:root {
  --red: #C0001C; --wine: #9E0018; --ink: #2B2B2B; --muted: #60616a;
  --warm: #faf7f4; --line: #e5dfd9; --blush: #FDF1F2; --rose: #FBE6E8; --white: #fff;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 110px; }
body { margin: 0; color: var(--ink); background: #fff; font: 17px/1.8 var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
button, a, input, textarea { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .65; }
: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 { max-width: 36em; }
p + p { margin-top: 20px; }
h1, h2, h3 { text-wrap: balance; overflow-wrap: break-word; line-height: 1.35; letter-spacing: -.045em; }
h1 { font-size: clamp(48px, 4.65vw, 68px); font-weight: 750; line-height: 1.24; }
h2 { font-size: clamp(30px, 2.8vw, 42px); font-weight: 700; }
h3 { font-size: 23px; font-weight: 650; line-height: 1.5; }
.title-line { display: block; white-space: nowrap; }
.phrase { display: inline-block; white-space: nowrap; }
.container { width: min(1248px, calc(100% - 112px)); margin-inline: auto; }
.section { padding: 104px 0; }
.warm { background: var(--warm); }
.dark { background: var(--blush); color: var(--ink); }
.eyebrow { display: block; color: var(--red); font-size: 12px; letter-spacing: .16em; font-weight: 700; margin-bottom: 18px; }
.dark .eyebrow { color: var(--red); }
.section-heading { margin-bottom: 44px; }
.section-intro { margin-top: 24px; color: var(--muted); }
.number { color: var(--red); font-size: 15px; font-weight: 600; letter-spacing: .06em; 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; }
/* 导航 */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.97); border-bottom: 1px solid #eee9e4; }
.header-inner { width: min(1328px, calc(100% - 64px)); height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 30px; margin-inline: auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; line-height: 1.25; font-size: 22px; font-weight: 750; letter-spacing: .035em; }
.brand img { width: 44px; height: 44px; border-radius: 50%; }
.brand small { display: block; font-size: 9px; font-weight: 600; letter-spacing: .15em; margin-top: 5px; }
#main-nav { display: flex; gap: clamp(16px, 1.5vw, 24px); align-items: center; }
#main-nav a { position: relative; display: flex; align-items: center; min-height: 48px; font-size: 14px; font-weight: 550; white-space: nowrap; }
#main-nav a::after { content: ""; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--red); transform: scaleX(0); transition: transform .2s; }
#main-nav a:hover, #main-nav a[aria-current] { color: var(--red); }
#main-nav a[aria-current]::after, #main-nav a:hover::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 48px; height: 48px; border: 1px solid var(--line); background: #fff; border-radius: 4px; padding: 14px 11px; }
.menu-toggle span { display: block; height: 2px; background: var(--red); margin: 5px 0; transition: transform .2s; }
/* 首屏 */
.hero { background: var(--warm); padding: 78px 0 84px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.13fr 1fr; gap: 60px; align-items: center; }
.hero-copy { min-width: 0; }
.hero-copy .eyebrow { margin-bottom: 26px; }
.home-hero h1 { margin-bottom: 26px; }
.home-hero h1 .title-line:last-child { color: var(--red); }
.hero-subtitle { font-size: 21px; font-weight: 600; margin-top: 22px; line-height: 1.65; max-width: 27em; }
.hero-description { margin-top: 24px; color: var(--muted); max-width: 34em; }
.hero-bottom { font-size: 14px; margin-top: 32px; color: var(--muted); display: flex; align-items: center; gap: 12px; }
.hero-bottom::before { content: ""; width: 28px; height: 1px; background: var(--red); }
.hero-visual { position: relative; min-width: 0; height: 494px; border-radius: 5px 5px 50px 5px; overflow: hidden; box-shadow: 0 24px 60px rgba(44,21,21,.12); }
.hero-visual img { object-position: 48% center; }
.product-hero { padding-top: 80px; }
.product-hero h1 .title-line:first-child { font-size: .62em; color: var(--red); margin-bottom: 10px; }
.product-hero .hero-visual { height: 454px; }
.page-hero { background: var(--warm); padding: 82px 0 90px; }
