:root {
  --sky: #b8cddd;
  --sky-deep: #9dbdd0;
  --ink: #17252c;
  --yellow: #ffe733;
  --cream: #f7f6f0;
  --white: #fffefa;
  --muted: #687c84;
  --line: rgba(23, 37, 44, 0.15);
  --serif: Georgia, 'Times New Roman', 'Songti SC', serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--cream); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.site-header { position: fixed; z-index: 20; top: 0; left: 0; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; width: 100%; height: 82px; padding: 0 clamp(24px, 5vw, 78px); transition: background .25s, height .25s, box-shadow .25s; }
.site-header.is-scrolled { height: 68px; background: rgba(247,246,240,.9); box-shadow: 0 1px 0 var(--line); backdrop-filter: blur(16px); }
.brand, .footer-brand { justify-self: start; font-family: var(--serif); font-size: 25px; font-weight: 700; letter-spacing: 5px; }
.brand span, .footer-brand span { display: inline-block; width: 7px; height: 7px; margin: 0 0 3px 2px; border-radius: 50%; background: var(--yellow); }
.desktop-nav { display: flex; gap: 38px; font-size: 12px; font-weight: 650; }
.desktop-nav a { position: relative; padding: 10px 0; }
.desktop-nav a::after { content: ''; position: absolute; bottom: 5px; left: 0; width: 0; height: 1px; background: var(--ink); transition: width .2s; }
.desktop-nav a:hover::after { width: 100%; }
.header-cta { justify-self: end; padding: 12px 18px; border: 1px solid var(--ink); border-radius: 999px; font-size: 12px; font-weight: 750; }
.header-cta span { margin-left: 8px; }

.hero { position: relative; min-height: 780px; height: 100svh; max-height: 970px; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(420px, .95fr); align-items: center; overflow: hidden; padding: 110px clamp(24px, 7vw, 110px) 50px; background: var(--sky); }
.hero::before { content: ''; position: absolute; right: 36%; bottom: -260px; width: 620px; height: 620px; border: 1px solid rgba(255,255,255,.44); border-radius: 50%; }
.hero-copy { position: relative; z-index: 2; max-width: 730px; }
.eyebrow { margin: 0 0 25px; color: #496776; font-size: 10px; font-weight: 800; letter-spacing: 2.4px; }
.eyebrow > span { display: inline-block; width: 20px; height: 2px; margin: 0 10px 3px 0; background: var(--yellow); }
.hero h1, .flow h2, .download h2 { margin: 0; font-family: var(--serif); font-size: clamp(52px, 6.4vw, 96px); font-weight: 400; line-height: 1.03; letter-spacing: -4px; }
h1 em, .flow h2 em { color: var(--white); font-weight: 400; }
.hero-intro { max-width: 560px; margin: 30px 0 0; color: #344d58; font-size: 16px; line-height: 2; }
.hero-actions { display: flex; align-items: center; gap: 32px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 0 25px; border-radius: 999px; font-size: 13px; font-weight: 750; }
.button-dark { color: var(--white); background: var(--ink); box-shadow: 0 12px 30px rgba(23,37,44,.15); }
.button-dark span { margin-left: 28px; color: var(--yellow); }
.button-dark:hover { transform: translateY(-2px); }
.text-link { padding: 12px 0; border-bottom: 1px solid rgba(23,37,44,.45); font-size: 12px; font-weight: 700; }
.text-link span { margin-left: 12px; }
.platform-note { margin: 18px 0 0; color: #617985; font-size: 10px; letter-spacing: .4px; }
.hero-art { position: relative; z-index: 1; height: 630px; }
.orbit { position: absolute; border: 1px solid rgba(255,255,255,.55); border-radius: 50%; }
.orbit-one { top: 32px; right: -90px; width: 540px; height: 540px; }
.orbit-two { top: 108px; right: -14px; width: 390px; height: 390px; }
.conversation-card { position: absolute; z-index: 2; top: 92px; left: 7%; width: min(390px, 83%); min-height: 470px; padding: 27px; overflow: hidden; border: 1px solid rgba(255,255,255,.8); border-radius: 34px; background: rgba(255,254,250,.95); box-shadow: 0 32px 70px rgba(41,70,84,.19); transform: rotate(-2.5deg); }
.card-topline, .mini-profile, .learning-chip, .card-footer { display: flex; align-items: center; }
.card-topline, .card-footer { justify-content: space-between; }
.mini-profile { gap: 10px; }
.avatar { position: relative; display: block; width: 42px; height: 42px; border-radius: 14px; background: #94b7cc; }
.avatar::before { content: ''; position: absolute; top: 9px; left: 16px; width: 10px; height: 10px; border-radius: 50%; background: var(--white); }
.avatar::after { content: ''; position: absolute; bottom: 8px; left: 11px; width: 20px; height: 12px; border-radius: 12px 12px 7px 7px; background: var(--white); }
.mini-profile b, .mini-profile small { display: block; }
.mini-profile b { font-size: 12px; }
.mini-profile small { margin-top: 3px; color: #78909b; font-size: 8px; }
.online { padding: 6px 8px; border-radius: 8px; color: #587788; background: #e5eff3; font-size: 7px; font-weight: 900; letter-spacing: 1.2px; }
.korean-line { margin: 42px 0 0; font-family: var(--serif); font-size: 29px; line-height: 1.35; }
.translation { margin: 8px 0 20px; color: #6e838b; font-size: 11px; }
.learning-chip { gap: 8px; padding: 11px 13px; border-radius: 12px; background: #eaf2f4; }
.learning-chip span { font-weight: 800; }
.learning-chip b { color: #5b747e; font-size: 10px; font-weight: 500; }
.learning-chip i { margin-left: auto; font-style: normal; }
.reply-bubble { width: 88%; margin: 22px 0 25px auto; padding: 15px 17px; border-radius: 18px 5px 18px 18px; background: var(--yellow); font-size: 11px; line-height: 1.6; }
.card-footer { padding-top: 18px; border-top: 1px solid var(--line); color: #78909b; font-size: 7px; font-weight: 800; letter-spacing: 1px; }
.floating-note { position: absolute; z-index: 3; padding: 14px 16px; border: 1px solid rgba(255,255,255,.72); border-radius: 18px; background: rgba(255,255,255,.79); box-shadow: 0 16px 35px rgba(39,62,73,.15); backdrop-filter: blur(12px); }
.floating-note b, .floating-note small { display: block; }
.floating-note small { margin-top: 4px; color: #6b8089; font-size: 8px; }
.note-one { top: 67px; right: 0; min-width: 142px; display: flex; align-items: center; gap: 10px; }
.note-one > span { flex: 0 0 auto; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: var(--yellow); background: var(--ink); }
.note-one > div { min-width: 0; }
.note-one b { font-size: 11px; }
.note-one b, .note-one small { white-space: nowrap; }
.note-two { right: 9%; bottom: 40px; text-align: center; }
.note-two b { font-family: var(--serif); font-size: 31px; }
.hero-index { position: absolute; right: 4vw; bottom: 24px; color: rgba(23,37,44,.36); font-family: var(--serif); font-size: 13px; }

