:root {
  --paper: #f3f5f0;
  --surface: #fefff9;
  --ink: #17241d;
  --muted: #68736b;
  --moss: #254b38;
  --moss-deep: #173326;
  --coral: #ef6a4b;
  --blush: #f5d7ce;
  --mist: #dce8e0;
  --line: rgba(23, 36, 29, 0.12);
  --shadow: 0 26px 80px rgba(28, 53, 39, 0.13);
  --display: "Songti SC", "Noto Serif CJK SC", "STSong", "SimSun", serif;
  --body: "Avenir Next", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --utility: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { background: var(--paper); scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: var(--body); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
:focus-visible { outline: 3px solid #a63e42; outline-offset: 4px; box-shadow: 0 0 0 2px var(--surface); }
::selection { background: var(--blush); color: var(--ink); }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 100; padding: 10px 15px; border-radius: 12px; background: var(--ink); color: #fff; transform: translateY(-160%); transition: transform 0.2s ease; }
.skip-link:focus { transform: translateY(0); }

.site-header { position: relative; z-index: 30; display: grid; width: min(calc(100% - 64px), var(--max)); min-height: 96px; margin: 0 auto; grid-template-columns: 1fr auto 1fr; align-items: center; }
.brand { display: inline-flex; width: max-content; align-items: center; gap: 11px; justify-self: start; }
.brand-mark, .mini-mark, .closing-mark { position: relative; display: inline-grid; flex: 0 0 auto; place-items: center; background: var(--moss); }
.brand-mark { width: 38px; height: 38px; border-radius: 13px; box-shadow: 0 8px 18px rgba(37, 75, 56, 0.16); transform: rotate(-3deg); }
.brand-mark::before, .brand-mark::after, .mini-mark::before, .mini-mark::after, .closing-mark::before, .closing-mark::after { position: absolute; top: 10px; width: 9px; height: 15px; border: 2px solid var(--blush); content: ""; }
.brand-mark::before, .mini-mark::before, .closing-mark::before { left: 8px; border-right: 0; border-radius: 12px 0 0 12px; }
.brand-mark::after, .mini-mark::after, .closing-mark::after { right: 8px; border-left: 0; border-radius: 0 12px 12px 0; }
.brand-mark i, .mini-mark i, .closing-mark i { z-index: 1; width: 5px; height: 5px; border-radius: 50%; background: var(--coral); }
.brand-name { display: grid; line-height: 1; }
.brand-name strong { font-family: var(--display); font-size: 22px; font-weight: 700; letter-spacing: 0.08em; }
.brand-name small { margin-top: 5px; color: var(--muted); font: 700 8px/1 var(--utility); letter-spacing: 0.22em; }
.site-nav { display: flex; align-items: center; gap: 28px; color: var(--muted); font-size: 13px; }
.site-nav a { position: relative; padding: 8px 0; transition: color 0.2s ease; }
.site-nav a::after { position: absolute; right: 0; bottom: 2px; left: 0; height: 1px; background: var(--coral); content: ""; transform: scaleX(0); transform-origin: left; transition: transform 0.22s ease; }
.site-nav a:hover, .site-nav a.is-current { color: var(--ink); }
.site-nav a:hover::after, .site-nav a.is-current::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 18px; justify-self: end; font-size: 13px; }
.login-link { color: var(--muted); }
.login-link:hover { color: var(--ink); }
.start-link { display: inline-flex; min-height: 42px; align-items: center; padding: 0 18px; border-radius: 14px; background: var(--ink); color: #fff; font-weight: 700; transition: background 0.2s ease, transform 0.2s ease; }
.start-link:hover { background: var(--moss); transform: translateY(-1px); }
.start-link.is-disabled,
.button.is-disabled { cursor: not-allowed; opacity: 0.58; pointer-events: none; transform: none; }
.nav-toggle { display: none; }

.assurance { display: flex; width: min(calc(100% - 64px), var(--max)); min-height: 50px; margin: 2px auto 22px; align-items: center; justify-content: space-between; padding: 0 18px; border: 1px solid rgba(37, 75, 56, 0.1); border-radius: 16px; background: rgba(220, 232, 224, 0.48); color: #506158; font-size: 12px; }
.assurance span { display: flex; align-items: center; gap: 9px; }
.assurance span i { width: 7px; height: 7px; border: 2px solid var(--moss); border-radius: 50%; box-shadow: 0 0 0 4px rgba(37, 75, 56, 0.08); }
.assurance a { color: var(--moss); font-weight: 700; }
.assurance a b { margin-left: 4px; font-weight: 400; }

