/* Shared corporate site styles — September 2026 visual refresh. */
@font-face { font-family: "Yumeng Display"; src: url('/yumeng-display.ttf') format('truetype'); font-weight: 900; font-style: normal; font-display: swap; }
:root {
  color-scheme: dark;
  --page: #0b1424;
  --surface: #111f34;
  --text: #f4f7ff;
  --muted: #b9c9de;
  --accent: #a4ceff;
  --line: rgba(178, 205, 243, .19);
  --nav: rgba(8, 17, 31, .85);
  --input: #0e1a2d;
  --focus: #a9d4ff;
}
html[data-theme="light"] {
  color-scheme: light;
  --page: #f7f7fc;
  --surface: #efeff8;
  --text: #242138;
  --muted: #57566c;
  --accent: #6650b9;
  --line: rgba(86, 69, 137, .19);
  --nav: rgba(250, 250, 255, .94);
  --input: #fff;
  --focus: #6650b9;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 108px; }
body { margin: 0; background: var(--page); color: var(--text); font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif; font-size: 16px; line-height: 1.8; -webkit-font-smoothing: antialiased; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 650; line-height: 1.25; }
button, a, input, select, textarea, summary { outline-offset: 5px; }
:focus-visible { outline: 2px solid var(--focus); }
::selection { background: #a4ceff; color: #101b2e; }
[hidden] { display: none !important; }
.container { width: min(1380px, calc(100% - 120px)); margin-inline: auto; }
.icon { width: 22px; height: 22px; flex-shrink: 0; vertical-align: middle; }
.skip-link { position: fixed; z-index: 200; top: -100px; left: 20px; padding: 12px 20px; color: var(--text); background: var(--surface); }
.skip-link:focus { top: 12px; }
.site-nav { position: fixed; z-index: 30; inset: 0 0 auto; height: 86px; border-bottom: 1px solid var(--line); background: var(--nav); backdrop-filter: blur(18px); }
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: flex; align-items: center; width: 198px; flex-shrink: 0; }
.brand-logo { width: 100%; height: auto; }
.brand-logo-light { display: none; }
html[data-theme="light"] .brand-logo-light { display: block; }
html[data-theme="light"] .brand-logo-dark { display: none; }
.nav-links { display: flex; align-self: stretch; align-items: stretch; gap: 58px; margin-left: auto; margin-right: auto; }
.nav-link { position: relative; display: flex; align-items: center; min-height: 44px; color: var(--muted); font-size: 16px; font-weight: 500; }
.nav-link:hover, .nav-link.active { color: var(--accent); }
.nav-link.active::after { content: ""; position: absolute; height: 2px; background: var(--accent); bottom: 14px; left: 0; right: 0; }
.nav-actions { display: flex; gap: 10px; }
.icon-button { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--text); background: transparent; }
.icon-button:hover { background: var(--surface); }
.theme-moon, .menu-close { display: none; }
html[data-theme="light"] .theme-sun { display: none; }
html[data-theme="light"] .theme-moon { display: block; }
.menu-button { display: none; }
.hero { position: relative; isolation: isolate; overflow: hidden; height: clamp(650px, 49.2vw, 790px); color: #f6f8ff; background: #091323; }
.hero-image { position: absolute; z-index: -3; inset: 56px 0 0; width: 100%; height: calc(100% - 56px); object-fit: cover; object-position: center top; animation: city-breathe 22s ease-in-out infinite alternate; }
.hero-image-light { display: none; }
.hero::before { content: ""; position: absolute; z-index: -2; inset: 0; background: linear-gradient(90deg, rgba(5, 12, 23, .6), rgba(5, 12, 23, .2) 42%, transparent 66%); }
.hero::after { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(0deg, rgba(7, 17, 30, .3), transparent 30%); }
.hero-content { padding-top: clamp(188px, 14.4vw, 234px); }
.hero h1 { font-family: "Yumeng Display", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: clamp(84px, 7.9vw, 124px); font-weight: 900; letter-spacing: .005em; line-height: 1.1; }
.hero-position { margin-top: 24px; font-size: clamp(30px, 3.15vw, 48px); font-weight: 550; letter-spacing: .055em; line-height: 1.4; }
.hero-description { margin-top: 12px; color: #d4e0f0; font-size: clamp(19px, 1.8vw, 28px); font-weight: 350; letter-spacing: .035em; }
.hero-actions { display: flex; gap: 22px; margin-top: 30px; }
