:root {
  --brand: #6C3FB5;
  --brand-dark: #4E2C86;
  --brand-light: #8B5CF6;
  --accent: #FFD166;
  --accent-2: #FF6B9D;
  --accent-3: #4ECDC4;
  --bg: #F7F5FC;
  --bg-alt: #FFFFFF;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #FFFFFF;
  --text: #1F1633;
  --text-soft: #5B5470;
  --text-muted: #8A83A0;
  --border: rgba(108, 63, 181, 0.14);
  --shadow-sm: 0 2px 8px rgba(76, 42, 128, 0.08);
  --shadow-md: 0 10px 30px rgba(76, 42, 128, 0.12);
  --shadow-lg: 0 20px 50px rgba(76, 42, 128, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-banner: linear-gradient(135deg, #6C3FB5 0%, #9B5DE5 45%, #FF6B9D 100%);
  --gradient-soft: linear-gradient(135deg, rgba(108, 63, 181, 0.08), rgba(255, 107, 157, 0.08));
  --gradient-accent: linear-gradient(135deg, #FFD166, #FF6B9D);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --header-h: 72px;
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  --brand: #9B7BE0;
  --brand-dark: #7B5BC0;
  --brand-light: #B39DF0;
  --accent: #FFD166;
  --accent-2: #FF7BA9;
  --accent-3: #5EE0D6;
  --bg: #100C1C;
  --bg-alt: #171226;
  --surface: rgba(28, 22, 44, 0.72);
  --surface-solid: #1C1630;
  --text: #F2EEFB;
  --text-soft: #C4BCDA;
  --text-muted: #8F87A8;
  --border: rgba(155, 123, 224, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.55);
  --gradient-banner: linear-gradient(135deg, #2A1B4A 0%, #4B2A7A 45%, #7A2E5C 100%);
  --gradient-soft: linear-gradient(135deg, rgba(155, 123, 224, 0.1), rgba(255, 123, 169, 0.08));
}

*,
*::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-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(108, 63, 181, 0.10), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(255, 107, 157, 0.10), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(78, 205, 196, 0.08), transparent 45%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--accent-2);
}

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

h1, h2, h3, h4 {
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(1.65rem, 3.6vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.15rem, 1.9vw, 1.45rem); }
h4 { font-size: clamp(1rem, 1.4vw, 1.15rem); }

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

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

li {
  margin-bottom: 0.45em;
}

.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: 1000;
  background: var(--surface);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--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;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 6px 16px rgba(108, 63, 181, 0.35);
  transition: transform var(--transition);
}

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

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  background: var(--gradient-banner);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

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

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

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: inline-block;
  padding: 7px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: 999px;
  position: relative;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-list a:hover {
  color: var(--brand);
  background: var(--gradient-soft);
  transform: translateY(-1px);
}

.nav-list a:hover::after {
  width: 60%;
}

.site-search {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 4px 4px 14px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-search:focus-within {
  border-color: var(--brand-light);
  box-shadow: 0 0 0 4px rgba(108, 63, 181, 0.14);
}

.site-search input {
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.88rem;
  color: var(--text);
  width: 180px;
  padding: 6px 0;
}

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

.site-search button {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-banner);
  padding: 7px 16px;
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.site-search button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(108, 63, 181, 0.35);
  filter: brightness(1.06);
}

#theme-toggle {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-solid);
  font-size: 1.1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#theme-toggle:hover {
  transform: rotate(20deg) scale(1.08);
  box-shadow: 0 6px 18px rgba(108, 63, 181, 0.28);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 24px 0;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
}

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

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

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

/* ============ Banner / Hero ============ */
.banner {
  position: relative;
  max-width: 1280px;
  margin: 20px auto 0;
  padding: 0 24px;
  display: grid;
  gap: 18px;
}

