:root {
  --spade-black: #1a1a2e;
  --spade-deep: #16213e;
  --spade-purple: #0f3460;
  --spade-accent: #e94560;
  --spade-accent-2: #533483;
  --spade-gold: #f0c040;
  --spade-light: #f5f5f7;
  --spade-card: rgba(255, 255, 255, 0.08);
  --spade-card-hover: rgba(255, 255, 255, 0.14);
  --spade-glass: rgba(255, 255, 255, 0.06);
  --spade-glass-border: rgba(255, 255, 255, 0.12);
  --spade-text: #eaeaea;
  --spade-text-dim: #a0a0b8;
  --spade-text-muted: #6c6c88;
  --spade-bg: #0d0d1a;
  --spade-bg-alt: #12122a;
  --spade-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --spade-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --spade-radius: 16px;
  --spade-radius-sm: 10px;
  --spade-radius-lg: 24px;
  --spade-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --spade-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --spade-bg: #f0f0f5;
    --spade-bg-alt: #ffffff;
    --spade-text: #1a1a2e;
    --spade-text-dim: #4a4a6a;
    --spade-text-muted: #8888a0;
    --spade-card: rgba(255, 255, 255, 0.7);
    --spade-card-hover: rgba(255, 255, 255, 0.9);
    --spade-glass: rgba(255, 255, 255, 0.55);
    --spade-glass-border: rgba(0, 0, 0, 0.08);
    --spade-shadow: 0 8px 32px rgba(26, 26, 46, 0.1);
    --spade-shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.15);
  }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--spade-font);
  background: var(--spade-bg);
  color: var(--spade-text);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--spade-transition), color var(--spade-transition);
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(233, 69, 96, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(83, 52, 131, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(15, 52, 96, 0.12) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

::selection {
  background: var(--spade-accent);
  color: #fff;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--spade-accent), var(--spade-accent-2));
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--spade-accent);
}

/* ===== Header / Nav ===== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 13, 26, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--spade-glass-border);
  transition: background var(--spade-transition), box-shadow var(--spade-transition);
}

@media (prefers-color-scheme: light) {
  header {
    background: rgba(255, 255, 255, 0.72);
  }
}

header:hover {
  box-shadow: 0 4px 30px rgba(233, 69, 96, 0.08);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

nav > a:first-child {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--spade-text);
  text-decoration: none;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--spade-accent), var(--spade-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: transform var(--spade-transition), filter var(--spade-transition);
  flex-shrink: 0;
}

nav > a:first-child:hover {
  transform: scale(1.05);
  filter: brightness(1.2);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav ul li a {
  display: block;
  padding: 8px 14px;
  color: var(--spade-text-dim);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: var(--spade-radius-sm);
  transition: all var(--spade-transition);
  position: relative;
  white-space: nowrap;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, var(--spade-accent), var(--spade-gold));
  border-radius: 2px;
  transition: transform var(--spade-transition);
}

nav ul li a:hover {
  color: var(--spade-text);
  background: var(--spade-glass);
}

nav ul li a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* ===== Main ===== */
main {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

/* ===== Sections ===== */
section {
  margin-bottom: 56px;
  padding: 40px 36px;
  background: var(--spade-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--spade-glass-border);
  border-radius: var(--spade-radius-lg);
  box-shadow: var(--spade-shadow);
  transition: transform var(--spade-transition), box-shadow var(--spade-transition), background var(--spade-transition), border-color var(--spade-transition);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.7s ease forwards;
}

section:nth-child(1) { animation-delay: 0.05s; }
section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.15s; }
section:nth-child(4) { animation-delay: 0.2s; }
section:nth-child(5) { animation-delay: 0.25s; }
section:nth-child(6) { animation-delay: 0.3s; }
section:nth-child(7) { animation-delay: 0.35s; }
section:nth-child(8) { animation-delay: 0.4s; }
section:nth-child(9) { animation-delay: 0.45s; }
section:nth-child(10) { animation-delay: 0.5s; }
section:nth-child(11) { animation-delay: 0.55s; }
section:nth-child(12) { animation-delay: 0.6s; }
section:nth-child(13) { animation-delay: 0.65s; }
section:nth-child(14) { animation-delay: 0.7s; }