.page-hero .hero-description { font-size: 18px; max-width: 36em; }
/* 按钮 */
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 22px; min-height: 52px; border: 1px solid var(--red); background: var(--red); color: #fff; padding: 12px 22px; font-size: 16px; font-weight: 600; line-height: 1.5; border-radius: 3px; transition: background .2s, border-color .2s; }
.button:hover { background: var(--wine); border-color: var(--wine); }
.button span { font-size: 21px; font-weight: 400; line-height: 1; }
.button-ghost { background: #fff; color: var(--red); border-color: var(--red); }
.button-ghost:hover { color: var(--red); background: #fff; border-color: var(--red); }
.button-light { background: #fff; color: var(--red); border-color: var(--red); }
.button-light:hover { background: var(--blush); border-color: var(--wine); color: var(--wine); }
.button-text { padding: 0; background: none; border: 0; color: var(--red); justify-content: space-between; width: 100%; border-top: 1px solid var(--line); border-radius: 0; padding-top: 14px; }
.button-text:hover { color: var(--wine); background: transparent; border-color: var(--line); }
/* 内容组件 */
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pain-card { background: #fff; border: 1px solid var(--line); border-top: 2px solid var(--red); padding: 32px; }
.pain-card .number { display: block; margin-bottom: 28px; }
.pain-card p { font-size: 18px; line-height: 1.8; }
.systems-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.system-card { border: 1px solid var(--line); background: #fff; display: flex; flex-direction: column; min-width: 0; }
.system-image { display: block; height: 230px; overflow: hidden; }
.system-image img { transition: transform .5s; }
.system-image:hover img { transform: scale(1.025); }
.system-content { padding: 28px; display: flex; flex-direction: column; flex: 1; }
.system-content .eyebrow { margin-bottom: 12px; }
.system-content h3 { margin-bottom: 18px; }
.system-content p { color: var(--muted); font-size: 16px; margin-bottom: 26px; }
.system-content .button { margin-top: auto; }
.feature-split { display: grid; grid-template-columns: 1fr 1fr; gap: 88px; align-items: center; }
.feature-split p { color: var(--muted); margin-bottom: 30px; }
.feature-image { height: 350px; border-radius: 3px; overflow: hidden; }
.process-teaser { display: grid; grid-template-columns: 1fr 1fr; gap: 88px; align-items: center; }
.heading-link { display: flex; justify-content: space-between; align-items: center; gap: 20px; min-height: 52px; }
.heading-link span { font-size: 34px; color: var(--red); }
.heading-link:hover { color: var(--red); }
.process-teaser p { color: var(--muted); }
.pain-section h2 { font-size: clamp(34px, 2.9vw, 42px); }
.pain-section .section-heading { margin-bottom: 28px; }
.statement { font-size: clamp(26px, 2.25vw, 32px); font-weight: 600; line-height: 1.6; text-wrap: balance; margin: 0 0 38px; padding-left: 24px; border-left: 3px solid var(--red); max-width: 32em; letter-spacing: -.025em; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { padding: 32px; border: 1px solid var(--line); background: #fff; min-width: 0; }
.card h3 { margin: 26px 0 16px; }
.card h3:empty { display: none; }
.card p { color: var(--muted); font-size: 16px; }
.card .number { display: block; }
.pain-cards { grid-template-columns: repeat(6, 1fr); }
.pain-cards .card { grid-column: span 2; }
.pain-cards .card:nth-child(4), .pain-cards .card:nth-child(5) { grid-column: span 3; }
.four { grid-template-columns: repeat(4, 1fr); }
.line-icon { width: 32px; height: 32px; color: var(--red); display: block; }
.benefits .card { background: #fff; border-color: var(--rose); padding: 30px; }
.benefits .card h3 { color: var(--ink); }
.benefits .card p { color: var(--muted); margin-top: 24px; }
.benefits .line-icon { color: var(--red); }
.ai-business-panel { padding: 32px 40px; background: #fff; border: 1px solid var(--rose); border-radius: 4px; }
.ai-business-row { display: grid; grid-template-columns: 1fr 64px 1fr; align-items: center; gap: 24px; padding: 24px 0; font-size: 24px; }
