:root {
            --bg: #0a0b0c;
            --bg-2: #0f1113;
            --text: rgba(255, 255, 255, 0.92);
            /* unified translucent haze white */
            --muted: rgba(255, 255, 255, 0.72);
            /* softer haze white for secondary text */
            --accent: #7ee2c3;
            /* mint */
            --accent-2: #52c6a7;
            --card: rgba(255, 255, 255, 0.06);
            --card-2: rgba(255, 255, 255, 0.08);
            --ring: rgba(126, 226, 195, 0.32);
            --glass-border: rgba(255, 255, 255, 0.10);
            --glass-top: rgba(255, 255, 255, 0.10);
            --glass-bottom: rgba(0, 0, 0, 0.35);
            /* Sunset accent palette */
            --sun-1: 255, 122, 89;
            /* red‑orange */
            --sun-2: 255, 184, 102;
            /* orange */
            --sun-3: 255, 224, 163;
            /* light orange */
            --surface-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
            --surface-inset-shadow:
                inset 0 1px 0 var(--glass-top),
                inset 0 -1px 0 var(--glass-bottom);
            --card-shadow:
                0 20px 60px rgba(0, 0, 0, 0.45),
                var(--surface-inset-shadow);
            --panel-shadow:
                0 14px 36px rgba(0, 0, 0, 0.35),
                var(--surface-inset-shadow);
            --feature-bg: rgba(255, 255, 255, 0.06);
            --feature-border: rgba(255, 255, 255, 0.10);
            --chip-bg: rgba(255, 255, 255, 0.05);
            --chip-border: rgba(255, 255, 255, 0.16);
            --chip-hover-bg: rgba(126, 226, 195, 0.12);
            --chip-hover-border: rgba(126, 226, 195, 0.6);
            --tpc-hero-max: 44px;
            /* cap main title on smaller screens */
        }

        * {
            box-sizing: border-box;
        }

        html,
        body {
            height: 100%;
        }

        body {
            margin: 0;
            font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, Arial, sans-serif;
            color: var(--text);
            background:
                radial-gradient(1200px 600px at 50% 110%, rgba(var(--sun-1), 0.08), transparent 60%),
                radial-gradient(900px 500px at 10% -20%, rgba(var(--sun-2), 0.06), transparent 60%),
                linear-gradient(180deg, var(--bg), var(--bg-2));
            display: grid;
            place-items: center;
            padding: 32px;
            min-height: 100svh;
            overflow-y: auto;
            overflow-x: hidden;
        }

        /* Full‑page background video */
        .bg-video {
            position: fixed;
            inset: 0;
            z-index: 0;
            /* behind page content */
            overflow: hidden;
            pointer-events: none;
            /* clicks pass through */
        }

        .bg-video video {
            width: 100%;
            height: 100%;
            object-fit: cover;
            /* fill screen, crop if needed */
            object-position: center;
            filter: saturate(1.05) contrast(1.05) brightness(0.6);
            transform: translateZ(0);
            /* better GPU compositing */
        }

        /* soft gradient overlay for readability */
        .bg-video::after {
            content: "";
            position: absolute;
            inset: 0;
            background:
                radial-gradient(1200px 600px at 50% 110%, rgba(var(--sun-1), 0.10), transparent 60%),
                radial-gradient(900px 500px at 10% -20%, rgba(var(--sun-2), 0.08), transparent 60%),
                linear-gradient(180deg, rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0.55));
            mix-blend-mode: normal;
        }

        /* make sure content sits above */
        .shell,
        .sections,
        .page-band,
        .card {
            position: relative;
            z-index: 1;
        }

        /* Respect users who prefer less motion or limited data */
        @media (prefers-reduced-motion: reduce) {
            .bg-video {
                display: none;
            }
        }

