:root {
  --ink: #102b3b;
  --muted: #536873;
  --green: #117864;
  --green-dark: #082f29;
  --green-soft: #e9f4f0;
  --blue-soft: #edf4f7;
  --surface: #f7faf9;
  --white: #fff;
  --line: #d8e5e1;
  --warning: #996515;
  --radius: 18px;
  --shadow: 0 22px 60px rgba(11, 48, 42, .10);
  --font: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: var(--font); line-height: 1.75; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -.025em; }
h1 { font-size: clamp(2.5rem, 5.6vw, 4.8rem); margin-bottom: 28px; }
h2 { font-size: clamp(2rem, 4vw, 3.2rem); margin-bottom: 20px; }
h3 { font-size: 1.2rem; margin-bottom: 10px; }
p { color: var(--muted); }

.container { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 2000; padding: 10px 16px; background: var(--white); color: var(--ink); }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.92); border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--green-dark); font-weight: 900; font-size: 1.2rem; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 11px; background: var(--green); color: var(--white); }
.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav a { text-decoration: none; color: #425860; font-size: .9rem; font-weight: 700; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--green); }
.site-nav .nav-cta { padding: 10px 18px; border-radius: 8px; background: var(--green); color: var(--white); }
.menu-button { display: none; padding: 9px 12px; border: 1px solid var(--line); background: var(--white); border-radius: 8px; color: var(--ink); font: inherit; font-weight: 700; }

.hero { min-height: calc(100svh - 76px); display: grid; align-items: center; padding: 92px 0; background: linear-gradient(145deg, #f5faf8 0%, #eef5f6 54%, #fff 100%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: 72px; }
.eyebrow { margin-bottom: 14px; color: var(--green); text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; font-weight: 900; }
.eyebrow.light { color: #9ce1cf; }
.hero-lead { max-width: 680px; margin-bottom: 34px; font-size: 1.12rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 12px 22px; border-radius: 9px; border: 1px solid transparent; text-decoration: none; font-weight: 800; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--green); color: var(--white); }
.button-secondary { border-color: #b9cbc6; color: var(--ink); background: rgba(255,255,255,.6); }
.button-white { background: var(--white); color: var(--green-dark); }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 22px; padding: 0; margin: 0; list-style: none; color: #3d5a62; font-size: .88rem; font-weight: 700; }
.hero-points li::before { content: "✓"; margin-right: 7px; color: var(--green); }
.patent-badge { width: fit-content; display: inline-flex; align-items: center; gap: 10px; margin: 22px 0 0; padding: 8px 14px; border: 1px solid rgba(17,120,100,.25); border-radius: 999px; color: var(--green-dark); background: rgba(255,255,255,.72); font-size: .78rem; font-weight: 700; line-height: 1.4; box-shadow: 0 8px 22px rgba(11,48,42,.06); }
.patent-badge strong { color: var(--green); font-size: .92rem; }
.patent-divider { color: #9cb4ad; }

