/* OD-LAYOUT-PRIMITIVES v1 — structure only: display, flex/grid, overflow, wrapping, ratio, geometry.
   Put this @layer first; product CSS outside the layer wins ordinary layout rules.
   Native hidden and closed-dialog states take precedence over component display rules. */
@layer od-layout {
  [hidden]:not([hidden="until-found" i]) { display: none !important; }
  dialog:not([open]) { display: none !important; }
  :where(.od-stack,.od-row,.od-row-top,.od-cluster,.od-grid,.od-field,.od-stat,.od-cell,.od-tile) > :where(*) { min-width: 0; }
  .od-stack { display: flex; flex-direction: column; gap: var(--od-gap, 8px); }
  .od-row { display: flex; align-items: center; gap: var(--od-gap, 8px); }
  .od-row-top { display: flex; align-items: flex-start; gap: var(--od-gap, 8px); }
  .od-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--od-gap, 8px); }
  .od-fill { flex: 1 1 0; min-width: 0; }
  .od-fixed { flex: none; }
  .od-grid { display: grid; gap: var(--od-gap, 12px); grid-template-columns: repeat(var(--od-cols, 3), minmax(0, 1fr)); }
  .od-stat, .od-field, .od-cell { display: grid; gap: var(--od-gap, 2px); }
  :where(.od-stat,.od-field,.od-cell) > :where(*) { display: block; }
  .od-tile { display: grid; grid-template-rows: auto 1fr; }
  :where(.od-tile) > :where(*) { display: block; }
  .od-media { display: block; width: 100%; height: auto; aspect-ratio: var(--od-ratio, auto); }
  .od-media-cover { object-fit: cover; }
  .od-icon { display: inline-block; inline-size: var(--od-icon-size, 1em); block-size: var(--od-icon-size, 1em); flex: none; }
  .od-truncate { display: block; max-width: 100%; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
  .od-clamp-2, .od-clamp-3 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; overflow-wrap: anywhere; }
  .od-clamp-2 { -webkit-line-clamp: 2; }
  .od-clamp-3 { -webkit-line-clamp: 3; }
  .od-lines-2 { min-height: calc(2 * 1.4em); }
  .od-nowrap { white-space: nowrap; }
  .od-keep { word-break: keep-all; overflow-wrap: anywhere; }
  .od-screen { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; height: 100%; }
  .od-scroll { overflow-y: auto; overscroll-behavior: contain; min-height: 0; }
  .od-rail { display: flex; gap: var(--od-gap, 8px); overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: none; padding-inline: var(--od-rail-pad, 16px); scroll-padding-inline: var(--od-rail-pad, 16px); }
  .od-rail::-webkit-scrollbar { display: none; }
  :where(.od-rail) > :where(*) { flex: none; scroll-snap-align: start; }
  :where(.od-rail) > :where(:last-child) { margin-inline-end: var(--od-rail-pad, 16px); }
  .od-spacer { flex: none; visibility: hidden; pointer-events: none; }
  .od-touch { min-width: 44px; min-height: 44px; }
}
:root [hidden]:where(:not([hidden="until-found" i])) { display: none; }
/* /OD-LAYOUT-PRIMITIVES v1 */

