:root {
  --pink: #e8577a;
  --pink-dark: #c94b6a;
  --pink-light: #f7b8c8;
  --pink-pale: #fdeef2;
  --bg: #fff8fa;
  --bg-alt: #ffffff;
  --text: #2d2430;
  --text-soft: #6b5a63;
  --text-muted: #9a8a92;
  --border: rgba(232, 87, 122, 0.16);
  --glass: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.55);
  --shadow-sm: 0 2px 10px rgba(201, 75, 106, 0.08);
  --shadow-md: 0 8px 28px rgba(201, 75, 106, 0.12);
  --shadow-lg: 0 18px 48px rgba(201, 75, 106, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --header-h: 72px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --transition: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1218;
    --bg-alt: #241a21;
    --text: #f3e9ee;
    --text-soft: #c9b8c1;
    --text-muted: #9a8a92;
    --border: rgba(247, 184, 200, 0.18);
    --glass: rgba(40, 28, 37, 0.6);
    --glass-border: rgba(247, 184, 200, 0.16);
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 8% 4%, rgba(232, 87, 122, 0.08), transparent 40%),
    radial-gradient(circle at 92% 12%, rgba(247, 184, 200, 0.14), transparent 45%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--pink-dark);
}

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

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

h1 {
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  margin: 0 0 0.6em;
  background: linear-gradient(120deg, var(--pink-dark), var(--pink) 45%, #f38aa6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  margin: 0 0 0.7em;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-full);
  background: linear-gradient(180deg, var(--pink), var(--pink-light));
}

h3 {
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  margin: 1.4em 0 0.5em;
  color: var(--pink-dark);
}

h4 {
  font-size: 1.02rem;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
  color: var(--text-soft);
}

ul, ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.45em;
}

li::marker {
  color: var(--pink);
}

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

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: rgba(232, 87, 122, 0.08);
  padding: 2px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 0.6em;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.3em;
  border-left: 4px solid var(--pink);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
  border-right: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

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

dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.5em 1.2em;
  margin: 1.2em 0;
  padding: 1.2em 1.4em;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

dt {
  font-weight: 700;
  color: var(--pink-dark);
  white-space: nowrap;
}

dd {
  margin: 0;
  color: var(--text-soft);
  word-break: break-word;
}

figure {
  margin: 1.6em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--pink-pale);
}

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

figcaption {
  padding: 0.8em 1.2em;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}

/* ============ Header ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 12px clamp(16px, 4vw, 48px);
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand svg {
  width: 44px;
  height: 44px;
  filter: drop-shadow(0 4px 10px rgba(232, 87, 122, 0.35));
  transition: transform var(--transition);
}

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

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: 0.04em;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav li {
  margin: 0;
}

header nav a {
  display: inline-block;
  padding: 7px 13px;
  font-size: 0.88rem;
  color: var(--text-soft);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

header nav a:hover,
header nav a:focus-visible {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(232, 87, 122, 0.32);
}

/* ============ Main & Sections ============ */
main {
  display: block;
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(16px, 3vw, 32px) clamp(16px, 4vw, 40px) 48px;
}

section {
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: clamp(20px, 3.5vw, 36px);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 22%;
}

@supports not (animation-timeline: view()) {
  section {
    animation: none;
  }
}

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

/* ============ Hero ============ */
#hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px);
  background:
    linear-gradient(135deg, rgba(232, 87, 122, 0.16), rgba(247, 184, 200, 0.28) 45%, rgba(255, 255, 255, 0.1)),
    linear-gradient(160deg, var(--pink-pale), var(--bg-alt));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
}

@media (prefers-color-scheme: dark) {
  #hero {
    background:
      linear-gradient(135deg, rgba(232, 87, 122, 0.22), rgba(120, 50, 80, 0.35) 50%, rgba(40, 28, 37, 0.2)),
      linear-gradient(160deg, #2a1a24, var(--bg-alt));
  }
}

#hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -100px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 87, 122, 0.28), transparent 70%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -140px;
  left: -80px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(247, 184, 200, 0.35), transparent 70%);
  pointer-events: none;
}

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

#hero h1 {
  font-size: clamp(1.5rem, 4.2vw, 2.4rem);
  line-height: 1.3;
}

#hero p {
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  color: var(--text-soft);
  max-width: 78ch;
}

#hero figure {
  margin-top: 1.6em;
  border: 1px solid var(--glass-border);
}

/* ============ Page nav ============ */
nav[aria-label="页面锚点导航"] {
  padding: clamp(18px, 3vw, 28px) clamp(20px, 3.5vw, 36px);
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: clamp(28px, 4vw, 48px);
}

nav[aria-label="页面锚点导航"] h2 {
  font-size: 1.15rem;
}

nav[aria-label="页面锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

nav[aria-label="页面锚点导航"] li {
  margin: 0;
}

nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.88rem;
  color: var(--pink-dark);
  background: rgba(232, 87, 122, 0.08);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

nav[aria-label="页面锚点导航"] a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(232, 87, 122, 0.3);
}

