:root {
  --ink: #102939;
  --ink-soft: #294554;
  --teal: #087F73;
  --teal-dark: #06685E;
  --lime: #D7F36A;
  --paper: #F5F8F7;
  --white: #FFFFFF;
  --line: #D9E6E2;
  --muted: #48606B;
  --price: #A7430A;
  --shadow: 0 16px 40px rgba(16, 41, 57, .09);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif; line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid #B3470D; outline-offset: 3px; }
.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.section { padding-block: 96px; }
.eyebrow { margin: 0 0 15px; color: var(--teal-dark); font-size: 13px; font-weight: 900; letter-spacing: .12em; }
.section-head h2, .process-intro h2, .selection-heading h2, .faq-heading h2 { margin: 0; color: var(--ink); font-size: clamp(31px, 3.5vw, 46px); line-height: 1.23; letter-spacing: -.025em; }
.section-head p:last-child, .selection-heading > p:last-child, .faq-heading > p:nth-of-type(2) { margin: 19px 0 0; color: var(--muted); font-size: 16px; }

.site-header { position: relative; z-index: 20; background: var(--white); border-bottom: 1px solid var(--line); }
.header-line { color: #D4E8E6; background: var(--ink); font-size: 12px; font-weight: 700; }
.header-line-inner { min-height: 32px; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.header-main { min-height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: block; width: min(344px, 48vw); flex: 0 1 344px; }
.brand img { width: 100%; height: auto; }
.site-menu { display: flex; align-items: center; gap: 32px; color: var(--ink); font-size: 15px; font-weight: 800; }
.site-menu > a:not(.nav-action) { min-height: 44px; display: inline-flex; align-items: center; border-bottom: 2px solid transparent; transition: border-color .2s ease, color .2s ease; }
.site-menu > a:not(.nav-action):hover { color: var(--teal-dark); border-color: var(--teal); }
.nav-action { min-height: 46px; display: inline-flex; align-items: center; gap: 14px; padding: 0 18px; color: var(--white); background: var(--teal-dark); border-radius: 8px; }
.nav-action:hover { background: var(--ink); }
.menu-toggle { display: none; width: 48px; min-height: 46px; padding: 11px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--ink); }

.hero { position: relative; overflow: hidden; color: var(--white); background: var(--ink); }
.hero::before { position: absolute; inset: 0; content: ""; pointer-events: none; background: radial-gradient(circle at 8% 12%, rgba(8,127,115,.28), transparent 34%), linear-gradient(90deg, transparent 97%, rgba(255,255,255,.045) 97%), linear-gradient(transparent 97%, rgba(255,255,255,.045) 97%); background-size: auto, 38px 38px, 38px 38px; }
.hero::after { position: absolute; right: -160px; bottom: -320px; width: 600px; height: 600px; border: 1px solid rgba(215,243,106,.22); border-radius: 50%; content: ""; pointer-events: none; }
.hero-layout { position: relative; z-index: 1; min-height: 635px; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(340px, .9fr); align-items: center; gap: 72px; padding-block: 78px 88px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 12px; margin: 0 0 24px; color: var(--lime); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.signal-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 5px rgba(215,243,106,.16); }
.hero h1 { margin: 0; font-size: clamp(39px, 4.4vw, 62px); line-height: 1.18; letter-spacing: -.035em; }
.hero h1 em { color: var(--lime); font-style: normal; }
.hero-lead { max-width: 630px; margin: 26px 0 0; color: #E0ECEB; font-size: 18px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 35px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 22px; padding: 0 24px; border: 1px solid transparent; border-radius: 8px; font-weight: 900; transition: transform .2s ease, background-color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-bright { color: var(--ink); background: var(--lime); }
.button-bright:hover { background: #E4F8A1; }
.button-ghost { color: var(--white); border-color: rgba(255,255,255,.45); background: rgba(255,255,255,.03); }
.button-dark { color: var(--white); background: var(--ink); }
.button-dark:hover { background: var(--teal-dark); }
.hero-footnote { margin: 19px 0 0; color: #C3D8D6; font-size: 13px; }
.efficiency-panel { overflow: hidden; color: var(--ink); background: #F9FCF9; border: 1px solid rgba(255,255,255,.45); border-radius: 18px; box-shadow: 0 32px 70px rgba(0,0,0,.22); }
.panel-top { min-height: 58px; display: flex; align-items: center; justify-content: space-between; padding-inline: 30px; color: var(--teal-dark); border-bottom: 1px solid var(--line); font-size: 12px; font-weight: 900; letter-spacing: .13em; }
.panel-corner { width: 29px; height: 29px; display: grid; place-items: center; color: var(--ink); background: var(--lime); border-radius: 5px; font-size: 18px; }
.panel-focus { padding: 35px 30px 25px; }
.panel-focus > span { display: block; margin-bottom: 8px; color: var(--teal-dark); font-size: 13px; font-weight: 900; }
.panel-focus strong { display: block; font-size: 27px; line-height: 1.35; }
.panel-focus p { margin: 9px 0 0; color: var(--muted); }
.panel-steps { margin: 0; padding: 0 30px 28px; list-style: none; }
.panel-steps li { display: grid; grid-template-columns: 40px 1fr; gap: 16px; align-items: center; padding: 14px 0; border-top: 1px solid var(--line); }
.panel-steps li > span { width: 38px; height: 38px; display: grid; place-items: center; color: var(--teal-dark); background: #E7F3EF; border-radius: 7px; font-size: 13px; font-weight: 900; }
.panel-steps strong, .panel-steps small { display: block; }
.panel-steps strong { font-size: 16px; }
.panel-steps small { margin-top: 1px; color: var(--muted); font-size: 13px; }
.panel-bottom { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 15px 30px; color: var(--ink); background: var(--lime); font-size: 13px; font-weight: 900; }
.panel-bottom span { color: var(--teal-dark); }