:root {
  --bg: #f7f8f6;
  --surface: #ffffff;
  --surface-soft: #eef2ef;
  --ink: #202924;
  --muted: #5b6861;
  --subtle: #758078;
  --line: #dce3de;
  --brand: #b8433b;
  --brand-hover: #92342e;
  --brand-soft: #fae9e6;
  --sage: #46685a;
  --sage-dark: #243e34;
  --focus: #176b87;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-display: "Songti SC", "STSong", "Noto Serif CJK SC", "SimSun", serif;
  --container: 1184px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-dialog: 0 24px 64px rgb(25 38 31 / 20%);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font-body); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
body:has(dialog[open]) { overflow: hidden; }
a { color: inherit; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
img, svg { max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2 { font-family: var(--font-display); font-weight: 700; letter-spacing: -.03em; }
h1 { font-size: clamp(40px, 5vw, 64px); line-height: 1.2; }
h2 { font-size: clamp(30px, 3.2vw, 44px); line-height: 1.3; }
h3 { font-size: 20px; line-height: 1.45; }
p { color: var(--muted); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
::selection { background: var(--brand-soft); color: var(--ink); }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.section { padding-block: 96px; }
.section-tinted { background: radial-gradient(640px 420px at 90% -8%, rgb(184 67 59 / 6%), transparent 68%), radial-gradient(760px 520px at 4% 108%, rgb(70 104 90 / 7%), transparent 70%), linear-gradient(180deg, #eef2ef, #e9f0ea 55%, #edf1ec); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 1000; transform: translateY(-160%); background: var(--ink); color: #fff; padding: 8px 16px; border-radius: var(--radius-sm); text-decoration: none; }
.skip-link:focus { transform: translateY(0); }
.eyebrow { margin-bottom: 16px; color: var(--brand); font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.eyebrow-light { color: #f3c9c2; }
.section-heading { max-width: 720px; margin-bottom: 48px; }
.section-heading h2 { margin-bottom: 16px; }
.section-heading > p:last-child { font-size: 18px; }
.section-heading-split { max-width: none; display: flex; align-items: end; justify-content: space-between; gap: 32px; }
.section-heading-split h2 { margin-bottom: 0; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgb(247 248 246 / 96%); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 80px; display: flex; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; flex: none; }
.brand-mark { display: block; flex: none; }
.brand-copy { display: grid; gap: 0; }
.brand-copy strong { font-size: 18px; letter-spacing: .04em; line-height: 1.4; }
.brand-copy small { color: var(--muted); font-size: 12px; line-height: 1.5; }
.primary-nav { display: flex; align-items: center; justify-content: center; gap: 8px; margin-inline: auto; }
.primary-nav a { position: relative; padding: 12px 16px; border-radius: var(--radius-sm); color: var(--muted); font-weight: 600; text-decoration: none; }
.primary-nav a:hover { color: var(--ink); background: var(--surface-soft); }
.primary-nav a[aria-current="page"] { color: var(--brand); }
.primary-nav a[aria-current="page"]::after { content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px; background: var(--brand); }
.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 20px; border: 1px solid transparent; border-radius: 10px; font-weight: 700; line-height: 1.4; text-align: center; text-decoration: none; transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out, transform 180ms ease-out; }
.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button-primary { background: var(--brand); color: #fff; }
.button-primary:hover { background: var(--brand-hover); color: #fff; }
.button-secondary { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button-secondary:hover { border-color: var(--sage); background: var(--surface-soft); color: var(--ink); }
.button-light { background: #fff; color: var(--sage-dark); }
.button-light:hover { background: var(--brand-soft); color: var(--sage-dark); }
.button-large { min-height: 52px; padding: 14px 24px; }
.button-group { display: flex; flex-wrap: wrap; gap: 12px; }
.icon-24 { --od-icon-size: 24px; }
.menu-toggle, .nav-mobile-action { display: none; }
.icon-button { display: inline-flex; align-items: center; justify-content: center; padding: 8px; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--ink); }
.icon-button:hover { background: var(--surface-soft); color: var(--ink); }

.hero { padding-block: 80px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); align-items: center; gap: 80px; }
.hero-copy h1 { margin-bottom: 24px; }
.hero-lead { max-width: 620px; margin-bottom: 32px; font-size: 18px; line-height: 1.85; }
.hero-note { display: flex; align-items: center; gap: 8px; margin-top: 20px; font-size: 14px; }
.hero-note .od-icon { --od-icon-size: 20px; color: var(--sage); }
.hero-visual { display: grid; justify-items: center; gap: 16px; }
.hero-visual figcaption { color: var(--muted); font-size: 13px; text-align: center; }
.miniapp-frame { width: min(100%, 320px); padding: 12px; border: 1px solid #cfd8d2; border-radius: 28px; background: var(--surface); box-shadow: 0 20px 48px rgb(35 62 52 / 10%); }
.miniapp-bar { min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-inline: 12px; color: var(--ink); font-size: 14px; font-weight: 700; }
.miniapp-more { letter-spacing: .1em; }
.screenshot-placeholder { min-height: 440px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 32px; border: 1px dashed #aebbb3; border-radius: 16px; background: var(--surface-soft); color: var(--sage); text-align: center; }
.screenshot-placeholder strong { margin-top: 8px; color: var(--ink); font-size: 17px; }
.screenshot-placeholder span { color: var(--muted); font-size: 14px; }
.placeholder-icon { opacity: .65; }
.miniapp-caption { display: flex; justify-content: space-around; gap: 8px; padding: 16px 4px 4px; color: var(--muted); font-size: 12px; }
.miniapp-frame-small { width: min(100%, 280px); box-shadow: none; }
.miniapp-frame-small .screenshot-placeholder { min-height: 390px; }
/* 真实小程序截图：保留原卡片比例，图片自适应裁切，宽度/高度属性仅用于预留布局防 CLS */
.screenshot-real { min-height: 0; padding: 0; overflow: hidden; border: 0; background: var(--surface-soft); aspect-ratio: var(--screenshot-ratio, 9 / 19); }
/* 两组截图保持各自原始宽高比，避免 cover 为适配统一容器而裁掉底部导航 */
.screenshot-homepage { --screenshot-ratio: 720 / 1612; }
.screenshot-album { --screenshot-ratio: 1080 / 2340; }
.screenshot-space { --screenshot-ratio: 430 / 940; }
.screenshot-schoolmate { --screenshot-ratio: 423 / 920; }
.screenshot-invite { --screenshot-ratio: 1080 / 2340; transition: aspect-ratio .45s ease; }
.screenshot-real > img,
.screenshot-carousel-slide > img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top center; }
.screenshot-carousel { position: relative; display: block; margin-bottom: 46px; overflow: visible; touch-action: pan-y; user-select: none; }
.screenshot-carousel-viewport { width: 100%; height: 100%; overflow: hidden; border-radius: 16px; }
.screenshot-carousel-track { display: flex; width: 100%; height: 100%; transition: transform .55s cubic-bezier(.22, .61, .36, 1); will-change: transform; }
.screenshot-carousel-slide { flex: 0 0 100%; width: 100%; height: 100%; overflow: hidden; }
.screenshot-carousel-controls { position: absolute; z-index: 2; left: 50%; bottom: -42px; display: flex; align-items: center; gap: 3px; padding: 4px 6px; border-radius: 999px; background: rgb(32 41 36 / 88%); box-shadow: 0 4px 14px rgb(32 41 36 / 18%); transform: translateX(-50%); }
.screenshot-carousel-controls button { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 30px; height: 30px; padding: 0; border: 0; border-radius: 50%; background: transparent; color: #fff; cursor: pointer; }
.screenshot-carousel-controls button:hover { background: rgb(255 255 255 / 18%); }
.screenshot-carousel-controls button:disabled { opacity: .45; cursor: default; }
.screenshot-carousel-controls button:focus-visible { outline: 2px solid #fff; outline-offset: 1px; }
.screenshot-carousel-controls svg { width: 17px; height: 17px; }
.screenshot-carousel-dots { display: flex; align-items: center; gap: 1px; }
.screenshot-carousel-dots button { position: relative; width: 22px; }
.screenshot-carousel-dots button::after { content: ""; width: 6px; height: 6px; border-radius: 999px; background: rgb(255 255 255 / 48%); transition: width .2s ease, background-color .2s ease; }
.screenshot-carousel-dots button[aria-current="true"]::after { width: 16px; background: #fff; }
.screenshot-carousel:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { .screenshot-carousel-track, .screenshot-carousel-dots button::after, .screenshot-invite { transition: none; } }

