:root { color-scheme: light; --paper: #f5f4f0; --ink: #252b2a; --muted: #69716d; --line: #d9dcd6; --accent: #345f5b; --soft: #e9eeea; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
button { font: inherit; cursor: pointer; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.page { width: min(100% - 40px, 760px); min-height: 100svh; margin: auto; display: flex; flex-direction: column; }
.header { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 31px 0 27px; border-bottom: 1px solid var(--line); }
.brand, .section-label, .eyebrow, .path-number, .path-next-label, .conversation-top, .topic-kicker, .assist-label, .assist-result-label, .footer { letter-spacing: .13em; font-size: 11px; font-weight: 600; }
.brand { white-space: nowrap; }.brand-mark { color: var(--accent); font-size: 17px; vertical-align: -2px; margin-right: 7px; }.section-label { color: var(--muted); white-space: nowrap; }.section-label span { padding: 0 4px; color: #afb5ad; }
.intro { padding: clamp(50px, 9vw, 91px) 0 42px; }.eyebrow { color: var(--accent); text-transform: uppercase; margin: 0 0 25px; }.intro h1 { margin: 0; font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif; font-size: clamp(33px, 5.2vw, 49px); line-height: 1.48; letter-spacing: .04em; font-weight: 500; }.intro-copy { margin: 24px 0 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.paths { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; margin-bottom: 26px; }.path { min-height: 76px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; text-align: left; gap: 14px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 2px; background: transparent; color: var(--ink); }.path-active { border-color: #b7c8bd; background: var(--soft); }.path:hover { border-color: #aebfb2; }.path-number { color: var(--accent); }.path-title { font-size: 15px; font-weight: 550; }.path-arrow { font-size: 18px; color: var(--accent); }
.conversation { background: #fff; border: 1px solid #e3e6e0; padding: clamp(23px, 4vw, 37px); box-shadow: 0 8px 35px rgba(35, 47, 38, .025); }.conversation-top { display: flex; justify-content: space-between; color: var(--muted); }.asterisk { color: var(--accent); font-size: 18px; line-height: .7; }.topic-area { min-height: 197px; display: flex; flex-direction: column; justify-content: center; padding: 20px 0; }.topic-kicker { color: var(--accent); margin: 0 0 18px; }.topic-area h2 { margin: 0; font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif; font-weight: 500; font-size: clamp(23px, 3.8vw, 32px); line-height: 1.55; letter-spacing: .02em; max-width: 620px; }.conversation-actions { display: flex; align-items: center; gap: 22px; }.primary-button { min-height: 47px; display: flex; align-items: center; justify-content: space-between; gap: 36px; padding: 11px 19px; border: 1px solid var(--accent); background: var(--accent); color: white; font-size: 14px; }.primary-button:hover { background: #254a47; }.primary-button span { font-size: 18px; }.text-button { border: 0; background: none; padding: 10px 0; color: var(--accent); font-size: 13px; }.text-button:hover { text-decoration: underline; }
.hairline { border-top: 1px solid var(--line); margin: 28px 0 22px; }.assist-label { color: var(--muted); margin: 0 0 14px; }.assist-buttons { display: flex; flex-wrap: wrap; gap: 9px; }.assist-button { min-height: 40px; border: 1px solid #cbd5cd; background: #f8faf7; color: var(--accent); padding: 8px 13px; font-size: 13px; }.assist-button:hover { background: var(--soft); }.assist-button:disabled { cursor: wait; opacity: .6; }.assist-button span { margin-left: 12px; }.assist-result { border-left: 2px solid #b7c8bd; margin-top: 21px; padding: 2px 0 2px 17px; }.assist-result-label { color: var(--accent); margin: 0 0 10px; }.assist-result-text { margin: 0; font-size: 16px; line-height: 1.75; }.mode-note { margin: 20px 0 0; color: #858c86; font-size: 12px; line-height: 1.7; }.footer { margin-top: auto; display: flex; justify-content: space-between; gap: 15px; padding: 35px 0 25px; color: #929b94; font-size: 10px; }
.content-area { min-height: 310px; padding: 34px 0 26px; }.content-status { color: var(--muted); font-size: 11px; letter-spacing: .12em; margin: 0 0 20px; }.content-area h2 { margin: 0; font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif; font-size: clamp(23px, 3.8vw, 32px); line-height: 1.5; font-weight: 500; overflow-wrap: anywhere; }.content-source { margin: 11px 0 0; color: var(--muted); font-size: 12px; }.content-description { margin: 24px 0; color: #4d5751; font-size: 14px; line-height: 1.8; }.content-question { border-top: 1px solid var(--line); padding-top: 17px; }.content-question span { color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .12em; }.content-question p { margin: 9px 0 0; font-size: 15px; line-height: 1.7; }.content-open { color: var(--accent); font-size: 13px; text-decoration: none; white-space: nowrap; }.content-open:hover { text-decoration: underline; }.content-open:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.access-area { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }.access-area label { display: block; margin-bottom: 8px; color: var(--accent); font-size: 12px; font-weight: 600; letter-spacing: .08em; }.access-controls { display: flex; flex-wrap: wrap; gap: 9px; }.access-area input { width: min(100%, 300px); min-height: 42px; border: 1px solid #cbd5cd; border-radius: 0; background: #fff; color: var(--ink); padding: 9px 12px; font: inherit; font-size: 14px; }.access-area input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }.access-area p { margin: 8px 0 0; color: #858c86; font-size: 12px; line-height: 1.6; }
[hidden] { display: none !important; }
@media (max-width: 600px) { .page { width: min(100% - 32px, 760px); }.header { padding: 23px 0; }.brand { font-size: 9px; }.section-label { font-size: 9px; }.intro { padding: 55px 0 31px; }.intro-copy { font-size: 14px; }.paths { gap: 9px; }.path { min-height: 80px; gap: 8px; padding: 13px; grid-template-columns: 1fr auto; }.path-number { grid-column: 1 / -1; }.path-title { font-size: 13px; }.conversation { padding: 22px; }.topic-area { min-height: 180px; }.content-area { min-height: 340px; padding-top: 27px; }.conversation-actions { gap: 15px; flex-wrap: wrap; }.primary-button { gap: 15px; }.footer { flex-direction: column; gap: 7px; padding-top: 29px; } }
@media (prefers-reduced-motion: no-preference) { .path, .primary-button, .assist-button { transition: background-color .18s ease, border-color .18s ease; } }