/* ===================================================================
   Cotocus.cn - Premium Global Technology Company Website
   Custom Styles
   =================================================================== */

/* --- CSS Variables --- */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #06b6d4;
  --color-accent: #8b5cf6;
  --color-dark: #0a0e1a;
  --color-dark-2: #111827;
  --color-dark-3: #1f2937;
  --color-light: #f8fafc;
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --gradient-primary: linear-gradient(135deg, #2563eb, #7c3aed);
  --gradient-dark: linear-gradient(135deg, #0a0e1a, #1e1b4b);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
  --gradient-cta: linear-gradient(135deg, #2563eb, #8b5cf6);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 40px rgba(37,99,235,0.15);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
}

/* --- Smooth Scrolling --- */
html {
  scroll-behavior: smooth;
}

/* --- Base Styles --- */
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-white);
  color: var(--color-gray-900);
  line-height: 1.6;
}

/* --- Selection --- */
::selection {
  background-color: rgba(37, 99, 235, 0.2);
  color: var(--color-primary);
}

/* --- Focus Styles --- */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --- Glass Effect --- */
.glass {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-dark {
  background: rgba(10, 14, 26, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.glass-card {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.3s ease;
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* --- Gradient Text --- */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-cyan {
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Animated Gradient Background --- */
.animated-gradient {
  background: linear-gradient(-45deg, #0f172a, #1e1b4b, #0f172a, #1e1b4b);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

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

/* --- Subtle Grid Background --- */
.bg-grid {
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* --- Glow Effects --- */
.glow-blue {
  box-shadow: 0 0 60px rgba(37, 99, 235, 0.15);
}

.glow-purple {
  box-shadow: 0 0 60px rgba(139, 92, 246, 0.15);
}

/* --- Floating Animation --- */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* --- Pulse Glow --- */
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(37, 99, 235, 0.2); }
  50% { box-shadow: 0 0 40px rgba(37, 99, 235, 0.4); }
}

.animate-pulse-glow {
  animation: pulseGlow 3s ease-in-out infinite;
}

/* --- Fade In Up --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* --- Stagger animations for children --- */
.stagger > * {
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.1s; }
.stagger > *:nth-child(2) { animation-delay: 0.2s; }
.stagger > *:nth-child(3) { animation-delay: 0.3s; }
.stagger > *:nth-child(4) { animation-delay: 0.4s; }
.stagger > *:nth-child(5) { animation-delay: 0.5s; }
.stagger > *:nth-child(6) { animation-delay: 0.6s; }

/* --- Line Clamp --- */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Section Dividers --- */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.2), transparent);
}

/* --- Custom Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-gray-700);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* --- Navbar Styles --- */
.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: var(--gradient-primary);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* --- Mobile Menu --- */
.mobile-menu {
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-menu.open {
  transform: translateX(0);
  opacity: 1;
}

/* --- Hero Badge --- */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  font-size: 0.875rem;
  font-weight: 500;
  color: #93c5fd;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3b82f6;
  animation: pulseGlow 2s ease-in-out infinite;
}

/* --- Service Card --- */
.service-card {
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

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

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* --- Product Card --- */
.product-card {
  transition: all 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.product-card .product-icon {
  transition: transform 0.3s ease;
}

.product-card:hover .product-icon {
  transform: scale(1.1);
}

/* --- Industry Tag --- */
.industry-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.industry-tag:hover {
  transform: translateY(-1px);
}

/* --- Stat Counter --- */
.stat-number {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* --- CTA Button --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--gradient-cta);
  color: white;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: white;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 1.5px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.btn-white {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: white;
  color: var(--color-primary);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* --- Section Heading --- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-label-primary {
  background: rgba(37, 99, 235, 0.1);
  color: #60a5fa;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.section-label-cyan {
  background: rgba(6, 182, 212, 0.1);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.2);
}

/* --- Accordion --- */
.accordion-btn {
  transition: all 0.3s ease;
}

.accordion-btn[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-icon {
  transition: transform 0.3s ease;
}

/* --- Tab --- */
.tab-btn {
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  border-bottom-color: var(--color-primary);
  color: var(--color-primary);
}

/* --- Client Logo --- */
.client-logo {
  filter: grayscale(100%);
  opacity: 0.6;
  transition: all 0.3s ease;
}

.client-logo:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* --- Footer Styles --- */
.footer-link {
  transition: all 0.3s ease;
  color: var(--color-gray-400);
}

.footer-link:hover {
  color: white;
  padding-left: 4px;
}

/* --- Form Styles --- */
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  color: white;
  transition: all 0.3s ease;
  font-size: 0.9375rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-input::placeholder {
  color: rgba(255, 255, 255, 0.3);
}

.form-input-light {
  width: 100%;
  padding: 0.75rem 1rem;
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  color: var(--color-gray-900);
  transition: all 0.3s ease;
  font-size: 0.9375rem;
}

.form-input-light:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input-light::placeholder {
  color: var(--color-gray-400);
}

/* --- Loading Skeleton --- */
.skeleton {
  background: linear-gradient(90deg, #1f2937 25%, #374151 50%, #1f2937 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

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

/* --- Timeline --- */
.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  transform: translateX(-50%);
}

.timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid white;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
}

/* --- Responsive Tweaks --- */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
    line-height: 1.2;
  }

  .section-title {
    font-size: 1.75rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .hero-title {
    font-size: 3rem;
  }
}

@media (min-width: 1025px) {
  .hero-title {
    font-size: 3.75rem;
  }
}

/* --- Print Styles --- */
@media print {
  .no-print {
    display: none !important;
  }
}

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