:root {
  --blue: #17538d;
  --blue-dark: #0b3159;
  --blue-ink: #071e35;
  --orange: #ff7100;
  --text: #17202a;
  --muted: #64707c;
  --line: #dfe5ea;
  --surface: #f4f7f9;
  --white: #fff;
  --shell: min(1180px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--white); font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.7; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.narrow { max-width: 760px; }

.site-header { position: sticky; z-index: 50; top: 0; background: rgba(255,255,255,.97); border-bottom: 1px solid rgba(11,49,89,.09); backdrop-filter: blur(12px); }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { width: 238px; height: 54px; display: flex; align-items: center; flex: 0 0 auto; }
.brand-crop { width: 100%; display: flex; align-items: center; }
.brand-crop img { width: 100%; height: auto; }
.main-nav { display: flex; align-items: stretch; gap: 24px; font-size: 15px; white-space: nowrap; }
.main-nav a { position: relative; padding: 27px 0 24px; color: #2d3944; }
.main-nav a::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: 17px; height: 2px; background: var(--blue); transition: .2s ease; }
.main-nav a:hover::after, .main-nav a.active::after { left: 0; right: 0; }
.main-nav a.active { color: var(--blue); font-weight: 600; }
.menu-toggle { display: none; border: 1px solid var(--line); border-radius: 6px; background: #fff; padding: 8px 12px; }

.hero { min-height: 560px; display: grid; align-items: center; color: #fff; }
.hero-placeholder { position: relative; overflow: hidden; background: linear-gradient(115deg, #071928 0%, #0b3159 58%, #17538d 100%); }
.hero-placeholder::before { content: ""; position: absolute; width: 620px; height: 620px; border: 1px solid rgba(255,255,255,.12); border-radius: 50%; right: -60px; top: -250px; box-shadow: 0 0 0 90px rgba(255,255,255,.035), 0 0 0 180px rgba(255,255,255,.025); }
.hero-placeholder::after { content: "MH"; position: absolute; right: 8vw; bottom: -145px; font-weight: 900; font-size: clamp(250px, 31vw, 520px); line-height: 1; color: rgba(255,255,255,.035); }
.hero-content { position: relative; z-index: 1; padding-block: 86px; }
.eyebrow { margin: 0 0 14px; color: #9ed1ff; font-size: 14px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow.dark { color: var(--blue); }
.hero h1 { max-width: 720px; margin: 0; font-size: clamp(52px, 7vw, 96px); line-height: 1.05; letter-spacing: -.04em; }
.hero-content > p:not(.eyebrow) { max-width: 660px; margin: 24px 0 0; color: rgba(255,255,255,.78); font-size: 18px; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 4px; padding: 10px 22px; font-weight: 700; cursor: pointer; }
.button.primary { color: #fff; background: var(--orange); }
.button.ghost { color: #fff; border-color: rgba(255,255,255,.35); }
.banner-note { display: inline-block; margin-top: 54px; border-top: 1px solid rgba(255,255,255,.22); padding-top: 12px; color: rgba(255,255,255,.45); font-size: 13px; }

.section { padding: 88px 0; }
.section.muted { background: var(--surface); }
.two-column { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 86px; align-items: start; }
.section h1, .section h2 { margin: 0; color: var(--blue-ink); line-height: 1.2; }
.section h2 { font-size: clamp(34px, 4vw, 52px); letter-spacing: -.03em; }
.prose { color: #45515d; }
.prose p:first-child { margin-top: 0; }
.lead { font-size: 17px; }
.text-link { color: var(--blue); font-weight: 700; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.product-card { min-width: 0; overflow: hidden; border: 1px solid var(--line); background: #fff; transition: transform .2s ease, box-shadow .2s ease; }
.product-card:hover { transform: translateY(-3px); box-shadow: 0 18px 36px rgba(7,30,53,.09); }
.product-image { aspect-ratio: 4/3; display: grid; place-items: center; background: #fff; color: var(--blue); font-size: 42px; font-weight: 900; overflow: hidden; }
.product-image img { width: 100%; height: 100%; object-fit: contain; }
.product-body { padding: 18px 20px 22px; }
.product-body span { color: var(--blue); font-size: 13px; }
.product-body h3 { min-height: 3.2em; margin: 5px 0 0; font-size: 17px; line-height: 1.6; }
.empty-state { grid-column: 1 / -1; padding: 48px; text-align: center; color: var(--muted); border: 1px dashed #bdc9d2; background: #fff; }

