:root {
  --mango-primary: #ff6b1a;
  --mango-primary-dark: #e0550a;
  --mango-secondary: #ffb347;
  --mango-accent: #ff8c42;
  --mango-bg: #fff8f2;
  --mango-bg-alt: #ffffff;
  --mango-surface: rgba(255, 255, 255, 0.72);
  --mango-surface-solid: #ffffff;
  --mango-text: #2b1d14;
  --mango-text-soft: #6b5546;
  --mango-text-muted: #9a8577;
  --mango-border: rgba(255, 107, 26, 0.16);
  --mango-border-strong: rgba(255, 107, 26, 0.32);
  --mango-shadow: 0 10px 30px rgba(255, 107, 26, 0.12);
  --mango-shadow-lg: 0 20px 50px rgba(255, 107, 26, 0.18);
  --mango-radius: 18px;
  --mango-radius-sm: 12px;
  --mango-radius-lg: 26px;
  --mango-gradient: linear-gradient(135deg, #ff6b1a 0%, #ff8c42 45%, #ffb347 100%);
  --mango-gradient-soft: linear-gradient(135deg, rgba(255, 107, 26, 0.1) 0%, rgba(255, 179, 71, 0.14) 100%);
  --mango-glass: rgba(255, 255, 255, 0.55);
  --mango-glass-border: rgba(255, 255, 255, 0.65);
  --mango-transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --mango-max-width: 1180px;
  --mango-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --mango-bg: #16100c;
    --mango-bg-alt: #1e1712;
    --mango-surface: rgba(38, 28, 22, 0.68);
    --mango-surface-solid: #241b15;
    --mango-text: #f6ede6;
    --mango-text-soft: #d3c2b5;
    --mango-text-muted: #a08e80;
    --mango-border: rgba(255, 140, 66, 0.22);
    --mango-border-strong: rgba(255, 140, 66, 0.42);
    --mango-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    --mango-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
    --mango-glass: rgba(38, 28, 22, 0.55);
    --mango-glass-border: rgba(255, 140, 66, 0.28);
    --mango-gradient-soft: linear-gradient(135deg, rgba(255, 107, 26, 0.16) 0%, rgba(255, 179, 71, 0.1) 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  font-family: var(--mango-font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mango-text);
  background-color: var(--mango-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 179, 71, 0.18), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(255, 107, 26, 0.14), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(255, 140, 66, 0.1), transparent 55%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--mango-transition), color var(--mango-transition);
}

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

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

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

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  line-height: 1.32;
  font-weight: 700;
  color: var(--mango-text);
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  background: var(--mango-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 6px;
  border-radius: 6px;
  background: var(--mango-gradient);
}

h3 {
  font-size: clamp(1.1rem, 1.9vw, 1.3rem);
}

h4 {
  font-size: 1.05rem;
  color: var(--mango-text-soft);
}

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

/* ===== Header ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--mango-glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--mango-glass-border);
  box-shadow: 0 4px 24px rgba(255, 107, 26, 0.08);
  transition: background var(--mango-transition), box-shadow var(--mango-transition);
}

header > div {
  max-width: var(--mango-max-width);
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

header > div > a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--mango-text);
  flex-shrink: 0;
}

header > div > a svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 6px 16px rgba(255, 107, 26, 0.35);
  transition: transform var(--mango-transition);
}

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

header > div > a span {
  background: var(--mango-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

header nav {
  flex: 1 1 auto;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

header nav ul li a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--mango-text-soft);
  transition: background var(--mango-transition), color var(--mango-transition), transform var(--mango-transition);
}

header nav ul li a:hover {
  background: var(--mango-gradient-soft);
  color: var(--mango-primary-dark);
  transform: translateY(-2px);
}

header form {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  position: relative;
}

header form label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

header form input[type="search"] {
  width: 180px;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--mango-text);
  background: var(--mango-surface);
  border: 1px solid var(--mango-border);
  border-radius: 999px;
  transition: border var(--mango-transition), box-shadow var(--mango-transition), width var(--mango-transition);
}

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

header form input[type="search"]:focus {
  width: 220px;
  border-color: var(--mango-primary);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.16);
  outline: none;
}

header form button {
  padding: 8px 18px;
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--mango-gradient);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(255, 107, 26, 0.3);
  transition: transform var(--mango-transition), box-shadow var(--mango-transition), filter var(--mango-transition);
}

header form button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(255, 107, 26, 0.4);
  filter: brightness(1.05);
}

header form button:active {
  transform: translateY(0);
}

/* ===== Breadcrumb ===== */
body > nav[aria-label="面包屑导航"] {
  max-width: var(--mango-max-width);
  margin: 18px auto 0;
  padding: 0 22px;
}

body > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--mango-text-muted);
}

body > nav[aria-label="面包屑导航"] ol li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--mango-text-muted);
}