.banner-slide {
  position: relative;
  border-radius: var(--radius-xl);
  padding: clamp(28px, 5vw, 64px) clamp(22px, 4vw, 56px);
  background: var(--gradient-banner);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.banner-slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgba(255, 209, 102, 0.35), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(78, 205, 196, 0.28), transparent 45%);
  z-index: -1;
  animation: bannerGlow 10s ease-in-out infinite alternate;
}

.banner-slide::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  filter: blur(2px);
  z-index: -1;
  pointer-events: none;
}

@keyframes bannerGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.08); }
}

.banner-slide h1,
.banner-slide h2 {
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
  max-width: 900px;
}

.banner-slide p {
  color: rgba(255, 255, 255, 0.92);
  max-width: 860px;
  font-size: clamp(0.95rem, 1.4vw, 1.08rem);
  line-height: 1.85;
}

.banner-slide .cta {
  display: inline-block;
  margin: 12px 12px 0 0;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  color: #3B1E6E;
  background: linear-gradient(135deg, #FFD166, #FFB84D);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.22);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.banner-slide .cta:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.3);
  filter: brightness(1.05);
  color: #3B1E6E;
}

.banner-slide .cta.secondary {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.banner-slide .cta.secondary:hover {
  background: rgba(255, 255, 255, 0.28);
  color: #fff;
}

.banner-slide[data-slide="2"],
.banner-slide[data-slide="3"] {
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(24px, 4vw, 44px);
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 4px 0 6px;
}

.banner-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--transition), transform var(--transition), width var(--transition);
}

.banner-dots .dot.active {
  width: 28px;
  border-radius: 999px;
  background: var(--gradient-accent);
  transform: scale(1.05);
}

/* ============ Stats ============ */
.stats {
  max-width: 1280px;
  margin: 24px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 22px 12px;
  border-radius: var(--radius-md);
  background: var(--surface);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-light);
}

.stat-item:hover::before {
  opacity: 1;
}

.stat-num {
  position: relative;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  background: var(--gradient-banner);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  position: relative;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

/* ============ Main sections ============ */
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

main > section {
  margin-top: 40px;
  padding: clamp(24px, 3.5vw, 44px);
  border-radius: var(--radius-lg);
  background: var(--surface);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(108, 63, 181, 0.28);
}

main > section > h2 {
  position: relative;
  padding-left: 18px;
  margin-bottom: 1.1em;
}

main > section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1.1em;
  border-radius: 4px;
  background: var(--gradient-accent);
  box-shadow: 0 0 14px rgba(255, 107, 157, 0.45);
}

main > section > h3 {
  margin-top: 1.6em;
  color: var(--brand);
}

html[data-theme="dark"] main > section > h3 {
  color: var(--brand-light);
}

main > section > h3:first-of-type {
  margin-top: 0.4em;
}

main > section h4 {
  margin-top: 1.3em;
  margin-bottom: 0.4em;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
  color: var(--text);
}

/* ============ Articles ============ */
#articles {
  display: grid;
  gap: 0;
}

#articles > h2,
#articles > p {
  grid-column: 1 / -1;
}

#articles > article {
  margin-top: 18px;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#articles > article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-banner);
  opacity: 0;
  transition: opacity var(--transition);
}

#articles > article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-light);
}

#articles > article:hover::before {
  opacity: 1;
}

#articles > article h3 {
  margin-top: 0;
  margin-bottom: 0.4em;
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
}

#articles > article .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.7em;
  letter-spacing: 0.02em;
}

#articles > article > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

#articles > article > a::after {
  content: "→";
  transition: transform var(--transition);
}

#articles > article > a:hover {
  background: var(--gradient-banner);
  color: #fff;
  transform: translateX(2px);
  box-shadow: 0 8px 20px rgba(108, 63, 181, 0.3);
}

#articles > article > a:hover::after {
  transform: translateX(3px);
}

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

#faq details:hover {
  border-color: var(--brand-light);
  box-shadow: var(--shadow-md);
}

#faq details[open] {
  border-color: var(--brand-light);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: background var(--transition), color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brand);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#faq details[open] summary {
  background: var(--gradient-soft);
  color: var(--brand);
}

