:root {
  --primary: #8a2b5f;
  --primary-light: #c96a9a;
  --primary-soft: #e3a8c6;
  --accent: #2f5d50;
  --accent-light: #4d8a72;
  --accent-soft: #a8d5c2;
  --bg: #fdf6f9;
  --bg-alt: #ffffff;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --text: #2a1f26;
  --text-soft: #6b5562;
  --text-muted: #9a8492;
  --border: rgba(138, 43, 95, 0.14);
  --border-strong: rgba(138, 43, 95, 0.28);
  --shadow-sm: 0 2px 8px rgba(138, 43, 95, 0.06);
  --shadow-md: 0 8px 28px rgba(138, 43, 95, 0.1);
  --shadow-lg: 0 18px 48px rgba(138, 43, 95, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #8a2b5f 0%, #b8477e 45%, #d98bb4 100%);
  --gradient-accent: linear-gradient(135deg, #2f5d50 0%, #4d8a72 60%, #a8d5c2 100%);
  --gradient-soft: linear-gradient(135deg, rgba(138, 43, 95, 0.08), rgba(201, 106, 154, 0.14));
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 76px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] {
  --primary: #e07aae;
  --primary-light: #f0a8cb;
  --primary-soft: #6d2a4c;
  --accent: #6fc2a0;
  --accent-light: #94d9bc;
  --accent-soft: #234a3d;
  --bg: #14101a;
  --bg-alt: #1c1622;
  --bg-elevated: rgba(36, 28, 44, 0.72);
  --text: #f2e9ef;
  --text-soft: #c3b2be;
  --text-muted: #8f7d8a;
  --border: rgba(224, 122, 174, 0.18);
  --border-strong: rgba(224, 122, 174, 0.34);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  --gradient-hero: linear-gradient(135deg, #4a1733 0%, #7a2c55 45%, #a34a78 100%);
  --gradient-accent: linear-gradient(135deg, #1b3a31 0%, #2f5d50 60%, #4d8a72 100%);
  --gradient-soft: linear-gradient(135deg, rgba(224, 122, 174, 0.1), rgba(111, 194, 160, 0.1));
}

*,
*::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: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(201, 106, 154, 0.16), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(77, 138, 114, 0.12), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

[data-theme="dark"] body {
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(224, 122, 174, 0.14), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(111, 194, 160, 0.1), transparent 55%),
    var(--bg);
}

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

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

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

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

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

h1 { font-size: clamp(1.7rem, 3.6vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.3rem); }

p { margin: 0 0 1em; }

ul, ol { padding-left: 1.3em; }

li { margin-bottom: 0.4em; }

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

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-elevated);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 0;
}

.brand svg {
  flex-shrink: 0;
  filter: drop-shadow(0 4px 10px rgba(138, 43, 95, 0.28));
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-8deg) scale(1.06);
}

.brand-name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  white-space: nowrap;
}

#main-nav {
  margin-left: auto;
}

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

#main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--text-soft);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

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

#main-nav a:hover::after {
  transform: scaleX(1);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

#site-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(201, 106, 154, 0.16);
}

#search-input {
  border: none;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.86rem;
  color: var(--text);
  width: 190px;
  font-family: inherit;
}

#search-input::placeholder { color: var(--text-muted); }

#search-input:focus { outline: none; }

#site-search button {
  border: none;
  background: var(--gradient-hero);
  color: #fff;
  padding: 9px 16px;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: filter var(--transition), opacity var(--transition);
}

#site-search button:hover { filter: brightness(1.1); }

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  font-size: 1.05rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px) rotate(8deg);
  border-color: var(--primary-light);
  background: var(--gradient-soft);
}

#menu-toggle { display: none; }

/* ============ Main / Layout ============ */
main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 24px 64px;
  display: block;
}

main > section {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 44px);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

main > section::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity var(--transition);
}