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

/* ===== Main layout ===== */
main {
  max-width: var(--mango-max-width);
  margin: 0 auto;
  padding: 0 22px 40px;
}

main section {
  margin: 28px 0;
  padding: 30px clamp(18px, 3.5vw, 40px);
  background: var(--mango-surface);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--mango-glass-border);
  border-radius: var(--mango-radius-lg);
  box-shadow: var(--mango-shadow);
  animation: mango-fade-up 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  transition: transform var(--mango-transition), box-shadow var(--mango-transition), border-color var(--mango-transition);
}

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

@keyframes mango-fade-up {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@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;
  }
}

/* ===== Hero ===== */
#hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 107, 26, 0.94) 0%, rgba(255, 140, 66, 0.9) 48%, rgba(255, 179, 71, 0.88) 100%);
  border: none;
  color: #fff;
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 52px);
  box-shadow: 0 24px 60px rgba(255, 107, 26, 0.32);
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.35), transparent 68%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -60% -15%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 70%);
  pointer-events: none;
}

#hero h1 {
  position: relative;
  z-index: 1;
  background: none;
  -webkit-text-fill-color: #fff;
  color: #fff;
  text-shadow: 0 2px 18px rgba(120, 50, 0, 0.28);
}

#hero p {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.94);
  max-width: 68ch;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
}

#hero > div {
  position: relative;
  z-index: 1;
  margin-top: 22px;
  border-radius: var(--mango-radius);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.28);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 0 16px 40px rgba(120, 50, 0, 0.2);
}

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

/* ===== Inner anchor nav ===== */
main > nav[aria-label="页内锚点导航"] {
  margin: 26px 0;
  padding: 16px 20px;
  background: var(--mango-surface);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--mango-glass-border);
  border-radius: var(--mango-radius);
  box-shadow: var(--mango-shadow);
}

main > nav[aria-label="页内锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

main > nav[aria-label="页内锚点导航"] ul li a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 999px;
  background: var(--mango-gradient-soft);
  color: var(--mango-text-soft);
  border: 1px solid transparent;
  transition: all var(--mango-transition);
}

main > nav[aria-label="页内锚点导航"] ul li a:hover {
  background: var(--mango-gradient);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(255, 107, 26, 0.3);
}

/* ===== Articles ===== */
#articles article {
  margin: 0 0 18px;
  padding: 22px 24px;
  background: var(--mango-surface-solid);
  border: 1px solid var(--mango-border);
  border-radius: var(--mango-radius);
  box-shadow: 0 6px 18px rgba(255, 107, 26, 0.06);
  position: relative;
  overflow: hidden;
  transition: transform var(--mango-transition), box-shadow var(--mango-transition), border-color var(--mango-transition);
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--mango-gradient);
  opacity: 0;
  transition: opacity var(--mango-transition);
}

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

#articles article:hover::before {
  opacity: 1;
}

#articles article h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
  transition: color var(--mango-transition);
}

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

#articles article p:first-of-type {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--mango-text-muted);
  background: var(--mango-gradient-soft);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--mango-gradient);
  color: #fff;
  box-shadow: 0 6px 14px rgba(255, 107, 26, 0.28);
  transition: transform var(--mango-transition), box-shadow var(--mango-transition);
}

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

#articles article a:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 107, 26, 0.4);
  color: #fff;
}

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

/* ===== FAQ ===== */
#faq details {
  margin: 0 0 12px;
  padding: 4px 20px;
  background: var(--mango-surface-solid);
  border: 1px solid var(--mango-border);
  border-radius: var(--mango-radius-sm);
  transition: border-color var(--mango-transition), box-shadow var(--mango-transition), background var(--mango-transition);
}

#faq details[open] {
  border-color: var(--mango-border-strong);
  box-shadow: 0 10px 26px rgba(255, 107, 26, 0.12);
  background: var(--mango-gradient-soft);
}

#faq summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--mango-text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  transition: color var(--mango-transition);
}

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

#faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: var(--mango-gradient);
  border-radius: 50%;
  transition: transform var(--mango-transition), box-shadow var(--mango-transition);
}

#faq details[open] summary::after {
  transform: rotate(45deg);
  box-shadow: 0 6px 14px rgba(255, 107, 26, 0.35);
}