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

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

#faq details > p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 0.94rem;
  line-height: 1.85;
  animation: fadeSlideIn 0.35s ease both;
}

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

/* ============ HowTo ============ */
#howto h4 {
  margin-top: 1.1em;
}

#howto ul {
  display: grid;
  gap: 4px;
}

/* ============ Contact ============ */
#contact p {
  margin-bottom: 0.35em;
}

#contact h3 {
  margin-top: 1.4em;
}

/* ============ Sitemap & Links ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

#sitemap a:hover,
#links a:hover {
  transform: translateY(-3px);
  background: var(--gradient-banner);
  color: #fff;
  box-shadow: 0 10px 24px rgba(108, 63, 181, 0.32);
}

/* ============ Footer ============ */
footer {
  margin-top: 40px;
  background: var(--gradient-banner);
  color: #fff;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 90% 0%, rgba(255, 209, 102, 0.22), transparent 45%),
    radial-gradient(circle at 5% 100%, rgba(78, 205, 196, 0.2), transparent 45%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 24px 28px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
}

.footer-inner h2,
.footer-inner h3 {
  color: #fff;
  margin-bottom: 0.7em;
}

.footer-inner h2 {
  font-size: 1.35rem;
}

.footer-inner h3 {
  font-size: 1.05rem;
}

.footer-inner p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.9rem;
  margin-bottom: 0.5em;
}

.footer-inner a {
  color: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.footer-inner a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.footer-bottom {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 24px 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

.footer-bottom p {
  margin: 0;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.72);
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-banner);
  box-shadow: 0 10px 26px rgba(108, 63, 181, 0.4);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  box-shadow: 0 16px 34px rgba(108, 63, 181, 0.55);
  filter: brightness(1.08);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  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: 1080px) {
  .header-inner {
    gap: 14px;
  }
  .nav-list a {
    padding: 6px 9px;
    font-size: 0.86rem;
  }
  .site-search input {
    width: 130px;
  }
}

@media (max-width: 900px) {
  .header-inner {
    padding: 10px 18px;
    min-height: auto;
    row-gap: 10px;
  }
  #site-header nav {
    order: 3;
    flex-basis: 100%;
  }
  .nav-list {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }
  .nav-list li {
    flex-shrink: 0;
  }
  .site-search {
    margin-left: auto;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
  .footer-about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }
  .header-inner {
    padding: 10px 14px;
    gap: 10px;
  }
  .brand-name {
    font-size: 1rem;
  }
  .logo {
    width: 34px;
    height: 34px;
  }
  .site-search {
    order: 4;
    flex-basis: 100%;
    width: 100%;
  }
  .site-search input {
    width: 100%;
    flex: 1;
  }
  #theme-toggle {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }
  .breadcrumb,
  .banner,
  .stats,
  main {
    padding-left: 14px;
    padding-right: 14px;
  }
  .banner {
    margin-top: 14px;
  }
  .banner-slide {
    border-radius: var(--radius-lg);
    padding: 26px 20px;
  }
  .banner-slide .cta {
    display: block;
    text-align: center;
    margin-right: 0;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 16px;
  }
  .stat-item {
    padding: 16px 8px;
  }
  main > section {
    margin-top: 22px;
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }
  main > section > h2 {
    padding-left: 14px;
  }
  #articles > article {
    padding: 18px 16px;
  }
  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.93rem;
  }
  #faq details > p {
    padding: 0 16px 16px;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 34px 16px 20px;
  }
  .footer-bottom {
    flex-direction: column;
    padding: 16px 16px 24px;
  }
  #back-to-top {
    right: 14px;
    bottom: 16px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 380px) {
  .stats {
    grid-template-columns: 1fr;
  }
  .nav-list a {
    font-size: 0.82rem;
    padding: 5px 8px;
  }
}

@media print {
  #site-header,
  .banner-dots,
  #back-to-top,
  #theme-toggle,
  .site-search,
  footer {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}