/* REFERENCE
 * purpose: Preserve the landing page presentation and app palette.
 * invariants: Self-hosted assets; responsive layout and visible focus states.
 * consumers: landing/index.html
 */
  /* Self-hosted app faces; Japanese files are further subset to this page's
     glyphs by scripts/subset-landing-fonts.py. No external font requests. */
  @font-face{font-family:'Shippori Mincho';font-style:normal;font-weight:500;font-display:swap;src:url('fonts/shippori-mincho-latin-500-normal.woff2') format('woff2')}
  @font-face{font-family:'Inter';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/inter-latin-400-normal.woff2') format('woff2')}
  @font-face{font-family:'Inter';font-style:normal;font-weight:500;font-display:swap;src:url('fonts/inter-latin-500-normal.woff2') format('woff2')}
  @font-face{font-family:'Inter';font-style:normal;font-weight:600;font-display:swap;src:url('fonts/inter-latin-600-normal.woff2') format('woff2')}
  @font-face{font-family:'BIZ UDPGothic';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/biz-udpgothic-jp-400-landing.woff2') format('woff2')}
  @font-face{font-family:'Noto Serif JP';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/noto-serif-jp-jp-400-landing.woff2') format('woff2')}
  @font-face{font-family:'Yuji Syuku';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/yuji-syuku-jp-400-landing.woff2') format('woff2')}
  @font-face{font-family:'Yusei Magic';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/yusei-magic-jp-400-landing.woff2') format('woff2')}
  @font-face{font-family:'DotGothic16';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/dotgothic16-jp-400-landing.woff2') format('woff2')}

  :root{
    /* Twilight Tea House — identical hex to the app's tailwind.config.ts
       (ink-700/600 are the 2026 warmed values; paper-dim is the app's muted
       text token, 5.4:1 on ink-700). Never drift from the app palette. */
    --ink-900:#0c0a09; --ink-800:#15110d; --ink-700:#231a12; --ink-600:#352716;
    --paper-50:#fbf6ec; --paper-100:#f4ecdb; --paper-200:#e6d8b8; --paper-300:#bca984;
    --paper-dim:#9a8e76;
    --lantern:#e8b04b; --lantern-dim:#a8742a; --lantern-glow:#f4cd7c;
    --ember:#b8351e; --moss:#5f7c3a;
    --display:'Shippori Mincho','Hiragino Mincho Pro','Yu Mincho',serif;
    --sans:'Inter',system-ui,sans-serif;
    --maxw:64rem;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  [hidden]{display:none!important}
  html{scroll-behavior:smooth}
  body{
    background:var(--ink-900); color:var(--paper-200);
    font-family:var(--sans); font-size:17px; line-height:1.6;
    -webkit-font-smoothing:antialiased; overflow-x:hidden;
    /* washi grain — the app proves 0.05 on the body (tailwind washi recipe) */
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
  }
  /* Sumi-e brush background — the app's actual Home screen art (dashboard-bg.svg),
     fixed behind everything like the main menu, faded so text stays AA. */
  .sumi{position:fixed;inset:0;z-index:-2;pointer-events:none;
    background:url('dashboard-bg.svg') center/cover no-repeat;opacity:.5}
  .vignette{position:fixed;inset:auto 0 0 0;height:34vh;z-index:-1;pointer-events:none;
    background:linear-gradient(to top, rgba(12,10,9,.85), rgba(12,10,9,.4) 55%, transparent)}
  a{color:inherit}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}
  .eyebrow{font-size:.72rem;letter-spacing:.26em;text-transform:uppercase;color:var(--paper-300)}
  h1,h2,h3{font-family:var(--display);color:var(--paper-50);font-weight:500;line-height:1.08;letter-spacing:-.01em}
  .kana{line-height:1}

  /* ---- app-style masthead (mirrors the main menu header) ---- */
  .masthead{text-align:center;padding-top:clamp(2.5rem,6vh,4rem)}
  .masthead .divider{margin:0 auto 1.5rem;width:8rem;height:2px;
    background:linear-gradient(90deg,transparent 0%,rgba(188,169,132,.35) 20%,rgba(232,176,75,.45) 50%,rgba(188,169,132,.35) 80%,transparent 100%)}
  .masthead .mark{font-family:var(--display);font-weight:500;font-size:clamp(2.6rem,6vw,3.2rem);
    color:var(--paper-50);letter-spacing:-.02em;line-height:.95}
  .masthead .tagline{margin-top:.55rem;font-size:.78rem;letter-spacing:.4em;text-transform:uppercase;color:var(--paper-dim)}
  .masthead .echo{margin-top:.8rem;font-family:'Yuji Syuku',serif;font-size:1.15rem;color:var(--paper-300)}

