:root {
  --c-bg: #fff7f9;
  --c-bg-alt: #fff0f4;
  --c-surface: #ffffff;
  --c-surface-glass: rgba(255, 255, 255, 0.72);
  --c-border: #f3d3dc;
  --c-text: #4a3b41;
  --c-text-soft: #8a737c;
  --c-heading: #3a2b31;
  --c-primary: #f7a8b8;
  --c-primary-deep: #e87f96;
  --c-primary-soft: #fde8ec;
  --c-accent: #a8c8e8;
  --c-accent-soft: #e8f4fd;
  --c-gold: #e8c47a;
  --c-gold-soft: #fef7e0;
  --c-shadow: rgba(232, 127, 150, 0.16);
  --c-shadow-strong: rgba(232, 127, 150, 0.28);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --maxw: 1200px;
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.35s;
}

html[data-theme="dark"] {
  --c-bg: #1c161a;
  --c-bg-alt: #241b20;
  --c-surface: #2a2026;
  --c-surface-glass: rgba(42, 32, 38, 0.72);
  --c-border: #3d2c34;
  --c-text: #ece2e6;
  --c-text-soft: #b09aa3;
  --c-heading: #fbeef3;
  --c-primary: #f7a8b8;
  --c-primary-deep: #ff9db3;
  --c-primary-soft: #3a2730;
  --c-accent: #a8c8e8;
  --c-accent-soft: #22303d;
  --c-gold: #e8c47a;
  --c-gold-soft: #332c1c;
  --c-shadow: rgba(0, 0, 0, 0.4);
  --c-shadow-strong: rgba(0, 0, 0, 0.6);
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text);
  background-color: var(--c-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(247, 168, 184, 0.22), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(168, 200, 232, 0.2), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(232, 196, 122, 0.12), transparent 45%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

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

a:hover,
a:focus-visible {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--c-heading);
  line-height: 1.35;
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.01em;
}

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

h2 {
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  position: relative;
  padding-bottom: 0.5em;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 5px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
}

h3 {
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  margin-top: 1.4em;
}

p {
  margin: 0 0 1em;
}

ul, ol {
  padding-left: 1.3em;
}

li {
  margin-bottom: 0.4em;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.2em;
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--c-surface-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--c-text-soft);
  font-style: normal;
  box-shadow: 0 6px 20px var(--c-shadow);
}

blockquote p {
  margin: 0;
}

.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;
}

/* ============ HEADER ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-surface-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--c-border);
  box-shadow: 0 4px 24px var(--c-shadow);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.6rem 1.2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  color: var(--c-heading);
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover {
  text-decoration: none;
  color: var(--c-primary-deep);
}

.logo svg {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  box-shadow: 0 4px 14px var(--c-shadow-strong);
  transition: transform var(--dur) var(--ease);
}

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

.logo-text {
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  background: linear-gradient(120deg, var(--c-primary-deep), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

#main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

#main-nav a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  color: var(--c-text);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  background: var(--c-primary-soft);
  color: var(--c-primary-deep);
  transform: translateY(-2px);
  text-decoration: none;
}

#mobile-menu-toggle,
#theme-toggle {
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  font: inherit;
  font-size: 0.88rem;
  padding: 0.42rem 0.9rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#mobile-menu-toggle {
  display: none;
}

#mobile-menu-toggle:hover,
#theme-toggle:hover {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 6px 18px var(--c-shadow-strong);
  transform: translateY(-2px);
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 1 260px;
}

#site-search input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  font: inherit;
  font-size: 0.9rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text);
  outline: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#site-search input[type="search"]::placeholder {
  color: var(--c-text-soft);
}

#site-search input[type="search"]:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-shadow);
}

#site-search button[type="submit"] {
  font: inherit;
  font-size: 0.88rem;
  padding: 0.45rem 1rem;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  color: #fff;
  background: linear-gradient(120deg, var(--c-primary), var(--c-primary-deep));
  box-shadow: 0 4px 14px var(--c-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease);
}