.manifesto, .features, .faq { padding: 115px clamp(24px, 7vw, 110px); }
.manifesto { overflow: hidden; background: var(--cream); }
.section-label { display: flex; align-items: center; justify-content: space-between; padding-bottom: 18px; border-bottom: 1px solid var(--line); color: #6a7d85; font-size: 10px; font-weight: 800; letter-spacing: 2px; }
.section-label span { font-family: var(--serif); font-size: 13px; font-weight: 400; letter-spacing: 0; }
.manifesto-grid, .faq-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 9vw; }
.manifesto h2, .feature-intro h2, .faq h2 { margin: 0; font-family: var(--serif); font-size: clamp(43px, 5.2vw, 72px); font-weight: 400; line-height: 1.1; letter-spacing: -2px; }
.manifesto-copy { padding-top: 8px; }
.manifesto-copy p { margin: 0 0 25px; color: #4e636d; font-size: 15px; line-height: 2; }
.manifesto-copy p:first-child { color: var(--ink); font-family: var(--serif); font-size: 22px; line-height: 1.65; }
.word-ribbon { display: flex; align-items: center; gap: 28px; width: max-content; margin-top: 110px; color: #9babb0; font-family: var(--serif); font-size: clamp(42px, 6vw, 86px); white-space: nowrap; animation: drift 25s linear infinite alternate; }
.word-ribbon span:nth-of-type(2) { color: var(--ink); }
.word-ribbon span:nth-of-type(3) { color: var(--sky-deep); }
.word-ribbon i { color: var(--yellow); font-style: normal; }
@keyframes drift { to { transform: translateX(-18%); } }

