:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #23233f;
  --bg-card: rgba(35, 35, 63, 0.65);
  --bg-glass: rgba(255, 255, 255, 0.06);
  --bg-glass-hover: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f0f8;
  --text-secondary: #b8b8d0;
  --text-muted: #8888a8;
  --accent: #7c5cff;
  --accent-light: #a78bfa;
  --accent-2: #ff6b9d;
  --accent-3: #4ecdc4;
  --gradient-main: linear-gradient(135deg, #7c5cff 0%, #ff6b9d 100%);
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #2d1b69 40%, #7c5cff 70%, #ff6b9d 100%);
  --gradient-card: linear-gradient(145deg, rgba(124, 92, 255, 0.12), rgba(255, 107, 157, 0.08));
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(124, 92, 255, 0.4);
  --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, 0.5);
  --shadow-glow: 0 0 24px rgba(124, 92, 255, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --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);
  --max-width: 1200px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #ececf5;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-glass: rgba(255, 255, 255, 0.55);
    --bg-glass-hover: rgba(255, 255, 255, 0.8);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a8;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(124, 92, 255, 0.5);
    --shadow-sm: 0 2px 8px rgba(80, 60, 180, 0.08);
    --shadow-md: 0 8px 24px rgba(80, 60, 180, 0.12);
    --shadow-lg: 0 16px 48px rgba(80, 60, 180, 0.16);
    --shadow-glow: 0 0 24px rgba(124, 92, 255, 0.15);
    --gradient-banner: linear-gradient(135deg, #e8e0ff 0%, #d4c8ff 30%, #a78bfa 65%, #ff9cc0 100%);
    --gradient-card: linear-gradient(145deg, rgba(124, 92, 255, 0.08), rgba(255, 107, 157, 0.05));
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 120px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124, 92, 255, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(255, 107, 157, 0.1), transparent);
  background-attachment: fixed;
}

::selection {
  background: rgba(124, 92, 255, 0.35);
  color: var(--text-primary);
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 10px;
  border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-light), var(--accent-2));
}

/* ========== HEADER ========== */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition), box-shadow var(--transition);
}

header:hover {
  background: var(--bg-glass-hover);
  box-shadow: var(--shadow-md);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.topbar span:first-child {
  font-weight: 600;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  letter-spacing: 0.5px;
}

.topbar span:last-child {
  letter-spacing: 1px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  overflow-x: auto;
  scrollbar-width: none;
}

nav::-webkit-scrollbar {
  display: none;
}

nav a {
  position: relative;
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

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

nav a:hover,
nav a:focus-visible {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
  transform: translateY(-1px);
}

nav a:hover::after,
nav a:focus-visible::after {
  width: 60%;
}

/* ========== MAIN LAYOUT ========== */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

section {
  margin-bottom: 64px;
  animation: fadeInUp 0.7s ease both;
}

section:nth-child(odd) {
  animation-delay: 0.05s;
}

section:nth-child(even) {
  animation-delay: 0.1s;
}

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

@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;
  }
}

/* ========== TYPOGRAPHY ========== */

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-wrap: balance;
}

h2 {
  position: relative;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 24px;
  padding-left: 20px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 70%;
  border-radius: 4px;
  background: var(--gradient-main);
  box-shadow: var(--shadow-glow);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  font-weight: 700;
  margin: 28px 0 14px;
  color: var(--text-primary);
  line-height: 1.5;
}

h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 20px 0 10px;
  color: var(--accent-light);
  line-height: 1.5;
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  text-align: justify;
  text-justify: inter-ideograph;
  word-break: break-word;
}

strong {
  color: var(--text-primary);
  font-weight: 700;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-2);
}

ul, ol {
  margin: 0 0 20px 24px;
  color: var(--text-secondary);
}

li {
  margin-bottom: 8px;
  line-height: 1.7;
}

/* ========== BANNER ========== */

.banner {
  position: relative;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 28px 0 32px;
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  background: var(--gradient-banner);
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  isolation: isolate;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18), transparent 45%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1), transparent 40%);
  z-index: -1;
}

.banner::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 255, 255, 0.12) 50%, transparent 60%);
  animation: shimmer 6s linear infinite;
  z-index: -1;
  pointer-events: none;
}

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

@keyframes shimmer {
  0% { transform: translateX(-50%) rotate(0deg); }
  100% { transform: translateX(50%) rotate(0deg); }
}

.banner .slide {
  flex: 1 1 220px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #ffffff;
  font-weight: 600;
  font-size: 1.05rem;
  text-align: center;
  letter-spacing: 0.5px;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  cursor: default;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.banner .slide:hover {
  transform: translateY(-4px) scale(1.02);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ========== CARDS (articles / news) ========== */

article {
  position: relative;
  margin-bottom: 20px;
  padding: 24px 26px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  overflow: hidden;
}

article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

article:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

article:hover::before {
  opacity: 1;
}

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

article h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.15rem;
  transition: color var(--transition);
}

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

article p {
  margin-bottom: 10px;
  font-size: 0.95rem;
}

article p:first-of-type {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  padding: 6px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--gradient-main);
  border-radius: 100px;
  box-shadow: 0 4px 12px rgba(124, 92, 255, 0.3);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

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

article a:hover {
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(124, 92, 255, 0.45);
  filter: brightness(1.1);
}

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

/* ========== CONTACT / SITEMAP / LINKS LISTS ========== */

#contact ul,
#sitemap ul,
#links ul {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 10px;
}

