/* ========================================
   河南婷好网络科技有限公司 — 官网样式
   Premium Dark Theme
   ======================================== */

:root {
  --bg-primary: #060b18;
  --bg-secondary: #0c1225;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-gold: #c9a962;
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
  --gradient-text: linear-gradient(135deg, #60a5fa 0%, #818cf8 50%, #a78bfa 100%);
  --shadow-glow: 0 0 60px rgba(59, 130, 246, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Loader ========== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-inner {
  text-align: center;
}

.loader-logo {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
  letter-spacing: 0.2em;
}

.loader-bar {
  width: 120px;
  height: 2px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
  margin: 0 auto;
}

.loader-progress {
  width: 0;
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  animation: loadProgress 1.2s ease forwards;
}

@keyframes loadProgress {
  to { width: 100%; }
}

/* ========== Header ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(6, 11, 24, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.125rem;
}

.logo-icon svg {
  width: 36px;
  height: 36px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-cta {
  padding: 10px 24px;
  background: var(--gradient-primary);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  z-index: 1;
  pointer-events: none;
}

.hero-glow-1 {
  width: 600px;
  height: 600px;
  background: rgba(59, 130, 246, 0.3);
  top: -200px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}

.hero-glow-2 {
  width: 500px;
  height: 500px;
  background: rgba(99, 102, 241, 0.25);
  bottom: -150px;
  left: -100px;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 24px 120px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  letter-spacing: 0.05em;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.title-line {
  display: block;
}

.title-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  padding: 32px 48px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-unit {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-blue), transparent);
  animation: scrollLine 2s ease infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  50.1% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ========== Sections Common ========== */
.section {
  padding: 120px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
}

/* ========== Services ========== */
.services {
  background: var(--bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  position: relative;
  padding: 36px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.service-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-md);
  color: var(--accent-blue);
  margin-bottom: 24px;
}

.service-icon svg {
  width: 32px;
  height: 32px;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.service-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ========== Advantages ========== */
.advantages-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.advantages-content .section-header {
  text-align: left;
  margin-bottom: 48px;
}

.advantage-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.advantage-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.advantage-num {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.5;
  line-height: 1;
  flex-shrink: 0;
}

.advantage-info h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.advantage-info p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.advantages-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.visual-card {
  position: relative;
  width: 360px;
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.visual-ring-1 {
  width: 100%;
  height: 100%;
  animation: rotate 20s linear infinite;
  border-color: rgba(59, 130, 246, 0.2);
}

.visual-ring-2 {
  width: 75%;
  height: 75%;
  animation: rotate 15s linear infinite reverse;
  border-color: rgba(99, 102, 241, 0.25);
}

.visual-ring-3 {
  width: 50%;
  height: 50%;
  animation: rotate 10s linear infinite;
  border-color: rgba(139, 92, 246, 0.3);
}

@keyframes rotate {
  to { transform: rotate(360deg); }
}

.visual-center {
  text-align: center;
  z-index: 1;
}

.visual-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.visual-value {
  display: block;
  font-size: 3.5rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.visual-sub {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ========== About ========== */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.info-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.info-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.info-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

.info-card p:last-child {
  margin-bottom: 0;
}

.info-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.detail-item {
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.detail-full {
  grid-column: 1 / -1;
}

.detail-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.detail-value {
  font-size: 0.875rem;
  font-weight: 500;
  word-break: break-all;
}

.license-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-glow);
}

.license-frame img {
  width: 100%;
  height: auto;
}

.license-badge {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: rgba(6, 11, 24, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--accent-gold);
  white-space: nowrap;
}

/* ========== Contact ========== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info .section-header {
  text-align: left;
  margin-bottom: 40px;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.contact-card:hover {
  border-color: var(--border-hover);
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-sm);
  color: var(--accent-blue);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
}

.contact-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
}

.contact-form {
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contact-form h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9375rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent-blue);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-note {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* ========== Site Link ========== */
.site-link {
  color: var(--accent-blue);
  transition: color var(--transition);
  word-break: break-all;
}

.site-link:hover {
  color: #60a5fa;
}

/* ========== Insights ========== */
.insights {
  background: var(--bg-primary);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.insight-card {
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.insight-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.insight-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.insight-tag {
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.12);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--accent-blue);
}

.insight-meta time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.insight-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
}

.insight-card h3 a {
  transition: color var(--transition);
}

.insight-card h3 a:hover {
  color: var(--accent-blue);
}

.insight-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.75;
  flex: 1;
  margin-bottom: 20px;
}

.insight-read {
  font-size: 0.875rem;
  color: var(--accent-blue);
  font-weight: 500;
  transition: gap var(--transition);
}

.insight-read:hover {
  color: #60a5fa;
}

/* ========== Article Page ========== */
.article-page {
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 80px;
  min-height: 70vh;
}

.article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  transition: color var(--transition);
}

.article-back:hover {
  color: var(--accent-blue);
}

.article-header {
  margin-bottom: 40px;
}

.article-header .insight-meta {
  justify-content: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.article-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-summary {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.8;
  padding-left: 16px;
  border-left: 3px solid var(--accent-blue);
}

.article-body {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.9;
}

.article-body h2 {
  color: var(--text-primary);
  font-size: 1.375rem;
  font-weight: 600;
  margin: 40px 0 16px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul {
  margin: 0 0 20px 1.5em;
}

.article-body li {
  margin-bottom: 8px;
}

.article-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.article-author {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-nav {
  display: flex;
  gap: 16px;
}

.article-nav a {
  font-size: 0.875rem;
  color: var(--accent-blue);
}

.article-nav a:hover {
  color: #60a5fa;
}

.header-article .nav-link.active {
  background: none;
}

/* ========== Footer ========== */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 64px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 16px;
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-col a,
.footer-col span {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========== Back to Top ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 999;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  background: rgba(6, 11, 24, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 100px;
  color: #22c55e;
  font-size: 0.875rem;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ========== Reveal Animation ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantages-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background: rgba(6, 11, 24, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-link {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-stats {
    flex-direction: column;
    gap: 24px;
    padding: 24px 32px;
  }

  .stat-divider {
    width: 40px;
    height: 1px;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .insights-grid {
    grid-template-columns: 1fr;
  }

  .info-details {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .visual-card {
    width: 280px;
    height: 280px;
  }

  .section {
    padding: 80px 0;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .contact-form {
    padding: 28px 20px;
  }
}