:root {
  --brand-green: #2d5a3d;
  --brand-green-light: #4a8c5f;
  --brand-green-dark: #1e3d29;
  --brand-yellow: #f4c542;
  --brand-yellow-soft: #f8dc7a;
  --bg: #f5f7f5;
  --bg-elevated: #ffffff;
  --bg-muted: #e8f0e9;
  --text: #1d2a22;
  --text-secondary: #4a5a50;
  --text-muted: #71807a;
  --border: rgba(45, 90, 61, 0.12);
  --border-strong: rgba(45, 90, 61, 0.24);
  --shadow-sm: 0 2px 8px rgba(30, 61, 41, 0.06);
  --shadow-md: 0 8px 28px rgba(30, 61, 41, 0.1);
  --shadow-lg: 0 18px 48px rgba(30, 61, 41, 0.16);
  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.55);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --header-h: 72px;
  --container: 1180px;
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
  --gradient-hero: linear-gradient(135deg, #2d5a3d 0%, #4a8c5f 55%, #f4c542 140%);
  --gradient-accent: linear-gradient(120deg, #f4c542 0%, #f8dc7a 100%);
  --gradient-soft: linear-gradient(160deg, #eef4ef 0%, #f7faf7 100%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1612;
    --bg-elevated: #17211b;
    --bg-muted: #1e2a22;
    --text: #e8f0e9;
    --text-secondary: #b6c6bc;
    --text-muted: #8a9c92;
    --border: rgba(232, 240, 233, 0.1);
    --border-strong: rgba(232, 240, 233, 0.2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
    --glass-bg: rgba(23, 33, 27, 0.62);
    --glass-border: rgba(232, 240, 233, 0.14);
    --gradient-hero: linear-gradient(135deg, #1e3d29 0%, #2d5a3d 55%, #6b5a1e 140%);
    --gradient-soft: linear-gradient(160deg, #141d17 0%, #101813 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: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image: radial-gradient(
      circle at 8% 0%,
      rgba(244, 197, 66, 0.1),
      transparent 42%
    ),
    radial-gradient(circle at 92% 8%, rgba(74, 140, 95, 0.12), transparent 46%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a:hover,
a:focus-visible {
  color: var(--brand-yellow);
}

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

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin: 0 0 0.75em;
}

h2 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  margin: 0 0 0.75em;
  position: relative;
  padding-bottom: 0.5em;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
}

h3 {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  margin: 1.6em 0 0.6em;
}

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

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

li {
  margin-bottom: 0.5em;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--brand-yellow);
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

blockquote p {
  margin: 0.4em 0;
}

time {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

:focus-visible {
  outline: 2px solid var(--brand-yellow);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--brand-yellow);
  color: var(--brand-green-dark);
}

.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(--glass-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--text);
}

.logo:hover {
  color: var(--text);
  opacity: 0.9;
}

.logo svg {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, var(--brand-green) 0%, var(--brand-green-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (prefers-color-scheme: dark) {
  .logo-text {
    background: linear-gradient(120deg, #cfe8d6 0%, var(--brand-yellow) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

#site-header nav {
  flex: 1 1 auto;
}

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

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--brand-green);
  background: rgba(244, 197, 66, 0.14);
}

@media (prefers-color-scheme: dark) {
  .nav-list a:hover,
  .nav-list a:focus-visible {
    color: var(--brand-yellow);
  }
}

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

.site-search {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 1 320px;
  margin-left: auto;
}

.site-search input[type="search"] {
  flex: 1;
  min-width: 0;
  padding: 9px 16px;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search input[type="search"]::placeholder {
  color: var(--text-muted);
}

.site-search input[type="search"]:focus {
  outline: none;
  border-color: var(--brand-green-light);
  box-shadow: 0 0 0 3px rgba(74, 140, 95, 0.18);
}

.site-search button {
  padding: 9px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--brand-green-dark);
  background: var(--gradient-accent);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    filter var(--transition);
}

.site-search button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

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

/* ============ Main layout ============ */
main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 72px;
}

main > section {
  margin-top: 56px;
  padding: 40px clamp(20px, 4vw, 48px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

main > section:nth-of-type(odd) {
  background: var(--gradient-soft);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Hero ============ */
#hero {
  margin-top: 32px;
  padding: clamp(32px, 5vw, 64px) clamp(20px, 4vw, 56px);
  background: var(--gradient-hero);
  border: none;
  border-radius: var(--radius-xl);
  color: #f5f9f6;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      circle at 85% 15%,
      rgba(244, 197, 66, 0.35),
      transparent 45%
    ),
    radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.12), transparent 40%);
  pointer-events: none;
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  color: #ffffff;
  max-width: 22em;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
}

.hero-lead {
  max-width: 60ch;
  color: rgba(245, 249, 246, 0.92);
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 36px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition);
  will-change: transform;
}

.btn-primary {
  color: var(--brand-green-dark);
  background: var(--gradient-accent);
  box-shadow: 0 10px 26px rgba(244, 197, 66, 0.35);
}

.btn-primary:hover {
  color: var(--brand-green-dark);
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(244, 197, 66, 0.45);
}