        /* Ambient smoke/particle vibe to match Squish Tracker feel */
        .smoke {
            position: fixed;
            inset: -20% -20% -20% -20%;
            pointer-events: none;
            background:
                radial-gradient(60% 30% at 50% 120%, rgba(126, 226, 195, 0.08), transparent 60%),
                radial-gradient(40% 25% at 20% -10%, rgba(126, 226, 195, 0.06), transparent 60%),
                url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="240" height="240" viewBox="0 0 240 240"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.85" numOctaves="2" stitchTiles="stitch"/></filter><rect width="240" height="240" filter="url(%23n)" opacity="0.04"/></svg>');
            mix-blend-mode: screen;
            animation: drift 24s ease-in-out infinite alternate;
        }

        /* --- Disable animations (requested) --- */
        .smoke {
            animation: none !important;
        }

        @keyframes drift {
            0% {
                transform: translate3d(0, 10px, 0) scale(1.02);
                filter: blur(0.6px);
            }

            100% {
                transform: translate3d(0, -10px, 0) scale(1.04);
                filter: blur(1px);
            }
        }

        .shell {
            width: 100%;
            max-width: 1200px;
            position: relative;
            z-index: 1;
        }

        .card {
            position: relative;
            border-radius: 24px;
            padding: 28px 28px 20px;
            background: var(--surface-bg);
            border: 1px solid var(--glass-border);
            box-shadow: var(--card-shadow);
            backdrop-filter: blur(14px);
        }

        /* Subtle accent border glow like the Squish Tracker “liquid glass” */
        .card::after {
            content: "";
            position: absolute;
            inset: -1px;
            border-radius: 24px;
            pointer-events: none;
            background: linear-gradient(135deg, rgba(var(--sun-1), 0.35), rgba(var(--sun-2), 0.10) 30%, transparent 60%);
            mask: radial-gradient(120% 120% at -10% -10%, #000 35%, transparent 45%) top left / 100% 100% no-repeat;
        }

        /* Fill the page with additional sections */
        .sections {
            margin-top: 28px;
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 18px;
        }

        .panel {
            border-radius: 20px;
            padding: 18px;
            background: var(--surface-bg);
            border: 1px solid var(--glass-border);
            box-shadow: var(--panel-shadow);
            backdrop-filter: blur(12px);
        }

        .panel h2 {
            margin: 0 0 8px;
            font-size: clamp(18px, 2vw, 24px);
        }

        .panel p {
            margin: 8px 0 12px;
            color: var(--muted);
        }

        .features {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
            margin-top: 10px;
        }

        .feature {
            border-radius: 14px;
            padding: 14px;
            background: var(--feature-bg);
            border: 1px solid var(--feature-border);
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            gap: 8px;
            overflow: hidden;
        }

        .feature a {
            overflow-wrap: anywhere;
            word-break: break-word;
        }

        .feature strong {
            font-size: 16px;
        }

        .feature span {
            color: var(--muted);
            font-size: 14px;
        }

        /* Video/preview panel */
        .media {
            display: inline-block;
            width: 100%;
            border-radius: 14px;
            overflow: hidden;
            background: none;
        }

        .media a.thumb {
            display: block;
            width: 100%;
            height: auto;
            text-decoration: none;
            color: var(--text);
        }

        .media a.thumb img {
            display: block;
            width: 100%;
            height: auto;
            border-radius: 14px;
        }

        .thumb-fallback {
            color: var(--muted);
            font-size: 14px;
            padding: 16px;
            text-align: center;
        }

        /* Full-width soft band at page bottom to remove empty feel */
        .page-band {
            margin-top: 26px;
            border-radius: 20px;
            padding: 18px;
            background:
                radial-gradient(120% 140% at 50% 140%, rgba(126, 226, 195, 0.10), transparent 60%),
                linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
            border: 1px solid var(--glass-border);
            box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
            backdrop-filter: blur(10px);
            text-align: center;
            color: var(--muted);
        }

        .section-links {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .quick-links {
            margin: 12px 0 4px;
        }

        .section-links a {
            text-decoration: none;
            color: var(--text);
            font-size: 0.9rem;
            padding: 7px 10px;
            border-radius: 999px;
            border: 1px solid var(--chip-border);
            background: var(--chip-bg);
            transition: border-color .18s ease, background .18s ease;
        }

