:root {
  --green-900: #1b5e20;
  --green-800: #2e7d32;
  --green-700: #33691e;
  --green-600: #43a047;
  --green-500: #558b2f;
  --green-300: #a5d6a7;
  --green-100: #c8e6c9;
  --green-50: #dcedc8;
  --lime-200: #fff59d;
  --bg: #f4f8f4;
  --bg-elev: #ffffff;
  --bg-soft: #eaf2ea;
  --text: #1c2620;
  --text-muted: #55665b;
  --border: rgba(46, 125, 50, 0.16);
  --glass: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.55);
  --shadow-sm: 0 2px 8px rgba(27, 94, 32, 0.08);
  --shadow-md: 0 10px 30px rgba(27, 94, 32, 0.12);
  --shadow-lg: 0 20px 50px rgba(27, 94, 32, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --maxw: 1200px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --grad-banner: linear-gradient(135deg, #1b5e20 0%, #2e7d32 45%, #43a047 100%);
  --grad-accent: linear-gradient(135deg, #43a047 0%, #a5d6a7 100%);
  --grad-text: linear-gradient(120deg, #1b5e20 0%, #43a047 60%, #558b2f 100%);
}

html[data-theme="dark"] {
  --bg: #0e1512;
  --bg-elev: #16211b;
  --bg-soft: #1a2a21;
  --text: #e8f2ea;
  --text-muted: #a3b8a9;
  --border: rgba(165, 214, 167, 0.16);
  --glass: rgba(22, 33, 27, 0.6);
  --glass-border: rgba(165, 214, 167, 0.18);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  --grad-banner: linear-gradient(135deg, #0b1f10 0%, #1b5e20 50%, #2e7d32 100%);
  --grad-text: linear-gradient(120deg, #a5d6a7 0%, #dcedc8 50%, #fff59d 100%);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #0e1512;
    --bg-elev: #16211b;
    --bg-soft: #1a2a21;
    --text: #e8f2ea;
    --text-muted: #a3b8a9;
    --border: rgba(165, 214, 167, 0.16);
    --glass: rgba(22, 33, 27, 0.6);
    --glass-border: rgba(165, 214, 167, 0.18);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
    --grad-banner: linear-gradient(135deg, #0b1f10 0%, #1b5e20 50%, #2e7d32 100%);
    --grad-text: linear-gradient(120deg, #a5d6a7 0%, #dcedc8 50%, #fff59d 100%);
  }
}

*,
*::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: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, 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(67, 160, 71, 0.14), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(165, 214, 167, 0.16), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(85, 139, 47, 0.1), transparent 55%);
  background-attachment: fixed;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

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

a {
  color: var(--green-600);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

a:hover,
a:focus-visible {
  color: var(--green-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 0.6em;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  font-weight: 700;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
}

h3 {
  font-size: clamp(1.08rem, 1.8vw, 1.25rem);
  font-weight: 700;
  color: var(--green-800);
}

html[data-theme="dark"] h3 {
  color: var(--green-300);
}

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

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
  color: var(--text-muted);
}

li {
  margin-bottom: 0.4em;
}

li::marker {
  color: var(--green-600);
}

blockquote {
  margin: 1.2em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--green-600);
  border-radius: var(--radius-sm);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0 0 0.6em;
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

.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;
}

:focus-visible {
  outline: 3px solid var(--green-300);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection {
  background: var(--green-300);
  color: var(--green-900);
}

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

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand svg {
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease);
}

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

.brand-name {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

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

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

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: translateX(-50%);
  transition: width 0.3s var(--ease);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--green-800);
  background: rgba(67, 160, 71, 0.1);
  text-decoration: none;
  transform: translateY(-1px);
}

html[data-theme="dark"] #main-nav a:hover {
  color: var(--green-100);
}

#main-nav a:hover::after {
  width: 60%;
}

.site-search {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 3px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-search:focus-within {
  border-color: var(--green-600);
  box-shadow: 0 0 0 4px rgba(67, 160, 71, 0.16);
}

.site-search input[type="search"] {
  border: 0;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: var(--text);
  width: 190px;
  border-radius: var(--radius-pill);
  outline: none;
  font-family: inherit;
}

.site-search input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.site-search button {
  border: 0;
  cursor: pointer;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  font-family: inherit;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), filter 0.25s var(--ease);
}

.site-search button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(67, 160, 71, 0.35);
  filter: brightness(1.05);
}

