:root {
  --bg: #F7F8FA;
  --bg-alt: #FFFFFF;
  --card: rgba(255, 255, 255, 0.72);
  --card-solid: #FFFFFF;
  --border: #E2E6ED;
  --border-glass: rgba(255, 255, 255, 0.55);
  --text: #17202A;
  --text-strong: #0B1220;
  --text-muted: #48566B;
  --brand: #B91C1C;
  --brand-dark: #7F1010;
  --brand-soft: #FDECEC;
  --brand-glow: rgba(185, 28, 28, 0.28);
  --link: #8A1414;
  --nav-bg: rgba(255, 255, 255, 0.78);
  --nav-text: #17202A;
  --footer-bg: #141A24;
  --footer-text: #E5E7EB;
  --footer-muted: #B7C0CC;
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 48px rgba(15, 23, 42, 0.16);
  --shadow-glass: 0 8px 32px rgba(15, 23, 42, 0.12);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --gradient-hero: linear-gradient(135deg, #7F1010 0%, #B91C1C 48%, #E05656 100%);
  --gradient-brand: linear-gradient(135deg, #B91C1C 0%, #E05656 100%);
  --gradient-soft: linear-gradient(135deg, rgba(185, 28, 28, 0.08) 0%, rgba(224, 86, 86, 0.04) 100%);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #0B1017;
  --bg-alt: #111823;
  --card: rgba(20, 28, 40, 0.72);
  --card-solid: #141C28;
  --border: #26313F;
  --border-glass: rgba(255, 255, 255, 0.08);
  --text: #E5E7EB;
  --text-strong: #F8FAFC;
  --text-muted: #AEB9C7;
  --brand: #F87171;
  --brand-dark: #FCA5A5;
  --brand-soft: #2A1414;
  --brand-glow: rgba(248, 113, 113, 0.22);
  --link: #FCA5A5;
  --nav-bg: rgba(17, 24, 35, 0.78);
  --nav-text: #F1F5F9;
  --footer-bg: #070B11;
  --footer-text: #E5E7EB;
  --footer-muted: #AEB9C7;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.55);
  --gradient-hero: linear-gradient(135deg, #450A0A 0%, #7F1010 52%, #B91C1C 100%);
  --gradient-brand: linear-gradient(135deg, #F87171 0%, #B91C1C 100%);
  --gradient-soft: linear-gradient(135deg, rgba(248, 113, 113, 0.1) 0%, rgba(185, 28, 28, 0.04) 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 16px;
  overflow-x: hidden;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(680px 420px at 12% -6%, rgba(185, 28, 28, 0.1), transparent 62%),
    radial-gradient(560px 380px at 92% 4%, rgba(224, 86, 86, 0.08), transparent 60%),
    radial-gradient(720px 520px at 50% 108%, rgba(127, 16, 16, 0.07), transparent 64%);
}

html[data-theme="dark"] body::before {
  background:
    radial-gradient(680px 420px at 12% -6%, rgba(248, 113, 113, 0.12), transparent 62%),
    radial-gradient(560px 380px at 92% 4%, rgba(185, 28, 28, 0.16), transparent 60%),
    radial-gradient(720px 520px at 50% 108%, rgba(248, 113, 113, 0.08), transparent 64%);
}

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

svg {
  display: block;
}

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

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

h1, h2, h3, h4 {
  color: var(--text-strong);
  line-height: 1.4;
  margin: 0 0 14px;
  letter-spacing: 0.01em;
  scroll-margin-top: 90px;
}

h1 {
  font-size: 2.05rem;
  font-weight: 800;
}

h2 {
  font-size: 1.52rem;
  font-weight: 800;
  position: relative;
  padding-left: 16px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: 4px;
  background: var(--gradient-brand);
  box-shadow: 0 0 14px var(--brand-glow);
}

h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

p {
  margin: 0 0 14px;
  color: var(--text);
}

ul, ol {
  padding-left: 22px;
  color: var(--text);
  margin: 0 0 16px;
}

li {
  margin-bottom: 8px;
}

li::marker {
  color: var(--brand);
  font-weight: 700;
}

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

.muted {
  color: var(--text-muted);
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 18px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  background: var(--brand);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection {
  background: var(--brand);
  color: #fff;
}

/* ===== Header ===== */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.16rem;
  color: var(--text-strong);
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
  color: var(--text-strong);
}

.brand svg {
  flex: 0 0 auto;
  border-radius: 10px;
  box-shadow: 0 4px 14px var(--brand-glow);
  transition: transform 0.4s var(--ease);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

nav.main-nav ul {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav.main-nav a {
  position: relative;
  color: var(--nav-text);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 2px;
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

nav.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s var(--ease);
}

nav.main-nav a:hover,
nav.main-nav a:focus-visible {
  color: var(--brand);
  text-decoration: none;
}

nav.main-nav a:hover::after,
nav.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

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

.search-box {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 5px 4px 14px;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text);
  width: 132px;
  font-size: 0.9rem;
  padding: 4px 0;
  font-family: inherit;
}