.page-hero { min-height: 300px; display: grid; align-items: end; padding: 70px 0 54px; color: #fff; background: linear-gradient(120deg, var(--blue-ink), var(--blue)); }
.page-hero p { margin: 0 0 4px; color: #9ed1ff; font-size: 13px; font-weight: 700; letter-spacing: .18em; }
.page-hero h1 { margin: 0; font-size: clamp(44px, 6vw, 70px); line-height: 1.15; }
.image-hero { min-height: 300px; background-position: center; background-size: cover; }
.simple-hero { position: relative; overflow: hidden; }
.simple-hero::after { content: "MH"; position: absolute; right: 8vw; bottom: -58px; color: rgba(255,255,255,.05); font-size: 210px; font-weight: 900; line-height: 1; }
.products-hero { background: linear-gradient(105deg, #071e35 0%, #104879 67%, #2874ae 100%); }

.catalog-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 44px; align-items: start; }
.filter-panel { position: sticky; top: 104px; border-top: 4px solid var(--blue); background: var(--surface); padding: 22px 18px; }
.filter-panel h2 { margin: 0 0 14px; font-size: 21px; }
.filter-panel a { display: flex; justify-content: space-between; gap: 16px; border-top: 1px solid var(--line); padding: 10px 2px; color: #45515d; font-size: 14px; }
.filter-panel a span { color: #8a949d; }
.filter-panel a.active { color: var(--blue); font-weight: 700; }
.catalog-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
.catalog-heading h2 { font-size: 36px; }
.catalog-heading > span { color: var(--muted); font-size: 14px; }
.catalog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pagination { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 34px; }
.pagination a { min-width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); }
.pagination a.active { color: #fff; border-color: var(--blue); background: var(--blue); }

.back-link { display: inline-block; margin-bottom: 28px; color: var(--blue); font-weight: 700; }
.product-intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 64px; align-items: center; }
.detail-image { aspect-ratio: 4/3; display: grid; place-items: center; overflow: hidden; border: 1px solid var(--line); background: #fff; color: var(--blue); font-size: 80px; font-weight: 900; }
.detail-image img { width: 100%; height: 100%; object-fit: contain; }
.product-intro h1 { font-size: clamp(34px, 4vw, 52px); }
.brand-tag { display: inline-block; margin-top: 18px; border-left: 3px solid var(--orange); padding: 4px 10px; color: var(--blue); background: var(--surface); }
.detail-summary { margin: 24px 0 30px; color: #4c5863; font-size: 17px; }
.detail-content { max-width: 900px; margin: 76px auto 0; border-top: 1px solid var(--line); padding-top: 40px; }
.detail-content h2 { font-size: 30px; }
.rich-text { color: #3f4b56; }
.rich-text h1, .rich-text h2, .rich-text h3 { color: var(--blue-ink); line-height: 1.35; }
.rich-text h2 { margin-top: 42px; font-size: 26px; }
.rich-text h3 { margin-top: 28px; font-size: 20px; }
.rich-text img { height: auto; margin: 26px auto; }
.rich-text table { width: 100%; border-collapse: collapse; }
.rich-text td, .rich-text th { border: 1px solid var(--line); padding: 10px; }

.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.service-card { min-height: 280px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 34px; }
.service-card > span, .application-card > span { color: var(--orange); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
.service-card h2 { margin-top: 34px; font-size: 24px; }
.service-card p { color: var(--muted); }
.service-card a { color: var(--blue); font-weight: 700; }
.stats-band { color: #fff; background: var(--blue-ink); }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.stats-grid > div { display: flex; flex-direction: column; align-items: center; border-right: 1px solid rgba(255,255,255,.15); }
.stats-grid > div:last-child { border-right: 0; }
.stats-grid strong { font-size: 52px; }
.stats-grid span { color: rgba(255,255,255,.62); }
.application-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.application-card { min-height: 220px; padding: 28px; color: #fff; background: linear-gradient(145deg, #0b3159, #17538d); }
.application-card:nth-child(even) { background: linear-gradient(145deg, #172b3d, #2f4a60); }
.application-card h3 { margin: 40px 0 10px; font-size: 24px; }
.application-card p { margin: 0; color: rgba(255,255,255,.7); }
.article-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 68px; align-items: start; }
.article-layout aside { position: sticky; top: 106px; }
.article-layout aside img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.article-layout aside p { margin: 12px 0 0; color: var(--muted); font-size: 13px; }
.news-copy h1 { margin: 0 0 30px; font-size: clamp(34px, 4vw, 50px); }
.job-card { display: grid; grid-template-columns: .75fr 1.25fr; gap: 70px; border-left: 5px solid var(--blue); background: #fff; padding: 48px; }
.job-card h2 { margin-bottom: 16px; }
.job-card h3 { color: var(--blue-ink); font-size: 20px; }
.job-card li { margin-bottom: 10px; color: #45515d; }
.contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; align-items: start; }
.contact-info h2, .message-panel h2 { margin-bottom: 30px; font-size: 34px; }
.contact-info dl { margin: 0; }
.contact-info dl > div { display: grid; grid-template-columns: 70px 1fr; gap: 14px; border-top: 1px solid var(--line); padding: 12px 0; }
.contact-info dt { color: var(--muted); }
.contact-info dd { margin: 0; }
.map-link { display: inline-block; margin-top: 20px; color: var(--blue); font-weight: 700; }
.wechat-card { display: flex; align-items: center; gap: 18px; margin-top: 34px; }
.wechat-card img { width: 112px; height: 112px; object-fit: contain; border: 1px solid var(--line); }
.wechat-card p { margin: 2px 0 0; color: var(--muted); }
.message-panel { border: 1px solid var(--line); padding: 38px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.form-grid label { display: flex; flex-direction: column; gap: 7px; color: #34414c; font-weight: 600; }
.form-grid label span { color: #c44230; }
.form-grid input, .form-grid textarea, .form-grid select { width: 100%; border: 1px solid #cbd3d9; border-radius: 3px; background: #fff; padding: 11px 12px; color: var(--text); }
.form-grid textarea { resize: vertical; }
.form-grid input:focus, .form-grid textarea:focus { outline: 2px solid rgba(23,83,141,.18); border-color: var(--blue); }
.form-grid .full { grid-column: 1 / -1; }
.honeypot { position: absolute !important; left: -9999px; }
.notice { margin: 0 0 20px; border: 1px solid; padding: 12px 14px; }
.notice.success { color: #25633b; border-color: #abd3b8; background: #eff9f2; }
.notice.error { color: #8a2d23; border-color: #e4b0a9; background: #fff4f2; }

