:root { --af-blue: #1769e8; --af-blue-deep: #0e55c7; --af-ink: #17243a; --af-muted: #60708a; --af-line: #dce6f4; --af-surface: #f5f8fd; --af-radius: 16px; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--af-ink); background: #fff; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; line-height: 1.65; }
body.purchase-modal-open { overflow: hidden; }
a, button { -webkit-tap-highlight-color: transparent; }
.site-nav, main, .page-footer { width: min(100% - 40px, 1120px); margin: 0 auto; }
.site-nav { min-height: 70px; display: flex; align-items: center; gap: 22px; }
.brand { color: var(--af-ink); font-size: 18px; font-weight: 780; letter-spacing: -.03em; text-decoration: none; white-space: nowrap; }
.site-nav nav { display: flex; align-items: center; gap: 20px; margin-left: auto; }
.site-nav nav a, .nav-link { padding: 6px 0; border: 0; color: #53637b; background: transparent; font: inherit; font-size: 14px; font-weight: 650; text-decoration: none; cursor: pointer; white-space: nowrap; }
.site-nav nav a:hover, .nav-link:hover, .page-footer a:hover { color: var(--af-blue); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border: 1px solid transparent; border-radius: 10px; font: inherit; font-size: 14px; font-weight: 740; line-height: 1; text-decoration: none; white-space: nowrap; cursor: pointer; transition: background-color .16s ease, border-color .16s ease, color .16s ease, transform .16s ease; }
.button:focus-visible, .nav-link:focus-visible, .site-nav a:focus-visible, summary:focus-visible, .dialog-close:focus-visible { outline: 3px solid rgba(23, 105, 232, .28); outline-offset: 3px; }
.button:active { transform: translateY(1px); }
.button-primary { color: #fff; background: var(--af-blue); box-shadow: 0 6px 18px rgba(23, 105, 232, .14); }
.button-primary:hover { background: var(--af-blue-deep); }
.button-secondary { color: var(--af-blue); border-color: #bcd2f5; background: #fff; }
.button-secondary:hover { border-color: #8eb6ef; background: #f7faff; }
.nav-cta { margin-left: 3px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr); gap: clamp(42px, 8vw, 94px); align-items: center; padding: 82px 0 88px; }
.section-kicker { margin: 0 0 12px; color: var(--af-blue); font-size: 13px; font-weight: 760; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 690px; margin-bottom: 20px; color: #10213a; font-size: clamp(38px, 5vw, 60px); letter-spacing: -.055em; line-height: 1.12; }
.hero-lead { max-width: 610px; margin-bottom: 0; color: var(--af-muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 28px; }
.prompt-panel { overflow: hidden; border: 1px solid #cfe0f8; border-radius: var(--af-radius); background: #fff; box-shadow: 0 20px 44px rgba(38, 79, 133, .1); }
.prompt-panel-head { display: flex; align-items: center; justify-content: space-between; padding: 13px 18px; border-bottom: 1px solid #e5edf8; color: #425978; font-size: 13px; font-weight: 720; }
.prompt-panel-status { color: #6d83a0; font-weight: 600; }
.prompt-row { display: grid; grid-template-columns: 38px 1fr; gap: 12px; padding: 18px; }
.prompt-row > span { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 10px; font-size: 12px; font-weight: 760; }
.prompt-row p { margin: 2px 0 0; font-size: 15px; }
.prompt-user { background: #fbfdff; }
.prompt-user > span { color: #1d5ebc; background: #e6f0ff; }
.prompt-agent { padding-bottom: 15px; }
.prompt-agent > span { color: #fff; background: var(--af-blue); }
.prompt-agent p { position: relative; padding-left: 16px; color: #4c607d; font-size: 14px; line-height: 1.9; }
.prompt-agent p::before { content: ""; position: absolute; top: .75em; left: 0; width: 6px; height: 6px; border: 1.5px solid #3b80de; border-radius: 50%; }
.prompt-result { display: grid; gap: 5px; margin: 0 18px 18px 68px; padding: 14px; border-radius: 12px; color: #185cae; background: #edf6ff; }
.prompt-result strong { font-size: 14px; }
.prompt-result code { overflow-wrap: anywhere; color: #1c67bd; font-size: 13px; }
.section { padding: 88px 0; }
.section-heading { max-width: 650px; }
