/* 溯川官网：由新 Logo 延展的冰蓝／雾蓝主题。App 主题须另行确认后接入。 */
:root {
  color-scheme: only light;
  --brand-paper: #F1F3F7;
  --brand-blue: #8EABC9;
  --brand-ice: #D0E7F5;
  --brand-silver: #D2E1EC;
  --brand-navy: #13223E;
  --brand-steel: #41536E;
  --paper: #F5F8FC;
  --surface: #FFFFFF;
  --surface-soft: #EAF2F9;
  --ink: #26384B;
  --muted: #4C6177;
  --accent: #435F7D;
  --primary: #789CBF;
  --primary-hover: #88AACA;
  --on-primary: #122D48;
  --line: rgb(104 137 170 / 13%);
  --shadow: 0 20px 65px -28px rgb(73 105 138 / 25%), 0 4px 14px -7px rgb(73 105 138 / 12%);
  --shadow-small: 0 7px 24px -10px rgb(73 105 138 / 18%);
  --radius: 28px;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 120px; }
body { margin: 0; isolation: isolate; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
button, summary { cursor: pointer; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p { margin: 0; }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }
::selection { background: var(--brand-ice); color: var(--on-primary); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
.shell { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.section-space { padding-block: 64px; }
.icon { width: 22px; height: 22px; display: inline-block; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.icon-definitions { position: absolute; width: 0; height: 0; overflow: hidden; }
.skip-link { position: fixed; z-index: 30; top: 10px; left: 16px; padding: 10px 18px; border-radius: 18px; background: var(--surface); transform: translateY(-180%); }
.skip-link:focus { transform: none; }

/* 只有背景色斑移动；白色阅读层与内容位置保持稳定。 */
.aurora { position: fixed; z-index: -1; inset: -8vmax; overflow: hidden; pointer-events: none; background: var(--paper); }
.aurora-blob { position: absolute; width: min(72vmax, 1000px); aspect-ratio: 1; border-radius: 50%; filter: blur(64px); will-change: transform, opacity; animation: river-breathe 24s ease-in-out infinite alternate; }
.aurora-blue { top: -28%; left: -24%; background: radial-gradient(circle, var(--brand-blue), transparent 68%); }
.aurora-ice { top: -10%; right: -27%; background: radial-gradient(circle, var(--brand-ice), transparent 70%); animation-duration: 29s; animation-delay: -7s; }
.aurora-silver { bottom: -37%; left: -12%; background: radial-gradient(circle, var(--brand-silver), transparent 66%); animation-duration: 26s; animation-delay: -12s; }
.aurora-mist { bottom: -24%; right: -30%; background: radial-gradient(circle, var(--brand-ice), transparent 68%); animation-duration: 31s; animation-delay: -17s; }
.aurora-sky { top: 18%; left: 33%; background: radial-gradient(circle, var(--brand-blue), transparent 70%); animation-duration: 28s; animation-delay: -9s; }
.aurora::after { content: ""; position: absolute; inset: 0; background: var(--paper); opacity: .64; }
.aurora[data-paused="true"] .aurora-blob { animation-play-state: paused; }
@keyframes river-breathe {
  0% { transform: translate3d(0, 0, 0) scale(.95); opacity: .4; }
  50% { transform: translate3d(6vw, 4vh, 0) scale(1.14); opacity: .6; }
  100% { transform: translate3d(-4vw, 7vh, 0) scale(1); opacity: .48; }
}

.site-header { position: sticky; z-index: 10; top: 16px; width: min(1160px, calc(100% - 48px)); min-height: 74px; margin: 18px auto 0; padding: 12px 22px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-radius: 26px; background: rgb(255 255 255 / 88%); box-shadow: var(--shadow-small), inset 0 1px 0 rgb(255 255 255 / 90%); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo { display: block; flex-shrink: 0; }
.brand > span { font-size: 20px; line-height: 1.4; font-weight: 600; letter-spacing: .5px; }
.brand small { display: block; margin-top: 2px; font-size: 9px; line-height: 1.5; font-weight: 400; color: var(--muted); }
.desktop-nav { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 13px; }
.desktop-nav a { padding-block: 10px; }
.desktop-nav a:hover, .footer-links a:hover { color: var(--accent); }
