:root {
  --bg: #f7f8fc;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #1a1a2e;
  --text-soft: #4a4a68;
  --text-muted: #6b6b85;
  --border: rgba(26, 26, 46, 0.1);
  --primary: #e94560;
  --primary-dark: #c9314b;
  --primary-soft: rgba(233, 69, 96, 0.12);
  --secondary: #0f3460;
  --accent: #533483;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.08), rgba(83, 52, 131, 0.08));
  --header-h: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d18;
    --bg-alt: #14141f;
    --surface: rgba(26, 26, 46, 0.6);
    --surface-solid: #1a1a2e;
    --text: #ececf5;
    --text-soft: #c0c0d5;
    --text-muted: #8f8fa8;
    --border: rgba(236, 236, 245, 0.12);
    --primary-soft: rgba(233, 69, 96, 0.18);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
    --gradient-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.14), rgba(83, 52, 131, 0.14));
  }
}

html[data-theme="dark"] {
  --bg: #0d0d18;
  --bg-alt: #14141f;
  --surface: rgba(26, 26, 46, 0.6);
  --surface-solid: #1a1a2e;
  --text: #ececf5;
  --text-soft: #c0c0d5;
  --text-muted: #8f8fa8;
  --border: rgba(236, 236, 245, 0.12);
  --primary-soft: rgba(233, 69, 96, 0.18);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --gradient-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.14), rgba(83, 52, 131, 0.14));
}

html[data-theme="light"] {
  --bg: #f7f8fc;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #1a1a2e;
  --text-soft: #4a4a68;
  --text-muted: #6b6b85;
  --border: rgba(26, 26, 46, 0.1);
  --primary-soft: rgba(233, 69, 96, 0.12);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --gradient-soft: linear-gradient(135deg, rgba(233, 69, 96, 0.08), rgba(83, 52, 131, 0.08));
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.1), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(15, 52, 96, 0.1), transparent 46%),
    radial-gradient(circle at 50% 92%, rgba(83, 52, 131, 0.08), transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

.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;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.brand-logo svg {
  transition: transform var(--transition);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

.brand-logo:hover svg {
  transform: rotate(-12deg) scale(1.08);
}

.brand-logo:hover {
  color: var(--primary);
}

.brand-name {
  white-space: nowrap;
}

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

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

#main-nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

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

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

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

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

.site-search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 4px 4px 14px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.site-search input {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  width: 130px;
  padding: 6px 0;
  font-family: inherit;
}

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

.site-search input:focus {
  outline: none;
}

.site-search button {
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.site-search button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.4);
  filter: brightness(1.08);
}

#theme-toggle,
#menu-toggle {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  color: var(--text-soft);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
}

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

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.breadcrumb {
  padding: 20px 0 4px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

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

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

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

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

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

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 40px;
  align-items: center;
  margin: 24px 0 56px;
  padding: 56px 48px;
  border-radius: var(--radius-lg);
  background: var(--gradient-hero);
  color: #f4f4fa;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 78% 18%, rgba(233, 69, 96, 0.35), transparent 42%),
    radial-gradient(circle at 18% 82%, rgba(83, 52, 131, 0.4), transparent 46%);
  z-index: -1;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

.hero::after {
  content: "";
  position: absolute;
  top: -60%;
  left: -20%;
  width: 60%;
  height: 220%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.08), transparent);
  transform: rotate(18deg);
  z-index: -1;
  animation: heroShine 8s ease-in-out infinite;
}

@keyframes heroGlow {
  0% {
    opacity: 0.85;
    transform: scale(1);
  }
  100% {
    opacity: 1;
    transform: scale(1.08);
  }
}

@keyframes heroShine {
  0%,
  100% {
    transform: translateX(-30%) rotate(18deg);
    opacity: 0.4;
  }
  50% {
    transform: translateX(180%) rotate(18deg);
    opacity: 0.9;
  }
}

.hero-text h1 {
  font-size: clamp(1.5rem, 3vw, 2.15rem);
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
  background: linear-gradient(120deg, #ffffff 0%, #ffd6de 55%, #d9c8ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: #fff;
}

.hero-lead {
  font-size: 1.02rem;
  color: rgba(244, 244, 250, 0.92);
  margin-bottom: 16px;
}

.hero-text > p:not(.hero-lead) {
  font-size: 0.95rem;
  color: rgba(244, 244, 250, 0.76);
  margin-bottom: 8px;
}

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

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.45);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(233, 69, 96, 0.55);
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  transform: translateY(-3px);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  animation: floatY 6s ease-in-out infinite;
}

.hero-visual svg:hover {
  transform: scale(1.04) rotate(-1.5deg);
}

@keyframes floatY {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

main > section:not(.hero) {
  margin-bottom: 32px;
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

main > section:not(.hero)::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition);
}

main > section:not(.hero):hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.25);
}

main > section:not(.hero):hover::before {
  opacity: 1;
}

main > section:not(.hero) > h2 {
  font-size: clamp(1.3rem, 2.2vw, 1.65rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
  margin-bottom: 20px;
  padding-left: 18px;
  position: relative;
}

main > section:not(.hero) > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 5px;
  border-radius: 4px;
  background: var(--gradient-accent);
  box-shadow: 0 2px 8px rgba(233, 69, 96, 0.4);
}

main h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 26px 0 10px;
  line-height: 1.5;
  display: flex;
  align-items: center;
  gap: 8px;
}

main h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  flex-shrink: 0;
  box-shadow: 0 0 0 3px var(--primary-soft);
}

main h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-soft);
  margin: 18px 0 8px;
}

main p {
  color: var(--text-soft);
  margin-bottom: 14px;
  font-size: 0.97rem;
}

main section > p:last-child {
  margin-bottom: 0;
}

main a:not(.btn-primary):not(.btn-secondary) {
  font-weight: 500;
  position: relative;
}

main a:not(.btn-primary):not(.btn-secondary):hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.news-list {
  display: grid;
  gap: 12px;
}

