:root {
  --primary: #e8622c;
  --primary-dark: #c94f1e;
  --primary-light: #f2a65a;
  --accent-green: #7fb069;
  --accent-blue: #4a90a4;
  --accent-red: #c05746;
  --bg: #fdf3ec;
  --bg-alt: #ffffff;
  --bg-soft: #fff8f3;
  --text: #2b2320;
  --text-soft: #5a4f49;
  --text-muted: #8a7d76;
  --border: rgba(232, 98, 44, 0.16);
  --card-bg: rgba(255, 255, 255, 0.72);
  --card-border: rgba(255, 255, 255, 0.6);
  --shadow-sm: 0 2px 8px rgba(120, 70, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(120, 70, 40, 0.1);
  --shadow-lg: 0 18px 48px rgba(120, 70, 40, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #e8622c 0%, #f2a65a 45%, #7fb069 100%);
  --gradient-soft: linear-gradient(135deg, rgba(232, 98, 44, 0.08), rgba(127, 176, 105, 0.08));
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.85), rgba(255, 248, 243, 0.6));
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #ff7a45;
    --primary-dark: #e8622c;
    --primary-light: #ffb27a;
    --accent-green: #8fc47a;
    --accent-blue: #5ba3b8;
    --accent-red: #d96b58;
    --bg: #16120f;
    --bg-alt: #1f1a16;
    --bg-soft: #241d18;
    --text: #f3ece7;
    --text-soft: #cbbfb7;
    --text-muted: #9a8c83;
    --border: rgba(255, 122, 69, 0.22);
    --card-bg: rgba(38, 30, 25, 0.68);
    --card-border: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.55);
    --gradient-hero: linear-gradient(135deg, #c94f1e 0%, #b06a2a 45%, #4f7a3f 100%);
    --gradient-soft: linear-gradient(135deg, rgba(255, 122, 69, 0.1), rgba(143, 196, 122, 0.08));
    --gradient-card: linear-gradient(145deg, rgba(48, 38, 32, 0.85), rgba(32, 26, 22, 0.65));
  }
}

*,
*::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(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(232, 98, 44, 0.1), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(127, 176, 105, 0.1), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(74, 144, 164, 0.08), transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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,
a:focus-visible {
  color: var(--primary-dark);
}

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

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

h1 { font-size: clamp(1.7rem, 3.6vw, 2.6rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.95rem); margin: 0 0 1rem; }
h3 { font-size: clamp(1.1rem, 1.9vw, 1.35rem); margin: 1.6rem 0 0.75rem; }
h4 { font-size: 1.05rem; margin: 1.2rem 0 0.5rem; }

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

ul, ol {
  padding-left: 1.4rem;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4rem;
}

/* ============ Header ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.45rem clamp(1rem, 4vw, 3rem);
  font-size: 0.82rem;
  color: #fff;
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: gradientShift 14s ease infinite;
}

.top-bar span {
  color: #fff;
  opacity: 0.95;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

nav[aria-label="主导航"] {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem clamp(1rem, 4vw, 2rem);
}

.logo a {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  transition: transform var(--transition);
  display: inline-block;
}

.logo a:hover {
  transform: scale(1.04);
}

nav[aria-label="主导航"] > ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

nav[aria-label="主导航"] > ul li {
  margin: 0;
}

nav[aria-label="主导航"] > ul a {
  display: inline-block;
  padding: 0.35rem 0.55rem;
  font-size: 0.94rem;
  color: var(--text-soft);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

nav[aria-label="主导航"] > ul a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

nav[aria-label="主导航"] > ul a:hover {
  color: var(--primary);
  background: rgba(232, 98, 44, 0.06);
}

nav[aria-label="主导航"] > ul a:hover::after {
  width: 60%;
}

form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
}

form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

form[role="search"] input[type="search"] {
  width: 190px;
  padding: 0.5rem 0.85rem;
  font-size: 0.88rem;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: width var(--transition), border-color var(--transition), box-shadow var(--transition);
}

form[role="search"] input[type="search"]::placeholder {
  color: var(--text-muted);
}

form[role="search"] input[type="search"]:focus {
  width: 230px;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 98, 44, 0.15);
  outline: none;
}

form[role="search"] button {
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-hero);
  background-size: 160% 160%;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background-position var(--transition);
}

form[role="search"] button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  background-position: 100% 50%;
}

/* ============ Breadcrumb ============ */
nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 1rem auto 0;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  color: var(--text-muted);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

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

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

/* ============ Main layout ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 2rem) 3rem;
}

main > section {
  margin-top: 2.5rem;
  padding: clamp(1.4rem, 3vw, 2.4rem);
  background: var(--card-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: fadeUp 0.7s ease both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

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

main > section > h2:first-child {
  position: relative;
  padding-bottom: 0.7rem;
  margin-bottom: 1.3rem;
}

main > section > h2:first-child::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-hero);
}

/* ============ Hero ============ */
#hero {
  position: relative;
  overflow: hidden;
  margin-top: 1.5rem;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.4rem, 4vw, 3rem);
  background: var(--gradient-hero);
  background-size: 220% 220%;
  animation: gradientShift 16s ease infinite, fadeUp 0.7s ease both;
  border: none;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, 0.22), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.12), transparent 40%);
  pointer-events: none;
}

#hero h1,
#hero p,
#hero figcaption {
  position: relative;
  color: #fff;
}

#hero h1 {
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  max-width: 70ch;
}

#hero figure {
  position: relative;
  margin: 1.8rem 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.9);
  transition: transform var(--transition), box-shadow var(--transition);
}

