:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-hover: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(26, 26, 46, 0.72);
  --glass-border: rgba(255, 255, 255, 0.12);
  --text-primary: #eaeaf2;
  --text-secondary: #b3b5c6;
  --text-muted: #8a8ca0;
  --accent: #e94560;
  --accent-2: #533483;
  --accent-3: #0f3460;
  --accent-glow: rgba(233, 69, 96, 0.35);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #533483 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #b83b5e 50%, #533483 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --max-width: 1180px;
  --transition: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f4f5fb;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(26, 26, 46, 0.1);
    --text-primary: #1a1a2e;
    --text-secondary: #3f4257;
    --text-muted: #6b6e85;
    --accent-glow: rgba(233, 69, 96, 0.22);
    --gradient-hero: linear-gradient(135deg, #e8eaf6 0%, #d9dcf0 40%, #c3b8e8 100%);
    --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
    --shadow-md: 0 8px 28px rgba(26, 26, 46, 0.12);
    --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.16);
  }
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.12), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(83, 52, 131, 0.16), transparent 46%),
    radial-gradient(circle at 50% 96%, rgba(15, 52, 96, 0.18), transparent 50%);
  pointer-events: none;
}

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

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

a:hover,
a:focus-visible {
  color: var(--accent);
  opacity: 0.82;
}

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

ul {
  list-style: none;
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.brand svg {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 3px 8px var(--accent-glow));
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-8deg) scale(1.06);
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#site-header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.35rem;
  align-items: center;
}

#site-header nav a {
  display: inline-block;
  padding: 0.42rem 0.78rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  transition: color var(--transition), background var(--transition),
    transform var(--transition);
}

#site-header nav a:hover,
#site-header nav a:focus-visible {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  opacity: 1;
  transform: translateY(-2px);
}

/* ============ Main layout ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

section {
  margin-bottom: 1.75rem;
  padding: 1.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), border-color var(--transition);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

section:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.28);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  section,
  .brand svg,
  #site-header nav a {
    animation: none !important;
    transition: none !important;
  }
}

/* ============ Hero ============ */
#hero {
  position: relative;
  overflow: hidden;
  padding: 3rem 1.75rem;
  background: var(--gradient-hero);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto auto;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--accent-glow), transparent 68%);
  filter: blur(8px);
  z-index: -1;
  animation: floatGlow 12s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -38% -14%;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(15, 52, 96, 0.5), transparent 70%);
  filter: blur(10px);
  z-index: -1;
  animation: floatGlow 14s ease-in-out infinite alternate-reverse;
}

@keyframes floatGlow {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-30px, 24px, 0) scale(1.12);
  }
}

#hero h1 {
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin-bottom: 1rem;
  background: linear-gradient(120deg, #ffffff 0%, #ffd6de 55%, #c3b8e8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.18);
}

@media (prefers-color-scheme: light) {
  #hero h1 {
    background: linear-gradient(120deg, #1a1a2e 0%, #b83b5e 60%, #533483 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

#hero p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  max-width: 72ch;
}

#hero p + p {
  margin-top: 0.9rem;
}

/* ============ Typography ============ */
h2 {
  position: relative;
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 1.1rem;
  padding-left: 1.1rem;
  color: var(--text-primary);
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  box-shadow: 0 0 14px var(--accent-glow);
}

h3 {
  font-size: 1.06rem;
  font-weight: 700;
  margin: 1.35rem 0 0.55rem;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

h3:first-of-type {
  margin-top: 0.5rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: 0.65rem;
  max-width: 78ch;
}

section > p:last-child,
section > h3 + p:last-child {
  margin-bottom: 0;
}

/* ============ Articles / News cards ============ */
#news article,
#articles article {
  position: relative;
  padding: 1.15rem 1.25rem;
  margin-bottom: 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}

#news article:last-child,
#articles article:last-child {
  margin-bottom: 0;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1rem;
  bottom: 1.1rem;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: rgba(233, 69, 96, 0.3);
  box-shadow: var(--shadow-md);
}

#news article:hover::before,
#articles article:hover::before {
  opacity: 1;
}

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

#news article p:first-of-type,
#articles article p:first-of-type {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 0.45rem;
}

