:root {
  --sakura-pink: #ff6b9d;
  --sakura-pink-soft: #ffd0e2;
  --sakura-pink-deep: #e04b7d;
  --violet: #7a5cff;
  --teal: #2ec4b6;
  --bg: #fdf7fa;
  --bg-alt: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.72);
  --card-border: rgba(255, 255, 255, 0.6);
  --text: #2b2230;
  --text-soft: #6b6070;
  --text-muted: #9a8fa0;
  --shadow-sm: 0 2px 10px rgba(255, 107, 157, 0.08);
  --shadow-md: 0 8px 28px rgba(255, 107, 157, 0.14);
  --shadow-lg: 0 18px 48px rgba(122, 92, 255, 0.18);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --header-h: 72px;
  --grad-hero: linear-gradient(135deg, #ff6b9d 0%, #ff8fb8 40%, #7a5cff 100%);
  --grad-btn: linear-gradient(135deg, #ff6b9d, #7a5cff);
  --grad-soft: linear-gradient(135deg, rgba(255, 107, 157, 0.12), rgba(122, 92, 255, 0.12));
  --glass-blur: saturate(180%) blur(18px);
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #14101c;
  --bg-alt: #1c1626;
  --card-bg: rgba(38, 30, 52, 0.62);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #f2ecf6;
  --text-soft: #c3b8cd;
  --text-muted: #8d8298;
  --sakura-pink-soft: #5a2e45;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(122, 92, 255, 0.28);
  --grad-soft: linear-gradient(135deg, rgba(255, 107, 157, 0.16), rgba(122, 92, 255, 0.16));
}

*,
*::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: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 107, 157, 0.16), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(122, 92, 255, 0.14), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(46, 196, 182, 0.1), transparent 46%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

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

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

h1 {
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
}

h2 {
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  position: relative;
  padding-left: 18px;
  margin: 0 0 1.2rem;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: var(--grad-btn);
  box-shadow: 0 0 14px rgba(255, 107, 157, 0.5);
}

h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  margin: 1.6rem 0 0.7rem;
}

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

ul,
ol {
  padding-left: 1.4rem;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.5rem;
}

blockquote {
  margin: 0 0 1rem;
  padding: 1rem 1.3rem;
  border-left: 4px solid var(--sakura-pink);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--grad-soft);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-soft);
  font-style: italic;
}

blockquote p {
  margin: 0;
}

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

address {
  font-style: normal;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

::selection {
  background: var(--sakura-pink);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--violet);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ============ HEADER ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.logo svg {
  filter: drop-shadow(0 4px 12px rgba(255, 107, 157, 0.45));
  transition: transform var(--transition);
}

.logo:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

.logo span {
  background: var(--grad-btn);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

#main-nav {
  flex: 1 1 420px;
}

#main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

#main-nav a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
  color: var(--text-soft);
  font-weight: 500;
  transition: all var(--transition);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: #fff;
  background: var(--grad-btn);
  box-shadow: 0 6px 18px rgba(255, 107, 157, 0.35);
  transform: translateY(-2px);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-left: auto;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-search:focus-within {
  border-color: var(--sakura-pink);
  box-shadow: 0 0 0 4px rgba(255, 107, 157, 0.18);
}

.site-search input {
  border: 0;
  outline: 0;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.9rem;
  color: var(--text);
  width: 180px;
  font-family: inherit;
}

.site-search input::placeholder {
  color: var(--text-muted);
}

.site-search button {
  border: 0;
  cursor: pointer;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-btn);
  font-family: inherit;
  transition: filter var(--transition);
}

.site-search button:hover {
  filter: brightness(1.08);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--card-border);
  background: var(--bg-alt);
  color: var(--text-soft);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

/* ============ HERO ============ */
.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 24px 8px;
}

.hero-carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.slide {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
  animation: fadeUp 0.7s both;
}

.slide:nth-child(2) {
  animation-delay: 0.12s;
}

.slide:nth-child(3) {
  animation-delay: 0.24s;
}

.slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.18));
  pointer-events: none;
}

.slide:hover {
  transform: translateY(-8px) scale(1.012);
  box-shadow: var(--shadow-lg);
}

.slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.hero-intro {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 4vw, 44px);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  animation: fadeUp 0.8s both;
}

.hero-intro::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: var(--grad-btn);
}

.hero-intro h1 {
  margin: 0 0 1rem;
  background: var(--grad-btn);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 1.4rem;
}

.hero-anchors a {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--sakura-pink-deep);
  background: var(--grad-soft);
  border: 1px solid rgba(255, 107, 157, 0.28);
  transition: all var(--transition);
}

.hero-anchors a:hover,
.hero-anchors a:focus-visible {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ============ SECTIONS ============ */
.section {
  max-width: 1280px;
  margin: 0 auto 28px;
  padding: clamp(22px, 4vw, 44px);
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
  animation: fadeUp 0.7s both;
}