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

.search-box button {
  border: none;
  background: var(--gradient-brand);
  color: #fff;
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  font-family: inherit;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), filter 0.25s var(--ease);
}

.search-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--brand-glow);
  filter: brightness(1.06);
}

.theme-btn,
.menu-btn {
  background: var(--card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--text-strong);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  font-family: inherit;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.theme-btn:hover,
.menu-btn:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: 0 8px 20px var(--brand-glow);
}

.menu-btn {
  display: none;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 62px 0 56px;
  color: #fff;
  background: var(--gradient-hero);
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 130%;
  background:
    radial-gradient(circle at 18% 22%, rgba(255, 255, 255, 0.22), transparent 48%),
    radial-gradient(circle at 82% 12%, rgba(255, 255, 255, 0.16), transparent 46%),
    radial-gradient(circle at 62% 92%, rgba(0, 0, 0, 0.22), transparent 52%);
  z-index: -1;
  animation: heroFloat 14s ease-in-out infinite alternate;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(circle at 50% 40%, #000 10%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 40%, #000 10%, transparent 78%);
  opacity: 0.7;
}

@keyframes heroFloat {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(0, -18px, 0) scale(1.04); }
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero h1 {
  color: #FFFFFF;
  max-width: 860px;
  text-shadow: 0 3px 18px rgba(0, 0, 0, 0.34);
  animation: fadeUp 0.8s var(--ease) both;
}

.hero p {
  color: #FDF2F2;
  font-size: 1.05rem;
  max-width: 780px;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
  animation: fadeUp 0.8s 0.1s var(--ease) both;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  animation: fadeUp 0.8s 0.2s var(--ease) both;
}

.hero-tags span {
  background: rgba(255, 255, 255, 0.16);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: #FFFFFF;
  padding: 6px 15px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
  transition: transform 0.28s var(--ease), background 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.hero-tags span:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.3);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.24);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Breadcrumb & anchors ===== */
.breadcrumb {
  font-size: 0.86rem;
  color: var(--text-muted);
  padding: 14px 18px;
  word-break: break-word;
}

.breadcrumb a {
  color: var(--link);
}

.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px auto 4px;
}

.anchor-nav a {
  background: var(--card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 15px;
  color: var(--text-strong);
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  transition: transform 0.28s var(--ease), background 0.28s var(--ease), color 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.anchor-nav a:hover,
.anchor-nav a:focus-visible {
  transform: translateY(-3px);
  background: var(--brand-soft);
  border-color: var(--brand);
  color: var(--brand-dark);
  text-decoration: none;
  box-shadow: 0 10px 22px var(--brand-glow);
}

html[data-theme="dark"] .anchor-nav a:hover,
html[data-theme="dark"] .anchor-nav a:focus-visible {
  color: #FCA5A5;
}

/* ===== Sections ===== */
.section {
  position: relative;
  padding: 52px 0;
}

.section.alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.section > .container {
  position: relative;
  z-index: 1;
}

/* ===== Grids ===== */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ===== Cards ===== */
.card {
  position: relative;
  background: var(--card);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.42s var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  color: var(--text-strong);
  transition: color 0.28s var(--ease);
}

.card:hover h3 {
  color: var(--brand);
}

.card p {
  color: var(--text);
}

.card p:last-child {
  margin-bottom: 0;
}

/* ===== Stats ===== */
.stat {
  text-align: center;
  padding: 28px 14px;
}

.stat .num {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  letter-spacing: 0.01em;
}

.stat .label {
  color: var(--text-muted);
  font-weight: 700;
  margin-top: 8px;
  font-size: 0.92rem;
}

/* ===== Article cards ===== */
.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-card .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.article-card h3 {
  font-size: 1.08rem;
  margin-bottom: 10px;
}

.article-card p {
  font-size: 0.95rem;
  color: var(--text);
}

.article-card a.more {
  margin-top: auto;
  padding-top: 12px;
  color: var(--link);
  font-weight: 700;
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.28s var(--ease), color 0.28s var(--ease);
}

.article-card a.more:hover {
  gap: 10px;
  text-decoration: none;
  color: var(--brand);
}

.badge {
  display: inline-block;
  align-self: flex-start;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 11px;
  border-radius: 999px;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: background 0.28s var(--ease), border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.card:hover .badge {
  transform: translateX(2px);
  border-color: var(--brand);
}

html[data-theme="dark"] .badge {
  color: #FCA5A5;
}

/* ===== FAQ ===== */
.faq-item {
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 12px;
  background: var(--card);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.faq-item:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow);
}

.faq-item.open {
  border-color: var(--brand);
  box-shadow: 0 12px 30px var(--brand-glow);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 17px 18px;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  color: var(--text-strong);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  transition: background 0.28s var(--ease), color 0.28s var(--ease);
}

.faq-q:hover {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

html[data-theme="dark"] .faq-q:hover {
  color: #FCA5A5;
}

.faq-icon {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--brand-soft);
  color: var(--brand);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1;
  transition: transform 0.32s var(--ease), background 0.32s var(--ease), color 0.32s var(--ease);
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
  background: var(--gradient-brand);
  color: #fff;
}