.hero-art { position: relative; margin: 0; border: 1px solid rgba(17,120,100,.15); border-radius: 28px; background: var(--white); box-shadow: var(--shadow); transform: rotate(1deg); overflow: hidden; }
.hero-art::after { content: ""; position: absolute; inset: auto 0 0; height: 34%; background: linear-gradient(transparent, rgba(4,29,25,.18)); pointer-events: none; }
.hero-art img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
.hero-art figcaption { position: absolute; z-index: 2; left: 20px; right: 20px; bottom: 16px; color: var(--white); font-size: .74rem; font-weight: 800; text-shadow: 0 1px 4px rgba(0,0,0,.35); }
.product-preview { padding: 18px; border: 1px solid rgba(17,120,100,.15); border-radius: 24px; background: rgba(255,255,255,.8); box-shadow: var(--shadow); transform: rotate(1deg); }
.preview-top { height: 42px; display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: .72rem; }
.preview-top span { width: 8px; height: 8px; border-radius: 50%; background: #bed1cc; }
.preview-top strong { margin-left: 10px; }
.preview-body { display: grid; grid-template-columns: 1.45fr .75fr; gap: 12px; }
.preview-map { position: relative; min-height: 350px; padding: 20px; overflow: hidden; border-radius: 14px; background: linear-gradient(30deg, transparent 48%, rgba(17,120,100,.12) 49%, rgba(17,120,100,.12) 51%, transparent 52%), linear-gradient(120deg, #dcebe7, #eff5f3); }
.preview-map::after { content: ""; position: absolute; inset: 25% -10% auto 18%; height: 5px; background: rgba(255,255,255,.9); transform: rotate(-19deg); box-shadow: 40px 90px 0 rgba(255,255,255,.85), -50px 165px 0 rgba(255,255,255,.75); }
.preview-map p { position: relative; z-index: 2; margin: 0; color: var(--green-dark); font-weight: 800; }
.map-pin { position: absolute; z-index: 3; width: 42px; height: 42px; display: grid; place-items: center; border: 4px solid var(--white); border-radius: 50%; color: var(--white); background: var(--green); font-size: .72rem; font-weight: 900; box-shadow: 0 8px 16px rgba(0,0,0,.14); }
.pin-a { top: 28%; left: 20%; }.pin-b { top: 50%; right: 22%; }.pin-c { bottom: 18%; left: 43%; }
.preview-panel { display: grid; gap: 10px; }
.preview-panel p { display: flex; flex-direction: column; justify-content: center; margin: 0; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); }
.preview-panel strong { color: var(--green); font-size: .76rem; }.preview-panel span { color: var(--ink); font-size: 1.25rem; font-weight: 900; }
.preview-note { margin: 12px 3px 0; font-size: .72rem; }