.ai-business-row + .ai-business-row { border-top: 1px solid var(--rose); }
.ai-scene { color: var(--muted); }
.ai-business-arrow { color: var(--red); text-align: center; }
.ai-result { font-weight: 650; }
.ai-business-emphasis { border-top: 1px solid var(--rose); margin-top: 12px; padding-top: 28px; }
.ai-business-emphasis p { max-width: none; font-size: 19px; }
.ai-business-emphasis p + p { margin-top: 12px; color: var(--red); }
.module-grid .card { background: var(--warm); border: 0; padding: 34px; }
.module-grid .card .number { font-size: 32px; font-weight: 400; }
.editorial-modules { display: grid; gap: 64px; }
.editorial-module { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 64px; }
.editorial-module figure { height: 370px; border-radius: 4px; overflow: hidden; }
.editorial-module:nth-child(even) figure { order: 2; }
.editorial-module h3 { font-size: 28px; margin: 16px 0 22px; }
.editorial-module p { color: var(--muted); }
.editorial-module .number { font-size: 30px; }
.business-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.business-grid article { padding: 28px; background: #fff; border-left: 2px solid var(--red); }
.cta { background: linear-gradient(115deg, var(--red), var(--wine)); color: #fff; }
.cta-inner { display: grid; grid-template-columns: minmax(0, 1fr) 280px; align-items: center; gap: 48px; }
.cta .eyebrow { color: #fff; }
.cta-copy { font-size: clamp(28px, 2.4vw, 34px); font-weight: 600; line-height: 1.6; text-wrap: balance; max-width: none; letter-spacing: -.025em; }
.cta-subcopy { margin-top: 22px; color: #fff; font-size: 20px; line-height: 1.8; }
.cta-subcopy p { max-width: none; text-wrap: balance; }
.cta-subcopy p + p { margin-top: 8px; }
.cta .actions { margin-top: 0; flex-direction: column; align-items: stretch; }
.cta .button { justify-content: space-between; }
.cta .button { background: transparent; color: #fff; border-color: #fff; }
.cta .button:hover { background: rgba(255,255,255,.12); }
.cta .button:first-child { background: #fff; color: var(--red); border-color: #fff; }
.cta .button:first-child:hover { background: var(--blush); color: var(--wine); border-color: var(--blush); }
.cta-tail { color: #fff; margin-top: 20px; }
/* 公司 */
.company-hero { background: var(--warm); padding-top: 76px; }
.company-introduction .section-heading { margin-bottom: 30px; }
.company-introduction h2 { font-size: 26px; }
.company-lead { font-size: 32px; line-height: 1.7; margin: 0 0 72px; max-width: 32em; font-weight: 550; text-wrap: balance; }
.company-stories { display: grid; gap: 72px; }
.company-story { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 80px; }
.company-story-copy { font-size: 18px; line-height: 1.9; color: var(--muted); }
.company-story figure { height: 360px; overflow: hidden; border-radius: 4px; }
.company-story:nth-child(even) figure { order: -1; }
.advantage-row { display: grid; grid-template-columns: 116px 1fr; gap: 32px; border-top: 1px solid var(--line); padding: 42px 0; }
.advantage-row:last-child { padding-bottom: 0; }
.advantage-row .number { font-size: 48px; line-height: 1.2; font-weight: 400; }
.advantage-row h3 { font-size: 27px; margin-bottom: 18px; }
.advantage-row p { max-width: 46em; color: var(--muted); }
/* 流程 */
.timeline { margin: 0 auto; padding: 0; list-style: none; max-width: 980px; }
.step { display: grid; grid-template-columns: 82px 1fr; gap: 42px; position: relative; padding-bottom: 46px; }
.step:last-child { padding-bottom: 0; }
.step:not(:last-child)::before { content: ""; width: 1px; background: #d4c6bd; position: absolute; top: 68px; bottom: 0; left: 32px; }
.step-index { display: grid; place-items: center; width: 66px; height: 66px; border-radius: 50%; background: #fff; border: 1px solid #ddc5be; color: var(--red); font-size: 22px; position: relative; }
.step h2 { font-size: 27px; margin-bottom: 18px; letter-spacing: -.025em; }
.step-body { padding: 10px 0 0; }
.step-body > p { color: var(--muted); max-width: 42em; }
.step-body .deliverable { margin-top: 24px; background: #fff; border-left: 3px solid var(--red); padding: 16px 20px; color: var(--wine); font-size: 16px; max-width: none; }