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

#faq details p {
  padding: 0 0 14px;
  margin: 0;
  font-size: 0.92rem;
  border-top: 1px dashed var(--mango-border);
  padding-top: 12px;
  animation: mango-fade-up 0.4s ease both;
}

/* ===== Contact / lists ===== */
#contact ul,
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 10px;
  margin: 16px 0;
}

#contact ul li,
#sitemap ul li,
#links ul li {
  padding: 10px 16px;
  font-size: 0.9rem;
  color: var(--mango-text-soft);
  background: var(--mango-surface-solid);
  border: 1px solid var(--mango-border);
  border-radius: var(--mango-radius-sm);
  transition: transform var(--mango-transition), border-color var(--mango-transition), box-shadow var(--mango-transition);
}

#contact ul li:hover,
#sitemap ul li:hover,
#links ul li:hover {
  transform: translateY(-3px);
  border-color: var(--mango-border-strong);
  box-shadow: 0 10px 22px rgba(255, 107, 26, 0.14);
}

#sitemap ul li a,
#links ul li a {
  font-weight: 600;
}

/* ===== Reviews ===== */
#reviews p {
  padding: 14px 18px;
  background: var(--mango-surface-solid);
  border-left: 4px solid var(--mango-primary);
  border-radius: 0 var(--mango-radius-sm) var(--mango-radius-sm) 0;
  font-size: 0.94rem;
  color: var(--mango-text-soft);
  transition: transform var(--mango-transition), box-shadow var(--mango-transition);
}

#reviews p:hover {
  transform: translateX(4px);
  box-shadow: 0 8px 20px rgba(255, 107, 26, 0.12);
}

/* ===== Footer ===== */
footer {
  margin-top: 40px;
  padding: 40px 22px 28px;
  background: linear-gradient(180deg, rgba(255, 107, 26, 0.08) 0%, rgba(255, 140, 66, 0.05) 100%);
  border-top: 1px solid var(--mango-border);
}

footer section {
  max-width: var(--mango-max-width);
  margin: 0 auto 20px;
  padding: 20px 24px;
  background: var(--mango-surface);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--mango-glass-border);
  border-radius: var(--mango-radius);
  box-shadow: var(--mango-shadow);
}

footer section h2 {
  font-size: 1.1rem;
  padding-left: 14px;
}

footer section h2::before {
  width: 4px;
}

footer section p {
  font-size: 0.88rem;
  color: var(--mango-text-muted);
  margin-bottom: 0;
}

footer > p {
  max-width: var(--mango-max-width);
  margin: 0 auto 10px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--mango-text-muted);
}

footer > p a {
  display: inline-block;
  padding: 6px 18px;
  font-weight: 600;
  font-size: 0.85rem;
  color: #fff;
  background: var(--mango-gradient);
  border-radius: 999px;
  box-shadow: 0 6px 16px rgba(255, 107, 26, 0.3);
  transition: transform var(--mango-transition), box-shadow var(--mango-transition);
}

footer > p a:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(255, 107, 26, 0.42);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  header > div {
    gap: 12px;
  }

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

  header nav ul {
    justify-content: center;
  }

  header form {
    margin-left: auto;
  }

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

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

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

  header > div {
    padding: 10px 16px;
  }

  header > div > a span {
    font-size: 1.05rem;
  }

  header nav ul {
    gap: 2px;
  }

  header nav ul li a {
    padding: 5px 10px;
    font-size: 0.82rem;
  }

  header form {
    flex-basis: 100%;
    margin-left: 0;
  }

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

  header form input[type="search"]:focus {
    width: auto;
  }

  body > nav[aria-label="面包屑导航"] {
    padding: 0 16px;
    margin-top: 14px;
  }

  main {
    padding: 0 16px 30px;
  }

  main section {
    padding: 22px 18px;
    border-radius: var(--mango-radius);
    margin: 20px 0;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

  #hero {
    padding: 26px 20px;
  }

  main > nav[aria-label="页内锚点导航"] {
    padding: 12px 14px;
  }

  main > nav[aria-label="页内锚点导航"] ul li a {
    padding: 5px 11px;
    font-size: 0.8rem;
  }

  #articles article {
    padding: 18px;
  }

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

  footer {
    padding: 28px 16px 20px;
  }

  footer section {
    padding: 16px 18px;
  }
}

@media (max-width: 380px) {
  header nav ul li a {
    font-size: 0.76rem;
    padding: 4px 8px;
  }
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--mango-primary), var(--mango-secondary));
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--mango-primary-dark);
  background-clip: padding-box;
}

::selection {
  background: rgba(255, 107, 26, 0.28);
  color: var(--mango-text);
}