:root {
  color-scheme: light;
  --paper: #f6f5ef;
  --paper-deep: #eaece3;
  --ink: #16221e;
  --muted: #66736d;
  --line: #d7ded4;
  --forest: #163d31;
  --forest-deep: #0e2d25;
  --lime: #d9f078;
  --orange: #ef8d62;
  --white: #ffffff;
  font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-shell { max-width: 1600px; margin: 0 auto; }
.site-header { height: 94px; display: flex; align-items: center; justify-content: space-between; padding: 0 5.3%; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; gap: 12px; align-items: center; font-size: 19px; font-weight: 800; letter-spacing: -.04em; white-space: nowrap; }
.brand-divider { color: #9aa69e; margin: 0 5px; font-weight: 400; }
.brand-mark { width: 31px; height: 31px; border-radius: 9px; background: var(--forest); display: inline-flex; align-items: center; justify-content: center; gap: 3px; transform: rotate(-8deg); }
.brand-mark i { display: block; width: 4px; border-radius: 3px; background: var(--lime); transform: rotate(8deg); }
.brand-mark i:nth-child(1) { height: 10px; }
.brand-mark i:nth-child(2) { height: 18px; }
.brand-mark i:nth-child(3) { height: 13px; }
.top-nav { display: flex; align-items: center; gap: 36px; color: #4f5e55; font-size: 13px; font-weight: 600; }
.top-nav a:not(.nav-cta):hover { color: var(--forest); }
.nav-cta { background: var(--forest); color: var(--white); padding: 12px 18px; border-radius: 100px; display: inline-flex; gap: 26px; align-items: center; transition: transform .2s, background .2s; }
.nav-cta:hover { background: var(--forest-deep); transform: translateY(-2px); }

.hero { display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(380px, .94fr); min-height: 620px; padding: 68px 5.3% 77px; gap: 2%; overflow: hidden; }
.hero-copy { position: relative; z-index: 1; padding: 45px 0 0; }
.eyebrow, .section-kicker { color: var(--forest); font-size: 12px; font-weight: 800; letter-spacing: .17em; text-transform: uppercase; }
.eyebrow { display: flex; gap: 10px; align-items: center; }
.eyebrow-line { width: 24px; height: 2px; background: var(--orange); }
.hero h1 { font-size: clamp(43px, 4.25vw, 72px); line-height: 1.22; letter-spacing: -.065em; margin: 34px 0 26px; font-weight: 800; }
.hero h1 em, .principles-intro h2 em, .chat-sidebar h1 em, .chat-welcome h2 em { font-style: normal; color: #47745e; }
.hero-intro { color: #596960; font-size: 16px; line-height: 1.9; max-width: 570px; margin: 0 0 37px; }
.question-form { display: flex; align-items: center; gap: 12px; background: var(--white); padding: 8px 8px 8px 21px; border: 1px solid #d8ded5; box-shadow: 0 18px 45px rgba(26, 52, 39, .08); border-radius: 18px; max-width: 600px; }
.search-icon { font-size: 31px; line-height: 1; color: #6d8a76; transform: rotate(-20deg); }
.question-form input { flex: 1; min-width: 0; border: none; background: transparent; outline: none; color: var(--ink); font-size: 14px; }
.question-form input::placeholder { color: #9ca8a0; }
.question-form button { border: 0; border-radius: 12px; background: var(--forest); color: var(--white); padding: 15px 18px; white-space: nowrap; font-size: 13px; font-weight: 700; transition: background .2s; }
.question-form button:hover { background: var(--forest-deep); }
.question-form button span { margin-left: 18px; }
.hero-notes { margin-top: 18px; color: #7c8a80; font-size: 12px; display: flex; gap: 10px; align-items: center; }
.note-dot { display: inline-block; width: 7px; height: 7px; flex: 0 0 7px; background: #6aac7b; border-radius: 50%; box-shadow: 0 0 0 3px rgba(106, 172, 123, .14); }
.note-separator { color: #aab6ac; }

.hero-art { min-height: 530px; position: relative; isolation: isolate; }
.art-orbit { position: absolute; border: 1px solid rgba(40, 83, 64, .16); border-radius: 50%; z-index: -1; }
.orbit-one { width: 560px; height: 560px; top: -80px; left: 4%; }
.orbit-two { width: 400px; height: 400px; top: 5px; left: 20%; }
.art-index { position: absolute; right: 4%; top: 26px; color: #365f4c; font-size: 13px; letter-spacing: .15em; font-weight: 800; }
.art-index span { color: #b5c0b5; }
.art-main-card { position: absolute; top: 71px; left: 12%; width: min(410px, 82%); height: 415px; border-radius: 18px; background: var(--forest); color: white; padding: 26px 31px; box-shadow: 27px 31px 0 #dce5d4, 0 20px 50px rgba(19, 55, 40, .16); transform: rotate(-5deg); overflow: hidden; }