.btn-secondary {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.24);
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.22);
}

.hero-visual {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-visual:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hero-visual svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.hero-visual figcaption {
  padding: 14px 18px;
  font-size: 0.85rem;
  color: rgba(245, 249, 246, 0.88);
  background: rgba(0, 0, 0, 0.14);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  margin-top: 24px;
  animation: fadeUp 0.6s ease both;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 10px 18px;
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
}

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--border-strong);
}

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

.breadcrumb a:hover {
  color: var(--brand-green-light);
}

/* ============ News list ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.news-list li:hover {
  transform: translateX(6px);
  border-color: var(--brand-yellow);
  box-shadow: var(--shadow-md);
}

.news-list time {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--brand-green-light);
  padding: 2px 10px;
  background: rgba(244, 197, 66, 0.16);
  border-radius: 999px;
}

/* ============ Articles ============ */
#articles > article {
  position: relative;
  padding: 24px 26px;
  margin-bottom: 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  overflow: hidden;
}

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

#articles > article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

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

#articles > article h3 {
  margin-top: 0;
  transition: color var(--transition);
}

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

#articles > article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(244, 197, 66, 0.16);
  color: var(--brand-green);
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

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

#articles > article a:hover {
  background: var(--brand-yellow);
  color: var(--brand-green-dark);
  transform: translateX(2px);
}

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

@media (prefers-color-scheme: dark) {
  #articles > article a {
    color: var(--brand-yellow);
  }
}

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

#howto ol li {
  position: relative;
  padding: 14px 18px 14px 62px;
  margin-bottom: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition);
}

#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;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--brand-green-dark);
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

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

#howto ul li::marker {
  color: var(--brand-yellow);
}

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

#faq details[open] {
  border-color: var(--brand-yellow);
  box-shadow: var(--shadow-md);
}

#faq summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition), color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  font-weight: 400;
  line-height: 1;
  color: var(--brand-green-dark);
  background: var(--gradient-accent);
  border-radius: 50%;
  transition: transform var(--transition);
}

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

#faq summary:hover {
  background: rgba(244, 197, 66, 0.1);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  animation: fadeUp 0.35s ease both;
}

/* ============ Contact ============ */
address {
  font-style: normal;
  padding: 20px 24px;
  background: var(--bg-elevated);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
}

address p {
  margin: 0.4em 0;
}

address a {
  font-weight: 600;
}

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

#sitemap li {
  margin: 0;
}

#sitemap a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all var(--transition);
}

#sitemap a:hover {
  color: var(--brand-green-dark);
  background: var(--brand-yellow);
  border-color: var(--brand-yellow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============ Footer ============ */
footer {
  margin-top: 24px;
  padding: 56px 24px 32px;
  background: linear-gradient(180deg, transparent 0%, rgba(45, 90, 61, 0.06) 100%);
  border-top: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  footer {
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.35) 100%);
  }
}

footer > section {
  max-width: var(--container);
  margin: 0 auto 32px;
}

footer h2 {
  font-size: 1.1rem;
  padding-bottom: 0.4em;
}

footer h2::after {
  width: 36px;
  height: 3px;
}

footer h3 {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 1.2em 0 0.4em;
}

footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  list-style: none;
  padding: 0;
}

footer ul li {
  margin: 0;
}

footer p {
  font-size: 0.9rem;
}

.copyright {
  max-width: var(--container);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
  }

  .site-search {
    flex-basis: 100%;
    order: 3;
    margin-left: 0;
    padding-bottom: 12px;
  }

  #site-header nav {
    order: 2;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .logo-text {
    font-size: 1rem;
  }

  .nav-list {
    gap: 2px;
  }

  .nav-list a {
    padding: 6px 9px;
    font-size: 0.82rem;
  }

  main {
    padding: 0 16px 56px;
  }

  main > section {
    margin-top: 32px;
    padding: 28px 20px;
    border-radius: var(--radius-md);
  }

  #hero {
    margin-top: 20px;
    border-radius: var(--radius-lg);
  }

  .hero-actions {
    margin: 22px 0 28px;
  }

  .btn-primary,
  .btn-secondary {
    flex: 1 1 auto;
    padding: 12px 20px;
  }

  .hero-visual svg {
    height: auto;
  }

  #articles > article {
    padding: 20px 18px;
  }

  #faq summary {
    padding: 14px 48px 14px 16px;
    font-size: 0.95rem;
  }

  #howto ol li {
    padding: 12px 14px 12px 56px;
  }

  #howto ol li::before {
    left: 14px;
    width: 28px;
    height: 28px;
    font-size: 0.82rem;
  }

  footer {
    padding: 40px 16px 24px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .site-search button {
    padding: 9px 14px;
  }

  .news-list li {
    padding: 12px 14px;
  }

  .breadcrumb ol {
    border-radius: var(--radius-md);
    padding: 8px 14px;
  }
}

/* ============ Motion & print ============ */
@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;
  }
}

@media print {
  #site-header,
  .hero-actions,
  .site-search,
  #sitemap,
  footer ul {
    display: none;
  }

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

  main > section,
  #articles > article,
  #faq details {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}