:root {
  --lime: #7BC96F;
  --lime-light: #a8e6a3;
  --lime-dark: #4a9e3f;
  --lime-glow: rgba(123, 201, 111, 0.35);
  --bg: #f9fbf7;
  --bg-card: rgba(255, 255, 255, 0.82);
  --bg-card-solid: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text: #2c3e50;
  --text-heading: #1e3d2b;
  --text-muted: #4a6b5a;
  --border: rgba(123, 201, 111, 0.18);
  --shadow: 0 4px 24px rgba(123, 201, 111, 0.12);
  --shadow-hover: 0 12px 40px rgba(123, 201, 111, 0.25);
  --footer-bg: #1e3d2b;
  --footer-text: #c8e6c9;
  --footer-link: #a5d6a7;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 24px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@media (prefers-color-scheme: dark) {
  :root {
    --lime: #8ed983;
    --lime-light: #b5f0ae;
    --lime-dark: #5cb84f;
    --lime-glow: rgba(142, 217, 131, 0.3);
    --bg: #0f1a12;
    --bg-card: rgba(26, 46, 33, 0.78);
    --bg-card-solid: #1a2e21;
    --bg-glass: rgba(26, 46, 33, 0.55);
    --text: #d4e8d8;
    --text-heading: #e8f5e9;
    --text-muted: #9cbfa3;
    --border: rgba(142, 217, 131, 0.15);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
    --footer-bg: #0a120d;
    --footer-text: #a5c9aa;
    --footer-link: #8ed983;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--lime-glow), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(123, 201, 111, 0.08), transparent);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

h1, h2, h3, h4 {
  color: var(--text-heading);
  line-height: 1.35;
  transition: color var(--transition);
}

h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin: 16px 0 8px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--lime), var(--lime-light), transparent) 1;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  margin: 28px 0 10px;
}

h4 {
  font-size: 1rem;
  margin: 20px 0 8px;
}

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

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

a:hover {
  color: var(--lime);
  opacity: 0.9;
}

ul, ol {
  padding-left: 1.4em;
  margin: 0 0 16px;
}

li {
  margin-bottom: 6px;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0 12px;
}

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

blockquote {
  border-left: 4px solid var(--lime);
  padding: 16px 20px;
  margin: 16px 0;
  background: var(--bg-glass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-muted);
  transition: background var(--transition), border-color var(--transition);
}

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

time {
  color: var(--text-muted);
  font-size: 0.9em;
}

figure {
  margin: 24px 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
  text-align: center;
}

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

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, var(--lime-dark) 0%, var(--lime) 50%, var(--lime-light) 100%);
  color: #fff;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition);
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

header strong {
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

header svg circle {
  transition: transform var(--transition);
}

header svg:hover circle {
  transform: scale(1.08);
  transform-origin: center;
}

nav[aria-label="主导航"] {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
}

nav[aria-label="主导航"] a {
  color: #fff;
  text-decoration: none;
  margin-right: 20px;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
  transition: opacity var(--transition);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: width var(--transition);
}

nav[aria-label="主导航"] a:hover {
  opacity: 1;
}

nav[aria-label="主导航"] a:hover::after {
  width: 100%;
}

/* ===== Search ===== */
.search-box form {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-box input[type="search"] {
  padding: 8px 16px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 0.9rem;
  outline: none;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  width: 180px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.search-box input[type="search"]::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.search-box input[type="search"]:focus {
  background: rgba(255, 255, 255, 0.35);
  border-color: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
  width: 220px;
}

.search-box button {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  color: #fff;
  transition: background var(--transition), transform var(--transition);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.search-box button:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(1.08);
}

.search-box button:active {
  transform: scale(0.95);
}

/* ===== Breadcrumb ===== */
nav[aria-label="面包屑"] ol {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 8px;
  font-size: 0.9rem;
}

nav[aria-label="面包屑"] a {
  color: var(--text-muted);
}

nav[aria-label="面包屑"] a:hover {
  color: var(--lime);
}

nav[aria-label="面包屑"] li[aria-current="page"] {
  color: var(--text-heading);
  font-weight: 500;
}

/* ===== Sections ===== */
section {
  margin: 48px 0;
  animation: fadeInUp 0.7s ease-out both;
}

section:nth-child(2) { animation-delay: 0.05s; }
section:nth-child(3) { animation-delay: 0.1s; }
section:nth-child(4) { animation-delay: 0.15s; }
section:nth-child(5) { animation-delay: 0.2s; }
section:nth-child(6) { animation-delay: 0.25s; }
section:nth-child(7) { animation-delay: 0.3s; }
section:nth-child(8) { animation-delay: 0.35s; }

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

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  border: 1px solid var(--border);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(123, 201, 111, 0.06) 0%, transparent 50%, rgba(123, 201, 111, 0.04) 100%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.card:hover::before {
  opacity: 1;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

/* ===== Product Icons ===== */
.grid > div[style*="text-align:center"] {
  transition: transform var(--transition);
}

.grid > div[style*="text-align:center"]:hover {
  transform: translateY(-4px);
}

.grid > div[style*="text-align:center"] svg {
  margin: 0 auto 8px;
  transition: transform var(--transition), filter var(--transition);
  filter: drop-shadow(0 2px 6px rgba(123, 201, 111, 0.2));
}

.grid > div[style*="text-align:center"]:hover svg {
  transform: scale(1.1) rotate(-3deg);
  filter: drop-shadow(0 4px 12px rgba(123, 201, 111, 0.35));
}

.grid > div[style*="text-align:center"] p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  font-weight: 500;
}

