:root {
  --brand-primary: #e94560;
  --brand-secondary: #533483;
  --brand-accent: #0f3460;
  --brand-dark: #1a1a2e;
  --brand-light: #f5f5f5;
  --bg-body: #f7f7fb;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --bg-header: rgba(26, 26, 46, 0.82);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #7a7a9a;
  --text-invert: #f5f5f5;
  --border-color: rgba(26, 26, 46, 0.1);
  --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, 0.16);
  --shadow-glow: 0 8px 32px rgba(233, 69, 96, 0.28);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --gradient-brand: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #533483 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #0f3460 45%, #533483 80%, #e94560 130%);
  --gradient-card: linear-gradient(160deg, rgba(233, 69, 96, 0.08), rgba(83, 52, 131, 0.08));
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-body: #0d0d1a;
    --bg-card: #16162a;
    --bg-card-hover: #1c1c34;
    --bg-glass: rgba(22, 22, 42, 0.72);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --bg-header: rgba(13, 13, 26, 0.85);
    --text-primary: #ececf5;
    --text-secondary: #b0b0cc;
    --text-muted: #8080a0;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
    --shadow-glow: 0 8px 32px rgba(233, 69, 96, 0.35);
    --gradient-card: linear-gradient(160deg, rgba(233, 69, 96, 0.12), rgba(83, 52, 131, 0.12));
  }
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-body);
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--text-primary);
}

h1 { font-size: clamp(1.6rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.45rem); }
h4 { font-size: clamp(1rem, 1.8vw, 1.2rem); }

p { margin-bottom: 0.9em; }

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

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

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--brand-primary), var(--brand-secondary));
  border-radius: 10px;
  border: 2px solid var(--bg-body);
}

#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-header);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

#site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.header-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text-invert);
  opacity: 1;
}

.brand-logo:hover {
  opacity: 1;
  transform: translateY(-1px);
}

.brand-logo svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px rgba(233, 69, 96, 0.4), 0 4px 16px rgba(233, 69, 96, 0.3);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.brand-logo:hover svg {
  box-shadow: 0 0 0 2px var(--brand-primary), 0 6px 24px rgba(233, 69, 96, 0.5);
  transform: rotate(-4deg) scale(1.05);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(90deg, #fff 20%, #ffb3c1 60%, var(--brand-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

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

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.main-nav ul::-webkit-scrollbar { display: none; }

.main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(245, 245, 245, 0.82);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

.main-nav a:hover {
  color: #fff;
  background: rgba(233, 69, 96, 0.15);
  opacity: 1;
}

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

.search-box {
  flex-shrink: 0;
}

.search-box form {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.search-box form:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.22);
  background: rgba(255, 255, 255, 0.16);
}

.search-box input {
  width: 170px;
  padding: 8px 14px;
  border: none;
  outline: none;
  background: transparent;
  color: #fff;
  font-size: 0.85rem;
  font-family: inherit;
}

.search-box input::placeholder {
  color: rgba(245, 245, 245, 0.55);
}

.search-box button {
  padding: 8px 16px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  transition: filter var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
  filter: brightness(1.12);
}

.search-box button:active {
  transform: scale(0.96);
}

#menu-toggle {
  display: none;
  padding: 8px 14px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: rgba(233, 69, 96, 0.2);
  border: 1px solid rgba(233, 69, 96, 0.5);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#menu-toggle:hover {
  background: rgba(233, 69, 96, 0.35);
}

#menu-toggle:active {
  transform: scale(0.95);
}

main {
  padding-top: var(--header-height);
}

.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 20px 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 6px;
  color: var(--text-muted);
  opacity: 0.6;
}

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

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

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

.hero-section {
  position: relative;
  max-width: var(--max-width);
  margin: 20px auto 0;
  padding: clamp(36px, 6vw, 72px) clamp(24px, 5vw, 64px);
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: var(--text-invert);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 18%, rgba(233, 69, 96, 0.45), transparent 42%),
    radial-gradient(circle at 88% 82%, rgba(83, 52, 131, 0.55), transparent 48%),
    radial-gradient(circle at 70% 10%, rgba(15, 52, 96, 0.5), transparent 40%);
  z-index: -1;
  animation: heroShift 14s ease-in-out infinite alternate;
}

.hero-section::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  z-index: -1;
  mask-image: radial-gradient(circle at 50% 50%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, #000 30%, transparent 78%);
}

@keyframes heroShift {
  0% { transform: scale(1) rotate(0deg); }
  100% { transform: scale(1.15) rotate(3deg); }
}

.hero-section h1 {
  color: #fff;
  margin-bottom: 18px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
  letter-spacing: 0.01em;
}

.hero-lead {
  max-width: 820px;
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  line-height: 1.9;
  color: rgba(245, 245, 245, 0.9);
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}

.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;
  letter-spacing: 0.02em;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), color var(--transition-base);
  will-change: transform;
}

.btn-primary {
  color: #fff;
  background: var(--gradient-accent);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  color: #fff;
  opacity: 1;
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 40px rgba(233, 69, 96, 0.5);
}

.btn-secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  color: #fff;
  opacity: 1;
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 32px rgba(255, 255, 255, 0.16);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.stat-item {
  padding: 20px 16px;
  text-align: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.3);
}

.stat-number {
  display: block;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(90deg, #fff, #ffb3c1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: rgba(245, 245, 245, 0.78);
  letter-spacing: 0.04em;
}

.content-section {
  max-width: var(--max-width);
  margin: 28px auto 0;
  padding: clamp(26px, 4.5vw, 52px) clamp(20px, 4vw, 48px);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.content-section:hover {
  box-shadow: var(--shadow-md);
}