h2 { margin-bottom: 12px; color: #13233b; font-size: clamp(27px, 3.1vw, 38px); letter-spacing: -.04em; line-height: 1.2; }
.section-heading > p, .purchase-section > div > p:not(.section-kicker) { margin-bottom: 0; color: var(--af-muted); font-size: 16px; }
.steps-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; padding: 0; margin: 38px 0 0; list-style: none; }
.steps-list li { min-height: 208px; padding: 25px; border-top: 2px solid #b9d2f8; background: var(--af-surface); }
.steps-list span { display: block; margin-bottom: 28px; color: var(--af-blue); font-size: 15px; font-weight: 760; }
.steps-list h3, .upgrade-directions h3 { margin-bottom: 8px; font-size: 19px; letter-spacing: -.025em; }
.steps-list p, .upgrade-directions p { margin-bottom: 0; color: var(--af-muted); font-size: 14px; }
.support-note { display: grid; grid-template-columns: auto 1fr; gap: 7px 15px; margin-top: 24px; padding: 17px 0; border-top: 1px solid var(--af-line); border-bottom: 1px solid var(--af-line); color: #5d6d85; font-size: 14px; }
.support-note strong { color: #324662; }
.allowance-section { padding-top: 28px; }
.allowance-card { display: grid; grid-template-columns: minmax(260px, .76fr) minmax(0, 1.24fr); gap: 44px; align-items: center; padding: 42px 46px; border: 1px solid #cfe0f8; border-radius: var(--af-radius); background: #f4f8ff; }
.allowance-card h2 { margin-bottom: 8px; }
.allowance-lead { margin: 0; color: #285b97; font-size: 18px; font-weight: 720; }
.allowance-card ul { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; color: #4b6180; font-size: 15px; }
.allowance-card li { position: relative; padding-left: 19px; }
.allowance-card li::before { content: ""; position: absolute; top: .65em; left: 0; width: 7px; height: 7px; border: 1.5px solid var(--af-blue); border-radius: 50%; }
.allowance-card strong { color: #174f9e; }
.upgrade-section { padding-bottom: 72px; }
.upgrade-directions { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 0; margin-top: 38px; border-top: 1px solid var(--af-line); border-bottom: 1px solid var(--af-line); }
.upgrade-directions article { min-height: 158px; padding: 28px 26px; border-right: 1px solid var(--af-line); }
.upgrade-directions article:first-child { padding-left: 0; }
.upgrade-directions article:last-child { border: 0; }
.purchase-section { display: flex; align-items: center; justify-content: space-between; gap: 35px; padding: 49px 54px; border-radius: var(--af-radius); color: #fff; background: #145fcf; }
.purchase-section h2 { margin-bottom: 10px; color: #fff; }
.purchase-section .section-kicker { color: #dcecff; }
.purchase-section > div > p:not(.section-kicker) { color: #e0edff; }
.configured-price { display: flex; align-items: baseline; gap: 7px; margin: 18px 0 0; color: #fff !important; }
.configured-price strong { font-size: 28px; line-height: 1; letter-spacing: -.03em; }
.configured-price span { color: #e0edff; font-size: 14px; }
.configured-benefits { display: flex; flex-wrap: wrap; gap: 7px 14px; padding: 0; margin: 17px 0 0; list-style: none; color: #e0edff; font-size: 13px; }
.configured-benefits li { position: relative; padding-left: 12px; }
.configured-benefits li::before { content: ""; position: absolute; top: .62em; left: 0; width: 5px; height: 5px; border: 1px solid #dcecff; border-radius: 50%; }
.purchase-cta { flex: 0 0 auto; color: #145fcf; background: #fff; box-shadow: none; }
.purchase-cta:hover { color: #0d53bc; background: #f3f8ff; }
.faq-section { padding-bottom: 58px; }
.faq-list { margin-top: 30px; border-top: 1px solid var(--af-line); }
.faq-list details { border-bottom: 1px solid var(--af-line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 4px; color: #233752; font-size: 16px; font-weight: 700; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; color: var(--af-blue); font-size: 22px; font-weight: 420; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 650px; margin: -4px 4px 20px; color: var(--af-muted); font-size: 15px; }
.page-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 25px 0 36px; border-top: 1px solid var(--af-line); color: #75849a; font-size: 13px; }