#contact ul {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

#sitemap ul,
#links ul {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

#contact li,
#sitemap li,
#links li {
  position: relative;
  padding: 12px 16px 12px 40px;
  margin: 0;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: transform var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

#contact li::before,
#sitemap li::before,
#links li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-main);
  transform: translateY(-50%);
  box-shadow: 0 0 8px rgba(124, 92, 255, 0.5);
  transition: transform var(--transition);
}

#contact li:hover,
#sitemap li:hover,
#links li:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
  box-shadow: var(--shadow-sm);
}

#contact li:hover::before,
#sitemap li:hover::before,
#links li:hover::before {
  transform: translateY(-50%) scale(1.4);
}

#sitemap li,
#links li {
  padding: 10px 14px 10px 34px;
}

#sitemap li::before,
#links li::before {
  left: 14px;
  width: 6px;
  height: 6px;
}

#sitemap a,
#links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: var(--accent-light);
}

/* ========== FAQ ========== */

#faq h3 {
  position: relative;
  padding: 16px 20px 16px 52px;
  margin: 16px 0 0;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-bottom: none;
  font-size: 1rem;
  color: var(--text-primary);
  cursor: default;
  transition: background var(--transition), border-color var(--transition);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--gradient-main);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(124, 92, 255, 0.4);
}

#faq h3 + p {
  margin: 0 0 16px;
  padding: 16px 20px 18px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-top: 2px solid rgba(124, 92, 255, 0.25);
  font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition);
}

#faq h3:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  border-bottom: none;
}

#faq h3:hover + p {
  border-color: var(--border-hover);
  border-top-color: var(--accent);
}

/* ========== HOWTO ========== */

#howto h4 {
  position: relative;
  padding: 12px 18px 12px 48px;
  margin: 16px 0 10px;
  border-radius: var(--radius-sm);
  background: var(--gradient-card);
  border-left: 3px solid var(--accent);
  color: var(--text-primary);
  font-size: 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto h4::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--accent);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.15);
}

#howto h4:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

#howto h4 + p {
  padding-left: 18px;
  margin-bottom: 20px;
}

/* ========== FOOTER ========== */

footer {
  position: relative;
  margin-top: 40px;
  padding: 56px 24px 32px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  background-size: 200% 100%;
  animation: gradientShift 6s ease infinite;
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 28px;
  animation: none;
}

footer h2 {
  font-size: 1.05rem;
  padding-left: 16px;
  margin-bottom: 12px;
}

footer h2::before {
  width: 4px;
  height: 60%;
}

footer p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-align: left;
}

#meta {
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

#meta p {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ========== RESPONSIVE ========== */

@media (max-width: 900px) {
  main {
    padding: 28px 18px 60px;
  }

  section {
    margin-bottom: 48px;
  }

  .topbar {
    padding: 6px 18px;
    font-size: 0.72rem;
  }

  nav {
    padding: 10px 18px;
    gap: 2px;
  }

  nav a {
    padding: 7px 12px;
    font-size: 0.85rem;
  }

  .banner {
    padding: 24px 20px;
    gap: 12px;
  }

  .banner .slide {
    flex: 1 1 100%;
    padding: 16px 18px;
    font-size: 0.98rem;
  }

  article {
    padding: 20px 18px;
  }

  footer {
    padding: 40px 18px 24px;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  html {
    scroll-padding-top: 140px;
  }

  main {
    padding: 20px 14px 48px;
  }

  section {
    margin-bottom: 40px;
  }

  h1 {
    font-size: 1.5rem;
    line-height: 1.4;
    margin-bottom: 18px;
  }

  h2 {
    font-size: 1.25rem;
    padding-left: 16px;
    margin-bottom: 18px;
  }

  h2::before {
    width: 4px;
  }

  h3 {
    font-size: 1.05rem;
    margin: 22px 0 10px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 6px 14px;
  }

  nav {
    padding: 8px 14px;
    gap: 0;
  }

  nav a {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

  .banner {
    padding: 18px 14px;
    border-radius: var(--radius-md);
  }

  .banner .slide {
    padding: 14px;
    font-size: 0.9rem;
  }

  article {
    padding: 16px 14px;
    border-radius: var(--radius-sm);
  }

  article h3 {
    font-size: 1rem;
  }

  article a {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  #contact ul {
    grid-template-columns: 1fr;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, 1fr);
  }

  #contact li,
  #sitemap li,
  #links li {
    padding: 10px 12px 10px 32px;
    font-size: 0.85rem;
  }

  #contact li::before {
    left: 12px;
  }

  #faq h3 {
    padding: 14px 14px 14px 46px;
    font-size: 0.95rem;
  }

  #faq h3::before {
    left: 12px;
    width: 22px;
    height: 22px;
    font-size: 0.72rem;
  }

  #faq h3 + p {
    padding: 14px 14px 16px;
    font-size: 0.9rem;
  }

  #howto h4 {
    padding: 10px 14px 10px 40px;
    font-size: 0.95rem;
  }

  #howto h4::before {
    left: 14px;
    width: 14px;
    height: 14px;
  }

  footer {
    padding: 32px 14px 20px;
  }

  footer h2 {
    font-size: 1rem;
  }
}

/* ========== ACCESSIBILITY & FOCUS ========== */

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

/* ========== PRINT ========== */

@media print {
  header,
  nav,
  .banner,
  footer {
    display: none;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

  h1, h2, h3, h4 {
    color: #000000;
    -webkit-text-fill-color: #000000;
  }

  article {
    border: 1px solid #cccccc;
    box-shadow: none;
    background: #ffffff;
  }
}