:root {
  --paper: #f7f7f2;
  --ink: #242621;
  --muted: #62665d;
  --line: #dddfd4;
  --accent: #f16b45;
  --accent-soft: #f9e5dc;
  --lime: #dfed93;
  --font: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--ink); outline-offset: 6px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
::selection { background: var(--lime); color: var(--ink); }
.page-shell { max-width: 1280px; margin: 0 auto; padding: 0 56px; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; padding: 12px 20px; background: var(--ink); color: white; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.site-header { min-height: 108px; display: flex; align-items: center; gap: 40px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 11px; font-family: Arial, sans-serif; font-weight: 800; font-size: 25px; letter-spacing: -1.2px; white-space: nowrap; }
.brand-symbol { display: grid; place-items: center; width: 34px; height: 34px; background: var(--ink); color: var(--lime); font-size: 28px; border-radius: 50%; }
.site-header nav { display: flex; margin-left: auto; gap: 28px; font-size: 12px; font-weight: 700; }
.site-header nav a { padding: 12px 0; }
.site-header nav a:hover, .closing-line a:hover { text-decoration: underline; text-underline-offset: 5px; }
.demo-label { display: flex; align-items: center; gap: 7px; padding: 8px 11px; border: 1px solid var(--line); border-radius: 20px; font-size: 9px; letter-spacing: 1px; white-space: nowrap; }
.demo-label > span { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; }
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 42px; align-items: center; padding: 76px 0 82px; }
.eyebrow { margin: 0 0 25px; display: flex; gap: 10px; align-items: center; font-family: Arial, sans-serif; font-size: 10px; line-height: 1.5; font-weight: 700; letter-spacing: 1.6px; }
.tiny-line { width: 23px; height: 2px; background: var(--accent); }
h1 { font-size: clamp(35px, 4vw, 51px); line-height: 1.65; font-weight: 800; letter-spacing: -2.7px; margin: 0; }
.accent-word { position: relative; white-space: nowrap; }
.accent-word::after { content: ""; position: absolute; z-index: -1; left: 0; right: 4px; bottom: 3px; height: 10px; background: var(--accent); transform: rotate(-2deg); opacity: .5; }
.hero-copy { position: relative; z-index: 1; }
.hero-description { margin: 25px 0 29px; font-size: 14px; color: var(--muted); line-height: 2.1; }
.button { display: inline-flex; justify-content: space-between; align-items: center; gap: 35px; min-height: 53px; padding: 14px 23px; border-radius: 7px; border: none; font-size: 13px; font-weight: 700; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-3px); }
.button:active { transform: translateY(0); }
.button-primary { background: var(--lime); color: var(--ink); }
.button-primary:hover { background: #d0e478; }
.button span { font-size: 19px; font-family: Arial, sans-serif; }
.hero-footnote { display: flex; align-items: center; gap: 8px; margin-top: 33px; font-family: Arial, sans-serif; font-size: 8px; letter-spacing: 1.2px; color: var(--muted); }
.small-star { font-size: 17px; color: var(--ink); }
.art-stage { position: relative; isolation: isolate; width: 100%; aspect-ratio: 1.04; overflow: hidden; border-radius: 18px; background: #eeeee5; }
.art-grid { position: absolute; inset: 0; background-image: linear-gradient(#dedfd533 1px, transparent 1px), linear-gradient(90deg, #dedfd533 1px, transparent 1px); background-size: 32px 32px; }
.art-corner { position: absolute; top: 25px; left: 27px; font-family: Arial, sans-serif; font-size: 8px; font-weight: 700; letter-spacing: 1.3px; }
.planet { position: absolute; width: 62%; aspect-ratio: 1; border-radius: 50%; background: var(--accent); top: 14%; left: 7%; transition: background .3s; }
