:root {
  --brand: #E8500A;
  --brand-dark: #C43E05;
  --brand-light: #FF7A3D;
  --accent: #F59E0B;
  --accent-deep: #B45309;
  --bg: #FFF8F3;
  --bg-alt: #FFF3E8;
  --surface: #FFFFFF;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-strong: rgba(255, 255, 255, 0.88);
  --border: rgba(232, 80, 10, 0.14);
  --border-soft: rgba(0, 0, 0, 0.07);
  --text: #2B1B12;
  --text-soft: #6B5245;
  --text-mute: #9A8275;
  --shadow-sm: 0 2px 8px rgba(120, 60, 20, 0.06);
  --shadow-md: 0 8px 28px rgba(120, 60, 20, 0.1);
  --shadow-lg: 0 18px 48px rgba(120, 60, 20, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --grad-brand: linear-gradient(135deg, #E8500A 0%, #F59E0B 55%, #FFB347 100%);
  --grad-hero: linear-gradient(135deg, #FFE3CC 0%, #FFD1A8 40%, #FFC98A 100%);
  --grad-card: linear-gradient(160deg, rgba(255, 255, 255, 0.95), rgba(255, 243, 232, 0.9));
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --maxw: 1180px;
  --header-h: 72px;
  color-scheme: light;
}

html[data-theme="dark"],
body.dark-mode,
.dark {
  --bg: #14100D;
  --bg-alt: #1B1511;
  --surface: #221A15;
  --surface-glass: rgba(34, 26, 21, 0.72);
  --surface-glass-strong: rgba(34, 26, 21, 0.9);
  --border: rgba(245, 158, 11, 0.2);
  --border-soft: rgba(255, 255, 255, 0.08);
  --text: #F5EBE3;
  --text-soft: #C9B5A6;
  --text-mute: #94806F;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --grad-hero: linear-gradient(135deg, #3A1F0E 0%, #4A260F 45%, #5C2E10 100%);
  --grad-card: linear-gradient(160deg, rgba(40, 30, 24, 0.95), rgba(30, 22, 17, 0.9));
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14100D;
    --bg-alt: #1B1511;
    --surface: #221A15;
    --surface-glass: rgba(34, 26, 21, 0.72);
    --surface-glass-strong: rgba(34, 26, 21, 0.9);
    --border: rgba(245, 158, 11, 0.2);
    --border-soft: rgba(255, 255, 255, 0.08);
    --text: #F5EBE3;
    --text-soft: #C9B5A6;
    --text-mute: #94806F;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --grad-hero: linear-gradient(135deg, #3A1F0E 0%, #4A260F 45%, #5C2E10 100%);
    --grad-card: linear-gradient(160deg, rgba(40, 30, 24, 0.95), rgba(30, 22, 17, 0.9));
    color-scheme: dark;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(232, 80, 10, 0.08), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(245, 158, 11, 0.09), transparent 40%);
  background-attachment: fixed;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

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

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  color: var(--text);
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  position: relative;
  padding-left: 18px;
}

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

h3 {
  font-size: clamp(1.08rem, 1.6vw, 1.28rem);
  color: var(--text);
}

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

ul, ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.45em;
}

li::marker {
  color: var(--brand);
}

blockquote {
  margin: 0 0 1.2em;
  padding: 18px 22px;
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

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

hr {
  border: none;
  height: 1px;
  background: var(--border-soft);
  margin: 2em 0;
}

::selection {
  background: rgba(232, 80, 10, 0.22);
  color: var(--text);
}

:focus-visible {
  outline: 3px solid rgba(232, 80, 10, 0.55);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip link */
body > a[href="#main-content"] {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 999;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  color: #fff;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  transition: top 0.3s var(--ease);
}

body > a[href="#main-content"]:focus {
  top: 16px;
  color: #fff;
  text-decoration: none;
}

/* ============ Header ============ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

header > div {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  min-height: var(--header-h);
}

header > div > a[aria-label] {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

header > div > a[aria-label] svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(232, 80, 10, 0.35);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

header > div > a[aria-label]:hover svg {
  transform: rotate(-8deg) scale(1.06);
  box-shadow: 0 6px 20px rgba(232, 80, 10, 0.5);
}

header > div > a[aria-label]:hover {
  text-decoration: none;
  color: var(--brand);
}