.products-section { background: var(--paper); }
.product-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; }
.product-head > div { max-width: 730px; }
.head-link { min-height: 44px; display: inline-flex; align-items: center; gap: 13px; color: var(--teal-dark); font-weight: 900; white-space: nowrap; }
.head-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.catalog-note { display: flex; align-items: center; gap: 12px; margin: 30px 0 25px; padding: 13px 18px; color: var(--ink-soft); background: #E8F2EE; border-left: 3px solid var(--teal); border-radius: 0 8px 8px 0; font-size: 14px; }
.catalog-note > span { width: 22px; height: 22px; flex: 0 0 auto; display: grid; place-items: center; color: var(--white); background: var(--teal-dark); border-radius: 50%; font-family: Georgia, serif; font-size: 13px; font-weight: 900; }
.catalog-note p { margin: 0; }
.product-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.product-card { min-width: 0; display: flex; flex-direction: column; overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 7px 25px rgba(16,41,57,.04); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.product-card:hover { transform: translateY(-4px); border-color: #8FC3B6; box-shadow: var(--shadow); }
.product-visual { position: relative; min-width: 0; aspect-ratio: 1 / .9; display: grid; place-items: center; padding: 20px; background: var(--white); border-bottom: 1px solid #E9F0EE; }
.product-visual img { width: 100%; height: 100%; object-fit: contain; }
.product-index { position: absolute; top: 14px; left: 14px; z-index: 1; min-width: 31px; height: 28px; display: grid; place-items: center; color: var(--ink); background: var(--lime); border-radius: 5px; font-size: 12px; font-weight: 900; }
.product-content { display: flex; flex: 1; flex-direction: column; padding: 17px 19px 20px; }
.product-category { color: var(--teal-dark); font-size: 12px; font-weight: 900; }
.product-content h3 { margin: 5px 0 16px; color: var(--ink); font-size: 18px; line-height: 1.4; }
.product-content strong { margin-top: auto; color: var(--price); font-size: 20px; line-height: 1.3; }
.catalog-tail { display: flex; align-items: center; justify-content: space-between; gap: 22px; margin-top: 27px; padding: 20px 0 0; border-top: 1px solid var(--line); }
.catalog-tail p { margin: 0; color: var(--muted); }

.scenarios-section { background: var(--white); }
.scenario-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 42px; }
.scenario-grid article { min-width: 0; min-height: 235px; padding: 27px 23px; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; }
.scenario-grid article > span { color: var(--teal-dark); font-family: Arial, sans-serif; font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.scenario-grid h3 { margin: 40px 0 8px; color: var(--ink); font-size: 22px; }
.scenario-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.process-section { color: var(--white); background: var(--ink); }
.process-layout { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 92px; align-items: center; }
.eyebrow-light { color: var(--lime); }
.process-intro h2 { color: var(--white); }
.process-intro > p:nth-of-type(2) { margin: 20px 0 30px; color: #D3E3E1; }
.process-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.22); }
.process-steps li { display: grid; grid-template-columns: 50px 1fr; gap: 20px; align-items: start; padding: 22px 0; border-bottom: 1px solid rgba(255,255,255,.22); }
.process-steps li > span { color: var(--lime); font-family: Arial, sans-serif; font-size: 20px; font-weight: 900; }
.process-steps h3 { margin: 0 0 5px; font-size: 19px; }
.process-steps p { margin: 0; color: #D3E3E1; font-size: 14px; }