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

main > section:hover::before { opacity: 1; }

main > section > h2:first-child {
  margin-top: 0;
  padding-bottom: 14px;
  position: relative;
}

main > section > h2:first-child::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-hero);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  margin-bottom: 20px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 10px 18px;
  background: var(--bg-elevated);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.84rem;
  color: var(--text-muted);
  width: fit-content;
}

.breadcrumb li { margin: 0; display: flex; align-items: center; gap: 8px; }

.breadcrumb li + li::before {
  content: "›";
  color: var(--text-muted);
  font-size: 1rem;
}

.breadcrumb a { color: var(--text-soft); }
.breadcrumb a:hover { color: var(--primary); }

/* ============ Hero ============ */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: clamp(24px, 4vw, 48px);
  margin-bottom: 32px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0.6;
  pointer-events: none;
}

.hero-slider {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 2 / 1;
  background: var(--gradient-hero);
  z-index: 1;
}

.hero-slider .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero-slider .slide.active {
  opacity: 1;
  transform: scale(1);
  position: relative;
}

.hero-slider .slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  margin-top: 0;
  background: linear-gradient(120deg, var(--primary) 0%, var(--primary-light) 55%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-lead {
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  color: var(--text-soft);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 26px 0 30px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.btn-primary {
  background: var(--gradient-hero);
  color: #fff;
  box-shadow: 0 10px 24px rgba(138, 43, 95, 0.32);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(138, 43, 95, 0.42);
  filter: brightness(1.06);
}

.btn-secondary {
  background: var(--bg-elevated);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--primary);
  border: 1.5px solid var(--border-strong);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  color: var(--primary);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero-stats li {
  margin: 0;
  padding: 14px 10px;
  text-align: center;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.hero-stats li:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.hero-stats .num {
  display: block;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
}

.hero-stats small {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============ TOC ============ */
#toc {
  background: var(--bg-elevated);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px clamp(20px, 3vw, 32px);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

#toc h2 {
  margin: 0 0 14px;
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--text-soft);
  text-transform: uppercase;
}

#toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

#toc li { margin: 0; }

#toc a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.84rem;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-soft);
  transition: all var(--transition);
}

#toc a:hover {
  background: var(--gradient-hero);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(138, 43, 95, 0.28);
}

/* ============ Content typography ============ */
main > section h3 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  padding-left: 14px;
  border-left: 4px solid var(--primary-light);
  color: var(--text);
}

main > section ul,
main > section ol {
  color: var(--text-soft);
}

main > section li::marker {
  color: var(--primary-light);
}

/* ============ Articles / News cards ============ */
#news article,
#articles article {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-hero);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#news article:hover::before,
#articles article:hover::before {
  transform: scaleY(1);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  padding-left: 0;
  border-left: none;
}

#articles article h3 a {
  color: var(--text);
  transition: color var(--transition);
}

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

#news time,
#articles time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--gradient-soft);
  margin-bottom: 8px;
}

#articles article > a:last-child {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.86rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

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

#articles article > a:last-child:hover {
  background: var(--gradient-hero);
  color: #fff;
  border-color: transparent;
}

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

/* ============ Reviews ============ */
#reviews blockquote {
  margin: 0 0 16px;
  padding: 22px 26px 22px 56px;
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-style: normal;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#reviews blockquote::before {
  content: "“";
  position: absolute;
  left: 16px;
  top: 2px;
  font-size: 3.4rem;
  line-height: 1;
  color: var(--primary-soft);
  font-family: Georgia, serif;
  opacity: 0.7;
}

#reviews blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#reviews blockquote p { margin: 0; }

/* ============ FAQ ============ */
#faq details {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

#faq summary {
  cursor: pointer;
  padding: 16px 52px 16px 22px;
  font-weight: 600;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition), color var(--transition);
  line-height: 1;
}

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

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

#faq details p {
  margin: 0;
  padding: 0 22px 20px;
  color: var(--text-soft);
  animation: fadeSlide 0.4s ease;
}

