:root{
    --bg:#eff6fc;
    --surface:#ffffff;
    --surface-2:#e3eff9;
    --band:#cfe7f8;
    --ink:#16244a;
    --ink-soft:#4c5a75;
    --ink-faint:#7c8aa3;
    --accent:#2f6690;
    --accent-hover:#22506f;
    --accent-ink:#ffffff;
    --dot:#2f6690;
    --dash:#b84438;
    --line:#d7e4f0;
    --focus:#2f6690;
    --shadow:0 20px 40px -24px rgba(22,36,74,0.35);
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --bg:#0a1420;
      --surface:#0f1c2e;
      --surface-2:#132436;
      --band:#152a41;
      --ink:#eaf1fb;
      --ink-soft:#a3b3c9;
      --ink-faint:#71829c;
      --accent:#79b2d8;
      --accent-hover:#94c2e1;
      --accent-ink:#0a1420;
      --dot:#79b2d8;
      --dash:#e08b7c;
      --line:#203348;
      --focus:#79b2d8;
      --shadow:0 20px 40px -24px rgba(0,0,0,0.6);
    }
  }
  :root[data-theme="dark"]{
    --bg:#0a1420;
    --surface:#0f1c2e;
    --surface-2:#132436;
    --band:#152a41;
    --ink:#eaf1fb;
    --ink-soft:#a3b3c9;
    --ink-faint:#71829c;
    --accent:#79b2d8;
    --accent-hover:#94c2e1;
    --accent-ink:#0a1420;
    --dot:#79b2d8;
    --dash:#e08b7c;
    --line:#203348;
    --focus:#79b2d8;
    --shadow:0 20px 40px -24px rgba(0,0,0,0.6);
  }

  *{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3{
    font-family:"Big Shoulders Display","Arial Narrow",sans-serif;
    font-weight:800;
    text-transform:uppercase;
    letter-spacing:0.01em;
    text-wrap:balance;
    color:var(--ink);
    margin:0;
  }
  .mono{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;}
  a{color:inherit;}
  img{display:block;max-width:100%;}
  button{font-family:inherit;}
  :focus-visible{outline:2px solid var(--focus);outline-offset:3px;}

  .wrap{max-width:1080px;margin:0 auto;padding:0 28px;}

  /* ---------- nav ---------- */
  .nav{
    position:sticky;top:0;z-index:20;
    background:color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav .wrap{
    display:flex;align-items:center;justify-content:space-between;
    padding-top:14px;padding-bottom:14px;
  }
  .brand{
    font-family:"Big Shoulders Display",sans-serif;
    font-weight:800;
    font-size:22px;
    line-height:0.85;
    letter-spacing:0.02em;
    color:var(--ink);
    text-decoration:none;
  }
  .brand small{display:block;font-size:0.7em;color:var(--accent);}

  /* ---------- Google Play badge ---------- */
  .play-badge{
    display:inline-block;line-height:0;border-radius:8px;
    transition:transform .15s ease, filter .15s ease;
  }
  .play-badge:hover{filter:brightness(1.15);}
  .play-badge img{display:block;}
  .appstore-badge{
    display:inline-block;line-height:0;
    transition:transform .15s ease, filter .15s ease;
  }
  .appstore-badge:hover{filter:brightness(1.15);}
  .appstore-badge img{display:block;}
  .store-badges{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
  .badge-sm img{height:40px;width:auto;}
  .badge-lg img{height:54px;width:auto;}