/* 联系表单 */
.contact-hero { background: #fff; }
.contact-hero .hero-visual { height: 380px; }
.contact-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 88px; }
.start-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.start-card { background: #fff; border: 1px solid var(--line); padding: 22px; }
.start-card h3 { font-size: 21px; margin-bottom: 12px; color: var(--red); }
.start-card p { font-size: 16px; }
.contact-intro .start-emphasis { font-size: 21px; font-weight: 550; color: var(--ink); border-left: 3px solid var(--red); padding-left: 20px; margin-top: 24px; 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: 22px; margin-bottom: 18px; }
.text-list li::before { content: ""; position: absolute; left: 0; top: .8em; width: 5px; height: 5px; background: var(--red); }
.consultation-section { background: var(--warm); border-top: 1px solid var(--line); }
.form-layout { display: grid; grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.form-card { padding: 44px; background: #fff; border: 1px solid var(--line); border-radius: 6px; }
.form-card .section-heading { margin-bottom: 32px; }
.contact-sidebar { display: grid; gap: 24px; min-width: 0; }
.contact-ai-card { padding: 36px; background: var(--blush); color: var(--ink); border: 1px solid var(--rose); border-radius: 6px; }
.contact-ai-card .eyebrow { color: var(--red); font-size: 11px; }
.contact-ai-card .line-icon { width: 52px; height: 52px; color: var(--red); margin: 24px 0; }
.contact-ai-card h2 { font-size: 32px; margin-bottom: 20px; }
.contact-ai-card p { color: var(--muted); font-size: 17px; }
.contact-ai-card .button { margin-top: 32px; width: 100%; justify-content: space-between; }
.contact-cards { display: grid; gap: 0; padding: 8px 26px; background: #fff; border: 1px solid var(--line); border-radius: 6px; }
.contact-cards .contact-item { padding: 22px 0; display: grid; gap: 8px; }
.contact-cards .contact-item:not([hidden]) ~ .contact-item:not([hidden]) { border-top: 1px solid var(--line); }
.contact-cards .contact-item > span:first-child { color: var(--muted); font-size: 14px; }
[data-contact] { overflow-wrap: anywhere; min-width: 0; }
.contact-cards [data-contact] { font-size: 17px; font-weight: 550; }
form { min-width: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field { display: grid; gap: 10px; margin-bottom: 24px; min-width: 0; }
.field label, .system-choices legend { font-size: 16px; font-weight: 600; }
.field label > span, .system-choices legend > span { color: var(--red); }
.field input, .field textarea { width: 100%; min-width: 0; background: var(--warm); border: 1px solid #c9c1b9; border-radius: 3px; min-height: 52px; padding: 13px 14px; color: var(--ink); }
.field textarea { resize: vertical; line-height: 1.7; }
.field-error { color: var(--red); font-size: 14px; line-height: 1.6; }
.field-error:empty { display: none; }
[aria-invalid="true"] { border-color: var(--red) !important; }
.system-choices { margin: 0 0 24px; padding: 0; border: 0; min-width: 0; }
.system-choices legend { margin-bottom: 14px; padding: 0; }
.choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.choice-grid label { display: flex; align-items: center; padding: 10px 14px; border: 1px solid #c9c1b9; min-height: 50px; cursor: pointer; font-size: 16px; }
.choice-grid label:has(input:checked) { border-color: var(--red); background: var(--blush); color: var(--red); }
.choice-grid input { accent-color: var(--red); width: 18px; height: 18px; margin: 0 10px 0 0; flex-shrink: 0; }
.system-choices .field-error { display: block; margin-top: 10px; }
.form-feedback { margin-top: 20px; font-size: 16px; }
.form-feedback #form-help { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; }
.contact-slogan { background: var(--warm); text-align: center; }
.contact-slogan p { max-width: none; font-size: 20px; margin-top: 22px; color: var(--muted); }
/* 页脚 */
.site-footer { background: #fff; color: var(--ink); border-top: 2px solid var(--red); padding: 72px 0 24px; }
.footer-top { display: grid; grid-template-columns: 1.7fr 1fr; gap: 60px; }
.site-footer .brand { margin-bottom: 24px; }
