:root {
  --brand: #C11128; --red: #C0001C; --wine: #9E0018; --ink: #252525; --muted: #3a3a3a;
  --warm: #faf7f4; --blush: #FDF1F2; --rose: #FBE6E8; --line: #e5dfd9; --white: #fff;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", "思源黑体", "Helvetica Neue", Arial, sans-serif;
  --body-size: 19px; --aux-size: 16px; --label-size: 18px; --button-size: 18px;
  --h1-size: 60px; --home-title-size: 72px; --h2-size: 48px; --h3-size: 26px;
  --section-space: 54px; --card-space: 44px; --radius: 24px; --header-height: 92px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; font-family: var(--font); font-synthesis: weight; scroll-behavior: smooth; scroll-padding-top: 112px; }
body { margin: 0; color: var(--ink); background: var(--white); font: 400 var(--body-size)/1.8 var(--font); text-rendering: optimizeLegibility; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; font-family: inherit; }
input::placeholder, textarea::placeholder { font-family: inherit; color: var(--muted); opacity: 1; }
button, a, input, textarea { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: wait; background: var(--warm); color: var(--muted); border-color: var(--line); }
:focus-visible { outline: 3px solid var(--red); outline-offset: 5px; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }
figure, h1, h2, h3, p { margin: 0; }
p, li { font-size: var(--body-size); line-height: 1.8; font-weight: 400; letter-spacing: 0; }
p { max-width: 36em; }
p + p { margin-top: 20px; }
h1, h2, h3 { text-wrap: balance; overflow-wrap: break-word; line-height: 1.25; letter-spacing: 0; }
h1 { font-size: var(--h1-size); font-weight: 800; }
h2 { font-size: var(--h2-size); font-weight: 800; }
h3 { font-size: var(--h3-size); font-weight: 700; }
.title-line { display: block; }
.phrase { display: inline-block; max-width: 100%; }
.container { width: min(1320px, calc(100% - 96px)); margin-inline: auto; }
.section { padding-block: var(--section-space); }
.warm { background: var(--warm); }
.dark { background: var(--blush); }
.eyebrow { display: block; color: var(--wine); font-size: var(--label-size); letter-spacing: .06em; font-weight: 700; margin-bottom: 20px; }
.section-heading { margin-bottom: 52px; }
.section-heading::before { content: ""; display: block; width: 56px; height: 6px; border-radius: 3px; background: var(--red); margin-bottom: 28px; }
.section-intro { margin-top: 28px; color: var(--muted); font-weight: 500; }
.number { color: var(--wine); font-size: var(--label-size); font-weight: 700; letter-spacing: 0; font-variant-numeric: tabular-nums; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
[hidden] { display: none !important; }
/* 96% 白底，胶囊为不透明暖白；毛玻璃只用于导航背景。 */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96); backdrop-filter: blur(16px); }
.site-header.is-scrolled { box-shadow: 0 6px 24px rgba(158,0,24,.08); }
.header-inner { width: min(1320px, calc(100% - 96px)); height: var(--header-height); display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-inline: auto; }
.brand { display: inline-flex; align-items: center; flex-shrink: 0; }
.brand img { width: auto; height: 58px; object-fit: contain; }
.brand small { color: var(--wine); font-size: var(--label-size); font-weight: 700; letter-spacing: .06em; }
/* v6：B 分段胶囊，在 Logo 右侧可用区域居中。 */
.nav-zone { display: flex; flex: 1; min-width: 0; justify-content: center; }
#main-nav { display: flex; flex-shrink: 0; align-items: center; gap: 2px; padding: 5px; border: 1px solid var(--rose); border-radius: 999px; background: var(--warm); }
.nav-group { display: flex; align-items: center; gap: 2px; }
.nav-group-label { display: none; }
#main-nav a { position: relative; display: flex; align-items: center; justify-content: center; flex-shrink: 0; min-height: 48px; padding-inline: 13px; border-radius: 999px; font-size: 17px; font-weight: 600; white-space: nowrap; transition: background .2s, color .2s; }
#main-nav a:hover { color: var(--wine); background: var(--blush); }
#main-nav a[aria-current] { color: var(--white); background: var(--brand); }
#main-nav a:focus-visible { outline: 3px solid var(--wine); outline-offset: 2px; }
