:root {
  --primary: #2b7a78;
  --primary-light: #3aafa9;
  --primary-dark: #17252a;
  --accent: #fe7e6d;
  --accent-2: #ffb347;
  --bg: #f5f9f9;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #1f2d2b;
  --text-soft: #4a5c5a;
  --text-muted: #7a8c8a;
  --border: rgba(43, 122, 120, 0.16);
  --border-strong: rgba(43, 122, 120, 0.32);
  --shadow-sm: 0 2px 8px rgba(23, 37, 42, 0.06);
  --shadow-md: 0 10px 30px rgba(23, 37, 42, 0.10);
  --shadow-lg: 0 24px 60px rgba(23, 37, 42, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #2b7a78 0%, #3aafa9 45%, #7fdbca 100%);
  --gradient-accent: linear-gradient(135deg, #fe7e6d 0%, #ffb347 100%);
  --gradient-soft: linear-gradient(135deg, rgba(43, 122, 120, 0.10), rgba(58, 175, 169, 0.06));
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-blur: blur(18px) saturate(160%);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1180px;
  --header-h: 68px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition: 0.28s var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #3aafa9;
    --primary-light: #7fdbca;
    --primary-dark: #0b1416;
    --accent: #ff8e7d;
    --accent-2: #ffc266;
    --bg: #0b1416;
    --bg-alt: #101d20;
    --surface: rgba(20, 34, 37, 0.72);
    --surface-solid: #142225;
    --text: #e8f2f1;
    --text-soft: #b8cbc9;
    --text-muted: #8aa19e;
    --border: rgba(127, 219, 202, 0.16);
    --border-strong: rgba(127, 219, 202, 0.34);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
    --gradient-hero: linear-gradient(135deg, #0f2b2c 0%, #1c5f5c 45%, #2b7a78 100%);
    --gradient-soft: linear-gradient(135deg, rgba(58, 175, 169, 0.14), rgba(127, 219, 202, 0.06));
    --glass-bg: rgba(16, 29, 32, 0.55);
    --glass-border: rgba(127, 219, 202, 0.18);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(58, 175, 169, 0.14), transparent 42%),
    radial-gradient(circle at 88% 92%, rgba(254, 126, 109, 0.10), transparent 46%),
    radial-gradient(circle at 92% 12%, rgba(255, 179, 71, 0.08), transparent 40%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 6px;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: var(--gradient-accent);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--primary);
}

p {
  margin: 0 0 1em;
  color: var(--text-soft);
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.45em;
}

strong {
  color: var(--text);
}

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

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

header > div {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

header > div > a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text);
  padding: 8px 0;
  white-space: nowrap;
}

header > div > a::before {
  content: "";
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: var(--gradient-hero);
  box-shadow: 0 4px 14px rgba(43, 122, 120, 0.35);
  flex: 0 0 auto;
  transition: transform var(--transition);
}

header > div > a:hover::before {
  transform: rotate(-12deg) scale(1.08);
}

header > div > a:hover {
  color: var(--primary);
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

header nav li {
  margin: 0;
}

header nav a {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

header nav a:hover {
  color: var(--primary);
  background: var(--gradient-soft);
  transform: translateY(-1px);
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 60px;
}

main > nav[aria-label="面包屑导航"] {
  margin: 20px 0 8px;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 8px 16px;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: 999px;
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

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

main > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--text-muted);
  opacity: 0.6;
}

main > nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

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

main > section {
  position: relative;
  margin: 28px 0;
  padding: 32px clamp(18px, 4vw, 44px);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: fadeUp 0.7s var(--ease) both;
}

main > section:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

main > section > h2 {
  margin-top: 0;
}

main > section > h3 {
  margin-top: 1.6em;
}

main > section > h3:first-of-type {
  margin-top: 0.6em;
}

/* ============ Hero ============ */

#hero {
  margin-top: 20px;
  padding: clamp(30px, 5vw, 60px) clamp(20px, 5vw, 56px);
  background: var(--gradient-hero);
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 60px rgba(43, 122, 120, 0.32);
  overflow: hidden;
  color: #ffffff;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.28), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(255, 179, 71, 0.30), transparent 50%);
  pointer-events: none;
  z-index: -1;
}

#hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  border: 2px dashed rgba(255, 255, 255, 0.28);
  pointer-events: none;
  z-index: -1;
  animation: spin 40s linear infinite;
}

#hero h1 {
  color: #ffffff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
  max-width: 22em;
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  max-width: 62em;
  font-size: 1.02rem;
}

#hero p:last-child {
  margin-bottom: 0;
}

#hero:hover {
  transform: translateY(-3px);
}

/* ============ Articles ============ */

#articles article {
  position: relative;
  margin: 0 0 18px;
  padding: 22px 24px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#articles article:last-child {
  margin-bottom: 0;
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#articles article h3 {
  margin-top: 0;
  margin-bottom: 6px;
  color: var(--text);
  transition: color var(--transition);
}