.art-main-card::before, .art-main-card::after { content: ''; position: absolute; border-radius: 50%; border: 1px solid rgba(218, 240, 120, .16); }
.art-main-card::before { width: 400px; height: 400px; right: -180px; top: 120px; }
.art-main-card::after { width: 300px; height: 300px; right: -140px; top: 160px; }
.art-card-top, .art-card-bottom { position: relative; z-index: 1; display: flex; align-items: center; gap: 9px; font-size: 10px; font-weight: 700; letter-spacing: .14em; color: #b8d1b8; }
.art-card-top span:last-child { margin-left: auto; font-size: 20px; color: var(--lime); }
.art-signal { width: 7px; height: 7px; border: 1px solid var(--lime); border-radius: 50%; }
.art-quote { position: relative; z-index: 1; margin-top: 77px; font-size: clamp(28px, 2.5vw, 39px); line-height: 1.47; letter-spacing: -.05em; font-weight: 700; }
.art-quote span { color: var(--lime); }
.art-card-bottom { position: absolute; left: 31px; right: 31px; bottom: 23px; justify-content: space-between; border-top: 1px solid rgba(225, 244, 219, .19); padding-top: 15px; }
.art-arrow { color: var(--lime); font-size: 22px; }
.art-floating-card { position: absolute; right: 0; bottom: 56px; z-index: 2; background: #fff; border: 1px solid #e0e7db; border-radius: 14px; box-shadow: 0 18px 35px rgba(27, 53, 39, .12); padding: 19px 25px; display: flex; gap: 15px; align-items: center; font-size: 13px; font-weight: 800; line-height: 1.35; transform: rotate(5deg); }
.art-floating-card small { color: #89998b; font-weight: 500; }
.floating-symbol { background: #e8f1de; color: #497d59; width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; font-size: 24px; }
.art-caption { position: absolute; bottom: 10px; left: 15%; color: #7f8c7f; font-size: 12px; letter-spacing: .09em; }

.preview-banner { background: #e7eddf; padding: 20px 5.3%; display: grid; grid-template-columns: 185px 1fr 20px; align-items: center; gap: 26px; border-top: 1px solid #d8e4d4; border-bottom: 1px solid #d8e4d4; }
.preview-label { color: #41634a; font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.preview-banner p { color: #536c56; font-size: 13px; margin: 0; }
.preview-icon { color: #557357; font-size: 21px; }
.explore-section { padding: 105px 5.3% 115px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; margin-bottom: 37px; gap: 25px; }
.section-heading h2 { font-size: clamp(30px, 3vw, 46px); letter-spacing: -.06em; margin: 12px 0 0; }
.section-heading p { margin: 0 0 5px; color: #748177; font-size: 14px; }
.explore-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.explore-card { text-align: left; border: 1px solid var(--line); background: #fff; min-height: 296px; border-radius: 17px; padding: 25px 26px 22px; display: flex; flex-direction: column; color: var(--ink); transition: transform .22s, box-shadow .22s, border-color .22s; }
.explore-card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(20, 47, 32, .08); border-color: #b4c9b2; }
.card-number { display: flex; justify-content: space-between; font-size: 12px; color: #8ca08c; font-weight: 800; }
.card-number span { font-size: 20px; color: #52775c; }
.card-glyph { color: #598265; font-size: 49px; height: 75px; line-height: 75px; }
.explore-card strong { font-size: 19px; letter-spacing: -.04em; }
.card-description { color: #6e7d72; font-size: 13px; margin-top: 11px; line-height: 1.7; }
.card-example { color: #4d7558; border-top: 1px solid #e7ebe4; padding-top: 17px; margin-top: auto; font-size: 12px; font-weight: 700; }

.principles-section { background: #e9eee7; padding: 112px 5.3% 117px; display: grid; grid-template-columns: minmax(300px, .8fr) minmax(0, 1.2fr); gap: 11%; }
.principles-intro h2 { font-size: clamp(36px, 3.4vw, 54px); letter-spacing: -.06em; line-height: 1.3; margin: 18px 0; }
.principles-intro p { max-width: 380px; font-size: 14px; color: #6f8072; line-height: 1.9; }
.text-link { display: inline-block; margin-top: 25px; color: var(--forest); border-bottom: 1px solid var(--forest); padding-bottom: 7px; font-size: 13px; font-weight: 800; }
.text-link span { margin-left: 38px; }