.nav-group + .nav-group { border-left: 1px solid #dcb8be; padding-left: 7px; margin-left: 5px; }
@media (min-width: 1251px) {
  :root { --header-height: 84px; }
  .header-inner { gap: 0; }
}
@media (min-width: 1251px) and (max-width: 1359px) {
  #main-nav a { padding-inline: 8px; }
}
.menu-toggle { flex-shrink: 0; display: none; width: 54px; height: 54px; border: 1px solid var(--line); background: var(--white); border-radius: 12px; padding: 14px 11px; font-size: var(--button-size); }
.menu-toggle span { display: block; height: 3px; background: var(--red); margin: 5px 0; }
/* 首屏：左侧语义断行，右侧完整 16:9 视频位。 */
.hero, .page-hero { background: var(--warm); padding-block: var(--section-space); }
.home-hero { display: flex; align-items: center; }
.hero-grid { display: grid; grid-template-columns: minmax(0,5fr) minmax(0,7fr); gap: 32px; align-items: center; }
.hero-copy { min-width: 0; }
.home-hero .hero-grid { container-type: inline-size; }
.hero-copy .eyebrow { margin-bottom: 28px; }
.home-hero h1 { font-size: var(--home-title-size); margin-bottom: 28px; }
.home-hero h1 .title-line:last-child { color: var(--red); }
.hero-subtitle { font-weight: 600; margin-top: 24px; }
.hero-description { margin-top: 24px; color: var(--muted); font-weight: 500; }
.hero-bottom { margin-top: 32px; color: var(--muted); font-weight: 500; }
.hero-visual { min-width: 0; width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius); overflow: hidden; box-shadow: 0 24px 60px rgba(158,0,24,.12); }
.product-hero h1 .title-line:first-child { color: var(--red); }
.page-hero .hero-description { max-width: 36em; }
.video-slot { position: relative; background: linear-gradient(130deg, var(--red), var(--wine)); }
.video-slot > img, .video-slot video { width: 100%; height: 100%; object-fit: cover; }
.video-slot video { object-fit: contain; }
.video-placeholder::after { content: ""; position: absolute; inset: 0; background: linear-gradient(130deg,rgba(192,0,28,.06),rgba(158,0,24,.35)); }
.media-brand { position: absolute; z-index: 1; right: 24px; bottom: 24px; padding: 10px; background: var(--white); border-radius: 18px; }
.media-brand img { width: 64px; height: 64px; object-fit: contain; }
.video-play { display: none; position: absolute; inset: 0; margin: auto; width: 88px; height: 88px; padding: 22px; border-radius: 50%; border: 3px solid var(--white); color: var(--white); background: var(--red); font-size: 18px; font-weight: 700; box-shadow: 0 8px 35px rgba(158,0,24,.2); }
.js-ready .video-play { display: grid; place-items: center; }
.video-play svg { width: 36px; height: 36px; }
/* 按钮仅改变颜色，不移动含文字的元素。 */
.actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 20px; min-height: 62px; border: 2px solid var(--red); background: var(--red); color: var(--white); padding: 15px 34px; font-size: var(--button-size); font-weight: 700; line-height: 1.5; border-radius: 12px; transition: background .2s, border-color .2s; }
.button:hover { background: var(--wine); border-color: var(--wine); }
.button span { font-size: inherit; font-weight: 700; line-height: 1; }
.button-ghost, .button-light { background: var(--white); color: var(--wine); border-color: var(--red); }
.button-ghost:hover, .button-light:hover { color: var(--wine); background: var(--blush); }
.button-text { background: transparent; border: 0; color: var(--wine); justify-content: space-between; width: 100%; padding-inline: 0; }
.button-text:hover { color: var(--red); background: transparent; }
/* 分区和卡片 */
.pain-grid, .card-grid, .systems-grid, .business-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 32px; }
.card, .pain-card, .system-card, .start-card, .business-grid article { background: var(--white); border: 0; border-radius: var(--radius); min-width: 0; box-shadow: 0 12px 40px rgba(158,0,24,.05); }
.card, .pain-card, .business-grid article { padding: var(--card-space); }
.card .number, .pain-card .number { display: block; margin-bottom: 28px; }
.card h3 { margin: 24px 0 20px; }
.card h3:empty { display: none; }
.card p, .system-content p { color: var(--muted); }