#site-search button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px var(--c-shadow-strong);
  filter: brightness(1.05);
}

/* ============ LAYOUT ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.2rem 3rem;
}

section {
  margin: 2.2rem 0;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  border-radius: var(--radius-lg);
  background: var(--c-surface-glass);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--c-border);
  box-shadow: 0 10px 34px var(--c-shadow);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

section:hover {
  box-shadow: 0 16px 44px var(--c-shadow-strong);
}

/* ============ BREADCRUMB ============ */
#breadcrumb {
  margin: 1.2rem 0 0;
  padding: 0;
  background: none;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

#breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  font-size: 0.88rem;
  color: var(--c-text-soft);
}

#breadcrumb li + li::before {
  content: "›";
  margin-right: 0.4rem;
  color: var(--c-primary);
}

#breadcrumb a {
  color: var(--c-text-soft);
  text-decoration: none;
}

#breadcrumb a:hover {
  color: var(--c-primary-deep);
}

#breadcrumb [aria-current="page"] {
  color: var(--c-primary-deep);
  font-weight: 600;
}

/* ============ HERO ============ */
#hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(247, 168, 184, 0.9), rgba(168, 200, 232, 0.85) 55%, rgba(232, 196, 122, 0.8));
  color: #fff;
  border: none;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto auto;
  width: 60%;
  height: 180%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.4), transparent 62%);
  pointer-events: none;
  animation: heroFloat 12s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -30% -10%;
  width: 50%;
  height: 120%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), transparent 60%);
  pointer-events: none;
  animation: heroFloat 16s ease-in-out infinite alternate-reverse;
}

@keyframes heroFloat {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(-24px, 24px, 0) scale(1.08); }
}

#hero h1,
#hero h2,
#hero p {
  position: relative;
  z-index: 1;
  color: #fff;
  text-shadow: 0 2px 12px rgba(120, 60, 80, 0.28);
}

#hero h1::after {
  display: none;
}

#hero > p {
  max-width: 62ch;
  font-size: 1.02rem;
}

.hero-gallery {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
  margin: 1.6rem 0;
}

.hero-gallery figure {
  margin: 0;
  padding: 0.8rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 12px 30px rgba(120, 60, 80, 0.22);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.hero-gallery figure:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 44px rgba(120, 60, 80, 0.32);
}

.hero-gallery svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.hero-gallery figcaption {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: var(--c-text-soft);
  text-align: center;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}

.hero-stats > div {
  padding: 1rem 0.8rem;
  text-align: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 26px rgba(120, 60, 80, 0.2);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.hero-stats > div:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(120, 60, 80, 0.3);
}

.stat-number {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(120deg, var(--c-primary-deep), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stats span {
  display: block;
  font-size: 0.82rem;
  color: var(--c-text-soft);
  margin-top: 0.2rem;
}

/* ============ ARTICLES ============ */
#articles article {
  margin: 1rem 0;
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius-md);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  box-shadow: 0 6px 20px var(--c-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

#articles article:hover {
  transform: translateY(-6px);
  border-color: var(--c-primary);
  box-shadow: 0 16px 38px var(--c-shadow-strong);
}

#articles article h3 {
  margin-top: 0;
}

#articles article p {
  font-size: 0.92rem;
  color: var(--c-text-soft);
}

#articles article a {
  display: inline-block;
  font-weight: 600;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--c-primary-soft);
  color: var(--c-primary-deep);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#articles article a:hover {
  background: var(--c-primary);
  color: #fff;
  transform: translateX(4px);
  text-decoration: none;
}

/* ============ FAQ ============ */
#faq details {
  margin: 0.7rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  box-shadow: 0 6px 18px var(--c-shadow);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#faq details:hover {
  border-color: var(--c-primary);
  box-shadow: 0 12px 30px var(--c-shadow-strong);
}

