:root {
    --paper: #f7f4ee;
    --ink: #151515;
    --muted: #66645f;
    --rule: #cbc7be;
    --vermilion: #d5211d;
    --vermilion-dark: #b71916;
    --indigo: #1553a3;
    --dark: #171817;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--indigo); outline-offset: 4px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .65rem 1rem; background: var(--ink); color: white; }
.skip-link:focus { top: 1rem; }

.keli-header { position: relative; border-bottom: 1px solid var(--rule); background: rgba(247,244,238,.95); z-index: 20; }
.keli-header__inner { width: min(100% - 48px, 1360px); min-height: 84px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.keli-brand { display: inline-flex; align-items: baseline; gap: 12px; white-space: nowrap; }
.keli-brand__cn { font-family: "Songti SC", SimSun, serif; font-size: 1.45rem; font-weight: 700; letter-spacing: .08em; }
.keli-brand__geo { font-family: Georgia, serif; font-size: 1.35rem; letter-spacing: .08em; }
.keli-nav { display: flex; align-items: center; gap: clamp(22px, 3vw, 46px); margin-left: auto; }
.keli-nav a, .keli-account { position: relative; min-height: 44px; display: inline-flex; align-items: center; color: #383733; font-size: .9rem; letter-spacing: .08em; }
.keli-nav a::after { content: ""; position: absolute; left: 0; bottom: 5px; width: 0; height: 1px; background: var(--vermilion); transition: width .2s ease; }
.keli-nav a:hover::after { width: 100%; }
.keli-header__actions { display: flex; align-items: center; gap: 18px; }
.keli-account { border-left: 1px solid var(--rule); padding-left: 26px; }
.keli-menu-button { display: none; width: 46px; height: 46px; border: 0; background: transparent; padding: 9px; cursor: pointer; }
.keli-menu-button span { display: block; height: 2px; margin: 6px 0; background: var(--ink); }
.keli-mobile-nav { padding: 12px 24px 24px; border-top: 1px solid var(--rule); }
.keli-mobile-nav a { min-height: 48px; display: flex; align-items: center; border-bottom: 1px solid var(--rule); font-weight: 600; }

.keli-visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.keli-hero { width: min(100% - 48px, 1360px); min-height: 700px; margin: auto; padding: clamp(72px, 9vw, 138px) 0 92px; display: grid; grid-template-columns: minmax(0, 1fr) 96px; gap: clamp(42px, 7vw, 108px); align-items: stretch; }
.keli-hero__main { min-width: 0; display: flex; flex-direction: column; justify-content: center; }
.keli-hero__copy { max-width: 920px; }
.keli-hero__aside { min-height: 480px; border-left: 1px solid #8d8981; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 42px; }
.keli-hero__aside p { margin: 0; color: #4f4c46; font-family: "Songti SC", STSong, SimSun, serif; font-size: .84rem; letter-spacing: .24em; line-height: 1.6; writing-mode: vertical-rl; text-orientation: mixed; }
.keli-hero__aside img { width: 32px; height: 32px; object-fit: cover; }
.keli-kicker { margin: 0 0 30px; display: flex; align-items: center; gap: 13px; color: var(--muted); font-size: .7rem; font-weight: 700; letter-spacing: .18em; }
.keli-kicker span { width: 28px; height: 2px; background: var(--vermilion); }
.keli-hero h1 { max-width: 840px; margin: 0; font-family: "Songti SC", STSong, SimSun, serif; font-size: clamp(4rem, 5.8vw, 6.2rem); font-weight: 500; letter-spacing: -.055em; line-height: 1.08; }
.keli-hero h1 span { display: block; width: max-content; max-width: 100%; white-space: nowrap; font-size: .86em; }
.keli-hero h1::before { content: ""; display: inline-block; width: 4px; height: .72em; margin: 0 .28em .04em 0; background: var(--vermilion); }
.keli-hero__lead { max-width: 760px; margin: 42px 0 0 38px; color: var(--muted); font-size: clamp(1rem, 1.3vw, 1.18rem); line-height: 2; }
.keli-diagnostic-form { width: min(100%, 820px); margin: 70px 0 0 38px; }
.keli-diagnostic-form > label { display: block; margin-bottom: 15px; font-weight: 700; letter-spacing: .04em; }
.keli-diagnostic-form__row { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: 0; }
.keli-url-field { min-height: 66px; border: 1px solid #77736c; display: flex; align-items: center; gap: 14px; padding: 0 20px; background: rgba(255,255,255,.35); }
.keli-url-field:focus-within { border-color: var(--indigo); box-shadow: 0 0 0 1px var(--indigo); }
.keli-url-field svg { width: 22px; fill: none; stroke: #79766f; stroke-width: 1.4; flex: none; }
.keli-url-field input { width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 1rem; }
.keli-diagnostic-form button { min-height: 66px; border: 0; background: var(--vermilion); color: white; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; font-weight: 700; letter-spacing: .04em; cursor: pointer; transition: background .2s ease, transform .2s ease; }
.keli-diagnostic-form button:hover { background: var(--vermilion-dark); }
.keli-diagnostic-form button:active { transform: translateY(1px); }
.keli-diagnostic-form button span { font-size: 1.75rem; font-weight: 300; }
.keli-form-note { margin: 18px 0 0; color: var(--muted); font-size: .78rem; }
.keli-form-note span { color: var(--indigo); margin-right: 8px; }

