.ez-pwa-install{
            position:fixed;bottom:20px;right:20px;
            display:none;align-items:center;gap:10px;
            padding:11px 18px 11px 14px;border-radius:999px;
            background:linear-gradient(135deg,#3680ED 0%,#2060C0 100%);
            color:#fff;border:0;cursor:pointer;
            font:800 13px/1 'Inter',system-ui,-apple-system,sans-serif;
            letter-spacing:.01em;
            box-shadow:0 12px 28px -8px rgba(54,128,237,.5),0 4px 12px -4px rgba(54,128,237,.35);
            transition:transform .18s ease,box-shadow .18s ease,filter .18s ease,opacity .2s ease;
            z-index:99997;
            animation:ezPwaPop .32s cubic-bezier(.16,1,.3,1);
        }
        .ez-pwa-install.show{display:inline-flex}
        .ez-pwa-install:hover{transform:translateY(-2px);box-shadow:0 18px 40px -12px rgba(54,128,237,.6);filter:brightness(1.04)}
        .ez-pwa-install:active{transform:translateY(0)}
        .ez-pwa-install .ic{
            display:grid;place-items:center;width:24px;height:24px;
            border-radius:50%;background:rgba(255,255,255,.22);
            font-size:11px;flex-shrink:0;
        }
        .ez-pwa-install .ic svg{width:12px;height:12px}
        .ez-pwa-install .x{
            display:grid;place-items:center;width:20px;height:20px;
            border-radius:50%;background:rgba(255,255,255,.14);
            font-size:10px;line-height:1;
            margin-left:2px;cursor:pointer;
            border:0;color:#fff;transition:background .15s;
        }
        .ez-pwa-install .x:hover{background:rgba(255,255,255,.28)}
        @keyframes ezPwaPop{from{opacity:0;transform:translateY(10px) scale(.94)}to{opacity:1;transform:none}}
        @media (max-width:480px){
            .ez-pwa-install{bottom:14px;right:14px;left:14px;justify-content:center;padding:12px 16px}
        }
        @media (prefers-reduced-motion:reduce){
            .ez-pwa-install{animation:none;transition:none}
        }

        /* ── iOS Add-to-Home-Screen education banner ────────────────── */
        .ez-ios-edu{
            position:fixed;left:14px;right:14px;bottom:14px;z-index:99994;
            padding:16px 18px 14px;border-radius:20px;
            background:rgba(255,255,255,.94);color:#0f172a;
            backdrop-filter:blur(24px) saturate(180%);
            -webkit-backdrop-filter:blur(24px) saturate(180%);
            border:0.5px solid rgba(15,23,42,.08);
            box-shadow:0 24px 60px -18px rgba(15,23,42,.28),0 8px 20px -8px rgba(15,23,42,.1);
            transform:translateY(20px);opacity:0;
            transition:transform .34s cubic-bezier(.16,1,.3,1),opacity .28s ease;
            max-width:440px;margin:0 auto;
            font-family:-apple-system,BlinkMacSystemFont,'SF Pro Display','Inter',system-ui,sans-serif;
        }
        .ez-ios-edu.show{transform:translateY(0);opacity:1}
        .ez-ios-edu .x{
            position:absolute;top:12px;right:14px;
            width:26px;height:26px;border-radius:50%;
            background:rgba(15,23,42,.06);border:0;
            color:#64748b;font-size:16px;line-height:1;cursor:pointer;
        }
        .ez-ios-edu .x:hover{background:rgba(15,23,42,.1);color:#0f172a}
        .ez-ios-edu .hd{display:flex;gap:12px;align-items:center;margin-bottom:14px}
        .ez-ios-edu .hd .ic{
            width:42px;height:42px;border-radius:12px;flex-shrink:0;
            background:linear-gradient(135deg,#3680ED,#2060C0);color:#fff;
            display:grid;place-items:center;
            box-shadow:0 8px 18px -6px rgba(54,128,237,.5);
        }
        .ez-ios-edu .hd .ic svg{width:20px;height:20px}
        .ez-ios-edu .hd .t{font:800 15px/1.2 inherit;color:#0f172a;letter-spacing:-.01em}
        .ez-ios-edu .hd .s{font:500 12.5px/1.4 inherit;color:#64748b;margin-top:2px}
        .ez-ios-edu .steps{