  /* ---- lantern atmosphere ---- */
  .glow{position:fixed;inset:auto 0 -20vh 0;height:60vh;pointer-events:none;z-index:0;
    background:radial-gradient(60% 70% at 50% 100%, color-mix(in srgb, var(--lantern) 18%, transparent), transparent 70%);
    filter:blur(6px);animation:flicker 6s ease-in-out infinite}
  @keyframes flicker{0%,100%{opacity:.9}50%{opacity:.72}}
  @media (prefers-reduced-motion:reduce){.glow{animation:none}*{animation:none!important}}

  /* ---- hero ---- */
  header.hero{position:relative;z-index:1;padding:clamp(3.5rem,9vh,7rem) 0 4rem;overflow:hidden}
  .ghost{position:absolute;right:-4%;top:-6%;font-family:'Noto Serif JP',serif;font-size:min(58vw,30rem);
    color:var(--paper-50);opacity:.035;z-index:-1;user-select:none;pointer-events:none}
  .hero h1{font-size:clamp(2.4rem,6.5vw,4.4rem);margin:1.6rem 0 0;max-width:18ch}
  .hero h1 em{font-style:normal;color:var(--lantern)}
  .lede{margin-top:1.4rem;max-width:46ch;font-size:1.12rem;color:var(--paper-200)}
  .cta-row{display:flex;flex-wrap:wrap;gap:.8rem;align-items:center;margin-top:2.2rem}
  .btn{display:inline-flex;align-items:center;gap:.5rem;min-height:52px;padding:0 1.5rem;border-radius:.85rem;
    font-family:var(--sans);font-weight:600;font-size:1rem;cursor:pointer;border:1px solid transparent;text-decoration:none;
    transition:transform .15s ease, background .15s ease, border-color .15s ease}
  .btn:active{transform:scale(.98)}
  .btn:disabled{opacity:.52;cursor:not-allowed;box-shadow:none}
  .btn-primary{background:var(--lantern);color:#1a1206;box-shadow:0 10px 30px -12px color-mix(in srgb,var(--lantern) 60%,transparent)}
  .btn-primary:hover{background:var(--lantern-glow)}
  .btn-ghost{background:transparent;color:var(--paper-100);border-color:var(--ink-600)}
  .btn-ghost:hover{border-color:var(--lantern)}
  .note{margin-top:.9rem;font-size:.86rem;color:var(--paper-300)}

  /* ---- five-font wedge ---- */
  section{position:relative;z-index:1;padding:4.5rem 0}
  .kicker{font-family:var(--display);font-size:clamp(1.5rem,3.6vw,2.3rem);max-width:20ch;margin-bottom:.4rem}
  .sub{color:var(--paper-300);max-width:52ch}
  .fonts{display:grid;grid-template-columns:repeat(5,1fr);gap:.7rem;margin-top:2.2rem}
  .face{background:var(--ink-800);border:1px solid var(--ink-600);border-radius:1rem;padding:1.4rem .5rem .8rem;text-align:center}
  .face .g{font-size:clamp(2.2rem,8vw,3.4rem);color:var(--paper-50);display:block}
  .face .lbl{display:block;margin-top:.7rem;font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--paper-300)}
  .f1{font-family:'BIZ UDPGothic',sans-serif}
  .f2{font-family:'Noto Serif JP',serif}
  .f3{font-family:'Yuji Syuku',serif}
  .f4{font-family:'Yusei Magic',sans-serif}
  .f5{font-family:'DotGothic16',sans-serif}
  @media (max-width:680px){.fonts{grid-template-columns:repeat(2,1fr)} .face:last-child{grid-column:1/-1}}

