:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --secondary: #1e40af;
            --accent: #3b82f6;
            --light: #f8fafc;
            --dark: #0f172a;
            --gray: #64748b;
            --light-gray: #e2e8f0;
            --white: #ffffff;
            --success: #10b981;
            --glass: rgba(255,255,255,0.75);
            --shadow: rgba(15,23,42,0.14);
            --muted: #475569;
        }

:root[data-theme="dark"] {
            --primary: #60a5fa;
            --primary-dark: #3b82f6;
            --primary-light: rgba(96,165,250,0.18);
            --secondary: #1e3a8a;
            --accent: #38bdf8;
            --light: #020617;
            --dark: #e2e8f0;
            --gray: #94a3b8;
            --light-gray: #1f2937;
            --white: #0f172a;
            --success: #34d399;
            --glass: rgba(15,23,42,0.7);
            --shadow: rgba(0,0,0,0.45);
            --muted: #cbd5f5;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Header */
        header {
            background-color: var(--white);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        
        .logo-icon {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            width: 40px;
            height: 40px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 18px;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark);
        }
        
        .logo-text span {
            color: var(--primary);
        }
        
        .nav-links {
            display: flex;
            gap: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
        }
        
        .btn {
            display: inline-block;
            padding: 10px 24px;
            border-radius: 6px;
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            border: 2px solid transparent;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }
        
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        
        .btn-outline:hover {
            background: var(--primary-light);
        }
        
        /* Hero Section */
        .hero {
            padding: 80px 0;
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            text-align: center;
        }
        
        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .hero h1 span {
            color: var(--primary);
        }
        
        .hero p {
            font-size: 1.25rem;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto 40px;
        }
        
        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        
        /* Features Section */
        .features {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        
        .feature-card {
            background: var(--white);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            width: 60px;
            height: 60px;
            background: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--primary);
            font-size: 24px;
        }
        
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        
        .feature-card p {
            color: var(--gray);
        }
        
        /* Download Section */
        .download-section {
            padding: 80px 0;
            background: var(--primary);
            color: white;
            text-align: center;
        }
        
        .download-section .container {
            max-width: 800px;
        }
        
        .download-section h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .download-section p {
            margin-bottom: 30px;
            font-size: 1.2rem;
            opacity: 0.9;
        }
        
        .download-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .download-btn {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 15px 30px;
            background: white;
            color: var(--primary);
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: transform 0.3s;
        }
        
        .download-btn:hover {
            transform: translateY(-3px);
        }
        
        /* Support Page */
        .support-page {
            padding: 60px 0;
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background: white;
            border-radius: 12px;
            margin-bottom: 20px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
        }
        
        .faq-question {
            padding: 20px 25px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.1rem;
        }
        
        .faq-question i {
            transition: transform 0.3s;
        }
        
        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
        }
        
        .faq-item.active .faq-answer {
            padding: 0 25px 25px;
            max-height: 500px;
        }
        
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        
        /* Download Page */
        .download-page {
            padding: 60px 0;
        }
        
        .download-info {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 50px;
        }
        
        .download-info h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .download-info p {
            font-size: 1.2rem;
            color: var(--gray);
            margin-bottom: 30px;
        }
        
        .system-requirements {
            background: white;
            border-radius: 16px;
            padding: 30px;
            margin: 40px 0;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
        }
        
        .system-requirements h3 {
            margin-bottom: 20px;
            color: var(--primary);
        }
        
        .requirements-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }
        
        .requirement-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }
        
        .requirement-icon {
            color: var(--success);
            margin-top: 4px;
        }
        
        /* Footer */
        footer {
            background: var(--dark);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-col h3 {
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .nav-links {
                display: none;
            }
            
            .download-buttons {
                flex-direction: column;
                align-items: center;
            }
        }

        .nav-actions{display:flex;align-items:center}

        .theme-toggle{
        display:inline-grid;
        place-items:center;
        width:42px;height:42px;border-radius:10px;border:0;background:var(--glass);cursor:pointer;padding:6px;
        transition: transform .18s ease, background .25s ease;
        box-shadow: 0 4px 18px var(--shadow);
        }
        .theme-toggle:active{transform:scale(.98)}
        .theme-toggle .icon{width:20px;height:20px;fill:var(--muted)}
        [data-theme="dark"] .theme-toggle .icon{fill:var(--muted)}

        /* Dark theme structural overrides */
        :root[data-theme="dark"] body {
            background-color: #020617;
            color: #e2e8f0;
        }

        :root[data-theme="dark"] .hero {
            background: linear-gradient(160deg, #0b1120 0%, #111827 50%, #0f172a 100%);
        }

        :root[data-theme="dark"] .hero p {
            color: #cbd5f5;
        }

        :root[data-theme="dark"] .feature-card {
            background: rgba(15, 23, 42, 0.9);
            box-shadow: 0 20px 45px rgba(2, 6, 23, 0.5);
            color: #e2e8f0;
        }

        :root[data-theme="dark"] .feature-card p {
            color: #94a3b8;
        }

        :root[data-theme="dark"] .feature-icon {
            background: rgba(96, 165, 250, 0.2);
            color: #bfdbfe;
        }

        :root[data-theme="dark"] .download-section {
            background: linear-gradient(180deg, #0b1120 0%, #0f172a 100%);
            color: #e0f2fe;
        }

        :root[data-theme="dark"] .download-section p {
            color: rgba(226, 232, 240, 0.9);
        }

        :root[data-theme="dark"] .download-btn {
            background: rgba(15, 23, 42, 0.85);
            color: #e0f2fe;
        }

        :root[data-theme="dark"] .download-btn:hover {
            box-shadow: 0 12px 30px rgba(2, 6, 23, 0.55);
        }

        :root[data-theme="dark"] .section-title h2,
        :root[data-theme="dark"] .section-title p {
            color: #e2e8f0;
        }

        :root[data-theme="dark"] .faq-question {
            color: #e2e8f0;
        }

        :root[data-theme="dark"] .faq-answer p {
            color: #cbd5f5;
        }

        :root[data-theme="dark"] footer {
            background: #020617;
            color: #e2e8f0;
        }

        :root[data-theme="dark"] .footer-links a {
            color: #94a3b8;
        }

        :root[data-theme="dark"] .footer-links a:hover {
            color: #f8fafc;
        }