.header-contact { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 8px 18px; border-radius: 24px; background: var(--surface-soft); color: var(--accent); font-size: 12px; font-weight: 500; }
.header-contact .icon { width: 15px; height: 15px; }
.header-contact:hover { background: var(--brand-ice); }

.hero { display: flex; flex-direction: column; align-items: center; text-align: center; padding-block: 66px 76px; }
.hero-art { margin-bottom: 25px; }
.hero-logo { display: block; width: 124px; filter: drop-shadow(0 7px 10px rgb(70 109 149 / 14%)); }
.hero-logo img { width: 100%; height: auto; }
.hero-copy { max-width: 850px; min-width: 0; }
.eyebrow { color: var(--accent); font-size: 13px; font-weight: 500; letter-spacing: 1px; }
h1 { margin-block: 17px 23px; font-size: clamp(38px, 5.2vw, 62px); line-height: 1.3; font-weight: 650; letter-spacing: -1.5px; }
.accent-text { color: var(--accent); }
.hero-message { max-width: 560px; margin-inline: auto; padding-top: 3px; }
.hero-lead { font-size: clamp(19px, 2.1vw, 23px); line-height: 1.6; font-weight: 400; letter-spacing: .3px; }
.hero-lead strong { color: var(--accent); font-weight: 600; }
.hero-description { margin: 12px auto 0; font-size: 15px; line-height: 1.95; color: var(--muted); text-wrap: pretty; }
.hero-description > span { display: block; }
.hero-pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 37px; padding: 12px; border-radius: 28px; background: rgb(255 255 255 / 66%); box-shadow: var(--shadow-small); text-align: left; }
.hero-pillar { min-width: 0; display: block; padding: 15px 18px; border-radius: 20px; transition: background .2s; }
.hero-pillar:hover { background: var(--surface); }
.pillar-heading { display: flex; align-items: center; gap: 9px; color: var(--accent); }
.pillar-heading .icon { width: 18px; height: 18px; }
.pillar-heading strong { font-size: 15px; font-weight: 600; letter-spacing: .1px; }
.pillar-summary { display: block; margin-top: 9px; color: var(--muted); font-size: 12px; line-height: 1.85; }
.hero-actions { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 22px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 15px; min-height: 50px; padding: 12px 24px; border-radius: 100px; font-size: 14px; font-weight: 500; transition: background .2s, box-shadow .2s; }
.button.primary { background: var(--primary); color: var(--on-primary); box-shadow: 0 6px 18px -8px rgb(61 97 136 / 42%), inset 0 1px 0 rgb(255 255 255 / 35%); }
.button.primary:hover { background: var(--primary-hover); box-shadow: 0 8px 22px -8px rgb(61 97 136 / 35%); }
.button .icon { width: 17px; height: 17px; }
.hero-secondary, .text-link, .benefit-link { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 13px; color: var(--accent); }
.hero-secondary:hover, .text-link:hover, .benefit-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.text-link .icon { width: 16px; height: 16px; }

/* 主演示为一个完整容器，减少整页切割线和互相倾斜的卡片。 */
.connect-section { padding-bottom: 20px; }
.moments-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; padding: 46px; border-radius: 38px; background: rgb(255 255 255 / 90%); box-shadow: var(--shadow); }
.moments-copy h2 { margin-block: 12px 20px; font-size: clamp(28px, 3.2vw, 38px); font-weight: 600; line-height: 1.4; letter-spacing: -.7px; }
.moments-copy > p:not(.eyebrow):not(.demo-disclaimer) { font-size: 14px; color: var(--muted); line-height: 1.95; }
.moments-copy > p + p { margin-top: 12px; }
.reference-note { margin-top: 25px; padding: 22px; border-radius: 24px; background: var(--surface-soft); }
.reference-note-label { display: block; color: var(--accent); font-size: 11px; margin-bottom: 8px; }
.reference-note > p { font-size: 14px; line-height: 1.85; }
.reference-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 17px; }
.story-tab { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 42px; padding: 9px 12px; border: 0; border-radius: 24px; background: var(--surface); color: var(--accent); font-size: 12px; box-shadow: 0 2px 6px rgb(73 105 138 / 5%); transition: background .2s; }