.features { background: var(--white); }
.feature-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; margin: 0 0 45px; }
.feature-intro p { max-width: 360px; margin: 0 0 9px; color: var(--muted); line-height: 1.8; }
.feature-grid { display: grid; grid-template-columns: 1fr 1fr; }
.feature { position: relative; min-height: 480px; display: flex; flex-direction: column; justify-content: space-between; padding: 38px; overflow: hidden; }
.feature:nth-child(1), .feature:nth-child(4) { background: var(--yellow); }
.feature:nth-child(2) { background: var(--sky); }
.feature:nth-child(3) { color: var(--white); background: var(--ink); }
.feature-discussion { grid-column: 1 / -1; min-height: 540px; display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: clamp(45px, 8vw, 120px); color: var(--ink); background: var(--cream); }
.feature-number { position: absolute; top: 28px; right: 30px; font-family: var(--serif); font-size: 13px; opacity: .55; }
.feature-icon { height: 130px; }
.speech-icon { position: relative; width: 155px; height: 95px; display: flex; align-items: center; justify-content: center; gap: 8px; border: 2px solid var(--ink); border-radius: 50%; }
.speech-icon::after { content: ''; position: absolute; right: 5px; bottom: 0; width: 26px; height: 22px; border-right: 2px solid var(--ink); transform: rotate(27deg); }
.speech-icon span { width: 8px; height: 8px; border-radius: 50%; background: var(--ink); }
.underline-icon { position: relative; font-family: var(--serif); font-size: 90px; line-height: 1; }
.underline-icon span { position: absolute; bottom: 5px; left: 0; width: 95px; height: 9px; background: var(--yellow); transform: rotate(-3deg); }
.route-icon { position: relative; width: 170px; }
.route-icon::before { content: ''; position: absolute; top: 22px; left: 14px; width: 135px; height: 67px; border-top: 2px dashed var(--sky); border-radius: 50%; transform: rotate(-9deg); }
.route-icon i { position: absolute; width: 17px; height: 17px; border: 3px solid var(--yellow); border-radius: 50%; }
.route-icon i:nth-child(1) { top: 15px; left: 8px; }.route-icon i:nth-child(2) { top: 67px; left: 78px; }.route-icon i:nth-child(3) { top: 25px; right: 5px; }
.cards-icon { position: relative; }
.cards-icon i { position: absolute; width: 90px; height: 115px; border: 2px solid var(--ink); border-radius: 16px; }
.cards-icon i:first-child { left: 22px; transform: rotate(-8deg); background: var(--white); }
.cards-icon i:last-child { left: 65px; transform: rotate(8deg); background: var(--sky); }
.discussion-preview { position: relative; max-width: 650px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 20px 0; }
.discussion-lane { min-width: 0; }
.lane-heading { display: flex; align-items: center; gap: 9px; min-height: 35px; margin-bottom: 9px; padding: 0 4px; color: #61757e; font-size: 10px; }
.lane-heading span { font-family: var(--serif); }
.lane-heading b { color: var(--ink); font-size: 11px; }
.lane-heading i { margin-left: auto; display: grid; place-items: center; width: 25px; height: 25px; border-radius: 50%; color: var(--yellow); background: var(--ink); font-size: 14px; font-style: normal; }
.discussion-post { position: relative; min-height: 260px; padding: 20px; border: 1px solid var(--line); border-radius: 22px; }
.discussion-original { background: var(--white); }
.discussion-target { background: #e6f0f3; box-shadow: 0 18px 45px rgba(49,72,82,.1); }
.discussion-person { display: flex; align-items: center; gap: 10px; }
.discussion-person span { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; color: var(--white); background: var(--ink); font-family: var(--serif); font-size: 12px; }
.discussion-target .discussion-person span { color: var(--ink); background: var(--yellow); }
.discussion-person b { color: #70838b; font-size: 9px; letter-spacing: .5px; }
.discussion-post p { margin: 17px 0 10px; font-family: var(--serif); font-size: clamp(17px, 1.7vw, 23px); line-height: 1.55; }
.discussion-post small { color: #6b7f87; font-size: 10px; line-height: 1.7; }
.discussion-post small u { color: #416a7d; text-decoration-color: var(--yellow); text-decoration-thickness: 3px; text-underline-offset: 3px; }
.discussion-post p u { color: #19618e; background: #d8efff; text-decoration: none; font-weight: 700; }
.forum-actions { position: absolute; right: 18px; bottom: 17px; left: 18px; display: flex; align-items: center; gap: 14px; padding-top: 12px; border-top: 1px solid rgba(23,37,44,.1); color: #58717c; font-size: 9px; }
.forum-actions span:last-child { margin-left: auto; font-size: 15px; }
.discussion-copy { align-self: center; }
.discussion-copy h3 { font-size: clamp(34px, 4vw, 55px); }
.discussion-copy > p:last-child { max-width: 510px; margin-top: 25px; font-size: 14px; line-height: 2; opacity: .72; }
.feature-kicker { margin: 0 0 12px; font-size: 10px; font-weight: 800; letter-spacing: 2px; }
.feature h3 { margin: 0; font-family: var(--serif); font-size: clamp(29px, 3vw, 42px); font-weight: 400; line-height: 1.16; letter-spacing: -1px; }
.feature > div:last-child > p:last-child { max-width: 480px; margin: 20px 0 0; font-size: 13px; line-height: 1.8; opacity: .72; }