.keli-method { width: min(100% - 48px, 1360px); margin: auto; padding: 108px 0 124px; border-top: 1px solid var(--rule); display: grid; grid-template-columns: minmax(260px, .65fr) minmax(0, 1.35fr); gap: clamp(60px, 9vw, 150px); }
.keli-section-heading > p { margin: 0 0 25px; color: var(--indigo); font-size: .7rem; font-weight: 700; letter-spacing: .18em; }
.keli-section-heading h2 { margin: 0; font-family: "Songti SC", STSong, SimSun, serif; font-size: clamp(2rem, 3.4vw, 3.6rem); font-weight: 500; line-height: 1.35; letter-spacing: -.025em; }
.keli-steps { margin: 0; padding: 0; list-style: none; counter-reset: steps; }
.keli-steps li { min-height: 185px; display: grid; grid-template-columns: 150px 1fr; gap: 42px; padding: 8px 0 38px; border-bottom: 1px solid var(--rule); position: relative; }
.keli-steps li + li { padding-top: 38px; }
.keli-step__number { color: var(--indigo); font-family: Georgia, serif; font-size: clamp(3rem, 5vw, 5rem); line-height: 1; }
.keli-steps h3 { margin: 0 0 12px; font-family: "Songti SC", STSong, SimSun, serif; font-size: 2rem; font-weight: 600; }
.keli-steps p { max-width: 610px; margin: 0; color: var(--muted); line-height: 1.9; }

.keli-capabilities { background: var(--dark); color: #f5f1e9; padding: 112px max(24px, calc((100vw - 1360px)/2)); }
.keli-section-heading--light { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; margin-bottom: 75px; }
.keli-section-heading--light > p { color: #9daac1; }
.keli-capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #44443f; border-left: 1px solid #44443f; }
.keli-capability-grid a { min-height: 320px; padding: 30px; border-right: 1px solid #44443f; border-bottom: 1px solid #44443f; display: flex; flex-direction: column; position: relative; transition: background .2s ease; }
.keli-capability-grid a:hover { background: #202220; color: inherit; }
.keli-capability-grid span { color: #778ab0; font-family: Georgia, serif; }
.keli-capability-grid h3 { margin: auto 0 14px; font-family: "Songti SC", STSong, SimSun, serif; font-size: 1.75rem; }
.keli-capability-grid p { margin: 0; color: #aaa9a2; line-height: 1.8; font-size: .9rem; }
.keli-capability-grid b { position: absolute; right: 28px; top: 25px; font-size: 1.5rem; font-weight: 300; }