        .section-links a:hover,
        .section-links a:focus-visible {
            border-color: var(--chip-hover-border);
            background: var(--chip-hover-bg);
            outline: none;
        }

        .collab-table-wrap {
            margin-top: 10px;
            overflow-x: auto;
        }

        .collab-table {
            width: 100%;
            min-width: 430px;
            border-collapse: collapse;
        }

        .collab-table th,
        .collab-table td {
            text-align: left;
            padding: 9px 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--muted);
            font-size: 14px;
        }

        .collab-table th {
            color: var(--text);
            font-size: 13px;
            letter-spacing: 0.2px;
        }

        .collab-table tr:last-child td {
            border-bottom: 0;
        }

        .legal-sections {
            margin-top: 18px;
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 18px;
        }

        .legal-panel h2 {
            margin-bottom: 4px;
        }

        .legal-panel {
            padding: 0;
            overflow: hidden;
        }

        .accordion-summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            cursor: pointer;
            padding: 16px 18px 14px;
            user-select: none;
        }

        .accordion-summary::-webkit-details-marker {
            display: none;
        }

        .accordion-summary h2 {
            margin: 0;
        }

        .accordion-summary .legal-updated {
            margin: 2px 0 0;
        }

        .accordion-summary .chev {
            color: var(--muted);
            font-size: 14px;
            transition: transform .18s ease;
            transform-origin: center;
            flex: none;
        }

        details[open] .accordion-summary .chev {
            transform: rotate(90deg);
        }

        .accordion-body {
            padding: 0 18px 16px;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
        }

        .collab-checklist-updated{
            display: block;
            margin-bottom: 8px;
            color: var(--muted);
            font-size: 12px;
        }

        .legal-updated {
            display: block;
            margin-bottom: 8px;
            color: var(--muted);
            font-size: 12px;
        }

        .legal-list {
            margin: 12px 0 0;
            padding-left: 18px;
        }

        .legal-list li {
            margin: 8px 0;
            color: var(--muted);
            font-size: 14px;
        }

        .legal-list li strong {
            color: var(--text);
        }

        .foot-links {
            justify-content: center;
            margin-bottom: 10px;
        }

        /* Respect user dark preference (kept same palette) */
        @media (prefers-color-scheme: light) {
            :root {
                --bg: #f7fbfa;
                --bg-2: #eef5f4;
                --text: #ccd6df;
                --muted: #b6cadb;
                --card: rgba(0, 0, 0, 0.04);
                --glass-border: rgba(0, 0, 0, 0.08);
                --ring: rgba(82, 198, 167, 0.28);
            }

            body {
                background:
                    radial-gradient(1200px 600px at 50% 110%, rgba(var(--sun-2), 0.12), transparent 60%),
                    radial-gradient(900px 500px at 10% -20%, rgba(var(--sun-3), 0.10), transparent 60%),
                    linear-gradient(180deg, var(--bg), var(--bg-2));
            }
        }

        .brand {
            display: flex;
            align-items: flex-start;
            /* align tops */
            gap: 12px;
            position: relative;
            padding-bottom: 20px;
            /* room for underline */
        }

        .brand svg,
        .brand .logo {
            width: 48px;
            height: 48px;
            object-fit: contain;
        }

