:root {
  --brand: #ff5a5f;
  --brand-dark: #e04b50;
  --brand-light: #ff8a8e;
  --accent: #ffd166;
  --mint: #06d6a0;
  --blue: #118ab2;
  --pink: #ef476f;
  --deep: #073b4c;
  --bg: #f7f8fc;
  --bg-alt: #ffffff;
  --bg-soft: #eef1f8;
  --text: #1a1d26;
  --text-soft: #5a6072;
  --text-mute: #8b90a0;
  --border: rgba(26, 29, 38, 0.08);
  --glass: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);
  --shadow-sm: 0 2px 8px rgba(26, 29, 38, 0.06);
  --shadow: 0 8px 28px rgba(26, 29, 38, 0.1);
  --shadow-lg: 0 18px 50px rgba(26, 29, 38, 0.16);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --header-h: 68px;
  --max-w: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.32s var(--ease);
}

html[data-theme="dark"] {
  --bg: #0e1117;
  --bg-alt: #161a23;
  --bg-soft: #1c212c;
  --text: #eef1f8;
  --text-soft: #b6bccb;
  --text-mute: #7d8496;
  --border: rgba(255, 255, 255, 0.09);
  --glass: rgba(22, 26, 35, 0.72);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.6);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 90, 95, 0.1), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(17, 138, 178, 0.1), transparent 45%),
    radial-gradient(circle at 50% 96%, rgba(6, 214, 160, 0.08), transparent 48%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

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

ul,
ol {
  list-style: none;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

.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: 900;
  background: var(--glass);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition), box-shadow var(--transition);
}

#site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text);
  flex-shrink: 0;
}

.brand svg {
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(255, 90, 95, 0.35);
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.brand span {
  background: linear-gradient(120deg, var(--brand), var(--pink) 60%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

#primary-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

#primary-nav a {
  display: block;
  padding: 7px 11px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-soft);
  border-radius: 999px;
  white-space: nowrap;
  transition: color var(--transition), background-color var(--transition), transform var(--transition);
}

#primary-nav a:hover {
  color: var(--brand);
  background: rgba(255, 90, 95, 0.1);
  transform: translateY(-2px);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 3px 3px 14px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

#site-search:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(255, 90, 95, 0.16);
}

#search-input {
  border: none;
  background: transparent;
  width: 150px;
  padding: 6px 0;
  font-size: 0.86rem;
  outline: none;
}

#search-input::placeholder {
  color: var(--text-mute);
}

#site-search button {
  padding: 7px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--pink));
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition);
}

#site-search button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 18px rgba(255, 90, 95, 0.4);
}

#theme-toggle,
#menu-toggle {
  padding: 8px 14px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  white-space: nowrap;
  transition: color var(--transition), background-color var(--transition), transform var(--transition);
}

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

#menu-toggle {
  display: none;
}

/* ============ MAIN LAYOUT ============ */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px 60px;
}

main > section {
  margin-top: 56px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

section > h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.4px;
  line-height: 1.3;
  margin-bottom: 20px;
  position: relative;
  padding-left: 18px;
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
}

section h3 {
  font-size: 1.16rem;
  font-weight: 700;
  color: var(--text);
  margin: 26px 0 10px;
  line-height: 1.4;
}

section p {
  color: var(--text-soft);
  margin-bottom: 14px;
}

section ul:not(#primary-nav ul):not(.banner-controls) {
  display: grid;
  gap: 10px;
}

section ul:not(#primary-nav ul):not(.banner-controls) > li {
  position: relative;
  padding: 12px 16px 12px 40px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

section ul:not(#primary-nav ul):not(.banner-controls) > li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
}

section ul:not(#primary-nav ul):not(.banner-controls) > li:hover {
  transform: translateX(6px);
  border-color: rgba(255, 90, 95, 0.35);
  box-shadow: var(--shadow);
}

section ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
}

section ol > li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 58px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

section ol > li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--pink));
}

section ol > li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* ============ BREADCRUMB ============ */
#breadcrumb {
  margin-top: 20px;
  padding: 12px 18px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-mute);
}

#breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-mute);
}

#breadcrumb a {
  color: var(--text-soft);
  font-weight: 600;
}

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

#breadcrumb [aria-current="page"] {
  color: var(--brand);
  font-weight: 700;
}

/* ============ HERO ============ */
#hero {
  position: relative;
  margin-top: 28px;
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 52px);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(255, 90, 95, 0.94), rgba(239, 71, 111, 0.9) 40%, rgba(17, 138, 178, 0.92)),
    var(--bg-alt);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  color: #fff;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 209, 102, 0.55), transparent 65%);
  filter: blur(10px);
  animation: floatBlob 12s ease-in-out infinite;
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -35% -8%;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 214, 160, 0.5), transparent 68%);
  filter: blur(12px);
  animation: floatBlob 15s ease-in-out infinite reverse;
  pointer-events: none;
}

@keyframes floatBlob {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-28px, 26px, 0) scale(1.08); }
}

#hero-title {
  position: relative;
  z-index: 2;
  font-size: clamp(1.6rem, 4vw, 2.7rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.6px;
  margin-bottom: 18px;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

#hero > p {
  position: relative;
  z-index: 2;
  max-width: 860px;
  font-size: clamp(0.94rem, 1.4vw, 1.05rem);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.94);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.14);
}

/* ============ BANNER SLIDER ============ */
#hero-banner {
  position: relative;
  z-index: 2;
  margin-top: 30px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
}

#hero-banner .slide {
  display: none;
  animation: slideIn 0.6s var(--ease);
}

#hero-banner .slide.is-active {
  display: block;
}

#hero-banner .slide svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(28px) scale(0.99); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

.banner-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 14px;
  background: rgba(0, 0, 0, 0.14);
}

.banner-controls button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 0.82rem;
  font-weight: 800;
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: transform var(--transition), background-color var(--transition);
}

.banner-controls button:hover,
.banner-controls button.is-active {
  background: var(--accent);
  color: var(--deep);
  transform: scale(1.12);
}

/* ============ STATS ============ */
#stats {
  padding: clamp(22px, 3.5vw, 40px);
  border-radius: var(--radius-lg);
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
}

#stats ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

#stats ul > li {
  padding: 22px 16px;
  text-align: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-soft);
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

#stats ul > li::before {
  display: none;
}

#stats ul > li:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

#stats strong {
  display: block;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 6px;
  background: linear-gradient(120deg, var(--brand), var(--pink) 55%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============ CARDS / CONTENT SECTIONS ============ */
#brand,
#products,
#advantages,
#solutions,
#scenes,
#cases,
#testimonials,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal,
#meta-info {
  padding: clamp(22px, 3.5vw, 40px);
  border-radius: var(--radius-lg);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

#brand:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#scenes:hover,
#cases:hover,
#testimonials:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover {
  box-shadow: var(--shadow);
}

#advantages ul {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

#advantages ul > li strong {
  color: var(--text);
  font-weight: 800;
}

/* ============ NEWS & ARTICLES ============ */
#news article,
#articles article {
  padding: 20px 22px;
  margin-bottom: 14px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 90, 95, 0.3);
  box-shadow: var(--shadow);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  color: var(--text);
}

#news article time,
#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--brand);
  background: rgba(255, 90, 95, 0.1);
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  font-weight: 700;
  font-size: 0.9rem;
}

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

#articles article a:hover::after {
  transform: translateX(5px);
}

/* ============ TESTIMONIALS ============ */
#testimonials blockquote {
  position: relative;
  padding: 24px 24px 20px 30px;
  margin-bottom: 16px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 90, 95, 0.07), rgba(17, 138, 178, 0.07));
  border: 1px solid var(--border);
  border-left: 5px solid var(--brand);
  transition: transform var(--transition), box-shadow var(--transition);
}

#testimonials blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
}

#testimonials blockquote p {
  font-size: 1.02rem;
  color: var(--text);
  font-style: italic;
  margin-bottom: 12px;
}

#testimonials blockquote footer {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-mute);
}

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

#faq details[open] {
  border-color: rgba(255, 90, 95, 0.35);
  box-shadow: var(--shadow);
}

#faq summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition), background-color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--pink));
  transition: transform var(--transition);
}