#hero figure:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
}

#hero svg {
  width: 100%;
  height: auto;
  display: block;
}

#hero figcaption {
  padding: 0.7rem 1rem;
  font-size: 0.85rem;
  text-align: center;
  color: var(--text-muted);
  background: var(--bg-alt);
}

/* ============ Cards / Articles ============ */
#knowledge > article,
#news > article {
  padding: 1.3rem 1.5rem;
  margin-bottom: 1.1rem;
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#knowledge > article:last-child,
#news > article:last-child {
  margin-bottom: 0;
}

#knowledge > article:hover,
#news > article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}

#knowledge > article h3,
#news > article h3 {
  margin-top: 0;
  color: var(--text);
}

#knowledge > article time,
#news > article time {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.15rem 0.65rem;
  background: var(--gradient-soft);
  border-radius: 999px;
}

#knowledge > article a {
  display: inline-block;
  font-weight: 600;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#knowledge > article a:hover {
  transform: translateX(3px);
  box-shadow: var(--shadow-sm);
  background: rgba(232, 98, 44, 0.14);
}

/* ============ Article detail sections ============ */
main > section[id^="article-"] {
  background: var(--gradient-card);
}

main > section[id^="article-"] h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
}

/* ============ Blockquotes / testimonials ============ */
#testimonials blockquote {
  position: relative;
  margin: 0 0 1.1rem;
  padding: 1.2rem 1.4rem 1.2rem 2.6rem;
  background: var(--gradient-card);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#testimonials blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

#testimonials blockquote::before {
  content: "\201C";
  position: absolute;
  left: 0.7rem;
  top: 0.1rem;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.35;
  font-family: Georgia, serif;
}

#testimonials blockquote p {
  margin: 0 0 0.6rem;
  font-style: italic;
}

#testimonials blockquote cite {
  display: block;
  font-size: 0.85rem;
  font-style: normal;
  color: var(--text-muted);
  text-align: right;
}

#testimonials blockquote:last-child {
  margin-bottom: 0;
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 0.75rem;
  padding: 0.2rem 1.2rem;
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
  overflow: hidden;
}

#faq details[open] {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
}

#faq details:hover {
  border-color: var(--border);
}

#faq summary {
  cursor: pointer;
  padding: 0.9rem 0;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 2rem;
  transition: color var(--transition);
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: "+";
  position: absolute;
  right: 0.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  content: "−";
}

#faq summary:hover {
  color: var(--primary);
}

#faq details p {
  margin: 0 0 1rem;
  padding-top: 0.2rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.9rem;
  animation: fadeIn 0.35s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ Contact ============ */
#contact address {
  font-style: normal;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

#contact address p {
  margin: 0 0 0.45rem;
}

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

/* ============ Sitemap / Links ============ */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

#sitemap a,
#links a {
  display: block;
  padding: 0.55rem 0.9rem;
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition);
}

#sitemap a:hover,
#links a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}

/* ============ Footer ============ */
footer[role="contentinfo"] {
  margin-top: 3rem;
  padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) 1.5rem;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-top: 1px solid var(--border);
}

footer[role="contentinfo"] > section {
  max-width: var(--max-width);
  margin: 0 auto 1.8rem;
  padding: 1.2rem 1.4rem;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

footer[role="contentinfo"] > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

footer[role="contentinfo"] h2 {
  font-size: 1.1rem;
  margin: 0 0 0.7rem;
  color: var(--primary);
}

footer[role="contentinfo"] h3 {
  font-size: 0.98rem;
  margin: 0.9rem 0 0.4rem;
  color: var(--text);
}

footer[role="contentinfo"] p {
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
  color: var(--text-muted);
}

footer[role="contentinfo"] p:last-child {
  margin-bottom: 0;
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  nav[aria-label="主导航"] {
    gap: 0.6rem 1rem;
  }

  nav[aria-label="主导航"] > ul {
    order: 3;
    flex-basis: 100%;
    justify-content: center;
  }

  form[role="search"] {
    margin-left: 0;
  }

  form[role="search"] input[type="search"] {
    width: 150px;
  }

  form[role="search"] input[type="search"]:focus {
    width: 180px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .top-bar {
    flex-direction: column;
    gap: 0.15rem;
    text-align: center;
    font-size: 0.76rem;
  }

  nav[aria-label="主导航"] {
    padding: 0.6rem 1rem;
  }

  .logo a {
    font-size: 1.2rem;
  }

  nav[aria-label="主导航"] > ul {
    gap: 0.15rem 0.5rem;
  }

  nav[aria-label="主导航"] > ul a {
    font-size: 0.85rem;
    padding: 0.3rem 0.45rem;
  }

  form[role="search"] {
    width: 100%;
  }

  form[role="search"] input[type="search"],
  form[role="search"] input[type="search"]:focus {
    width: 100%;
    flex: 1;
  }

  main {
    padding: 0.5rem 0.9rem 2rem;
  }

  main > section {
    margin-top: 1.5rem;
    padding: 1.1rem 1rem;
    border-radius: var(--radius-md);
  }

  #hero {
    padding: 1.6rem 1.1rem;
    border-radius: var(--radius-md);
  }

  #knowledge > article,
  #news > article {
    padding: 1rem 0.95rem;
  }

  #testimonials blockquote {
    padding: 1rem 1rem 1rem 2.2rem;
  }

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

  footer[role="contentinfo"] > section {
    padding: 1rem 0.95rem;
  }
}

@media (max-width: 400px) {
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }
}

/* ============ Reduced motion ============ */
@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[role="banner"],
  nav[aria-label="面包屑导航"],
  footer[role="contentinfo"],
  form[role="search"] {
    display: none !important;
  }

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

  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}