section:hover {
  background: var(--spade-card-hover);
  box-shadow: var(--spade-shadow-lg);
  border-color: rgba(233, 69, 96, 0.2);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Home / Hero ===== */
#home {
  position: relative;
  overflow: hidden;
  padding: 72px 48px;
  background: linear-gradient(135deg, #1a1a2e 0%, #0f3460 40%, #533483 70%, #e94560 100%);
  border: none;
  color: #fff;
}

#home::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(240, 192, 64, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(233, 69, 96, 0.12) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-3%, -3%) rotate(3deg); }
}

#home::after {
  content: '♠';
  position: absolute;
  right: 40px;
  bottom: -20px;
  font-size: 180px;
  color: rgba(255, 255, 255, 0.06);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

#home h1 {
  position: relative;
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  z-index: 1;
}

#home p {
  position: relative;
  font-size: 1.05rem;
  line-height: 2;
  color: rgba(255, 255, 255, 0.88);
  max-width: 820px;
  margin-bottom: 16px;
  z-index: 1;
}

#home p:last-child {
  margin-bottom: 0;
}

#home:hover {
  background: linear-gradient(135deg, #1a1a2e 0%, #0f3460 40%, #533483 70%, #e94560 100%);
  border-color: transparent;
}

/* ===== Headings ===== */
h2 {
  font-size: 1.65rem;
  font-weight: 700;
  margin-bottom: 28px;
  padding-bottom: 14px;
  position: relative;
  color: var(--spade-text);
  letter-spacing: 0.3px;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--spade-accent), var(--spade-gold));
  border-radius: 3px;
  transition: width var(--spade-transition);
}

section:hover h2::after {
  width: 100px;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--spade-text);
  padding-left: 14px;
  border-left: 3px solid var(--spade-accent);
  transition: border-color var(--spade-transition), padding-left var(--spade-transition);
}

h3:hover {
  border-left-color: var(--spade-gold);
  padding-left: 18px;
}

h3:first-child {
  margin-top: 0;
}

/* ===== Paragraphs ===== */
p {
  color: var(--spade-text-dim);
  margin-bottom: 12px;
  font-size: 0.95rem;
  line-height: 1.9;
}

/* ===== Lists ===== */
ul, ol {
  color: var(--spade-text-dim);
  padding-left: 22px;
  margin-bottom: 16px;
}

ul li, ol li {
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.8;
  transition: color var(--spade-transition), transform var(--spade-transition);
}

ul li:hover, ol li:hover {
  color: var(--spade-text);
  transform: translateX(4px);
}

ul li::marker {
  color: var(--spade-accent);
}

ol li::marker {
  color: var(--spade-accent);
  font-weight: 700;
}

/* ===== Links ===== */
a {
  color: var(--spade-accent);
  text-decoration: none;
  transition: color var(--spade-transition), opacity var(--spade-transition);
}

a:hover {
  color: var(--spade-gold);
}

/* ===== Articles ===== */
article {
  padding: 24px 28px;
  margin-bottom: 16px;
  background: var(--spade-glass);
  border: 1px solid var(--spade-glass-border);
  border-radius: var(--spade-radius);
  transition: transform var(--spade-transition), box-shadow var(--spade-transition), background var(--spade-transition), border-color var(--spade-transition);
  position: relative;
  overflow: hidden;
}

article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--spade-accent), var(--spade-accent-2));
  opacity: 0;
  transition: opacity var(--spade-transition);
}

article:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 12px 36px rgba(233, 69, 96, 0.12);
  background: var(--spade-card-hover);
  border-color: rgba(233, 69, 96, 0.25);
}