.faq-a {
  display: none;
  padding: 14px 18px 18px;
  color: var(--text);
  border-top: 1px solid var(--border);
  animation: faqIn 0.34s var(--ease) both;
}

.faq-item.open .faq-a {
  display: block;
}

.faq-a p:last-child {
  margin-bottom: 0;
}

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

/* ===== Tables ===== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.94rem;
  background: var(--card-solid);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

th, td {
  border: 1px solid var(--border);
  padding: 11px 13px;
  text-align: left;
  color: var(--text);
  vertical-align: top;
}

th {
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 800;
  white-space: nowrap;
}

tbody tr {
  transition: background 0.25s var(--ease);
}

tbody tr:hover {
  background: var(--gradient-soft);
}

html[data-theme="dark"] th {
  color: #FCA5A5;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.contact-item {
  background: var(--card);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px 16px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.contact-item:hover {
  transform: translateY(-4px);
  border-color: var(--brand);
  box-shadow: 0 12px 26px var(--brand-glow);
}

.contact-item strong {
  color: var(--text-strong);
  display: block;
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.contact-item span {
  color: var(--text);
  font-size: 0.95rem;
  word-break: break-word;
}

/* ===== Notice ===== */
.notice {
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  padding: 15px 18px;
  border-radius: 10px;
  color: var(--text);
}

html[data-theme="dark"] .notice {
  color: #F3D6D6;
}

/* ===== Footer ===== */
footer.site-footer {
  position: relative;
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 50px 0 22px;
  margin-top: 24px;
  overflow: hidden;
}

footer.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-brand);
}

footer.site-footer::after {
  content: "";
  position: absolute;
  inset: auto -10% -60% -10%;
  height: 60%;
  background: radial-gradient(circle at 50% 0%, rgba(185, 28, 28, 0.28), transparent 62%);
  pointer-events: none;
}

footer.site-footer .container {
  position: relative;
  z-index: 1;
}

footer.site-footer h4 {
  color: #FFFFFF;
  margin-bottom: 12px;
  font-size: 1rem;
}

footer.site-footer a {
  color: #FCA5A5;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

footer.site-footer a:hover {
  color: #FFFFFF;
  text-decoration: none;
  padding-left: 4px;
}

footer.site-footer p,
footer.site-footer li {
  color: var(--footer-text);
  font-size: 0.93rem;
}

footer.site-footer ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

footer.site-footer li {
  margin-bottom: 8px;
}

.footer-muted {
  color: var(--footer-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 26px;
}

.footer-bottom {
  border-top: 1px solid #2A3442;
  margin-top: 30px;
  padding-top: 18px;
  font-size: 0.85rem;
  color: var(--footer-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== Back to top ===== */
#backTop {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 10px 26px var(--brand-glow);
  display: none;
  z-index: 600;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), filter 0.3s var(--ease);
}

#backTop.show {
  display: block;
  animation: popIn 0.36s var(--ease) both;
}

#backTop:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 34px var(--brand-glow);
  filter: brightness(1.08);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.6); }
  to { opacity: 1; transform: scale(1); }
}

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  nav.main-nav ul { gap: 14px; }
  nav.main-nav a { font-size: 0.9rem; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 76px; }

  .nav-wrap {
    flex-wrap: wrap;
    gap: 10px;
  }

  nav.main-nav {
    display: none;
    order: 3;
    flex-basis: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    backdrop-filter: blur(18px) saturate(180%);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 16px 18px;
    animation: navDrop 0.3s var(--ease) both;
  }

  nav.main-nav.open {
    display: block;
  }

  nav.main-nav ul {
    flex-direction: column;
    gap: 6px;
  }

  nav.main-nav a {
    display: block;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.98rem;
  }

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

  nav.main-nav a:hover,
  nav.main-nav a:focus-visible {
    background: var(--brand-soft);
  }

  .menu-btn { display: inline-block; }

  .search-box input { width: 104px; }

  .hero { padding: 48px 0 42px; }

  .section { padding: 42px 0; }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  body { font-size: 15.5px; }

  h1 { font-size: 1.58rem; }
  h2 { font-size: 1.28rem; }
  h3 { font-size: 1.08rem; }

  .grid-2,
  .grid-3,
  .grid-4,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding: 42px 0 36px; }
  .hero p { font-size: 1rem; }

  .section { padding: 36px 0; }

  .card { padding: 18px; }

  .stat .num { font-size: 1.9rem; }

  .search-box input { width: 88px; }

  .theme-btn,
  .menu-btn {
    padding: 6px 11px;
    font-size: 0.8rem;
  }

  .brand { font-size: 1.02rem; }

  #backTop {
    right: 16px;
    bottom: 18px;
    width: 44px;
    height: 44px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 6px;
    text-align: left;
  }
}

@media (max-width: 380px) {
  .search-box { display: none; }
}

/* ===== Motion preferences ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== Print ===== */
@media print {
  header.site-header,
  #backTop,
  .anchor-nav,
  .hero-tags,
  footer.site-footer {
    display: none !important;
  }

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

  .card,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
  }
}