:root {
  --color-primary: #5b3df5;
  --color-primary-dark: #4529d9;
  --color-primary-light: #8b74ff;
  --color-secondary: #ff6b9d;
  --color-accent: #00d4ff;
  --color-bg: #f6f7fb;
  --color-bg-elevated: #ffffff;
  --color-bg-soft: #eef0f8;
  --color-text: #1a1d2e;
  --color-text-secondary: #5a5f7a;
  --color-text-muted: #8b90a8;
  --color-border: rgba(91, 61, 245, 0.12);
  --color-border-strong: rgba(91, 61, 245, 0.25);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-shadow: 0 8px 32px rgba(91, 61, 245, 0.1);
  --gradient-hero: linear-gradient(135deg, #5b3df5 0%, #8b5cf6 35%, #c084fc 65%, #ff6b9d 100%);
  --gradient-btn: linear-gradient(135deg, #5b3df5, #8b5cf6);
  --gradient-btn-hover: linear-gradient(135deg, #4529d9, #7c3aed);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
  --shadow-sm: 0 2px 8px rgba(26, 29, 46, 0.06);
  --shadow-md: 0 6px 24px rgba(26, 29, 46, 0.08);
  --shadow-lg: 0 16px 48px rgba(91, 61, 245, 0.15);
  --shadow-glow: 0 0 24px rgba(91, 61, 245, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --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(0.16, 1, 0.3, 1);
  --header-height: 72px;
  --max-width: 1200px;
}

[data-theme="dark"] {
  --color-bg: #0e1018;
  --color-bg-elevated: #181b28;
  --color-bg-soft: #1f2334;
  --color-text: #e8eaf2;
  --color-text-secondary: #a0a5c0;
  --color-text-muted: #6b7090;
  --color-border: rgba(139, 116, 255, 0.15);
  --color-border-strong: rgba(139, 116, 255, 0.3);
  --glass-bg: rgba(24, 27, 40, 0.72);
  --glass-border: rgba(139, 116, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --gradient-hero: linear-gradient(135deg, #2a1a6e 0%, #4c1d95 35%, #6d28d9 65%, #9d174d 100%);
  --gradient-btn: linear-gradient(135deg, #7c5cff, #a78bfa);
  --gradient-btn-hover: linear-gradient(135deg, #6d4aff, #9575ff);
  --gradient-card: linear-gradient(145deg, rgba(30, 34, 52, 0.9), rgba(24, 27, 40, 0.6));
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(124, 92, 255, 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(91, 61, 245, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 10%, rgba(255, 107, 157, 0.06), transparent);
  pointer-events: none;
}

[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(124, 92, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 10%, rgba(255, 107, 157, 0.08), transparent);
}

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

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

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

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

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

ul, ol {
  list-style: none;
}

.visually-hidden {
  position: absolute;
  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(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand svg {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(91, 61, 245, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 6px 20px rgba(91, 61, 245, 0.45);
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

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

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.main-nav ul::-webkit-scrollbar {
  display: none;
}

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

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.main-nav a:hover {
  color: var(--color-primary);
  background: rgba(91, 61, 245, 0.06);
}

.main-nav a:hover::after {
  width: 40%;
}

.site-search {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(91, 61, 245, 0.12);
}

.site-search input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--color-text);
  width: 180px;
  transition: width var(--transition-base);
}

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

.site-search input:focus {
  width: 220px;
}

.site-search button {
  border: none;
  background: var(--gradient-btn);
  color: #fff;
  padding: 8px 18px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.site-search button:hover {
  opacity: 0.9;
}

.site-search button:active {
  transform: scale(0.96);
}

#theme-toggle {
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: var(--color-bg-soft);
  color: var(--color-text-secondary);
  padding: 8px 16px;
  font-size: 0.8rem;
  font-family: inherit;
  font-weight: 500;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

#theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(91, 61, 245, 0.08);
  transform: translateY(-1px);
}

#theme-toggle:active {
  transform: translateY(0) scale(0.97);
}

/* ===== MAIN LAYOUT ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

section {
  margin-top: 64px;
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

section:nth-child(1) { animation-delay: 0.05s; }
section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.15s; }
section:nth-child(4) { animation-delay: 0.2s; }
section:nth-child(5) { animation-delay: 0.25s; }
section:nth-child(6) { animation-delay: 0.3s; }
section:nth-child(7) { animation-delay: 0.35s; }
section:nth-child(8) { animation-delay: 0.4s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(91, 61, 245, 0.3); }
  50% { box-shadow: 0 0 0 12px rgba(91, 61, 245, 0); }
}

h1, h2, h3 {
  color: var(--color-text);
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.6rem;
  font-weight: 800;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 1.1em;
  background: var(--gradient-btn);
  border-radius: var(--radius-full);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--color-text);
}