/* Nav */
header nav[aria-label="主导航"] {
  flex: 1 1 auto;
  min-width: 0;
}

header nav[aria-label="主导航"] ul {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
}

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

header nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

header nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  transform: translateX(-50%);
  transition: width 0.3s var(--ease);
}

header nav[aria-label="主导航"] a:hover,
header nav[aria-label="主导航"] a:focus-visible {
  color: var(--brand);
  background: rgba(232, 80, 10, 0.08);
  text-decoration: none;
  transform: translateY(-1px);
}

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

/* Search */
header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 4px 4px 4px 16px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
  flex-shrink: 0;
}

header form[role="search"]:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(232, 80, 10, 0.14), var(--shadow-md);
}

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

header form[role="search"] input[type="search"] {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  width: 180px;
  padding: 6px 4px;
  font-family: inherit;
}

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

header form[role="search"] button {
  border: none;
  cursor: pointer;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), filter 0.25s var(--ease);
}

header form[role="search"] button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(232, 80, 10, 0.4);
  filter: brightness(1.05);
}

header form[role="search"] button:active {
  transform: translateY(0);
}

/* Header buttons */
header > div > button {
  border: 1px solid var(--border);
  background: var(--surface-glass-strong);
  color: var(--text-soft);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.25s var(--ease);
  flex-shrink: 0;
}

header > div > button:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: rgba(232, 80, 10, 0.08);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

header > div > button[aria-label="打开移动菜单"] {
  display: none;
}

/* ============ Breadcrumb ============ */
body > nav[aria-label="面包屑导航"] {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px 0;
}

body > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-mute);
}

body > nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

body > nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  color: var(--text-mute);
  font-size: 1rem;
  line-height: 1;
}

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

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

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

/* ============ Main layout ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

main > section {
  background: var(--grad-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.4s var(--ease), transform 0.4s var(--ease), border-color 0.4s var(--ease);
  animation: fadeUp 0.7s var(--ease) both;
}

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

main > section::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12), transparent 70%);
  pointer-events: none;
}

main > section:nth-child(2) { animation-delay: 0.05s; }
main > section:nth-child(3) { animation-delay: 0.1s; }
main > section:nth-child(4) { animation-delay: 0.15s; }
main > section:nth-child(5) { animation-delay: 0.2s; }
main > section:nth-child(6) { animation-delay: 0.25s; }
main > section:nth-child(7) { animation-delay: 0.3s; }
main > section:nth-child(8) { animation-delay: 0.35s; }
main > section:nth-child(9) { animation-delay: 0.4s; }
main > section:nth-child(10) { animation-delay: 0.45s; }
main > section:nth-child(11) { animation-delay: 0.5s; }
main > section:nth-child(12) { animation-delay: 0.55s; }
main > section:nth-child(13) { animation-delay: 0.6s; }

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

@keyframes floatIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============ Hero ============ */
main > section:first-of-type {
  background: var(--grad-hero);
  border: none;
  padding: 52px 44px;
  isolation: isolate;
}

main > section:first-of-type::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgba(232, 80, 10, 0.22), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(245, 158, 11, 0.18), transparent 50%);
  z-index: -1;
}

main > section:first-of-type::after {
  width: 320px;
  height: 320px;
  top: -120px;
  right: -100px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.4), transparent 70%);
}

main > section:first-of-type h1 {
  max-width: 900px;
  background: linear-gradient(120deg, var(--brand-dark), var(--brand) 45%, var(--accent-deep));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 20px;
}

html[data-theme="dark"] main > section:first-of-type h1,
body.dark-mode main > section:first-of-type h1 {
  background: linear-gradient(120deg, #FFB347, #FF7A3D 50%, #F59E0B);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

main > section:first-of-type > p {
  max-width: 880px;
  font-size: 1.02rem;
  color: var(--text-soft);
}

main > section:first-of-type > div {
  margin: 28px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}

main > section:first-of-type > div:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: 0 26px 60px rgba(120, 60, 20, 0.22);
}

main > section:first-of-type > div svg {
  width: 100%;
  height: auto;
  display: block;
}