.value-strip { border-block: 1px solid var(--line); background: var(--surface); }
.value-list { display: grid; grid-template-columns: repeat(3, 1fr); }
.value-item { display: flex; align-items: center; justify-content: center; gap: 16px; padding: 28px 24px; }
.value-item + .value-item { border-left: 1px solid var(--line); }
.value-item > .od-icon { --od-icon-size: 28px; color: var(--brand); }
.value-item > span { display: grid; gap: 2px; }
.value-item strong { font-size: 17px; }
.value-item small { color: var(--muted); font-size: 14px; }

.space-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.space-card { min-height: 280px; display: flex; flex-direction: column; align-items: flex-start; padding: 32px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.space-card-featured { background: var(--sage-dark); border-color: var(--sage-dark); }
.space-card-featured h3, .space-card-featured .card-number { color: #fff; }
.space-card-featured p, .space-card-featured .text-link { color: #d8e3dd; }
.card-number { margin-bottom: 32px; color: var(--brand); font-size: 14px; font-weight: 800; letter-spacing: .12em; }
.space-card h3 { margin-bottom: 12px; font-size: 24px; }
.space-card p { margin-bottom: 24px; }
.text-link { margin-top: auto; color: var(--sage); font-size: 14px; font-weight: 700; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px 40px; }
.feature-item { padding-top: 24px; border-top: 1px solid #cbd5ce; }
.feature-icon { --od-icon-size: 32px; margin-bottom: 20px; color: var(--brand); }
.feature-item h3 { margin-bottom: 8px; }
.arrow-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; color: var(--brand); font-weight: 700; text-decoration: none; white-space: nowrap; }
.arrow-link:hover { color: var(--brand-hover); text-decoration: underline; text-underline-offset: 4px; }
.arrow-link .od-icon { --od-icon-size: 20px; }

.story-grid { display: grid; grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr); align-items: center; gap: 96px; }
.story-visual { display: flex; justify-content: center; padding: 40px; border-radius: var(--radius-lg); background: var(--brand-soft); }
.story-copy h2 { max-width: 560px; margin-bottom: 20px; }
.story-copy > p:not(.eyebrow) { max-width: 580px; font-size: 18px; }
.check-list { display: grid; gap: 12px; margin: 28px 0 24px; padding: 0; list-style: none; }
.check-list li { display: flex; align-items: center; gap: 12px; }
.check-list .od-icon { --od-icon-size: 22px; color: var(--sage); }
.steps-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin: 0; padding: 0; list-style: none; counter-reset: steps; }
.steps-list li { display: flex; align-items: flex-start; gap: 20px; }
.step-number { width: 48px; height: 48px; display: grid; place-items: center; flex: none; border-radius: 50%; background: var(--sage-dark); color: #fff; font-family: var(--font-display); font-size: 24px; }
.steps-list h3 { margin: 4px 0 8px; }
.cta-section { padding-top: 80px; }
.cta-panel { display: flex; align-items: center; justify-content: space-between; gap: 48px; padding: 56px 64px; border-radius: var(--radius-lg); background: var(--sage-dark); }
.cta-panel h2 { margin-bottom: 16px; color: #fff; }
.cta-panel p:not(.eyebrow) { color: #d8e3dd; }
.cta-panel .button { flex: none; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-main { display: grid; grid-template-columns: 1.4fr .7fr 1fr; gap: 64px; padding-block: 56px; }
.footer-brand > p { max-width: 360px; margin-top: 20px; }
.footer-links { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; color: var(--muted); font-size: 14px; }
.footer-links strong { margin-bottom: 4px; color: var(--ink); font-size: 16px; }
.footer-links a, .footer-links button { min-height: 32px; padding: 0; border: 0; background: none; color: var(--muted); text-decoration: none; }
.footer-links a:hover, .footer-links button:hover { color: var(--brand); text-decoration: underline; text-underline-offset: 4px; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding-block: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-bottom a { color: inherit; text-decoration: none; }
.footer-bottom a:hover { color: var(--brand); text-decoration: underline; text-underline-offset: 4px; }