.planet::after { content: ""; position: absolute; inset: 10%; border: 1px solid #ffffff45; border-radius: 50%; }
.planet-ring { position: absolute; inset: 32% -12%; border: 1px solid var(--ink); border-radius: 50%; transform: rotate(-34deg); }
.hello-card { position: absolute; width: 62%; top: 28%; left: 27%; background: #fffef8; border: 1px solid var(--ink); border-radius: 8px; box-shadow: 9px 10px 0 #2426210d; transform: rotate(7deg); }
.window-bar { display: flex; gap: 5px; align-items: center; padding: 10px 12px; border-bottom: 1px solid #2426213b; }
.window-bar > span:not(.window-name) { width: 5px; height: 5px; border: 1px solid var(--ink); border-radius: 50%; }
.window-name { margin-left: auto; font-family: Arial, sans-serif; font-size: 7px; color: var(--muted); }
.card-body { padding: 21px 23px 20px; }
.card-kicker { font-family: Arial, sans-serif; font-size: 6px; font-weight: 700; letter-spacing: 1px; }
.card-body > p { margin: 16px 0 22px; font-family: Arial, sans-serif; font-size: clamp(44px, 5.5vw, 69px); line-height: .98; font-weight: 800; letter-spacing: -4px; }
.hello-dot { color: var(--accent); }
.card-rule { display: block; width: 100%; height: 1px; background: var(--line); margin: 0 0 12px; }
.card-caption { font-family: Arial, sans-serif; font-size: 6px; letter-spacing: .8px; }
.art-star { position: absolute; left: 15%; bottom: 14%; font-family: Arial, sans-serif; color: var(--ink); font-size: 79px; line-height: 1; transform: rotate(-12deg); }
.art-note { position: absolute; right: 20px; top: 65px; font-family: Arial, sans-serif; font-size: 8px; letter-spacing: 1px; writing-mode: vertical-rl; }
.art-note span { margin-top: 9px; font-size: 19px; }
.art-coordinate { position: absolute; right: 25px; bottom: 23px; font-family: Arial, sans-serif; font-size: 7px; letter-spacing: 1px; }
.about { padding: 46px 0 50px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1.15fr .6fr; align-items: center; gap: 40px; }
.section-heading .eyebrow { margin-bottom: 16px; }
h2 { font-size: 27px; line-height: 1.8; letter-spacing: -1px; margin: 0; }
.about-copy { font-size: 13px; line-height: 2.1; color: var(--muted); }
.about-copy p { margin: 0 0 14px; }
.text-tag { display: inline-block; font-size: 10px; color: var(--ink); padding: 5px 9px; border: 1px solid var(--line); border-radius: 4px; }
.about-stamp { width: 158px; aspect-ratio: 1; border: 1px solid var(--line); border-radius: 50%; display: flex; flex-direction: column; align-items: center; justify-content: center; transform: rotate(-12deg); }
.about-stamp span { font-family: Arial, sans-serif; font-size: 8px; letter-spacing: 1px; }
.about-stamp strong { font-family: Georgia, serif; font-style: italic; font-size: 35px; font-weight: 400; margin: 9px 0; }
.playground { display: grid; grid-template-columns: 1fr 1.3fr; gap: 50px; margin-top: 22px; padding: 38px 43px; background: var(--accent-soft); border-radius: 14px; transition: background .3s; }
.playground-intro .eyebrow { margin-bottom: 12px; }
.playground-intro > p:last-child { font-size: 12px; line-height: 2; color: var(--muted); margin: 13px 0 0; }
.playground-controls { display: flex; flex-direction: column; justify-content: center; gap: 22px; }
.color-picker { border: 0; padding: 0; margin: 0; }
.color-picker legend { font-size: 11px; font-weight: 700; margin-bottom: 12px; padding: 0; }
.swatches { display: flex; align-items: center; gap: 12px; }
.swatch { width: 36px; height: 36px; border: 0; border-radius: 50%; display: grid; place-items: center; color: var(--ink); font-size: 16px; transition: transform .2s; }
.swatch:hover { transform: scale(1.1); }