.system-card { display: flex; flex-direction: column; overflow: hidden; }
.system-image { display: block; height: 240px; overflow: hidden; }
.system-content { padding: 40px; display: flex; flex-direction: column; flex: 1; }
.system-content h3 { margin-bottom: 24px; }
.system-content p { margin-bottom: 28px; }
.system-content .button { margin-top: auto; }
.systems-section { padding-top: 0; }
.red-band { background: linear-gradient(115deg,var(--red),var(--wine)); color: var(--white); padding-block: var(--section-space); margin-bottom: 40px; }
.red-band .section-heading { margin-bottom: 0; }
.red-band .section-heading::before { background: var(--white); }
.red-band .eyebrow { color: var(--white); font-size: 18px; }
.red-band h2 { font-weight: 800; }
.feature-split, .process-teaser, .contact-intro, .company-story, .editorial-module { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 72px; align-items: center; }
.feature-split p { color: var(--muted); margin-bottom: 32px; }
.feature-image, .company-story figure, .editorial-module figure { height: 390px; border-radius: var(--radius); overflow: hidden; }
.heading-link { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.heading-link span { color: var(--red); }
.heading-link:hover { color: var(--red); }
.process-teaser p { color: var(--muted); margin-bottom: 0; }
.statement { font-size: 30px; font-weight: 600; line-height: 1.5; text-wrap: balance; margin: 0 0 48px; max-width: 32em; letter-spacing: 0; }
.four, .pain-cards { grid-template-columns: repeat(2,minmax(0,1fr)); }
.line-icon { width: 44px; height: 44px; color: var(--red); display: block; }
.benefits .card p { margin-top: 24px; }
.ai-business-panel { padding: 40px 48px; background: var(--white); border-radius: var(--radius); }
.ai-business-row { display: grid; grid-template-columns: 1fr 64px 1fr; align-items: center; gap: 24px; padding: 28px 0; font-size: 26px; }
.ai-scene { color: var(--muted); }
.ai-business-arrow { color: var(--red); text-align: center; }
.ai-result { font-weight: 600; }
.ai-business-emphasis { margin-top: 24px; padding: 28px; background: var(--blush); border-radius: 16px; }
.ai-business-emphasis p { max-width: none; }
.ai-business-emphasis p + p { margin-top: 12px; color: var(--wine); font-weight: 600; }
.module-grid .card { background: var(--warm); box-shadow: none; }
.module-grid .card .number { font-size: 60px; font-weight: 700; line-height: 1.25; }
.editorial-module .number { font-size: 40px; font-weight: 700; line-height: 1.25; }
.editorial-modules { display: grid; gap: 80px; }
.editorial-module:nth-child(even) figure { order: 2; }
.editorial-module h3 { font-size: 28px; margin: 20px 0 24px; }
.editorial-module p { color: var(--muted); }
/* 所有页尾共用整块福能红 CTA。 */
.cta { background: linear-gradient(115deg,var(--red),var(--wine)); color: var(--white); }
.cta-inner { display: grid; grid-template-columns: minmax(0,1fr) 300px; align-items: center; gap: 64px; }
.cta .eyebrow { color: var(--white); font-size: 18px; }
.cta-copy { font-size: var(--h2-size); font-weight: 800; line-height: 1.25; text-wrap: balance; max-width: none; letter-spacing: 0; }
.cta-subcopy { margin-top: 28px; }
.cta p { color: var(--white); font-weight: 600; }
.cta-subcopy p { max-width: none; text-wrap: balance; }
.cta-subcopy p + p { margin-top: 12px; }
.cta .actions { margin-top: 0; flex-direction: column; align-items: stretch; }
.cta .button { justify-content: space-between; background: var(--wine); color: var(--white); border-color: var(--white); }
.cta .button:hover { background: var(--red); }
.cta .button:first-child { background: var(--white); color: var(--wine); }
.cta .button:first-child:hover { background: var(--blush); }
.cta-tail { margin-top: 24px; }
/* 公司与流程 */
.company-lead { margin-bottom: 80px; }
.company-lead p, .company-story-copy p { font-size: 20px; }
.company-stories { display: grid; gap: 80px; }
.company-story:nth-child(even) figure { order: -1; }
.company-story-copy { color: var(--muted); }
.advantage-list { display: grid; gap: 32px; }
.advantage-row { display: grid; grid-template-columns: 100px 1fr; gap: 32px; padding: 44px; background: var(--white); border-radius: var(--radius); }