.section { padding: 112px 0; }
.section-tint { background: var(--surface); border-block: 1px solid #edf2f0; }
.section-heading { max-width: 760px; margin-bottom: 56px; }
.section-heading > p:last-child { max-width: 650px; margin-bottom: 0; }
.lessons-section { background: var(--white); }
.lessons-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 86px; align-items: start; }
.lessons-intro { position: sticky; top: 118px; }
.lessons-intro > p:not(.eyebrow) { max-width: 500px; }
.lesson-summary { margin-top: 42px; padding: 24px; border-left: 4px solid var(--green); background: var(--green-soft); }
.lesson-summary span { display: block; margin-bottom: 6px; color: var(--green); font-size: .75rem; font-weight: 900; letter-spacing: .08em; }
.lesson-summary strong { display: block; color: var(--green-dark); font-size: 1.05rem; }
.lesson-list { position: relative; display: grid; gap: 0; padding: 0; margin: 0; list-style: none; }
.lesson-list::before { content: ""; position: absolute; left: 25px; top: 30px; bottom: 30px; width: 1px; background: var(--line); }
.lesson-list li { position: relative; display: grid; grid-template-columns: 52px 1fr; gap: 22px; padding: 25px 0; border-bottom: 1px solid var(--line); border-radius: 14px; cursor: default; transition: margin .25s ease, padding .25s ease, background-color .25s ease, box-shadow .25s ease; }
.lesson-list li:first-child { padding-top: 0; }
.lesson-list li:last-child { border-bottom: 0; }
.lesson-number { position: relative; z-index: 2; width: 52px; height: 52px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--green); background: var(--white); font-size: .72rem; font-weight: 900; }
.lesson-list h3 { margin: 2px 0 8px; }
.lesson-list p { margin: 0; font-size: .9rem; }
.lesson-list li:hover,
.lesson-list li:focus,
.lesson-list li:focus-visible,
.lesson-list li:focus-within { margin: 8px -20px; padding: 25px 20px; border-bottom-color: transparent; color: var(--white); background: var(--green-dark); box-shadow: 0 16px 34px rgba(8,47,41,.16); outline: 0; }
.lesson-list li:hover .lesson-number,
.lesson-list li:focus .lesson-number,
.lesson-list li:focus-visible .lesson-number,
.lesson-list li:focus-within .lesson-number { border-color: rgba(255,255,255,.22); color: var(--green-dark); background: #aee4d6; }
.lesson-list li:hover h3,
.lesson-list li:focus h3,
.lesson-list li:focus-visible h3,
.lesson-list li:focus-within h3 { color: var(--white); }
.lesson-list li:hover p,
.lesson-list li:focus p,
.lesson-list li:focus-visible p,
.lesson-list li:focus-within p { color: #c6ddd7; }
.lesson-list li:focus-visible { box-shadow: 0 0 0 3px #f0b429, 0 16px 34px rgba(8,47,41,.16); }
.source-note { margin-top: 52px; padding-top: 22px; border-top: 1px solid var(--line); }
.source-note p { margin: 0; color: #778a92; font-size: .74rem; }
.solutions-section { border-top: 1px solid #edf2f0; }
.solutions-section .section-heading,
#features .section-heading { max-width: 940px; }
.solutions-section .section-heading > p:last-child,
#features .section-heading > p:last-child { max-width: 940px; }
.solutions-lead { max-width: 940px; margin: -26px 0 42px; }
.solution-labels { display: grid; grid-template-columns: .72fr 1.45fr .83fr; gap: 0; padding: 0 24px 12px; color: #789087; font-size: 1.05rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.solution-matrix { overflow: hidden; border: 1px solid var(--line); border-radius: 20px; background: var(--white); box-shadow: 0 18px 44px rgba(11,48,42,.06); }
.solution-row { display: grid; grid-template-columns: .72fr 1.45fr .83fr; min-height: 210px; border-bottom: 1px solid var(--line); transition: color .25s ease, background-color .25s ease, box-shadow .25s ease; }
.solution-row:last-child { border-bottom: 0; }
.solution-row > div { padding: 30px; }
.solution-row > div + div { border-left: 1px solid var(--line); }
.solution-problem { background: #f9eeee; }
.solution-index { display: block; margin-bottom: 30px; color: #ac5c5c; font-size: .72rem; font-weight: 900; }
.solution-problem h3 { color: #863c3c; }
.solution-function { display: flex; gap: 20px; }
.solution-icon { flex: 0 0 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; color: var(--white); background: var(--green); font-size: 1.35rem; font-weight: 900; }
.solution-function h3 { color: var(--green-dark); }
.solution-function p { margin-bottom: 0; font-size: .87rem; }
.solution-function .function-note { margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--line); color: #758990; font-size: .73rem; }
.solution-effect { background: #f2f7f5; }
.solution-effect ul { display: grid; gap: 11px; padding: 0; margin: 0; list-style: none; }
.solution-effect li { position: relative; padding-left: 22px; color: #425b62; font-size: .84rem; font-weight: 700; }
.solution-effect li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 900; }
.solution-row:hover,
.solution-row:focus,
.solution-row:focus-visible,
.solution-row:focus-within { position: relative; z-index: 2; color: var(--white); background: var(--green-dark); box-shadow: 0 18px 38px rgba(8,47,41,.20); outline: 0; }
.solution-row:hover > div,
.solution-row:focus > div,
.solution-row:focus-visible > div,
.solution-row:focus-within > div { border-color: rgba(255,255,255,.13); background: transparent; }
.solution-row:hover .solution-index,
.solution-row:focus .solution-index,
.solution-row:focus-visible .solution-index,
.solution-row:focus-within .solution-index { color: #9ce1cf; }
.solution-row:hover h3,
.solution-row:focus h3,
.solution-row:focus-visible h3,
.solution-row:focus-within h3 { color: var(--white); }
.solution-row:hover p,
.solution-row:focus p,
.solution-row:focus-visible p,
.solution-row:focus-within p,
.solution-row:hover .solution-effect li,
.solution-row:focus .solution-effect li,
.solution-row:focus-visible .solution-effect li,
.solution-row:focus-within .solution-effect li { color: #c6ddd7; }
.solution-row:hover .solution-icon,
.solution-row:focus .solution-icon,
.solution-row:focus-visible .solution-icon,
.solution-row:focus-within .solution-icon { color: var(--green-dark); background: #aee4d6; }
.solution-row:hover .function-note,
.solution-row:focus .function-note,
.solution-row:focus-visible .function-note,
.solution-row:focus-within .function-note { border-color: rgba(255,255,255,.18); color: #a9c8c0; }
.solution-row:focus-visible { box-shadow: 0 0 0 3px #f0b429, 0 18px 38px rgba(8,47,41,.20); }
.solution-principle { display: flex; gap: 18px; align-items: flex-start; margin-top: 34px; padding: 26px 30px; border-radius: 14px; color: var(--white); background: var(--green-dark); }
.solution-principle > span { flex: 0 0 34px; height: 34px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.24); border-radius: 50%; color: #aee4d6; font-weight: 900; }
.solution-principle p { margin: 0; color: #c6ddd7; }
.solution-principle strong { color: var(--white); }
.problem-grid, .feature-list, .security-grid, .phase-grid { display: grid; gap: 24px; }
.problem-grid { grid-template-columns: repeat(3, 1fr); }
.problem-grid article { padding-top: 24px; border-top: 3px solid var(--green); }
.problem-grid article > span { display: block; margin-bottom: 28px; color: #8aa69f; font-size: .8rem; font-weight: 900; }

