:root {
  --color-primary: #e94560;
  --color-primary-dark: #c73550;
  --color-secondary: #533483;
  --color-accent: #0f3460;
  --color-bg: #f7f7fb;
  --color-bg-alt: #ffffff;
  --color-text: #1a1a2e;
  --color-text-soft: #55556b;
  --color-border: rgba(26, 26, 46, 0.1);
  --color-header-bg: rgba(255, 255, 255, 0.72);
  --color-card-bg: rgba(255, 255, 255, 0.65);
  --color-shadow: rgba(26, 26, 46, 0.08);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #0f3460 45%, #533483 100%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-mode {
  --color-bg: #0d0d16;
  --color-bg-alt: #15151f;
  --color-text: #ececf2;
  --color-text-soft: #a5a5b8;
  --color-border: rgba(255, 255, 255, 0.12);
  --color-header-bg: rgba(13, 13, 22, 0.72);
  --color-card-bg: rgba(30, 30, 46, 0.55);
  --color-shadow: rgba(0, 0, 0, 0.4);
  --gradient-hero: linear-gradient(135deg, #0d0d16 0%, #12203a 45%, #2a1a4a 100%);
}

*,
*::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: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.08), transparent 42%),
    radial-gradient(circle at 88% 0%, rgba(83, 52, 131, 0.1), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(15, 52, 96, 0.08), transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

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

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
}

h2 {
  font-size: clamp(1.35rem, 2.8vw, 2rem);
}

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

p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text-soft);
}

ul,
ol {
  margin: 0 0 var(--space-sm);
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.4rem;
  color: var(--color-text-soft);
}

strong {
  color: var(--color-text);
}

blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-md);
  border-left: 4px solid var(--color-primary);
  background: var(--color-card-bg);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

blockquote p {
  margin-bottom: var(--space-xs);
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 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(--color-header-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  box-shadow: 0 6px 24px var(--color-shadow);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.28);
  transition: transform var(--transition);
}

.brand:hover .brand-logo {
  transform: rotate(-6deg) scale(1.05);
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

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

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

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: block;
  padding: 0.4rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: #fff;
  background: var(--gradient-accent);
  outline: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.3rem 0.2rem 0.9rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.18);
}

.site-search input {
  border: none;
  background: transparent;
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.85rem;
  width: 130px;
  padding: 0.35rem 0;
  outline: none;
}

.site-search input::placeholder {
  color: var(--color-text-soft);
  opacity: 0.7;
}

.site-search button {
  border: none;
  cursor: pointer;
  background: var(--gradient-accent);
  color: #fff;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  transition: filter var(--transition), transform var(--transition);
}

.site-search button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  color: var(--color-text);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 1.05rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

#menu-toggle {
  display: none;
}

/* ===== Main & Sections ===== */
#main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.breadcrumb {
  padding: var(--space-md) 0 0;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-text-soft);
  opacity: 0.6;
}

.breadcrumb a {
  color: var(--color-text-soft);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

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

.section {
  padding: var(--space-xl) 0 var(--space-lg);
  scroll-margin-top: 90px;
}

.section > h2 {
  position: relative;
  padding-bottom: 0.6rem;
  margin-bottom: var(--space-md);
}

.section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
}

.section > h3 {
  margin-top: var(--space-lg);
  color: var(--color-text);
}

.section > h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--gradient-accent);
  vertical-align: middle;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  margin: var(--space-md) 0 var(--space-lg);
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(26, 26, 46, 0.35);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  pointer-events: none;
}

.hero::before {
  width: 320px;
  height: 320px;
  top: -120px;
  right: -80px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.7), transparent 70%);
  animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
  width: 280px;
  height: 280px;
  bottom: -120px;
  left: -60px;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.8), transparent 70%);
  animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20px, 24px) scale(1.08); }
}

.hero-slider {
  position: relative;
  z-index: 1;
  min-height: 220px;
}

.hero .slide {
  display: none;
  animation: fadeSlide 0.7s ease both;
}

.hero .slide.active {
  display: block;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero h1,
.hero h2 {
  color: #fff;
  margin-bottom: var(--space-sm);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

.hero h1 {
  background: linear-gradient(120deg, #fff 30%, #ffb3c1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  max-width: 780px;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.stat {
  padding: var(--space-md) var(--space-sm);
  text-align: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition), background var(--transition);
}

.stat:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.18);
}

.stat-num {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.2;
  background: linear-gradient(120deg, #fff, #ffb3c1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  display: block;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 0.2rem;
}

/* ===== Timeline ===== */
.timeline {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
  opacity: 0.4;
  border-radius: var(--radius-pill);
}