.admin-body { min-height: 100vh; background: #f3f6f8; }
.admin-header { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 0 32px; color: #fff; background: var(--blue-ink); }
.admin-logo { font-size: 20px; font-weight: 800; }
.admin-logo span { color: #8ebbe1; font-size: 13px; font-weight: 500; }
.admin-header nav { display: flex; align-items: center; gap: 24px; font-size: 14px; }
.admin-header form { margin: 0; }
.admin-header button { border: 0; color: #fff; background: transparent; cursor: pointer; }
.admin-main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 48px 0 80px; }
.admin-page-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
.admin-page-heading p { margin: 0; color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: .15em; }
.admin-page-heading h1 { margin: 3px 0 0; font-size: 36px; }
.button.secondary { color: var(--blue); border-color: #aebdca; background: #fff; }
.stat-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stat-cards a { display: flex; flex-direction: column; border-top: 4px solid var(--blue); background: #fff; padding: 28px; box-shadow: 0 8px 24px rgba(7,30,53,.05); }
.stat-cards strong { color: var(--blue-ink); font-size: 42px; line-height: 1.2; }
.stat-cards span { color: var(--muted); }
.admin-shortcuts { margin-top: 34px; background: #fff; padding: 28px; }
.admin-shortcuts h2 { margin-top: 0; }
.admin-shortcuts .button { margin-right: 10px; }
.admin-table-wrap { overflow: auto; background: #fff; box-shadow: 0 8px 24px rgba(7,30,53,.05); }
.admin-table { width: 100%; min-width: 780px; border-collapse: collapse; }
.admin-table th, .admin-table td { border-bottom: 1px solid var(--line); padding: 14px 16px; text-align: left; vertical-align: middle; }
.admin-table th { color: #54616c; background: #f9fafb; font-size: 13px; }
.table-product { display: flex; align-items: center; gap: 13px; max-width: 440px; }
.table-product > div { width: 62px; height: 48px; flex: 0 0 auto; display: grid; place-items: center; overflow: hidden; color: var(--blue); background: var(--surface); font-weight: 800; }
.table-product img { width: 100%; height: 100%; object-fit: contain; }
.table-product strong { font-size: 14px; }
.status { display: inline-block; border-radius: 999px; padding: 3px 9px; font-size: 12px; }
.status.online { color: #23663a; background: #e8f6ec; }
.status.offline { color: #6d7378; background: #eceff1; }
.table-actions { display: flex; align-items: center; gap: 11px; white-space: nowrap; }
.table-actions form { margin: 0; }
.table-actions a, .table-actions button { border: 0; padding: 0; color: var(--blue); background: transparent; font-size: 13px; cursor: pointer; }
.table-actions .danger { color: #b53c2f; }
.admin-form { background: #fff; padding: 32px; box-shadow: 0 8px 24px rgba(7,30,53,.05); }
.admin-form small { color: var(--muted); font-weight: 400; }
.checkbox-label { align-self: end; flex-direction: row !important; align-items: center; padding-bottom: 12px; }
.checkbox-label input { width: auto; }
.existing-images h3 { margin: 0 0 12px; }
.existing-images > div { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.existing-images label { overflow: hidden; border: 1px solid var(--line); padding: 8px; }
.existing-images img { width: 100%; aspect-ratio: 4/3; object-fit: contain; }
.existing-images label span { color: #b53c2f; font-size: 13px; }
.message-list { display: grid; gap: 16px; }
.message-list article { background: #fff; padding: 24px; box-shadow: 0 6px 18px rgba(7,30,53,.05); }
.message-meta { display: flex; align-items: start; justify-content: space-between; gap: 20px; }
.message-meta strong, .message-meta span { display: block; }
.message-meta span, .message-meta time, .message-list small { color: var(--muted); font-size: 13px; }
.message-list article > p { white-space: pre-wrap; }
.danger-link { margin-top: 14px; border: 0; padding: 0; color: #b53c2f; background: transparent; cursor: pointer; }
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 28px; background: linear-gradient(145deg, #071e35, #17538d); }
.login-card { width: min(420px, 100%); display: flex; flex-direction: column; gap: 16px; background: #fff; padding: 42px; box-shadow: 0 24px 60px rgba(0,0,0,.2); }
.login-mark { width: 56px; height: 56px; display: grid; place-items: center; border-radius: 12px; color: #fff; background: var(--orange); font-weight: 900; }
.login-card h1 { margin: 0; }
.login-card > p { margin: -10px 0 4px; color: var(--muted); }
.login-card label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; }
.login-card input { border: 1px solid #cbd3d9; padding: 11px 12px; }
.login-card > a { color: var(--blue); text-align: center; font-size: 14px; }