.footer-slogan { font-size: 19px; color: var(--ink); }
.footer-brand p:not(.footer-slogan) { color: var(--muted); font-size: 15px; margin-top: 12px; }
.site-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; align-content: start; }
.site-footer nav a { font-size: 15px; color: var(--muted); min-height: 40px; display: flex; align-items: center; }
.site-footer nav a:hover { color: var(--red); text-decoration: underline; text-underline-offset: 5px; }
.footer-contact p { font-size: 14px; color: var(--muted); margin-bottom: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.footer-bottom { border-top: 1px solid var(--line); margin-top: 46px; padding-top: 22px; display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; letter-spacing: .06em; }
/* 咨询面板 */
.ai-float { position: fixed; z-index: 25; right: 28px; bottom: 28px; display: flex; align-items: center; gap: 10px; min-height: 54px; padding: 12px 22px; background: var(--red); color: #fff; border: 0; border-radius: 30px; box-shadow: 0 6px 24px rgba(158,0,24,.12); font-size: 16px; font-weight: 600; }
.ai-float:hover { background: var(--wine); }
.ai-float svg { width: 23px; height: 23px; }
.mobile-actions { display: none; }
#ai-panel { position: fixed; inset: auto 24px 24px auto; margin: 0; padding: 0; border: 1px solid var(--line); width: 410px; max-width: calc(100% - 32px); border-radius: 12px; background: #fff; 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: 22px; border-bottom: 1px solid var(--line); }
.ai-header .eyebrow { margin-bottom: 6px; font-size: 10px; }
.ai-header h2 { font-size: 23px; }
.icon-button { height: 48px; width: 48px; border-radius: 50%; border: 1px solid var(--line); background: #fff; color: var(--red); font-size: 28px; line-height: 1; }
.ai-messages { padding: 22px; height: 280px; overflow: auto; overscroll-behavior: contain; display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.message { margin: 0; padding: 12px 16px; font-size: 15px; line-height: 1.75; border-radius: 2px 12px 12px; background: var(--warm); max-width: 92%; flex-shrink: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user { background: var(--red); color: #fff; align-self: flex-end; border-radius: 12px 2px 12px 12px; }
.ai-contact-link { display: flex; align-items: center; justify-content: space-between; padding: 12px 22px; min-height: 48px; color: var(--red); font-size: 15px; border-top: 1px solid var(--line); }
#ai-form { padding: 16px; background: var(--warm); display: flex; align-items: center; gap: 10px; }
#ai-input { width: 100%; min-width: 0; resize: none; border: 1px solid #c9c1b9; background: #fff; border-radius: 4px; padding: 10px; font-size: 16px; color: var(--ink); }
#ai-send { padding: 12px 16px; flex-shrink: 0; }
/* JS 只为进入视口的元素添加动效，禁用 JS 时始终可见。 */
@keyframes fade-in { from { opacity: .2; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
.revealed { animation: fade-in .6s ease both; }
@media (max-width: 1100px) {
  .container { width: calc(100% - 72px); }
  .header-inner { height: 78px; width: calc(100% - 48px); }
  .menu-toggle { display: block; }
  #main-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; padding: 16px 36px 28px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(158,0,24,.07); max-height: calc(100dvh - 90px); overflow: auto; }
  #main-nav.is-open { display: flex; flex-direction: column; align-items: stretch; gap: 4px; }
  #main-nav a { font-size: 20px; min-height: 52px; }
  #main-nav a::after { right: auto; width: 30px; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .hero-grid { gap: 32px; }
  h1 { font-size: 48px; }
  .home-hero h1 { font-size: 42px; }
  .hero-visual { height: 440px; }
  .product-hero .hero-visual { height: 400px; }
  .hero-subtitle { font-size: 19px; }
  .feature-split, .process-teaser, .contact-intro { gap: 44px; }
  .card, .pain-card { padding: 24px; }
  .four { grid-template-columns: repeat(2, 1fr); }
  .system-content { padding: 22px; }
  .system-content h3 { font-size: 20px; }
  .system-image { height: 200px; }
  .cta-inner { gap: 32px; grid-template-columns: 1fr; }