.hero { position: relative; display: grid; width: min(calc(100% - 64px), var(--max)); min-height: 690px; margin: 0 auto; grid-template-columns: minmax(0, 1.06fr) minmax(390px, 0.94fr); gap: 72px; align-items: center; padding: 66px 0 86px; }
.hero::before { position: absolute; top: 9%; left: 47%; width: 1px; height: 68%; background: linear-gradient(transparent, rgba(23, 36, 29, 0.13) 22%, rgba(23, 36, 29, 0.13) 78%, transparent); content: ""; }
.hero-copy { position: relative; z-index: 2; }
.eyebrow, .section-label { display: inline-flex; width: max-content; align-items: center; color: var(--moss); font: 700 10px/1.2 var(--utility); letter-spacing: 0.14em; text-transform: uppercase; }
.eyebrow::before, .section-label::before { width: 24px; height: 1px; margin-right: 10px; background: var(--coral); content: ""; }
.hero h1 { margin: 25px 0 25px; font-family: var(--display); font-size: clamp(66px, 7.2vw, 96px); font-weight: 700; line-height: 0.98; letter-spacing: -0.085em; }
.hero h1 span { display: block; width: max-content; }
.hero h1 .hero-love { position: relative; margin-top: 11px; margin-left: 0.72em; }
.hero-love i { position: absolute; right: -0.34em; bottom: -0.04em; color: var(--coral); font-family: var(--body); font-size: 0.78em; font-style: normal; }
.hero-lede { max-width: 600px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.85; text-wrap: pretty; }
.hero-actions { display: flex; margin-top: 33px; align-items: center; gap: 23px; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; gap: 18px; padding: 0 23px; border-radius: 15px; font-size: 13px; font-weight: 750; transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--ink); color: #fff; box-shadow: 0 12px 26px rgba(23, 36, 29, 0.15); }
.button.primary:hover { background: var(--moss); box-shadow: 0 15px 30px rgba(37, 75, 56, 0.2); }
.button.light { background: var(--surface); color: var(--moss-deep); }
.button span { font-size: 17px; font-weight: 400; }
.text-link { position: relative; color: var(--moss); font-size: 13px; font-weight: 700; }
.text-link::after { position: absolute; right: 0; bottom: -3px; left: 0; height: 1px; background: currentColor; content: ""; transform-origin: right; transition: transform 0.2s ease; }
.text-link:hover::after { transform: scaleX(0.3); }
.hero-proof { display: flex; margin: 42px 0 0; padding: 0; list-style: none; }
.hero-proof li { display: grid; min-width: 132px; gap: 3px; padding-right: 20px; }
.hero-proof li + li { padding-left: 20px; border-left: 1px solid var(--line); }
.hero-proof strong { font-size: 12px; }
.hero-proof span { color: var(--muted); font-size: 10px; }

