:root {
  color-scheme: dark;
  --ground: #07111f;
  --surface: #0d1c31;
  --surface-soft: #10233b;
  --line: #29415d;
  --text: #f4f8fc;
  --muted: #c0cedc;
  --sky: #79cfff;
  --blue: #225bbc;
  --red: #e89aa4;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; }
section[id], main[id] { scroll-margin-top: 24px; }
h1, h2, h3 { text-wrap: balance; }
body { margin: 0; background: var(--ground); color: var(--text); font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif; font-size: 16px; line-height: 1.55; }
a { color: inherit; text-decoration: none; text-underline-offset: .22em; }
button { font: inherit; }
a, button, summary { touch-action: manipulation; }
button, .button { -webkit-user-select: none; user-select: none; }
::selection { background: #85d6ff; color: #07111f; }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 4px; }
.skip-link { position: absolute; z-index: 100; top: -100px; left: 16px; padding: 12px 16px; background: var(--sky); color: var(--ground); }
.skip-link:focus { top: 16px; }
.page-shell { min-width: 320px; overflow: clip; }
.wrap { width: min(100% - 48px, 1240px); margin-inline: auto; }

.site-header { min-height: 104px; padding-top: env(safe-area-inset-top, 0px); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 13px; min-height: 44px; font-weight: 600; letter-spacing: -.02em; white-space: nowrap; }
.brand-mark { width: 15px; height: 15px; border-radius: 50%; background: #38bdf8; flex: none; }
.site-header nav { display: flex; align-items: center; gap: clamp(18px, 3vw, 44px); font-size: 14px; color: var(--muted); }
.site-header nav a { display: inline-flex; align-items: center; min-height: 44px; }
.site-header nav a:hover, .site-footer a:hover, .text-link:hover { color: var(--sky); }
.header-app-link { color: var(--text); }
.header-app-link span { margin-left: 6px; }

.hero { min-height: min(880px, calc(100svh - 104px)); display: grid; grid-template-columns: minmax(0, .94fr) minmax(0, 1.06fr); align-items: center; gap: clamp(40px, 5vw, 94px); padding-block: 76px 124px; }
.hero-copy { padding-bottom: 8px; }
.hero h1 { max-width: 720px; margin: 0 0 30px; font-size: clamp(52px, 5.3vw, 82px); line-height: 1.035; letter-spacing: -.038em; font-weight: 350; }
.hero h1 em { color: var(--sky); font-style: normal; }
.hero-lead { max-width: 550px; margin: 0; font-size: clamp(18px, 1.5vw, 21px); line-height: 1.55; color: var(--muted); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; margin-top: 36px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 24px; min-height: 60px; padding: 15px 24px; border-radius: 14px; font-size: 16px; font-weight: 600; line-height: 1.2; transition: background-color .14s ease-out, border-color .14s ease-out; }
.button-primary { background: var(--blue); color: white; border: 1px solid #5a9ae8; }
.button-primary:hover { background: #2e6cce; }
.button-primary:active { background: #184995; }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: 15px; color: var(--muted); text-decoration: underline; text-decoration-color: #517492; }
.hero-note { margin: 14px 0 0; color: #a9bacd; font-size: 13px; }

.route-panel { padding: clamp(24px, 3vw, 40px); background: var(--surface); border: 1px solid var(--line); border-radius: 20px; }
.route-topline { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.route-topline h2 { margin: 0; font-size: 19px; font-weight: 600; letter-spacing: -.02em; }
.route-topline span { color: #abc0d3; font-size: 12px; text-align: right; }
.route-days { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; }
.route-days button { width: 100%; aspect-ratio: 1; min-width: 0; min-height: 44px; border: 1px solid #496482; border-radius: 11px; background: #172c45; color: #d7e5f1; cursor: pointer; font-size: 15px; font-variant-numeric: tabular-nums; transition: background-color .14s ease-out, border-color .14s ease-out, color .14s ease-out; }
.route-days button:hover { background: #24415e; }
.route-days button[aria-pressed="true"] { background: #a7dcf8; border-color: #a7dcf8; color: #081726; font-weight: 700; }
.route-days button:active { background: #91c9e8; }
.route-detail { min-height: 168px; margin-top: 22px; padding: 21px 22px; border-radius: 13px; background: #0a1728; }
.route-detail > span { display: block; color: var(--sky); font-size: 13px; font-weight: 600; margin-bottom: 7px; }
.route-detail h3 { margin: 0 0 7px; font-size: clamp(18px, 1.8vw, 22px); line-height: 1.25; font-weight: 600; }
.route-detail p { max-width: 48ch; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }
.route-hint { margin: 15px 0 0; color: #9eb0c3; font-size: 12px; }