.story-tab.active { background: var(--primary); color: var(--on-primary); box-shadow: inset 0 1px 0 rgb(255 255 255 / 30%); }
.story-tab:hover { background: var(--brand-ice); color: var(--on-primary); }
.story-tab .icon { width: 15px; height: 15px; }
.reference-note .reference-hint { color: var(--muted); font-size: 11px; margin-top: 13px; }
.demo-disclaimer { color: var(--muted); font-size: 11px; margin: 14px 0 0 4px; }
.story-stage { min-width: 0; }
.reference-preview { padding: 28px; border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow), 0 0 0 1px rgb(121 153 186 / 6%); }
.preview-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.preview-label { padding: 5px 11px; border-radius: 16px; background: var(--surface-soft); color: var(--accent); font-size: 11px; }
.preview-date { color: var(--muted); font-size: 11px; }
.reference-preview h3 { margin-block: 20px 10px; font-size: 23px; font-weight: 600; line-height: 1.5; }
.reference-preview > p { color: var(--muted); font-size: 13px; line-height: 1.9; }
.reference-stats { display: grid; grid-template-columns: 1fr 1.5fr; gap: 8px; margin: 21px 0 12px; padding: 16px; border-radius: 19px; background: var(--surface-soft); }
.reference-stats dt { color: var(--muted); font-size: 11px; }
.reference-stats dd { margin: 4px 0 0; color: var(--accent); font-size: 22px; font-weight: 500; line-height: 1.5; font-variant-numeric: tabular-nums; }
.reference-records { list-style: none; margin: 0; padding: 0; }
.reference-records li { display: grid; grid-template-columns: 45px minmax(0, 1fr); gap: 13px; padding-block: 15px; }
.reference-records time { align-self: start; margin-top: 2px; padding: 3px 4px; border-radius: 10px; background: var(--surface-soft); color: var(--muted); text-align: center; font-size: 11px; font-variant-numeric: tabular-nums; }
.reference-records strong { display: block; font-size: 13px; font-weight: 500; line-height: 1.8; }
.reference-records span { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.preview-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-top: 12px; color: var(--muted); font-size: 10px; }
.preview-chip { color: var(--accent); }

.section-heading { max-width: 750px; margin: 0 auto 32px; text-align: center; }
.section-heading h2 { margin-block: 10px 17px; font-size: clamp(28px, 3.6vw, 42px); font-weight: 600; line-height: 1.4; letter-spacing: -.9px; }
.section-heading > p:last-child { color: var(--muted); font-size: 14px; line-height: 1.95; }
.memory-heading h2 > span { display: block; }
.memory-heading .memory-promise { margin-top: 18px; font-size: 16px; line-height: 1.9; }
.memory-promise > span { display: inline-block; }
.feature[id] { scroll-margin-top: 10px; }
.feature-grid, .membership-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.feature, .member-benefit { min-width: 0; padding: 28px; border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-small), inset 0 1px 0 white; }
.feature-icon, .benefit-top .icon { width: 48px; height: 48px; padding: 12px; border-radius: 17px; color: var(--accent); background: linear-gradient(140deg, #F2F7FC, #DDEBF6); box-shadow: inset 0 1px 0 white, 0 4px 12px -7px rgb(73 105 138 / 20%); }
.feature h3, .member-benefit h3 { margin-block: 19px 12px; font-size: 18px; font-weight: 600; line-height: 1.6; }
.feature > p, .member-benefit > p { color: var(--muted); font-size: 13px; line-height: 1.95; }
.membership-section > .section-space { padding-top: 32px; }
.benefit-focus { background: linear-gradient(145deg, #E5EFF8, #F7FAFD); }
.benefit-focus h3 { color: var(--accent); }
.benefit-link { margin-top: 12px; }
.membership-detail { margin-top: 18px; }
.membership-detail summary { min-height: 44px; padding-block: 11px; color: var(--accent); font-size: 12px; }