.swatch-orange { background: #f16b45; }
.swatch-green { background: #70a585; }
.swatch-blue { background: #759cd5; }
.swatch[aria-pressed="true"] { box-shadow: 0 0 0 3px var(--accent-soft), 0 0 0 4px var(--ink); }
.swatch[aria-pressed="false"] > span { visibility: hidden; }
.color-name { margin-left: 6px; font-family: Arial, sans-serif; font-size: 9px; font-weight: 700; letter-spacing: 1px; }
.hello-test { display: flex; align-items: center; gap: 21px; }
.button-dark { color: var(--paper); background: var(--ink); min-width: 141px; min-height: 48px; padding: 12px 19px; font-size: 12px; }
.button-dark:hover { background: #3b4036; }
.hello-response { margin: 0; font-size: 11px; line-height: 1.9; }
.noscript-message { font-size: 11px; line-height: 1.8; }
.contact { display: grid; grid-template-columns: .8fr 1.4fr; align-items: start; gap: 72px; margin-top: 58px; padding: 49px 0 23px; border-top: 1px solid var(--line); }
.contact-intro .eyebrow { margin-bottom: 14px; }
.contact-intro > p:not(.eyebrow) { font-size: 13px; color: var(--muted); line-height: 2; }
.contact-flower { display: block; width: fit-content; margin: 32px 0; font-size: 65px; color: var(--accent); line-height: 1; }
.contact-intro .contact-note { max-width: 270px; font-size: 10px; line-height: 1.9; }
.contact-note a { text-decoration: underline; text-underline-offset: 3px; }
.contact-form { min-width: 0; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field { min-width: 0; margin-bottom: 19px; }
.form-field label { display: flex; align-items: center; gap: 9px; margin-bottom: 9px; font-size: 12px; font-weight: 700; }
.required-tag, .optional-tag { font-size: 9px; font-weight: 400; padding: 2px 5px; border-radius: 3px; }
.required-tag { color: var(--ink); background: var(--accent-soft); }
.optional-tag { color: var(--muted); background: #eaece4; }
.form-field input, .form-field textarea { display: block; width: 100%; max-width: 100%; border: 1px solid #c9cec0; border-radius: 7px; background: #fffef8; color: var(--ink); padding: 13px 14px; font-family: var(--font); font-size: 14px; line-height: 1.7; }
.form-field input { min-height: 48px; }
.form-field textarea { min-height: 154px; resize: vertical; }
.form-field input::placeholder, .form-field textarea::placeholder { color: #7b7f75; opacity: 1; font-size: 12px; }
.form-field input[aria-invalid="true"], .form-field textarea[aria-invalid="true"] { border-color: #a43b2c; }
.field-error { font-size: 11px; color: #a43b2c; line-height: 1.8; margin: 6px 0 0; }
.field-error:empty { display: none; }
.field-meta { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.character-count { margin: 7px 0 0 auto; color: var(--muted); font-size: 10px; white-space: nowrap; }
.contact-honeypot { display: none; }
.contact-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 17px; margin-top: 23px; }
.form-status { margin: 0; font-size: 11px; line-height: 1.8; color: var(--muted); }
.contact-submit-pending { opacity: .7; }
.thank-you-card { max-width: 500px; }
.thank-you-card .eyebrow { justify-content: center; }
.thank-you-symbol { color: var(--accent); font-size: 80px; }
.error-page .thank-you-card h1 { font-family: var(--font); font-size: 32px; letter-spacing: -1px; line-height: 1.6; }
.closing-line { display: flex; align-items: center; gap: 15px; margin: 40px 0 53px; }
.closing-line > span { font-size: 23px; }
.closing-line p { font-size: 14px; font-weight: 700; }
.closing-line a { margin-left: auto; font-size: 11px; }
.closing-line a span { margin-left: 10px; }
.site-footer { min-height: 87px; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 22px; }
.footer-brand { font-size: 19px; }
.site-footer > p { font-size: 10px; color: var(--muted); }