            display:grid;grid-template-columns:repeat(3,1fr);gap:8px;
            padding:12px;background:#f8fafc;border-radius:14px;
        }
        .ez-ios-edu .step{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center}
        .ez-ios-edu .step .n{
            width:22px;height:22px;border-radius:50%;
            background:#0f172a;color:#fff;
            display:grid;place-items:center;
            font:800 11px/1 inherit;
        }
        .ez-ios-edu .step .lbl{font:700 11px/1.2 inherit;color:#0f172a;letter-spacing:-.005em}
        .ez-ios-edu .step .ic-step{color:#94a3b8}
        .ez-ios-edu .ft{margin-top:10px;font-size:10.5px;color:#94a3b8;text-align:center;letter-spacing:.02em}
        .ez-ios-edu .ft i{font-style:normal;font-weight:600}
        @media (prefers-reduced-motion:reduce){.ez-ios-edu{transition:none}}

        /* ── Push soft-ask card ────────────────────────────────────── */
        .ez-push-card{
            position:fixed;bottom:20px;left:20px;right:20px;max-width:400px;
            display:none;flex-direction:column;gap:12px;
            padding:20px 22px;border-radius:20px;
            background:#fff;color:#0f172a;
            border:1px solid #eef1f5;
            box-shadow:0 24px 60px -20px rgba(15,23,42,.24),0 8px 20px -6px rgba(15,23,42,.1);
            font:500 13.5px/1.5 'Inter',system-ui,-apple-system,sans-serif;
            z-index:99996;
            animation:ezPwaPop .32s cubic-bezier(.16,1,.3,1);
        }
        .ez-push-card.show{display:flex}
        .ez-push-hd{display:flex;align-items:center;gap:12px}
        .ez-push-hd-ic{
            width:44px;height:44px;border-radius:14px;flex-shrink:0;
            display:grid;place-items:center;color:#fff;
            background:linear-gradient(135deg,#3680ED,#2060C0);
            box-shadow:0 8px 18px -6px rgba(54,128,237,.5);
        }
        .ez-push-hd-ic svg{width:20px;height:20px}
        .ez-push-hd-txt{flex:1;min-width:0}
        .ez-push-hd-title{font:800 15px/1.25 inherit;letter-spacing:-.01em;color:#0f172a}
        .ez-push-hd-sub{font-size:12.5px;color:#64748b;margin-top:3px}
        .ez-push-x{
            position:absolute;top:12px;right:14px;
            width:26px;height:26px;border-radius:50%;
            background:transparent;border:0;color:#94a3b8;
            font-size:20px;line-height:1;cursor:pointer;
            transition:background .15s,color .15s;
        }
        .ez-push-x:hover{background:#f1f5f9;color:#0f172a}
        .ez-push-cats{display:flex;flex-direction:column;gap:6px;margin:6px 0 0}
        .ez-push-cat{
            display:flex;align-items:center;gap:10px;
            padding:9px 12px;border-radius:11px;
            background:#f8fafc;border:1px solid #eef1f5;
            cursor:pointer;transition:all .15s ease;
        }
        .ez-push-cat:hover{border-color:rgba(54,128,237,.28);background:#F4F8FE}
        .ez-push-cat input{
            width:16px;height:16px;accent-color:#3680ED;flex-shrink:0;cursor:pointer;
        }
        .ez-push-cat-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
        .ez-push-cat-name{display:block;font:700 12.5px/1.25 inherit;color:#0f172a;letter-spacing:-.005em}
        .ez-push-cat-desc{display:block;font:500 11px/1.35 inherit;color:#64748b}
        .ez-push-cta{
            display:flex;align-items:center;justify-content:center;gap:8px;
            padding:12px 18px;border-radius:12px;
            background:linear-gradient(135deg,#3680ED,#2060C0);
            color:#fff;border:0;cursor:pointer;
            font:800 13.5px/1 inherit;letter-spacing:.02em;
            box-shadow:0 10px 24px -8px rgba(54,128,237,.5);
            transition:transform .18s ease,box-shadow .18s ease,filter .18s ease;
            margin-top:4px;
        }
        .ez-push-cta:hover{transform:translateY(-2px);box-shadow:0 16px 32px -10px rgba(54,128,237,.6);filter:brightness(1.04)}