        /* Wordmark */
        .brand h1 {
            font-family: "Plus Jakarta Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, Arial, sans-serif;
            font-weight: 800;
            letter-spacing: 0.2px;
            line-height: 1.15;
            margin: 0;
            color: var(--text);
            /* solid ink for max contrast */
            -webkit-text-stroke: 1px rgba(255, 255, 255, .45);
            /* light outline for dark text (light theme) */
            text-shadow: 0 1px 0 rgba(0, 0, 0, .08);
            /* slight ink lift for readability */
            -webkit-background-clip: initial;
            background-clip: initial;
            background: none;
            position: relative;
        }
        @media (prefers-color-scheme: dark) {
            .brand h1 {
                color: var(--text);
                background: none;
                -webkit-text-stroke: 1px rgba(0, 0, 0, .45);
                /* dark outline for light text (dark theme) */
                text-shadow: 0 1px 0 rgba(0, 0, 0, .2);
            }
        }
        .brand h1::after {
            content: "";
            position: absolute;
            left: 0;
            /* start under the text itself */
            right: 0;
            bottom: -10px;
            /* 10px below the bottom of the text */
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, rgba(var(--sun-1), 0.45), rgba(var(--sun-3), 0.12));
            opacity: .35;
        }

        /* --- Buttons + grid (restored colorful styles) --- */
        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 14px;
            margin-top: 10px;
        }

        .btn {
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 18px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.10);
            text-decoration: none;
            color: var(--text);
            font-weight: 600;
            font-size: 1.25rem;
            /* bigger, as requested earlier */
            transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
            will-change: transform, box-shadow;
        }

        .btn:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(126, 226, 195, 0.45);
            transform: translateY(-1px);
            box-shadow: 0 10px 26px rgba(0, 0, 0, 0.35);
        }

        .btn:focus-visible {
            outline: none;
            box-shadow: 0 0 0 6px var(--ring);
        }

        .btn .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 30%, #aef3de, #5acfb0);
            box-shadow: 0 0 10px rgba(126, 226, 195, 0.75);
            position: relative;
            z-index: 2;
            flex: none;
        }

        .btn .label {
            position: relative;
            z-index: 2;
        }

        .btn.accent,
        .btn.accent:hover,
        .btn.insta,
        .btn.insta:hover,
        .btn._x,
        .btn._x:hover,
        .btn.squish,
        .btn.squish:hover,
        .btn.contact,
        .btn.contact:hover {
            color: #fff;
        }

        .btn.accent,
        .btn.accent:hover {
            text-shadow:
                -1px -1px 0 #ff0000,
                1px -1px 0 #ff0000,
                -1px 1px 0 #ff0000,
                1px 1px 0 #ff0000;
        }

        .btn.insta,
        .btn.insta:hover {
            text-shadow:
                -1px -1px 0 #feda75,
                1px -1px 0 #fa7e1e,
                -1px 1px 0 #d62976,
                1px 1px 0 #962fbf;
        }

        .btn._x,
        .btn._x:hover {
            text-shadow:
                -1px -1px 0 #000000,
                1px -1px 0 #FFFFFF,
                -1px 1px 0 #000000,
                1px 1px 0 #FFFFFF;
        }

        .btn.squish,
        .btn.squish:hover {
            text-shadow:
                -1px -1px 0 #000,
                1px -1px 0 #000,
                -1px 1px 0 #000,
                1px 1px 0 #000;
        }

        .btn.contact,
        .btn.contact:hover {
            text-shadow:
                -1px -1px 0 #228B22,
                1px -1px 0 #228B22,
                -1px 1px 0 #228B22,
                1px 1px 0 #228B22;
        }

        /* YouTube: soft glossy red with white text + red outline */
        .btn.accent {
            background: rgba(255, 0, 0, 0.08);
            border-color: rgba(255, 0, 0, 0.3);
        }

        .btn.accent:hover {
            background: rgba(255, 0, 0, 0.12);
            border-color: rgba(255, 0, 0, 0.5);
        }

        .btn.accent .dot {
            background: radial-gradient(circle at 30% 30%, #ff9a9a, #ff0000);
            box-shadow: 0 0 10px rgba(255, 0, 0, 0.75);
        }

        .btn.insta {
            background: rgba(117, 9, 212, 0.08);
            border-color: rgba(88, 20, 184, 0.3);
        }

        .btn.insta:hover {
            background: rgba(117, 9, 212, 0.12);   /* translucent purple overlay */
            border-color: rgba(88, 20, 184, 0.5); 
        }