.membership-detail > p { color: var(--muted); font-size: 12px; line-height: 1.9; padding-block: 4px; }
.membership-footer { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 26px 6px 0; }
.membership-footer p { margin-bottom: 6px; font-size: 14px; }
.membership-footer span { color: var(--muted); font-size: 11px; line-height: 1.8; }
.membership-footer span a { display: inline-block; color: var(--accent); }
.membership-footer span a:hover { text-decoration: underline; }
.membership-footer .button { flex-shrink: 0; }

/* 始终保留六张原始卡片的横向轨道；无脚本／减少动态效果时可手动浏览。 */
.member-carousel { min-width: 0; }
.carousel-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; }
.carousel-toolbar > p { color: var(--muted); font-size: 12px; }
.carousel-actions { display: flex; align-items: center; gap: 9px; margin-left: auto; }
.carousel-arrow { min-height: 44px; border: 0; background: var(--surface); color: var(--accent); box-shadow: var(--shadow-small); }
.carousel-arrow { display: grid; place-items: center; width: 44px; border-radius: 50%; }
.carousel-arrow .icon { width: 18px; height: 18px; }
.carousel-arrow[data-carousel-prev] .icon { transform: rotate(180deg); }
.carousel-arrow:hover:not(:disabled) { background: var(--surface-soft); }
.carousel-arrow:disabled { opacity: .4; cursor: default; }
.member-carousel .member-viewport { overflow-x: auto; padding: 12px 6px 26px; margin-inline: -6px; scroll-behavior: auto; scrollbar-width: thin; scrollbar-color: var(--brand-blue) transparent; border-radius: 26px; }
.member-carousel .membership-grid { display: flex; gap: 20px; align-items: stretch; }
.member-carousel .member-benefit { flex: 0 0 clamp(280px, 31vw, 340px); }
.member-viewport:focus-visible { outline-offset: 2px; }

.help-section { padding-top: 28px; padding-bottom: 32px; }
.help-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); align-items: start; gap: 58px; padding: 40px; border-radius: 34px; background: rgb(255 255 255 / 80%); box-shadow: var(--shadow-small); }
.support-section h2 { margin-block: 12px 16px; font-size: 30px; font-weight: 600; line-height: 1.45; letter-spacing: -.6px; }
.support-section > p:not(.eyebrow) { color: var(--muted); font-size: 13px; line-height: 1.9; }
.support-email { display: inline-block; margin-block: 19px 6px; color: var(--accent); font-size: clamp(15px, 1.8vw, 20px); overflow-wrap: anywhere; }
.support-email:hover { text-decoration: underline; text-underline-offset: 5px; }
.support-section .support-response { font-size: 11px; }
.support-section .text-link { margin-top: 13px; }
.faq-section h3 { margin-bottom: 16px; font-size: 17px; font-weight: 600; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { background: var(--surface-soft); border-radius: 20px; }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 16px 20px; list-style: none; font-size: 13px; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { display: grid; place-items: center; flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%; color: var(--accent); background: var(--surface); font-size: 18px; line-height: 1; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details > p { padding: 0 20px 20px; color: var(--muted); font-size: 12px; line-height: 1.95; }
.faq-list a { color: var(--accent); text-decoration: underline; }

/* 协议与支持正文沿用相同字体、圆角与层级，不改变法律原文。 */
.document-heading { padding-block: 52px 28px; }
.document-heading h1 { font-size: clamp(28px, 4vw, 42px); margin-block: 12px 16px; letter-spacing: -.7px; }
.document-heading > p { color: var(--muted); font-size: 13px; }
.document-nav, .language-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; font-size: 12px; }
.document-nav { margin-top: 21px; }
.document-nav a, .language-links a { display: inline-block; padding: 9px 13px; border-radius: 18px; color: var(--accent); }
.document-nav [aria-current], .language-links [aria-current] { background: var(--surface-soft); font-weight: 600; }