main > section:first-of-type > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  list-style: none;
  padding: 0;
  margin: 24px 0 28px;
}

main > section:first-of-type > ul li {
  margin: 0;
  padding: 14px 18px 14px 46px;
  position: relative;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-sm);
  font-weight: 500;
  color: var(--text);
  font-size: 0.94rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

main > section:first-of-type > ul li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--grad-brand);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
}

main > section:first-of-type > ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

main > section:first-of-type > p:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 0;
}

main > section:first-of-type > p:last-child a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s var(--ease);
}

main > section:first-of-type > p:last-child a:first-child {
  background: var(--grad-brand);
  color: #fff;
  box-shadow: 0 8px 22px rgba(232, 80, 10, 0.35);
}

main > section:first-of-type > p:last-child a:first-child:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(232, 80, 10, 0.45);
  text-decoration: none;
  color: #fff;
}

main > section:first-of-type > p:last-child a:last-child {
  background: var(--surface-glass-strong);
  color: var(--brand);
  border: 1px solid var(--border);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

main > section:first-of-type > p:last-child a:last-child:hover {
  background: var(--surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

/* ============ Cards: news / articles ============ */
main > section ul > li {
  list-style: none;
}

main > section#news ul,
main > section#articles,
main > section#cases {
  display: grid;
  gap: 18px;
}

main > section#news ul {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  padding: 0;
  margin: 0;
}

main > section#news ul > li {
  margin: 0;
  padding: 22px 24px;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

main > section#news ul > li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--grad-brand);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s var(--ease);
}

main > section#news ul > li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}

main > section#news ul > li:hover::before {
  transform: scaleY(1);
}

main > section#news ul > li h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text);
}

main > section#news ul > li p {
  font-size: 0.9rem;
  margin-bottom: 6px;
}

main > section#news ul > li p:first-of-type {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--brand);
  background: rgba(232, 80, 10, 0.09);
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  margin-bottom: 10px;
}

main > section#news ul > li p:last-child {
  margin-bottom: 0;
  color: var(--text-soft);
}

main > section#articles {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

main > section#articles > p:first-of-type {
  grid-column: 1 / -1;
}

main > section#articles article {
  padding: 24px 26px;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

main > section#articles article::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(232, 80, 10, 0.06), transparent 55%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}

main > section#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}

main > section#articles article:hover::after {
  opacity: 1;
}

main > section#articles article h3 {
  font-size: 1.06rem;
  margin-bottom: 10px;
  transition: color 0.3s var(--ease);
}

main > section#articles article:hover h3 {
  color: var(--brand);
}

main > section#articles article p {
  font-size: 0.9rem;
  margin-bottom: 10px;
}

main > section#articles article > p:nth-of-type(1) {
  font-size: 0.78rem;
  color: var(--text-mute);
  font-weight: 600;
  letter-spacing: 0.02em;
}

main > section#articles article > p:nth-of-type(2) {
  flex: 1;
  color: var(--text-soft);
}

main > section#articles article > p:last-child {
  margin: 0;
  margin-top: auto;
}

main > section#articles article > p:last-child a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 7px 18px;
  border-radius: var(--radius-pill);
  background: rgba(232, 80, 10, 0.09);
  color: var(--brand);
  transition: all 0.3s var(--ease);
}

main > section#articles article > p:last-child a::after {
  content: "→";
  transition: transform 0.3s var(--ease);
}

main > section#articles article > p:last-child a:hover {
  background: var(--grad-brand);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(232, 80, 10, 0.35);
}

main > section#articles article > p:last-child a:hover::after {
  transform: translateX(4px);
}

/* ============ Cases blockquotes ============ */
main > section#cases blockquote {
  margin: 0;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-left-width: 4px;
  border-radius: var(--radius-md);
}

main > section#cases blockquote p {
  font-style: normal;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ============ FAQ details ============ */
main > section#faq details {
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

main > section#faq details:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
}

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

main > section#faq summary {
  cursor: pointer;
  padding: 18px 52px 18px 22px;
  font-weight: 600;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
  border-radius: var(--radius-md);
}