/* ===== Articles ===== */
article {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left var(--transition), border-color var(--transition);
}

article:last-of-type {
  border-bottom: none;
}

article:hover {
  padding-left: 8px;
}

article h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  transition: color var(--transition);
}

article:hover h3 {
  color: var(--lime);
}

article p {
  margin: 0 0 6px;
  font-size: 0.92rem;
}

article a {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}

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

/* ===== FAQ ===== */
.faq-item {
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: background var(--transition);
}

.faq-item:hover {
  background: rgba(123, 201, 111, 0.04);
}

.faq-question {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-heading);
  padding: 12px 16px;
  margin: 0;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), padding-left var(--transition);
  position: relative;
}

.faq-question::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--lime);
  transition: transform var(--transition);
  font-size: 0.85em;
}

.faq-item:hover .faq-question::before {
  transform: rotate(90deg);
}

.faq-item:hover .faq-question {
  background: rgba(123, 201, 111, 0.08);
  padding-left: 20px;
}

.faq-answer {
  padding: 4px 20px 12px 36px;
  border-left: 3px solid var(--lime);
  margin: 0 0 12px 16px;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}

.faq-answer p {
  margin: 0;
  color: var(--text-muted);
}

/* ===== HowTo ===== */
#howto ol {
  counter-reset: howto;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 12px 16px 12px 52px;
  margin-bottom: 8px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  background: linear-gradient(135deg, var(--lime), var(--lime-dark));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 2px 8px var(--lime-glow);
}

#howto ol li:hover {
  background: rgba(123, 201, 111, 0.1);
  transform: translateX(4px);
  box-shadow: 0 4px 16px var(--lime-glow);
}

/* ===== Contact ===== */
#contact svg {
  border-radius: var(--radius-sm);
  transition: box-shadow var(--transition);
}

#contact svg:hover {
  box-shadow: 0 8px 32px var(--lime-glow);
}

/* ===== Footer Info ===== */
#footer-info ul[style*="columns"] {
  columns: 2;
  column-gap: 32px;
}

#footer-info ul[style*="columns"] li {
  break-inside: avoid;
}

#footer-info a {
  position: relative;
  transition: color var(--transition), padding-left var(--transition);
}

#footer-info a:hover {
  padding-left: 4px;
}

/* ===== Footer ===== */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 48px 0 24px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
  transition: background var(--transition), color var(--transition);
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--lime-dark), var(--lime), var(--lime-light), var(--lime), var(--lime-dark));
  background-size: 200% 100%;
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

footer .container > div:first-child {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}

footer strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.05rem;
  color: #fff;
}

footer p {
  margin: 4px 0;
  color: var(--footer-text);
  font-size: 0.9rem;
}

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

footer a:hover {
  color: #fff;
  opacity: 1;
}

footer hr {
  border-color: rgba(46, 90, 58, 0.6);
  margin: 28px 0 16px;
}

footer > .container > p:last-child {
  text-align: center;
  font-size: 0.85rem;
  color: var(--footer-text);
  opacity: 0.8;
}

/* ===== Back to Top ===== */
a[aria-label="返回顶部"] {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--lime), var(--lime-dark));
  color: #fff;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.4rem;
  box-shadow: 0 4px 16px var(--lime-glow), 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  z-index: 99;
}

a[aria-label="返回顶部"]:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 28px var(--lime-glow), 0 4px 12px rgba(0, 0, 0, 0.2);
  color: #fff;
}

a[aria-label="返回顶部"]:active {
  transform: translateY(-1px) scale(0.98);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--lime-light);
  border-radius: 4px;
  transition: background var(--transition);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--lime);
}

/* ===== Selection ===== */
::selection {
  background: var(--lime);
  color: #fff;
}

/* ===== Focus Visible ===== */
:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 16px;
  }

  header .container {
    gap: 8px;
  }

  nav[aria-label="主导航"] a {
    margin-right: 14px;
    font-size: 0.88rem;
  }

  .search-box input[type="search"] {
    width: 140px;
  }

  .search-box input[type="search"]:focus {
    width: 170px;
  }
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr !important;
  }

  header .container {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  header .container > div:first-child {
    justify-content: center;
  }

  nav[aria-label="主导航"] {
    justify-content: center;
    gap: 2px 0;
  }

  nav[aria-label="主导航"] a {
    margin-right: 12px;
    font-size: 0.85rem;
  }

  .search-box form {
    justify-content: center;
  }

  .search-box input[type="search"] {
    width: 100%;
    max-width: 260px;
  }

  .search-box input[type="search"]:focus {
    width: 100%;
    max-width: 260px;
  }

  .card {
    padding: 20px 16px;
    border-radius: 14px;
  }

  section {
    margin: 32px 0;
  }

  h1 {
    font-size: 1.35rem;
  }

  h2 {
    font-size: 1.15rem;
  }

  #footer-info ul[style*="columns"] {
    columns: 1;
  }

  footer .container > div:first-child {
    flex-direction: column;
    gap: 20px;
  }

  a[aria-label="返回顶部"] {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }

  .faq-answer {
    padding-left: 20px;
    margin-left: 8px;
  }

  #howto ol li {
    padding-left: 44px;
  }

  #howto ol li::before {
    left: 10px;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }

  .card {
    padding: 16px 12px;
  }

  nav[aria-label="主导航"] {
    gap: 0;
  }

  nav[aria-label="主导航"] a {
    margin-right: 10px;
    font-size: 0.8rem;
  }

  blockquote {
    padding: 12px 14px;
  }

  footer {
    padding: 32px 0 16px;
  }

  a[aria-label="返回顶部"] {
    bottom: 16px;
    right: 16px;
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== Print ===== */
@media print {
  header,
  footer,
  a[aria-label="返回顶部"] {
    display: none;
  }

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

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}