.language-links { margin-top: 20px; padding: 10px 14px; border-radius: 22px; background: var(--surface); box-shadow: var(--shadow-small); }
.language-links > span:first-child { color: var(--muted); }
.document-heading .source-note { margin-top: 12px; font-size: 12px; }
.source-note a { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }
.document-layout { display: grid; grid-template-columns: 205px minmax(0, 1fr); align-items: start; gap: 26px; padding-bottom: 50px; }
.document-toc { position: sticky; top: 120px; max-height: calc(100vh - 144px); overflow: auto; padding: 22px; border-radius: 24px; background: var(--surface); box-shadow: var(--shadow-small); font-size: 12px; }
.document-toc strong { display: block; margin-bottom: 10px; font-weight: 600; }
.document-toc a { display: block; padding-block: 8px; color: var(--muted); }
.document-toc a:hover { color: var(--accent); }
.document-body { min-width: 0; padding: clamp(24px, 4vw, 46px); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-small); font-size: 15px; line-height: 2; overflow-wrap: anywhere; }
.document-body h2 { font-size: 23px; line-height: 1.6; margin-block: 34px 17px; font-weight: 600; }
.document-body h2:first-child { margin-top: 0; }
.document-body h3 { font-size: 18px; line-height: 1.7; margin-block: 26px 12px; font-weight: 600; }
.document-body p { margin-bottom: 18px; }
.document-body ul, .document-body ol { padding-left: 1.5em; margin-block: 16px 23px; }
.document-body li { padding-left: 4px; margin-bottom: 12px; }
.document-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.document-body strong { font-weight: 600; }
.table-scroll { overflow-x: auto; margin-block: 25px; border-radius: 16px; }
.document-body table { border-collapse: collapse; width: 100%; min-width: 500px; font-size: 13px; }
.document-body th, .document-body td { padding: 13px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.document-body th { background: var(--surface-soft); font-weight: 600; }

.site-footer { padding-block: 30px 26px; }
.footer-top { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; }
.footer-top > p { font-size: 11px; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; margin-left: auto; color: var(--muted); font-size: 12px; }
.footer-links a { padding-block: 10px; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 20px; margin-top: 22px; padding-top: 19px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.site-registration { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 10px 20px; }
.site-registration a:hover, .footer-bottom > a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 960px) {
  .desktop-nav { gap: 17px; font-size: 12px; }
  .moments-inner { gap: 28px; padding: 32px; }
  .reference-preview { padding: 23px; }
  .feature-grid, .membership-grid { gap: 16px; }
  .feature, .member-benefit { padding: 23px; }
  .help-grid { padding: 32px; gap: 30px; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .site-header { width: calc(100% - 32px); top: 10px; min-height: 68px; margin-top: 12px; padding: 10px 16px; border-radius: 23px; }
  .desktop-nav { display: none; }
  .hero { padding-block: 46px 55px; }
  .hero-logo { width: 104px; }
  .hero-description { max-width: 580px; font-size: 14px; }
  .hero-pillars { gap: 6px; padding: 8px; }
  .hero-pillar { padding: 14px 12px; }
  .pillar-heading { gap: 7px; }
  .pillar-heading strong { font-size: 14px; }
  .section-space { padding-block: 46px; }
  .moments-inner { grid-template-columns: 1fr; padding: 28px; border-radius: 30px; }
  .moments-copy h2 br { display: none; }
  .story-stage { width: 100%; max-width: 500px; justify-self: center; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature { padding: 27px; }
  .feature-icon { float: left; margin-right: 14px; }
  .feature h3 { margin-block: 11px 22px; }
  .feature > p { clear: both; }
  .membership-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .membership-footer { flex-direction: column; align-items: flex-start; gap: 18px; }