#news article a,
#articles article a {
  display: inline-block;
  margin-top: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.32rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(233, 69, 96, 0.4);
  background: rgba(233, 69, 96, 0.08);
  transition: background var(--transition), transform var(--transition),
    box-shadow var(--transition);
}

#news article a:hover,
#articles article a:hover {
  background: var(--gradient-accent);
  color: #fff;
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--accent-glow);
}

/* ============ FAQ ============ */
#faq h3 {
  position: relative;
  padding: 0.7rem 1rem 0.7rem 2.1rem;
  margin: 0.6rem 0 0;
  font-size: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: default;
  transition: background var(--transition), border-color var(--transition),
    transform var(--transition);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent);
  background: rgba(233, 69, 96, 0.12);
  width: 1.35rem;
  height: 1.35rem;
  line-height: 1.35rem;
  text-align: center;
  border-radius: 50%;
}

#faq h3:hover {
  background: var(--bg-card-hover);
  border-color: rgba(233, 69, 96, 0.3);
  transform: translateX(4px);
}

#faq h3 + p {
  padding: 0.55rem 1rem 0.75rem 2.1rem;
  margin-bottom: 0.35rem;
  border-left: 2px solid rgba(233, 69, 96, 0.25);
  margin-left: 0.85rem;
  font-size: 0.95rem;
}

/* ============ HowTo ============ */
#howto h3 {
  display: inline-block;
  padding: 0.28rem 0.85rem;
  font-size: 0.95rem;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 14px var(--accent-glow);
  margin-top: 1.25rem;
}

#howto h3:first-of-type {
  margin-top: 0;
}

/* ============ Lists (sitemap / links) ============ */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.6rem;
}

#sitemap li,
#links li {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition),
    background var(--transition), box-shadow var(--transition);
}

#sitemap li:hover,
#links li:hover {
  transform: translateY(-3px);
  border-color: rgba(233, 69, 96, 0.35);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-sm);
}

#sitemap a,
#links a {
  display: block;
  padding: 0.6rem 0.9rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

#sitemap a:hover,
#links a:hover {
  color: var(--accent);
  opacity: 1;
}

/* ============ Contact ============ */
#contact p {
  padding-left: 0.25rem;
}

#contact h3 {
  color: var(--accent);
}

/* ============ Author ============ */
#author {
  background: linear-gradient(
    135deg,
    rgba(233, 69, 96, 0.1),
    rgba(83, 52, 131, 0.1)
  );
}

/* ============ Footer ============ */
footer {
  border-top: 1px solid var(--glass-border);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  padding: 2rem 1.25rem;
  text-align: center;
}

footer p {
  margin: 0 auto 0.4rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

footer p:nth-child(2) {
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.03em;
}

footer nav {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

footer nav a {
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}

footer nav a:hover {
  color: var(--accent);
  background: var(--bg-card-hover);
  opacity: 1;
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
  }

  #site-header nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  #site-header nav::-webkit-scrollbar {
    display: none;
  }

  #site-header nav ul {
    flex-wrap: nowrap;
    padding-bottom: 0.15rem;
  }

  #site-header nav a {
    white-space: nowrap;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  main {
    padding: 1rem 0.85rem 2.25rem;
  }

  section {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.15rem;
  }

  #hero {
    padding: 2rem 1.15rem;
  }

  h2 {
    padding-left: 0.9rem;
    margin-bottom: 0.9rem;
  }

  h2::before {
    width: 4px;
  }

  #news article,
  #articles article {
    padding: 1rem;
  }

  #faq h3 {
    padding-left: 1.95rem;
  }

  #faq h3 + p {
    padding-left: 1rem;
  }

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

  footer nav {
    font-size: 0.82rem;
  }
}

@media (max-width: 380px) {
  .brand-name {
    font-size: 1.15rem;
  }

  #hero h1 {
    font-size: 1.42rem;
  }
}

/* ============ Print ============ */
@media print {
  body::before,
  #site-header,
  footer nav {
    display: none;
  }

  section {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  a {
    color: #000;
  }
}