:root {
            --green: #4ade6e;
            --green-dark: #22c55e;
            --green-deep: #15803d;
            --teal: #2dd4bf;
            --navy: #0f1f35;
            --navy-mid: #1b3152;
            --navy-light: #243d5f;
            --card-bg: #162640;
            --card-border: rgba(74, 222, 110, 0.12);
            --text-primary: #f0f6ff;
            --text-muted: #7fa3c8;
            --accent: #fbbf24;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'Plus Jakarta Sans', sans-serif;
            background-color: var(--navy);
            background-image:
                radial-gradient(ellipse 80% 60% at 50% -20%, rgba(34, 197, 94, 0.18) 0%, transparent 70%),
                radial-gradient(ellipse 50% 40% at 90% 80%, rgba(45, 212, 191, 0.1) 0%, transparent 60%);
            min-height: 100vh;
            padding: 24px 20px 48px;
            color: var(--text-primary);
        }

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

        /* BACK BUTTON */
        .back-button {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.1);
            backdrop-filter: blur(8px);
            padding: 10px 20px;
            border-radius: 30px;
            cursor: pointer;
            font-family: inherit;
            font-weight: 500;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 32px;
            transition: all 0.25s ease;
            text-decoration: none; /* novo */
        }
        .back-button:hover {
            color: var(--text-primary);
            border-color: var(--green);
            transform: translateX(-3px);
        }

        /* HERO HEADER */
        .download-header {
            text-align: center;
            margin-bottom: 40px;
            padding: 56px 32px 48px;
            background: linear-gradient(160deg, var(--card-bg) 0%, #0d1b2e 100%);
            border: 1px solid var(--card-border);
            border-radius: 28px;
            position: relative;
            overflow: hidden;
        }

        .download-header::before {
            content: '';
            position: absolute;
            top: -60px; left: 50%;
            transform: translateX(-50%);
            width: 300px; height: 200px;
            background: radial-gradient(ellipse, rgba(74,222,110,0.2) 0%, transparent 70%);
            pointer-events: none;
        }

        .header-icon {
            width: 88px; height: 88px;
            background: linear-gradient(135deg, var(--green-dark), var(--teal));
            border-radius: 24px;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 24px;
            box-shadow: 0 0 40px rgba(74, 222, 110, 0.35);
            position: relative;
        }
        .header-icon i { font-size: 42px; color: #fff; }

        .download-header h1 {
            font-size: 38px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            margin-bottom: 10px;
        }

        .download-header h1 span {
            background: linear-gradient(90deg, var(--green), var(--teal));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .download-header p {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 400px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* CARD */
        .card {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 28px;
            margin-bottom: 20px;
            border: 1px solid var(--card-border);
            transition: border-color 0.3s ease, transform 0.3s ease;
        }
        .card:hover {
            border-color: rgba(74, 222, 110, 0.3);
            transform: translateY(-2px);
        }

        /* VERSION ROW */
        .version-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .version-info { display: flex; align-items: center; gap: 14px; }

        .version-badge {
            background: linear-gradient(135deg, var(--green-dark), var(--green-deep));
            color: #fff;
            padding: 6px 18px;
            border-radius: 20px;
            font-family: 'Space Mono', monospace;
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 0.5px;
            box-shadow: 0 0 16px rgba(34,197,94,0.3);
        }

        .version-label {
            font-size: 13px;
            color: var(--text-muted);
        }
        .version-label strong {
            display: block;
            color: var(--text-primary);
            font-size: 15px;
        }

        .btn-android {
            background: linear-gradient(135deg, var(--green-dark) 0%, var(--teal) 100%);
            color: #fff;
            border: none;
            padding: 14px 32px;
            border-radius: 30px;
            font-family: inherit;
            font-weight: 700;
            font-size: 15px;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 24px rgba(34,197,94,0.35);
        }
        .btn-android:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(34,197,94,0.5);
        }

        /* QR CODE */
        .qrcode-card {
            max-width: 400px;
            margin-left: auto;
            margin-right: auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 32px 24px;
            text-align: center;
        }

        #qrcode {
            display: flex;
            justify-content: center;
            margin-bottom: 16px;
        }
        #qrcode img, #qrcode canvas {
            width: 160px !important; height: 160px !important;
            border-radius: 16px;
            padding: 10px;
            background: white;
            box-shadow: 0 0 30px rgba(74,222,110,0.2);
            cursor: pointer;
        }

        .qrcode-card h3 {
            font-size: 16px; font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .qrcode-card p { font-size: 13px; color: var(--text-muted); line-height: 1.5; }