.workflow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; padding: 0; margin: 0; list-style: none; counter-reset: workflow; }
.workflow li { position: relative; display: flex; gap: 18px; padding: 30px 32px; border: 1px solid var(--line); background: var(--white); }
.workflow li + li { border-left: 0; }
.workflow li:first-child { border-radius: 16px 0 0 16px; }.workflow li:last-child { border-radius: 0 16px 16px 0; }
.workflow li > span { flex: 0 0 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--green); color: var(--white); font-weight: 900; }
.workflow p { margin-bottom: 0; font-size: .9rem; }
.workflow-art { position: relative; margin: 42px 0 0; border-radius: 22px; overflow: hidden; background: var(--white); box-shadow: 0 18px 45px rgba(11,48,42,.09); }
.workflow-art img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 7; object-fit: cover; }
.workflow-art figcaption { position: absolute; right: 16px; bottom: 14px; padding: 7px 11px; border-radius: 7px; color: var(--green-dark); background: rgba(255,255,255,.9); font-size: .72rem; font-weight: 900; backdrop-filter: blur(8px); }

.status-legend { display: flex; flex-wrap: wrap; gap: 12px 24px; margin: -28px 0 30px; color: var(--muted); font-size: .8rem; font-weight: 700; }
.status-legend span { display: inline-flex; align-items: center; gap: 7px; }.status-legend i { width: 9px; height: 9px; border-radius: 50%; }
.status-ready { background: var(--green); }.status-check { background: var(--warning); }.status-plan { background: #758792; }
.feature-list { grid-template-columns: repeat(3, 1fr); }
.feature-list article { min-height: 245px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.feature-list p { margin-bottom: 0; font-size: .9rem; }
.feature-qr { position: relative; overflow: hidden; }
.qr-motif { position: absolute; right: 22px; top: 22px; width: 52px; height: 52px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 3px; padding: 6px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); opacity: .82; }
.qr-motif i { border-radius: 1px; background: var(--green); }.qr-motif i:nth-child(2), .qr-motif i:nth-child(4), .qr-motif i:nth-child(9) { background: transparent; }
.status { display: inline-block; margin-bottom: 28px; padding: 4px 9px; border-radius: 100px; font-size: .7rem; font-weight: 900; }
.status.ready { color: #0a624f; background: #dff1eb; }.status.check { color: #85570b; background: #fff1ce; }.status.plan { color: #536873; background: #e9eef0; }