.principle-list { border-top: 1px solid #cbd9cb; }
.principle { display: grid; grid-template-columns: 42px 1fr 20px; gap: 10px; border-bottom: 1px solid #cbd9cb; padding: 29px 0 31px; align-items: start; }
.principle > span:first-child { color: #73917a; font-size: 12px; font-weight: 800; }
.principle h3 { font-size: 18px; margin: 0 0 8px; letter-spacing: -.03em; }
.principle p { margin: 0; color: #738276; font-size: 13px; line-height: 1.7; }
.principle > span:last-child { color: #77957a; font-size: 20px; }
.site-footer { padding: 26px 5.3%; background: var(--forest-deep); color: #afc6af; display: flex; justify-content: space-between; gap: 20px; align-items: center; font-size: 12px; }
.site-footer span:first-child { color: white; font-weight: 800; letter-spacing: .03em; }
.site-footer a { color: var(--lime); font-weight: 700; }

.chat-shell { min-height: 100vh; display: grid; grid-template-columns: 300px minmax(0, 1fr); }
.chat-sidebar { background: var(--forest-deep); color: #fff; padding: 30px 25px 27px; display: flex; flex-direction: column; }
.chat-sidebar .brand { font-size: 17px; }
.chat-sidebar .brand-mark { background: var(--lime); }
.chat-sidebar .brand-mark i { background: var(--forest-deep); }
.chat-sidebar .brand-divider { color: #8ba798; }
.sidebar-inner { margin-top: 117px; }
.sidebar-section-label { color: var(--lime); font-size: 10px; letter-spacing: .2em; font-weight: 800; }
.chat-sidebar h1 { font-size: 35px; line-height: 1.3; letter-spacing: -.06em; margin: 19px 0 16px; }
.chat-sidebar h1 em { color: var(--lime); }
.chat-sidebar p { color: #a8bdaf; font-size: 12px; line-height: 1.85; }
.examples-label { color: #8eab96; margin-top: 58px; margin-bottom: 16px; }
.suggestion-list { display: grid; gap: 7px; }
.suggestion-list button { width: 100%; padding: 12px 0; border: 0; border-bottom: 1px solid rgba(183, 214, 183, .16); background: none; color: #d8e7d9; text-align: left; font-size: 12px; display: flex; justify-content: space-between; gap: 10px; }
.suggestion-list button:hover { color: var(--lime); }
.suggestion-list button span { color: var(--lime); }
.sidebar-footer { margin-top: auto; padding-top: 30px; display: flex; align-items: center; gap: 10px; font-size: 11px; color: #b1cbb5; }
.chat-main { min-width: 0; height: 100vh; display: flex; flex-direction: column; }
.chat-header { height: 86px; flex: 0 0 86px; border-bottom: 1px solid var(--line); padding: 0 4%; display: flex; align-items: center; justify-content: space-between; }
.chat-header > div { display: grid; gap: 4px; }
.header-overline { color: #8a9d8d; font-size: 9px; letter-spacing: .16em; font-weight: 800; }
.chat-header strong { font-size: 16px; letter-spacing: -.04em; }
.back-home { color: #607666; font-size: 12px; font-weight: 700; }
.back-home:hover { color: var(--forest); }
.mobile-brand { display: none; }
.chat-content { flex: 1; min-width: 0; min-height: 0; display: flex; flex-direction: column; }
.conversation { flex: 1; min-width: 0; overflow: auto; padding: 30px 5% 10px; }
.chat-welcome { width: min(440px, 100%); margin: max(55px, 8vh) auto 30px; text-align: center; }
.welcome-symbol { margin: 0 auto 23px; display: grid; place-items: center; width: 58px; height: 58px; border-radius: 17px; color: var(--forest); background: #e3ebdd; font-size: 32px; transform: rotate(-10deg); }
.status-chip { display: inline-flex; align-items: center; gap: 9px; color: #4c7154; background: #eaf0e7; border: 1px solid #dae6d8; padding: 7px 11px; border-radius: 100px; font-size: 11px; font-weight: 800; }
.chat-welcome h2 { font-size: clamp(34px, 3.2vw, 51px); line-height: 1.3; letter-spacing: -.06em; margin: 22px 0 16px; }
.chat-welcome p { color: #7a897d; font-size: 13px; line-height: 1.9; margin: 0; overflow-wrap: anywhere; }
.composer-wrap { width: min(900px, 90%); min-width: 0; margin: 0 auto 27px; }
.unavailable-note { display: flex; align-items: center; gap: 9px; background: #e7ede3; color: #5e775e; border: 1px solid #d6e2d2; padding: 12px 15px; border-radius: 10px 10px 0 0; font-size: 12px; }
.unavailable-note span { font-size: 17px; }
.chat-composer { display: flex; align-items: flex-end; gap: 12px; background: #fff; border: 1px solid #dce3d9; border-top: 0; padding: 14px 14px 14px 18px; border-radius: 0 0 13px 13px; box-shadow: 0 12px 35px rgba(27, 50, 34, .06); }
