:root {
  --color-primary: #1a4d2e;
  --color-primary-light: #2e7d5b;
  --color-primary-lighter: #3a9d6e;
  --color-accent: #7ee2a8;
  --color-accent-soft: #b8f2d0;
  --color-bg: #f4f9f6;
  --color-bg-alt: #eaf4ee;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-text: #14261c;
  --color-text-soft: #3d5548;
  --color-text-muted: #6b8074;
  --color-border: rgba(26, 77, 46, 0.12);
  --color-shadow: rgba(20, 60, 38, 0.1);
  --color-shadow-strong: rgba(20, 60, 38, 0.18);
  --gradient-hero: linear-gradient(135deg, #1a4d2e 0%, #2e7d5b 45%, #3a9d6e 75%, #7ee2a8 130%);
  --gradient-accent: linear-gradient(120deg, #2e7d5b 0%, #7ee2a8 100%);
  --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(234, 244, 238, 0.7));
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --space-xs: 0.5rem;
  --space-sm: 0.875rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --container: 1180px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --transition: 0.32s cubic-bezier(0.22, 1, 0.36, 1);
  --blur: saturate(160%) blur(14px);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #7ee2a8;
    --color-primary-light: #57c98a;
    --color-primary-lighter: #3a9d6e;
    --color-accent: #b8f2d0;
    --color-accent-soft: #2e7d5b;
    --color-bg: #0c1712;
    --color-bg-alt: #101f18;
    --color-surface: #14271d;
    --color-surface-glass: rgba(20, 39, 29, 0.68);
    --color-text: #e6f4ec;
    --color-text-soft: #b9d4c5;
    --color-text-muted: #85a294;
    --color-border: rgba(126, 226, 168, 0.16);
    --color-shadow: rgba(0, 0, 0, 0.45);
    --color-shadow-strong: rgba(0, 0, 0, 0.65);
    --gradient-hero: linear-gradient(135deg, #0c1712 0%, #143526 45%, #1a4d2e 80%, #2e7d5b 130%);
    --gradient-accent: linear-gradient(120deg, #3a9d6e 0%, #b8f2d0 100%);
    --gradient-card: linear-gradient(160deg, rgba(26, 49, 36, 0.9), rgba(16, 31, 24, 0.7));
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(1000px 500px at 10% -10%, rgba(126, 226, 168, 0.14), transparent 60%),
    radial-gradient(900px 480px at 95% 0%, rgba(46, 125, 91, 0.12), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--color-primary-lighter);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 var(--space-sm);
}

h1 { font-size: clamp(1.75rem, 4.2vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.35rem); }
h4 { font-size: clamp(1rem, 1.8vw, 1.15rem); }

p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-soft);
}

ul, ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.35rem;
  color: var(--color-text-soft);
}

li {
  margin-bottom: 0.4rem;
}

li::marker {
  color: var(--color-primary-light);
}

blockquote {
  margin: 0 0 var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-primary-light);
  border-radius: var(--radius-sm);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  color: var(--color-text-soft);
  font-style: italic;
  box-shadow: 0 6px 20px var(--color-shadow);
}

figure {
  margin: 0 0 var(--space-md);
}

figcaption {
  margin-top: var(--space-xs);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ============ Header / Navigation ============ */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 24px var(--color-shadow);
  animation: slideDown 0.6s var(--transition) both;
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

header nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-md);
}

header nav > a {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-text);
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: filter var(--transition);
}

header nav > a:hover {
  filter: brightness(1.15);
  text-decoration: none;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav ul li {
  margin: 0;
}

header nav ul a {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  color: var(--color-text-soft);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

header nav ul a:hover,
header nav ul a:focus-visible {
  background: rgba(126, 226, 168, 0.18);
  color: var(--color-primary-light);
  transform: translateY(-1px);
  text-decoration: none;
}

/* ============ Main layout ============ */

main {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) var(--space-xl);
}

main > nav[aria-label="面包屑"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: var(--space-sm) 0 var(--space-md);
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  width: fit-content;
}

main > nav[aria-label="面包屑"] li {
  margin: 0;
  display: flex;
  align-items: center;
}

main > nav[aria-label="面包屑"] li + li::before {
  content: "/";
  margin: 0 0.5rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

main > nav[aria-label="面包屑"] a {
  color: var(--color-primary-light);
}

/* ============ Sections ============ */

section {
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  background: var(--gradient-card);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 34px var(--color-shadow);
  animation: fadeUp 0.7s var(--transition) both;
  animation-timeline: view();
  animation-range: entry 0% entry 55%;
}

@supports not (animation-timeline: view()) {
  section {
    animation: fadeUp 0.6s var(--transition) both;
  }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

section:hover {
  border-color: rgba(126, 226, 168, 0.35);
  box-shadow: 0 16px 44px var(--color-shadow-strong);
  transition: box-shadow var(--transition), border-color var(--transition);
}

/* Hero section */

section[aria-labelledby="hero-title"] {
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
  color: #f0f7f2;
  border: none;
  padding: clamp(2rem, 5vw, 3.5rem);
  isolation: isolate;
}

section[aria-labelledby="hero-title"]::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto auto;
  width: 60%;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(126, 226, 168, 0.35), transparent 65%);
  filter: blur(30px);
  z-index: -1;
  animation: floatGlow 9s ease-in-out infinite alternate;
}

@keyframes floatGlow {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(-6%, 8%) scale(1.12); }
}

section[aria-labelledby="hero-title"] h1 {
  color: #ffffff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.25);
  max-width: 22ch;
}

section[aria-labelledby="hero-title"] p {
  color: rgba(240, 247, 242, 0.92);
  max-width: 68ch;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
}

section[aria-labelledby="hero-title"] figure {
  margin-top: var(--space-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition);
}

section[aria-labelledby="hero-title"] figure:hover {
  transform: scale(1.012);
}

section[aria-labelledby="hero-title"] svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

section[aria-labelledby="hero-title"] figcaption {
  color: rgba(240, 247, 242, 0.75);
}

