:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #4a90e2;
  --accent: #ff6b6b;
  --accent-light: #ff8e8e;
  --gradient-1: linear-gradient(135deg, #1a73e8 0%, #4a90e2 50%, #7c3aed 100%);
  --gradient-2: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-3: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-hero: linear-gradient(135deg, #e8f0fe 0%, #d4e4fc 30%, #e0d4fc 70%, #fce4ec 100%);
  --bg-body: #f5f7fb;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-solid: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.65);
  --bg-header: rgba(255, 255, 255, 0.78);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #7a7a9a;
  --text-inverse: #ffffff;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(26, 115, 232, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 115, 232, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 115, 232, 0.14);
  --shadow-glow: 0 0 24px rgba(26, 115, 232, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  --max-width: 1200px;
  --header-height: 72px;
}

[data-theme="dark"] {
  --primary: #5b9bf5;
  --primary-dark: #4a8ae0;
  --primary-light: #7cb3ff;
  --accent: #ff7b7b;
  --gradient-1: linear-gradient(135deg, #1a3a6e 0%, #2a4a8e 50%, #4a2a7e 100%);
  --gradient-2: linear-gradient(135deg, #3a2a6e 0%, #5a3a8e 100%);
  --gradient-3: linear-gradient(135deg, #6e2a5e 0%, #8e3a4e 100%);
  --gradient-hero: linear-gradient(135deg, #0f1a2e 0%, #1a2a4e 30%, #2a1a3e 70%, #3e1a2e 100%);
  --bg-body: #0d1117;
  --bg-card: rgba(22, 27, 40, 0.72);
  --bg-card-solid: #161b28;
  --bg-glass: rgba(22, 27, 40, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --bg-header: rgba(13, 17, 23, 0.82);
  --text-primary: #e8eaf0;
  --text-secondary: #b0b8d0;
  --text-muted: #7a829a;
  --text-inverse: #ffffff;
  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(91, 155, 245, 0.2);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-body);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(26, 115, 232, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(124, 58, 237, 0.06), transparent),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(255, 107, 107, 0.05), transparent);
  background-attachment: fixed;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(91, 155, 245, 0.06), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(124, 58, 237, 0.05), transparent),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(255, 123, 123, 0.04), transparent);
}

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

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

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

[data-theme="dark"] a:hover {
  color: var(--primary-light);
}

ul, ol {
  list-style: none;
}

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

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--primary);
  color: var(--text-inverse);
}

/* ========== HEADER ========== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-header);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.brand-logo:hover {
  transform: scale(1.04);
}

.brand-logo svg {
  border-radius: var(--radius-sm);
  filter: drop-shadow(0 2px 6px rgba(26, 115, 232, 0.3));
  transition: filter var(--transition-fast);
}

.brand-logo:hover svg {
  filter: drop-shadow(0 4px 12px rgba(26, 115, 232, 0.5));
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

#main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

#main-nav a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--gradient-1);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

#main-nav a:hover {
  color: var(--primary);
  background: rgba(26, 115, 232, 0.08);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

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

#site-search {
  display: flex;
  align-items: center;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

#site-search input {
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text-primary);
  outline: none;
  width: 160px;
  transition: width var(--transition-base);
}

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

#site-search input:focus {
  width: 200px;
}

#site-search button {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-inverse);
  background: var(--gradient-1);
  border-radius: var(--radius-full);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

#site-search button:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  font-size: 1.1rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#theme-toggle:hover,
#menu-toggle:hover {
  background: rgba(26, 115, 232, 0.12);
  transform: scale(1.08);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
}

/* ========== MAIN ========== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + 24px) 24px 60px;
}

/* ========== HERO ========== */
#hero {
  position: relative;
  padding: 80px 48px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  overflow: hidden;
  margin-bottom: 40px;
  box-shadow: var(--shadow-lg);
  animation: heroFadeIn 0.8s ease-out both;
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.15), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 8s ease-in-out infinite;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.1), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 10s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

#hero h1 {
  position: relative;
  z-index: 1;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

[data-theme="dark"] #hero h1 {
  color: #e8eaf0;
}

.hero-lead {
  position: relative;
  z-index: 1;
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 780px;
  margin-bottom: 32px;
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  color: var(--text-inverse);
  background: var(--gradient-1);
  box-shadow: 0 4px 16px rgba(26, 115, 232, 0.35);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 28px rgba(26, 115, 232, 0.45);
  color: var(--text-inverse);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-secondary {
  color: var(--primary);
  background: var(--bg-glass);
  border: 2px solid var(--primary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 28px rgba(26, 115, 232, 0.2);
  background: rgba(26, 115, 232, 0.08);
  color: var(--primary);
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 12px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.stat .num {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat .label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ========== BREADCRUMB ========== */
#breadcrumb {
  margin-bottom: 32px;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}

#breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

#breadcrumb li + li::before {
  content: '/';
  color: var(--text-muted);
  opacity: 0.5;
}

#breadcrumb a {
  color: var(--primary);
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

#breadcrumb a:hover {
  opacity: 0.75;
}

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

/* ========== SECTIONS ========== */
section {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

section > h2 {
  font-size: clamp(1.4rem, 2.8vw, 1.85rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 14px;
  position: relative;
  letter-spacing: -0.01em;
}

section > h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: var(--gradient-1);
  border-radius: 4px;
}

section > h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  line-height: 1.4;
}

section > h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 20px 0 8px;
}

section > p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.85;
}

section > ul {
  margin: 12px 0 20px;
  padding-left: 0;
}

section > ul li {
  position: relative;
  padding: 8px 0 8px 28px;
  color: var(--text-secondary);
  line-height: 1.75;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

section > ul li::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-1);
  box-shadow: 0 0 6px rgba(26, 115, 232, 0.4);
}

section > ul li:hover {
  transform: translateX(4px);
  color: var(--text-primary);
}

/* ========== ABOUT ========== */
#about {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

#about:hover {
  box-shadow: var(--shadow-md);
}

#about h3 {
  margin-top: 32px;
}

#about h3:first-of-type {
  margin-top: 0;
}

/* ========== PRODUCTS ========== */
#products {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

#products:hover {
  box-shadow: var(--shadow-md);
}

#products h4 {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(26, 115, 232, 0.08);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.95rem;
  margin-top: 24px;
}

/* ========== SOLUTIONS ========== */
#solutions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

#solutions > h2 {
  grid-column: 1 / -1;
}

#solutions > p {
  grid-column: 1 / -1;
}

#solutions > h3 {
  grid-column: 1 / -1;
  margin-top: 8px;
}

#solutions > h4 {
  grid-column: 1 / -1;
  margin-top: 12px;
}

#solutions > h3 ~ h4 {
  grid-column: auto;
}

#solutions > h3 ~ p {
  grid-column: auto;
}

/* ========== CASES ========== */
#cases {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#cases h3 {
  padding: 16px 20px;
  background: rgba(26, 115, 232, 0.05);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  margin-top: 24px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#cases h3:hover {
  background: rgba(26, 115, 232, 0.1);
  transform: translateX(4px);
}

#cases h3:first-of-type {
  margin-top: 0;
}

blockquote {
  position: relative;
  margin: 20px 0;
  padding: 24px 28px 24px 56px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote::before {
  content: '"';
  position: absolute;
  left: 18px;
  top: 8px;
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  opacity: 0.6;
}

blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.8;
}

/* ========== NEWS ========== */
#news {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#news h3 {
  margin-top: 28px;
}

#news h3:first-of-type {
  margin-top: 0;
}

#news time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 2px 12px;
  background: rgba(26, 115, 232, 0.08);
  border-radius: var(--radius-full);
  margin-bottom: 8px;
}

/* ========== ARTICLES ========== */
#articles {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#articles > p {
  margin-bottom: 28px;
}

#articles article {
  position: relative;
  padding: 24px 28px;
  margin-bottom: 18px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

#articles article::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-1);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-base);
  border-radius: 0 4px 4px 0;
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 115, 232, 0.2);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin: 0 0 8px;
  padding-left: 0;
  border-left: none;
  font-size: 1.1rem;
  transition: color var(--transition-fast);
}

#articles article:hover h3 {
  color: var(--primary);
}

#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

#articles article p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.75;
  margin-bottom: 12px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

#articles article a:hover {
  gap: 10px;
}

#articles article a:hover::after {
  transform: translateX(4px);
}

/* ========== FAQ ========== */
#faq {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#faq details {
  margin-bottom: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

#faq details:hover {
  border-color: rgba(26, 115, 232, 0.2);
  box-shadow: var(--shadow-sm);
}

#faq details[open] {
  border-color: rgba(26, 115, 232, 0.3);
  box-shadow: var(--shadow-sm);
}

#faq summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

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

#faq summary::after {
  content: '+';
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--primary);
  background: rgba(26, 115, 232, 0.08);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-fast);
}

#faq details[open] summary::after {
  content: '−';
  transform: rotate(180deg);
  background: var(--primary);
  color: var(--text-inverse);
}

#faq summary:hover {
  color: var(--primary);
  background: rgba(26, 115, 232, 0.04);
}

#faq details p {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.93rem;
  animation: faqSlideDown 0.3s ease-out;
}

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

/* ========== HOWTO ========== */
#howto {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#howto h4 {
  margin-top: 24px;
  padding: 12px 18px;
  background: rgba(26, 115, 232, 0.06);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  color: var(--primary);
  font-size: 0.98rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#howto h4:hover {
  background: rgba(26, 115, 232, 0.12);
  transform: translateX(4px);
}

