/* ============================================================
   DoradoAR — 互联网定制专家
   主样式表 | Main Stylesheet
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #7c3aed;
  --color-accent: #06b6d4;
  --color-dark: #0f172a;
  --color-dark-2: #1e293b;
  --color-dark-3: #334155;
  --color-gray: #64748b;
  --color-gray-light: #94a3b8;
  --color-gray-lighter: #cbd5e1;
  --color-gray-bg: #f1f5f9;
  --color-gray-card: #f8fafc;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.04);

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --header-height: 72px;
  --max-width: 1280px;
  --content-padding: var(--space-6);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-dark);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

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

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

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-dark);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

.section-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray);
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.text-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: 1.5;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
  -webkit-tap-highlight-color: transparent;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

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

.btn-white:hover {
  background: var(--color-gray-bg);
  color: var(--color-primary-dark);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: all var(--transition-base);
  height: var(--header-height);
}

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

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-dark);
  text-decoration: none;
  min-height: 44px;
  min-width: 44px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 800;
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text .brand {
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-dark);
}

.logo-text .tagline {
  font-size: var(--text-xs);
  color: var(--color-gray);
  font-weight: 400;
  line-height: 1;
}

/* Desktop Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-dark-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.06);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-left: var(--space-1);
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23334155'%3E%3Cpath fill-rule='evenodd' d='M5.23 7.21a.75.75 0 011.06.02L10 11.168l3.71-3.938a.75.75 0 111.08 1.04l-4.25 4.5a.75.75 0 01-1.08 0l-4.25-4.5a.75.75 0 01.02-1.06z' clip-rule='evenodd'/%3E%3C/svg%3E") center/contain no-repeat;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover > a::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(0,0,0,0.06);
  padding: var(--space-3);
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-dark-3);
  border-radius: var(--radius-md);
  white-space: nowrap;
}

.dropdown-menu a:hover {
  background: var(--color-gray-bg);
  color: var(--color-primary);
}

.dropdown-menu a .dropdown-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-base);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  gap: 5px;
  z-index: 1001;
  -webkit-tap-highlight-color: transparent;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--color-white);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: calc(var(--header-height) + var(--space-6)) var(--space-6) var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
}

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

.mobile-nav a {
  display: flex;
  align-items: center;
  padding: var(--space-4);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-dark);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  min-height: 48px;
}

.mobile-nav a:hover,
.mobile-nav a.active {
  background: var(--color-gray-bg);
  color: var(--color-primary);
}

.mobile-nav .mobile-dropdown {
  border-bottom: 1px solid var(--color-gray-bg);
}

.mobile-nav .mobile-dropdown-children {
  padding-left: var(--space-6);
  display: none;
}

.mobile-nav .mobile-dropdown.open .mobile-dropdown-children {
  display: block;
}

.mobile-nav .mobile-dropdown-toggle::after {
  content: '+';
  margin-left: auto;
  font-size: var(--text-xl);
  font-weight: 300;
  transition: transform var(--transition-fast);
}

.mobile-nav .mobile-dropdown.open .mobile-dropdown-toggle::after {
  content: '−';
}

.mobile-nav .mobile-dropdown-children a {
  font-size: var(--text-base);
  font-weight: 500;
  padding: var(--space-3) var(--space-4);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
  background: linear-gradient(135deg, #eff6ff 0%, #faf5ff 50%, #ecfeff 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

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

.hero h1 {
  font-size: var(--text-6xl);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: var(--text-xl);
  color: var(--color-gray);
  margin-bottom: var(--space-8);
  max-width: 580px;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-visual {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 0;
  opacity: 0.6;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-16);
}

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

.hero-stat .number {
  font-size: var(--text-4xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .label {
  font-size: var(--text-sm);
  color: var(--color-gray);
  margin-top: var(--space-1);
}

/* ============================================================
   SECTIONS COMMON
   ============================================================ */
.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}

.section-dark .section-title {
  background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-dark .section-subtitle {
  color: var(--color-gray-light);
}

.section-gray {
  background: var(--color-gray-bg);
}

.section-cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
}

/* ============================================================
   SERVICE CARDS
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.04);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

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

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

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}

.service-icon.ai { background: linear-gradient(135deg, #dbeafe, #ede9fe); }
.service-icon.hardware { background: linear-gradient(135deg, #dcfce7, #d1fae5); }
.service-icon.edu { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.service-icon.dev { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.service-icon.payment { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); }
.service-icon.web { background: linear-gradient(135deg, #ccfbf1, #99f6e4); }

.service-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.service-card p {
  color: var(--color-gray);
  font-size: var(--text-sm);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

.service-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.service-card .card-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.service-card:hover .card-link::after {
  transform: translateX(4px);
}