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

/* ============ Contact / address ============ */
#contact address {
  font-style: normal;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 20px 0 26px;
  position: relative;
  overflow: hidden;
}

#contact address::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--gradient-accent);
}

#contact address p { margin: 0 0 8px; color: var(--text-soft); }
#contact address p:last-child { margin-bottom: 0; }

/* ============ Sitemap / links ============ */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.86rem;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-soft);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(47, 93, 80, 0.28);
}

/* ============ Footer ============ */
#site-footer {
  background: linear-gradient(160deg, #2a1a24 0%, #3d2333 55%, #2f3a35 100%);
  color: #e9dde4;
  margin-top: 24px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 90% 0%, rgba(201, 106, 154, 0.24), transparent 60%),
    radial-gradient(500px 260px at 5% 100%, rgba(77, 138, 114, 0.2), transparent 60%);
  pointer-events: none;
}

.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 36px;
  position: relative;
  z-index: 1;
}

#site-footer section { min-width: 0; }

#site-footer h2 {
  font-size: 1rem;
  margin: 0 0 14px;
  padding-bottom: 10px;
  position: relative;
  color: #fff;
  letter-spacing: 0.04em;
}

#site-footer h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, #c96a9a, #a8d5c2);
}

#site-footer h3 {
  font-size: 0.88rem;
  margin: 16px 0 6px;
  color: #f0c8dd;
  padding-left: 0;
  border-left: none;
}

#site-footer p {
  margin: 0 0 8px;
  font-size: 0.86rem;
  color: #c9b8c2;
  line-height: 1.7;
}

#site-footer a { color: #f0a8cb; }
#site-footer a:hover { color: #fff; }

.copyright {
  grid-column: 1 / -1;
  margin: 12px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.8rem;
  color: #a8949f;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-hero);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(138, 43, 95, 0.4);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), filter var(--transition);
  z-index: 90;
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  filter: brightness(1.1);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .header-inner { gap: 16px; }
  #search-input { width: 150px; }
  #main-nav a { padding: 8px 9px; font-size: 0.85rem; }
}

@media (max-width: 960px) {
  :root { --header-h: 68px; }

  .header-inner {
    padding: 0 18px;
    flex-wrap: nowrap;
    justify-content: space-between;
  }

  .brand-sub { display: none; }

  #main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    backdrop-filter: blur(20px) saturate(160%);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 12px 18px 20px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    margin-left: 0;
  }

  #main-nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  #main-nav a {
    padding: 12px 14px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  #main-nav a::after { display: none; }

  #menu-toggle { display: grid; }

  #site-search { display: none; }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-slider { order: -1; }
}

@media (max-width: 720px) {
  body { font-size: 15px; }

  main { padding: 20px 14px 48px; }

  main > section {
    padding: 22px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 22px;
  }

  .hero {
    padding: 22px 18px;
    border-radius: var(--radius-lg);
    gap: 22px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    flex: 1 1 100%;
  }

  #toc { padding: 18px 16px; }

  #toc ul { gap: 6px; }
  #toc a { padding: 5px 11px; font-size: 0.8rem; }

  .breadcrumb ol { font-size: 0.78rem; padding: 8px 14px; }

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

  #reviews blockquote { padding: 20px 20px 20px 46px; }

  #contact address { padding: 18px 20px; }

  .footer-inner {
    padding: 40px 18px 24px;
    gap: 28px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 420px) {
  .brand-name { font-size: 1rem; }
  .brand svg { width: 34px; height: 34px; }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .hero-stats li { padding: 12px 6px; }
  .hero-stats small { font-size: 0.68rem; }
  #faq summary { padding: 14px 46px 14px 16px; font-size: 0.92rem; }
  #faq details p { padding: 0 16px 16px; }
}

/* ============ Print ============ */
@media print {
  #site-header,
  #back-to-top,
  #toc,
  #site-footer,
  .hero-actions,
  .header-tools { display: none !important; }
  body { background: #fff; color: #000; }
  main > section { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
  a { color: #000; text-decoration: underline; }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>