  /* ---------- hero ---------- */
  .hero{padding:64px 0 56px;}
  .hero-grid{
    display:grid;grid-template-columns:1.1fr 0.9fr;gap:48px;align-items:center;
  }
  .hero-grid > *{min-width:0;}
  @media(max-width:860px){.hero-grid{grid-template-columns:1fr;gap:36px;}}
  .eyebrow{
    font-family:"IBM Plex Mono",monospace;
    font-size:12px;letter-spacing:0.08em;text-transform:uppercase;
    color:var(--accent);
    margin:0 0 16px;
    display:flex;align-items:center;gap:10px;
  }
  .eyebrow .signal{display:inline-flex;gap:3px;align-items:center;}
  .eyebrow .signal i{display:block;background:var(--dot);border-radius:1px;}
  .eyebrow .signal i.dot{width:4px;height:4px;border-radius:50%;}
  .eyebrow .signal i.dash{width:12px;height:4px;background:var(--dash);}
  h1.headline{font-size:clamp(40px,6vw,68px);line-height:0.95;}
  h1.headline em{font-style:normal;color:var(--accent);}
  .sub{
    font-size:18px;color:var(--ink-soft);
    max-width:46ch;margin:20px 0 0;
  }
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:30px;}
  .btn-ghost{
    background:transparent;color:var(--ink);
    border:1px solid var(--line);border-radius:999px;
    padding:14px 22px;font-size:15px;font-weight:600;
    cursor:pointer;text-decoration:none;display:inline-block;
  }
  .hero-note{font-size:13px;color:var(--ink-faint);margin-top:14px;}

  /* live morse blinker card */
  .blinker-card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:22px;padding:28px;box-shadow:var(--shadow);
    min-width:0;max-width:100%;
  }
  .blinker-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;}
  .blinker-label{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);}
  .blinker-ctrl{display:flex;align-items:center;gap:12px;}
  .sound-btn{
    display:inline-flex;align-items:center;justify-content:center;
    width:36px;height:36px;padding:0;border-radius:50%;
    background:var(--surface-2);color:var(--ink-soft);
    border:1px solid var(--line);cursor:pointer;
    transition:background .15s ease, color .15s ease;
  }
  .sound-btn[hidden]{display:none;}
  .sound-btn:hover{background:var(--band);color:var(--ink);}
  .sound-btn .icon-sound{display:none;}
  .sound-btn[aria-pressed="true"]{color:var(--accent);border-color:var(--accent);}
  .sound-btn[aria-pressed="true"] .icon-sound{display:block;}
  .sound-btn[aria-pressed="true"] .icon-muted{display:none;}
  .blinker-lamp{
    width:16px;height:16px;border-radius:50%;
    background:var(--line);
    transition:background .05s linear, box-shadow .05s linear;
  }
  .blinker-lamp.on{background:var(--dot);box-shadow:0 0 18px 2px color-mix(in srgb, var(--dot) 70%, transparent);}
  button.blinker-lamp{
    display:block;position:relative;padding:0;border:0;cursor:pointer;
    -webkit-appearance:none;appearance:none;flex:none;
  }
  button.blinker-lamp::before{content:"";position:absolute;inset:-10px;}
  button.blinker-lamp:disabled{cursor:default;}
  .blinker-lamp.paused{background:transparent;box-shadow:inset 0 0 0 2px var(--ink-faint);}
  .blinker-text{
    font-family:"IBM Plex Mono",monospace;
    font-size:15px;color:var(--ink);
    background:var(--surface-2);border:1px solid var(--line);
    border-radius:12px;padding:16px;min-height:52px;
    white-space:pre;overflow:hidden;letter-spacing:0.08em;
    width:100%;max-width:100%;height:52px;line-height:20px;
  }
  .blinker-caption{margin-top:12px;font-size:13px;color:var(--ink-faint);}
  .blinker-text .sym-on{color:#c62828;font-weight:700;}
  @media (prefers-color-scheme: dark){
    .blinker-text .sym-on{color:#ff6b6b;}
  }

  section{padding:56px 0;}
  .section-head{max-width:56ch;margin-bottom:36px;}
  .section-head .eyebrow{margin-bottom:10px;}
  h2.section-title{font-size:clamp(28px,4vw,42px);}
  .section-head p{color:var(--ink-soft);font-size:17px;margin:14px 0 0;}