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

main > section#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(232, 80, 10, 0.1);
  color: var(--brand);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), color 0.35s var(--ease);
}

main > section#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--grad-brand);
  color: #fff;
}

main > section#faq summary:hover {
  color: var(--brand);
  background: rgba(232, 80, 10, 0.04);
}

main > section#faq details p {
  padding: 0 22px 20px;
  margin: 0;
  font-size: 0.93rem;
  animation: floatIn 0.35s var(--ease);
}

/* ============ HowTo ordered list ============ */
main > section#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
  margin: 0 0 1.4em;
}

main > section#howto ol > li {
  counter-increment: step;
  position: relative;
  padding: 16px 20px 16px 60px;
  margin: 0;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.94rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

main > section#howto ol > li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--grad-brand);
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  box-shadow: 0 4px 12px rgba(232, 80, 10, 0.3);
}

main > section#howto ol > li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

main > section#howto ul {
  display: grid;
  gap: 8px;
  padding: 0;
  list-style: none;
}

main > section#howto ul > li {
  position: relative;
  padding: 10px 16px 10px 34px;
  margin: 0;
  background: rgba(232, 80, 10, 0.05);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  transition: background 0.3s var(--ease);
}

main > section#howto ul > li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}

main > section#howto ul > li:hover {
  background: rgba(232, 80, 10, 0.1);
}

/* ============ Contact / sitemap / friendship lists ============ */
main > section#contact ul,
main > section#sitemap ul,
main > section#friendship ul {
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

main > section#contact ul {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

main > section#contact ul > li {
  margin: 0;
  padding: 14px 18px;
  background: var(--surface-glass-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

main > section#contact ul > li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

main > section#sitemap ul {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

main > section#sitemap ul > li {
  margin: 0;
}

main > section#sitemap a {
  display: block;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background: var(--surface-glass-strong);
  border: 1px solid var(--border-soft);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
  transition: all 0.3s var(--ease);
}

main > section#sitemap a:hover {
  color: #fff;
  background: var(--grad-brand);
  border-color: transparent;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(232, 80, 10, 0.3);
}

main > section#friendship ul > li {
  margin: 0;
}

main > section#friendship a {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--surface-glass-strong);
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s var(--ease);
}

main > section#friendship a:hover {
  background: var(--grad-brand);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(232, 80, 10, 0.35);
  transform: translateY(-2px);
}

/* ============ Footer ============ */
footer {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-top: 1px solid var(--border-soft);
  padding: 48px 24px 32px;
  margin-top: 16px;
}

footer > section {
  max-width: var(--maxw);
  margin: 0 auto 26px;
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

footer > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

footer > section h2 {
  font-size: 1.08rem;
  margin-bottom: 12px;
  padding-left: 16px;
}

footer > section h2::before {
  width: 5px;
}

footer > section p {
  font-size: 0.9rem;
  margin: 0;
  color: var(--text-soft);
}

footer > p {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-mute);
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
}

/* ============ Back to top ============ */
body > button[aria-label="返回顶部"] {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: var(--grad-brand);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.15;
  padding: 6px;
  box-shadow: 0 10px 26px rgba(232, 80, 10, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease),
    box-shadow 0.35s var(--ease), visibility 0.35s var(--ease);
}

body > button[aria-label="返回顶部"]:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 34px rgba(232, 80, 10, 0.55);
}

body > button[aria-label="返回顶部"]:active {
  transform: translateY(-1px) scale(1.02);
}

body > button[aria-label="返回顶部"].is-visible,
body > button[aria-label="返回顶部"]:focus-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* ============ Scroll reveal helper ============ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  main > section {
    animation: none;
  }
}

/* ============ Responsive: tablet ============ */
@media (max-width: 1024px) {
  :root {
    --header-h: 64px;
  }

  header > div {
    gap: 12px;
    padding: 10px 18px;
  }

  header form[role="search"] input[type="search"] {
    width: 130px;
  }

  header nav[aria-label="主导航"] ul {
    gap: 2px;
  }

  header nav[aria-label="主导航"] a {
    padding: 5px 9px;
    font-size: 0.84rem;
  }

  main {
    padding: 20px 18px 52px;
    gap: 22px;
  }

  main > section {
    padding: 30px 28px;
    border-radius: var(--radius-md);
  }