#articles article:hover h3 {
  color: var(--primary);
}

#articles article p:first-of-type {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--primary);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  padding: 2px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

#articles article p {
  color: var(--text-soft);
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

#articles article a:hover {
  background: var(--gradient-accent);
  color: #ffffff;
  border-color: transparent;
  transform: translateX(2px);
  box-shadow: 0 8px 20px rgba(254, 126, 109, 0.32);
}

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

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

#faq h3 {
  position: relative;
  margin-top: 1.5em;
  padding: 14px 18px 14px 44px;
  font-size: 1.02rem;
  color: var(--text);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: default;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #ffffff;
  border-radius: 50%;
  background: var(--gradient-hero);
  box-shadow: 0 2px 8px rgba(43, 122, 120, 0.30);
}

#faq h3:hover {
  border-color: var(--border-strong);
  transform: translateX(3px);
}

#faq h3 + p {
  padding-left: 44px;
  margin-top: -4px;
}

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

#howto {
  background: var(--gradient-soft), var(--surface);
}

#howto h3 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

#howto h3::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--gradient-accent);
  flex: 0 0 auto;
}

#howto p:last-of-type {
  margin-bottom: 0;
}

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

#contact {
  border: 1px solid var(--border-strong);
}

#contact h3 {
  color: var(--accent);
}

#contact h3 + p {
  padding: 14px 18px;
  background: var(--bg-alt);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.2em;
}

/* ============ Sitemap & Links ============ */

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px 14px;
  padding: 0;
  list-style: none;
  margin: 0;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition), background var(--transition);
}

#sitemap a::before {
  content: "▸ ";
  color: var(--primary);
  font-weight: 700;
}

#links a::before {
  content: "🔗 ";
}

#sitemap a:hover,
#links a:hover {
  color: var(--primary);
  border-color: var(--border-strong);
  background: var(--gradient-soft);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

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

footer {
  margin-top: 40px;
  padding: 48px 20px 32px;
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.82);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 0%, rgba(58, 175, 169, 0.22), transparent 42%),
    radial-gradient(circle at 90% 100%, rgba(254, 126, 109, 0.14), transparent 46%);
  pointer-events: none;
}

footer > section {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
}

footer h2 {
  color: #ffffff;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
}

footer h3 {
  color: var(--primary-light);
  font-size: 1rem;
  margin-top: 1.4em;
}

footer p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

footer p:last-child {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

footer a {
  color: var(--primary-light);
}

footer a:hover {
  color: var(--accent-2);
}

/* ============ Scroll animations ============ */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

main > section:nth-of-type(1) { animation-delay: 0.02s; }
main > section:nth-of-type(2) { animation-delay: 0.06s; }
main > section:nth-of-type(3) { animation-delay: 0.10s; }
main > section:nth-of-type(4) { animation-delay: 0.14s; }
main > section:nth-of-type(5) { animation-delay: 0.18s; }
main > section:nth-of-type(6) { animation-delay: 0.22s; }
main > section:nth-of-type(7) { animation-delay: 0.26s; }
main > section:nth-of-type(8) { animation-delay: 0.30s; }
main > section:nth-of-type(9) { animation-delay: 0.34s; }
main > section:nth-of-type(10) { animation-delay: 0.38s; }

@supports (animation-timeline: view()) {
  main > section {
    animation: none;
    animation-timeline: view();
    animation-range: entry 0% cover 26%;
    animation-name: fadeUp;
    animation-fill-mode: both;
    animation-duration: 0.01s;
  }
}

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

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

@media (max-width: 900px) {
  header > div {
    padding: 8px 16px;
    gap: 10px;
  }

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

  header nav {
    width: 100%;
  }

  header nav ul {
    gap: 2px;
    padding-bottom: 6px;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  header nav ul::-webkit-scrollbar {
    display: none;
  }

  header nav a {
    white-space: nowrap;
    font-size: 0.85rem;
    padding: 6px 10px;
  }

  main {
    padding: 0 14px 40px;
  }

  main > section {
    padding: 24px 18px;
    margin: 20px 0;
    border-radius: var(--radius-md);
  }

  #hero {
    border-radius: var(--radius-lg);
  }

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

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  header > div > a::before {
    width: 26px;
    height: 26px;
  }

  main > nav[aria-label="面包屑导航"] ol {
    font-size: 0.78rem;
    padding: 6px 12px;
  }

  #hero p {
    font-size: 0.95rem;
  }

  #articles article {
    padding: 18px 16px;
  }

  #faq h3 {
    padding: 12px 14px 12px 40px;
    font-size: 0.96rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  footer {
    padding: 36px 16px 26px;
  }
}

@media (hover: none) {
  main > section:hover,
  #articles article:hover,
  #sitemap a:hover,
  #links a:hover {
    transform: none;
  }
}
</style>