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

strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ===== HERO ===== */
#hero {
  position: relative;
  margin-top: 32px;
  padding: 64px 40px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: gradientShift 12s ease infinite;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.25), transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.2), transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
  pointer-events: none;
}

#hero h1 {
  color: #fff;
  font-size: 2.8rem;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
  animation: fadeInUp 0.8s 0.1s both;
}

.hero-sub {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 12px;
  animation: fadeInUp 0.8s 0.2s both;
}

.hero-lead {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s 0.3s both;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
  animation: fadeInUp 0.8s 0.4s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.6) 50%, transparent 70%);
  background-size: 200% 100%;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  color: var(--color-primary-dark);
}

.btn-primary:hover::after {
  opacity: 1;
  animation: shimmer 1s ease;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.28);
  border-color: #fff;
  transform: translateY(-3px);
  color: #fff;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  animation: fadeInUp 0.8s 0.5s both;
}

.hero-stats li {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: center;
  transition: transform var(--transition-base), background var(--transition-base);
}

.hero-stats li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.2);
}

.hero-stats strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.hero-stats span {
  display: block;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 4px;
}

/* ===== BREADCRUMB ===== */
#breadcrumb {
  margin-top: 24px;
  padding: 12px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

#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(--color-text-muted);
}

#breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--color-text-muted);
  opacity: 0.5;
}

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

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

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

/* ===== CONTENT SECTIONS ===== */
#ova-intro,
#about,
#products,
#solutions,
#cases,
#news,
#articles,
#howto,
#faq,
#contact,
#sitemap,
#links,
#legal,
#eeat {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--glass-shadow);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

#ova-intro:hover,
#about:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#howto:hover,
#faq:hover,
#contact:hover,
#sitemap:hover,
#links:hover,
#legal:hover,
#eeat:hover {
  box-shadow: var(--shadow-lg);
}

/* ===== PRODUCTS ===== */
#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

#products ul li {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#products ul li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--gradient-btn);
  opacity: 0;
  transition: opacity var(--transition-base);
}

#products ul li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

#products ul li:hover::before {
  opacity: 1;
}

/* ===== SOLUTIONS ===== */
#solutions ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

#solutions ul li {
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-base);
}

#solutions ul li:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-strong);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

/* ===== CASES ===== */
#cases blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 56px;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 18px;
  top: 8px;
  font-size: 3rem;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.25;
  font-family: Georgia, serif;
}

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

#cases blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}

/* ===== NEWS ===== */
#news article {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding-left var(--transition-base);
}

#news article:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

#news article:hover {
  padding-left: 12px;
}

#news h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

#news h3 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

#news h3 a:hover {
  color: var(--color-primary);
}

#news time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  padding: 2px 10px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-full);
}

/* ===== ARTICLES ===== */
#articles > p {
  margin-bottom: 20px;
}

#articles article {
  padding: 22px 24px;
  margin-bottom: 14px;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#articles article::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, rgba(91, 61, 245, 0.08), transparent 70%);
  border-radius: 0 0 0 80px;
  transition: transform var(--transition-base);
}

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

#articles article:hover::after {
  transform: scale(1.5);
}

#articles h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
}

#articles h3 a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

#articles time {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

#articles > article > a:last-child {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

#articles > article > a:last-child::after {
  content: "\2192";
  transition: transform var(--transition-fast);
}

#articles > article > a:last-child:hover {
  gap: 8px;
}

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

/* ===== HOWTO ===== */
#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 16px 18px 16px 60px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(91, 61, 245, 0.3);
  transition: transform var(--transition-base);
}

#howto ol li:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-strong);
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.12);
}

#howto ul {
  display: grid;
  gap: 8px;
  margin: 12px 0;
}

#howto ul li {
  position: relative;
  padding-left: 24px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

#howto ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background: var(--gradient-btn);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(91, 61, 245, 0.4);
}

/* ===== FAQ ===== */
#faq details {
  margin-bottom: 10px;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

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

#faq details:hover {
  border-color: var(--color-border-strong);
}

#faq summary {
  padding: 16px 48px 16px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--color-primary);
  transition: transform var(--transition-base), color var(--transition-fast);
  line-height: 1;
}

#faq details[open] summary::after {
  content: "\2212";
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--color-primary);
  background: rgba(91, 61, 245, 0.04);
}

#faq details p {
  padding: 0 20px 18px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  animation: fadeIn 0.4s ease;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
  margin: 0 20px 0;
  padding-left: 0;
  padding-right: 0;
}