.advantage-row .number { font-size: 60px; line-height: 1.25; font-weight: 700; }
.advantage-row h3 { margin-bottom: 24px; }
.advantage-row p { max-width: 46em; color: var(--muted); }
.timeline { margin: 0 auto; padding: 0; list-style: none; max-width: 1120px; display: grid; gap: 32px; }
.step { display: grid; grid-template-columns: 88px 1fr; gap: 40px; padding: 44px; background: var(--white); border-radius: var(--radius); }
.step-index { display: grid; place-items: center; width: 80px; height: 80px; border-radius: 20px; background: var(--blush); color: var(--wine); font-size: 40px; font-weight: 700; }
.step h2 { font-size: 40px; margin-bottom: 24px; }
.step-body > p { color: var(--muted); max-width: 42em; }
.step-body .deliverable { margin-top: 28px; background: var(--warm); padding: 20px 24px; color: var(--muted); font-weight: 500; border-radius: 12px; max-width: none; }
/* 联系表单与功能性提示 */
.contact-hero { background: var(--white); }
.start-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.start-card { padding: 40px; }
.start-card h3 { margin-bottom: 16px; color: var(--wine); }
.contact-intro .start-emphasis { font-weight: 600; color: var(--ink); margin-top: 32px; text-wrap: balance; }
.contact-intro p, .text-list { color: var(--muted); }
.text-list { list-style: none; padding: 0; margin: 0; }
.text-list li { position: relative; padding-left: 32px; margin-bottom: 24px; }
.text-list li::before { content: ""; position: absolute; left: 0; top: .65em; width: 12px; height: 12px; border-radius: 50%; background: var(--red); }
.consultation-section { background: var(--warm); }
.form-layout { display: grid; grid-template-columns: minmax(0,1.9fr) minmax(0,1fr); gap: 32px; align-items: start; }
.form-card { padding: 48px; background: var(--white); border-radius: var(--radius); }
.form-card .section-heading { margin-bottom: 40px; }
.contact-sidebar { display: grid; gap: 28px; min-width: 0; }
.contact-ai-card { padding: 40px; background: var(--blush); border-radius: var(--radius); }
.contact-ai-card .line-icon { width: 52px; height: 52px; margin: 24px 0; }
.contact-ai-card h2 { font-size: 40px; margin-bottom: 24px; }
.contact-ai-card p { color: var(--muted); }
.contact-ai-card .button { margin-top: 32px; width: 100%; padding-inline: 24px; }
.contact-ai-card .button { white-space: nowrap; }
.contact-ai-card .button + .button { margin-top: 16px; }
.contact-ai-card .button-human { background: var(--white); color: var(--red); border-color: var(--red); }
.contact-ai-card .button-human:hover { background: var(--blush); }
.human-contact-feedback { margin-top: 24px; }
.human-contact-feedback a { display: inline-flex; align-items: center; min-height: 48px; color: var(--wine); font-weight: 600; text-decoration: underline; text-underline-offset: 4px; }
.contact-cards { display: grid; padding: 8px 32px; background: var(--white); border-radius: var(--radius); }
.contact-cards .contact-item { padding: 24px 0; display: grid; gap: 8px; }
.contact-cards .contact-item > span:first-child { color: var(--muted); font-size: var(--aux-size); font-weight: 500; }
[data-contact] { overflow-wrap: anywhere; min-width: 0; }
.contact-cards [data-contact] { font-size: var(--body-size); font-weight: 600; }
form { min-width: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.field { display: grid; gap: 12px; margin-bottom: 28px; min-width: 0; }
.field label, .system-choices legend { font-size: var(--body-size); font-weight: 600; }
.field label > span, .system-choices legend > span { color: var(--wine); }
.field input, .field textarea { width: 100%; min-width: 0; background: var(--warm); border: 1px solid #b6aaa0; border-radius: 12px; min-height: 60px; padding: 15px 18px; color: var(--ink); }
.field textarea { resize: vertical; line-height: 1.8; }
.field-error { color: var(--wine); font-size: var(--aux-size); font-weight: 500; line-height: 1.8; }
.field-error:empty { display: none; }
[aria-invalid="true"] { border-color: var(--red); }
.system-choices { margin: 0 0 28px; padding: 0; border: 0; min-width: 0; }
