/* ============================================================
   FDK Generator - 深圳市富东康发电机有限公司
   主样式表 | 移动优先 | SEO/GEO优化
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Primary Palette */
  --color-primary: #1a56db;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  --color-primary-bg: #eff6ff;

  /* Accent */
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;
  --color-accent-light: #fbbf24;
  --color-accent-bg: #fffbeb;

  /* Neutrals */
  --color-dark: #1f2937;
  --color-gray-900: #111827;
  --color-gray-700: #374151;
  --color-gray-500: #6b7280;
  --color-gray-300: #d1d5db;
  --color-gray-200: #e5e7eb;
  --color-gray-100: #f3f4f6;
  --color-gray-50: #f9fafb;
  --color-white: #ffffff;

  /* Semantic */
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
  --border-radius-sm: 4px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-gray-700);
  background: var(--color-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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; }

h1, h2, h3, h4, h5, h6 {
  color: var(--color-gray-900);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-sm);
  z-index: 10000;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: var(--space-sm); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-gray-900);
  white-space: nowrap;
}
.logo:hover { color: var(--color-primary); }
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 800;
  flex-shrink: 0;
}

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

.nav-list a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-gray-700);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}
.nav-list a:hover,
.nav-list a.active {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > a::after {
  content: "▾";
  margin-left: 2px;
  font-size: 0.7em;
}
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
}

/* CTA Button */
.header-cta {
  background: var(--color-accent);
  color: var(--color-white) !important;
  padding: var(--space-sm) var(--space-lg) !important;
  border-radius: var(--border-radius) !important;
  font-weight: 600 !important;
  transition: background var(--transition-fast);
}
.header-cta:hover {
  background: var(--color-accent-dark) !important;
  color: var(--color-white) !important;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
  background: none;
  border: none;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  background: linear-gradient(135deg, #1e3a5f 0%, #1a56db 50%, #1e40af 100%);
  color: var(--color-white);
  padding: var(--space-4xl) 0;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 5 L55 30 L30 55 L5 30Z' fill='none' stroke='rgba(255,255,255,0.04)' stroke-width='1'/%3E%3C/svg%3E") repeat;
  opacity: 0.5;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-size: clamp(1.75rem, 5vw, var(--font-size-5xl));
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}
.hero p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}
.hero-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}
.hero .btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}
.hero .btn-primary:hover { background: var(--color-accent-dark); }
.hero .btn-outline {
  border: 2px solid var(--color-white);
  color: var(--color-white);
  background: transparent;
}
.hero .btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  margin-top: var(--space-3xl);
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat-number {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-accent-light);
  line-height: 1;
}
.hero-stat-label {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  margin-top: var(--space-xs);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

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

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn-accent:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
}

.btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-lg { padding: 1rem 2rem; font-size: var(--font-size-lg); }
.btn-sm { padding: 0.5rem 1rem; font-size: var(--font-size-sm); }

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: var(--space-4xl) 0;
}

.section-alt {
  background: var(--color-gray-50);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  margin: var(--space-md) auto 0;
  border-radius: 2px;
}
.section-header p {
  color: var(--color-gray-500);
  font-size: var(--font-size-lg);
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-300);
  font-size: 3rem;
  overflow: hidden;
}
.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: var(--space-lg);
}

.card-body h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.card-body p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
}

/* ============================================================
   PRODUCT / BRAND CARDS
   ============================================================ */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-lg);
}

.brand-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
}
.brand-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.brand-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
}

.brand-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.brand-card p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  margin-bottom: var(--space-md);
}

.brand-specs {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  background: var(--color-gray-50);
  padding: var(--space-sm);
  border-radius: var(--border-radius-sm);
}

/* ============================================================
   SERVICE CARDS
   ============================================================ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-xl);
}

.service-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.service-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-lg);
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.service-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}
.service-card p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ============================================================
   ADVANTAGE / FEATURE LIST
   ============================================================ */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
}

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

.advantage-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--color-primary-bg);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: var(--font-size-xl);
}

.advantage-text h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
}
.advantage-text p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb {
  padding: var(--space-md) 0;
  background: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-200);
}

.breadcrumb ol {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-sm);
  color: var(--color-gray-300);
}

.breadcrumb a { color: var(--color-gray-500); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] {
  color: var(--color-gray-900);
  font-weight: 500;
}

/* ============================================================
   PAGE HEADER (Inner Pages)
   ============================================================ */
.page-header {
  background: linear-gradient(135deg, #1e3a5f 0%, #1a56db 100%);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
  font-size: clamp(1.5rem, 4vw, var(--font-size-3xl));
  margin-bottom: var(--space-sm);
}
.page-header p {
  opacity: 0.85;
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   CONTENT SECTION (Inner Pages)
   ============================================================ */
.content-section {
  padding: var(--space-3xl) 0;
}