.news-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.news-list li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(233, 69, 96, 0.35);
}

.news-list time {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.news-list a {
  color: var(--text);
  font-weight: 500;
  flex: 1;
  min-width: 180px;
}

.news-list a:hover {
  color: var(--primary);
}

#articles article {
  margin-top: 20px;
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  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: rgba(233, 69, 96, 0.3);
}

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

#articles article h3 {
  margin-top: 0;
  font-size: 1.05rem;
}

#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

#articles article p {
  font-size: 0.93rem;
  margin-bottom: 12px;
}

#articles article > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--primary-soft);
  transition: background var(--transition), transform var(--transition);
}

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

#articles article > a:hover {
  text-decoration: none;
  background: var(--primary);
  color: #fff;
  transform: translateX(2px);
}

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

#howto ol {
  counter-reset: step;
  display: grid;
  gap: 14px;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 16px 20px 16px 62px;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(233, 69, 96, 0.35);
}

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

#faq details[open] {
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-sm);
}

#faq details:hover {
  border-color: rgba(233, 69, 96, 0.35);
}

#faq summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 52px 18px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: color var(--transition), background var(--transition);
  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;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

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

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

#faq details p {
  padding: 0 20px 20px;
  font-size: 0.94rem;
  color: var(--text-soft);
  animation: fadeSlideIn 0.35s ease both;
}

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

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 16px 0 8px;
}

.contact-list li {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  font-size: 0.93rem;
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-list li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(233, 69, 96, 0.35);
}

.contact-list a {
  font-weight: 600;
}

.sitemap-list,
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0;
}

.sitemap-list a,
.friend-links a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  text-decoration: none;
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(233, 69, 96, 0.35);
}

#links > p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 14px;
}

#site-footer {
  position: relative;
  background: var(--gradient-hero);
  color: rgba(244, 244, 250, 0.8);
  padding: 56px 0 32px;
  margin-top: 40px;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(233, 69, 96, 0.22), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(83, 52, 131, 0.28), transparent 50%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.footer-inner section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  padding-bottom: 10px;
  position: relative;
}

.footer-inner section h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.footer-inner section p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(244, 244, 250, 0.72);
  margin-bottom: 6px;
}

.footer-inner a {
  color: #ffb3c1;
}

.footer-inner a:hover {
  color: #fff;
}

#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(233, 69, 96, 0.6);
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 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;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1080px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 20px;
  }
  #main-nav {
    order: 3;
    flex-basis: 100%;
  }
  #main-nav ul {
    justify-content: center;
  }
  .site-search input {
    width: 110px;
  }
  .hero {
    grid-template-columns: 1fr;
    padding: 44px 36px;
    text-align: left;
  }
  .hero-visual {
    order: -1;
  }
  .hero-visual svg {
    max-width: 320px;
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 64px;
  }
  .header-inner {
    padding: 10px 16px;
  }
  .brand-name {
    font-size: 0.95rem;
  }
  #menu-toggle {
    display: inline-flex;
  }
  #main-nav {
    display: none;
    order: 4;
    flex-basis: 100%;
    background: var(--surface-solid);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 10px;
    box-shadow: var(--shadow-md);
    animation: fadeSlideIn 0.3s ease both;
  }
  #main-nav.open {
    display: block;
  }
  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    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;
  }
  .header-tools {
    margin-left: auto;
  }
  .site-search {
    display: none;
  }
  main {
    padding: 0 16px 60px;
  }
  main > section:not(.hero) {
    padding: 26px 20px;
    border-radius: var(--radius-md);
  }
  .hero {
    padding: 32px 22px;
    border-radius: var(--radius-md);
    margin: 16px 0 32px;
    gap: 24px;
  }
  .hero-text h1 {
    font-size: 1.35rem;
  }
  .hero-lead {
    font-size: 0.95rem;
  }
  .hero-actions {
    gap: 10px;
  }
  .btn-primary,
  .btn-secondary {
    padding: 11px 22px;
    font-size: 0.9rem;
    flex: 1;
    min-width: 140px;
  }
  .hero-visual svg {
    max-width: 260px;
  }
  .news-list li {
    padding: 12px 14px;
  }
  #articles article {
    padding: 18px;
  }
  #howto ol li {
    padding: 14px 16px 14px 56px;
  }
  #faq summary {
    padding: 15px 46px 15px 16px;
    font-size: 0.93rem;
  }
  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.9rem;
  }
  .contact-list {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 26px;
    padding: 0 16px;
  }
  #site-footer {
    padding: 40px 0 28px;
  }
  #back-to-top {
    right: 16px;
    bottom: 16px;
    padding: 10px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 420px) {
  body {
    font-size: 15px;
  }
  .brand-name {
    display: none;
  }
  .hero-text h1 {
    font-size: 1.22rem;
  }
  main h3 {
    font-size: 1rem;
  }
  .sitemap-list a,
  .friend-links a {
    padding: 7px 14px;
    font-size: 0.85rem;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .hero-visual,
  .hero-actions {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}