/* ============================================================
   FEATURES / WHY US
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.feature-item {
  text-align: center;
  padding: var(--space-6);
}

.feature-item .feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  background: var(--color-gray-bg);
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.feature-item h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.feature-item p {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

/* ============================================================
   PROCESS / WORKFLOW
   ============================================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: var(--color-gray-lighter);
  z-index: 0;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.process-step .step-number {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-size: var(--text-xl);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  transition: all var(--transition-base);
}

.process-step:hover .step-number {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.1);
}

.process-step h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.process-step p {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

/* ============================================================
   TESTIMONIALS / CLIENTS
   ============================================================ */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.client-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.04);
}

.client-card .quote {
  font-size: var(--text-base);
  color: var(--color-dark-3);
  font-style: italic;
  margin-bottom: var(--space-6);
  line-height: 1.7;
  position: relative;
  padding-left: var(--space-6);
}

.client-card .quote::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -8px;
  font-size: var(--text-4xl);
  color: var(--color-primary);
  font-style: normal;
  font-weight: 800;
  line-height: 1;
}

.client-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.client-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.client-info strong {
  font-size: var(--text-sm);
  display: block;
}

.client-info span {
  font-size: var(--text-xs);
  color: var(--color-gray);
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-content {
  text-align: center;
}

.cta-content h2 {
  color: var(--color-white);
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.cta-content p {
  color: rgba(255,255,255,0.8);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-dark);
  color: var(--color-gray-light);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer-brand p {
  font-size: var(--text-sm);
  margin-top: var(--space-4);
  line-height: 1.7;
}

.footer-heading {
  color: var(--color-white);
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-gray-light);
  padding: var(--space-1) 0;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid var(--color-dark-2);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-dark-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-light);
  transition: all var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
}

.footer-social a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ============================================================
   PAGE HERO (Inner Pages)
   ============================================================ */
.page-hero {
  padding: calc(var(--header-height) + var(--space-16)) 0 var(--space-12);
  background: linear-gradient(135deg, #eff6ff 0%, #faf5ff 50%, #ecfeff 100%);
  text-align: center;
}

.page-hero h1 {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-4);
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--color-gray);
  max-width: 640px;
  margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-gray);
  margin-bottom: var(--space-4);
}

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

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

.breadcrumb .separator {
  color: var(--color-gray-lighter);
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about-image {
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, #dbeafe, #ede9fe);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
}

.about-text h2 {
  margin-bottom: var(--space-4);
}

.about-text p {
  color: var(--color-gray);
  margin-bottom: var(--space-4);
  line-height: 1.8;
}

.values-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.value-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.value-item .value-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-base);
}

.value-item strong {
  display: block;
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.value-item span {
  font-size: var(--text-xs);
  color: var(--color-gray);
  display: block;
}

/* Team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.team-card {
  text-align: center;
}

.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto var(--space-4);
  background: linear-gradient(135deg, #dbeafe, #ede9fe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  border: 4px solid var(--color-white);
  box-shadow: var(--shadow-md);
}

.team-card h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.team-card .role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
}

/* ============================================================
   PRODUCTS PAGE
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.product-detail-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.04);
  transition: all var(--transition-base);
}

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

.product-detail-card .product-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.product-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.product-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-gray-bg);
  color: var(--color-gray);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
}

/* Product detail page */
.product-hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
  margin-top: var(--space-8);
}

.product-visual {
  aspect-ratio: 1;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: linear-gradient(135deg, #eff6ff, #faf5ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  box-shadow: var(--shadow-xl);
}

.product-info h2 {
  margin-bottom: var(--space-4);
}

.product-info p {
  color: var(--color-gray);
  margin-bottom: var(--space-6);
  line-height: 1.8;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.feature-list li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Tech spec table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-8);
}

.specs-table th,
.specs-table td {
  padding: var(--space-4) var(--space-6);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-bg);
  font-size: var(--text-sm);
}

.specs-table th {
  background: var(--color-gray-bg);
  font-weight: 600;
  width: 180px;
  color: var(--color-dark-3);
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
}

.contact-info-side h2 {
  margin-bottom: var(--space-4);
}

.contact-info-side > p {
  color: var(--color-gray);
  margin-bottom: var(--space-8);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-method {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.contact-method-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xl);
  background: rgba(37, 99, 235, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.contact-method h4 {
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.contact-method p {
  font-size: var(--text-sm);
  color: var(--color-gray);
}

/* Contact Form */
.contact-form {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(0,0,0,0.04);
}

.contact-form h3 {
  margin-bottom: var(--space-6);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-gray-lighter);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-dark);
  background: var(--color-white);
  transition: all var(--transition-fast);
  min-height: 44px;
}

