:root {
  --color-primary: #f97316;
  --color-primary-dark: #ea580c;
  --color-primary-light: #fb923c;
  --color-primary-soft: #fff7ed;
  --color-accent: #7c2d12;
  --color-bg: #faf9f7;
  --color-bg-alt: #f3f1ee;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-border: #e8e3dd;
  --color-text: #1f1a17;
  --color-text-secondary: #5c534c;
  --color-text-muted: #8a8078;
  --color-shadow: rgba(124, 45, 18, 0.08);
  --color-shadow-strong: rgba(124, 45, 18, 0.16);
  --gradient-hero: linear-gradient(135deg, #fff7ed 0%, #ffedd5 30%, #fed7aa 65%, #fdba74 100%);
  --gradient-btn: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  --gradient-btn-hover: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14110f;
    --color-bg-alt: #1c1815;
    --color-surface: #221d19;
    --color-surface-glass: rgba(34, 29, 25, 0.78);
    --color-border: #362e28;
    --color-text: #f5f0eb;
    --color-text-secondary: #c4b8ad;
    --color-text-muted: #8a7e73;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-strong: rgba(0, 0, 0, 0.5);
    --color-primary-soft: #2a1f15;
    --gradient-hero: linear-gradient(135deg, #1c1815 0%, #2a1f15 35%, #3d2210 70%, #4a2a12 100%);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  margin-bottom: 1.2rem;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: var(--gradient-btn);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin-bottom: 0.6rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

blockquote {
  margin: 1rem 0;
  padding: 1rem 1.4rem;
  background: var(--color-primary-soft);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--color-text);
}

/* ============ HEADER ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-smooth), background var(--transition-smooth);
}

#site-header:hover {
  box-shadow: 0 4px 24px var(--color-shadow);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-text);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--color-primary);
}

.logo svg {
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
  transition: box-shadow var(--transition-fast);
}

.logo:hover svg {
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.5);
}

#site-header nav {
  flex: 1 1 auto;
  min-width: 0;
}

#site-header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.5rem;
  align-items: center;
}

#site-header nav a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

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

#site-header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

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

#site-header input[type="search"] {
  width: 200px;
  padding: 0.5rem 0.9rem;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), width var(--transition-smooth);
}

#site-header input[type="search"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.18);
  width: 240px;
}

#site-header button[type="submit"] {
  padding: 0.5rem 1.1rem;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-btn);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#site-header button[type="submit"]:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(249, 115, 22, 0.4);
}

#site-header button[type="submit"]:active {
  transform: translateY(0);
}

/* ============ MAIN ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

/* ============ HERO ============ */
#hero {
  position: relative;
  margin: 1.5rem 0 2rem;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.5rem, 4vw, 3rem);
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 50px var(--color-shadow);
  animation: heroFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

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

#hero::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.35), transparent 70%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -80px;
  left: -40px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(234, 88, 12, 0.28), transparent 70%);
  pointer-events: none;
}

#hero h1 {
  position: relative;
  z-index: 1;
  color: var(--color-accent);
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.4);
}

@media (prefers-color-scheme: dark) {
  #hero h1 {
    color: #fed7aa;
    text-shadow: none;
  }
}

#hero p {
  position: relative;
  z-index: 1;
  max-width: 820px;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  color: var(--color-text-secondary);
}

#hero svg {
  position: relative;
  z-index: 1;
  margin-top: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 30px var(--color-shadow);
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 1.5rem 0 0.5rem;
}

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
  color: #fff;
  background: var(--gradient-btn);
  box-shadow: 0 8px 22px rgba(249, 115, 22, 0.35);
}

.btn-primary:hover {
  color: #fff;
  background: var(--gradient-btn-hover);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(249, 115, 22, 0.5);
}

.btn-secondary {
  color: var(--color-primary-dark);
  background: var(--color-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1.5px solid var(--color-primary);
}

.btn-secondary:hover {
  color: #fff;
  background: var(--color-primary);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(249, 115, 22, 0.4);
}

/* ============ BREADCRUMB & ANCHOR NAV ============ */
main > nav[aria-label="面包屑导航"] {
  margin: 0 0 1rem;
  font-size: 0.85rem;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  color: var(--color-text-muted);
}

main > nav[aria-label="面包屑导航"] ol li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--color-text-muted);
}

main > nav[aria-label="面包屑导航"] a {
  color: var(--color-text-secondary);
}

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

main > nav[aria-label="页面锚点导航"] {
  margin: 0 0 2rem;
  padding: 0.85rem 1.1rem;
  background: var(--color-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px var(--color-shadow);
}

main > nav[aria-label="页面锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
}

main > nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-alt);
  border-radius: 999px;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

main > nav[aria-label="页面锚点导航"] a:hover {
  background: var(--gradient-btn);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.3);
}

/* ============ SECTIONS ============ */
main > section {
  margin-bottom: 2rem;
  padding: clamp(1.5rem, 3.5vw, 2.5rem);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth), border-color var(--transition-smooth);
  animation: sectionReveal 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

