:root {
  --brand: #e63946;
  --brand-dark: #c1121f;
  --brand-light: #ff6b7a;
  --accent: #457b9d;
  --accent-2: #2a9d8f;
  --accent-3: #f4a261;
  --bg: #f7f8fc;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #555a63;
  --text-muted: #8a9099;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --shadow-sm: 0 2px 8px rgba(20, 24, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 24, 40, 0.1);
  --shadow-lg: 0 16px 48px rgba(20, 24, 40, 0.16);
  --shadow-brand: 0 8px 28px rgba(230, 57, 70, 0.32);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --header-h: 68px;
  --maxw: 1200px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --grad-brand: linear-gradient(135deg, #e63946 0%, #ff6b7a 45%, #f4a261 100%);
  --grad-cool: linear-gradient(135deg, #457b9d 0%, #2a9d8f 100%);
  --grad-warm: linear-gradient(135deg, #f4a261 0%, #e76f51 100%);
  --glass-blur: saturate(180%) blur(18px);
}

[data-theme="dark"] {
  --brand: #ff5c6c;
  --brand-dark: #e63946;
  --brand-light: #ff8a96;
  --bg: #0e1116;
  --bg-alt: #151a22;
  --surface: rgba(28, 34, 44, 0.66);
  --surface-solid: #1a2029;
  --text: #eef1f6;
  --text-secondary: #b6bdc9;
  --text-muted: #7d8695;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-brand: 0 8px 28px rgba(255, 92, 108, 0.28);
}

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

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;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
  background-image:
    radial-gradient(circle at 12% -8%, rgba(230, 57, 70, 0.1), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(69, 123, 157, 0.1), transparent 40%),
    radial-gradient(circle at 50% 120%, rgba(42, 157, 143, 0.08), transparent 46%);
  background-attachment: fixed;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 12% -8%, rgba(255, 92, 108, 0.14), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(69, 123, 157, 0.16), transparent 40%),
    radial-gradient(circle at 50% 120%, rgba(42, 157, 143, 0.12), transparent 46%);
}

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

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

a:hover {
  color: var(--brand-dark);
  opacity: 0.9;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

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

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--brand), var(--accent-2));
  border-radius: 10px;
  border: 2px solid var(--bg);
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== Header ===== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}

#site-header.scrolled {
  box-shadow: var(--shadow-md);
  background: var(--surface);
  border-bottom-color: var(--border-strong);
}

.header-inner {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
  font-weight: 800;
}

.brand-logo svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: var(--shadow-brand);
  transition: transform 0.5s var(--ease);
}

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

.brand-name {
  font-size: 1.15rem;
  letter-spacing: 0.4px;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.main-nav {
  margin-left: auto;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  display: inline-block;
  padding: 8px 13px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  background: var(--grad-brand);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width 0.3s var(--ease);
}

.main-nav a:hover {
  color: var(--brand);
  background: rgba(230, 57, 70, 0.08);
  transform: translateY(-1px);
}

.main-nav a:hover::after {
  width: 42%;
}

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

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-brand);
  background: var(--grad-brand);
  color: #fff;
  border-color: transparent;
}

#menu-toggle {
  display: none;
}

/* ===== Main ===== */
main {
  padding-top: var(--header-h);
}

.breadcrumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px 0;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

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

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

/* ===== Hero ===== */
.hero {
  position: relative;
  max-width: var(--maxw);
  margin: 22px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 36px;
  align-items: center;
}

.hero-slider {
  position: relative;
  aspect-ratio: 8 / 5;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--grad-brand);
  border: 1px solid var(--border);
}

.hero-slider::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.28));
  pointer-events: none;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.06);
  transition: opacity 0.9s var(--ease), transform 1.2s var(--ease);
}

.slide.active {
  opacity: 1;
  transform: scale(1);
  z-index: 2;
}

.slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
}

.hero-content h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 18px;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content > p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 26px;
  max-width: 56ch;
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 22px;
  border-radius: var(--radius-md);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-brand);
}

.stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--grad-cool);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-item span:last-child {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.cta-btn {
  display: inline-block;
  padding: 15px 40px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1.02rem;
  color: #fff;
  background: var(--grad-brand);
  background-size: 200% 200%;
  box-shadow: var(--shadow-brand);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background-position 0.6s var(--ease);
}

.cta-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 60%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: skewX(-20deg);
  transition: left 0.7s var(--ease);
}

.cta-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 38px rgba(230, 57, 70, 0.45);
  background-position: 100% 50%;
  color: #fff;
}