.site-search button:active {
  transform: translateY(0);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.86rem;
  font-weight: 600;
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  background: var(--green-800);
  color: #fff;
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

/* ============ Main layout ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 60px;
}

main > section {
  margin-bottom: 28px;
  padding: 32px clamp(20px, 3vw, 40px);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  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);
}

main > section::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(67, 160, 71, 0.12), transparent 70%);
  pointer-events: none;
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(67, 160, 71, 0.28);
}

/* Scroll reveal */
main > section {
  opacity: 0;
  transform: translateY(26px);
  animation: sectionReveal 0.7s var(--ease) forwards;
}

main > section:nth-of-type(1) { animation-delay: 0.02s; }
main > section:nth-of-type(2) { animation-delay: 0.06s; }
main > section:nth-of-type(3) { animation-delay: 0.1s; }
main > section:nth-of-type(4) { animation-delay: 0.14s; }
main > section:nth-of-type(5) { animation-delay: 0.18s; }
main > section:nth-of-type(6) { animation-delay: 0.22s; }
main > section:nth-of-type(7) { animation-delay: 0.26s; }
main > section:nth-of-type(8) { animation-delay: 0.3s; }
main > section:nth-of-type(9) { animation-delay: 0.34s; }
main > section:nth-of-type(10) { animation-delay: 0.38s; }
main > section:nth-of-type(11) { animation-delay: 0.42s; }
main > section:nth-of-type(12) { animation-delay: 0.46s; }
main > section:nth-of-type(n+13) { animation-delay: 0.5s; }

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

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

/* ============ Breadcrumb ============ */
.breadcrumb {
  margin-bottom: 18px;
  padding: 0 4px;
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb a {
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.breadcrumb a:hover {
  background: rgba(67, 160, 71, 0.12);
  color: var(--green-800);
  text-decoration: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--green-800);
  font-weight: 600;
}

html[data-theme="dark"] .breadcrumb [aria-current="page"] {
  color: var(--green-300);
}

/* ============ Banner ============ */
.banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--grad-banner);
  isolation: isolate;
  min-height: 220px;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, 0.18), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(255, 245, 157, 0.16), transparent 40%);
  pointer-events: none;
  z-index: 1;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.8s var(--ease), transform 1.2s var(--ease);
  pointer-events: none;
}

.banner-slide.active {
  opacity: 1;
  transform: scale(1);
  position: relative;
  pointer-events: auto;
}

.banner-slide svg {
  width: 100%;
  height: auto;
  min-height: 220px;
  display: block;
}

.banner-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 3;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.22);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.banner-dots .dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 50%;
  border: 0;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.45);
  transition: width 0.35s var(--ease), background 0.35s var(--ease), transform 0.25s var(--ease);
}

.banner-dots .dot:hover {
  transform: scale(1.25);
  background: rgba(255, 255, 255, 0.8);
}

.banner-dots .dot.active {
  width: 26px;
  border-radius: var(--radius-pill);
  background: var(--lime-200);
}

/* ============ Intro & stats ============ */
.intro {
  text-align: left;
}

.intro h1 {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.8em;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 26px;
}

.stat {
  padding: 22px 16px;
  border-radius: var(--radius-md);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

.stat::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease);
}

.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(67, 160, 71, 0.4);
}

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

.stat .num {
  display: block;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.1;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat small {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ============ Articles ============ */
#articles article {
  padding: 22px 24px;
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  position: relative;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.35s var(--ease), border-color 0.35s var(--ease);
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
  opacity: 0;
  transform: scaleY(0.4);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: var(--bg-elev);
  border-color: rgba(67, 160, 71, 0.35);
}

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

#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.4em;
}

#articles article p {
  font-size: 0.94rem;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--green-600);
  color: var(--green-800);
  transition: background 0.3s var(--ease), color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

#articles article a::after {
  content: "→";
  transition: transform 0.3s var(--ease);
}

#articles article a:hover {
  background: var(--green-800);
  color: #fff;
  text-decoration: none;
  transform: translateX(2px);
  box-shadow: 0 8px 18px rgba(46, 125, 50, 0.28);
}

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

html[data-theme="dark"] #articles article a {
  color: var(--green-300);
  border-color: var(--green-300);
}

html[data-theme="dark"] #articles article a:hover {
  background: var(--green-600);
  color: #08120c;
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-soft);
  overflow: hidden;
  transition: box-shadow 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
}