.system-choices legend { margin-bottom: 16px; padding: 0; }
.choice-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.choice-grid label { display: flex; align-items: center; padding: 12px 16px; border: 1px solid #b6aaa0; border-radius: 12px; min-height: 58px; cursor: pointer; font-size: var(--body-size); }
.choice-grid label:has(input:checked) { border-color: var(--red); background: var(--blush); }
.choice-grid input { accent-color: var(--red); width: 20px; height: 20px; margin: 0 12px 0 0; flex-shrink: 0; }
.system-choices .field-error { display: block; margin-top: 12px; }
.form-feedback { margin-top: 24px; }
.form-feedback #form-help { display: flex; gap: 16px; margin-top: 16px; flex-wrap: wrap; }
.contact-slogan { text-align: center; }
.contact-slogan p { max-width: none; margin-top: 24px; }
/* 浅暖白页脚 */
.site-footer { background: var(--warm); color: var(--ink); padding: 88px 0 32px; }
.footer-top { display: grid; grid-template-columns: 1.7fr 1fr; gap: 64px; }
.footer-brand .brand { margin-bottom: 32px; }
.footer-brand .brand img { height: 64px; }
.footer-slogan { color: var(--ink); font-weight: 600; }
.footer-brand p:not(.footer-slogan) { color: var(--muted); margin-top: 16px; }
.site-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 28px; align-content: start; }
.site-footer nav a { font-size: 17px; font-weight: 500; color: var(--muted); min-height: 48px; display: flex; align-items: center; }
.site-footer nav a:hover { color: var(--wine); text-decoration: underline; text-underline-offset: 6px; }
.footer-contact p { color: var(--muted); margin-bottom: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.footer-bottom { margin-top: 56px; padding-top: 24px; display: flex; justify-content: space-between; color: var(--muted); font-size: var(--aux-size); font-weight: 500; letter-spacing: 0; }
.footer-bottom > span:last-child { color: var(--wine); font-size: var(--label-size); font-weight: 700; }
.beian { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px 28px; padding-top: 28px; font-size: var(--aux-size); font-weight: 500; }
.beian a { display: inline-flex; align-items: center; gap: 8px; color: var(--wine); }
.beian svg { width: 20px; height: 20px; }
/* AI 咨询：不透明文字背景和稳定定位 */
.ai-float { position: fixed; z-index: 25; right: 28px; bottom: 28px; display: flex; align-items: center; gap: 12px; min-height: 62px; padding: 15px 28px; background: var(--red); color: var(--white); border: 0; border-radius: 32px; box-shadow: 0 6px 24px rgba(158,0,24,.12); font-size: 18px; font-weight: 700; }
.ai-float:hover { background: var(--wine); }
.ai-float svg { width: 26px; height: 26px; }
.mobile-actions { display: none; }
#ai-panel { position: fixed; inset: auto 24px 24px auto; margin: 0; padding: 0; border: 1px solid var(--line); width: 460px; max-width: calc(100% - 32px); border-radius: var(--radius); background: var(--white); color: var(--ink); box-shadow: 0 24px 80px rgba(158,0,24,.16); }
#ai-panel::backdrop { background: rgba(158,0,24,.14); }
.ai-header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 24px; }
.ai-header .eyebrow { margin-bottom: 8px; }
.ai-header h2 { font-size: 28px; }
.icon-button { height: 54px; width: 54px; border-radius: 50%; border: 1px solid var(--line); background: var(--white); color: var(--wine); font-size: 18px; font-weight: 700; line-height: 1; }
.ai-messages { padding: 24px; height: 300px; overflow: auto; overscroll-behavior: contain; display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
.message { margin: 0; padding: 14px 18px; border-radius: 4px 16px 16px; background: var(--warm); max-width: 92%; flex-shrink: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user { background: var(--blush); color: var(--ink); align-self: flex-end; border-radius: 16px 4px 16px 16px; font-weight: 500; }
.ai-contact-link { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; min-height: 54px; color: var(--wine); font-size: var(--aux-size); font-weight: 600; }
#ai-form { padding: 20px; background: var(--warm); display: flex; align-items: center; gap: 12px; }