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

article h3 {
  margin-top: 0;
  border-left: none;
  padding-left: 0;
  font-size: 1.1rem;
}

article h3:hover {
  padding-left: 0;
  color: var(--spade-accent);
}

article p {
  font-size: 0.9rem;
}

article p:first-of-type {
  font-size: 0.82rem;
  color: var(--spade-text-muted);
  margin-bottom: 8px;
}

article a {
  display: inline-block;
  margin-top: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 18px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--spade-accent), var(--spade-accent-2));
  color: #fff;
  transition: transform var(--spade-transition), box-shadow var(--spade-transition), filter var(--spade-transition);
}

article a:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
  filter: brightness(1.1);
  color: #fff;
}

/* ===== Blockquotes ===== */
blockquote {
  position: relative;
  margin: 20px 0;
  padding: 24px 28px 24px 56px;
  background: var(--spade-glass);
  border-left: 4px solid var(--spade-accent);
  border-radius: 0 var(--spade-radius) var(--spade-radius) 0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--spade-transition), box-shadow var(--spade-transition), border-color var(--spade-transition);
}

blockquote::before {
  content: '\201C';
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 3.5rem;
  color: var(--spade-accent);
  opacity: 0.35;
  font-family: Georgia, serif;
  line-height: 1;
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 28px rgba(233, 69, 96, 0.1);
  border-left-color: var(--spade-gold);
}

blockquote p {
  color: var(--spade-text-dim);
  font-style: italic;
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* ===== FAQ ===== */
#faq h3 {
  cursor: default;
  padding: 16px 20px;
  margin-top: 12px;
  margin-bottom: 0;
  background: var(--spade-glass);
  border: 1px solid var(--spade-glass-border);
  border-left: 3px solid var(--spade-accent);
  border-radius: var(--spade-radius-sm) var(--spade-radius-sm) 0 0;
  transition: all var(--spade-transition);
  font-size: 1.02rem;
}

#faq h3:hover {
  background: var(--spade-card-hover);
  border-left-color: var(--spade-gold);
  padding-left: 24px;
}

#faq h3 + p {
  padding: 16px 20px;
  margin-top: 0;
  margin-bottom: 8px;
  background: var(--spade-card);
  border: 1px solid var(--spade-glass-border);
  border-top: none;
  border-radius: 0 0 var(--spade-radius-sm) var(--spade-radius-sm);
  transition: all var(--spade-transition);
}

#faq h3:hover + p {
  background: var(--spade-card-hover);
}

/* ===== News ===== */
#news ul {
  list-style: none;
  padding-left: 0;
}

#news ul li {
  position: relative;
  padding: 14px 18px 14px 42px;
  margin-bottom: 8px;
  background: var(--spade-glass);
  border: 1px solid var(--spade-glass-border);
  border-radius: var(--spade-radius-sm);
  font-size: 0.92rem;
  transition: all var(--spade-transition);
}

#news ul li::before {
  content: '📌';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
}

#news ul li:hover {
  background: var(--spade-card-hover);
  transform: translateX(6px);
  border-color: rgba(233, 69, 96, 0.2);
  color: var(--spade-text);
}

/* ===== Contact ===== */
#contact p {
  padding: 10px 16px;
  border-radius: var(--spade-radius-sm);
  transition: background var(--spade-transition), transform var(--spade-transition);
  font-size: 0.95rem;
}

#contact p:hover {
  background: var(--spade-glass);
  transform: translateX(4px);
}

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

#sitemap ul li,
#links ul li {
  margin-bottom: 0;
}

#sitemap ul li a,
#links ul li a {
  display: inline-block;
  padding: 8px 20px;
  background: var(--spade-glass);
  border: 1px solid var(--spade-glass-border);
  border-radius: 24px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--spade-text-dim);
  transition: all var(--spade-transition);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  background: linear-gradient(135deg, var(--spade-accent), var(--spade-accent-2));
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.3);
}

