:root {
    color-scheme: light;
    --paper: #f7f8f2;
    --ink: #273f35;
    --green: #315647;
    --muted: #69756d;
    --line: #dfe5d9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.page { max-width: 1200px; min-height: 100vh; margin: auto; padding: 0 48px; display: flex; flex-direction: column; }
.header { min-height: 114px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 17px; font-weight: 650; letter-spacing: 2px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; background: var(--green); color: var(--paper); font-size: 33px; line-height: 1; }
.brand-caption { display: block; margin-top: 5px; color: var(--muted); font-size: 9px; font-weight: 500; letter-spacing: 1.6px; }
.header-note { color: var(--muted); font-size: 12px; letter-spacing: 1px; }
main { flex: 1; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: center; min-height: 550px; padding: 62px 0; }
.eyebrow { margin: 0 0 26px; display: flex; align-items: center; gap: 9px; font-size: 11px; font-weight: 650; letter-spacing: 2px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #719365; }
h1 { margin: 0; font-size: clamp(36px, 4.1vw, 54px); font-weight: 650; letter-spacing: -1.8px; line-height: 1.45; }
.accent { color: #63835a; }
.description { margin: 22px 0 28px; color: var(--muted); font-size: 15px; line-height: 1.95; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 32px; padding: 12px 23px; border: 1px solid var(--green); border-radius: 8px; background: var(--green); color: #fff; font-size: 14px; transition: background .2s, transform .2s; }
.button span { font-size: 21px; line-height: 1; }
.button:hover { background: #234034; transform: translateY(-2px); }
a:focus-visible { outline: 3px solid #63835a; outline-offset: 5px; }
.button-note { margin: 13px 0 0; color: var(--muted); font-size: 11px; }
.illustration { position: relative; min-width: 0; height: 390px; display: grid; place-items: center; isolation: isolate; }
.orbit { position: absolute; border: 1px solid #dce4d4; border-radius: 50%; z-index: -1; }
.orbit-one { width: 350px; height: 350px; background: #eff2e7; }
.orbit-two { width: 410px; height: 290px; transform: rotate(-30deg); }
.art-card { width: 265px; height: 315px; border: 1px solid #d8e0d0; border-radius: 16px; background: #fcfdf8; box-shadow: 0 20px 40px #334c3510; transform: rotate(-6deg); text-align: center; }
.art-card-top { height: 34px; display: flex; align-items: center; gap: 5px; padding-left: 15px; border-bottom: 1px solid #e5e9de; }
.art-card-top span { width: 5px; height: 5px; border-radius: 50%; background: #d2dbc9; }
.sprout { display: block; width: 220px; height: 196px; margin: 0 auto; }
.art-card p { margin: 6px 0 10px; font-size: 16px; font-weight: 500; letter-spacing: 1px; }
.art-card > span { color: var(--muted); font-size: 8px; letter-spacing: 1.5px; }
.spark { position: absolute; color: #709063; }
.spark-one { top: 20px; right: 29px; font-size: 44px; }
.spark-two { bottom: 42px; left: 20px; font-size: 35px; }
.art-label { position: absolute; bottom: 24px; right: 5px; padding: 13px 18px; background: #e3ecd7; border: 1px solid #d4dfc7; border-radius: 7px; transform: rotate(5deg); font-size: 12px; letter-spacing: 1px; }
.error-code { margin: 26px 0 0; font-size: 104px; line-height: 1.15; font-weight: 650; letter-spacing: -7px; color: var(--green); }
.error-path { display: block; width: 210px; height: 47px; margin: 0 auto 4px; }
.welcome-strip { display: flex; align-items: center; gap: 20px; padding: 27px 30px; border: 1px solid var(--line); border-radius: 12px; background: #f0f3e9; scroll-margin-top: 24px; }
.strip-icon { display: grid; place-items: center; flex-shrink: 0; width: 40px; height: 40px; border: 1px solid #ccd8c4; border-radius: 50%; font-size: 24px; }
.welcome-strip h2 { margin: 0 0 8px; font-size: 15px; font-weight: 550; }
.welcome-strip p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.strip-label { margin-left: auto; color: var(--muted); font-size: 9px; letter-spacing: 1.5px; white-space: nowrap; }
.footer { display: flex; justify-content: space-between; gap: 18px; padding: 35px 0 28px; color: var(--muted); font-size: 10px; letter-spacing: .6px; }
.footer > span:last-child { font-size: 9px; letter-spacing: 1.4px; }
.footer > span:last-child span { margin-left: 8px; font-size: 15px; }

@media (min-width: 1440px) {
    .hero { min-height: 620px; }
}
@media (max-width: 900px) {
    .page { padding: 0 28px; }
    .hero { gap: 16px; }
    .orbit-one { width: 290px; height: 290px; }
    .orbit-two { width: 310px; height: 240px; }
    .art-card { width: 240px; }
    .strip-label { display: none; }
}
@media (max-width: 640px) {
    .page { padding: 0 22px; }
    .header { min-height: 87px; }
    .header-note { display: none; }
    .hero { grid-template-columns: 1fr; gap: 12px; padding: 42px 0 24px; }
    .hero-copy { text-align: center; }
    .eyebrow { justify-content: center; margin-bottom: 20px; font-size: 10px; }
    h1 { font-size: clamp(32px, 8.8vw, 46px); letter-spacing: -1px; }
    .description { font-size: 14px; margin: 18px 0 24px; }
    .illustration { width: 100%; max-width: 330px; height: 350px; margin: 12px auto 0; }
    .orbit-one { width: 270px; height: 270px; }
    .orbit-two { width: 275px; height: 230px; }
    .art-card { width: 224px; height: 284px; }
    .sprout { height: 172px; }
    .error-code { margin-top: 18px; font-size: 94px; }
    .error-path { height: 39px; }
    .spark-one { right: 0; top: 5px; }
    .spark-two { left: 0; }
    .art-label { right: 0; bottom: 14px; }
    .welcome-strip { gap: 13px; padding: 21px 16px; }
    .welcome-strip h2 { font-size: 13px; line-height: 1.6; }
    .strip-icon { width: 30px; height: 30px; font-size: 20px; }
    .footer { flex-direction: column; align-items: center; gap: 10px; text-align: center; padding: 25px 0; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .button { transition: none; }
}