:root {
  color-scheme: light;
  --ink: #12262c;
  --muted: #466168;
  --accent: #04665b;
  --paper: #f4f8f6;
  --line: #d3e1dc;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.6;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); }
a { color: var(--accent); text-underline-offset: .22em; }
a:focus-visible { outline: 3px solid #b46818; outline-offset: 4px; }
img { max-width: 100%; height: auto; }
.wrap { width: min(1180px, calc(100% - 64px)); margin-inline: auto; }
.skip { position: absolute; top: 8px; left: 8px; padding: 10px; background: white; transform: translateY(-200%); }
.skip:focus { transform: none; }
.hero { display: grid; grid-template-columns: 1fr 1.18fr; align-items: center; gap: clamp(28px, 5vw, 72px); padding-block: 70px 54px; }
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--accent); font-weight: 700; font-size: 14px; letter-spacing: .08em; }
.eyebrow span, .demo-dot { width: 8px; height: 8px; border-radius: 50%; background: #30ad94; }
h1, h2, h3 { line-height: 1.25; }
.hero h1 { font-size: clamp(39px, 5.1vw, 70px); margin: 16px 0 22px; letter-spacing: -.045em; }
.intro { font-size: clamp(16px, 1.8vw, 19px); color: var(--muted); max-width: 29em; }
.buttons { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 48px; padding: 10px 17px; border-radius: 8px; border: 1px solid transparent; font-weight: 700; text-decoration: none; }
.primary { background: var(--accent); color: white; }
.primary:hover { background: #084d45; }
.secondary { border-color: #a9c2b9; color: var(--ink); background: #fcfefc; }
.secondary:hover { background: #e7f3ec; }
.release { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 13px; color: var(--muted); font-size: 13px; margin-top: 18px; }
.release strong { color: var(--accent); background: #e0efe8; padding: 1px 8px; border-radius: 5px; }
.demo { min-width: 0; margin: 0; padding: 12px; border-radius: 14px; background: #152b30; color: #eaf7f3; box-shadow: 0 16px 35px #1b433029; }
.demo-bar { display: flex; align-items: center; gap: 9px; padding: 3px 4px 11px; font-size: 13px; }
.demo-tag { margin-left: auto; color: #adccca; }
.demo img { display: block; width: 100%; border-radius: 6px; }
.demo figcaption { color: #c6ddda; font-size: 13px; padding: 10px 4px 1px; }
.resources { border-top: 1px solid var(--line); padding: 27px 0 54px; }
.resources h2 { margin: 0 0 17px; font-size: 23px; }
.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.resource { display: flex; align-items: center; gap: 16px; padding: 19px; min-height: 105px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: #fcfefc; text-decoration: none; }
.resource:hover { border-color: var(--accent); }
.resource-index { align-self: flex-start; color: var(--accent); font: 700 14px ui-monospace, monospace; padding: 6px; background: #e4f2ec; border-radius: 5px; }
.resource strong, .resource strong + span { display: block; }
.resource strong { font-size: 19px; }
.resource strong + span { font-size: 14px; color: var(--muted); margin-top: 3px; }
.arrow { margin-left: auto; color: var(--accent); font-size: 23px; }
.content { padding-block: 35px 64px; }
.content > h1 { font-size: clamp(32px, 5vw, 48px); margin-bottom: 12px; }
.content .intro { max-width: 42em; }
.panel, .article { background: white; border: 1px solid var(--line); border-radius: 10px; padding: clamp(16px, 4vw, 32px); margin-block: 18px; }
.panel h2 { margin-top: 0; }
.panel p:last-child { margin-bottom: 0; }
.download-check { margin-top: 16px; color: var(--muted); }
.download-check summary { width: fit-content; cursor: pointer; color: var(--accent); }
.check-option:not([hidden]) { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 14px; margin-block: 12px; }
.check-option button { font: inherit; font-weight: 700; cursor: pointer; }
.check-option button:disabled { opacity: .65; cursor: wait; }
.check-option span { flex: 1 1 18em; font-size: 14px; }
.check-result { padding: 10px 12px; border-radius: 6px; background: var(--paper); }
.check-result[data-state="success"] { background: #e0efe8; color: #075746; }
.check-result[data-state="error"] { background: #fff0eb; color: #8b2d20; }
.article { max-width: 860px; overflow-wrap: anywhere; }
.article h2 { border-bottom: 1px solid var(--line); padding-bottom: 8px; margin-top: 1.6em; }
.article table { border-collapse: collapse; width: 100%; }
.article td, .article th { padding: 7px; border: 1px solid var(--line); text-align: left; }
.article pre { overflow: auto; padding: 12px; background: var(--paper); }
.article img { border-radius: 6px; }
.training-actions { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.training-actions a { display: inline-block; padding-block: 4px; }
.tutorial-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.tutorial-grid .panel { display: flex; flex-direction: column; margin: 0; padding: clamp(16px, 2vw, 24px); }
.tutorial-grid .panel h2 { margin-bottom: 0; font-size: clamp(18px, 2vw, 23px); }
.tutorial-grid .training-actions { margin-top: auto; }
.reading-layout { display: grid; grid-template-columns: minmax(190px, 240px) minmax(0, 1fr); align-items: start; gap: 20px; margin-top: 12px; }
.reading-sidebar { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow: auto; background: white; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.reading-sidebar summary { cursor: pointer; font-weight: 700; }
.reading-sidebar ul { list-style: none; margin: 8px 0 0; padding: 0; }
.reading-sidebar a { display: block; padding: 5px 7px; border-radius: 6px; font-size: 14px; text-decoration: none; }
.reading-sidebar a:hover, .reading-sidebar a:focus-visible { background: var(--paper); text-decoration: underline; }
.reading-level-3 { padding-left: 12px; }
.reading-content > .article { margin-top: 0; max-width: none; }
.reading-content > h1 { margin-top: 0; }
.reading-content [id] { scroll-margin-top: 14px; }
.slide { margin: 0 0 24px; }
.slide img { display: block; width: 100%; border: 1px solid var(--line); border-radius: 8px; }
.slide figcaption { margin-top: 5px; color: var(--muted); font-size: 14px; }

@media print {
  @page { size: A4; margin: 16mm 17mm; }
  body { background: white; font-size: 10.5pt; }
  .training-actions { display: none; }
  .wrap, .content { width: auto; padding: 0; }
  .article { max-width: none; margin: 0; padding: 0; border: 0; }
  .article h1, .article h2, .article h3 { break-after: avoid; }
  .article img { max-height: 147mm; width: auto; object-fit: contain; break-inside: avoid; }
  .article tr { break-inside: avoid; }
}

@media (max-width: 850px) {
  .wrap { width: calc(100% - 40px); }
  .hero { grid-template-columns: 1fr; padding-block: 35px; gap: 26px; }
}
@media (max-width: 780px) {
  .tutorial-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading-layout { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .reading-sidebar { position: static; max-height: none; }
}
@media (max-width: 570px) {
  .wrap { width: calc(100% - 30px); }
  .hero h1 { font-size: clamp(34px, 9vw, 49px); }
  .resource-grid { grid-template-columns: 1fr; }
  .tutorial-grid { grid-template-columns: 1fr; }
}