.timeline li {
  position: relative;
  padding: 0.6rem 0 0.6rem 2rem;
  margin-bottom: 0.4rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 1.15rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15);
}

.timeline li:hover {
  background: var(--color-card-bg);
  transform: translateX(4px);
}

/* ===== Cards / Lists ===== */
.news-list,
.sitemap-list,
.friend-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-sm);
}

.news-list li {
  padding: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 18px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: baseline;
}

.news-list li:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 34px var(--color-shadow);
  border-color: rgba(233, 69, 96, 0.4);
}

.news-list time {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-pill);
  background: rgba(233, 69, 96, 0.1);
  white-space: nowrap;
}

.sitemap-list {
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

.sitemap-list a,
.friend-links a {
  display: block;
  padding: 0.7rem 1rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  transform: translateY(-3px);
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
}

.friend-links {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

/* ===== Articles ===== */
#articles > p {
  margin-bottom: var(--space-md);
}

.article-item {
  position: relative;
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 6px 22px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.article-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.article-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 44px var(--color-shadow);
  border-color: rgba(233, 69, 96, 0.35);
}

.article-item:hover::before {
  transform: scaleY(1);
}

.article-item h3 {
  margin-bottom: 0.3rem;
}

.article-meta {
  font-size: 0.82rem;
  color: var(--color-text-soft);
  opacity: 0.85;
  margin-bottom: 0.6rem;
}

.article-item a {
  display: inline-block;
  margin-top: 0.4rem;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background: rgba(233, 69, 96, 0.1);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.article-item a:hover {
  background: var(--gradient-accent);
  color: #fff;
  transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-item {
  margin-bottom: var(--space-sm);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 16px var(--color-shadow);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item[open] {
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: 0 12px 32px var(--color-shadow);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: var(--space-md);
  font-weight: 600;
  color: var(--color-text);
  position: relative;
  padding-right: 3rem;
  transition: color var(--transition), background var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 50%;
  color: var(--color-primary);
  background: rgba(233, 69, 96, 0.12);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

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

.faq-item summary:hover {
  color: var(--color-primary);
}

.faq-item p {
  padding: 0 var(--space-md) var(--space-md);
  margin: 0;
  animation: fadeSlide 0.4s ease both;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.contact-item {
  padding: var(--space-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 6px 20px var(--color-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px var(--color-shadow);
  border-color: rgba(233, 69, 96, 0.35);
}

.contact-item h3 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
  color: var(--color-primary);
}

.contact-item p {
  margin: 0;
  font-size: 0.92rem;
}

/* ===== Footer ===== */
#site-footer {
  margin-top: var(--space-xl);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.82);
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -80px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.35), transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  position: relative;
  z-index: 1;
}

.footer-brand p,
.footer-meta p,
.footer-legal p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
}

.footer-brand strong {
  color: #fff;
  font-size: 1.15rem;
}

.footer-inner h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  position: relative;
  padding-bottom: 0.4rem;
}

.footer-inner h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
}

.footer-meta,
.footer-legal {
  display: flex;
  flex-direction: column;
}

.footer-legal h3:not(:first-child) {
  margin-top: var(--space-md);
}

.footer-copy {
  grid-column: 1 / -1;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
}

.footer-copy p {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

#site-footer a {
  color: #ffb3c1;
}

#site-footer a:hover {
  color: #fff;
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 120;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

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

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

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

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

@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;
  }

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .header-inner {
    flex-wrap: wrap;
  }

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

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

@media (max-width: 860px) {
  .header-inner {
    gap: var(--space-sm);
    padding: 0.6rem var(--space-sm);
  }

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

  .site-search {
    display: none;
  }

  .main-nav {
    display: none;
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  .main-nav.open {
    display: block;
    max-height: 640px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0.2rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
  }

  .main-nav a {
    padding: 0.65rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
  }

  .hero {
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-md);
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .section {
    padding: var(--space-lg) 0 var(--space-md);
  }

  .article-item {
    padding: var(--space-md);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  #main-content {
    padding: 0 var(--space-sm);
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .hero {
    padding: var(--space-md);
  }

  .hero-slider {
    min-height: 260px;
  }

  .hero-stats {
    gap: 0.6rem;
  }

  .stat {
    padding: var(--space-sm) 0.4rem;
  }

  .stat-label {
    font-size: 0.72rem;
  }

  .sitemap-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .friend-links {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    width: 42px;
    height: 42px;
  }
}

/* ===== Focus visibility ===== */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* ===== Selection ===== */
::selection {
  background: rgba(233, 69, 96, 0.3);
  color: var(--color-text);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-pill);
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}