.customization-section { padding: 76px 0; border-top: 1px solid var(--line); background: linear-gradient(135deg, var(--green-soft), #f5faf8); }
.customization-inner { display: grid; grid-template-columns: .8fr 1.2fr; gap: 72px; align-items: start; }
.customization-inner h2 { margin-bottom: 0; font-size: clamp(1.8rem, 3.2vw, 2.65rem); }
.customization-content { padding-left: 28px; border-left: 3px solid var(--green); }
.customization-lead { margin: 0 0 28px; color: #3f5e61; font-size: 1rem; }
.customization-content h3 { margin-bottom: 14px; color: var(--green-dark); font-size: .9rem; }
.customization-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; padding: 0; margin: 0; list-style: none; }
.customization-list li { position: relative; padding-left: 22px; color: #38565a; font-size: .84rem; }
.customization-list li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 900; }
.customization-note { margin: 24px 0 0; color: #71858c; font-size: .72rem; }

.impact-section { color: var(--white); background: var(--green-dark); }
.impact-section h2 { color: var(--white); }.impact-section p { color: #bdd3cd; }
.impact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 100px; align-items: start; }
.impact-list { display: grid; gap: 0; }
.impact-list p { display: grid; grid-template-columns: 130px 1fr; gap: 28px; margin: 0; padding: 21px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.impact-list strong { color: var(--white); }

.security-grid { grid-template-columns: repeat(2, 1fr); }
.security-grid article { padding: 28px 0; border-top: 1px solid var(--line); }
.security-grid p { margin-bottom: 0; }
.hosting-note { display: grid; grid-template-columns: .85fr 1.15fr; gap: 48px; margin-top: 48px; padding: 34px; border-radius: var(--radius); background: var(--blue-soft); }
.hosting-note h3, .hosting-note p { margin-bottom: 0; }

.phase-grid { grid-template-columns: repeat(3, 1fr); }
.phase-grid article { padding: 28px; border-left: 3px solid var(--green); background: var(--white); }
.phase-grid span { display: block; margin-bottom: 30px; color: var(--green); font-size: .75rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.phase-grid p { margin-bottom: 0; }

.contact-section { padding: 80px 0; background: var(--green); }
.contact-layout { display: grid; grid-template-columns: .86fr 1.14fr; gap: 76px; align-items: start; }
.contact-copy { position: sticky; top: 116px; }
.contact-copy h2, .contact-copy p { color: var(--white); }.contact-copy > p:last-of-type { color: #d1e7e1; }
.contact-copy ul { display: grid; gap: 10px; padding: 0; margin: 32px 0 0; list-style: none; }
.contact-copy li { position: relative; padding-left: 24px; color: #d8ebe6; font-size: .88rem; }
.contact-copy li::before { content: "✓"; position: absolute; left: 0; color: #aee4d6; font-weight: 900; }
.contact-form { padding: 36px; border-radius: 20px; background: var(--white); box-shadow: 0 24px 64px rgba(3,25,21,.20); }
.form-field { margin-bottom: 22px; }
.form-field label { display: block; margin-bottom: 7px; color: var(--ink); font-size: .88rem; font-weight: 900; }
.form-field label span { color: #b33939; }
.form-field input, .form-field textarea { width: 100%; min-height: 50px; padding: 12px 14px; border: 1px solid #bdcec9; border-radius: 9px; color: var(--ink); background: #fbfdfc; font: inherit; font-size: .95rem; line-height: 1.5; transition: border-color .2s, box-shadow .2s, background .2s; }
.form-field textarea { min-height: 150px; resize: vertical; }
.form-field input::placeholder, .form-field textarea::placeholder { color: #87999f; }
.form-field input:hover, .form-field textarea:hover { border-color: #90aaa2; }
.form-field input:focus, .form-field textarea:focus { outline: 0; border-color: var(--green); background: var(--white); box-shadow: 0 0 0 4px rgba(17,120,100,.12); }
.field-help { margin: 5px 0 0; color: #778a92; font-size: .7rem; }
.privacy-check { display: flex; gap: 10px; align-items: flex-start; margin: 4px 0 22px; color: #536873; font-size: .8rem; cursor: pointer; }
.privacy-check input { flex: 0 0 auto; width: 18px; height: 18px; margin-top: 4px; accent-color: var(--green); }
.privacy-check a { color: var(--green); font-weight: 800; }
.contact-submit { width: 100%; border: 0; color: var(--white); background: var(--green-dark); cursor: pointer; }
.contact-submit:hover { background: #041f1b; }
.form-notice { margin: 12px 0 0; color: #71858c; font-size: .72rem; text-align: center; }
.form-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-status { margin: 16px 0 0; padding: 12px 14px; border-radius: 8px; font-size: .86rem; font-weight: 700; }
.form-status.is-success { color: #075844; background: #e0f3ec; }
.form-status.is-error { color: #8a2929; background: #fdeaea; }
.legal-section { padding: 72px 0; background: #f3f7f6; }
.legal-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 70px; }
.legal-grid h2 { font-size: 1.15rem; }.legal-grid p { margin-bottom: 0; font-size: .84rem; }