  /* ---- demo quiz ---- */
  .quiz{margin-top:2.2rem;background:linear-gradient(180deg,var(--ink-800),var(--ink-900));
    border:1px solid var(--ink-600);border-radius:1.25rem;padding:clamp(1.2rem,4vw,2rem);
    box-shadow:0 18px 42px -32px rgba(0,0,0,.9)}
  .quiz-top{display:flex;justify-content:space-between;gap:1rem;align-items:center;margin-bottom:1.2rem}
  .quiz-progress{font-variant-numeric:tabular-nums;color:var(--lantern);font-weight:600}
  .quiz-style{font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--paper-300)}
  .quiz-glyph{min-height:8rem;display:grid;place-items:center;font-size:clamp(5rem,17vw,8rem);
    color:var(--paper-50);border:1px solid var(--ink-600);border-radius:1rem;background:var(--ink-900)}
  .quiz-prompt{margin-top:1rem;color:var(--paper-300)}
  .quiz-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;margin-top:1rem}
  .quiz-option{min-height:52px;border:1px solid var(--ink-600);border-radius:.85rem;background:var(--ink-800);
    color:var(--paper-50);font:600 1rem var(--sans);cursor:pointer;transition:transform .15s ease,border-color .15s ease,background .15s ease}
  .quiz-option:hover{border-color:var(--lantern)}
  .quiz-option:active{transform:scale(.98)}
  .quiz-option.is-correct{background:var(--moss);border-color:var(--moss);color:var(--paper-50)}
  .quiz-option.is-wrong{background:var(--ember);border-color:var(--ember);color:var(--paper-50)}
  .quiz-option:disabled{cursor:default}
  .quiz-feedback{min-height:1.7rem;margin-top:.9rem;color:var(--paper-300)}
  .quiz-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1rem;align-items:center}
  .quiz-result{padding:1rem 0 .2rem}
  .quiz-result strong{font-family:var(--display);font-size:clamp(2.1rem,8vw,3.5rem);color:var(--lantern);font-weight:500}
  .quiz-option:focus-visible,.btn:focus-visible,form.wait input:focus-visible{outline:2px solid var(--lantern);outline-offset:3px}
  @media (max-width:560px){.quiz-options{grid-template-columns:1fr}}

  /* ---- confusion pairs ---- */
  .pairs{display:flex;flex-wrap:wrap;gap:1rem;margin-top:2rem}
  .pair{flex:1 1 12rem;background:linear-gradient(180deg,var(--ink-800),var(--ink-900));
    border:1px solid var(--ink-600);border-radius:1rem;padding:1.6rem 1.4rem}
  .pair .duo{font-family:'BIZ UDPGothic',sans-serif;font-size:2.6rem;color:var(--paper-50);display:flex;gap:1rem;align-items:baseline}
  .pair .duo .x{color:var(--ember);font-size:1.1rem;font-family:var(--sans)}
  .pair p{margin-top:.7rem;font-size:.92rem;color:var(--paper-300)}

  /* ---- refusal / positioning ---- */
  .refuse{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.8rem}
  .chip{font-size:.9rem;padding:.5rem .95rem;border-radius:999px;border:1px solid var(--ink-600);color:var(--paper-200)}
  .chip s{color:var(--paper-300);text-decoration-color:var(--ember)}

  /* ---- steps ---- */
  .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:2.2rem}
  .step{background:var(--ink-800);border:1px solid var(--ink-600);border-radius:1rem;padding:1.5rem}
  .step .n{font-family:var(--display);color:var(--lantern);font-size:1.1rem}
  .step h3{font-size:1.15rem;margin:.4rem 0 .4rem}
  .step p{font-size:.92rem;color:var(--paper-300)}
  @media (max-width:680px){.steps{grid-template-columns:1fr}}

  /* ---- final cta ---- */
  .final{background:var(--ink-800);border:1px solid var(--ink-600);border-radius:1.5rem;padding:clamp(2rem,5vw,3.5rem);text-align:center;margin:1rem 0}
  .final h2{font-size:clamp(1.8rem,5vw,2.8rem)}
  form.wait{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center;margin-top:1.6rem;max-width:30rem;margin-left:auto;margin-right:auto}
  form.wait input{flex:1 1 14rem;min-height:52px;padding:0 1.1rem;border-radius:.85rem;border:1px solid var(--ink-600);
    background:var(--ink-900);color:var(--paper-50);font-family:var(--sans);font-size:1rem}
  form.wait input::placeholder{color:var(--paper-300)}
  form.wait input:focus{outline:none;border-color:var(--lantern)}

  footer{padding:3rem 0 4rem;color:var(--paper-300);font-size:.85rem;text-align:center;position:relative;z-index:1}
  /* sumi-bleed — the app's brush-stroke divider token */
  hr{border:none;height:2px;margin:0 auto;max-width:var(--maxw);
    background:linear-gradient(90deg,transparent 0%,rgba(188,169,132,.35) 20%,rgba(232,176,75,.45) 50%,rgba(188,169,132,.35) 80%,transparent 100%)}