.site-footer > span { margin-left: auto; font-family: Arial, sans-serif; font-size: 8px; color: var(--muted); letter-spacing: 1px; }
.error-page { display: grid; place-items: center; min-height: 100svh; padding: 32px; text-align: center; }
.error-page h1 { font-family: Arial, sans-serif; font-size: 100px; letter-spacing: -5px; line-height: 1.2; }
.error-page p { line-height: 1.9; margin: 20px 0 28px; }

@media (min-width: 1440px) { .hero { padding-top: 91px; padding-bottom: 97px; } }
@media (max-width: 1000px) {
  .page-shell { padding: 0 32px; }
  .site-header { gap: 24px; }
  .site-header nav { gap: 20px; }
  .hero { gap: 26px; padding: 56px 0; }
  h1 { font-size: 36px; letter-spacing: -2px; }
  .hero-description { font-size: 12px; }
  .card-body { padding: 16px 18px; }
  .card-body > p { font-size: 51px; margin: 12px 0 16px; }
  .art-star { font-size: 61px; bottom: 11%; }
  .about { grid-template-columns: 1fr 1.2fr; gap: 24px; }
  .about-stamp { display: none; }
  .playground { padding: 32px; gap: 25px; grid-template-columns: 1fr 1.2fr; }
  .hello-test { flex-direction: column; align-items: flex-start; gap: 12px; }
  .contact { gap: 35px; grid-template-columns: .75fr 1.3fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
}
@media (max-width: 700px) {
  .page-shell { padding: 0 22px; }
  .site-header { min-height: 81px; gap: 15px; }
  .brand { font-size: 23px; }
  .brand-symbol { width: 30px; height: 30px; font-size: 25px; }
  .site-header nav { gap: 14px; }
  .site-header nav a:first-child { display: none; }
  .site-header nav a { font-size: 10px; }
  .demo-label { display: none; }
  .hero { grid-template-columns: 1fr; gap: 37px; padding: 44px 0; }
  .eyebrow { font-size: 8px; margin-bottom: 20px; }
  h1 { font-size: clamp(31px, 7.7vw, 50px); letter-spacing: -1.8px; line-height: 1.65; }
  .hero-description { font-size: 13px; margin: 20px 0 23px; }
  .hero-footnote { margin-top: 24px; font-size: 7px; }
  .art-stage { max-width: 460px; margin: 0 auto; aspect-ratio: 1.14; }
  .card-body > p { font-size: clamp(43px, 13vw, 66px); }
  .art-star { bottom: 10%; font-size: 70px; }
  .art-corner { left: 22px; top: 22px; font-size: 7px; }
  .art-note { right: 17px; }
  .about { padding: 35px 0; grid-template-columns: 1fr; gap: 20px; }
  h2 { font-size: 25px; }
  .about-copy { font-size: 12px; }
  .playground { grid-template-columns: 1fr; padding: 28px 24px; gap: 27px; margin-top: 9px; }
  .hello-test { flex-direction: row; align-items: center; gap: 16px; }
  .button-dark { min-width: 131px; gap: 20px; }
  .hello-response { font-size: 10px; }
  .contact { grid-template-columns: 1fr; gap: 25px; margin-top: 37px; padding-top: 33px; }
  .contact-flower { display: none; }
  .contact-intro .contact-note { max-width: none; margin: 14px 0 0; }
  .form-field input, .form-field textarea { font-size: 16px; }
  .contact-actions { align-items: flex-start; flex-direction: column; gap: 10px; }
  .closing-line { margin: 29px 0 34px; gap: 9px; flex-wrap: wrap; }
  .closing-line p { font-size: 12px; }
  .closing-line a { font-size: 10px; }
  .site-footer { min-height: 106px; flex-wrap: wrap; gap: 7px 14px; align-content: center; }
  .site-footer > p { margin: 0; }
  .site-footer > span { width: 100%; margin: 5px 0 0; font-size: 7px; }
}
@media (max-width: 360px) {
  .page-shell { padding: 0 18px; }
  .hello-test { flex-direction: column; align-items: flex-start; }
  .closing-line a { width: 100%; margin-left: 32px; }
  .art-star { font-size: 50px; }
  .card-body { padding: 13px 15px; }
  .card-kicker, .card-caption { font-size: 5px; }
  .site-header nav a:nth-child(2) { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}