:root {
  color-scheme: light;
  --ink: #18313b;
  --muted: #506269;
  --teal: #155f59;
  --deep: #102f35;
  --mint: #d9eee5;
  --orange: #e49a65;
  --line: #d9e6e1;
  --paper: #fffefa;
  --wash: #f3f7f5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 16px/1.68 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans CJK SC", sans-serif; }
a { color: var(--teal); text-underline-offset: 4px; }
a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; padding: .55rem .8rem; background: white; }

.site-header { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 2rem; min-height: 74px; padding: .75rem max(1.25rem, calc((100vw - 1220px) / 2)); background: #fffefaee; border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.brand { display: inline-flex; align-items: center; gap: .65rem; color: var(--ink); font-size: 1.04rem; font-weight: 850; letter-spacing: -.025em; text-decoration: none; white-space: nowrap; }
.brand img { display: block; flex: 0 0 35px; border-radius: 8px; }
.site-header nav { display: flex; align-items: center; justify-content: flex-end; gap: clamp(.8rem, 2vw, 1.8rem); }
.site-header nav a { color: var(--ink); font-size: .85rem; font-weight: 700; text-decoration: none; white-space: nowrap; }
.site-header nav a:hover { color: var(--teal); text-decoration: underline; }
.site-header .nav-repo { padding: .48rem .78rem; border: 1px solid #adcac1; border-radius: 6px; }
.site-header .lang { color: var(--teal); }

.hero { display: grid; grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr); align-items: center; gap: clamp(2rem, 5vw, 5.5rem); min-height: 610px; padding: clamp(3.3rem, 6vw, 6rem) max(1.25rem, calc((100vw - 1220px) / 2)); color: #f3f9f6; background: radial-gradient(circle at 78% 12%, #28645f 0, transparent 33%), linear-gradient(135deg, #153d41, #102b35 72%); }
.hero-copy { min-width: 0; }
.hero h1 { margin: 0 0 1.2rem; font-size: clamp(3.1rem, 5vw, 5rem); line-height: 1.02; letter-spacing: -.065em; }
.hero .eyebrow { margin: 0 0 1.3rem; color: #a8d9c7; font-size: .74rem; font-weight: 800; letter-spacing: .16em; }
.hero-copy > p:nth-of-type(2) { margin: 0 0 1.2rem; color: #d7e8e3; font-size: clamp(1.08rem, 1.45vw, 1.27rem); line-height: 1.58; }
.hero-copy a { color: #e9faf0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 47px; padding: .65rem 1.05rem; border: 1px solid #b7d8cc; border-radius: 6px; font-size: .9rem; font-weight: 800; text-decoration: none; }
.hero-copy .button.primary { color: var(--deep); background: #eaf7ee; border-color: #eaf7ee; }
.hero-copy .button.secondary { color: #eef9f3; background: transparent; }
.button:hover { transform: translateY(-2px); }
.hero-visual { min-width: 0; margin: 0; padding: .65rem; border: 1px solid #82aca166; border-radius: 14px; background: #ffffff14; box-shadow: 0 30px 70px #061a2370; }
.hero-visual p { margin: 0; }
.hero-visual img { display: block; width: 100%; height: auto; border-radius: 9px; }
.hero-visual figcaption { padding: .7rem .25rem .1rem; color: #bcd6cc; font-size: .76rem; }

.content-wrap { max-width: 1220px; margin: 0 auto; padding: 0 1.25rem; }
.content-section { padding: clamp(3.2rem, 6vw, 6.2rem) 0; border-bottom: 1px solid var(--line); }
.content-section h2 { margin: 0 0 1.1rem; font-size: clamp(2.15rem, 4vw, 4rem); letter-spacing: -.055em; line-height: 1.12; }
.content-section h3 { margin: 2rem 0 .6rem; font-size: 1.2rem; line-height: 1.3; }
.content-section p { margin: 1rem 0; color: var(--muted); font-size: 1.02rem; }
.content-section > p:first-of-type { color: var(--ink); font-size: 1.13rem; }
.content-section strong { color: var(--ink); }
.content-section ul, .content-section ol { padding-left: 1.4rem; }
.content-section li { margin: .7rem 0; }
.content-section pre { overflow-x: auto; margin: 1rem 0 2rem; padding: 1.25rem 1.35rem; border-radius: 9px; background: #173840; color: #f3f9f6; font-size: .9rem; line-height: 1.6; }
.content-section pre code { background: none; color: inherit; padding: 0; white-space: pre; }
.content-section code { overflow-wrap: anywhere; padding: .1rem .25rem; border-radius: 3px; color: #124f50; background: #e8f2ee; }
.content-section img { max-width: 100%; height: auto; }