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

#faq summary:hover {
  color: var(--brand);
  background: rgba(255, 90, 95, 0.06);
}

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  color: var(--text-soft);
  animation: fadeUp 0.4s var(--ease);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ CONTACT ============ */
#contact address {
  font-style: normal;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

#contact address p {
  margin-bottom: 8px;
  color: var(--text-soft);
}

#contact address strong {
  color: var(--text);
}

/* ============ SITEMAP & LINKS ============ */
#sitemap ul,
#links ul {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

#sitemap ul > li::before,
#links ul > li::before {
  display: none;
}

#sitemap ul > li,
#links ul > li {
  padding: 12px 16px;
  text-align: center;
  font-weight: 600;
}

#sitemap a,
#links a {
  color: var(--text-soft);
  font-weight: 700;
}

#sitemap a:hover,
#links a:hover {
  color: var(--brand);
}

/* ============ LEGAL ============ */
#legal h3 {
  color: var(--brand);
}

/* ============ META INFO ============ */
#meta-info p {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 16px;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

#meta-info strong {
  color: var(--text);
  min-width: 80px;
}

/* ============ FOOTER ============ */
#site-footer {
  margin-top: 40px;
  padding: 44px 20px 32px;
  background: linear-gradient(160deg, var(--deep), #0b1f2b 70%);
  color: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  inset: -60% auto auto -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 95, 0.35), transparent 68%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}

.footer-inner p {
  margin-bottom: 10px;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.75);
}

.footer-inner a {
  color: var(--accent);
  font-weight: 700;
}

.footer-inner a:hover {
  color: #fff;
}

.footer-inner nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  margin-top: 18px;
}

.footer-inner nav a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.86rem;
  font-weight: 600;
  transition: color var(--transition), transform var(--transition);
  display: inline-block;
}

.footer-inner nav a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 950;
  padding: 12px 18px;
  font-size: 0.84rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--pink));
  border-radius: 999px;
  box-shadow: 0 12px 30px rgba(255, 90, 95, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(18px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 16px 38px rgba(255, 90, 95, 0.55);
}

/* ============ SCROLL REVEAL ============ */
.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);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1080px) {
  #search-input {
    width: 110px;
  }
  #primary-nav a {
    padding: 6px 8px;
    font-size: 0.82rem;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 62px;
  }

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

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

  #primary-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease), opacity 0.3s var(--ease);
    opacity: 0;
  }

  #primary-nav.is-open {
    max-height: 640px;
    opacity: 1;
    overflow-y: auto;
  }

  #primary-nav ul {
    flex-direction: column;
    padding: 10px 0 6px;
    gap: 2px;
  }

  #primary-nav a {
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
  }

  .header-tools {
    margin-left: auto;
  }

  #site-search {
    padding-left: 12px;
  }

  #search-input {
    width: 120px;
  }

  main {
    padding: 0 16px 48px;
  }

  main > section {
    margin-top: 40px;
  }
}

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

  .header-inner {
    padding: 8px 12px;
  }

  .brand {
    font-size: 1.15rem;
  }

  .brand svg {
    width: 34px;
    height: 34px;
  }

  #site-search {
    display: none;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 11px;
    font-size: 0.78rem;
  }

  main {
    padding: 0 12px 40px;
  }

  #hero {
    padding: 24px 18px;
    border-radius: var(--radius-lg);
  }

  #hero-banner {
    border-radius: var(--radius);
  }

  section > h2 {
    font-size: 1.3rem;
    padding-left: 14px;
  }

  section > h2::before {
    width: 5px;
  }

  section h3 {
    font-size: 1.05rem;
  }

  #stats ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  #stats ul > li {
    padding: 16px 10px;
    font-size: 0.82rem;
  }

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

  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.94rem;
  }

  #faq summary::after {
    right: 14px;
    width: 24px;
    height: 24px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 14px;
    font-size: 0.78rem;
  }

  #site-footer {
    padding: 34px 16px 26px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
}

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

/* ============ MOTION PREFERENCE ============ */
@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;
  }
}

/* ============ PRINT ============ */
@media print {
  #site-header,
  #back-to-top,
  #hero-banner,
  #site-footer {
    display: none;
  }

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

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