.qr-dialog { width: min(calc(100% - 32px), 480px); max-height: calc(100dvh - 48px); margin: auto; padding: 32px; overflow-y: auto; border: 0; border-radius: var(--radius-lg); background: var(--surface); color: var(--ink); box-shadow: var(--shadow-dialog); text-align: center; }
.qr-dialog::backdrop { background: rgb(20 30 25 / 64%); }
.dialog-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; text-align: left; }
.dialog-header .eyebrow { margin-bottom: 4px; }
.dialog-header h2 { font-family: var(--font-body); font-size: 24px; letter-spacing: 0; }
.qr-dialog > p { margin-top: 16px; }
.qr-image { display: block; width: 240px; height: auto; margin: 24px auto 0; border: 1px solid var(--line); border-radius: var(--radius-sm); }
.qr-dialog .qr-placeholder-note { padding: 12px; border-radius: var(--radius-sm); background: var(--brand-soft); color: #78362f; font-size: 13px; }
.qr-dialog .mobile-tip { font-size: 14px; }
.dialog-confirm { width: 100%; margin-top: 24px; }

/* 产品详情 */
.page-hero { padding-block: 72px; border-bottom: 1px solid var(--line); background: radial-gradient(720px 480px at 14% -12%, rgb(184 67 59 / 7%), transparent 66%), radial-gradient(680px 520px at 92% 6%, rgb(70 104 90 / 8%), transparent 68%), linear-gradient(180deg, #fbfcfa, #f4f6f2); }
.page-hero-grid { display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 64px; }
.page-hero h1 { max-width: 760px; margin-bottom: 20px; font-size: clamp(38px, 4.5vw, 56px); }
.page-hero p:not(.eyebrow) { max-width: 680px; font-size: 18px; }
.page-hero-aside { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--bg); }
.page-hero-aside strong { display: block; margin-bottom: 8px; font-size: 17px; }
.page-hero-aside p { font-size: 14px !important; }
.product-nav { position: sticky; top: 80px; z-index: 40; border-bottom: 1px solid var(--line); background: rgb(247 248 246 / 97%); }
.product-nav .container { display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none; }
.product-nav .container::-webkit-scrollbar { display: none; }
.product-nav a { min-height: 52px; display: inline-flex; align-items: center; flex: none; padding: 8px 14px; color: var(--muted); font-size: 14px; font-weight: 700; text-decoration: none; }
.product-nav a:hover { color: var(--brand); }
.product-section { padding-block: 80px; border-bottom: 1px solid var(--line); }
.product-section:nth-of-type(even) { background: var(--surface); }
.product-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 360px); align-items: center; gap: 80px; }
.product-grid-reverse { grid-template-columns: minmax(260px, 360px) minmax(0, 1fr); }
.product-copy h2 { margin-bottom: 20px; font-size: clamp(30px, 3vw, 40px); }
.product-copy > p:not(.eyebrow) { margin-bottom: 24px; font-size: 17px; }
.detail-list { display: grid; gap: 16px; margin: 0; padding: 0; list-style: none; }
.detail-list li { display: grid; grid-template-columns: 24px 1fr; gap: 12px; }
.detail-list .od-icon { --od-icon-size: 22px; margin-top: 4px; color: var(--brand); }
.detail-list strong { display: block; margin-bottom: 2px; }
.detail-list p { font-size: 15px; }
.product-visual { display: flex; justify-content: center; }
.product-visual .miniapp-frame { width: min(100%, 280px); box-shadow: none; }
.product-visual .screenshot-placeholder { min-height: 390px; }
.info-panel { margin-top: 24px; padding: 20px 24px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface-soft); }
.info-panel strong { display: block; margin-bottom: 4px; }
.info-panel p { font-size: 14px; }
.role-table { width: 100%; margin-top: 24px; border-collapse: collapse; font-size: 15px; }
.role-table th, .role-table td { padding: 12px 16px; border-bottom: 1px solid var(--line); text-align: left; }
.role-table th { color: var(--muted); font-size: 13px; }
.role-table td { color: var(--muted); }
.role-table td:first-child { color: var(--ink); font-weight: 700; }
.product-end { padding-block: 80px; }
.product-end .cta-panel { padding: 48px; }