.echo-window { position: relative; min-height: 600px; margin: 0; padding: 25px 26px 23px; border: 1px solid rgba(23, 36, 29, 0.09); border-radius: 34px; background: rgba(254, 255, 249, 0.9); box-shadow: var(--shadow); transform: rotate(1deg); overflow: hidden; }
.echo-window::after { position: absolute; right: -34px; bottom: -116px; color: rgba(37, 75, 56, 0.045); content: "我"; font-family: var(--display); font-size: 280px; line-height: 1; pointer-events: none; }
.echo-window figcaption { display: flex; position: relative; z-index: 2; align-items: center; justify-content: space-between; padding-bottom: 19px; border-bottom: 1px solid var(--line); }
.echo-window figcaption span { color: var(--muted); font: 600 9px/1 var(--utility); letter-spacing: 0.08em; }
.echo-window figcaption strong { font-size: 11px; font-weight: 700; }
.echo-identity { display: grid; position: relative; z-index: 2; margin-top: 23px; grid-template-columns: 34px 1fr auto; gap: 10px; align-items: center; }
.mini-mark { width: 34px; height: 34px; border-radius: 12px; }
.mini-mark::before, .mini-mark::after { top: 9px; width: 8px; height: 13px; }
.mini-mark::before { left: 7px; }.mini-mark::after { right: 7px; }
.echo-identity p { display: grid; gap: 2px; margin: 0; line-height: 1.2; }
.echo-identity strong { font-family: var(--display); font-size: 15px; letter-spacing: 0.08em; }
.echo-identity small { color: var(--muted); font-size: 9px; }
.echo-identity > b { color: var(--muted); font: 700 8px/1 var(--utility); letter-spacing: 0.18em; }
.echo-thread { position: absolute; z-index: 1; top: 101px; left: 43px; width: 1px; height: 306px; background: linear-gradient(var(--mist), var(--coral), var(--mist)); }
.echo-thread::before, .echo-thread::after, .echo-thread i { position: absolute; left: 50%; width: 7px; height: 7px; border: 2px solid var(--surface); border-radius: 50%; background: var(--moss); box-shadow: 0 0 0 1px rgba(37, 75, 56, 0.15); content: ""; transform: translateX(-50%); }
.echo-thread::before { top: 70px; }.echo-thread i { top: 154px; }.echo-thread::after { top: 250px; background: var(--coral); }
.echo-messages { display: flex; position: relative; z-index: 2; min-height: 370px; flex-direction: column; gap: 8px; padding: 26px 3px 0 35px; }
.message { width: max-content; max-width: 86%; margin: 0; padding: 10px 13px; border-radius: 14px; font-size: 12px; line-height: 1.6; }
.message.mine { align-self: flex-end; border-bottom-right-radius: 4px; background: var(--mist); }
.message.theirs { align-self: flex-start; margin-top: 4px; border: 1px solid rgba(37, 75, 56, 0.08); border-bottom-left-radius: 4px; background: #fff; }
.understanding { display: flex; align-items: center; gap: 8px; margin: 6px 0 2px; color: var(--muted); font-size: 9px; }
.understanding span { display: flex; gap: 3px; }
.understanding i, .listen-state i { width: 4px; height: 4px; border-radius: 50%; background: var(--coral); animation: listen 1.15s infinite ease-in-out; }
.understanding i:nth-child(2), .listen-state i:nth-child(2) { animation-delay: 0.14s; }
.understanding i:nth-child(3), .listen-state i:nth-child(3) { animation-delay: 0.28s; }
.memory-chip { display: flex; width: max-content; margin-bottom: 1px; align-items: center; gap: 7px; padding: 6px 9px; border-radius: 9px; background: rgba(245, 215, 206, 0.56); color: #6d5048; font-size: 9px; }
.memory-chip span { font-weight: 800; }
.echo-window blockquote { position: relative; z-index: 2; margin: 14px 0 0 35px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--moss); font-family: var(--display); font-size: 15px; }

.section { width: min(calc(100% - 64px), var(--max)); margin: 0 auto; padding: 124px 0; }
.section h2 { margin: 22px 0 0; font-family: var(--display); font-size: clamp(46px, 5.3vw, 70px); font-weight: 700; line-height: 1.12; letter-spacing: -0.06em; }
.manifesto { padding-top: 150px; }
.manifesto h2 { max-width: 970px; }
.manifesto h2 span, .manifesto h2 strong { display: block; }
.manifesto h2 span { color: #7a877f; font-weight: 400; }
.manifesto h2 strong { margin-left: 1.15em; font-weight: 700; }
.capability-grid { display: grid; margin-top: 74px; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.capability-grid article { position: relative; min-height: 285px; padding: 33px 38px 34px 92px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background 0.25s ease; }
.capability-grid article:hover { background: rgba(254, 255, 249, 0.56); }
.capability-glyph { position: absolute; top: 34px; left: 34px; display: grid; width: 37px; height: 37px; place-items: center; border-radius: 50%; background: var(--mist); color: var(--moss); font-family: var(--display); font-size: 14px; }
.capability-grid article:nth-child(2) .capability-glyph, .capability-grid article:nth-child(3) .capability-glyph { background: var(--blush); color: #8f4938; }
.capability-grid h3 { margin: 5px 0 16px; font-family: var(--display); font-size: 25px; letter-spacing: -0.03em; }
.capability-grid p { max-width: 410px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

