:root {
  --ink: #102327;
  --ink-soft: #30474b;
  --paper: #f7faf8;
  --white: #ffffff;
  --line: #ccd8d4;
  --green: #009a62;
  --green-dark: #006e49;
  --mint: #dcefe7;
  --amber: #e6b34a;
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); letter-spacing: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.site-body { min-width: 320px; }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 10;
  display: grid;
  height: 78px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 clamp(20px, 4vw, 72px);
  border-bottom: 1px solid rgba(255,255,255,.18);
  color: var(--white);
}
.site-brand { display: inline-flex; width: fit-content; align-items: center; gap: 11px; font-size: 14px; font-weight: 700; text-decoration: none; }
.site-brand img { width: 34px; height: 34px; border-radius: 4px; }
.site-header nav { display: flex; gap: 34px; }
.site-header nav a { color: rgba(255,255,255,.75); font-size: 13px; text-decoration: none; }
.site-header nav a:hover { color: var(--white); }
.header-actions { display: flex; justify-self: end; align-items: center; gap: 8px; }
.contact-trigger, .header-download { min-height: 40px; padding: 9px 17px; border: 1px solid rgba(255,255,255,.6); border-radius: 4px; color: var(--white); background: transparent; font-size: 13px; text-decoration: none; }
.contact-trigger { cursor: pointer; }
.contact-trigger:hover,
.header-download:hover { color: var(--ink); background: var(--white); }

.hero {
  position: relative;
  display: flex;
  min-height: min(820px, 84vh);
  align-items: center;
  overflow: hidden;
  color: var(--white);
  background: #061b20 url("/index.php?asset=simulator-ui.png") center 12% / cover no-repeat;
}
.hero-shade { position: absolute; inset: 0; background: rgba(4, 24, 28, .78); }
.hero-content { position: relative; z-index: 2; width: min(720px, 88vw); margin-left: clamp(20px, 9vw, 160px); padding: 126px 0 110px; }
.version-line { display: flex; gap: 11px; margin-bottom: 26px; }
.version-line span { padding: 6px 8px; border: 1px solid rgba(255,255,255,.3); border-radius: 3px; color: rgba(255,255,255,.8); font-size: 11px; font-weight: 700; }
.version-line span:first-child { color: #091f1d; border-color: var(--amber); background: var(--amber); }
.hero h1 { margin: 0; font-size: clamp(54px, 8vw, 112px); line-height: .94; font-weight: 740; }
.hero-content > p { max-width: 650px; margin: 28px 0 34px; color: rgba(255,255,255,.78); font-size: clamp(17px, 2vw, 22px); line-height: 1.75; text-wrap: pretty; }
.hero-actions { display: flex; align-items: center; gap: 25px; }
.download-button { display: inline-flex; min-height: 64px; align-items: center; gap: 14px; padding: 9px 20px 9px 10px; border: 1px solid #41bd87; border-radius: 5px; color: var(--white); background: var(--green); text-decoration: none; }
.download-button:hover { border-color: #56d29c; background: var(--green-dark); }
.download-button .download-icon { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 3px; color: var(--green-dark); background: var(--white); font-size: 25px; }
.download-button strong, .download-button small { display: block; }
.download-button strong { font-size: 15px; }
.download-button small { margin-top: 4px; color: rgba(255,255,255,.74); font-size: 11px; }
.download-button.disabled, .header-download.disabled { cursor: not-allowed; opacity: .62; }
.text-link { color: var(--white); font-size: 13px; text-decoration: none; }
.text-link:hover { color: var(--amber); }
.hero-meta { position: absolute; right: clamp(20px, 4vw, 72px); bottom: 30px; z-index: 2; display: flex; gap: 24px; color: rgba(255,255,255,.55); font-size: 11px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta span::before { width: 5px; height: 5px; border-radius: 50%; background: var(--green); content: ""; }

.intro-band { display: grid; width: min(1180px, calc(100% - 40px)); grid-template-columns: 220px 1fr; gap: 50px; margin: 0 auto; padding: 112px 0 72px; border-bottom: 1px solid var(--line); }
.section-kicker { color: var(--green-dark); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.intro-copy { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); gap: 70px; align-items: end; }
.intro-copy h2, .interface-heading h2, .requirements-section h2 { margin: 0; font-size: clamp(30px, 4vw, 54px); line-height: 1.24; font-weight: 700; text-wrap: pretty; }
.intro-copy p, .interface-heading > p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.9; }

.feature-grid { display: grid; width: min(1180px, calc(100% - 40px)); grid-template-columns: repeat(4, 1fr); margin: 0 auto; padding: 0 0 112px; }
.feature-grid article { min-height: 260px; padding: 36px 28px; border-right: 1px solid var(--line); }
.feature-grid article:first-child { border-left: 1px solid var(--line); }
.feature-number { color: var(--green); font: 700 12px Consolas, monospace; }
.feature-grid h3 { margin: 70px 0 14px; font-size: 19px; }
.feature-grid p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.75; }

.interface-section { padding: 105px max(20px, 5vw) 118px; color: var(--white); background: #10262b; }
.interface-heading { display: grid; width: min(1180px, 100%); grid-template-columns: minmax(0, 1.4fr) minmax(280px, .6fr); gap: 70px; align-items: end; margin: 0 auto 54px; }
.interface-heading .section-kicker { display: block; margin-bottom: 18px; color: #55c694; }
.interface-heading > p { color: #a9bdbb; }
.product-shot { width: min(1180px, 100%); margin: 0 auto; }
.product-shot img { width: 100%; border: 1px solid #496166; background: var(--white); box-shadow: 0 28px 80px rgba(0,0,0,.3); }
.product-shot figcaption { display: flex; justify-content: space-between; padding-top: 13px; color: #79908f; font: 11px Consolas, monospace; }