  .cta .actions { flex-direction: row; }
  .form-layout { gap: 24px; }
  .form-card { padding: 28px; }
  .contact-ai-card { padding: 28px; }
  .editorial-module { gap: 40px; }
  .footer-top { gap: 36px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 86px; }
  body { font-size: 16px; padding-bottom: calc(72px + env(safe-area-inset-bottom)); }
  .container { width: calc(100% - 40px); }
  .header-inner { width: calc(100% - 40px); height: 72px; }
  .brand { font-size: 21px; gap: 9px; }
  .brand img { width: 38px; height: 38px; }
  .brand small { font-size: 8px; }
  #main-nav { padding-inline: 24px; }
  .section { padding: 40px 0; }
  h1, .home-hero h1 { font-size: clamp(32px, 8.7vw, 40px); line-height: 1.28; }
  h2 { font-size: 30px; }
  h3 { font-size: 22px; }
  .eyebrow { font-size: 11px; margin-bottom: 14px; }
  .section-heading { margin-bottom: 20px; }
  .hero { padding: 24px 0 30px; }
  .hero-grid { grid-template-columns: 1fr; gap: 22px; }
  .hero-copy .eyebrow { margin-bottom: 18px; }
  .home-hero h1 { margin-bottom: 18px; }
  .hero-subtitle { font-size: 18px; margin-top: 16px; line-height: 1.7; }
  .hero-description { margin-top: 16px; font-size: 16px; line-height: 1.8; }
  .hero-bottom { margin-top: 22px; font-size: 13px; gap: 8px; }
  .hero-bottom::before { width: 20px; }
  .hero-visual, .product-hero .hero-visual { height: 265px; border-radius: 4px 4px 32px 4px; }
  .product-hero h1 .title-line:first-child { font-size: .76em; }
  .actions { margin-top: 22px; gap: 10px; }
  .button { min-height: 50px; padding: 11px 15px; gap: 12px; font-size: 15px; }
  .home-hero .actions { display: grid; grid-template-columns: 1.3fr 1fr; }
  .home-hero .button { padding-inline: 10px; gap: 6px; }
  .home-hero .button span { font-size: 19px; }
  .pain-grid, .card-grid, .systems-grid, .business-grid { grid-template-columns: 1fr; gap: 10px; }
  .pain-cards .card, .pain-cards .card:nth-child(4), .pain-cards .card:nth-child(5) { grid-column: auto; }
  .pain-card { padding: 16px; display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: baseline; }
  .pain-card .number { margin: 0; font-size: 12px; }
  .pain-card p { font-size: 16px; line-height: 1.7; }
  .card { padding: 16px; }
  .card h3 { margin: 12px 0 10px; }
  .pain-cards .card { display: grid; grid-template-columns: 22px 1fr; gap: 6px 10px; align-items: baseline; }
  .pain-cards .card .number { font-size: 12px; }
  .pain-cards .card h3 { margin: 0; font-size: 20px; }
  .pain-cards .card p { grid-column: 2; line-height: 1.7; }
  .system-image { height: auto; aspect-ratio: 2 / 1; }
  .system-content { padding: 16px; }
  .system-content h3 { font-size: 24px; }
  .system-content h3 { margin-bottom: 12px; }
  .system-content p { margin-bottom: 14px; }
  .feature-split, .process-teaser, .contact-intro, .form-layout, .cta-inner { grid-template-columns: 1fr; gap: 22px; }
  .feature-image { height: 260px; }
  .pain-section h2 { font-size: 30px; }
  .pain-section .section-heading { margin-bottom: 18px; }
  .statement { font-size: 24px; margin-bottom: 20px; padding-left: 14px; }
  .section-intro { margin-top: 12px; }
  .benefits .card, .module-grid .card { padding: 18px; }
  .benefits .card p { margin-top: 10px; }
  .module-grid .card .number { font-size: 24px; }
  .business-grid article { padding: 18px; }
  .ai-business-panel { padding: 10px 18px 18px; }
  .ai-business-row { grid-template-columns: minmax(0, 1.15fr) 16px minmax(0, 1fr); gap: 8px; padding: 16px 0; font-size: 16px; line-height: 1.7; }
  .ai-business-emphasis { margin-top: 6px; padding-top: 18px; }
  .ai-business-emphasis p { font-size: 17px; }
  .editorial-modules { gap: 28px; }
  .editorial-module { grid-template-columns: 1fr; gap: 16px; }
  .editorial-module:nth-child(even) figure { order: 0; }
  .editorial-module figure { height: 240px; }
  .editorial-module h3 { font-size: 25px; margin: 10px 0 14px; }
  .cta-copy { font-size: 26px; line-height: 1.65; }
  .cta-subcopy { font-size: 18px; margin-top: 14px; }
  .cta .actions { flex-direction: column; gap: 10px; }
  .page-hero { padding: 28px 0 34px; }