.band { background: #0b192a; border-block: 1px solid #193149; }
.principle { padding-block: clamp(76px, 9vw, 132px); }
.principle-grid { display: grid; grid-template-columns: 1fr .7fr; align-items: end; gap: 8vw; }
.principle h2 { margin: 0; font-size: clamp(38px, 4.5vw, 64px); font-weight: 350; line-height: 1.1; letter-spacing: -.035em; }
.principle h2 span { color: var(--sky); }
.principle p { max-width: 490px; margin: 0 0 5px; font-size: 19px; line-height: 1.65; color: var(--muted); }
.section-space { padding-block: clamp(100px, 12vw, 170px); }
.section-intro { display: flex; justify-content: space-between; gap: 6vw; align-items: end; margin-bottom: clamp(60px, 8vw, 110px); }
.section-intro h2 { max-width: 730px; margin: 0; font-size: clamp(38px, 4.4vw, 62px); font-weight: 350; line-height: 1.1; letter-spacing: -.035em; }
.section-intro p { max-width: 340px; margin: 0 0 6px; color: var(--muted); font-size: 18px; }
.method-row { display: grid; grid-template-columns: minmax(0, .87fr) minmax(0, 1.13fr); gap: clamp(36px, 8vw, 120px); align-items: center; padding-block: clamp(48px, 6vw, 88px); border-top: 1px solid var(--line); }
.method-row:last-child { border-bottom: 1px solid var(--line); }
.method-b .method-description { order: 2; }
.method-b .method-visual { order: 1; }
.method-index { display: block; margin-bottom: 18px; color: var(--sky); font-size: 14px; font-weight: 600; }
.method-description h3 { max-width: 550px; margin: 0 0 18px; font-size: clamp(32px, 3.2vw, 48px); font-weight: 400; line-height: 1.12; letter-spacing: -.03em; }
.method-description p { max-width: 510px; margin: 0; color: var(--muted); font-size: 18px; line-height: 1.65; }
.inline-steps { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; list-style: none; padding: 0; margin: 28px 0 0; font-size: 13px; color: #c9def0; }
.inline-steps li { display: flex; align-items: center; gap: 10px; }
.inline-steps li + li::before { content: "→"; color: var(--sky); }
.method-visual { margin: 0; min-height: 340px; border-radius: 16px; overflow: hidden; background: var(--surface-soft); }
.breath-visual { padding: 42px; display: flex; flex-direction: column; justify-content: center; gap: 35px; }
.breath-track { position: relative; height: 1px; background: #7894ad; }
.breath-track::before, .breath-track::after { content: ""; position: absolute; top: -5px; width: 11px; height: 11px; border: 1px solid #8cb2d1; border-radius: 50%; background: var(--surface-soft); }
.breath-track::before { left: 0; } .breath-track::after { right: 0; }
.breath-point { position: absolute; left: 45%; top: 50%; width: 58px; height: 58px; border-radius: 50%; transform: translate(-50%, -50%); background: #c3eaff; border: 13px solid #5897be; }
.visual-caption { display: flex; justify-content: space-between; color: #c8d9e9; font-size: 14px; }
.photo-visual { position: relative; }
.photo-visual img { display: block; width: 100%; height: 100%; min-height: 340px; object-fit: cover; object-position: center; }
.photo-visual figcaption { position: absolute; left: 12px; right: 12px; bottom: 12px; padding: 10px 14px; border-radius: 8px; background: #07111f; color: #eff8ff; font-size: 13px; }

.observation { padding-block: clamp(90px, 11vw, 154px); }
.observation-grid { display: grid; grid-template-columns: 1fr .72fr; align-items: center; gap: 10vw; }
.observation h2 { max-width: 680px; margin: 0 0 28px; font-size: clamp(38px, 4.5vw, 62px); line-height: 1.1; letter-spacing: -.035em; font-weight: 350; }
.observation p { max-width: 610px; margin: 0 0 17px; color: var(--muted); font-size: 18px; line-height: 1.65; }
.example { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: clamp(24px, 4vw, 48px); }
.example > span { display: block; color: #aac0d3; font-size: 13px; margin-bottom: 32px; }
.example strong { display: block; font-size: 22px; font-weight: 500; }
.example-values { display: flex; align-items: baseline; justify-content: space-between; gap: 15px; font-variant-numeric: tabular-nums; font-size: clamp(72px, 8vw, 118px); line-height: 1.1; font-weight: 350; letter-spacing: -.04em; }
.example-values span:nth-child(2) { font-size: .4em; color: var(--sky); }
.example-legend { display: flex; justify-content: space-between; gap: 20px; color: #b9cadb; font-size: 13px; }
.sos { display: grid; grid-template-columns: 82px minmax(0, 1fr) auto; align-items: center; gap: 36px; }
.sos-marker { width: 82px; height: 82px; display: grid; place-items: center; border-radius: 50%; border: 1px solid #b5737c; color: #ffc6cf; font-size: 18px; font-weight: 700; }
.sos h2 { margin: 0 0 12px; font-size: clamp(32px, 3.3vw, 46px); font-weight: 400; line-height: 1.15; letter-spacing: -.03em; }
.sos p { max-width: 600px; margin: 0; color: var(--muted); font-size: 17px; }
.sos .text-link { white-space: nowrap; }
.questions { padding-block: clamp(80px, 10vw, 135px); }
.questions-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 9vw; }
.questions h2 { margin: 0; font-size: clamp(36px, 4vw, 56px); font-weight: 350; letter-spacing: -.035em; }
.questions details { border-top: 1px solid var(--line); }
.questions details:last-child { border-bottom: 1px solid var(--line); }
.questions summary { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; list-style: none; font-size: 19px; font-weight: 500; }
.questions summary::-webkit-details-marker { display: none; }
.questions summary::after { content: "+"; font-size: 27px; font-weight: 300; color: var(--sky); flex: none; }
.questions details[open] summary::after { content: "−"; }
.questions details p { max-width: 67ch; margin: -2px 0 25px; color: var(--muted); font-size: 16px; line-height: 1.65; }
.closing { padding-block: clamp(100px, 13vw, 180px); text-align: center; display: flex; flex-direction: column; align-items: center; }
.closing h2 { margin: 0; font-size: clamp(43px, 5.4vw, 76px); line-height: 1.07; font-weight: 350; letter-spacing: -.038em; }
.closing p { max-width: 570px; margin: 24px 0 36px; color: var(--muted); font-size: 19px; }
.closing > span { color: #a9bacd; font-size: 13px; margin-top: 16px; }
.site-footer { border-top: 1px solid var(--line); padding-block: 29px calc(29px + env(safe-area-inset-bottom, 0px)); display: grid; grid-template-columns: 1fr 2fr auto; gap: 24px; align-items: start; font-size: 13px; color: #a9bacd; }
.site-footer p { margin: 0; max-width: 580px; }
.site-footer a { color: var(--text); }