        .btn.insta .dot {
            background: radial-gradient(circle at 30% 30%, #ff9a9a, #962fbf);
            box-shadow: 0 0 10px rgba(255, 0, 0, 0.75);
        }

        .btn._x {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(0, 0, 0, 0.3);
        }

        .btn._x:hover {
            background: rgba(255, 255, 255, 0.12);   /* translucent X/Twitter blue overlay */
            border-color: rgba(0, 0, 0, 0.5);  /* slightly stronger translucent border */
        }

        .btn._x .dot {
            background: radial-gradient(circle at 30% 30%, #000000, #000000);
            box-shadow: 0 0 10px rgba(254, 251, 251, 0.75);
        }

        /* Squish: image background with white text + black outline */
.btn.squish {
    background-image: url('/opensquishtrackerbuttonimage.jpeg');
    background-size: cover;
    background-position: center;
    border-color: rgba(0, 0, 0, 0.45);
}

        .btn.squish:hover {
            border-color: rgba(0, 0, 0, 0.6);
        }

        .btn.squish .dot {
            background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.95), rgba(0, 0, 0, 0.35));
            box-shadow: 0 0 10px rgba(255, 255, 255, 0.7);
        }

        /* Contact: light green glossy with white text + dark green outline */
        .btn.contact {
            background: rgba(144, 238, 144, 0.15);
            border-color: rgba(144, 238, 144, 0.4);
        }

        .btn.contact:hover {
            background: rgba(144, 238, 144, 0.22);
            border-color: rgba(144, 238, 144, 0.6);
        }

        .btn.contact .dot {
            background: radial-gradient(circle at 30% 30%, #ccffcc, #32cd32);
            box-shadow: 0 0 10px rgba(50, 205, 50, 0.75);
        }

        /* --- Background video toggle (top‑right control) --- */
        .card-tools {
            position: absolute;
            top: 14px;
            right: 14px;
            z-index: 3;
        }

        @media (max-width: 900px) {
            .sections {
                grid-template-columns: 1fr;
            }

            .features {
                grid-template-columns: 1fr 1fr;
            }

            .legal-sections {
                grid-template-columns: 1fr;
            }

            /* Match legal accordion alignment on small screens */
            #collab-checklist {
                padding: 0;
                overflow: hidden;
            }
        }

        /* On small screens, dock the toggle above the title, right-aligned */
        @media (max-width: 640px) {
            .card-tools {
                position: static;
                /* no absolute overlap */
                display: flex;
                justify-content: flex-end;
                /* right edge */
                margin-bottom: 8px;
                /* space before the brand row */
            }

            .btn.sm {
                /* slightly smaller at this size */
                font-size: 0.88em;
                padding: 0.45em 0.7em;
            }
        }

        .btn.sm {
            font-size: 0.8em;
            /* smaller than other buttons */
            padding: 0.4em 0.65em;
            /* compact padding */
            border-radius: 12px;
        }

        /* Play state (red) */
        #bgToggle[data-playing="true"] {
            background: rgba(220, 53, 69, 0.15);
            border-color: rgba(220, 53, 69, 0.45);
            color: #fff;
            text-shadow:
                -1px -1px 0 #800,
                1px -1px 0 #800,
                -1px 1px 0 #800,
                1px 1px 0 #800;
        }

        #bgToggle[data-playing="true"] .dot {
            background: radial-gradient(circle at 30% 30%, #f99, #c00);
            box-shadow: 0 0 10px rgba(220, 53, 69, 0.7);
        }

        /* Paused state (blue) */
        #bgToggle[data-playing="false"] {
            background: rgba(0, 123, 255, 0.15);
            border-color: rgba(0, 123, 255, 0.45);
            color: #fff;
            text-shadow:
                -1px -1px 0 #004080,
                1px -1px 0 #004080,
                -1px 1px 0 #004080,
                1px 1px 0 #004080;
        }

        #bgToggle[data-playing="false"] .dot {
            background: radial-gradient(circle at 30% 30%, #9cf, #06f);
            box-shadow: 0 0 10px rgba(0, 123, 255, 0.7);
        }