.site-footer { color: rgba(255,255,255,.74); background: #081c2e; }
.footer-grid { display: grid; grid-template-columns: 1fr 1.25fr 110px; gap: 56px; align-items: center; padding-block: 54px; }
.footer-brand { color: #fff; font-size: 21px; font-weight: 700; }
.site-footer p { margin: 8px 0 0; }
.site-footer strong { color: #fff; }
.qr-link img { width: 104px; height: 104px; object-fit: contain; border: 5px solid #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 16px 20px; text-align: center; font-size: 13px; color: rgba(255,255,255,.45); }

@media (max-width: 1080px) {
  .main-nav { gap: 14px; font-size: 14px; }
  .brand { width: 200px; }
}

@media (max-width: 860px) {
  :root { --shell: min(100% - 28px, 680px); }
  .header-inner { min-height: 68px; }
  .brand { width: 190px; height: 50px; }
  .menu-toggle { display: block; }
  .main-nav { position: absolute; display: none; left: 0; right: 0; top: 68px; flex-direction: column; gap: 0; padding: 10px 20px 20px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 16px 28px rgba(7,30,53,.08); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 4px; }
  .main-nav a::after { display: none; }
  .hero { min-height: 540px; }
  .two-column { grid-template-columns: 1fr; gap: 30px; }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 110px; gap: 30px; }
  .footer-grid > div:nth-child(2) { grid-column: 1 / -1; grid-row: 2; }
  .catalog-layout { grid-template-columns: 1fr; }
  .filter-panel { position: static; display: flex; overflow-x: auto; gap: 8px; border-top-width: 3px; padding: 14px; }
  .filter-panel h2 { display: none; }
  .filter-panel a { flex: 0 0 auto; border: 1px solid var(--line); padding: 7px 10px; background: #fff; }
  .filter-panel a span { margin-left: 6px; }
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-intro, .contact-grid, .article-layout, .job-card { grid-template-columns: 1fr; gap: 38px; }
  .article-layout aside { position: static; max-width: 480px; }
  .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .application-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .admin-header { align-items: flex-start; flex-direction: column; padding: 18px 22px; }
  .admin-header nav { width: 100%; flex-wrap: wrap; gap: 14px 20px; }
  .stat-cards { grid-template-columns: 1fr; }
  .existing-images > div { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 540px) {
  .hero { min-height: 500px; }
  .hero h1 { font-size: 52px; }
  .hero-content > p:not(.eyebrow) { font-size: 16px; }
  .section { padding: 64px 0; }
  .section-heading { align-items: start; flex-direction: column; }
  .product-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .qr-link { width: 110px; }
  .page-hero { min-height: 240px; padding-bottom: 40px; }
  .catalog-heading { align-items: start; flex-direction: column; }
  .catalog-grid, .service-grid, .application-grid, .stats-grid { grid-template-columns: 1fr; }
  .stats-grid > div { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.15); padding: 24px 0; }
  .stats-grid > div:last-child { border-bottom: 0; }
  .product-intro { gap: 26px; }
  .message-panel, .job-card, .admin-form, .login-card { padding: 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid label, .form-grid .full { grid-column: 1; }
  .existing-images > div { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .message-meta { flex-direction: column; gap: 8px; }
}