.button { display: inline-flex; min-height: 58px; align-items: center; justify-content: center; gap: 20px; padding: 12px 30px; border: 1px solid var(--line); border-radius: 3px; font-size: 18px; font-weight: 600; line-height: 1.4; transition: background .2s, transform .2s, border-color .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #0a1930; border-color: transparent; background: linear-gradient(110deg, #c0e5ff, #8caeff); }
.button-primary:hover { background: #c9e5ff; }
.button-secondary { color: inherit; background: transparent; border-color: #97aac1; }
.button-secondary:hover { background: rgba(161, 202, 255, .12); }
.hero-actions .button-primary { min-width: 252px; }
.hero-actions .button-secondary { min-width: 192px; }
.hero-base { position: absolute; bottom: 40px; left: 0; right: 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.hero-motto { display: flex; align-items: center; gap: 22px; font-size: 18px; letter-spacing: .25em; color: #c7e0ff; }
.hero-motto::before { content: none; }
.scroll-cue { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; border: 1px solid rgba(204, 223, 251, .35); border-radius: 50%; color: #e2edff; }
.scroll-cue .icon { animation: scroll-cue 2.5s ease-in-out infinite; }
.business { position: relative; isolation: isolate; overflow: hidden; padding: 42px 0 48px; background: #223856; border-block: 1px solid rgba(178, 205, 243, .24); }
.anchor-alias { position: absolute; top: 0; }
.business::before { content: ""; position: absolute; z-index: -1; inset: -20px; filter: blur(9px); background: linear-gradient(rgba(24, 44, 75, .78), rgba(23, 40, 66, .87)), url('/yumeng-city-2026.webp') center 68% / cover; }
.section-label { display: flex; align-items: center; gap: 22px; color: var(--accent); font-size: 12px; font-weight: 650; letter-spacing: .3em; line-height: 1.5; }
.section-label::after { content: ""; height: 1px; width: 48px; background: currentColor; opacity: .65; }
.business-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 35px; }
.business-heading h2 { font-size: 12px; letter-spacing: .25em; font-weight: 450; color: #c4daf8; }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.service { padding: 0 34px; border-left: 1px solid rgba(173, 206, 249, .3); }
.service:first-child { padding-left: 0; border-left: 0; }
.service:last-child { padding-right: 0; }
.service-title { display: flex; align-items: center; gap: 26px; }
.service-icon { width: 54px; height: 54px; stroke-width: 1.5; color: #a4ceff; }
.service h3 { font-size: clamp(22px, 1.9vw, 29px); font-weight: 650; }
.service-copy { margin: 14px 0 0 80px; color: #d4e4fa; font-size: 16px; line-height: 1.8; }
.service-link { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; margin: 10px 0 0 80px; color: #d9e9ff; font-size: 14px; }
.service-link:hover { color: #fff; }
.service-link .icon { width: 19px; transition: transform .2s; }
.service-link:hover .icon { transform: translateX(5px); }
.section { padding: 100px 0; }
.section-heading { margin-top: 22px; font-size: clamp(32px, 3.2vw, 48px); letter-spacing: -.025em; line-height: 1.4; }
.section-lead { color: var(--muted); font-size: 17px; line-height: 1.9; }
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; align-items: center; }
.about-copy { padding-top: 32px; }
.company-name { font-size: 18px; font-weight: 550; margin-bottom: 18px; }
.about-copy .section-lead { max-width: 590px; }
.about-tags { display: flex; flex-wrap: wrap; padding: 0; margin: 22px 0 0; gap: 12px 24px; list-style: none; color: var(--accent); font-size: 14px; }
.credentials { margin-top: 64px; padding-top: 38px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 1.6fr 1fr; gap: 55px; align-items: center; }
.credential-image { border: 1px solid var(--line); background: #fff; }
.credential-image img { width: 100%; height: auto; }
.credential-open { display: block; width: 100%; padding: 0; border: 0; background: transparent; color: var(--text); text-align: left; }
.credential-caption { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 13px 18px; background: var(--surface); font-size: 13px; color: var(--muted); }
.credential-caption span:last-child { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); }