.rhythm { display: grid; width: min(calc(100% - 32px), 1240px); grid-template-columns: minmax(0, 0.82fr) minmax(470px, 1.18fr); gap: 75px; align-items: center; padding: 80px 72px; border-radius: 44px; background: var(--moss-deep); color: #f7fbf7; overflow: hidden; }
.rhythm-copy { position: relative; z-index: 2; }
.rhythm .section-label { color: #b8cabf; }
.rhythm h2 { margin-top: 24px; font-size: clamp(44px, 4.8vw, 64px); }
.rhythm-copy > p { max-width: 480px; margin: 24px 0 0; color: #b7c6bd; font-size: 14px; line-height: 1.9; }
.replay-link { display: inline-flex; margin-top: 30px; align-items: center; gap: 10px; padding: 0 0 7px; border: 0; border-bottom: 1px solid rgba(245, 215, 206, 0.42); background: transparent; color: var(--blush); cursor: pointer; font-size: 12px; }
.replay-link span { transition: transform 0.3s ease; }
.replay-link:hover span { transform: rotate(-120deg); }
.rhythm-demo { position: relative; min-height: 545px; padding: 27px 30px 23px; border-radius: 30px; background: var(--surface); color: var(--ink); box-shadow: 0 35px 80px rgba(0, 0, 0, 0.2); overflow: hidden; }
.rhythm-demo::after { position: absolute; right: -65px; bottom: -95px; width: 230px; height: 230px; border: 1px solid rgba(37, 75, 56, 0.09); border-radius: 50%; content: ""; box-shadow: 0 0 0 35px rgba(37, 75, 56, 0.025), 0 0 0 70px rgba(37, 75, 56, 0.018); }
.demo-topline { display: flex; position: relative; z-index: 1; align-items: center; justify-content: space-between; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.demo-topline span { font-family: var(--display); font-size: 15px; font-weight: 700; }
.demo-topline small { color: var(--muted); font: 600 8px/1 var(--utility); letter-spacing: 0.08em; }
.demo-track { display: grid; position: relative; z-index: 1; height: 2px; margin: 18px 0 30px; grid-template-columns: repeat(4, 1fr); gap: 5px; }
.demo-track i { border-radius: 2px; background: var(--mist); }
.demo-track i:last-child { background: var(--blush); }
.demo-conversation { display: flex; position: relative; z-index: 1; flex-direction: column; gap: 10px; }
.bubble { width: max-content; max-width: 82%; padding: 12px 15px; border-radius: 15px; font-size: 12px; line-height: 1.65; }
.bubble.you { align-self: flex-end; border-bottom-right-radius: 4px; background: var(--mist); }
.bubble.bot { align-self: flex-start; margin-top: 3px; border: 1px solid rgba(37, 75, 56, 0.09); border-bottom-left-radius: 4px; background: #fff; box-shadow: 0 10px 24px rgba(37, 75, 56, 0.06); }
.listen-state { display: flex; align-items: center; gap: 9px; margin: 5px 0; color: var(--muted); font-size: 9px; }
.listen-state span { display: flex; gap: 3px; }
.demo-note { position: absolute; z-index: 1; right: 30px; bottom: 20px; left: 30px; margin: 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 9px; }
.demo-note span { margin-right: 8px; color: var(--moss); font-weight: 800; }

.boundaries { display: grid; grid-template-columns: minmax(0, 0.86fr) minmax(480px, 1.14fr); gap: 90px; align-items: start; }
.boundary-heading { position: sticky; top: 40px; }
.boundary-heading h2 { margin-bottom: 25px; }
.boundary-heading p { max-width: 450px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.boundary-list { margin: 0; border-top: 1px solid var(--line); }
.boundary-list div { display: grid; min-height: 118px; grid-template-columns: 170px 1fr; gap: 28px; align-items: center; border-bottom: 1px solid var(--line); }
.boundary-list dt { font-family: var(--display); font-size: 18px; font-weight: 700; }
.boundary-list dd { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.boundary-list div::before { display: none; }

.journey { padding-top: 100px; }
.journey-heading { display: grid; grid-template-columns: 1.2fr 0.8fr; column-gap: 70px; }
.journey-heading .section-label { grid-column: 1 / -1; }
.journey-heading h2 { max-width: 720px; }
.journey-heading > p { align-self: end; margin: 0 0 5px; color: var(--muted); font-size: 14px; line-height: 1.85; }
.journey-list { margin: 66px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.journey-list li { display: grid; min-height: 154px; grid-template-columns: 75px 1fr auto; gap: 25px; align-items: center; border-bottom: 1px solid var(--line); transition: padding 0.25s ease, background 0.25s ease; }
.journey-list li:hover { padding: 0 18px; background: rgba(254, 255, 249, 0.58); }
.journey-list > li > span { display: grid; width: 43px; height: 43px; place-items: center; border: 1px solid rgba(37, 75, 56, 0.18); border-radius: 50%; color: var(--moss); font: 700 9px/1 var(--utility); }
.journey-list h3 { margin: 0 0 8px; font-family: var(--display); font-size: 25px; }
.journey-list p { margin: 0; color: var(--muted); font-size: 13px; }
.journey-list em { color: var(--muted); font: 600 10px/1 var(--utility); font-style: normal; letter-spacing: 0.1em; text-transform: uppercase; }
.journey-cta { margin-top: 34px; }