        .ez-push-cta:disabled{opacity:.65;cursor:not-allowed;transform:none}
        .ez-push-later{
            background:transparent;color:#64748b;border:0;cursor:pointer;
            font:600 12px/1 inherit;padding:8px 12px;border-radius:8px;
            text-decoration:none;transition:background .15s ease,color .15s ease;
            -webkit-user-select:none;-moz-user-select:none;user-select:none;
            -webkit-tap-highlight-color:transparent;
        }
        .ez-push-later:hover{background:#f1f5f9;color:#0f172a;text-decoration:none}
        .ez-push-later:focus-visible{outline:2px solid rgba(54,128,237,.4);outline-offset:2px}
        .ez-push-later::selection,.ez-push-later::-moz-selection{background:transparent;color:inherit}
        .ez-push-actions{display:flex;align-items:center;justify-content:space-between;gap:8px}
        .ez-push-msg{
            font-size:11.5px;color:#64748b;font-weight:600;
            text-align:center;min-height:14px;
        }
        .ez-push-msg.ok{color:#087F5B}
        .ez-push-msg.err{color:#2060C0}
        @media (max-width:480px){
            .ez-push-card{bottom:14px;left:14px;right:14px;max-width:none}
        }

        /* ── Site theme toggle (body.theme-dark) — design.md §2.2 ─────
           Covers users who toggle the site to dark on a light-OS device;
           the @media (prefers-color-scheme:dark) blocks above only fire
           when the OS itself is dark. Uses canonical dark tokens. */
        body.theme-dark .ez-ios-edu{
            background:rgba(23,23,26,.92);color:#F5F5F6;
            border-color:rgba(255,255,255,.09);
            box-shadow:0 24px 60px -18px rgba(0,0,0,.6),0 8px 20px -8px rgba(0,0,0,.5);
        }
        body.theme-dark .ez-ios-edu .x{background:rgba(255,255,255,.08);color:#A0A0A6}
        body.theme-dark .ez-ios-edu .x:hover{background:rgba(255,255,255,.14);color:#F5F5F6}
        body.theme-dark .ez-ios-edu .hd .t{color:#F5F5F6}
        body.theme-dark .ez-ios-edu .hd .s{color:#A0A0A6}
        body.theme-dark .ez-ios-edu .steps{background:rgba(255,255,255,.05)}
        body.theme-dark .ez-ios-edu .step .n{background:#F5F5F6;color:#0F0F11}
        body.theme-dark .ez-ios-edu .step .lbl{color:#F5F5F6}
        body.theme-dark .ez-ios-edu .step .ic-step{color:#77777D}
        body.theme-dark .ez-ios-edu .ft{color:#A0A0A6}

        body.theme-dark .ez-push-card{
            background:#17171A;color:#F5F5F6;
            border-color:rgba(255,255,255,.09);
            box-shadow:0 24px 60px -20px rgba(0,0,0,.6),0 8px 20px -6px rgba(0,0,0,.5);
        }
        body.theme-dark .ez-push-hd-title{color:#F5F5F6}
        body.theme-dark .ez-push-hd-sub{color:#A0A0A6}
        body.theme-dark .ez-push-x{color:#A0A0A6}
        body.theme-dark .ez-push-x:hover{background:rgba(255,255,255,.06);color:#F5F5F6}
        body.theme-dark .ez-push-cat{background:#1C1C1F;border-color:rgba(255,255,255,.09)}
        body.theme-dark .ez-push-cat:hover{background:rgba(54,128,237,.10);border-color:rgba(96,164,245,.28)}
        body.theme-dark .ez-push-cat-name{color:#F5F5F6}
        body.theme-dark .ez-push-cat-desc{color:#A0A0A6}
        body.theme-dark .ez-push-msg{color:#A0A0A6}
        body.theme-dark .ez-push-msg.ok{color:#0CA678}
        body.theme-dark .ez-push-msg.err{color:#E03131}
        body.theme-dark .ez-push-later{color:#A0A0A6}
        body.theme-dark .ez-push-later:hover{background:rgba(255,255,255,.06);color:#F5F5F6}
        body.theme-dark .ez-push-later:focus-visible{outline-color:rgba(96,164,245,.4)}
        body.theme-dark .ez-pwa-install{
            box-shadow:0 12px 28px -8px rgba(0,0,0,.55),0 4px 12px -4px rgba(54,128,237,.4);
        }
        body.theme-dark .ez-pwa-install:hover{
            box-shadow:0 18px 40px -12px rgba(0,0,0,.65),0 4px 12px -4px rgba(54,128,237,.5);
        }