/* ============ Article cards (技术文章) ============ */

#articles {
  display: flex;
  flex-direction: column;
}

#articles > article {
  position: relative;
  padding: var(--space-md) var(--space-md) var(--space-md) calc(var(--space-md) + 6px);
  margin-bottom: var(--space-sm);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#articles > article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14%;
  bottom: 14%;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  opacity: 0.85;
}

#articles > article:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px var(--color-shadow-strong);
  border-color: rgba(126, 226, 168, 0.4);
}

#articles > article h3 {
  margin-bottom: var(--space-xs);
}

#articles > article p {
  margin-bottom: var(--space-xs);
  font-size: 0.94rem;
}

#articles > article a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary-light);
  text-decoration: none;
}

#articles > article a::after {
  content: "→";
  transition: transform var(--transition);
}

#articles > article a:hover::after {
  transform: translateX(4px);
}

/* ============ FAQ ============ */

#faq h3 {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
  padding-bottom: 0.4rem;
  border-bottom: 1px dashed var(--color-border);
  font-size: clamp(1rem, 1.9vw, 1.15rem);
}

#faq h3::before {
  content: "Q";
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  margin-top: 0.1rem;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #0c1712;
  font-size: 0.82rem;
  font-weight: 800;
}

#faq h3 + p {
  margin-left: 2.15rem;
  font-size: 0.95rem;
}

/* ============ HowTo ============ */

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 0.6rem 0.9rem 0.6rem 3rem;
  margin-bottom: var(--space-xs);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.7rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #0c1712;
  font-size: 0.85rem;
  font-weight: 800;
}

#howto ol li:hover {
  transform: translateX(4px);
  border-color: rgba(126, 226, 168, 0.4);
}

/* ============ Contact ============ */

#contact p {
  padding: 0.5rem 0.9rem;
  margin-bottom: var(--space-xs);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  transition: border-color var(--transition), transform var(--transition);
}

#contact p:hover {
  border-color: rgba(126, 226, 168, 0.4);
  transform: translateX(3px);
}

/* ============ Sitemap & links ============ */

section[aria-labelledby="sitemap-title"] ul,
section[aria-labelledby="links-title"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
  padding: 0;
}

section[aria-labelledby="sitemap-title"] li,
section[aria-labelledby="links-title"] li {
  margin: 0;
}

section[aria-labelledby="sitemap-title"] a,
section[aria-labelledby="links-title"] a {
  display: inline-block;
  padding: 0.42rem 1rem;
  border-radius: var(--radius-pill);
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--color-border);
  font-size: 0.88rem;
  color: var(--color-text-soft);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition), border-color var(--transition);
}

section[aria-labelledby="sitemap-title"] a:hover,
section[aria-labelledby="links-title"] a:hover {
  background: var(--gradient-accent);
  color: #0c1712;
  border-color: transparent;
  transform: translateY(-2px);
  text-decoration: none;
}

/* ============ Footer ============ */

footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) var(--space-md);
  background: var(--gradient-hero);
  color: rgba(240, 247, 242, 0.9);
  border-top: 1px solid var(--color-border);
}

footer section {
  max-width: var(--container);
  margin: 0 auto var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.06);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  box-shadow: none;
  animation: fadeUp 0.6s var(--transition) both;
}

footer section:hover {
  box-shadow: none;
  border-color: rgba(126, 226, 168, 0.35);
}

footer h2 {
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: var(--space-xs);
}

footer p {
  color: rgba(240, 247, 242, 0.8);
  font-size: 0.9rem;
  margin-bottom: var(--space-xs);
}

footer > p {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
  text-align: center;
  font-size: 0.82rem;
  color: rgba(240, 247, 242, 0.65);
}

footer > p + p {
  margin-top: 0.3rem;
}

/* ============ Responsive ============ */

@media (max-width: 900px) {
  header nav {
    padding: var(--space-xs) var(--space-sm);
    gap: var(--space-xs);
  }

  header nav ul {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.25rem;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }

  header nav ul li {
    flex: 0 0 auto;
  }

  main {
    padding: var(--space-sm) var(--space-sm) var(--space-lg);
  }

  section {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  section[aria-labelledby="hero-title"] {
    padding: var(--space-lg) var(--space-md);
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  header nav > a {
    font-size: 0.98rem;
  }

  header nav ul a {
    padding: 0.35rem 0.65rem;
    font-size: 0.84rem;
  }

  main > nav[aria-label="面包屑"] ol {
    font-size: 0.78rem;
    padding: 0.45rem 0.8rem;
  }

  section {
    padding: var(--space-md) var(--space-sm);
    margin-bottom: var(--space-md);
  }

  section[aria-labelledby="hero-title"] h1 {
    max-width: none;
  }

  #faq h3 + p {
    margin-left: 0;
  }

  #howto ol li {
    padding-left: 2.7rem;
  }

  blockquote {
    padding: var(--space-sm) var(--space-md);
  }

  footer {
    padding: var(--space-md) var(--space-xs);
  }

  footer section {
    padding: var(--space-sm) var(--space-md);
  }
}

/* ============ Motion preferences ============ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Print ============ */

@media print {
  header,
  footer,
  section[aria-labelledby="sitemap-title"],
  section[aria-labelledby="links-title"] {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  section {
    box-shadow: none;
    border: 1px solid #ccc;
    animation: none;
  }
}