.faq { display: grid; grid-template-columns: minmax(280px, 0.68fr) minmax(0, 1.32fr); gap: 80px; padding-bottom: 150px; }
.faq-heading h2 { font-size: clamp(42px, 4.5vw, 60px); }
.faq-list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; min-height: 80px; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; font-size: 16px; font-weight: 700; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { color: var(--coral); content: "＋"; font-size: 20px; font-weight: 400; transition: transform 0.2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { max-width: 680px; margin: -3px 40px 27px 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

.closing { position: relative; display: flex; width: min(calc(100% - 32px), 1240px); min-height: 610px; margin: 0 auto; flex-direction: column; align-items: center; justify-content: center; padding: 70px 24px; border-radius: 44px; background: var(--moss); color: #fff; text-align: center; overflow: hidden; }
.closing::before, .closing::after { position: absolute; border: 1px solid rgba(245, 215, 206, 0.1); border-radius: 50%; content: ""; }
.closing::before { top: -280px; left: -160px; width: 560px; height: 560px; box-shadow: 0 0 0 65px rgba(245, 215, 206, 0.025); }
.closing::after { right: -190px; bottom: -340px; width: 620px; height: 620px; box-shadow: 0 0 0 70px rgba(245, 215, 206, 0.02); }
.closing-mark { z-index: 1; width: 50px; height: 50px; border: 1px solid rgba(245, 215, 206, 0.3); border-radius: 18px; background: transparent; }
.closing-mark::before, .closing-mark::after { top: 14px; width: 11px; height: 17px; }
.closing-mark::before { left: 10px; }.closing-mark::after { right: 10px; }
.closing > p { position: relative; z-index: 1; margin: 22px 0 0; color: #a9beb1; font: 700 9px/1 var(--utility); letter-spacing: 0.18em; }
.closing h2 { position: relative; z-index: 1; margin: 24px 0 15px; font-family: var(--display); font-size: clamp(57px, 7vw, 86px); line-height: 1.05; letter-spacing: -0.07em; }
.closing-copy { position: relative; z-index: 1; color: #bdccc3; font-size: 13px; }
.closing .button { position: relative; z-index: 1; margin-top: 29px; }

.site-footer { display: grid; width: min(calc(100% - 64px), var(--max)); min-height: 250px; margin: 0 auto; grid-template-columns: 1fr auto; gap: 26px; align-items: center; }
.footer-brand p { margin: 11px 0 0; color: var(--muted); font-size: 12px; }
.site-footer nav { display: flex; gap: 25px; color: var(--muted); font-size: 12px; }
.site-footer nav a:hover { color: var(--ink); }
.site-footer > small { grid-column: 1 / -1; align-self: start; color: var(--muted); font: 500 9px/1.5 var(--utility); letter-spacing: 0.06em; }

body.is-ready .hero-copy { animation: rise-in 0.72s both cubic-bezier(0.2, 0.72, 0.25, 1); }
body.is-ready .echo-window { animation: window-in 0.85s 0.12s both cubic-bezier(0.2, 0.72, 0.25, 1); }
.rhythm-demo.is-replaying .bubble, .rhythm-demo.is-replaying .listen-state { animation: replay-item 0.42s both ease-out; }
.rhythm-demo.is-replaying .bubble:nth-child(2) { animation-delay: 0.18s; }
.rhythm-demo.is-replaying .bubble:nth-child(3) { animation-delay: 0.36s; }
.rhythm-demo.is-replaying .listen-state { animation-delay: 0.58s; }
.rhythm-demo.is-replaying .bubble:nth-child(5) { animation-delay: 0.92s; }
@keyframes rise-in { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes window-in { from { opacity: 0; transform: rotate(1deg) translateY(30px); } to { opacity: 1; transform: rotate(1deg) translateY(0); } }
@keyframes replay-item { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes listen { 0%, 70%, 100% { opacity: 0.3; transform: translateY(0); } 35% { opacity: 1; transform: translateY(-4px); } }