#faq details[open] {
  background: var(--bg-elev);
  border-color: rgba(67, 160, 71, 0.4);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--green-800);
  background: var(--bg-elev);
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), color 0.35s var(--ease);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--green-800);
  color: #fff;
  border-color: var(--green-800);
}

#faq summary:hover {
  color: var(--green-800);
  background: rgba(67, 160, 71, 0.08);
}

html[data-theme="dark"] #faq summary:hover {
  color: var(--green-300);
}

#faq details > p {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 0.94rem;
  animation: faqFade 0.4s var(--ease);
}

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

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

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

#sitemap a:hover,
#links a:hover {
  transform: translateY(-3px);
  background: var(--grad-accent);
  color: #fff;
  border-color: transparent;
  text-decoration: none;
  box-shadow: 0 10px 22px rgba(67, 160, 71, 0.3);
}

/* ============ HowTo steps ============ */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 16px 20px 16px 62px;
  border-radius: var(--radius-md);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

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

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--grad-accent);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(67, 160, 71, 0.35);
}

/* ============ Footer ============ */
footer#contact {
  margin-top: 40px;
  padding: 56px 20px 32px;
  background: var(--grad-banner);
  color: #e8f2ea;
  position: relative;
  overflow: hidden;
}

footer#contact::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(255, 255, 255, 0.12), transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(255, 245, 157, 0.1), transparent 45%);
  pointer-events: none;
}

footer#contact > section {
  max-width: var(--maxw);
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.07);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: background 0.35s var(--ease), transform 0.35s var(--ease);
}

footer#contact > section:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

footer#contact h2 {
  color: #fff;
  font-size: 1.1rem;
  padding-left: 0;
  margin-bottom: 0.8em;
}

footer#contact h2::before {
  display: none;
}

footer#contact p,
footer#contact address p {
  color: rgba(232, 242, 234, 0.82);
  margin: 0 0 0.5em;
  font-style: normal;
}

footer#contact address {
  font-style: normal;
}

footer#contact a {
  color: var(--green-100);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.25s var(--ease);
}

footer#contact a:hover {
  color: var(--lime-200);
}

footer#contact .copyright {
  max-width: var(--maxw);
  margin: 24px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
  font-size: 0.86rem;
  color: rgba(232, 242, 234, 0.7);
  position: relative;
  z-index: 1;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 120;
  border: 0;
  cursor: pointer;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  color: var(--green-800);
  font-weight: 700;
  font-size: 0.86rem;
  font-family: inherit;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}

html[data-theme="dark"] #back-to-top {
  color: var(--green-100);
}

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

#back-to-top:hover {
  background: var(--green-800);
  color: #fff;
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 12px;
  }

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

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

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  #menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  #main-nav {
    flex-basis: 100%;
    order: 10;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease), opacity 0.35s var(--ease);
    opacity: 0;
  }

  #main-nav.open {
    max-height: 640px;
    opacity: 1;
    padding-top: 8px;
  }

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

  #main-nav a {
    display: block;
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
  }

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

  .site-search {
    flex-basis: 100%;
    order: 11;
    margin-top: 4px;
  }

  .site-search input[type="search"] {
    flex: 1;
    width: auto;
    min-width: 0;
  }

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

  main > section {
    padding: 24px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 18px;
  }

  footer#contact {
    padding: 40px 14px 26px;
  }

  footer#contact > section {
    padding: 18px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 16px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1.02rem;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat {
    padding: 16px 10px;
  }

  .stat small {
    font-size: 0.76rem;
  }

  #articles article {
    padding: 18px;
  }

  #howto ol li {
    padding: 14px 16px 14px 56px;
  }

  #sitemap a,
  #links a {
    padding: 7px 14px;
    font-size: 0.84rem;
  }

  .banner-dots {
    bottom: 10px;
    padding: 6px 10px;
    gap: 7px;
  }
}

@media (max-width: 380px) {
  .stats {
    grid-template-columns: 1fr;
  }

  .brand-name {
    font-size: 0.94rem;
  }
}

@media (hover: none) {
  .stat:hover,
  #articles article:hover,
  #sitemap a:hover,
  #links a:hover,
  #howto ol li:hover,
  main > section:hover {
    transform: none;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .banner-dots,
  .site-search,
  #theme-toggle,
  #menu-toggle {
    display: none !important;
  }

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

  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    opacity: 1;
    transform: none;
    animation: none;
    break-inside: avoid;
  }

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