-primary);
            font-size: 15px;
            outline: none;
            transition: all 0.2s;
        }

        .calc-input.has-currency {
            padding-left: 45px;
        }

        .calc-input.has-unit {
            padding-right: 35px;
        }

        .calc-input:focus {
            border-color: var(--accent-color);
            background: var(--accent-bg);
        }

        .result-box {
            margin-top: 25px;
            padding: 20px;
            background: var(--accent-bg);
            border: 1px solid var(--accent-border);
            border-radius: 18px;
            text-align: center;
        }

        .result-label {
            font-size: 10px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-primary);
            opacity: 0.6;
            margin-bottom: 4px;
        }

        .result-value {
            font-size: 26px;
            font-weight: 700;
            color: var(--accent-color);
        }

        .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);
            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: 20px;
            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;
            transition: 0.3s;
        }
        .close-ad-icon:hover { color: #ff4d4d; }

        .bottom-nav {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: 90%;
            max-width: 400px;
            background: var(--nav-bg);
            backdrop-filter: blur(10px);
            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 {
            position: fixed; top: 15px; right: 15px; z-index: 1001;
            background: var(--card-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); }

        .disclaimer {
            font-size: 10px;
            color: var(--text-tertiary);
            margin-top: 20px;
            font-style: italic;
            text-align: center;
        }
.nav-icon, img, a {
    -webkit-user-drag: none;  /* Specifically prevents dragging the element */
    user-drag: none;
    -webkit-tap-highlight-color: transparent; /* Removes the blue box when clicking */
}