.credential-caption .icon { width: 17px; height: 17px; }
.credential-copy h3 { font-size: 24px; margin-bottom: 14px; }
.credential-list { padding: 0; margin: 20px 0 0; list-style: none; }
.credential-list li { padding: 10px 0; border-bottom: 1px solid var(--line); display: flex; align-items: baseline; gap: 15px; font-size: 15px; }
.credential-list li span { color: var(--accent); font-size: 11px; letter-spacing: .08em; }
.cooperation { background: var(--surface); border-block: 1px solid var(--line); }
.cooperation-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.cooperation-heading .section-lead { max-width: 340px; font-size: 15px; }
.steps { list-style: none; padding: 0; margin: 50px 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 40px; }
.step-number { display: block; padding-bottom: 18px; color: var(--accent); font-size: 13px; letter-spacing: .1em; border-bottom: 1px solid var(--line); }
.steps h3 { margin-top: 22px; font-size: 21px; }
.steps p { margin-top: 12px; color: var(--muted); font-size: 15px; line-height: 1.8; }
.contact-strip { padding: 76px 0; }
.contact-strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.contact-strip h2 { margin: 16px 0 15px; font-size: clamp(28px, 3vw, 44px); }
.contact-strip .section-lead { font-size: 15px; }
.contact-strip .button { flex-shrink: 0; }
.page-footer { border-top: 1px solid var(--line); padding: 30px 0; color: var(--muted); font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 32px; }
.footer-links { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 24px; }
.footer-links a { display: inline-flex; min-height: 32px; align-items: center; }
.footer-links a:hover { color: var(--accent); }
.image-dialog { width: min(1500px, calc(100% - 40px)); max-height: calc(100dvh - 40px); padding: 22px; border: 1px solid var(--line); background: var(--surface); color: var(--text); }
.image-dialog::backdrop { background: rgba(3, 8, 20, .82); backdrop-filter: blur(6px); }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; gap: 25px; margin-bottom: 20px; }
.dialog-heading h2 { font-size: 20px; }
.image-dialog img { width: 100%; height: auto; background: #fff; }
.image-dialog p { margin-top: 12px; font-size: 13px; color: var(--muted); }
.image-dialog p a { text-decoration: underline; text-underline-offset: 4px; }
.contact-page { padding-top: 86px; }
.contact-hero { padding: 48px 0 36px; }
.breadcrumb { color: var(--muted); display: flex; gap: 14px; font-size: 13px; margin-bottom: 30px; }
.breadcrumb a { min-height: 30px; display: inline-flex; align-items: center; }
.contact-hero h1 { font-size: clamp(40px, 4.1vw, 60px); margin-top: 18px; }
.contact-hero .section-lead { margin-top: 18px; max-width: 620px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 70px; align-items: start; padding-bottom: 64px; }
.contact-information { padding-top: 10px; }
.phone-label { display: block; font-size: 13px; color: var(--muted); }
.phone-large { display: inline-flex; align-items: center; gap: 24px; font-size: clamp(26px, 2.8vw, 38px); letter-spacing: -.025em; font-weight: 600; min-height: 60px; color: var(--accent); }
.contact-list { display: grid; gap: 20px; margin-top: 28px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item > .icon { margin-top: 5px; color: var(--accent); width: 19px; height: 19px; }
.contact-item strong { display: block; font-size: 12px; font-weight: 450; color: var(--muted); }
.contact-item a, .contact-item span { display: inline-flex; align-items: center; min-height: 32px; font-size: 16px; }
.contact-item a:hover { text-decoration: underline; text-underline-offset: 5px; }
.wechat { display: flex; align-items: center; gap: 22px; margin-top: 32px; padding-top: 25px; border-top: 1px solid var(--line); }
.wechat img { width: 108px; height: 108px; object-fit: contain; background: #fff; padding: 4px; }
.wechat h2 { font-size: 17px; margin-bottom: 6px; }
.wechat p { font-size: 13px; color: var(--muted); }
.form-panel { padding: 32px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.form-panel h2 { font-size: 25px; margin-bottom: 10px; }
.form-intro { color: var(--muted); font-size: 14px; line-height: 1.8; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 25px; }