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

@supports not (animation-timeline: view()) {
  main > section {
    animation: sectionReveal 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
  }
}

main > section:hover {
  box-shadow: 0 12px 36px var(--color-shadow-strong);
  border-color: rgba(249, 115, 22, 0.25);
}

main > section ul {
  list-style: none;
  padding-left: 0;
}

main > section ul li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

main > section ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient-btn);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.12);
}

main > section ol {
  list-style: none;
  counter-reset: step-counter;
  padding-left: 0;
}

main > section ol li {
  position: relative;
  padding-left: 2.4rem;
  margin-bottom: 0.75rem;
  counter-increment: step-counter;
  color: var(--color-text-secondary);
}

main > section ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 1.7rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-btn);
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(249, 115, 22, 0.35);
}

/* ============ NEWS & ARTICLES ============ */
#news article,
#articles article {
  position: relative;
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth), background var(--transition-smooth);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px var(--color-shadow-strong);
  border-color: rgba(249, 115, 22, 0.3);
  background: var(--color-surface);
}

#news article h3,
#articles article h3 {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

#news article p,
#articles article p {
  font-size: 0.92rem;
  margin-bottom: 0.5rem;
}

#news article p:first-of-type,
#articles article p:first-of-type {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

#news article a,
#articles article a {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

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

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 0.75rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-smooth), border-color var(--transition-smooth), background var(--transition-smooth);
}

#faq details:hover {
  border-color: rgba(249, 115, 22, 0.3);
  box-shadow: 0 6px 20px var(--color-shadow);
}

#faq details[open] {
  background: var(--color-surface);
  border-color: var(--color-primary);
  box-shadow: 0 8px 26px var(--color-shadow-strong);
}

#faq summary {
  position: relative;
  padding: 1rem 3rem 1rem 1.4rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.6rem;
  height: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-btn);
  border-radius: 50%;
  transition: transform var(--transition-smooth), background var(--transition-fast);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

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

#faq details p {
  padding: 0 1.4rem 1.2rem;
  font-size: 0.92rem;
  margin-bottom: 0;
  animation: faqFade 0.35s ease both;
}

@keyframes faqFade {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ CONTACT ============ */
#contact address {
  font-style: normal;
  padding: 1.2rem 1.4rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

#contact address p {
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
}

#contact address a {
  font-weight: 600;
}

/* ============ SITEMAP & LINKS ============ */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
}

#sitemap ul li,
#links ul li {
  padding-left: 0;
  margin-bottom: 0;
}

#sitemap ul li::before,
#links ul li::before {
  display: none;
}

#sitemap ul a,
#links ul a {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap ul a:hover,
#links ul a:hover {
  background: var(--gradient-btn);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
}

/* ============ FOOTER ============ */
footer {
  margin-top: 2rem;
  padding: 2.5rem 1.25rem 2rem;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  transition: background var(--transition-smooth);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  padding: 0 0.25rem;
}

footer > section:last-child {
  margin-bottom: 0;
}

footer h2 {
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
}

footer h2::after {
  width: 32px;
  height: 3px;
}

footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
}

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

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

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .header-inner {
    gap: 0.75rem;
  }

  #site-header nav {
    order: 3;
    flex-basis: 100%;
  }

  #site-header nav ul {
    justify-content: flex-start;
    gap: 0.1rem 0.3rem;
  }

  #site-header nav a {
    font-size: 0.82rem;
    padding: 0.3rem 0.5rem;
  }

  #site-header form[role="search"] {
    margin-left: auto;
  }

  #site-header input[type="search"] {
    width: 150px;
  }

  #site-header input[type="search"]:focus {
    width: 180px;
  }
}

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

  .header-inner {
    padding: 0.6rem 0.9rem;
  }

  .logo span {
    font-size: 1.05rem;
  }

  #site-header form[role="search"] {
    flex-basis: 100%;
    order: 4;
    margin-left: 0;
  }

  #site-header input[type="search"] {
    flex: 1;
    width: auto;
  }

  #site-header input[type="search"]:focus {
    width: auto;
  }

  main {
    padding: 0 0.9rem 2rem;
  }

  #hero {
    margin: 1rem 0 1.5rem;
    padding: 1.5rem 1.1rem;
    border-radius: var(--radius-lg);
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    text-align: center;
    width: 100%;
  }

  main > section {
    padding: 1.2rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
  }

  #news article,
  #articles article {
    padding: 1rem 1.1rem;
  }

  #faq summary {
    padding: 0.85rem 2.6rem 0.85rem 1.1rem;
    font-size: 0.92rem;
  }

  #faq summary::after {
    right: 0.9rem;
    width: 1.4rem;
    height: 1.4rem;
    font-size: 1rem;
  }

  #faq details p {
    padding: 0 1.1rem 1rem;
  }

  footer {
    padding: 1.75rem 0.9rem 1.5rem;
  }
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-alt);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-primary-light), var(--color-primary-dark));
  border-radius: 999px;
  border: 2px solid var(--color-bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

/* ============ SELECTION ============ */
::selection {
  background: rgba(249, 115, 22, 0.28);
  color: var(--color-text);
}

/* ============ FOCUS VISIBLE ============ */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}