/* ===== Legal ===== */
#legal h3 {
  font-size: 1.05rem;
}

#legal p {
  font-size: 0.9rem;
}

/* ===== Author ===== */
#author p {
  font-size: 0.92rem;
}

#author p:last-child {
  margin-top: 12px;
  padding: 16px 20px;
  background: var(--spade-glass);
  border-radius: var(--spade-radius-sm);
  border-left: 3px solid var(--spade-gold);
  font-size: 0.9rem;
}

/* ===== Footer ===== */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--spade-glass-border);
  background: rgba(13, 13, 26, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

@media (prefers-color-scheme: light) {
  footer {
    background: rgba(255, 255, 255, 0.6);
  }
}

footer p {
  font-size: 0.85rem;
  color: var(--spade-text-muted);
  margin-bottom: 6px;
  transition: color var(--spade-transition);
}

footer p:last-child {
  margin-bottom: 0;
  background: linear-gradient(135deg, var(--spade-accent), var(--spade-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
  font-size: 0.88rem;
}

footer:hover p {
  color: var(--spade-text-dim);
}

footer:hover p:last-child {
  -webkit-text-fill-color: transparent;
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 900px) {
  nav {
    padding: 0 16px;
    height: 60px;
  }

  nav > a:first-child {
    font-size: 1.15rem;
  }

  nav ul {
    gap: 2px;
  }

  nav ul li a {
    padding: 6px 10px;
    font-size: 0.82rem;
  }

  main {
    padding: 0 16px 40px;
  }

  section {
    padding: 28px 22px;
    margin-bottom: 36px;
    border-radius: var(--spade-radius);
  }

  #home {
    padding: 48px 28px;
  }

  #home h1 {
    font-size: 1.8rem;
  }

  #home p {
    font-size: 0.95rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  h3 {
    font-size: 1.05rem;
  }

  article {
    padding: 18px 20px;
  }

  blockquote {
    padding: 18px 20px 18px 48px;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 600px) {
  html {
    font-size: 15px;
  }

  nav {
    flex-direction: column;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }

  nav ul {
    justify-content: center;
    gap: 2px;
  }

  nav ul li a {
    padding: 5px 8px;
    font-size: 0.78rem;
  }

  main {
    padding: 0 12px 32px;
  }

  section {
    padding: 22px 16px;
    margin-bottom: 28px;
    border-radius: var(--spade-radius-sm);
  }

  #home {
    padding: 36px 20px;
  }

  #home::after {
    font-size: 100px;
    right: 10px;
    bottom: -10px;
  }

  #home h1 {
    font-size: 1.45rem;
  }

  #home p {
    font-size: 0.9rem;
    line-height: 1.8;
  }

  h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
  }

  h2::after {
    width: 48px;
    height: 2.5px;
  }

  h3 {
    font-size: 1rem;
    margin-top: 20px;
    padding-left: 10px;
  }

  p {
    font-size: 0.88rem;
  }

  ul li, ol li {
    font-size: 0.88rem;
  }

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

  article h3 {
    font-size: 1rem;
  }

  article a {
    font-size: 0.84rem;
    padding: 5px 14px;
  }

  blockquote {
    padding: 16px 16px 16px 42px;
  }

  blockquote::before {
    font-size: 2.5rem;
    left: 10px;
  }

  #faq h3 {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  #faq h3 + p {
    padding: 12px 14px;
  }

  #news ul li {
    padding: 12px 14px 12px 36px;
    font-size: 0.86rem;
  }

  #news ul li::before {
    left: 10px;
  }

  #sitemap ul,
  #links ul {
    gap: 6px;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  footer {
    padding: 28px 16px;
  }

  footer p {
    font-size: 0.78rem;
  }
}

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

  section {
    opacity: 1;
    transform: none;
  }
}

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

/* ===== Print ===== */
@media print {
  header,
  footer,
  #home::before,
  #home::after {
    display: none;
  }

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

  section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
    opacity: 1;
    transform: none;
    animation: none;
  }
}