.flow { display: grid; grid-template-columns: 1.05fr .95fr; gap: 10vw; padding: 130px clamp(24px, 7vw, 110px); background: var(--sky); }
.flow h2 { font-size: clamp(44px, 5.4vw, 76px); }
.flow-copy > p:last-child { max-width: 500px; margin: 30px 0 0; color: #4d6874; font-size: 15px; line-height: 2; }
.flow-steps { margin: 0; padding: 10px 0 0; list-style: none; }
.flow-steps li { display: grid; grid-template-columns: 40px 1fr; padding: 24px 0; border-bottom: 1px solid rgba(23,37,44,.19); }
.flow-steps li > span { grid-row: 1 / 3; color: #5d7783; font-family: var(--serif); font-size: 13px; }
.flow-steps b { font-family: var(--serif); font-size: 22px; font-weight: 400; }
.flow-steps small { margin-top: 7px; color: #57717c; font-size: 11px; }

.download { position: relative; min-height: 660px; display: grid; grid-template-columns: 1fr 1fr; align-items: center; overflow: hidden; padding: 90px clamp(24px, 7vw, 110px); color: var(--white); background: var(--ink); }
.download-copy { position: relative; z-index: 2; }
.download .eyebrow { color: var(--sky); }
.download h2 { max-width: 760px; font-size: clamp(45px, 5.5vw, 78px); }
.download-copy > p:not(.eyebrow):not(.release-note) { max-width: 500px; margin: 28px 0; color: #aec0c7; line-height: 1.9; }
.store-row { display: flex; gap: 12px; margin-top: 28px; }
.store-button { min-width: 174px; height: 59px; display: flex; align-items: center; gap: 12px; padding: 0 18px; border: 1px solid rgba(255,255,255,.3); border-radius: 14px; color: var(--white); background: transparent; cursor: pointer; text-align: left; }
.store-button:hover { border-color: var(--yellow); }
.store-button small, .store-button b { display: block; }
.store-button small { font-size: 8px; letter-spacing: .5px; }
.store-button b { margin-top: 2px; font-size: 16px; }
.apple-mark { color: var(--yellow); font-size: 23px; }
.android-mark { color: var(--sky); font-size: 28px; }
.store-disabled { opacity: .6; }
.release-note { color: #8298a2; font-size: 10px; }
.download-mark { position: relative; z-index: 1; display: flex; justify-content: center; font-family: var(--serif); font-size: clamp(110px, 16vw, 240px); letter-spacing: -.14em; }
.download-mark span { display: inline-block; }
.download-mark span:nth-child(1) { color: var(--sky); transform: translate(25%, -13%) rotate(-9deg); }
.download-mark span:nth-child(2) { position: relative; z-index: 2; color: var(--yellow); transform: rotate(4deg); }
.download-mark span:nth-child(3) { color: var(--cream); transform: translate(-20%, 11%) rotate(9deg); }
.download-orb { position: absolute; border: 1px solid rgba(184,205,221,.2); border-radius: 50%; }
.orb-a { right: -150px; width: 650px; height: 650px; }.orb-b { right: 20px; width: 360px; height: 360px; }

.faq { background: var(--cream); }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; padding: 25px 0; cursor: pointer; font-family: var(--serif); font-size: 19px; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: #69818b; font-family: var(--sans); font-size: 22px; font-weight: 300; }
.faq-list details p { margin: -5px 42px 25px 0; color: var(--muted); font-size: 13px; line-height: 1.9; }

footer { padding: 70px clamp(24px, 7vw, 110px) 28px; color: var(--white); background: var(--ink); }
.footer-main { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: start; padding-bottom: 70px; }
.footer-brand { font-size: 38px; }.footer-main p { margin: 0; color: #9eb0b8; font-family: var(--serif); font-size: 20px; line-height: 1.5; }.back-top { justify-self: end; border-bottom: 1px solid #667982; padding-bottom: 7px; font-size: 11px; }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 23px; border-top: 1px solid rgba(255,255,255,.14); color: #738890; font-size: 10px; }
.footer-bottom nav { display: flex; gap: 27px; }
.footer-bottom a:hover { color: var(--white); }
.toast { position: fixed; z-index: 50; left: 50%; bottom: 25px; padding: 13px 19px; border-radius: 999px; color: var(--yellow); background: rgba(23,37,44,.95); box-shadow: 0 12px 30px rgba(0,0,0,.2); font-size: 12px; opacity: 0; pointer-events: none; transform: translate(-50%, 15px); transition: .25s; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