#faq details[open] {
  border-color: var(--c-primary);
}

#faq summary {
  cursor: pointer;
  padding: 0.95rem 1.1rem;
  font-weight: 600;
  color: var(--c-heading);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

#faq summary::before {
  content: "+";
  flex-shrink: 0;
  width: 1.4em;
  height: 1.4em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-primary-soft);
  color: var(--c-primary-deep);
  font-weight: 800;
  line-height: 1;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

#faq details[open] summary::before {
  content: "−";
  background: var(--c-primary);
  color: #fff;
  transform: rotate(180deg);
}

#faq summary:hover {
  background: var(--c-primary-soft);
}

#faq details p {
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  font-size: 0.94rem;
  color: var(--c-text-soft);
  animation: faqReveal var(--dur) var(--ease);
}

@keyframes faqReveal {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ HOWTO ============ */
#howto h3 {
  position: relative;
  padding-left: 0.9rem;
}

#howto h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 6px;
  height: 1em;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--c-primary), var(--c-accent));
}

/* ============ SITEMAP / LINKS ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.5rem;
}

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

#sitemap a,
#links a {
  display: block;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#sitemap a:hover,
#links a:hover {
  background: linear-gradient(120deg, var(--c-primary), var(--c-primary-deep));
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 10px 24px var(--c-shadow-strong);
  text-decoration: none;
}

/* ============ CONTACT ============ */
#contact p {
  font-size: 0.95rem;
}

#contact h3 {
  color: var(--c-primary-deep);
}

/* ============ FOOTER ============ */
#site-footer {
  margin-top: 2rem;
  padding: 2.2rem 1.2rem;
  background: linear-gradient(160deg, rgba(247, 168, 184, 0.22), rgba(168, 200, 232, 0.2));
  border-top: 1px solid var(--c-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
  color: var(--c-text-soft);
  font-size: 0.88rem;
}

.footer-inner p {
  margin: 0.35rem 0;
}

.footer-inner a {
  color: var(--c-primary-deep);
  text-decoration: none;
}

.footer-inner a:hover {
  text-decoration: underline;
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 90;
  border: none;
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-pill);
  color: #fff;
  background: linear-gradient(120deg, var(--c-primary), var(--c-primary-deep));
  box-shadow: 0 10px 26px var(--c-shadow-strong);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

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

#back-to-top:hover {
  transform: translateY(-4px);
  filter: brightness(1.06);
}

/* ============ SCROLL ANIMATION ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 0.7rem;
  }
  #site-search {
    flex-basis: 200px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }
  .header-inner {
    align-items: center;
  }
  #mobile-menu-toggle {
    display: inline-block;
    order: 3;
    margin-left: auto;
  }
  #theme-toggle {
    order: 4;
  }
  #main-nav {
    order: 5;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease);
    opacity: 0;
  }
  #main-nav.is-open {
    max-height: 520px;
    opacity: 1;
  }
  #main-nav ul {
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.5rem 0;
  }
  #main-nav a {
    display: block;
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius-sm);
  }
  #site-search {
    order: 6;
    flex-basis: 100%;
    margin-top: 0.4rem;
  }
  .hero-gallery {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }
  main {
    padding: 0 0.85rem 2.4rem;
  }
  section {
    padding: 1.1rem;
    border-radius: var(--radius-md);
  }
  .logo-text {
    font-size: 1.05rem;
  }
  .logo svg {
    width: 40px;
    height: 40px;
  }
  .hero-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
  }
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
  }
  #back-to-top {
    right: 0.8rem;
    bottom: 0.8rem;
    padding: 0.5rem 0.85rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 360px) {
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }
}

/* ============ SELECTION & SCROLLBAR ============ */
::selection {
  background: var(--c-primary);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--c-primary), var(--c-primary-deep));
  border-radius: var(--radius-pill);
  border: 2px solid var(--c-bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-primary-deep);
}