@media (max-width: 950px) {
  .hero { grid-template-columns: 1fr; min-height: 0; gap: 52px; padding-block: 80px 100px; }
  .hero h1 { max-width: 750px; }
  .route-panel { max-width: 730px; }
  .section-intro, .principle-grid, .observation-grid { grid-template-columns: 1fr; gap: 28px; }
  .section-intro { display: block; }
  .section-intro p { max-width: 650px; margin-top: 18px; }
  .method-row { gap: 38px; }
  .questions-grid { gap: 40px; }
}

@media (max-width: 640px) {
  .wrap { width: min(100% - 32px, 1240px); }
  .site-header { min-height: 76px; }
  .brand { font-size: 14px; gap: 8px; }
  .brand-mark { width: 11px; height: 11px; }
  .site-header nav a:first-child { display: none; }
  .site-header nav { font-size: 13px; }
  .hero { padding-block: 54px 90px; gap: 46px; }
  .hero h1 { font-size: clamp(43px, 11vw, 61px); margin-bottom: 23px; }
  .hero-lead { font-size: 17px; }
  .hero-actions { display: block; margin-top: 28px; }
  .hero-actions .button { width: 100%; justify-content: space-between; }
  .hero-actions .text-link { margin-top: 15px; }
  .route-panel { padding: 20px 14px; border-radius: 16px; }
  .route-days { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .route-topline { display: block; margin-bottom: 18px; }
  .route-topline h2 { font-size: 18px; }
  .route-topline span { display: block; text-align: left; margin-top: 3px; }
  .route-days { gap: 5px; }
  .route-days button { min-height: 44px; border-radius: 8px; font-size: 13px; }
  .route-detail { min-height: 165px; padding: 19px 17px; }
  .principle { padding-block: 75px; }
  .principle h2 { font-size: clamp(37px, 9vw, 52px); }
  .principle p, .method-description p, .observation p { font-size: 16px; }
  .section-space { padding-block: 88px; }
  .section-intro { margin-bottom: 52px; }
  .section-intro h2, .observation h2 { font-size: clamp(37px, 9vw, 50px); }
  .section-intro p { font-size: 16px; }
  .method-row { grid-template-columns: 1fr; gap: 28px; padding-block: 42px; }
  .method-b .method-description, .method-b .method-visual { order: initial; }
  .method-description h3 { font-size: 33px; }
  .method-visual, .photo-visual img { min-height: 235px; }
  .breath-visual { padding: 30px; }
  .observation { padding-block: 83px; }
  .observation-grid { gap: 28px; }
  .example-values { font-size: clamp(65px, 18vw, 95px); }
  .sos { grid-template-columns: 58px 1fr; align-items: start; gap: 18px; }
  .sos-marker { width: 58px; height: 58px; font-size: 13px; }
  .sos h2 { font-size: 31px; }
  .sos p { font-size: 16px; }
  .sos .text-link { grid-column: 2; }
  .questions { padding-block: 82px; }
  .questions-grid { grid-template-columns: 1fr; gap: 26px; }
  .questions summary { font-size: 17px; min-height: 78px; }
  .closing h2 { font-size: clamp(42px, 10vw, 60px); }
  .closing p { font-size: 17px; }
  .closing .button { width: 100%; justify-content: space-between; }
  .site-footer { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 374px) {
  .route-days { gap: 3px; }
  .brand-name { max-width: 155px; overflow: hidden; text-overflow: ellipsis; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}