.site-footer { padding: 52px 0 80px; color: #c4d6d1; background: #061d19; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: start; }
.footer-inner strong { color: var(--white); font-size: 1.2rem; }.footer-inner p { margin: 6px 0 0; color: #8fa9a3; font-size: .82rem; }
.footer-links { display: flex; flex-direction: column; gap: 6px; color: #8fa9a3; font-size: .8rem; }.footer-links a { color: #d3e1dd; font-weight: 700; }
.footer-inner small { grid-column: 1 / -1; color: #718b85; }
.mobile-cta { display: none; }
.back-to-top { position: fixed; z-index: 850; right: 24px; bottom: 24px; display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 10px 16px; border: 1px solid rgba(17,120,100,.24); border-radius: 999px; color: var(--white); background: var(--green-dark); box-shadow: 0 12px 30px rgba(3,25,21,.22); text-decoration: none; font-size: .8rem; font-weight: 900; opacity: 0; visibility: hidden; transform: translateY(12px); pointer-events: none; transition: opacity .2s ease, visibility .2s ease, transform .2s ease, background-color .2s ease; }
.back-to-top:hover { background: var(--green); }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.back-to-top > span:first-child { font-size: 1.05rem; line-height: 1; }

:focus-visible { outline: 3px solid #f0b429; outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }

@media (max-width: 900px) {
  .menu-button { display: inline-flex; }
  .site-nav { display: none; position: absolute; inset: 76px 0 auto; padding: 20px 24px 28px; flex-direction: column; align-items: stretch; gap: 0; background: var(--white); border-bottom: 1px solid var(--line); box-shadow: 0 18px 28px rgba(0,0,0,.08); }
  .site-nav.is-open { display: flex; }.site-nav a { padding: 13px 8px; }.site-nav .nav-cta { margin-top: 8px; text-align: center; }
  .hero { min-height: auto; padding: 74px 0 82px; }.hero-grid { grid-template-columns: 1fr; gap: 52px; }
  .lessons-grid { grid-template-columns: 1fr; gap: 48px; }.lessons-intro { position: static; }.lessons-intro > p:not(.eyebrow) { max-width: 680px; }
  .solution-labels { display: none; }.solution-row { grid-template-columns: .72fr 1.45fr; }.solution-effect { grid-column: 1 / -1; }.solution-row > .solution-effect { border-left: 0; border-top: 1px solid var(--line); }.solution-effect ul { grid-template-columns: repeat(3, 1fr); }
  .product-preview, .hero-art { max-width: 680px; }
  .problem-grid, .feature-list, .phase-grid { grid-template-columns: repeat(2, 1fr); }
  .customization-inner { grid-template-columns: 1fr; gap: 28px; }
  .customization-content { max-width: 820px; }
  .workflow { grid-template-columns: 1fr; }.workflow li + li { border-left: 1px solid var(--line); border-top: 0; }.workflow li:first-child { border-radius: 16px 16px 0 0; }.workflow li:last-child { border-radius: 0 0 16px 16px; }
  .impact-grid, .hosting-note, .contact-layout { grid-template-columns: 1fr; gap: 42px; }.contact-copy { position: static; }.contact-copy > p:last-of-type { max-width: 680px; }
}