  .help-section { padding-top: 0; padding-bottom: 24px; }
  .help-grid { grid-template-columns: 1fr; padding: 28px; }
  .support-section h2 br { display: none; }
  .document-layout { grid-template-columns: 1fr; gap: 20px; }
  .document-toc { position: static; max-height: none; }
  .document-toc nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
  .footer-links { margin-left: 0; }
}
@media (max-width: 480px) {
  .aurora-blob { width: 92vmax; filter: blur(36px); }
  .aurora-mist, .aurora-sky { display: none; }
  html { scroll-padding-top: 100px; }
  .shell { width: calc(100% - 32px); }
  .site-header { gap: 12px; }
  .brand > span { font-size: 18px; }
  .header-contact { padding-inline: 13px; font-size: 11px; }
  .hero { padding-block: 38px 44px; }
  .hero-logo { width: 90px; }
  .hero-art { margin-bottom: 22px; }
  h1 { font-size: clamp(30px, 7.5vw, 36px); letter-spacing: -1px; margin-block: 15px 19px; }
  .hero .eyebrow { font-size: 12px; letter-spacing: .3px; }
  .hero-description { font-size: 13px; line-height: 1.95; padding-inline: 4px; }
  .hero-message { padding-top: 0; }
  .hero-pillars { grid-template-columns: 1fr; gap: 3px; padding: 10px; margin-top: 28px; border-radius: 24px; }
  .hero-pillar { display: grid; grid-template-columns: 112px minmax(0, 1fr); align-items: center; gap: 8px; padding: 12px; border-radius: 16px; }
  .pillar-summary { margin-top: 0; font-size: 12px; }
  .hero-actions { gap: 12px 18px; margin-top: 24px; }
  .button { font-size: 13px; padding-inline: 21px; }
  .hero-secondary { font-size: 12px; }
  .moments-inner { padding: 24px 20px; border-radius: 28px; gap: 25px; }
  .moments-copy h2 { font-size: 28px; }
  .moments-copy h2 br { display: block; }
  .reference-note { padding: 18px; border-radius: 21px; }
  .reference-tabs { gap: 6px; }
  .story-tab { font-size: 11px; padding-inline: 10px; }
  .reference-preview { padding: 20px; border-radius: 24px; }
  .reference-preview h3 { font-size: 21px; }
  .reference-stats { padding: 13px; gap: 6px; }
  .reference-stats dd { font-size: 18px; }
  .preview-date { font-size: 10px; }
  .reference-records li { grid-template-columns: 39px minmax(0, 1fr); gap: 10px; }
  .section-heading h2 { font-size: 29px; }
  .section-heading > p:last-child { font-size: 13px; text-align: left; padding-inline: 5px; }
  .memory-heading .memory-promise { font-size: 14px; text-align: center; padding-inline: 0; }
  .memory-promise > span { display: block; }
  .membership-section .section-heading > p:last-child { text-align: center; }
  .membership-grid { grid-template-columns: 1fr; gap: 14px; }
  .member-carousel .membership-grid { gap: 16px; }
  .member-carousel .member-benefit { flex-basis: 88%; }
  .member-benefit { padding: 25px; }
  .help-grid { padding: 25px 21px; border-radius: 28px; }
  .support-section h2 { font-size: 27px; }
  .support-email { font-size: 16px; }
  .faq-list summary { padding: 15px 17px; }
  .footer-top { gap: 12px 16px; }
  .footer-top > p { margin-left: auto; font-size: 10px; }
  .footer-links { width: 100%; justify-content: center; font-size: 11px; }
  .footer-bottom { justify-content: center; font-size: 10px; }
  .site-registration { order: 3; width: 100%; }
  .document-heading { padding-block: 34px 23px; }
  .document-body { padding: 24px 21px; font-size: 14px; }
  .document-body h2 { font-size: 21px; }
}
/* 首页只有一个纵向滚动区，导航使用真实 Grid 行高，永远不叠在正文上。
   100% 指向导航下方的可用高度；min-height 让长内容自然增高。
   CSS Scroll Snap 对超高区域允许内部连续阅读，只在跨屏时吸附。 */
html.home-page { height: 100%; overflow: hidden; scroll-padding: 0; }
.home-page body {
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}
.home-page .site-header {
  position: relative;
  top: auto;
  grid-row: 1;
  margin-top: max(12px, env(safe-area-inset-top));
  margin-bottom: 12px;
}
.home-page .page-scroll {
  grid-row: 2;
  min-height: 0;
  min-width: 0;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  scroll-padding: 0;