.workflow-band { padding: 86px max(20px, 5vw); background: var(--mint); }
.workflow-band > * { width: min(1180px, 100%); margin-right: auto; margin-left: auto; }
.workflow-band > p { margin-top: 0; margin-bottom: 38px; }
.workflow-band ol { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 0; margin-bottom: 0; padding: 0; list-style: none; }
.workflow-band li { display: flex; min-height: 90px; align-items: center; gap: 20px; border-top: 1px solid #9ebcb0; border-bottom: 1px solid #9ebcb0; }
.workflow-band li + li { padding-left: 28px; border-left: 1px solid #9ebcb0; }
.workflow-band li span { color: var(--green-dark); font: 700 12px Consolas, monospace; }
.workflow-band li strong { font-size: 15px; }

.requirements-section { display: grid; width: min(1180px, calc(100% - 40px)); grid-template-columns: 1fr 1fr auto; gap: 70px; align-items: end; margin: 0 auto; padding: 110px 0; }
.requirements-section .section-kicker { display: block; margin-bottom: 18px; }
.requirements-section dl { margin: 0; border-top: 1px solid var(--line); }
.requirements-section dl div { display: grid; grid-template-columns: 100px 1fr; padding: 14px 0; border-bottom: 1px solid var(--line); }
.requirements-section dt { color: var(--ink-soft); font-size: 12px; }
.requirements-section dd { margin: 0; font-size: 14px; font-weight: 650; }
.download-button.dark { border-color: #142f35; background: #142f35; }
.download-button.dark:hover { background: #204149; }
.download-button.dark .download-icon { color: var(--white); background: var(--green); }

.site-footer { display: flex; justify-content: space-between; padding: 27px max(20px, 5vw); color: #82918f; background: #091a1e; font-size: 11px; }

.contact-dialog { width: min(420px, calc(100vw - 32px)); padding: 0; border: 1px solid #486067; border-radius: 6px; color: var(--white); background: #10262b; box-shadow: 0 28px 90px rgba(0,0,0,.42); }
.contact-dialog::backdrop { background: rgba(3,18,22,.78); }
.contact-sheet { position: relative; padding: 34px; }
.dialog-close { position: absolute; top: 16px; right: 16px; display: grid; width: 40px; height: 40px; place-items: center; padding: 0; border: 1px solid #496166; border-radius: 4px; color: #bdd0cd; background: transparent; font-size: 24px; line-height: 1; cursor: pointer; }
.dialog-close:hover { color: var(--ink); background: var(--white); }
.contact-kicker { color: #55c694; font-size: 11px; font-weight: 800; }
.contact-sheet h2 { margin: 14px 52px 28px 0; font-size: 26px; }
.qq-detail { display: flex; min-height: 82px; align-items: center; justify-content: space-between; gap: 20px; padding: 0 18px; border: 1px solid #486067; background: #0b2025; }
.qq-detail span { color: #8ba3a1; font-size: 12px; }
.qq-detail strong { overflow-wrap: anywhere; color: var(--white); font: 700 27px Consolas, monospace; }
.copy-contact { width: 100%; min-height: 46px; margin-top: 14px; border: 1px solid #41bd87; border-radius: 4px; color: var(--white); background: var(--green); font-weight: 700; cursor: pointer; }
.copy-contact:hover { background: var(--green-dark); }
.copy-status { min-height: 18px; margin: 10px 0 0; color: #8fd7b8; font-size: 12px; text-align: center; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { display: none; }
  .hero { min-height: 84vh; }
  .hero-content { margin-left: max(20px, 6vw); }
  .intro-band { grid-template-columns: 1fr; gap: 22px; }
  .intro-copy, .interface-heading { grid-template-columns: 1fr; gap: 24px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid article:nth-child(3) { border-left: 1px solid var(--line); }
  .requirements-section { grid-template-columns: 1fr 1fr; }
  .requirements-section .download-button { width: fit-content; }
}

@media (max-width: 600px) {
  .site-header { height: 66px; padding: 0 18px; }
  .site-brand span { font-size: 12px; }
  .contact-trigger, .header-download { min-height: 40px; padding: 8px 10px; }
  .header-actions { gap: 6px; }
  .contact-sheet { padding: 28px 22px 22px; }
  .qq-detail { padding: 0 14px; }
  .qq-detail strong { font-size: 24px; }
  .hero { min-height: 760px; background-position: 55% top; }
  .hero-content { width: calc(100% - 36px); margin: 0 18px; padding-top: 112px; }
  .hero h1 { font-size: 54px; }
  .hero-content > p { font-size: 16px; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-meta { right: 18px; bottom: 20px; left: 18px; justify-content: space-between; gap: 8px; }
  .intro-band { padding-top: 76px; }
  .intro-copy { display: block; }
  .intro-copy p { margin-top: 24px; }
  .feature-grid { grid-template-columns: 1fr; padding-bottom: 78px; }
  .feature-grid article { min-height: 210px; border-left: 1px solid var(--line); }
  .feature-grid h3 { margin-top: 45px; }
  .interface-section { padding-top: 78px; padding-bottom: 82px; }
  .workflow-band { padding-top: 70px; padding-bottom: 70px; }
  .workflow-band ol { grid-template-columns: 1fr; }
  .workflow-band li + li { padding-left: 0; border-top: 0; border-left: 0; }
  .requirements-section { grid-template-columns: 1fr; gap: 34px; padding: 78px 0; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}