#howto h3:first-of-type {
  margin-top: 0;
}

/* ========== CONTACT ========== */
#contact {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#contact p {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-bottom: 1px dashed var(--border-color);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

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

#contact p:hover {
  color: var(--primary);
  padding-left: 8px;
}

#contact h3 {
  margin-top: 28px;
}

#contact h3:first-of-type {
  margin-top: 0;
}

/* ========== SITEMAP ========== */
#sitemap {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

#sitemap li {
  padding: 0;
}

#sitemap li::before {
  display: none;
}

#sitemap a {
  display: block;
  padding: 12px 18px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  transition: all var(--transition-fast);
}

#sitemap a:hover {
  background: var(--gradient-1);
  color: var(--text-inverse);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.3);
}

/* ========== LINKS ========== */
#links {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#links li {
  padding: 0;
}

#links li::before {
  display: none;
}

#links a {
  display: inline-block;
  padding: 10px 22px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#links a:hover {
  background: var(--gradient-1);
  color: var(--text-inverse);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(26, 115, 232, 0.3);
}

/* ========== LEGAL ========== */
#legal {
  padding: 40px 36px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

#legal h3 {
  margin-top: 24px;
}

#legal h3:first-of-type {
  margin-top: 0;
}

/* ========== FOOTER ========== */
#site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--bg-glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 40px 24px;
  margin-top: 20px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-inner p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.9;
}

.footer-inner p:first-child {
  font-size: 1rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

/* ========== BACK TO TOP ========== */
#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--text-inverse);
  background: var(--gradient-1);
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px rgba(26, 115, 232, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 32px rgba(26, 115, 232, 0.55);
}

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

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  #main-nav ul {
    gap: 2px;
  }

  #main-nav a {
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  #site-search input {
    width: 120px;
  }

  #site-search input:focus {
    width: 150px;
  }

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

  #solutions > h3 ~ h4,
  #solutions > h3 ~ p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 64px;
  }

  #menu-toggle {
    display: flex;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-header);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
    overflow-y: auto;
    z-index: 998;
  }

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

  #main-nav ul {
    flex-direction: column;
    gap: 4px;
    width: 100%;
  }

  #main-nav a {
    display: block;
    padding: 14px 20px;
    font-size: 1rem;
    border-radius: var(--radius-md);
    text-align: left;
  }

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

  #site-search {
    display: none;
  }

  #hero {
    padding: 48px 24px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  #about,
  #products,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal {
    padding: 28px 20px;
  }

  section > h2 {
    font-size: 1.3rem;
  }

  section > h3 {
    font-size: 1.08rem;
  }

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

@media (max-width: 480px) {
  main {
    padding: calc(var(--header-height) + 16px) 12px 40px;
  }

  .header-inner {
    padding: 0 12px;
    gap: 8px;
  }

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

  .brand-logo svg {
    width: 32px;
    height: 32px;
  }

  #hero {
    padding: 36px 18px;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: 1.4rem;
  }

  .hero-lead {
    font-size: 0.9rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 13px 24px;
    font-size: 0.95rem;
  }

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

  .stat {
    padding: 14px 8px;
  }

  .stat .num {
    font-size: 1.25rem;
  }

  .stat .label {
    font-size: 0.75rem;
  }

  #about,
  #products,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal {
    padding: 22px 16px;
    border-radius: var(--radius-md);
  }

  section > h2 {
    font-size: 1.15rem;
    padding-bottom: 12px;
  }

  section > h2::after {
    width: 40px;
    height: 3px;
  }

  section > h3 {
    font-size: 1rem;
    padding-left: 10px;
    border-left-width: 3px;
  }

  section > p {
    font-size: 0.9rem;
  }

  #articles article {
    padding: 18px 16px;
  }

  #articles article h3 {
    font-size: 1rem;
  }

  #faq summary {
    padding: 14px 16px;
    font-size: 0.9rem;
  }

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.88rem;
  }

  #sitemap ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #sitemap a {
    padding: 10px 12px;
    font-size: 0.82rem;
  }

  #links a {
    padding: 8px 16px;
    font-size: 0.82rem;
  }

  #back-to-top {
    bottom: 18px;
    right: 18px;
    width: 42px;
    height: 42px;
    font-size: 1.1rem;
  }

  blockquote {
    padding: 18px 18px 18px 44px;
  }

  blockquote::before {
    left: 12px;
    font-size: 2.4rem;
  }

  .footer-inner p {
    font-size: 0.78rem;
  }
}

/* ========== ACCESSIBILITY ========== */
@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;
  }
}

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

/* ========== PRINT ========== */
@media print {
  #site-header,
  #back-to-top,
  #theme-toggle,
  #menu-toggle,
  .hero-actions,
  #site-search {
    display: none !important;
  }

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

  main {
    padding-top: 0;
  }

  section {
    break-inside: avoid;
  }
}