/* 常见问题 */
.faq-hero { padding-bottom: 48px; }
.faq-shell { display: grid; grid-template-columns: 280px minmax(0, 1fr); align-items: start; gap: 48px; padding-block: 64px 96px; }
.faq-sidebar { position: sticky; top: 112px; }
.search-label { display: block; margin-bottom: 8px; font-weight: 700; }
.search-box { position: relative; }
.search-box .od-icon { --od-icon-size: 20px; position: absolute; top: 14px; left: 14px; color: var(--muted); pointer-events: none; }
.search-input { width: 100%; min-height: 48px; padding: 10px 12px 10px 44px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); }
.search-input::placeholder { color: #6a756f; }
.search-input:focus { border-color: var(--focus); }
.faq-categories { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.faq-filter { min-height: 44px; padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: 14px; }
.faq-filter:hover { border-color: var(--sage); color: var(--ink); }
.faq-filter[aria-pressed="true"] { border-color: var(--sage-dark); background: var(--sage-dark); color: #fff; }
.faq-help { margin-top: 32px; padding: 24px; border-radius: var(--radius-md); background: var(--brand-soft); }
.faq-help h2 { margin-bottom: 8px; font-family: var(--font-body); font-size: 20px; letter-spacing: 0; }
.faq-help p { margin-bottom: 16px; font-size: 14px; }
.faq-results-meta { margin-bottom: 16px; font-size: 14px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.faq-item[open] { border-color: #b9c8be; }
.faq-item summary { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px 20px; color: var(--ink); font-weight: 700; cursor: pointer; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex: none; color: var(--brand); font-size: 24px; font-weight: 400; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: var(--brand); }
.faq-answer { padding: 0 20px 20px; }
.faq-answer p { max-width: 72ch; }
.faq-answer a { color: var(--brand); }
.faq-empty { padding: 48px 24px; border: 1px dashed #aebbb3; border-radius: var(--radius-md); background: var(--surface); text-align: center; }
.faq-empty h2 { margin-bottom: 8px; font-family: var(--font-body); font-size: 22px; letter-spacing: 0; }
.faq-empty p { margin-bottom: 20px; }
.faq-bottom { padding-top: 0; }

/* 场景方案 */
.scenario-section { padding-block: 96px; border-bottom: 1px solid var(--line); }
.scenario-section-alt { background: var(--surface); }
.scenario-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr); align-items: center; gap: 80px; }
.scenario-grid-reverse { grid-template-columns: minmax(320px, .9fr) minmax(0, 1.1fr); }
.scenario-copy h2 { margin-bottom: 20px; }
.scenario-copy > p:not(.eyebrow) { font-size: 18px; }
.scenario-block { margin-top: 28px; }
.scenario-block h3 { margin-bottom: 12px; font-size: 17px; }
.pain-list { margin: 0; padding-left: 20px; color: var(--muted); }
.pain-list li + li { margin-top: 8px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list span { display: block; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--sage); font-size: 14px; font-weight: 700; }
.scenario-flow { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.scenario-flow li { display: flex; align-items: center; gap: 12px; color: var(--muted); }
.scenario-flow span { width: 28px; height: 28px; display: grid; place-items: center; flex: none; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font-size: 13px; font-weight: 800; }
.scenario-copy .button-group { align-items: center; margin-top: 32px; }
.scenario-panel { padding: 40px; border-radius: var(--radius-lg); background: var(--sage-dark); }
.scenario-label { display: block; margin-bottom: 16px; color: #f3c9c2; font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.scenario-panel h3 { margin-bottom: 8px; color: #fff; font-family: var(--font-display); font-size: 28px; }
.scenario-panel > p { color: #d8e3dd; }
.scenario-map { display: grid; margin-block: 32px 24px; }
.scenario-map > div { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 16px; padding-block: 16px; border-top: 1px solid rgb(255 255 255 / 18%); }
.scenario-map span, .scenario-map strong { display: block; }
.scenario-map span { color: #b9ccc1; font-size: 13px; }
.scenario-map strong { color: #fff; font-size: 15px; font-weight: 600; }
.scenario-panel small { display: block; color: #b9ccc1; font-size: 12px; }
.scenario-guide-link { margin-top: 40px; }