.cta-btn:hover::before {
  left: 130%;
}

/* ===== Sections ===== */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 24px;
}

.section h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.4px;
  margin-bottom: 28px;
  position: relative;
  padding-left: 20px;
  line-height: 1.3;
}

.section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
}

.section h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin: 26px 0 10px;
  color: var(--text);
  position: relative;
  padding-left: 15px;
}

.section h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--grad-cool);
}

.section p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.section > p {
  max-width: 78ch;
}

/* Cards for content blocks */
.section > h3 + p,
.section > p {
  padding: 0;
}

#intro,
#products,
#solutions,
#scenarios,
#howto {
  position: relative;
}

#intro::before,
#products::before,
#solutions::before,
#scenarios::before,
#howto::before {
  content: "";
  position: absolute;
  inset: 18px 8px;
  border-radius: var(--radius-xl);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  z-index: -1;
}

#intro,
#products,
#solutions,
#scenarios,
#howto {
  z-index: 1;
}

#products h3,
#solutions h3,
#scenarios h3 {
  background: linear-gradient(90deg, rgba(230, 57, 70, 0.08), transparent 70%);
  padding: 10px 16px 10px 16px;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

#products h3:hover,
#solutions h3:hover,
#scenarios h3:hover {
  transform: translateX(6px);
  background: linear-gradient(90deg, rgba(230, 57, 70, 0.16), transparent 80%);
  box-shadow: var(--shadow-sm);
}

#products h3::before,
#solutions h3::before,
#scenarios h3::before {
  display: none;
}

/* ===== Cases ===== */
#cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#cases h2 {
  grid-column: 1 / -1;
}

#cases h3 {
  margin: 0 0 10px;
  padding-left: 0;
  font-size: 1.05rem;
}

#cases h3::before {
  display: none;
}

#cases h3 + p {
  margin: 0;
}

#cases > h3,
#cases > p {
  grid-column: span 1;
}

#cases {
  align-items: start;
}

#cases h3,
#cases h3 + p {
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

#cases h3 {
  margin: 0;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom: none;
  padding-bottom: 6px;
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.1), rgba(69, 123, 157, 0.08));
  font-weight: 700;
}

#cases h3 + p {
  margin: -1px 0 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  border-top: none;
  padding-top: 12px;
  color: var(--text-secondary);
}

#cases h3:hover,
#cases h3 + p:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

/* ===== Testimonials ===== */
#testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

#testimonials h2 {
  grid-column: 1 / -1;
}

#testimonials blockquote {
  position: relative;
  padding: 30px 24px 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

#testimonials blockquote::before {
  content: "\201C";
  position: absolute;
  top: 2px;
  left: 16px;
  font-size: 3.6rem;
  line-height: 1;
  font-family: Georgia, serif;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.85;
}

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

#testimonials blockquote p {
  font-size: 0.96rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

#testimonials blockquote footer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand);
}

/* ===== News / Articles ===== */
#news,
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

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

.news-item,
.article-item {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}

.news-item::before,
.article-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease);
}

.news-item:hover,
.article-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.news-item:hover::before,
.article-item:hover::before {
  transform: scaleX(1);
}

.news-item h3,
.article-item h3 {
  margin: 0 0 8px;
  padding-left: 0;
  font-size: 1.05rem;
  line-height: 1.45;
}

.news-item h3::before,
.article-item h3::before {
  display: none;
}

.news-item time,
.article-item time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(69, 123, 157, 0.1);
}

.news-item p,
.article-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.news-item a,
.article-item a {
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.news-item a::after,
.article-item a::after {
  content: "→";
  transition: transform 0.3s var(--ease);
}

.news-item a:hover::after,
.article-item a:hover::after {
  transform: translateX(5px);
}

/* ===== HowTo ===== */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin: 18px 0;
  padding: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 58px;
  border-radius: var(--radius-md);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  color: var(--text-secondary);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
}

#howto ol li:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

/* ===== FAQ ===== */
#faq {
  display: grid;
  gap: 14px;
}

#faq h2 {
  margin-bottom: 14px;
}

.faq-item {
  border-radius: var(--radius-md);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.35s var(--ease), border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.faq-item h3 {
  margin: 0;
  padding: 18px 22px 18px 48px;
  font-size: 1rem;
  cursor: pointer;
  position: relative;
  color: var(--text);
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}

.faq-item h3::before {
  content: "Q";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-brand);
  transition: transform 0.4s var(--ease);
}

.faq-item:hover h3 {
  background: linear-gradient(90deg, rgba(230, 57, 70, 0.08), transparent);
  color: var(--brand);
}