  overscroll-behavior-y: contain;
  scrollbar-gutter: stable both-edges;
}
.home-page .page-scroll:focus-visible { outline-offset: -4px; }
.home-page .page-screen {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: clamp(24px, 4vh, 48px);
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  scroll-snap-align: start;
  scroll-snap-stop: always;
}
.home-page .page-screen > * { flex-shrink: 0; }
.home-page .membership-section > .section-space { padding-block: 0; }
.home-page .closing-screen .help-section { padding-block: 0; }
.home-page .closing-screen .site-footer { padding-bottom: 0; }
/* 首屏压缩的是装饰与留白，不裁切文字；常见笔记本高度可完整读到特色入口。 */
.home-page .hero-logo { width: clamp(68px, 10vh, 104px); }
.home-page .hero-art { margin-bottom: 12px; }
.home-page .hero h1 { margin-block: 10px 14px; font-size: clamp(30px, 4.2vw, 52px); line-height: 1.24; }
.home-page .hero-description { margin-top: 8px; }
.home-page .hero-actions { margin-top: 20px; }
.home-page .hero-pillars { margin-top: 24px; padding: 8px; }
.home-page .hero-pillar { padding-block: 12px; }
@media (min-width: 761px) and (max-height: 800px) {
  .home-page .page-screen { padding-block: 20px; padding-bottom: max(20px, env(safe-area-inset-bottom)); }
  .home-page .hero { flex-direction: row-reverse; gap: clamp(24px, 4vw, 56px); text-align: left; }
  .home-page .hero-art { flex: 0 1 20%; margin: 0; }
  .home-page .hero-logo { width: 100%; max-width: 200px; }
  .home-page .hero-copy { flex: 1; max-width: 750px; }
  .home-page .hero-message { margin-inline: 0; }
  .home-page .hero-actions { justify-content: flex-start; }
  .home-page .hero-pillar { padding-inline: 10px; }
  .home-page .moments-inner { padding-block: 28px; }
  .home-page .reference-note { margin-top: 18px; padding: 18px; }
  .home-page .reference-preview { padding-block: 20px; }
  .home-page .reference-preview h3 { margin-block: 14px 8px; font-size: 21px; }
  .home-page .reference-stats { margin-block: 14px 8px; padding: 12px; }
  .home-page .reference-stats dd { font-size: 19px; }
  .home-page .reference-records li { padding-block: 8px; }
  .home-page .preview-bottom { margin-top: 8px; }
  .home-page .membership-section .section-heading { margin-bottom: 14px; }
  .home-page .membership-section .section-heading h2 { margin-block: 6px 8px; font-size: 34px; line-height: 1.25; }
  .home-page .member-benefit { padding: 20px; }
  .home-page .benefit-top .icon { width: 32px; height: 32px; padding: 7px; border-radius: 12px; }
  .home-page .member-benefit h3 { margin-block: 10px 8px; font-size: 16px; }
  .home-page .member-benefit > p { line-height: 1.8; }
  .home-page .membership-detail { margin-top: 10px; }
  .home-page .member-carousel .member-viewport { padding-block: 8px 12px; }
  .home-page .membership-footer { padding-top: 14px; }
}
@media (max-width: 760px) {
  .home-page .page-screen { padding-top: 24px; }
  .home-page .hero h1 { font-size: clamp(30px, 6vw, 42px); }
  .home-page .hero-logo { width: 68px; }
}
@media (prefers-reduced-motion: reduce) {
  .aurora-blob { animation: none; will-change: auto; }
  html { scroll-behavior: auto; }
  .home-page .page-scroll { scroll-snap-type: none; scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}
@media print {
  .carousel-toolbar { display: none; }
  .member-carousel .member-viewport { overflow: visible; }
  .member-carousel .membership-grid { display: grid; grid-template-columns: 1fr; }
  html.home-page, .home-page body { height: auto; overflow: visible; display: block; }
  .home-page .page-scroll { overflow: visible; scroll-snap-type: none; }
  .home-page .page-screen { min-height: 0; display: block; padding-block: 24px; }
  .home-page .hero-art { display: none; }
  .aurora, .header-contact, .desktop-nav { display: none; }
  body { background: white; }
  .site-header, .document-toc { position: static; }
  .site-header, .document-body, .document-toc, .feature, .member-benefit { box-shadow: none; }
}