.chat-composer textarea { flex: 1; min-width: 0; border: 0; outline: 0; resize: none; min-height: 44px; max-height: 140px; background: transparent; color: var(--ink); font-size: 13px; line-height: 1.7; }
.chat-composer textarea::placeholder { color: #a2afa2; }
.chat-composer button { width: 39px; height: 39px; border: 0; border-radius: 10px; background: var(--forest); color: white; font-size: 23px; display: grid; place-items: center; }
.chat-composer button:hover { background: var(--forest-deep); }
.composer-footnote { text-align: center; margin-top: 12px; color: #9ba79a; font-size: 11px; }
.chat-message { width: min(700px, 100%); margin: 0 auto 15px; padding: 17px 20px; border-radius: 14px; font-size: 13px; line-height: 1.8; }
.chat-message.visitor { background: var(--forest); color: white; }
.chat-message.system { background: #e8eee4; color: #406449; }
.message-label { font-size: 10px; font-weight: 800; letter-spacing: .1em; opacity: .7; }
.chat-message p { margin: 7px 0 0; overflow-wrap: anywhere; }
.embed-content { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.embed-content iframe { flex: 1; min-height: 0; width: 100%; border: 0; background: white; }
.draft-banner { padding: 11px 4%; background: #e8efe3; border-bottom: 1px solid #d1e0d0; display: flex; align-items: center; gap: 13px; color: #56735b; font-size: 12px; }
.draft-banner strong { color: var(--forest); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.draft-banner button { margin-left: auto; flex: 0 0 auto; border: 1px solid #bbd0bb; color: var(--forest); background: transparent; border-radius: 7px; padding: 5px 10px; font-size: 11px; font-weight: 700; }

@media (max-width: 1050px) {
  .hero { grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); }
  .art-main-card { left: 7%; width: 86%; height: 390px; }
  .art-floating-card { right: -7%; }
}
@media (max-width: 820px) {
  .site-header { height: 76px; }
  .top-nav { gap: 15px; }
  .top-nav a:not(.nav-cta) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 45px; gap: 10px; }
  .hero-copy { padding-top: 20px; }
  .hero-art { min-height: 460px; max-width: 580px; width: 100%; margin: 0 auto; }
  .art-main-card { left: 12%; width: 70%; }
  .art-floating-card { right: 2%; }
  .explore-grid { grid-template-columns: 1fr; }
  .explore-card { min-height: 230px; }
  .card-glyph { height: 60px; line-height: 60px; }
  .principles-section { grid-template-columns: 1fr; gap: 50px; }
  .chat-shell { grid-template-columns: 1fr; }
  .chat-sidebar { padding: 14px 4%; display: block; }
  .chat-sidebar .brand { font-size: 15px; }
  .chat-sidebar .brand-mark { width: 25px; height: 25px; }
  .sidebar-inner, .sidebar-footer { display: none; }
  .chat-main { height: calc(100vh - 57px); }
  .chat-header { height: 66px; flex-basis: 66px; }
}
@media (max-width: 560px) {
  .site-header { padding: 0 5%; }
  .brand { font-size: 16px; }
  .nav-cta { padding: 10px 12px; gap: 7px; font-size: 11px; }
  .hero { padding: 46px 5% 55px; }
  .hero h1 { font-size: 41px; margin-top: 26px; }
  .hero-intro { font-size: 14px; }
  .question-form { display: grid; grid-template-columns: 20px 1fr; }
  .question-form button { grid-column: 1 / -1; }
  .hero-art { min-height: 355px; }
  .art-main-card { top: 20px; left: 8%; width: 77%; height: 310px; padding: 22px; }
  .art-quote { margin-top: 55px; font-size: 27px; }
  .art-card-bottom { left: 22px; right: 22px; }
  .art-floating-card { right: 0; bottom: 18px; padding: 12px; }
  .art-caption, .art-index { display: none; }
  .preview-banner { grid-template-columns: 1fr; gap: 8px; padding: 17px 5%; }
  .preview-icon { display: none; }
  .explore-section { padding: 75px 5% 85px; }
  .section-heading { display: block; }
  .section-heading p { margin-top: 13px; }
  .principles-section { padding: 75px 5%; }
  .site-footer { padding: 23px 5%; display: grid; }
  .chat-header { padding: 0 5%; }
  .chat-welcome { margin-top: max(34px, 6vh); }
  .composer-wrap { width: 92%; margin-bottom: 16px; }
  .composer-footnote { font-size: 10px; }
  .draft-banner { flex-wrap: wrap; }
  .draft-banner strong { max-width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}