:root {
  --color-bg: #0f1020;
  --color-bg-alt: #16182e;
  --color-surface: rgba(255, 255, 255, 0.06);
  --color-surface-solid: #1a1c33;
  --color-border: rgba(255, 255, 255, 0.12);
  --color-text: #e8e9f3;
  --color-text-muted: #a4a7c2;
  --color-primary: #e94560;
  --color-primary-soft: rgba(233, 69, 96, 0.16);
  --color-accent: #5f7cff;
  --color-accent-soft: rgba(95, 124, 255, 0.16);
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
  --gradient-primary: linear-gradient(135deg, #e94560 0%, #5f7cff 100%);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.4);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --maxw: 1200px;
  --transition: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f4f5fb;
    --color-bg-alt: #eceef8;
    --color-surface: rgba(255, 255, 255, 0.72);
    --color-surface-solid: #ffffff;
    --color-border: rgba(26, 28, 51, 0.1);
    --color-text: #1a1c33;
    --color-text-muted: #5b5f7d;
    --color-primary-soft: rgba(233, 69, 96, 0.1);
    --color-accent-soft: rgba(95, 124, 255, 0.1);
    --gradient-banner: linear-gradient(135deg, #e9ecff 0%, #dfe6ff 45%, #f6e8ee 100%);
    --shadow-sm: 0 4px 14px rgba(26, 28, 51, 0.08);
    --shadow-md: 0 12px 32px rgba(26, 28, 51, 0.1);
    --shadow-lg: 0 24px 60px rgba(26, 28, 51, 0.14);
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, var(--color-primary-soft), transparent 42%),
    radial-gradient(circle at 88% 0%, var(--color-accent-soft), transparent 46%),
    radial-gradient(circle at 50% 120%, var(--color-accent-soft), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.75rem, 4.2vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  position: relative;
  padding-bottom: var(--space-3);
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--color-text);
}

h4 {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-muted);
}

ul, ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.25em;
}

li {
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
}

time {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

blockquote {
  margin: 0 0 var(--space-5);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--color-accent);
}

blockquote p {
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin-bottom: var(--space-3);
}

blockquote footer {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  text-align: right;
}

/* ================= Header ================= */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.topbar {
  background: var(--gradient-primary);
  color: #fff;
  text-align: center;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  padding: var(--space-2) var(--space-4);
  font-weight: 500;
}

.topbar span {
  display: inline-block;
  opacity: 0.96;
}

header nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--space-2) var(--space-4);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

header nav::-webkit-scrollbar {
  height: 4px;
}

header nav::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-pill);
}

header nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

header nav li {
  margin: 0;
}

header nav a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

header nav a:hover,
header nav a:focus-visible {
  color: var(--color-text);
  background: var(--color-primary-soft);
  transform: translateY(-2px);
}

/* ================= Main layout ================= */
main {
  display: block;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-8);
}

section {
  margin-bottom: var(--space-7);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

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

section > h2 {
  margin-top: 0;
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* ================= Banner ================= */
#banner {
  position: relative;
  overflow: hidden;
  background: var(--gradient-banner);
  border: 1px solid var(--color-border);
  padding: var(--space-7) var(--space-6);
  isolation: isolate;
}

#banner::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto -20%;
  height: 120%;
  background:
    radial-gradient(circle at 20% 30%, rgba(233, 69, 96, 0.28), transparent 55%),
    radial-gradient(circle at 80% 20%, rgba(95, 124, 255, 0.26), transparent 55%);
  filter: blur(40px);
  z-index: -1;
  animation: floatY 9s ease-in-out infinite;
}

#banner h1 {
  max-width: 900px;
  background: linear-gradient(120deg, var(--color-text) 0%, var(--color-primary) 55%, var(--color-accent) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 8s linear infinite;
}

#banner > p {
  max-width: 860px;
  font-size: 1.02rem;
  color: var(--color-text-muted);
}

/* ================= Carousel ================= */
.carousel {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(300px, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-6);
  padding-bottom: var(--space-3);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.carousel::-webkit-scrollbar {
  height: 6px;
}

.carousel::-webkit-scrollbar-track {
  background: transparent;
}

.carousel::-webkit-scrollbar-thumb {
  background: var(--color-primary-soft);
  border-radius: var(--radius-pill);
}