.section-1 p { margin-top: .4rem; }
.section-1 ul { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin: 1.6rem 0; padding: 0; list-style: none; }
.section-1 li { display: flex; flex-direction: column; gap: 1rem; min-width: 0; margin: 0; padding: 1.4rem; border: 1px solid var(--line); border-radius: 9px; background: var(--wash); line-height: 1.65; }
.section-1 li strong { display: block; color: var(--ink); font-size: 1.12rem; line-height: 1.35; }
.section-1 li a { display: inline-block; margin-top: auto; font-weight: 750; }
.section-1 p:last-child { padding: 1rem 1.2rem; border-left: 3px solid var(--teal); background: var(--wash); font-size: .94rem; }
.section-2 ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin: 2.2rem 0; padding: 0; list-style: none; counter-reset: item; }
.section-2 li { position: relative; min-height: 185px; margin: 0; padding: 3.4rem 1.25rem 1.25rem; border: 1px solid var(--line); border-radius: 8px; background: var(--wash); counter-increment: item; }
.section-2 li::before { content: counter(item, decimal-leading-zero); position: absolute; top: 1.05rem; left: 1.25rem; color: #a64d27; font: 800 .85rem ui-monospace, SFMono-Regular, monospace; }
.section-2 li strong { display: block; margin-bottom: .45rem; font-size: 1.03rem; }
.section-2 li:nth-child(1), .section-2 li:nth-child(4) { background: #edf6f0; }
.section-3 { background: linear-gradient(90deg, #fffefa, #f7faf7); }
.section-3 ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin: 2rem 0; padding: 0; list-style: none; counter-reset: method; }
.section-3 li { position: relative; margin: 0; padding: 3.3rem 1.3rem 1.4rem; border: 1px solid var(--line); border-radius: 9px; background: var(--wash); counter-increment: method; }
.section-3 li::before { content: counter(method, decimal-leading-zero); position: absolute; top: 1.1rem; left: 1.3rem; color: #a64d27; font: 800 .85rem ui-monospace, SFMono-Regular, monospace; }
.section-3 li strong { display: block; margin-bottom: .6rem; font-size: 1.12rem; line-height: 1.35; }
.section-3 > p:last-child { padding: 1.2rem 1.4rem; border-left: 3px solid var(--teal); background: #edf6f0; }
.section-4 { padding: clamp(3.2rem, 6vw, 6rem); margin: 0 -1.25rem; background: #ecf5f0; }
.section-4 h2 { margin-bottom: 1.6rem; }
.section-4 > p:first-of-type { font-size: 1.08rem; }
.section-4 pre { border-left: 4px solid #70c0a0; }
.section-6 { background: linear-gradient(90deg, #fffefa, #f7faf7); }
.section-7 { border-bottom: 0; }
.section-7 p { font-size: .94rem; }
.site-footer { display: flex; justify-content: space-between; gap: 2rem; padding: 2rem max(1.25rem, calc((100vw - 1220px) / 2)); color: #d6e6df; background: var(--deep); font-size: .82rem; }
.site-footer a { color: #eaf7ee; }

@media (max-width: 900px) {
  .site-header { position: static; flex-wrap: wrap; gap: .7rem; }
  .site-header nav { width: 100%; justify-content: flex-start; flex-wrap: wrap; gap: .65rem 1rem; }
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero h1 { max-width: none; }
  .hero-visual { max-width: 760px; }
  .section-1 ul { grid-template-columns: 1fr; }
  .section-2 ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-3 ol { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .site-header { padding: .8rem 1rem; }
  .site-header nav a:nth-child(2), .site-header nav a:nth-child(3) { display: none; }
  .hero { padding: 3.2rem 1rem 3.5rem; gap: 2rem; }
  .hero h1 { font-size: clamp(3rem, 13vw, 4.3rem); }
  .hero-actions { display: grid; }
  .content-wrap { padding: 0 1rem; }
  .content-section { padding: 3.5rem 0; }
  .section-2 ol { grid-template-columns: 1fr; }
  .section-2 li { min-height: 0; }
  .section-4 { margin: 0 -1rem; padding: 3.4rem 1rem; }
  .content-section pre code { white-space: pre-wrap; overflow-wrap: anywhere; }
  .site-footer { display: block; padding: 2rem 1rem; }
  .site-footer span { display: block; margin-bottom: .75rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .button:hover { transform: none; } }
@media print { .site-header, .hero-actions, .site-footer { display: none; } .hero { display: block; min-height: 0; padding: 1rem 0; color: var(--ink); background: none; } .hero .eyebrow, .hero-copy > p:nth-of-type(2) { color: var(--ink); } .hero-visual { max-width: 50%; box-shadow: none; border-color: var(--line); } .content-section { break-inside: avoid; padding: 1.5rem 0; } .section-4 { margin: 0; padding: 1.5rem 0; background: none; } .section-2 li { min-height: 0; } }