  main > section:first-of-type {
    padding: 40px 30px;
  }
}

/* ============ Responsive: mobile ============ */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  header > div {
    padding: 10px 16px;
    gap: 10px;
    flex-wrap: wrap;
  }

  header > div > a[aria-label] span {
    font-size: 0.98rem;
  }

  header > div > a[aria-label] svg {
    width: 34px;
    height: 34px;
  }

  header > div > button[aria-label="打开移动菜单"] {
    display: inline-block;
    margin-left: auto;
  }

  header > div > button[aria-label="切换暗黑模式"] {
    order: 3;
  }

  header nav[aria-label="主导航"] {
    order: 5;
    flex-basis: 100%;
    display: none;
    padding-top: 8px;
    border-top: 1px solid var(--border-soft);
    margin-top: 4px;
  }

  header nav[aria-label="主导航"].is-open {
    display: block;
    animation: fadeUp 0.35s var(--ease);
  }

  header nav[aria-label="主导航"] ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  header nav[aria-label="主导航"] a {
    display: block;
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
  }

  header nav[aria-label="主导航"] a::after {
    display: none;
  }

  header form[role="search"] {
    order: 4;
    flex-basis: 100%;
    padding: 4px 4px 4px 14px;
  }

  header form[role="search"] input[type="search"] {
    width: 100%;
    flex: 1;
    min-width: 0;
  }

  body > nav[aria-label="面包屑导航"] {
    padding: 12px 16px 0;
    font-size: 0.8rem;
  }

  main {
    padding: 16px 14px 44px;
    gap: 18px;
  }

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

  main > section:first-of-type {
    padding: 30px 20px;
    border-radius: var(--radius-lg);
  }

  main > section:first-of-type h1 {
    font-size: 1.55rem;
    line-height: 1.4;
  }

  main > section:first-of-type > p {
    font-size: 0.94rem;
  }

  main > section:first-of-type > div {
    margin: 20px 0;
    border-radius: var(--radius-md);
  }

  main > section:first-of-type > ul {
    grid-template-columns: 1fr;
    gap: 10px;
    margin: 20px 0 24px;
  }

  main > section:first-of-type > ul li {
    font-size: 0.9rem;
    padding: 12px 16px 12px 44px;
  }

  main > section:first-of-type > p:last-child {
    flex-direction: column;
    gap: 10px;
  }

  main > section:first-of-type > p:last-child a {
    width: 100%;
    padding: 12px 22px;
  }

  h2 {
    font-size: 1.28rem;
    padding-left: 15px;
  }

  h2::before {
    width: 5px;
  }

  h3 {
    font-size: 1.05rem;
  }

  blockquote {
    padding: 14px 16px;
  }

  main > section#news ul,
  main > section#articles {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  main > section#news ul > li,
  main > section#articles article {
    padding: 18px 20px;
  }

  main > section#faq summary {
    padding: 15px 48px 15px 18px;
    font-size: 0.94rem;
  }

  main > section#faq details p {
    padding: 0 18px 18px;
    font-size: 0.9rem;
  }

  main > section#howto ol > li {
    padding: 14px 16px 14px 54px;
    font-size: 0.9rem;
  }

  main > section#howto ol > li::before {
    left: 14px;
    width: 26px;
    height: 26px;
    font-size: 0.8rem;
  }

  main > section#contact ul {
    grid-template-columns: 1fr;
  }

  main > section#sitemap ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  main > section#sitemap a {
    padding: 10px 14px;
    font-size: 0.86rem;
    text-align: center;
  }

  footer {
    padding: 32px 14px 24px;
  }

  footer > section {
    padding: 18px 20px;
    margin-bottom: 16px;
  }

  body > button[aria-label="返回顶部"] {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
    font-size: 0.66rem;
  }
}

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

  main > section:first-of-type h1 {
    font-size: 1.38rem;
  }

  header > div > a[aria-label] span {
    font-size: 0.9rem;
  }
}

/* ============ Print ============ */
@media print {
  header,
  body > nav[aria-label="面包屑导航"],
  body > button[aria-label="返回顶部"],
  body > a[href="#main-content"],
  main > section:first-of-type > div,
  main > section:first-of-type > p:last-child {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

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

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