.content-section h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 22px;
}

.content-section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
  transition: width var(--transition-slow);
}

.content-section:hover h2::after {
  width: 120px;
}

.content-section h3 {
  margin: 26px 0 12px;
  color: var(--text-primary);
  padding-left: 14px;
  border-left: 4px solid var(--brand-primary);
}

.content-section h4 {
  margin: 20px 0 8px;
  color: var(--brand-secondary);
}

.content-section p {
  color: var(--text-secondary);
  margin-bottom: 1em;
}

.content-section a {
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.content-section a:hover {
  border-bottom-color: var(--brand-primary);
}

.article-card {
  position: relative;
  padding: 24px;
  margin-bottom: 18px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.article-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-lg);
}

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

.article-card h3 {
  position: relative;
  margin: 0 0 8px;
  padding-left: 0;
  border-left: none;
  font-size: clamp(1.02rem, 1.9vw, 1.25rem);
  transition: color var(--transition-fast);
}

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

.article-card p {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.article-card p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.article-card a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.article-card a::after {
  content: "→";
  transition: transform var(--transition-base);
}

.article-card a:hover::after {
  transform: translateX(5px);
}

.article-detail {
  margin-top: 22px;
  padding: 26px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border-left: 5px solid var(--brand-primary);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.article-detail:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.article-detail h3 {
  margin-top: 0;
  padding-left: 0;
  border-left: none;
  color: var(--brand-secondary);
}

.article-detail p {
  font-size: 0.95rem;
  line-height: 1.9;
}

blockquote {
  position: relative;
  margin: 16px 0;
  padding: 18px 22px 18px 54px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote::before {
  content: "“";
  position: absolute;
  left: 16px;
  top: 6px;
  font-size: 3rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--brand-primary);
  opacity: 0.7;
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--text-secondary);
}

#howto ol {
  counter-reset: howto;
  margin: 16px 0;
}

#howto ol li {
  position: relative;
  counter-increment: howto;
  padding: 14px 18px 14px 58px;
  margin-bottom: 10px;
  border-radius: var(--radius-md);
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-accent);
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-sm);
}

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

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

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

#faq summary {
  position: relative;
  padding: 16px 48px 16px 20px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  border-radius: 50%;
  background: var(--gradient-accent);
  transition: transform var(--transition-base), background var(--transition-base);
}

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

#faq summary:hover {
  color: var(--brand-primary);
  background: var(--gradient-card);
}

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  animation: fadeSlideIn 0.4s ease both;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

#sitemap li a,
#links li a {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: transform var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap li a:hover,
#links li a:hover {
  transform: translateY(-3px);
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

#contact p {
  padding: 10px 14px;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-body);
  border-left: 3px solid var(--brand-primary);
  font-size: 0.92rem;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

#contact p:hover {
  transform: translateX(5px);
  background: var(--gradient-card);
}

#legal h3 {
  margin-top: 22px;
}

footer {
  margin-top: 40px;
  padding: 40px 20px;
  background: var(--gradient-brand);
  color: rgba(245, 245, 245, 0.85);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(233, 69, 96, 0.25), transparent 45%),
              radial-gradient(circle at 80% 80%, rgba(83, 52, 131, 0.35), transparent 50%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-inner p {
  font-size: 0.88rem;
  margin-bottom: 6px;
  color: rgba(245, 245, 245, 0.78);
}

.footer-inner nav {
  margin-top: 18px;
}

.footer-inner nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
}

.footer-inner nav a {
  font-size: 0.88rem;
  color: rgba(245, 245, 245, 0.82);
  position: relative;
  transition: color var(--transition-fast);
}

.footer-inner nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--brand-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.footer-inner nav a:hover {
  color: #fff;
  opacity: 1;
}

.footer-inner nav a:hover::after {
  transform: scaleX(1);
}

#back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 900;
  padding: 12px 18px;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base), filter var(--transition-fast);
}

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

#back-to-top:hover {
  filter: brightness(1.12);
  transform: translateY(-4px) scale(1.05);
}

#back-to-top:active {
  transform: translateY(-1px) scale(0.98);
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

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

@media (max-width: 992px) {
  .header-inner {
    gap: 12px;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    background: var(--bg-header);
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: max-height var(--transition-slow);
  }

  .main-nav.open {
    max-height: 70vh;
    overflow-y: auto;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 16px 18px;
    overflow: visible;
  }

  .main-nav a {
    padding: 13px 14px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

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

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

  .search-box {
    order: 3;
    width: 100%;
    display: none;
  }

  .search-box.mobile-visible {
    display: block;
  }

  .search-box input {
    width: 100%;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 14px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-logo svg {
    width: 34px;
    height: 34px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .stat-item {
    padding: 16px 14px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .article-detail {
    padding: 20px 16px;
  }

  #howto ol li {
    padding: 12px 14px 12px 52px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 15px;
    font-size: 0.78rem;
  }
}

@media (max-width: 480px) {
  .content-section {
    border-radius: var(--radius-md);
    padding: 22px 16px;
  }

  .hero-section {
    border-radius: var(--radius-lg);
    margin-left: 10px;
    margin-right: 10px;
  }

  .breadcrumb {
    padding: 14px 14px 0;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  blockquote {
    padding: 16px 16px 16px 44px;
  }
}

@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 print {
  #site-header,
  #back-to-top,
  footer nav,
  .search-box,
  #menu-toggle {
    display: none !important;
  }

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

  .content-section,
  .article-card,
  .hero-section {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}