/* 使用指南 */
.guide-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); align-items: start; gap: 48px; padding-block: 64px 96px; }
.guide-sidebar { position: sticky; top: 112px; }
.guide-sidebar > strong { display: block; margin-bottom: 12px; font-size: 18px; }
.guide-sidebar nav { display: grid; gap: 4px; margin-bottom: 24px; }
.guide-sidebar nav a { min-height: 44px; display: flex; align-items: center; padding: 8px 12px; border-radius: var(--radius-sm); color: var(--muted); font-size: 14px; text-decoration: none; }
.guide-sidebar nav a:hover { background: var(--surface-soft); color: var(--brand); }
.guide-sidebar .button { width: 100%; }
.guide-content { display: grid; gap: 32px; }
.guide-task { scroll-margin-top: 104px; padding: 32px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.guide-task-header { display: flex; align-items: center; gap: 20px; }
.guide-number { width: 48px; height: 48px; display: grid; place-items: center; flex: none; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font-family: var(--font-display); font-size: 20px; font-weight: 700; }
.guide-task-header .eyebrow { margin-bottom: 4px; }
.guide-task-header h2 { font-family: var(--font-body); font-size: 30px; letter-spacing: 0; }
.guide-meta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-block: 24px; }
.guide-meta > div { padding: 16px; border-radius: 10px; background: var(--surface-soft); }
.guide-meta strong, .guide-meta span { display: block; }
.guide-meta strong { margin-bottom: 4px; font-size: 13px; }
.guide-meta span { color: var(--muted); font-size: 14px; }
.guide-task-body { display: grid; grid-template-columns: minmax(0, 1fr) 280px; align-items: start; gap: 32px; }
.guide-steps { display: grid; gap: 24px; margin: 0; padding: 0; list-style: none; }
.guide-steps li { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 12px; }
.guide-steps li > span { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid #c8d3cc; border-radius: 50%; color: var(--sage); font-size: 13px; font-weight: 800; }
.guide-steps h3 { margin: 2px 0 4px; font-size: 17px; }
.guide-steps p { font-size: 15px; }
.guide-shot .screenshot-placeholder { min-height: 360px; padding: 24px; }
.guide-shot figcaption { margin-top: 8px; color: var(--muted); font-size: 12px; text-align: center; }
.guide-result { margin-top: 24px; padding: 16px 20px; border-radius: 10px; background: var(--brand-soft); }
.guide-result strong { display: block; margin-bottom: 4px; }
.guide-result p { color: #6f3c36; font-size: 14px; }

@media (max-width: 1024px) {
  .header-inner { gap: 16px; }
  .primary-nav a { padding-inline: 12px; }
  .hero-grid { gap: 40px; }
  .story-grid, .product-grid, .product-grid-reverse { gap: 48px; }
  .scenario-grid, .scenario-grid-reverse { gap: 48px; }
  .guide-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 32px; }
  .guide-task-body { grid-template-columns: minmax(0, 1fr) 240px; gap: 24px; }
  .feature-grid { gap: 32px 24px; }
  .cta-panel { padding: 48px; }
  .page-hero-grid { gap: 32px; }
  .faq-shell { grid-template-columns: 240px minmax(0, 1fr); gap: 32px; }
}