@media (max-width: 620px) {
  html { scroll-padding-top: 70px; }
  body { padding-bottom: 66px; }
  .container { width: min(100% - 36px, 1160px); }
  .header-inner { min-height: 68px; }.site-nav { inset: 68px 0 auto; }
  h1 { font-size: clamp(2.35rem, 12vw, 3.2rem); line-height: 1.24; }
  h2 { font-size: 2rem; }
  .hero { padding: 62px 0 68px; }.hero-lead { font-size: 1rem; }.cta-row { display: grid; }.button { width: 100%; }
  .patent-badge { display: flex; width: 100%; justify-content: center; gap: 7px; padding-inline: 10px; font-size: .74rem; }
  .hero-points { display: grid; gap: 8px; }
  .product-preview, .hero-art { border-radius: 16px; transform: none; }.preview-body { grid-template-columns: 1fr; }.preview-map { min-height: 245px; }.preview-panel { grid-template-columns: repeat(3, 1fr); }.preview-panel p { padding: 10px; }.preview-panel span { font-size: .95rem; }
  .hero-art figcaption { left: 14px; bottom: 12px; }.workflow-art { margin-top: 28px; border-radius: 14px; }.workflow-art img { aspect-ratio: 5 / 4; object-position: 40% center; }.workflow-art figcaption { left: 10px; right: auto; bottom: 10px; }
  .section { padding: 82px 0; }.section-heading { margin-bottom: 40px; }
  .customization-section { padding: 62px 0; }.customization-inner h2 br { display: none; }.customization-content { padding-left: 20px; }.customization-list { grid-template-columns: 1fr; }
  .lesson-summary { margin-top: 28px; }.lesson-list li { grid-template-columns: 46px 1fr; gap: 16px; }.lesson-list::before { left: 22px; }.lesson-number { width: 46px; height: 46px; }.lesson-list li:hover, .lesson-list li:focus, .lesson-list li:focus-visible, .lesson-list li:focus-within { margin-inline: -10px; padding-inline: 10px; }
  .solutions-lead { margin-top: -18px; }.solution-matrix { border-radius: 14px; }.solution-row { grid-template-columns: 1fr; }.solution-row > div { padding: 24px; }.solution-row > div + div { border-left: 0; border-top: 1px solid var(--line); }.solution-effect { grid-column: auto; }.solution-effect ul { grid-template-columns: 1fr; }.solution-index { margin-bottom: 12px; }.solution-function { gap: 14px; }.solution-principle { padding: 22px; }
  .problem-grid, .feature-list, .security-grid, .phase-grid, .legal-grid { grid-template-columns: 1fr; }
  .feature-list article { min-height: auto; }
  .impact-list p { grid-template-columns: 1fr; gap: 3px; }
  .hosting-note { padding: 26px; }
  .contact-section { padding: 64px 0; }
  .contact-form { padding: 24px 20px; border-radius: 14px; }.contact-copy ul { margin-top: 24px; }
  .footer-inner { grid-template-columns: 1fr; }.footer-links { flex-direction: column; gap: 10px; }.footer-inner small { grid-column: auto; }
  .back-to-top { right: 18px; bottom: calc(82px + env(safe-area-inset-bottom)); width: 46px; height: 46px; min-height: 46px; justify-content: center; padding: 0; }
  .back-to-top-label { display: none; }
  .mobile-cta { position: fixed; z-index: 900; inset: auto 0 0; display: grid; grid-template-columns: 1fr 1fr; padding: 9px 12px calc(9px + env(safe-area-inset-bottom)); gap: 8px; background: rgba(255,255,255,.96); border-top: 1px solid var(--line); }
  .mobile-cta a { min-height: 44px; display: grid; place-items: center; border-radius: 7px; text-decoration: none; font-size: .82rem; font-weight: 900; }.mobile-cta a:first-child { color: var(--white); background: var(--green); }.mobile-cta a:last-child { color: var(--green-dark); background: var(--green-soft); }
}