        /* FEATURES */
        .section-title {
            font-size: 26px; font-weight: 800;
            color: var(--text-primary);
            text-align: center;
            margin-bottom: 24px;
            letter-spacing: -0.3px;
        }
        .section-title span {
            background: linear-gradient(90deg, var(--green), var(--teal));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-bottom: 24px;
        }

        @media (max-width: 640px) { .features-grid { grid-template-columns: 1fr; } }

        .feature-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--card-bg);
            border-radius: 20px;
            border: 1px solid var(--card-border);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        .feature-card::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; right: 0;
            height: 3px;
            opacity: 0;
            transition: opacity 0.3s;
        }
        .feature-card:nth-child(1)::after { background: linear-gradient(90deg, var(--green), var(--green-dark)); }
        .feature-card:nth-child(2)::after { background: linear-gradient(90deg, var(--teal), var(--green-dark)); }
        .feature-card:nth-child(3)::after { background: linear-gradient(90deg, var(--accent), var(--green-dark)); }

        .feature-card:hover { transform: translateY(-4px); border-color: rgba(74,222,110,0.3); }
        .feature-card:hover::after { opacity: 1; }

        .feature-icon {
            width: 64px; height: 64px;
            border-radius: 18px;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 18px;
        }
        .feature-card:nth-child(1) .feature-icon { background: rgba(74,222,110,0.15); }
        .feature-card:nth-child(2) .feature-icon { background: rgba(45,212,191,0.15); }
        .feature-card:nth-child(3) .feature-icon { background: rgba(251,191,36,0.15); }

        .feature-icon i { font-size: 28px; }
        .feature-card:nth-child(1) .feature-icon i { color: var(--green); }
        .feature-card:nth-child(2) .feature-icon i { color: var(--teal); }
        .feature-card:nth-child(3) .feature-icon i { color: var(--accent); }

        .feature-card h3 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
        .feature-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

        /* INSTALL STEPS */
        .install-section {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 20px;
            padding: 32px;
            margin-bottom: 20px;
        }

        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            margin-bottom: 28px;
        }

        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 20px;
            padding: 18px 0;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            opacity: 0.45;
            transition: all 0.3s ease;
        }
        .step-item:last-child { border-bottom: none; }
        .step-item.active { opacity: 1; }

        .step-num {
            width: 44px; height: 44px;
            flex-shrink: 0;
            border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            font-family: 'Space Mono', monospace;
            font-size: 16px; font-weight: 700;
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.08);
            color: var(--text-muted);
            transition: all 0.3s ease;
        }
        .step-item.active .step-num {
            background: linear-gradient(135deg, var(--green-dark), var(--teal));
            border-color: transparent;
            color: #fff;
            box-shadow: 0 0 20px rgba(34,197,94,0.4);
        }

        .step-content { padding-top: 4px; }
        .step-content strong { display: block; font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
        .step-content span { font-size: 13px; color: var(--text-muted); }

        .step-button {
            display: block;
            margin: 0 auto;
            background: linear-gradient(135deg, var(--green-dark), var(--teal));
            border: none;
            color: #fff;
            padding: 12px 36px;
            border-radius: 30px;
            font-family: inherit;
            font-weight: 700;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 20px rgba(34,197,94,0.3);
        }
        .step-button:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(34,197,94,0.45); }

        /* INFO ALERT */
        .info-alert {
            background: rgba(59, 130, 246, 0.1);
            border: 1px solid rgba(59, 130, 246, 0.2);
            border-radius: 16px;
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .info-alert i { font-size: 20px; color: #60a5fa; flex-shrink: 0; }
        .info-alert p { font-size: 13px; color: #93c5fd; line-height: 1.5; }

        /* TOAST */
        .toast {
            position: fixed;
            bottom: 30px; left: 50%;
            transform: translateX(-50%);
            background: var(--navy-light);
            border: 1px solid var(--green-dark);
            color: var(--green);
            padding: 12px 24px;
            border-radius: 30px;
            font-size: 14px; font-weight: 600;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0,0,0,0.4);
            animation: fadeInUp 0.3s ease;
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateX(-50%) translateY(16px); }
            to   { opacity: 1; transform: translateX(-50%) translateY(0); }
        }

        /* MOBILE */
        @media (max-width: 768px) {
            .download-header h1 { font-size: 28px; }
            .version-row { flex-direction: column; }
            .btn-android { width: 100%; justify-content: center; }
        }