  /* ---------- modes ---------- */
  .modes-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  @media(max-width:900px){.modes-grid{grid-template-columns:1fr;max-width:420px;margin:0 auto;}}
  .mode-card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:24px;overflow:hidden;box-shadow:var(--shadow);
    display:flex;flex-direction:column;
  }
  .mode-shot{
    background:var(--band);
    padding:22px 22px 0;
    display:flex;justify-content:center;
  }
  .phone{
    width:180px;border-radius:20px 20px 0 0;overflow:hidden;
    border:1px solid color-mix(in srgb, var(--ink) 12%, transparent);
    border-bottom:none;
    box-shadow:0 12px 24px -14px rgba(22,36,74,0.4);
  }
  .phone img{width:100%;height:auto;display:block;}
  .mode-body{padding:24px 24px 26px;}
  .mode-kicker{
    font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.06em;
    text-transform:uppercase;color:var(--accent);margin-bottom:8px;
  }
  .mode-title{font-size:24px;margin-bottom:10px;}
  .mode-body p{color:var(--ink-soft);font-size:14.5px;margin:0 0 14px;}
  .mode-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px;}
  .mode-list li{
    display:flex;gap:9px;font-size:13.5px;color:var(--ink-soft);
    align-items:flex-start;
  }
  .mode-list li::before{
    content:"";flex:none;width:8px;height:8px;margin-top:5px;border-radius:50%;
    background:var(--dot);
  }
  .mode-list li.dash::before{border-radius:2px;width:12px;background:var(--dash);}

  /* ---------- why grid ---------- */
  .why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
  @media(max-width:900px){.why-grid{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:560px){.why-grid{grid-template-columns:1fr;}}
  .why-card{
    background:var(--surface);border:1px solid var(--line);border-radius:18px;
    padding:22px 20px;
  }
  .why-glyph{
    font-family:"IBM Plex Mono",monospace;color:var(--dash);
    font-size:15px;letter-spacing:0.08em;margin-bottom:14px;
  }
  .why-card h3{font-family:"IBM Plex Sans";text-transform:none;font-weight:700;font-size:16.5px;letter-spacing:0;margin-bottom:8px;}
  .why-card p{font-size:13.5px;color:var(--ink-soft);margin:0;}

  /* ---------- faq ---------- */
  .faq-list{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;}
  .faq-item{background:var(--surface);padding:22px 24px;}
  .faq-item summary{
    cursor:pointer;font-weight:700;font-size:15.5px;list-style:none;
    display:flex;justify-content:space-between;align-items:center;gap:16px;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary::after{
    content:"+";flex:none;font-family:"IBM Plex Mono",monospace;font-size:20px;color:var(--accent);
    transition:transform .15s ease;
  }
  .faq-item[open] summary::after{transform:rotate(45deg);}
  .faq-item p{color:var(--ink-soft);font-size:14.5px;margin:14px 0 0;max-width:64ch;}

  /* ---------- waitlist ---------- */
  .waitlist{
    background:var(--ink);color:var(--bg);
    border-radius:28px;padding:48px 40px;
    display:grid;grid-template-columns:1.1fr 1fr;gap:36px;align-items:center;
  }
  .waitlist h2{color:var(--bg);}
  .waitlist-eyebrow{color:color-mix(in srgb, var(--accent) 60%, var(--bg) 40%) !important;}
  .waitlist p{color:color-mix(in srgb, var(--bg) 65%, var(--ink-soft) 35%);}
  @media(max-width:860px){.waitlist{grid-template-columns:1fr;padding:36px 24px;}}
  .waitlist-form{display:flex;flex-direction:column;gap:12px;}
  .field-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;}
  .form-note{font-size:12.5px;color:color-mix(in srgb, var(--bg) 55%, transparent);}