.keli-trust { width: min(100% - 48px, 1360px); margin: auto; padding: 120px 0; display: grid; grid-template-columns: .65fr 1.35fr; gap: clamp(60px, 9vw, 150px); }
.keli-trust h2 { margin: 0; font-family: "Songti SC", STSong, SimSun, serif; font-size: clamp(2.7rem, 5vw, 5.4rem); font-weight: 500; line-height: 1.2; letter-spacing: -.04em; }
.keli-trust > div > p { max-width: 720px; margin: 38px 0 0; color: var(--muted); line-height: 2; }
.keli-footer { width: min(100% - 48px, 1360px); margin: auto; padding: 50px 0 34px; border-top: 1px solid var(--rule); display: grid; grid-template-columns: 1fr 1fr auto; gap: 28px; align-items: center; }
.keli-footer > p { margin: 0; color: var(--muted); font-size: .82rem; }
.keli-footer nav { display: flex; gap: 24px; font-size: .82rem; }
.keli-footer small { grid-column: 1 / -1; color: #85817a; }

@media (max-width: 1040px) {
    .keli-nav { display: none; }
    .keli-menu-button { display: block; }
    .keli-account { display: none; }
    .keli-hero { grid-template-columns: 1fr; min-height: auto; }
    .keli-hero__aside { min-height: auto; padding: 26px 0 0; border-left: 0; border-top: 1px solid var(--rule); flex-direction: row; justify-content: flex-start; gap: 24px; }
    .keli-hero__aside p { writing-mode: horizontal-tb; letter-spacing: .12em; }
    .keli-hero__aside img { width: 28px; height: 28px; }
    .keli-diagnostic-form { max-width: 680px; }
    .keli-capability-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
    body { font-size: 15px; }
    .keli-header__inner { width: calc(100% - 32px); min-height: 76px; }
    .keli-brand { gap: 8px; }
    .keli-brand__cn { font-size: 1.2rem; }
    .keli-brand__geo { font-size: 1.1rem; }
    .keli-hero, .keli-method, .keli-trust, .keli-footer { width: calc(100% - 32px); }
    .keli-hero { padding: 72px 0 80px; gap: 50px; }
    .keli-kicker { margin-bottom: 24px; font-size: .62rem; }
    .keli-hero h1 { font-size: clamp(3.45rem, 17vw, 5rem); line-height: 1.16; }
    .keli-hero h1 span { width: auto; white-space: normal; font-size: 1em; }
    .keli-hero h1::before { width: 3px; margin-right: .2em; }
    .keli-hero__lead { margin: 34px 0 0 22px; font-size: 1rem; line-height: 1.9; }
    .keli-diagnostic-form { margin: 54px 0 0 22px; width: calc(100% - 22px); }
    .keli-diagnostic-form__row { grid-template-columns: 1fr; gap: 10px; }
    .keli-url-field, .keli-diagnostic-form button { min-height: 60px; }
    .keli-method { padding: 78px 0 92px; grid-template-columns: 1fr; gap: 58px; }
    .keli-section-heading h2 { font-size: 2.35rem; }
    .keli-steps li { min-height: 150px; grid-template-columns: 96px 1fr; gap: 26px; padding-bottom: 30px; }
    .keli-steps li + li { padding-top: 30px; }
    .keli-step__number { font-size: 3.5rem; }
    .keli-steps h3 { font-size: 1.55rem; }
    .keli-capabilities { padding: 78px 16px; }
    .keli-section-heading--light { grid-template-columns: 1fr; gap: 16px; margin-bottom: 48px; }
    .keli-capability-grid { grid-template-columns: 1fr; }
    .keli-capability-grid a { min-height: 230px; }
    .keli-trust { padding: 86px 0; grid-template-columns: 1fr; gap: 28px; }
    .keli-trust h2 { font-size: 3rem; }
    .keli-footer { padding-top: 38px; grid-template-columns: 1fr; }
    .keli-footer nav { flex-wrap: wrap; }
    .keli-footer small { grid-column: 1; }
}

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