  .page-hero .hero-description { font-size: 17px; margin-top: 16px; }
  .company-hero { padding-top: 28px; }
  .company-introduction h2 { font-size: 23px; }
  .company-introduction .section-heading { margin-bottom: 18px; }
  .company-lead { font-size: 23px; margin: 0 0 26px; }
  .company-stories { gap: 30px; }
  .company-story { grid-template-columns: 1fr; gap: 16px; }
  .company-story:nth-child(even) figure { order: 0; }
  .company-story-copy { font-size: 17px; line-height: 1.8; }
  .company-story figure { height: auto; aspect-ratio: 16 / 9; }
  .advantage-row { grid-template-columns: 44px 1fr; gap: 12px; padding: 20px 0; }
  .advantage-row .number { font-size: 32px; }
  .advantage-row h3 { font-size: 24px; }
  .advantage-row h3 { margin-bottom: 12px; }
  .step { grid-template-columns: 44px 1fr; gap: 12px; padding-bottom: 24px; }
  .step-index { width: 42px; height: 42px; font-size: 17px; }
  .step:not(:last-child)::before { left: 21px; top: 46px; }
  .step h2 { font-size: 23px; margin-bottom: 12px; }
  .step-body { padding-top: 5px; }
  .step-body .deliverable { padding: 10px; font-size: 15px; margin-top: 12px; }
  .contact-hero .hero-visual { height: 210px; }
  .contact-intro { gap: 28px; }
  .start-grid { gap: 10px; }
  .start-card { padding: 14px; }
  .start-card h3 { font-size: 20px; margin-bottom: 8px; }
  .contact-intro .start-emphasis { font-size: 19px; margin-top: 16px; padding-left: 14px; }
  .form-grid { grid-template-columns: 1fr; gap: 0; }
  .form-card { padding: 24px 18px; }
  .form-card .section-heading { margin-bottom: 24px; }
  .contact-ai-card { padding: 26px; }
  .contact-ai-card .line-icon { margin: 10px 0 18px; }
  .contact-ai-card h2 { font-size: 28px; margin-bottom: 14px; }
  .contact-ai-card .button { margin-top: 24px; }
  .contact-cards { padding: 4px 20px; }
  .contact-cards .contact-item { padding: 16px 0; }
  .field { gap: 8px; margin-bottom: 16px; }
  .system-choices { margin-bottom: 16px; }
  .choice-grid { gap: 8px; }
  .contact-slogan h2 { font-size: 27px; }
  .contact-slogan p { font-size: 17px; }
  .site-footer { padding: 34px 0 20px; }
  .footer-top { grid-template-columns: 1fr; gap: 22px; }
  .site-footer nav { grid-template-columns: 1fr 1fr; gap: 4px 12px; }
  .site-footer nav a { min-height: 48px; font-size: 15px; }
  .footer-contact p { margin-bottom: 12px; }
  .footer-bottom { margin-top: 28px; }
  .ai-float { display: none; }
  .mobile-actions { display: grid; grid-template-columns: 1fr 1.2fr; gap: 10px; position: fixed; bottom: 0; left: 0; right: 0; background: #fff; border-top: 1px solid var(--line); z-index: 25; padding: 10px 20px calc(10px + env(safe-area-inset-bottom)); }
  .mobile-actions > * { display: flex; align-items: center; justify-content: center; gap: 24px; min-height: 50px; font-size: 16px; font-weight: 600; border-radius: 3px; }
  .mobile-actions button { border: 1px solid var(--red); background: #fff; color: var(--red); }
  .mobile-actions a { background: var(--red); color: #fff; }
  #ai-panel { inset: auto 16px calc(84px + env(safe-area-inset-bottom)) 16px; width: auto; max-width: none; max-height: calc(100dvh - 110px); }
  .ai-header { padding: 16px; }
  .ai-messages { height: min(280px, 36dvh); padding: 16px; }
  #ai-form { padding: 12px; }
}
@media (max-width: 360px) {
  .container, .header-inner { width: calc(100% - 32px); }
  h1, .home-hero h1 { font-size: 30px; }
  .home-hero .actions { grid-template-columns: 1fr; }
}
@media (min-width: 761px) {
  .footer-top:has(> .footer-contact:not([hidden])) { grid-template-columns: 1.65fr 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; }
}

/* JavaScript 不可用时，导航与联系入口仍可直接访问。 */
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: 1100px) {
  html:not(.js-ready) .site-header { position: static; }
  html:not(.js-ready) .header-inner { height: auto; flex-wrap: wrap; padding-block: 18px; }
  html:not(.js-ready) .menu-toggle { display: none; }
  html:not(.js-ready) #main-nav { display: flex; position: static; width: 100%; flex-direction: column; align-items: stretch; padding: 0; gap: 4px; box-shadow: none; border: 0; max-height: none; }
}