.selection-section { background: var(--paper); }
.selection-layout { display: grid; grid-template-columns: minmax(0, .68fr) minmax(0, 1.32fr); gap: 80px; align-items: start; }
.selection-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.selection-grid article { min-height: 186px; padding: 23px; background: var(--white); border: 1px solid var(--line); border-radius: 10px; }
.selection-grid span { color: var(--teal-dark); font-family: Arial, sans-serif; font-size: 14px; font-weight: 900; }
.selection-grid h3 { margin: 20px 0 7px; font-size: 19px; }
.selection-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.faq-section { background: var(--white); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 80px; }
.faq-heading .head-link { margin-top: 23px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { position: relative; min-height: 68px; display: flex; align-items: center; padding: 16px 42px 16px 0; color: var(--ink); font-weight: 900; list-style: none; cursor: pointer; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { position: absolute; right: 0; content: "+"; color: var(--teal-dark); font-size: 26px; font-weight: 400; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0; padding: 0 34px 22px 0; color: var(--muted); font-size: 14px; }

.site-footer { padding-top: 64px; color: #D5E7E5; background: #0B202E; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, .7fr) minmax(0, 1fr); gap: 55px; padding-bottom: 46px; }
.footer-brand img { width: min(320px, 100%); padding: 7px; background: var(--white); border-radius: 8px; }
.footer-brand p { max-width: 440px; }
.footer-grid h2 { margin: 0 0 13px; color: var(--white); font-size: 16px; }
.footer-grid p { margin: 9px 0 0; font-size: 14px; }
.footer-grid a { min-height: 44px; display: flex; align-items: center; color: var(--white); font-size: 14px; }
.footer-grid a:hover { text-decoration: underline; }
.footer-bottom { padding-block: 20px; border-top: 1px solid rgba(255,255,255,.14); font-size: 13px; }
.back-to-top { position: fixed; right: 22px; bottom: 22px; z-index: 25; width: 48px; min-height: 48px; color: var(--ink); background: var(--lime); border: 0; border-radius: 8px; box-shadow: var(--shadow); font-size: 23px; font-weight: 900; }
.back-to-top[hidden] { display: none; }

@media (max-width: 1060px) {
  .hero-layout { gap: 40px; }
  .site-menu { gap: 17px; }
  .process-layout, .selection-layout, .faq-layout { gap: 45px; }
}
@media (max-width: 900px) {
  .hero-layout, .process-layout, .selection-layout, .faq-layout { grid-template-columns: 1fr; }
  .hero-layout { gap: 42px; }
  .efficiency-panel { max-width: 650px; }
  .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .header-main { min-height: 72px; }
  .brand { width: min(290px, calc(100% - 62px)); }
  .menu-toggle { display: block; flex: 0 0 48px; }
  .site-menu { position: absolute; top: 100%; right: 24px; left: 24px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px; background: var(--white); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); }
  .site-menu.is-open { display: flex; }
  .site-menu a { min-height: 48px; justify-content: center; }
  .product-head, .catalog-tail { align-items: start; flex-direction: column; }
}
@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1180px); }
  .header-line-inner { justify-content: center; }
  .header-line-inner span:last-child { display: none; }
  .brand { width: min(260px, calc(100% - 58px)); }
  .section { padding-block: 68px; }
  .hero-layout { min-height: 0; padding-block: 56px 65px; }
  .hero h1 { font-size: clamp(34px, 9vw, 43px); }
  .hero-lead { font-size: 16px; }
  .hero-actions, .hero-actions .button { width: 100%; }
  .efficiency-panel { border-radius: 12px; }
  .panel-top, .panel-focus { padding-inline: 21px; }
  .panel-steps { padding-inline: 21px; }
  .panel-bottom { padding-inline: 21px; }
  .section-head h2, .process-intro h2, .selection-heading h2, .faq-heading h2 { font-size: 31px; }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .product-visual { padding: 10px; }
  .product-index { top: 8px; left: 8px; min-width: 26px; height: 25px; font-size: 11px; }
  .product-content { padding: 12px 11px 15px; }
  .product-content h3 { min-height: 42px; font-size: 15px; }
  .product-content strong { font-size: 16px; }
  .scenario-grid, .selection-grid { grid-template-columns: 1fr; }
  .scenario-grid article { min-height: 0; }
  .scenario-grid h3 { margin-top: 24px; }
  .process-steps li { grid-template-columns: 38px 1fr; gap: 12px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .back-to-top { right: 14px; bottom: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}