        @media (max-width: 520px) {
            .features {
                grid-template-columns: 1fr;
            }

            .btn.sm {
                padding: 0.5em 0.75em;
            }
        }

        @media (max-width: 420px) {
            .grid {
                grid-template-columns: 1fr;
            }
        }

        /* =========================================================
       Responsive sizing tuned to common real‑world resolutions
       Mobile: 360×800, 390×844, 393×873
       Tablet: 768×1024, 810×1080, 820×1180
       Desktop: 1280–1920, plus ultrawide & 4K additions
       =======================================================*/

        /* 360+ (most common small-mobile width) */
        @media (min-width: 360px) {
            .btn {
                font-size: clamp(1.05rem, 2.6vw, 1.2rem);
                padding: 14px 16px;
            }

            .brand h1 {
                font-size: clamp(24px, 6vw, var(--tpc-hero-max));
            }
        }

        /* 390–430 (iPhone 12–15 families incl. 390×844, 393×873) */
        @media (min-width: 390px) {
            .btn {
                font-size: clamp(1.1rem, 2.2vw, 1.25rem);
                padding: 15px 18px;
            }

            .brand h1 {
                font-size: clamp(26px, 5.5vw, 48px);
            }
        }

        /* 480+ (large phones / landscape phones) */
        @media (min-width: 480px) {
            .grid {
                grid-template-columns: repeat(3, minmax(0, 1fr));
            }
        }

        /* 600+ (phablets / small tablets portrait) */
        @media (min-width: 600px) {
            .brand .logo {
                width: 56px;
                height: 56px;
            }

            .brand h1 {
                font-size: clamp(28px, 4.8vw, 52px);
            }
        }

        /* 768+ (iPad portrait – top tablet res) */
        @media (min-width: 768px) {
            .shell {
                max-width: 1100px;
            }

            .btn {
                font-size: clamp(1.05rem, 1.6vw, 1.2rem);
            }
        }

        /* 820+ (iPad Air/Pro portrait – 810/820 widths) */
        @media (min-width: 820px) {
            .brand h1 {
                font-size: clamp(30px, 4vw, 56px);
            }
        }

        /* 1024+ (iPad landscape / small laptops) */
        @media (min-width: 1024px) {
            .shell {
                max-width: 1150px;
            }

            .brand .logo {
                width: 64px;
                height: 64px;
            }

            .btn {
                font-size: clamp(1.05rem, 1.2vw, 1.25rem);
                padding: 16px 18px;
            }
        }

        /* 1280+ (common laptop) */
        @media (min-width: 1280px) {
            .shell {
                max-width: 1200px;
            }

            .panel,
            .card {
                border-radius: 22px;
            }
        }

        /* 1440+ (large desktop) */
        @media (min-width: 1440px) {
            .shell {
                max-width: 1280px;
            }

            .brand h1 {
                font-size: clamp(36px, 3.2vw, 60px);
            }
        }

        /* 1920+ (1080p – most common desktop res) */
        @media (min-width: 1920px) {
            .shell {
                max-width: 1400px;
            }

            .panel {
                padding: 22px;
            }

            .btn {
                font-size: 1.25rem;
                padding: 16px 20px;
            }
        }

        /* 2560+ (QHD / 1440p monitors) */
        @media (min-width: 2560px) {
            .shell {
                max-width: 1600px;
            }

            .brand h1 {
                font-size: clamp(42px, 2.6vw, 68px);
            }
        }

        /* 3440+ (Ultra‑wide 3440×1440) */
        @media (min-width: 3440px) {
            .shell {
                max-width: 1800px;
            }

            .btn {
                font-size: 1.3rem;
            }
        }

        /* 3840+ (4K UHD) */
        @media (min-width: 3840px) {
            .shell {
                max-width: 1960px;
            }

            .panel {
                padding: 26px;
            }

            .brand h1 {
                font-size: clamp(48px, 2vw, 76px);
            }
        }