/* ============ Articles ============ */
article {
  padding: clamp(16px, 2.5vw, 24px);
  margin: 0 0 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(232, 87, 122, 0.35);
}

article h3 {
  margin-top: 0;
}

article a {
  display: inline-block;
  margin-top: 4px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(232, 87, 122, 0.1);
  transition: all var(--transition);
}

article a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  transform: translateX(4px);
  box-shadow: 0 6px 16px rgba(232, 87, 122, 0.3);
}

/* Article detail sections */
#articles section[id^="article-"] {
  margin: 0 0 16px;
  padding: clamp(16px, 2.5vw, 24px);
  background: linear-gradient(150deg, rgba(232, 87, 122, 0.05), transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: none;
  animation: none;
}

#articles section[id^="article-"] h4 {
  color: var(--pink-dark);
  margin-bottom: 0.6em;
}

#articles section[id^="article-"] p {
  margin: 0;
}

/* ============ FAQ ============ */
details {
  margin: 0 0 12px;
  padding: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

details[open] {
  border-color: rgba(232, 87, 122, 0.4);
  box-shadow: var(--shadow-sm);
}

details:hover {
  border-color: rgba(232, 87, 122, 0.35);
}

summary {
  position: relative;
  padding: 15px 48px 15px 20px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition), color var(--transition);
}

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

summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  line-height: 1;
  color: var(--pink);
  transition: transform var(--transition);
}

details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

summary:hover {
  background: rgba(232, 87, 122, 0.06);
  color: var(--pink-dark);
}

details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--text-soft);
  font-size: 0.95rem;
  animation: fadeUp 0.35s ease both;
}

/* ============ HowTo ============ */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

#howto ol li {
  position: relative;
  padding: 12px 16px 12px 56px;
  margin-bottom: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(232, 87, 122, 0.3);
}

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

#howto ul li {
  padding: 6px 0;
}

/* ============ Contact & Sitemap ============ */
#contact dl,
#sitemap ul,
#links ul {
  margin-bottom: 0;
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px 16px;
  list-style: none;
  padding: 0;
}

#sitemap li {
  margin: 0;
}

#sitemap a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: var(--text-soft);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

#sitemap a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(232, 87, 122, 0.28);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
}

#links li {
  margin: 0;
}

#links a {
  display: inline-block;
  padding: 7px 16px;
  font-size: 0.88rem;
  color: var(--pink-dark);
  background: rgba(232, 87, 122, 0.08);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

#links a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--pink), var(--pink-dark));
  border-color: transparent;
  transform: translateY(-2px);
}

/* ============ Footer ============ */
footer[role="contentinfo"] {
  padding: clamp(28px, 4vw, 44px) clamp(16px, 4vw, 48px);
  background:
    linear-gradient(160deg, rgba(232, 87, 122, 0.1), transparent 60%),
    var(--bg-alt);
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  margin: 0 0 0.7em;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.7;
}

footer p:first-child {
  font-size: 1rem;
  font-weight: 700;
  color: var(--pink-dark);
  letter-spacing: 0.03em;
}

footer a {
  color: var(--pink);
  padding: 0 4px;
}

footer a:hover {
  color: var(--pink-dark);
  text-decoration: underline;
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  header[role="banner"] {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .brand {
    justify-content: center;
  }

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

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

  dl {
    grid-template-columns: 1fr;
    gap: 0.25em;
  }

  dt {
    margin-top: 0.4em;
  }
}

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

  main {
    padding: 12px 12px 36px;
  }

  section {
    padding: 18px 16px;
    border-radius: var(--radius-md);
  }

  #hero {
    padding: 22px 18px;
    border-radius: var(--radius-md);
  }

  #hero h1 {
    font-size: 1.35rem;
  }

  h2 {
    padding-left: 14px;
    font-size: 1.2rem;
  }

  h2::before {
    width: 4px;
  }

  header nav ul {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

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

  header nav a {
    white-space: nowrap;
  }

  nav[aria-label="页面锚点导航"] ul {
    gap: 8px;
  }

  nav[aria-label="页面锚点导航"] a {
    padding: 7px 12px;
    font-size: 0.82rem;
  }

  #sitemap ul {
    grid-template-columns: 1fr 1fr;
    gap: 6px 10px;
  }

  #sitemap a {
    padding: 7px 10px;
    font-size: 0.82rem;
  }

  blockquote {
    padding: 0.9em 1em;
  }

  summary {
    padding: 13px 42px 13px 16px;
    font-size: 0.94rem;
  }

  details p {
    padding: 0 16px 16px;
  }

  #howto ol li {
    padding: 10px 12px 10px 48px;
  }

  #howto ol li::before {
    left: 10px;
    width: 26px;
    height: 26px;
  }

  figure {
    border-radius: var(--radius-md);
  }

  figcaption {
    font-size: 0.8rem;
    padding: 0.6em 0.9em;
  }

  footer p {
    font-size: 0.8rem;
  }
}

@media (max-width: 380px) {
  #sitemap ul {
    grid-template-columns: 1fr;
  }

  .brand-text strong {
    font-size: 1.05rem;
  }
}

/* ============ Motion preference ============ */
@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;
  }

  section {
    animation: none;
  }
}

/* ============ Print ============ */
@media print {
  header[role="banner"],
  nav[aria-label="页面锚点导航"],
  footer[role="contentinfo"] {
    display: none;
  }

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

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

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