/* ===== CONTACT ===== */
#contact address {
  font-style: normal;
  display: grid;
  gap: 10px;
  margin: 16px 0 24px;
}

#contact address p {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: baseline;
  padding: 10px 16px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
  margin: 0;
}

#contact address p:hover {
  background: var(--color-bg-elevated);
  transform: translateX(4px);
}

#contact address a {
  font-weight: 600;
}

/* ===== SITEMAP & LINKS ===== */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 10px 16px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

#sitemap ul li a::before,
#links ul li a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--gradient-btn);
  transform: scaleY(0);
  transition: transform var(--transition-base);
  transform-origin: bottom;
}

#sitemap ul li a:hover,
#links ul li a:hover {
  background: var(--color-bg-elevated);
  color: var(--color-primary);
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#sitemap ul li a:hover::before,
#links ul li a:hover::before {
  transform: scaleY(1);
}

/* ===== LEGAL ===== */
#legal h3 {
  margin-top: 20px;
}

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

/* ===== EEAT ===== */
#eeat p {
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
}

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

#eeat strong {
  color: var(--color-primary);
}

/* ===== FOOTER ===== */
#site-footer {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  margin-top: 64px;
  padding: 48px 24px 32px;
  position: relative;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-hero);
  background-size: 200% 100%;
  animation: gradientShift 8s ease infinite;
}

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

.footer-inner p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.footer-inner nav {
  margin-top: 20px;
}

.footer-inner nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
}

.footer-inner nav a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  position: relative;
  transition: color var(--transition-fast);
}

.footer-inner nav a::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--gradient-btn);
  transition: width var(--transition-base);
}

.footer-inner nav a:hover {
  color: var(--color-primary);
}

.footer-inner nav a:hover::after {
  width: 100%;
}

/* ===== BACK TO TOP ===== */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: all var(--transition-base);
  line-height: 1.1;
  text-align: center;
  padding: 0;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 20px 48px rgba(91, 61, 245, 0.45), var(--shadow-glow);
}

#back-to-top:active {
  transform: translateY(-2px) scale(1.02);
}

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

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-soft);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--color-primary-dark), var(--color-primary));
}

::selection {
  background: rgba(91, 61, 245, 0.25);
  color: var(--color-text);
}

/* ===== FOCUS ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 20px;
    gap: 12px;
  }

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

  .main-nav ul {
    justify-content: flex-start;
    padding-bottom: 4px;
  }

  .site-search {
    margin-left: auto;
  }

  .site-search input {
    width: 140px;
  }

  .site-search input:focus {
    width: 170px;
  }

  h1 {
    font-size: 2.2rem;
  }

  #hero {
    padding: 48px 28px;
  }

  #hero h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  main {
    padding: 0 16px 60px;
  }

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

  .brand-name {
    display: none;
  }

  .site-search input {
    width: 110px;
    padding: 7px 12px;
  }

  .site-search input:focus {
    width: 140px;
  }

  .site-search button {
    padding: 7px 12px;
    font-size: 0.78rem;
  }

  #theme-toggle {
    padding: 7px 12px;
    font-size: 0.75rem;
  }

  #hero {
    margin-top: 20px;
    padding: 36px 22px;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: 1.75rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-lead {
    font-size: 0.88rem;
  }

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

  .hero-stats strong {
    font-size: 1.35rem;
  }

  .hero-stats span {
    font-size: 0.72rem;
  }

  h2 {
    font-size: 1.35rem;
    padding-left: 14px;
  }

  h3 {
    font-size: 1.05rem;
  }

  section {
    margin-top: 40px;
  }

  #ova-intro,
  #about,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links,
  #legal,
  #eeat {
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

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

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

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

  #cases blockquote {
    padding: 16px 16px 16px 44px;
  }

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

  #howto ol li {
    padding: 14px 14px 14px 52px;
  }

  #howto ol li::before {
    left: 12px;
    width: 26px;
    height: 26px;
    font-size: 0.75rem;
  }

  .btn-primary,
  .btn-secondary {
    padding: 11px 24px;
    font-size: 0.88rem;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
    font-size: 0.62rem;
  }

  #site-footer {
    padding: 32px 16px 24px;
  }
}

@media (max-width: 480px) {
  #hero h1 {
    font-size: 1.5rem;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

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

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

  .main-nav a {
    padding: 6px 10px;
    font-size: 0.82rem;
  }
}

/* ===== 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;
  }

  section {
    opacity: 1;
    transform: none;
  }
}

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

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

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

  #hero {
    background: #f0f0f0;
    color: #000;
  }

  #hero h1,
  .hero-sub,
  .hero-lead,
  .hero-stats strong,
  .hero-stats span {
    color: #000;
  }
}