.content-section h2 {
  margin: var(--space-2xl) 0 var(--space-md);
  font-size: var(--font-size-2xl);
}
.content-section h2:first-child { margin-top: 0; }

.content-section h3 {
  margin: var(--space-xl) 0 var(--space-sm);
  font-size: var(--font-size-xl);
}

.content-section p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.content-section ul:not(.nav-list) {
  list-style: disc;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
}
.content-section ul li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.content-section ol {
  list-style: decimal;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
}
.content-section ol li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

/* ============================================================
   TABLE
   ============================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0 var(--space-xl);
  font-size: var(--font-size-sm);
}

.data-table thead {
  background: var(--color-primary);
  color: var(--color-white);
}

.data-table th {
  padding: var(--space-md);
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.data-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.data-table tbody tr:nth-child(even) {
  background: var(--color-gray-50);
}

.data-table tbody tr:hover {
  background: var(--color-primary-bg);
}

/* Responsive table wrapper */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-lg) 0;
}

/* ============================================================
   FAQ ACCORDION
   ============================================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-md);
  overflow: hidden;
  background: var(--color-white);
}

.faq-question {
  width: 100%;
  padding: var(--space-lg);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-gray-900);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}
.faq-question:hover { color: var(--color-primary); }

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  border: 2px solid var(--color-gray-300);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  transition: all var(--transition-fast);
}
.faq-item.active .faq-icon {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}
.faq-item.active .faq-answer { max-height: 500px; }

.faq-answer-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-gray-700);
  line-height: 1.8;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section {
  background: linear-gradient(135deg, #1a56db 0%, #1e40af 100%);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}
.cta-section p {
  opacity: 0.9;
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-lg);
}

.cta-section .btn {
  background: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-lg);
  padding: 1rem 2.5rem;
}
.cta-section .btn:hover { background: var(--color-accent-dark); }

/* ============================================================
   CONTACT INFO / CARD
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.contact-info h3 {
  margin-bottom: var(--space-lg);
}

.contact-item {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  align-items: flex-start;
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--color-primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: var(--font-size-lg);
}

.contact-item-text strong {
  display: block;
  color: var(--color-gray-900);
  margin-bottom: 2px;
}
.contact-item-text span {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* Contact Form */
.contact-form {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
}

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

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: border-color var(--transition-fast);
  background: var(--color-white);
}

.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 var(--color-primary-bg);
}

/* ============================================================
   CASE / CASE STUDY
   ============================================================ */
.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.case-card:hover {
  box-shadow: var(--shadow-lg);
}

.case-image {
  aspect-ratio: 16/9;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-300);
  font-size: 3rem;
  overflow: hidden;
}
.case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-body {
  padding: var(--space-lg);
}

.case-body h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.case-meta {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  flex-wrap: wrap;
}

.case-tag {
  display: inline-block;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  padding: 2px var(--space-sm);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

/* ============================================================
   PROCESS / TIMELINE
   ============================================================ */
.process-list {
  counter-reset: process;
  max-width: 800px;
  margin: 0 auto;
}

.process-item {
  counter-increment: process;
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  position: relative;
}

.process-item::before {
  content: counter(process, decimal-leading-zero);
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--font-size-lg);
}

.process-content h4 {
  margin-bottom: var(--space-xs);
}
.process-content p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-3xl) 0 var(--space-xl);
}

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

.footer-col h4 {
  color: var(--color-white);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-lg);
}

.footer-col p {
  font-size: var(--font-size-sm);
  line-height: 1.8;
}

.footer-col a {
  display: block;
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--color-accent-light); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ============================================================
   PROJECT SCOPE BADGE
   ============================================================ */
.scope-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================================
   UTILITY
   ============================================================ */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-primary { color: var(--color-primary); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.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;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }

  .section { padding: var(--space-2xl) 0; }

  .container { padding: 0 var(--space-md); }

  /* Mobile Nav */
  .menu-toggle { display: flex; }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition);
    overflow-y: auto;
    z-index: 999;
  }
  .main-nav.open { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }
  .nav-list a {
    padding: var(--space-md);
    font-size: var(--font-size-base);
    border-bottom: 1px solid var(--color-gray-100);
  }

  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding-left: var(--space-lg);
    display: none;
  }
  .nav-dropdown-menu.show { display: block; }

  .header-cta {
    margin-top: var(--space-md);
    text-align: center;
  }

  /* Hero */
  .hero { padding: var(--space-3xl) 0; }
  .hero-stats { gap: var(--space-xl); }
  .hero-stat-number { font-size: var(--font-size-3xl); }

  /* Grids */
  .card-grid,
  .service-grid,
  .brand-grid,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

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