#ai-input { width: 100%; min-width: 0; resize: none; border: 1px solid #b6aaa0; background: var(--white); border-radius: 12px; padding: 12px; font-size: var(--body-size); color: var(--ink); }
#ai-send { padding-inline: 20px; flex-shrink: 0; }
/* 内容始终清晰可见；滚动不改变文本 opacity 或 transform。 */
@media (max-width: 1250px) {
  .menu-toggle { display: block; }
  .nav-zone { display: contents; }
  #main-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; margin: 0; padding: 20px 32px 100px; border: 0; border-radius: 0 0 24px 24px; background: var(--white); box-shadow: 0 12px 24px rgba(158,0,24,.07); max-height: calc(100dvh - var(--header-height)); overflow: auto; overscroll-behavior: contain; }
  #main-nav.is-open { display: flex; flex-direction: column; align-items: stretch; gap: 20px; }
  .nav-group { flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-group + .nav-group { border-left: 0; padding-left: 0; margin-left: 0; border-top: 1px solid var(--line); padding-top: 18px; }
  .nav-group-label { display: block; color: var(--wine); font-size: 16px; font-weight: 700; margin: 0 16px 8px; }
  #main-nav a { justify-content: space-between; font-size: 22px; min-height: 54px; padding: 6px 16px; border-radius: 14px; }
  #main-nav a::after { position: static; content: "↗"; height: auto; background: transparent; width: auto; font-size: 20px; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .hero-grid { gap: 32px; }
  .feature-split, .process-teaser, .contact-intro, .company-story, .editorial-module { gap: 40px; }
  .systems-grid, .card-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .cta-inner { grid-template-columns: 1fr; gap: 40px; }
  .cta .actions { flex-direction: row; }
  .form-card { padding: 32px; }
}
@media (max-width: 1000px) {
  :root { --section-space: 36px; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    .title-line { white-space: normal; }
  .hero-visual { max-width: 800px; justify-self: center; }
  .pain-grid, .business-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .form-layout { grid-template-columns: 1fr; }
}
/* 首页桌面标题保持两行；字号按首屏容器缩放。 */
@media (min-width: 1001px) {
  .company-hero .hero-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (min-width: 1101px) {
  .home-hero h1 { font-size: 64px; font-size: clamp(60px, 4.85cqw, 64px); }
  .home-hero h1 .title-line { white-space: nowrap; }
  .home-hero .hero-grid { grid-template-columns: minmax(0, .8fr) minmax(620px, 1fr); gap: 24px; }
}
@media (min-width: 1101px) and (max-width: 1279px) {
  .home-hero .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .home-hero .hero-visual { width: 100%; max-width: 800px; }
}
@media (max-width: 760px) {
  :root { --body-size: 17px; --aux-size: 15px; --label-size: 16px; --button-size: 18px; --h1-size: 40px; --home-title-size: 42px; --h2-size: 32px; --h3-size: 24px; --section-space: 32px; --card-space: 28px; --radius: 20px; --header-height: 80px; }
  html { scroll-padding-top: 100px; }
  body { padding-bottom: calc(78px + env(safe-area-inset-bottom)); }
  .container, .header-inner { width: calc(100% - 40px); }
  .brand img { height: 44px; }
  #main-nav { padding-inline: 24px; }
  .section-heading { margin-bottom: 32px; }
  .section-heading::before { width: 44px; margin-bottom: 20px; }
  .hero, .page-hero { padding-block: var(--section-space); }
  .hero-grid { gap: 36px; }
  .hero-copy .eyebrow { margin-bottom: 20px; }
  .home-hero h1 { margin-bottom: 24px; }
  .hero-subtitle, .hero-description { margin-top: 20px; }
  .hero-bottom { margin-top: 24px; }
  .hero-visual { max-width: none; }
  .media-brand { right: 16px; bottom: 16px; padding: 8px; border-radius: 14px; }
  .media-brand img { width: 48px; height: 48px; }
  .video-play { width: 72px; height: 72px; padding: 16px; }
  .actions { margin-top: 28px; gap: 12px; }
  .button { min-height: 56px; padding: 12px 24px; gap: 14px; }
  .home-hero .actions { display: grid; grid-template-columns: 1fr; }
  .pain-grid, .card-grid, .systems-grid, .business-grid { grid-template-columns: 1fr; gap: 24px; }
  .card .number, .pain-card .number { margin-bottom: 20px; }
  .card h3 { margin-top: 20px; }
  .system-image { height: auto; aspect-ratio: 16 / 9; }