  /* ---------- feedback ---------- */
  .feedback-card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:24px;padding:36px;box-shadow:var(--shadow);
    max-width:640px;
  }
  .feedback-field{margin-bottom:18px;}
  .feedback-field label{
    display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:8px;
  }
  .feedback-field textarea{
    width:100%;font-family:inherit;font-size:15px;color:var(--ink);
    background:var(--surface-2);border:1px solid var(--line);border-radius:12px;
    padding:12px 14px;resize:vertical;
  }
  .feedback-field textarea{min-height:110px;}
  .feedback-meta{
    display:flex;justify-content:flex-end;margin-top:6px;
    font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--ink-faint);
  }
  .feedback-meta.limit{color:var(--dash);}
  .feedback-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;}
  .btn-feedback-secondary{
    background:transparent;color:var(--ink);border:1px solid var(--accent);border-radius:999px;
    padding:12px 22px;font-size:14px;font-weight:600;cursor:pointer;
    transition:background .15s ease;
  }
  .btn-feedback-secondary:hover{background:var(--surface-2);}
  .feedback-fallback{font-size:14px;color:var(--ink-soft);margin:16px 0 0;}
  .feedback-fallback a{color:var(--accent);font-weight:600;}
  .btn-feedback{
    background:var(--accent);color:var(--accent-ink);border:none;border-radius:999px;
    padding:14px 28px;font-size:15px;font-weight:700;cursor:pointer;
    transition:background .15s ease;
  }
  .btn-feedback:hover{background:var(--accent-hover);}
  .btn-feedback:disabled{opacity:0.6;cursor:default;}
  .feedback-status{font-size:14px;margin-top:14px;min-height:1.3em;}
  .feedback-status.ok{color:var(--dot);}
  .feedback-status.err{color:var(--dash);}

  /* ---------- try it (Morse player) ---------- */
  .try-card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:24px;padding:36px;box-shadow:var(--shadow);
    max-width:720px;
  }
  @media(max-width:560px){.try-card{padding:22px 18px;}}
  .try-morse-label{font-size:13.5px;font-weight:600;color:var(--ink);margin:0 0 8px;}
  .try-morse{
    position:relative;
    font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;
    font-size:20px;line-height:1.9;color:var(--ink);
    background:var(--surface-2);border:1px solid var(--line);border-radius:12px;
    padding:12px 14px;min-height:56px;max-height:220px;overflow-y:auto;
    overflow-wrap:anywhere;margin-bottom:22px;
  }
  .try-morse.empty{font-size:14px;color:var(--ink-soft);}
  .try-morse .mc{display:inline-block;padding:0 3px;margin-right:.3em;border-radius:4px;}
  .try-morse .mw{margin-right:1.1em;}
  .try-morse .mc.on{background:#c62828;color:#ffffff;}
  @media (prefers-color-scheme: dark){
    .try-morse .mc.on{background:#ff6b6b;color:#0a1420;}
  }
  .try-controls{display:grid;grid-template-columns:1fr;gap:18px;margin-bottom:18px;}
  @media(min-width:600px){.try-controls{grid-template-columns:1fr 1fr;}}
  .try-ctl label{display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:8px;}
  .try-row{display:flex;align-items:center;gap:12px;}
  .try-row input[type="range"]{flex:1;min-width:0;height:28px;accent-color:var(--accent);margin:0;}
  .try-num{
    width:5.5rem;font-family:inherit;font-size:15px;color:var(--ink);
    background:var(--surface-2);border:1px solid var(--line);border-radius:10px;
    padding:8px 10px;
  }
  .try-adv{margin-bottom:18px;border-top:1px solid var(--line);padding-top:14px;}
  .try-adv summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--ink);padding:4px 0;}
  .try-adv .try-ctl{margin-top:14px;max-width:340px;}
  .try-hint{font-size:13px;color:var(--ink-soft);margin:10px 0 0;}
  .try-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;}
  .link-btn{
    background:none;border:none;padding:8px 4px;cursor:pointer;
    color:var(--accent);font-size:14px;font-weight:600;text-decoration:underline;
  }
  .link-btn:hover{color:var(--accent-hover);}
  .try-note{font-size:13px;color:var(--ink-soft);margin:8px 0 0;min-height:1.2em;}
  .footer-links{display:flex;gap:18px;flex-wrap:wrap;}

  footer{padding:44px 0 60px;}
  .footer-grid{
    display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;
    color:var(--ink-faint);font-size:13px;
  }
  .footer-brand{display:flex;align-items:center;gap:10px;color:var(--ink-soft);font-weight:600;}
  .footer-mark{
    width:26px;height:26px;border-radius:8px;background:var(--accent);
    color:var(--accent-ink);display:flex;align-items:center;justify-content:center;
    font-family:"IBM Plex Mono",monospace;font-size:11px;font-weight:700;
  }
  footer a{color:var(--ink-soft);text-decoration:none;}
  footer a:hover{text-decoration:underline;}