.carousel figure {
  margin: 0;
  scroll-snap-align: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface-solid);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.carousel figure:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow: var(--shadow-lg);
}

.carousel figure svg {
  width: 100%;
  height: auto;
}

.carousel figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* ================= Articles & News ================= */
main article {
  position: relative;
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

main article:last-child {
  margin-bottom: 0;
}

main article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(95, 124, 255, 0.34);
}

main article h3 {
  margin-bottom: var(--space-2);
}

main article h3 a {
  color: inherit;
}

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

main article a[href^="#article"] {
  display: inline-block;
  margin-top: var(--space-2);
  font-weight: 600;
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.3);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

main article a[href^="#article"]:hover,
main article a[href^="#article"]:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.42);
  filter: brightness(1.08);
  color: #fff;
}

/* ================= FAQ / Details ================= */
details {
  margin-bottom: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

details[open] {
  border-color: rgba(233, 69, 96, 0.34);
  box-shadow: var(--shadow-md);
  background: var(--color-surface-solid);
}

details:hover {
  border-color: rgba(95, 124, 255, 0.34);
}

details summary {
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: var(--space-6);
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
}

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

details summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

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

details summary:hover {
  color: var(--color-primary);
}

details p {
  margin-top: var(--space-3);
  margin-bottom: 0;
  animation: fadeIn 0.4s ease both;
}

/* ================= Sitemap / Links lists ================= */
#sitemap ul,
#links ul,
footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}

#sitemap li,
#links li,
footer nav li {
  margin: 0;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), color var(--transition), background var(--transition), border-color var(--transition);
}

#sitemap a:hover,
#links a:hover,
#sitemap a:focus-visible,
#links a:focus-visible {
  color: #fff;
  background: var(--gradient-primary);
  border-color: transparent;
  transform: translateY(-2px);
}

/* ================= Contact ================= */
#contact p {
  padding-left: var(--space-4);
  border-left: 3px solid var(--color-primary-soft);
  transition: border-color var(--transition), padding-left var(--transition);
}

#contact p:hover {
  border-left-color: var(--color-primary);
  padding-left: var(--space-5);
}

/* ================= Footer ================= */
footer[role="contentinfo"] {
  margin-top: var(--space-8);
  padding: var(--space-7) var(--space-4) var(--space-6);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  text-align: center;
}

footer[role="contentinfo"] p {
  margin: 0 0 var(--space-2);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

footer[role="contentinfo"] > p:first-child {
  font-weight: 600;
  color: var(--color-text);
}

footer nav {
  margin-top: var(--space-4);
}

footer nav ul {
  justify-content: center;
}

footer nav a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

footer nav a:hover,
footer nav a:focus-visible {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ================= Responsive ================= */
@media (max-width: 900px) {
  main {
    padding: var(--space-5) var(--space-3) var(--space-7);
  }

  section {
    padding: var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
  }

  #banner {
    padding: var(--space-6) var(--space-4);
  }

  .carousel {
    grid-auto-columns: minmax(260px, 86%);
    gap: var(--space-4);
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  .topbar {
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    padding: var(--space-2) var(--space-3);
  }

  header nav {
    padding: var(--space-2) var(--space-3);
  }

  header nav a {
    font-size: 0.82rem;
    padding: var(--space-1) var(--space-2);
  }

  main {
    padding: var(--space-4) var(--space-3) var(--space-6);
  }

  section {
    padding: var(--space-4);
    border-radius: var(--radius-md);
  }

  h2::after {
    width: 42px;
    height: 3px;
  }

  #banner {
    padding: var(--space-5) var(--space-4);
  }

  #banner > p {
    font-size: 0.95rem;
  }

  .carousel {
    grid-auto-columns: 88%;
  }

  main article {
    padding: var(--space-4);
  }

  details {
    padding: var(--space-3) var(--space-4);
  }

  blockquote {
    padding: var(--space-4);
  }

  footer[role="contentinfo"] {
    padding: var(--space-6) var(--space-3) var(--space-5);
  }
}

@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;
  }
}

@media print {
  body {
    background: #fff;
    color: #000;
  }

  header[role="banner"],
  footer[role="contentinfo"],
  .carousel {
    display: none;
  }

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

  a {
    color: #000;
    text-decoration: underline;
  }
}