@media (max-width: 800px) {
  html { scroll-padding-top: 80px; }
  .container { width: min(calc(100% - 32px), var(--container)); }
  .section { padding-block: 64px; }
  .header-inner { min-height: 72px; justify-content: space-between; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; order: 3; padding: 8px; border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--ink); }
  .menu-toggle:hover { background: var(--surface-soft); }
  .header-action { display: none; }
  .primary-nav { position: absolute; top: 72px; left: 0; right: 0; display: none; align-items: stretch; gap: 4px; margin: 0; padding: 16px; border-bottom: 1px solid var(--line); background: var(--surface); box-shadow: 0 16px 24px rgb(35 62 52 / 8%); }
  .primary-nav.is-open { display: flex; flex-direction: column; }
  .primary-nav a { min-height: 48px; display: flex; align-items: center; padding: 12px 16px; }
  .primary-nav a[aria-current="page"]::after { display: none; }
  .primary-nav a[aria-current="page"] { background: var(--brand-soft); }
  .nav-mobile-action { display: inline-flex; margin-top: 8px; }
  .hero { padding-block: 56px; }
  .hero-grid, .page-hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-copy { text-align: center; }
  .hero-copy .eyebrow, .hero-lead { margin-inline: auto; }
  .button-group, .hero-note { justify-content: center; }
  .value-list { grid-template-columns: 1fr; }
  .value-item { justify-content: flex-start; padding: 20px 0; }
  .value-item + .value-item { border-left: 0; border-top: 1px solid var(--line); }
  .space-grid, .feature-grid, .steps-list { grid-template-columns: 1fr; }
  .space-card { min-height: 0; }
  .card-number { margin-bottom: 24px; }
  .section-heading-split { display: block; }
  .section-heading-split .arrow-link { margin-top: 16px; }
  .story-grid, .product-grid, .product-grid-reverse { grid-template-columns: 1fr; gap: 40px; }
  .scenario-section { padding-block: 64px; }
  .scenario-grid, .scenario-grid-reverse { grid-template-columns: 1fr; gap: 40px; }
  .scenario-grid-reverse .scenario-panel { order: 2; }
  .scenario-grid-reverse .scenario-copy { order: 1; }
  .guide-layout { grid-template-columns: 1fr; padding-block: 40px 64px; }
  .guide-sidebar { position: static; }
  .guide-sidebar nav { display: flex; gap: 4px; overflow-x: auto; padding-bottom: 8px; }
  .guide-sidebar nav a { flex: none; }
  .guide-sidebar .button { width: auto; }
  .guide-task-body { grid-template-columns: 1fr; }
  .guide-shot { width: min(100%, 360px); margin-inline: auto; }
  .story-visual { order: 2; }
  .story-copy { order: 1; }
  .product-grid-reverse .product-visual { order: 2; }
  .product-grid-reverse .product-copy { order: 1; }
  .cta-panel { flex-direction: column; align-items: flex-start; padding: 40px; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer-brand { grid-column: 1 / -1; }
  .product-nav { top: 72px; }
  .page-hero { padding-block: 56px; }
  .page-hero-aside { max-width: 560px; }
  .faq-shell { grid-template-columns: 1fr; padding-block: 40px 64px; }
  .faq-sidebar { position: static; }
  .faq-categories { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 8px; }
  .faq-filter { flex: none; }
  .faq-help { display: none; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .brand-copy small { display: none; }
  .hero { padding-top: 40px; }
  .hero-copy { text-align: left; }
  .button-group { flex-direction: column; }
  .button-group .button { width: 100%; }
  .hero-note { justify-content: flex-start; align-items: flex-start; }
  .section-heading { margin-bottom: 32px; }
  .space-card { padding: 24px; }
  .story-visual { padding: 24px; }
  .steps-list li { gap: 16px; }
  .cta-panel { padding: 32px 24px; }
  .cta-panel .button { width: 100%; white-space: normal; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; }
  .footer-brand { grid-column: auto; }
  .qr-dialog { padding: 24px; }
  .dialog-header h2 { font-size: 21px; }
  .product-section { padding-block: 56px; }
  .scenario-panel { padding: 24px; }
  .scenario-copy .button-group { align-items: stretch; }
  .scenario-copy .button-group .arrow-link { justify-content: center; }
  .guide-task { padding: 24px; }
  .guide-task-header { gap: 12px; }
  .guide-number { width: 40px; height: 40px; }
  .guide-task-header h2 { font-size: 25px; }
  .guide-meta { grid-template-columns: 1fr; }
  .role-table th, .role-table td { padding: 10px 8px; }
  .faq-item summary { gap: 12px; padding: 16px; }
  .faq-answer { padding: 0 16px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* ============================================================
   背景视觉体系 v3 — 全站背景质感 + iconfont 插画回忆衬图
   层次：body 底光+噪点 → hero/page-hero 光晕 → 低透明插画漂浮层
   ============================================================ */

/* 1. 全站底色氛围：品牌色系柔和径向光（fixed，随视口，不随滚动重绘） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(900px 620px at 12% -5%, rgb(184 67 59 / 7%), transparent 65%),
    radial-gradient(1000px 720px at 88% 8%, rgb(70 104 90 / 8%), transparent 65%),
    radial-gradient(1200px 900px at 50% 108%, rgb(70 104 90 / 6%), transparent 70%);
}

/* 2. 细腻噪点 grain 覆盖层：SVG feTurbulence data-URI，极低透明度不伤可读性 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
  background-size: 180px 180px;
}

/* 3. Hero 首屏 aurora 光晕：赭红 + 鼠尾草绿低饱和柔光，缓慢漂移（仅 transform） */
.hero { position: relative; }
.hero::before, .hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
}
.hero::before {
  width: 720px;
  height: 720px;
  top: -300px;
  left: -230px;
  background: radial-gradient(circle, rgb(219 122 110 / 30%), rgb(219 122 110 / 10%) 46%, transparent 70%);
  animation: od-blob-drift-a 26s ease-in-out infinite alternate;
}
.hero::after {
  width: 640px;
  height: 640px;
  bottom: -270px;
  right: -190px;
  background: radial-gradient(circle, rgb(112 158 134 / 26%), rgb(112 158 134 / 9%) 46%, transparent 70%);
  animation: od-blob-drift-b 30s ease-in-out infinite alternate;
}
/* 第三个小光斑：右上淡粉，错落层次（放在 hero-grid 层内、内容之下） */
.hero-grid { position: relative; z-index: 1; }
.hero-grid::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -140px;
  right: 8%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgb(243 201 194 / 38%), transparent 68%);
  animation: od-blob-drift-a 34s ease-in-out infinite alternate-reverse;
}

/* 4. 保留手绘错落照片与枝条：以更低透明度衬托 iconfont 人物插画 */
.hero-grid::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -64px;
  bottom: -72px;
  width: 320px;
  aspect-ratio: 360 / 260;
  pointer-events: none;
  background: url("../images/decorations/photos-scatter.svg") center / contain no-repeat;
  opacity: .38;
  transform: rotate(3deg);
}
.hero-copy::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -100px;
  left: -116px;
  width: 190px;
  aspect-ratio: 1;
  pointer-events: none;
  background: url("../images/decorations/leaf-branch.svg") center / contain no-repeat;
  opacity: .58;
  transform: rotate(-12deg);
}