.page-footer a { color: #60708a; font-weight: 650; text-decoration: none; }
.purchase-modal[hidden] { display: none; }
.purchase-modal { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; padding: 22px; }
.purchase-modal-backdrop { position: absolute; inset: 0; background: rgba(16, 35, 62, .42); }
.purchase-dialog { position: relative; width: min(100%, 390px); max-height: min(720px, calc(100dvh - 44px)); overflow-y: auto; padding: 35px; border-radius: var(--af-radius); background: #fff; box-shadow: 0 18px 60px rgba(15, 39, 75, .26); }
.purchase-dialog h2 { font-size: 28px; }
.dialog-close { position: absolute; top: 14px; right: 14px; padding: 6px; border: 0; color: #5e708b; background: transparent; font: inherit; font-size: 13px; cursor: pointer; }
.dialog-close:hover { color: var(--af-blue); }
.wechat-qr, .wechat-qr-placeholder { display: block; width: min(100%, 220px); aspect-ratio: 1; margin: 24px auto 18px; border: 1px solid var(--af-line); border-radius: 12px; object-fit: cover; }
.wechat-qr-placeholder { display: grid; place-items: center; padding: 20px; color: #65758c; background: var(--af-surface); font-size: 14px; text-align: center; }
.wechat-id-label { margin: 0; color: #728197; font-size: 13px; text-align: center; }
.wechat-id { margin: 2px 0 17px; color: #1c2e49; font-size: 19px; font-weight: 750; letter-spacing: .02em; text-align: center; }
.copy-wechat { width: 100%; }
.dialog-note { margin: 18px 0 0; color: #74839a; font-size: 13px; text-align: center; }
@media (max-width: 800px) { .site-nav, main, .page-footer { width: min(100% - 28px, 1120px); }.site-nav { min-height: 64px; gap: 13px; }.site-nav nav { display: none; }.nav-cta { margin-left: auto; min-height: 40px; padding: 0 13px; font-size: 13px; }.hero { grid-template-columns: 1fr; gap: 38px; padding: 57px 0 65px; }.hero-copy { max-width: 630px; }.prompt-panel { max-width: 620px; }.section { padding: 67px 0; }.steps-list { gap: 12px; }.steps-list li { min-height: 0; padding: 21px; }.steps-list span { margin-bottom: 20px; }.allowance-card { grid-template-columns: 1fr; gap: 25px; padding: 32px; }.upgrade-directions article { padding: 23px 18px; }.purchase-section { padding: 39px 34px; } }
@media (max-width: 580px) { .site-nav, main, .page-footer { width: min(100% - 24px, 1120px); }.brand { font-size: 16px; }.nav-cta { padding: 0 11px; font-size: 12px; }.hero { padding-top: 46px; }.section-kicker { margin-bottom: 9px; }.hero-lead { font-size: 16px; }.hero-actions { display: grid; grid-template-columns: 1fr; }.hero-actions .button { width: 100%; }.prompt-row { padding: 15px; }.prompt-result { margin-right: 15px; margin-bottom: 15px; margin-left: 57px; }.section { padding: 54px 0; }.steps-list { grid-template-columns: 1fr; margin-top: 28px; }.steps-list li { min-height: 146px; }.support-note { grid-template-columns: 1fr; gap: 4px; font-size: 13px; }.support-note strong:not(:first-child) { margin-top: 9px; }.allowance-section { padding-top: 12px; }.allowance-card { padding: 27px 22px; border-radius: 14px; }.allowance-card ul { gap: 9px; font-size: 14px; }.upgrade-section { padding-bottom: 48px; }.upgrade-directions { grid-template-columns: 1fr; margin-top: 27px; }.upgrade-directions article, .upgrade-directions article:first-child { min-height: 0; padding: 20px 0; border-right: 0; border-bottom: 1px solid var(--af-line); }.upgrade-directions article:last-child { border-bottom: 0; }.purchase-section { align-items: flex-start; flex-direction: column; gap: 23px; padding: 30px 24px; border-radius: 14px; }.purchase-cta { width: 100%; }.faq-section { padding-bottom: 42px; }.faq-list { margin-top: 20px; }.faq-list summary { padding: 17px 0; }.page-footer { align-items: flex-start; flex-direction: column; gap: 7px; padding-bottom: 28px; }.purchase-modal { align-items: end; padding: 0; }.purchase-dialog { width: 100%; max-height: min(720px, 90dvh); padding: 30px 24px calc(30px + env(safe-area-inset-bottom)); border-radius: 16px 16px 0 0; }.wechat-qr, .wechat-qr-placeholder { width: min(100%, 210px); } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; }.button { transition: none; } }