  .system-content { padding: 28px; }
  .systems-section { padding-top: 0; }
  .red-band { padding-block: var(--section-space); margin-bottom: 32px; }
  .feature-split, .process-teaser, .contact-intro, .company-story, .editorial-module, .cta-inner { grid-template-columns: 1fr; gap: 36px; }
  .feature-image, .company-story figure, .editorial-module figure { height: auto; aspect-ratio: 16 / 9; }
  .statement { font-size: 26px; margin-bottom: 32px; }
  .section-intro { margin-top: 20px; }
  .ai-business-panel { padding: 24px; }
  .ai-business-row { grid-template-columns: minmax(0,1fr) 20px minmax(0,1fr); gap: 8px; padding: 20px 0; font-size: 18px; }
  .ai-business-emphasis { padding: 20px; }
  .editorial-modules { gap: 48px; }
  .editorial-module:nth-child(even) figure, .company-story:nth-child(even) figure { order: 0; }
  .editorial-module h3 { font-size: 24px; }
  .cta-copy { font-size: 32px; }
  .cta p { font-size: 18px; }
  .cta .actions { flex-direction: column; gap: 16px; }
  .company-lead { margin-bottom: 40px; }
  .company-lead p, .company-story-copy p { font-size: 18px; }
  .company-stories { gap: 48px; }
  .advantage-row { grid-template-columns: 1fr; gap: 20px; padding: 28px; }
  .advantage-row .number, .module-grid .card .number { font-size: 44px; }
  .step { grid-template-columns: 1fr; gap: 24px; padding: 28px; }
  .step-index { width: 64px; height: 64px; font-size: 40px; }
  .step h2 { font-size: 28px; }
  .step-body .deliverable { padding: 20px; }
  .start-card { padding: 28px; }
  .contact-intro .start-emphasis { margin-top: 24px; }
  .form-grid { grid-template-columns: 1fr; gap: 0; }
  .form-card { padding: 28px 24px; }
  .contact-ai-card { padding: 28px; }
  .contact-ai-card h2 { font-size: 32px; }
  .contact-cards { padding-inline: 24px; }
  .choice-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 64px 0 28px; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .footer-brand .brand img { height: 56px; }
  .site-footer nav { gap: 8px 16px; }
  .site-footer nav a { font-size: 17px; }
  .footer-bottom { margin-top: 32px; gap: 16px; flex-wrap: wrap; }
  .beian { align-items: flex-start; flex-direction: column; }
  .ai-float { display: none; }
  .mobile-actions { display: grid; grid-template-columns: 1fr 1.2fr; gap: 12px; position: fixed; bottom: 0; left: 0; right: 0; background: var(--white); z-index: 25; padding: 12px 20px calc(12px + env(safe-area-inset-bottom)); box-shadow: 0 -4px 20px rgba(158,0,24,.06); }
  .mobile-actions > * { display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 54px; font-size: 18px; font-weight: 700; border-radius: 12px; }
  .mobile-actions button { border: 2px solid var(--red); background: var(--white); color: var(--wine); }
  .mobile-actions a { background: var(--red); color: var(--white); }
  #ai-panel { inset: auto 16px calc(94px + env(safe-area-inset-bottom)) 16px; width: auto; max-width: none; max-height: calc(100dvh - 120px); }
  .ai-header { padding: 20px; }
  .ai-messages { height: min(280px,32dvh); padding: 20px; }
  #ai-form { padding: 16px; }
  #ai-send { padding-inline: 16px; }
}
/* 360px 安卓：保留可读字号，按短语换行，不挤压菜单。 */
@media (max-width: 375px) {
  :root { --h1-size: 36px; --home-title-size: 38px; }
  .header-inner { gap: 16px; }
}
@media (min-width: 761px) {
  .footer-top:has(> .footer-contact:not([hidden])) { grid-template-columns: 1.5fr 1fr .8fr; }
  .footer-top:has(> .footer-contact:not([hidden])) nav { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
html:not(.js-ready) .ai-float, html:not(.js-ready) .mobile-actions button { display: none; }
html:not(.js-ready) .mobile-actions { grid-template-columns: 1fr; }
@media (max-width: 1250px) {
  html:not(.js-ready) .site-header { position: static; }
  html:not(.js-ready) .header-inner { height: auto; flex-wrap: wrap; padding-block: 20px; }
  html:not(.js-ready) .menu-toggle { flex-shrink: 0; display: none; }
  html:not(.js-ready) #main-nav { display: flex; position: static; width: 100%; flex-direction: column; align-items: stretch; padding: 0; gap: 8px; box-shadow: none; max-height: none; }
}