/* 5. iconfont 真实插画：家庭互动 + 相册整理，低透明融入首屏而非独立卡片 */
.hero-visual { position: relative; }
.hero-visual::before, .hero-visual::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
  will-change: transform;
}
.hero-visual::before {
  width: 176px;
  height: 176px;
  left: -58px;
  top: 14%;
  background-image: url("../images/decorations/iconfont-family-joy.svg");
  opacity: .55;
  animation: od-illustration-a 12s ease-in-out infinite alternate;
}
.hero-visual::after {
  width: 236px;
  height: 124px;
  right: -82px;
  bottom: 18%;
  background-image: url("../images/decorations/iconfont-album-organizing.svg");
  opacity: .44;
  animation: od-illustration-b 14s ease-in-out infinite alternate;
}

/* 6. 克制的光点粒子：极小、低透明度，缓慢明暗呼吸 */
.hero-copy { position: relative; }
.hero-copy::after {
  content: "";
  position: absolute;
  top: -4px;
  right: -12px;
  width: 220px;
  height: 190px;
  pointer-events: none;
  background:
    radial-gradient(3px 3px at 28px 42px, rgb(184 67 59 / 42%), transparent 70%),
    radial-gradient(2.5px 2.5px at 128px 24px, rgb(70 104 90 / 38%), transparent 70%),
    radial-gradient(2px 2px at 178px 96px, rgb(219 122 110 / 34%), transparent 70%),
    radial-gradient(2.5px 2.5px at 64px 128px, rgb(112 158 134 / 30%), transparent 70%);
  animation: od-twinkle 9s ease-in-out infinite;
}

/* 7. 子页面 page-hero：右上 iconfont 旅行插画 + 左下柔光呼吸 */
.page-hero { position: relative; overflow: hidden; }
.page-hero-grid { position: relative; z-index: 1; }
.page-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -52px;
  right: 24px;
  width: 174px;
  height: 261px;
  pointer-events: none;
  background: url("../images/decorations/iconfont-travel-moment.svg") center / contain no-repeat;
  opacity: .32;
  transform: rotate(4deg);
}
.page-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  bottom: -240px;
  left: -180px;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
  background: radial-gradient(circle, rgb(112 158 134 / 20%), transparent 68%);
  animation: od-blob-drift-b 32s ease-in-out infinite alternate;
}

/* 8. CTA 面板：深绿底上叠加暖光，增加纵深（纯背景层，不新增元素） */
.cta-panel {
  background:
    radial-gradient(560px 360px at 84% 16%, rgb(255 255 255 / 9%), transparent 64%),
    radial-gradient(500px 340px at 6% 92%, rgb(184 67 59 / 20%), transparent 68%),
    var(--sage-dark);
}

/* --- 关键帧：只动 transform / opacity，GPU 合成友好 --- */
@keyframes od-blob-drift-a {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(42px, 30px, 0) scale(1.06); }
}
@keyframes od-blob-drift-b {
  from { transform: translate3d(0, 0, 0) scale(1.05); }
  to { transform: translate3d(-48px, -26px, 0) scale(1); }
}
@keyframes od-illustration-a {
  from { transform: rotate(-5deg) translate3d(0, 0, 0); }
  to { transform: rotate(-3deg) translate3d(8px, -14px, 0); }
}
@keyframes od-illustration-b {
  from { transform: rotate(4deg) translate3d(0, 0, 0); }
  to { transform: rotate(2deg) translate3d(-6px, 12px, 0); }
}
@keyframes od-twinkle {
  0%, 100% { opacity: .45; }
  50% { opacity: 1; }
}

/* --- 响应式降级：移动端收敛重效果 --- */
@media (max-width: 1024px) {
  .hero-visual::before { left: -28px; width: 146px; height: 146px; }
  .hero-visual::after { right: -34px; width: 190px; height: 100px; }
}
@media (max-width: 800px) {
  .hero::before { width: 440px; height: 440px; top: -220px; left: -170px; opacity: .8; }
  .hero::after { width: 420px; height: 420px; bottom: -210px; right: -150px; opacity: .75; }
  .hero-grid::before, .hero-grid::after { display: none; }
  .hero-visual::before, .hero-visual::after { display: none; }
  .hero-copy::before { display: none; }
  .hero-copy::after { right: 8px; }
  .page-hero::before { width: 116px; height: 174px; top: -12px; right: -22px; opacity: .28; }
  .page-hero::after { width: 420px; height: 420px; bottom: -190px; left: -150px; }
}
@media (max-width: 480px) {
  .hero::before, .hero::after { opacity: .6; }
  .hero-copy::after, .page-hero::before { display: none; }
  body::after { opacity: .03; }
}

/* --- 无障碍：用户偏好减少动效时，背景装饰完全静止 --- */
@media (prefers-reduced-motion: reduce) {
  .hero::before, .hero::after, .hero-grid::before, .hero-visual::before, .hero-visual::after, .hero-copy::after, .page-hero::after { animation: none !important; }
}