.legal-body { background: var(--cream); }
.legal-header { position: static; background: var(--sky); }
.legal-main { max-width: 850px; margin: 0 auto; padding: 90px 28px 130px; }
.legal-main .eyebrow { margin-bottom: 18px; }.legal-main h1 { margin: 0 0 20px; font-family: var(--serif); font-size: clamp(48px, 7vw, 76px); font-weight: 400; }.legal-meta { color: var(--muted); font-size: 12px; }.legal-notice { margin: 45px 0; padding: 20px 22px; border-left: 4px solid var(--yellow); background: var(--white); font-size: 13px; line-height: 1.8; }.legal-main h2 { margin: 42px 0 12px; font-family: var(--serif); font-size: 25px; font-weight: 400; }.legal-main p, .legal-main li { color: #4e626b; font-size: 14px; line-height: 1.9; }.legal-main ul { padding-left: 20px; }

@media (max-width: 900px) {
  .desktop-nav { display: none; }
  .site-header { grid-template-columns: 1fr 1fr; }
  .hero { height: auto; max-height: none; grid-template-columns: 1fr; padding-top: 140px; }
  .hero-copy { max-width: 660px; }
  .hero-art { width: min(600px, 100%); margin: 10px auto 0; }
  .manifesto-grid, .faq-layout, .flow, .download { grid-template-columns: 1fr; }
  .feature { min-height: 440px; }
  .feature-discussion { min-height: 720px; grid-template-columns: 1fr; gap: 35px; }
  .download { gap: 50px; }.download-mark { justify-content: flex-start; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px; }.back-top { grid-column: 2; }
}

@media (max-width: 620px) {
  .site-header { height: 68px; padding: 0 20px; }.brand { font-size: 21px; }.header-cta { padding: 10px 14px; }
  .hero { min-height: 0; padding: 120px 21px 45px; }.hero h1 { font-size: 50px; letter-spacing: -2.5px; }.hero-intro { font-size: 14px; }.hero-actions { align-items: flex-start; flex-direction: column; gap: 12px; }.platform-note { margin-top: 9px; }
  .hero-art { height: 520px; }.conversation-card { top: 74px; left: 2%; width: 90%; min-height: 410px; padding: 21px; }.korean-line { margin-top: 29px; font-size: 25px; }.note-one { top: 44px; right: -5px; }.note-two { right: 0; bottom: 5px; }.orbit-one { width: 440px; height: 440px; }
  .manifesto, .features, .faq { padding: 80px 21px; }.manifesto-grid, .faq-layout { gap: 36px; }.manifesto h2, .feature-intro h2, .faq h2 { font-size: 42px; }.word-ribbon { margin-top: 75px; font-size: 46px; }
  .feature-intro { align-items: flex-start; flex-direction: column; margin: 0 0 32px; }.feature-grid { grid-template-columns: 1fr; }.feature { min-height: 430px; padding: 30px 25px; }.feature h3 { font-size: 34px; }
  .feature-discussion { grid-column: auto; min-height: 820px; grid-template-columns: 1fr; gap: 35px; }.discussion-preview { grid-template-columns: 1fr; padding: 25px 0 0; }.discussion-post { min-height: 225px; }.discussion-copy h3 { font-size: 36px; }
  .flow { gap: 45px; padding: 85px 21px; }.flow h2 { font-size: 45px; letter-spacing: -2px; }
  .download { min-height: 0; padding: 85px 21px; }.download h2 { font-size: 45px; letter-spacing: -2px; }.store-row { align-items: stretch; flex-direction: column; }.store-button { width: 210px; }.download-mark { font-size: 140px; }
  .faq-list summary { font-size: 17px; }
  footer { padding: 60px 21px 26px; }.footer-main { grid-template-columns: 1fr; }.back-top { grid-column: auto; justify-self: start; }.footer-bottom { align-items: flex-start; flex-direction: column-reverse; gap: 25px; }.footer-bottom nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }.word-ribbon { animation: none; }.reveal { opacity: 1; transform: none; transition: none; }
}