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

.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-danger);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

/* ============================================================
   SEARCH
   ============================================================ */
.search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-dark-3);
  font-size: var(--text-lg);
  -webkit-tap-highlight-color: transparent;
}

.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

.search-modal {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  width: 90%;
  max-width: 640px;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-gray-bg);
}

.search-input-wrap input {
  flex: 1;
  border: none;
  outline: none;
  font-size: var(--text-lg);
  color: var(--color-dark);
  padding: var(--space-2) 0;
  min-height: 44px;
}

.search-input-wrap input::placeholder {
  color: var(--color-gray-lighter);
}

.search-close {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--color-gray-bg);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  color: var(--color-gray);
  min-width: 44px;
  min-height: 44px;
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: var(--space-3);
}

.search-result-item {
  display: block;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
}

.search-result-item:hover {
  background: var(--color-gray-bg);
}

.search-result-item h3 {
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
}

.search-result-item p {
  font-size: var(--text-xs);
  color: var(--color-gray);
}

.search-no-result {
  padding: var(--space-8);
  text-align: center;
  color: var(--color-gray);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease both;
}

.fade-in {
  animation: fadeIn 0.6s ease both;
}

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

/* ============================================================
   SCROLL TO TOP
   ============================================================ */
.scroll-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 900;
}

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

.scroll-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ============================================================
   LAZY LOADING
   ============================================================ */
.lazy-img {
  opacity: 0;
  transition: opacity var(--transition-base);
}

.lazy-img.loaded {
  opacity: 1;
}

/* ============================================================
   SKIP LINK (Accessibility)
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  z-index: 10001;
  font-weight: 600;
  font-size: var(--text-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ============================================================
   RESPONSIVE — Tablet (768px - 1023px)
   ============================================================ */
@media (max-width: 1023px) {
  :root {
    --text-6xl: 3rem;
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
    --content-padding: var(--space-4);
  }

  .section {
    padding: var(--space-16) 0;
  }

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

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

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

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

  .process-steps::before {
    display: none;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .products-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .product-hero-layout {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

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

  .hero h1 {
    font-size: var(--text-5xl);
  }

  .hero-visual {
    display: none;
  }

  .hero-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .values-list {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   RESPONSIVE — Mobile (< 768px)
   ============================================================ */
@media (max-width: 767px) {
  :root {
    --text-6xl: 2.25rem;
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
    --header-height: 64px;
    --content-padding: var(--space-4);
  }

  .section {
    padding: var(--space-12) 0;
  }

  /* Hide desktop nav, show hamburger */
  .main-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Hero */
  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + var(--space-8));
    padding-bottom: var(--space-12);
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero h1 {
    font-size: var(--text-6xl);
  }

  .hero p {
    font-size: var(--text-base);
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
  }

  .hero-stat .number {
    font-size: var(--text-2xl);
  }

  /* Grids → 1 column */
  .services-grid,
  .features-grid,
  .clients-grid,
  .process-steps,
  .products-grid {
    grid-template-columns: 1fr;
  }

  .service-card,
  .product-detail-card {
    padding: var(--space-6);
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .footer-social {
    justify-content: center;
  }

  .footer-brand p {
    max-width: 100%;
  }

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

  .about-image {
    aspect-ratio: 16/9;
  }

  .values-list {
    grid-template-columns: 1fr;
  }

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

  .product-hero-layout {
    grid-template-columns: 1fr;
  }

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

  .contact-form {
    padding: var(--space-6);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .page-hero {
    padding: calc(var(--header-height) + var(--space-10)) 0 var(--space-8);
  }

  .page-hero h1 {
    font-size: var(--text-3xl);
  }

  /* Search modal */
  .search-modal {
    width: 95%;
  }

  .search-overlay {
    padding-top: 80px;
  }

  /* Specs table responsive */
  .specs-table th,
  .specs-table td {
    display: block;
    width: 100%;
  }

  .specs-table th {
    border-bottom: none;
  }

  .specs-table tr {
    display: block;
    margin-bottom: var(--space-4);
    border: 1px solid var(--color-gray-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
  }

  /* CTA */
  .cta-content h2 {
    font-size: var(--text-3xl);
  }

  /* Scroll top */
  .scroll-top {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 44px;
    height: 44px;
  }
}

/* ============================================================
   RESPONSIVE — Small Mobile (< 480px)
   ============================================================ */
@media (max-width: 479px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .section-title {
    font-size: var(--text-3xl);
  }

  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
  }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  .site-header,
  .mobile-nav,
  .scroll-top,
  .search-overlay {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }
}

/* ============================================================
   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;
  }
}