.section:hover {
  box-shadow: var(--shadow-md);
}

.section > p:first-of-type {
  font-size: 1.02rem;
}

/* ============ NEWS / ARTICLES ============ */
.news-item,
.article-item {
  position: relative;
  padding: 20px 22px 20px 26px;
  margin-bottom: 16px;
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.news-item::before,
.article-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--grad-btn);
  opacity: 0.85;
  transition: width var(--transition);
}

.news-item:hover,
.article-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 107, 157, 0.4);
}

.news-item:hover::before,
.article-item:hover::before {
  width: 8px;
}

.news-item h3,
.article-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.12rem;
}

.news-item a,
.article-item a {
  display: inline-block;
  margin-top: 0.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--grad-soft);
  border: 1px solid rgba(255, 107, 157, 0.28);
  transition: all var(--transition);
}

.news-item a:hover,
.article-item a:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateX(4px);
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

#faq details:hover {
  border-color: rgba(255, 107, 157, 0.4);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

#faq details[open] {
  border-color: rgba(122, 92, 255, 0.45);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  padding: 16px 22px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--sakura-pink);
  transition: transform var(--transition), color var(--transition);
}

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

#faq summary:hover {
  background: var(--grad-soft);
  color: var(--sakura-pink-deep);
}

#faq details p {
  padding: 0 22px 18px;
  margin: 0;
  animation: fadeUp 0.4s both;
}

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

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 12px 16px 12px 58px;
  margin-bottom: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  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: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-btn);
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.4);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

/* ============ CONTACT / SITEMAP / LINKS ============ */
#contact ul,
#sitemap ul,
#links ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 10px;
}

#contact ul li,
#sitemap ul li,
#links ul li {
  padding: 12px 18px;
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin: 0;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#contact ul li:hover,
#sitemap ul li:hover,
#links ul li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 107, 157, 0.4);
}

#sitemap a,
#links a {
  font-weight: 600;
}

/* ============ FOOTER ============ */
#site-footer {
  margin-top: 40px;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-top: 1px solid var(--card-border);
  position: relative;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--grad-btn);
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(28px, 4vw, 52px) 24px 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.footer-inner section {
  padding: 18px;
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.footer-inner section:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.footer-inner h2 {
  font-size: 1.05rem;
  padding-left: 14px;
  margin-bottom: 0.8rem;
}

.footer-inner h2::before {
  width: 4px;
}

.footer-inner p {
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
}

.footer-inner address p {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
  color: var(--text-soft);
}

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 24px 28px;
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-muted);
  border-top: 1px solid var(--card-border);
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 999;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0;
  color: #fff;
  background: var(--grad-btn);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(18px);
  transition: all var(--transition);
}

#back-to-top::after {
  content: "↑";
  font-size: 1.3rem;
  line-height: 52px;
  display: block;
  text-align: center;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: var(--shadow-lg);
}

#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ============ ANIMATIONS ============ */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatSoft {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.logo svg {
  animation: floatSoft 4s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .header-inner {
    padding: 10px 18px;
    gap: 12px;
  }

  #main-nav {
    order: 3;
    flex-basis: 100%;
  }

  #main-nav ul {
    justify-content: flex-start;
  }

  .site-search input {
    width: 140px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 64px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  #main-nav {
    display: none;
    flex-basis: 100%;
    padding: 8px 0 4px;
    border-top: 1px solid var(--card-border);
    animation: fadeUp 0.3s both;
  }

  #main-nav.is-open {
    display: block;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
  }

  #main-nav a {
    display: block;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
  }

  #menu-toggle {
    display: inline-block;
  }

  .site-search {
    flex: 1 1 100%;
    order: 4;
  }

  .site-search input {
    width: 100%;
    flex: 1;
  }

  .header-tools {
    flex: 1 1 100%;
    gap: 8px;
  }

  .hero {
    padding: 20px 16px 4px;
  }

  .hero-carousel {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .section {
    margin: 0 12px 18px;
    padding: 20px 16px;
    border-radius: var(--radius);
  }

  .hero-intro {
    border-radius: var(--radius);
  }

  .hero-anchors a {
    padding: 8px 15px;
    font-size: 0.84rem;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 22px 16px 8px;
  }

  #back-to-top {
    right: 14px;
    bottom: 18px;
    width: 46px;
    height: 46px;
  }

  #back-to-top::after {
    line-height: 46px;
  }
}

@media (max-width: 420px) {
  body {
    font-size: 15px;
  }

  .logo span {
    font-size: 1.05rem;
  }

  h2 {
    padding-left: 14px;
  }

  .news-item,
  .article-item {
    padding: 16px 16px 16px 20px;
  }

  #howto ol li {
    padding-left: 50px;
  }
}

@media (min-width: 1400px) {
  .header-inner,
  .hero,
  .section,
  .footer-inner,
  .footer-bottom {
    max-width: 1360px;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .hero-carousel,
  .hero-anchors {
    display: none;
  }

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

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