.faq-item:hover h3::before {
  transform: translateY(-50%) rotate(-10deg) scale(1.08);
}

.faq-item p {
  padding: 0 22px 20px 48px;
  margin: 0;
  font-size: 0.93rem;
  color: var(--text-secondary);
  position: relative;
}

.faq-item p::before {
  content: "A";
  position: absolute;
  left: 18px;
  top: 3px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-cool);
}

/* ===== Contact ===== */
#contact {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 26px;
  align-items: start;
}

#contact h2 {
  grid-column: 1 / -1;
}

.contact-info,
.contact-map {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.contact-info:hover,
.contact-map:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.contact-info h3 {
  margin-top: 0;
}

.contact-info p {
  font-size: 0.93rem;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}

.contact-info p:last-child {
  border-bottom: none;
}

.contact-map svg {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* ===== Sitemap & Links ===== */
.sitemap-list,
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sitemap-list li a,
.friend-links li a {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), color 0.3s var(--ease), background 0.3s var(--ease);
}

.sitemap-list li a:hover,
.friend-links li a:hover {
  transform: translateY(-3px);
  color: #fff;
  background: var(--grad-brand);
  border-color: transparent;
  box-shadow: var(--shadow-brand);
}

/* ===== Footer ===== */
footer {
  margin-top: 60px;
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 52px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: 32px;
}

.footer-brand h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-brand p {
  font-size: 0.88rem;
  margin-bottom: 6px;
}

footer h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

footer h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 3px;
  background: var(--grad-brand);
}

.footer-links ul,
.footer-legal ul {
  display: grid;
  gap: 10px;
}

.footer-links a,
.footer-legal a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 0;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.footer-links a::before,
.footer-legal a::before {
  content: "›";
  position: absolute;
  left: -12px;
  opacity: 0;
  color: var(--brand);
  transition: opacity 0.25s var(--ease), left 0.25s var(--ease);
}

.footer-links a:hover,
.footer-legal a:hover {
  color: var(--brand);
  padding-left: 12px;
}

.footer-links a:hover::before,
.footer-legal a:hover::before {
  opacity: 1;
  left: 0;
}

.footer-meta p {
  font-size: 0.84rem;
  margin-bottom: 6px;
}

.footer-bottom {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px 32px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: grid;
  gap: 6px;
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease), visibility 0.4s var(--ease);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-5px) scale(1.08);
  box-shadow: 0 14px 38px rgba(230, 57, 70, 0.5);
}

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  will-change: opacity, transform;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .hero-slider {
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    margin: 0;
    padding: 16px;
    background: var(--surface);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s var(--ease);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .main-nav.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .main-nav a {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.98rem;
  }

  .main-nav a::after {
    display: none;
  }

  #menu-toggle {
    display: grid;
  }

  .brand-name {
    font-size: 1.02rem;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .breadcrumb {
    padding: 14px 16px 0;
    font-size: 0.8rem;
  }

  .hero {
    padding: 0 16px;
    margin-top: 16px;
  }

  .hero-stats {
    gap: 12px;
  }

  .stat-item {
    padding: 12px 16px;
    flex: 1 1 auto;
    min-width: 100px;
  }

  .stat-num {
    font-size: 1.35rem;
  }

  .cta-btn {
    width: 100%;
    text-align: center;
    padding: 14px 24px;
  }

  .section {
    padding: 44px 16px;
  }

  #intro::before,
  #products::before,
  #solutions::before,
  #scenarios::before,
  #howto::before {
    inset: 12px 4px;
  }

  .section h2 {
    padding-left: 16px;
    margin-bottom: 22px;
  }

  #cases,
  #testimonials,
  #news,
  #articles {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 26px;
    padding: 40px 16px 26px;
  }

  .footer-bottom {
    padding: 18px 16px 28px;
  }

  #back-to-top {
    right: 16px;
    bottom: 18px;
    width: 44px;
    height: 44px;
  }

  .faq-item h3 {
    padding: 16px 18px 16px 44px;
    font-size: 0.95rem;
  }

  .faq-item p {
    padding: 0 18px 18px 44px;
  }
}

@media (max-width: 380px) {
  .brand-name {
    display: none;
  }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

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

/* ===== Print ===== */
@media print {
  #site-header,
  #back-to-top,
  .hero-slider,
  .contact-map {
    display: none !important;
  }

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

  main {
    padding-top: 0;
  }

  .section {
    padding: 20px 0;
    page-break-inside: avoid;
  }
}