.field { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 14px; }
.optional { font-size: 12px; color: var(--muted); margin-left: 6px; }
input, select, textarea { width: 100%; padding: 11px 13px; border: 1px solid var(--line); border-radius: 3px; color: var(--text); background: var(--input); font-size: 16px; line-height: 1.5; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: .78; }
textarea { min-height: 125px; resize: vertical; }
.form-actions { margin-top: 22px; }
.form-actions .button { min-height: 52px; font-size: 16px; }
.form-note { margin-top: 12px; font-size: 12px; color: var(--muted); }
.form-status { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--accent); font-size: 14px; }
html[data-theme="light"] .hero { color: #28213f; background: #eaf0f9; }
html[data-theme="light"] .hero-image-dark { display: none; }
html[data-theme="light"] .hero-image-light { display: block; }
html[data-theme="light"] .hero::before { background: linear-gradient(90deg, rgba(247, 248, 255, .92), rgba(246, 247, 255, .75) 28%, rgba(246, 247, 255, .3) 48%, transparent 68%); }
html[data-theme="light"] .hero::after { background: linear-gradient(0deg, rgba(242, 244, 255, .75), transparent 26%); }
html[data-theme="light"] .hero-description { color: #51566f; font-weight: 400; }
html[data-theme="light"] .hero-motto { color: #403b60; font-weight: 500; }
html[data-theme="light"] .hero-actions .button-primary { background: #6650b9; color: #fff; }
html[data-theme="light"] .hero-actions .button-primary:hover { background: #5844a4; }
html[data-theme="light"] .hero-actions .button-secondary { border-color: rgba(75, 67, 111, .55); background: rgba(247, 248, 255, .45); }
html[data-theme="light"] .scroll-cue { color: #423a66; border-color: rgba(75, 67, 111, .4); background: rgba(247, 248, 255, .5); }
html[data-theme="light"] .business { background: #e8eaf6; }
html[data-theme="light"] .business::before { background-image: linear-gradient(rgba(239, 240, 251, .84), rgba(230, 231, 246, .9)), url('/yumeng-city-light-2026.webp'); }
html[data-theme="light"] .business-heading h2, html[data-theme="light"] .service-copy { color: #56566e; }
html[data-theme="light"] .service { border-color: var(--line); }
html[data-theme="light"] .service-link, html[data-theme="light"] .service-icon { color: #6650b9; }
html[data-theme="light"] .button-primary:not(.hero .button-primary) { background: #6650b9; color: #fff; }
@keyframes city-breathe { from { transform: scale(1); } to { transform: scale(1.025); } }
@keyframes scroll-cue { 0%, 100% { transform: translateY(-2px); } 50% { transform: translateY(3px); } }
@media (min-width: 1700px) { .hero-content { padding-top: 225px; } }
@media (min-width: 761px) and (max-width: 900px) { .service h3 { font-size: 20px; } .service-icon { width: 36px; height: 36px; } }
@media (max-width: 1100px) {
  .container { width: calc(100% - 72px); }
  .nav-links { gap: 32px; }
  .hero h1 { font-size: 84px; }
  .hero-position { font-size: 31px; }
  .hero-description { font-size: 20px; }
  .service { padding-inline: 23px; }
  .service-title { gap: 15px; }
  .service-icon { width: 40px; height: 40px; }
  .service h3 { font-size: 23px; }
  .service-copy, .service-link { margin-left: 0; }
  .about-intro { gap: 45px; }
  .credentials { gap: 35px; }
  .contact-grid { gap: 40px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 90px; }
  .container { width: calc(100% - 40px); }
  .site-nav { height: 72px; }
  .brand { width: 155px; }
  .nav-inner { gap: 15px; }
  .nav-actions { gap: 8px; }
  .menu-button { display: grid; }
  .nav-links { display: none; position: absolute; top: 71px; inset-inline: 0; margin: 0; padding: 14px 20px 22px; flex-direction: column; gap: 0; background: var(--surface); border-bottom: 1px solid var(--line); box-shadow: 0 18px 30px rgba(0, 0, 0, .15); }
  .nav-links.is-open { display: flex; }
  .nav-link { min-height: 52px; }
  .nav-link.active::after { bottom: 8px; right: auto; width: 30px; }
  .menu-button[aria-expanded="true"] .menu-open { display: none; }
  .menu-button[aria-expanded="true"] .menu-close { display: block; }
  .hero { height: 660px; }
  .hero-image { object-position: 71% center; }