@media (max-width: 1020px) {
  .site-header { grid-template-columns: 1fr auto auto; column-gap: 10px; }
  .site-nav { position: fixed; top: 78px; right: 18px; left: 18px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 14px; border: 1px solid var(--line); border-radius: 22px; background: rgba(254, 255, 249, 0.98); box-shadow: var(--shadow); }
  .site-nav a { padding: 13px 12px; }
  body.nav-open .site-nav { display: flex; }
  .header-actions { display: flex; gap: 0; }
  .header-actions .login-link { display: inline-flex; min-width: 44px; min-height: 44px; align-items: center; justify-content: center; }
  .header-actions .start-link { display: none; }
  .nav-toggle { display: grid; width: 44px; height: 44px; place-items: center; padding: 0; border: 1px solid var(--line); border-radius: 14px; background: rgba(254, 255, 249, 0.66); cursor: pointer; }
  .nav-toggle span { display: block; grid-area: 1 / 1; width: 17px; height: 1px; background: var(--ink); transition: transform 0.2s ease; }
  .nav-toggle span:first-child { transform: translateY(-4px); }.nav-toggle span:last-child { transform: translateY(4px); }
  body.nav-open .nav-toggle span:first-child { transform: rotate(45deg); } body.nav-open .nav-toggle span:last-child { transform: rotate(-45deg); }
  .hero { grid-template-columns: 1fr; gap: 55px; }
  .hero::before { display: none; }
  .echo-window { width: min(100%, 520px); justify-self: center; }
  .rhythm { grid-template-columns: 1fr; }
  .boundaries { grid-template-columns: 1fr; gap: 52px; }
  .boundary-heading { position: static; }
  .faq { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 720px) {
  .site-header, .assurance, .hero, .section, .site-footer { width: calc(100% - 28px); }
  .site-header { min-height: 76px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 12px; }
  .brand-mark::before, .brand-mark::after { top: 9px; width: 8px; height: 13px; }
  .brand-mark::before { left: 7px; }.brand-mark::after { right: 7px; }
  .brand-name strong { font-size: 20px; }
  .assurance { min-height: 58px; margin: 2px auto 10px; padding: 9px 13px; }
  .assurance > span { max-width: 230px; line-height: 1.45; }
  .assurance a { font-size: 0; }
  .assurance a b { font-size: 15px; }
  .hero { min-height: auto; gap: 46px; padding: 64px 2px 80px; }
  .hero h1 { margin-top: 20px; font-size: clamp(57px, 17vw, 76px); }
  .hero h1 .hero-love { margin-left: 0.34em; }
  .hero-lede { font-size: 14px; line-height: 1.85; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; }
  .hero-proof { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .hero-proof li { padding: 0; }
  .hero-proof li + li { padding: 12px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .echo-window { min-height: 580px; padding: 22px 18px; border-radius: 27px; transform: none; }
  .echo-thread { left: 34px; }
  .echo-messages { padding-left: 29px; }
  .echo-window blockquote { margin-left: 29px; font-size: 14px; }
  body.is-ready .echo-window { animation-name: rise-in; }
  .section { padding: 94px 0; }
  .section h2 { font-size: clamp(40px, 12vw, 56px); }
  .manifesto { padding-top: 106px; }
  .manifesto h2 strong { margin: 8px 0 0; }
  .capability-grid { grid-template-columns: 1fr; margin-top: 52px; }
  .capability-grid article { min-height: 250px; padding: 30px 25px 30px 79px; }
  .capability-glyph { top: 31px; left: 25px; }
  .rhythm { width: calc(100% - 16px); padding: 62px 18px 18px; border-radius: 32px; }
  .rhythm-copy { padding: 0 6px; }
  .rhythm h2 { font-size: clamp(40px, 12vw, 54px); }
  .rhythm-demo { min-height: 525px; padding: 23px 17px; border-radius: 24px; }
  .demo-note { right: 17px; left: 17px; }
  .bubble { max-width: 90%; }
  .boundary-list div { min-height: 130px; grid-template-columns: 1fr; gap: 7px; align-content: center; }
  .journey-heading { grid-template-columns: 1fr; }
  .journey-heading > p { margin-top: 23px; }
  .journey-list { margin-top: 48px; }
  .journey-list li { min-height: 165px; grid-template-columns: 54px 1fr; gap: 10px; }
  .journey-list em { display: none; }
  .journey-list > li > span { width: 38px; height: 38px; }
  .faq { gap: 38px; padding-bottom: 105px; }
  .faq summary { min-height: 74px; font-size: 14px; }
  .closing { width: calc(100% - 16px); min-height: 560px; border-radius: 32px; }
  .closing h2 { font-size: clamp(54px, 16vw, 72px); }
  .site-footer { grid-template-columns: 1fr; padding: 58px 0 35px; }
  .site-footer nav { flex-wrap: wrap; gap: 15px 22px; }
  .site-footer > small { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}