  .hero::before { background: linear-gradient(180deg, rgba(5, 12, 23, .6), rgba(5, 12, 23, .72) 34%, rgba(5, 12, 23, .12) 76%), linear-gradient(90deg, rgba(5, 12, 23, .24), transparent); }
  html[data-theme="light"] .hero::before { background: linear-gradient(180deg, rgba(245, 248, 255, .72), rgba(245, 248, 255, .9) 36%, rgba(245, 248, 255, .1) 76%); }
  html[data-theme="light"] .hero::after { background: linear-gradient(0deg, rgba(242, 244, 255, .92), transparent 24%); }
  .hero-content { padding-top: 146px; }
  .hero h1 { font-size: clamp(56px, 15vw, 74px); letter-spacing: -.05em; }
  .hero-position { margin-top: 20px; font-size: clamp(22px, 5.65vw, 29px); letter-spacing: .025em; }
  .hero-description { max-width: 330px; margin-top: 12px; font-size: 16px; line-height: 1.8; }
  .hero-actions { gap: 12px; margin-top: 28px; }
  .hero-actions .button { min-width: 0; min-height: 50px; padding: 12px 15px; font-size: 14px; gap: 12px; }
  .hero-actions .button .icon { width: 18px; height: 18px; }
  .hero-base { bottom: 28px; gap: 10px; }
  .hero-motto { gap: 12px; font-size: 13px; letter-spacing: .12em; }
  .hero-motto::before { width: 24px; }
  .business { padding: 30px 0 20px; }
  .business-heading { margin-bottom: 10px; }
  .business-heading h2 { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .service-grid { grid-template-columns: 1fr; }
  .service, .service:first-child, .service:last-child { border-left: 0; padding: 24px 0; }
  .service + .service { border-top: 1px solid rgba(173, 206, 249, .23); }
  .service-title { gap: 22px; }
  .service-icon { width: 40px; height: 40px; }
  .service h3 { font-size: 24px; }
  .service-copy { margin-left: 62px; margin-top: 8px; font-size: 15px; }
  .service-link { margin-left: 62px; margin-top: 8px; font-size: 13px; }
  .section { padding: 60px 0; }
  .section-heading { font-size: 32px; margin-top: 18px; }
  .about-intro { grid-template-columns: 1fr; gap: 22px; }
  .about-copy { padding: 0; }
  .company-name { font-size: 16px; margin-bottom: 12px; }
  .section-lead { font-size: 15px; }
  .about-tags { font-size: 13px; gap: 8px 20px; margin-top: 18px; }
  .credentials { grid-template-columns: 1fr; gap: 25px; margin-top: 36px; padding-top: 30px; }
  .credential-copy { order: -1; }
  .credential-copy h3 { font-size: 23px; }
  .credential-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 15px; margin-top: 12px; }
  .credential-list li { font-size: 13px; gap: 8px; }
  .credential-list li span { font-size: 10px; }
  .credential-caption { padding: 10px; font-size: 11px; }
  .credential-caption span:last-child { gap: 5px; }
  .cooperation-heading { display: block; }
  .cooperation-heading .section-lead { margin-top: 18px; }
  .steps { grid-template-columns: 1fr 1fr; gap: 28px 24px; margin-top: 32px; }
  .step-number { padding-bottom: 12px; }
  .steps h3 { font-size: 19px; margin-top: 16px; }
  .steps p { font-size: 14px; margin-top: 10px; }
  .contact-strip { padding: 54px 0; }
  .contact-strip-inner { display: block; }
  .contact-strip h2 { font-size: 28px; }
  .contact-strip .button { margin-top: 24px; min-height: 52px; font-size: 16px; }
  .page-footer { padding: 24px 0; }
  .footer-links { gap: 3px 20px; }
  .image-dialog { width: calc(100% - 20px); max-height: calc(100dvh - 20px); padding: 14px; }
  .dialog-heading h2 { font-size: 17px; }
  .contact-page { padding-top: 72px; }
  .contact-hero { padding: 28px 0 20px; }
  .breadcrumb { margin-bottom: 20px; }
  .contact-hero h1 { font-size: 42px; margin-top: 12px; }
  .contact-hero .section-lead { font-size: 15px; margin-top: 16px; }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; padding-bottom: 45px; }
  .contact-information { padding-top: 0; }
  .phone-large { font-size: 31px; min-height: 56px; }
  .contact-list { margin-top: 20px; gap: 16px; }
  .contact-item a, .contact-item span { font-size: 15px; }
  .wechat { margin-top: 24px; padding-top: 20px; gap: 20px; }
  .wechat img { width: 86px; height: 86px; }
  .form-panel { padding: 24px 20px; }
  .form-panel h2 { font-size: 23px; }
  .form-grid { gap: 18px 14px; }
  .form-actions .button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}