/* ==========================================================================
   ARTDEVTECH - DIGITAL DEVELOPMENT STUDIO
   Design System & Master Stylesheet
   Website: artdevtech.online
   Theme: Premium Light Theme
   ========================================================================== */

/* --- Google Fonts Import (Inter with Cyrillic & Latin Support) --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* --- Design Tokens & CSS Variables --- */
:root {
  /* Color Palette - Premium Light Theme */
  --bg-main: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-subtle: #F1F5F9;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --bg-header-glass: rgba(248, 250, 252, 0.88);

  /* Text & Contrast */
  --text-main: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Primary & Secondary Brand Accents */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-glow: rgba(37, 99, 235, 0.22);
  
  --secondary: #4F46E5;
  --secondary-hover: #4338CA;
  --secondary-light: #EEF2FF;
  
  --accent-cyan: #06B6D4;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-purple: #8B5CF6;
  --accent-rose: #F43F5E;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #2563EB 0%, #4F46E5 100%);
  --grad-primary-hover: linear-gradient(135deg, #1D4ED8 0%, #4338CA 100%);
  --grad-subtle-blue: linear-gradient(135deg, #EFF6FF 0%, #EEF2FF 100%);
  --grad-accent-glow: linear-gradient(135deg, rgba(37, 99, 235, 0.12) 0%, rgba(79, 70, 229, 0.08) 100%);
  --grad-dark-card: linear-gradient(145deg, #0F172A 0%, #1E293B 100%);

  /* Borders & Dividers */
  --border-color: #E2E8F0;
  --border-focus: #2563EB;
  --border-light: #F1F5F9;

  /* Elevation Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 8px 16px -2px rgba(15, 23, 42, 0.06), 0 4px 8px -2px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 16px 32px -4px rgba(15, 23, 42, 0.08), 0 6px 16px -3px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 24px 48px -8px rgba(15, 23, 42, 0.12), 0 12px 24px -4px rgba(15, 23, 42, 0.06);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout Max Widths */
  --container-max: 1240px;
  --container-narrow: 840px;
  --header-height: 80px;

  /* Transitions */
  --trans-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --trans-base: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --trans-smooth: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

body.nav-locked, body.modal-locked {
  overflow: hidden;
}

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

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* Section Common Layout */
.section {
  padding: 96px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  border: 1px solid rgba(37, 99, 235, 0.16);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 3.6vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Buttons & UI Elements
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--trans-base);
  text-align: center;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--grad-primary);
  color: var(--text-inverse);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: var(--grad-primary-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.38);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-arrow {
  transition: transform var(--trans-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: transparent;
  transition: all var(--trans-base);
  display: flex;
  align-items: center;
}

.header.scrolled {
  background: var(--bg-header-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
  height: 72px;
}

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

/* Brand Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  line-height: 1;
}

.brand-symbol-img {
  width: 36px;
  height: 36px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px rgba(37, 99, 235, 0.22));
  transition: transform var(--trans-fast), filter var(--trans-fast);
}

.brand-logo:hover .brand-symbol-img,
.footer-logo:hover .brand-symbol-img {
  transform: scale(1.08);
  filter: drop-shadow(0 4px 14px rgba(37, 99, 235, 0.4));
}

.footer-symbol-img {
  width: 34px;
  height: 34px;
  filter: drop-shadow(0 2px 10px rgba(59, 130, 246, 0.35));
}

.brand-symbol {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  line-height: 1.05;
  margin: 0;
  padding: 0;
}

.brand-title span {
  color: var(--primary);
}

.brand-tagline {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-top: 3px;
  line-height: 1;
}

/* Desktop Nav */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--trans-fast);
}

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

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Language Switcher (Desktop) */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 3px;
  box-shadow: var(--shadow-xs);
}

.lang-btn {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: all var(--trans-fast);
}

.lang-btn:hover {
  color: var(--text-main);
}

.lang-btn.active {
  background: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

/* Hamburger Menu Toggle */
.mobile-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-main);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  z-index: 1100;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--trans-fast);
}

.mobile-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.mobile-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav Drawer */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--trans-base), visibility var(--trans-base);
}

.mobile-nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  position: fixed;
  top: 0;
  right: -360px;
  width: min(320px, 86vw);
  height: 100%;
  height: 100dvh;
  max-height: 100dvh;
  background: var(--bg-surface);
  box-shadow: -8px 0 32px rgba(15, 23, 42, 0.18);
  z-index: 1050;
  padding: calc(16px + env(safe-area-inset-top, 0px)) 16px calc(32px + env(safe-area-inset-bottom, 0px)) 16px;
  display: flex;
  flex-direction: column;
  transition: right var(--trans-smooth);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.mobile-nav.is-open {
  right: 0;
}

/* Mobile Nav Top Bar with Brand & Close Button */
.mobile-nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.mobile-nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-nav-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.mobile-nav-title span {
  color: var(--primary);
}

.mobile-nav-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-subtle);
  color: var(--text-main);
  transition: all var(--trans-fast);
  cursor: pointer;
  flex-shrink: 0;
}

.mobile-nav-close:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.mobile-nav-close:active {
  transform: scale(0.95);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex-shrink: 0;
}

.mobile-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--trans-fast);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  background: var(--bg-surface-subtle);
  color: var(--primary);
  padding-left: 16px;
}

.mobile-nav-cta {
  margin-top: 10px;
  width: 100%;
}

.mobile-lang-section {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  padding-bottom: 20px;
  flex-shrink: 0;
}

.mobile-lang-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.mobile-lang-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mobile-lang-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  transition: all var(--trans-fast);
  cursor: pointer;
}

.mobile-lang-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.mobile-lang-btn.active {
  background: rgba(37, 99, 235, 0.08);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 700;
}

/* ==========================================================================
   Hero Section (~85-90vh)
   ========================================================================== */
.hero-section {
  min-height: 88vh;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 64px;
  display: flex;
  align-items: center;
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.06) 0%, transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  border: 1px solid rgba(37, 99, 235, 0.2);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.12);
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.7);
  animation: badgePulse 2s infinite;
}

@keyframes badgePulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(37, 99, 235, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

.hero-title {
  font-size: clamp(2.4rem, 4.4vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-description {
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-tech-line {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xs);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hero-tech-dot {
  color: var(--primary);
}

/* Hero Visual Composition */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--border-color);
  box-shadow: 0 20px 48px -8px rgba(15, 23, 42, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.04);
  transition: transform var(--trans-smooth), box-shadow var(--trans-smooth);
}

.hero-visual:hover .hero-visual-img {
  transform: translateY(-4px) scale(1.008);
  box-shadow: 0 24px 56px -8px rgba(37, 99, 235, 0.18), 0 12px 24px -4px rgba(15, 23, 42, 0.06);
}

/* ==========================================================================
   Services Section (Bento Grid)
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  transition: all var(--trans-base);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity var(--trans-fast);
}

.service-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.service-card:hover::before {
  opacity: 1;
}

.service-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.service-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.service-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.service-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.service-features-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.service-feature-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.service-feature-tag::before {
  content: '✓';
  color: var(--primary);
  font-weight: 800;
  font-size: 0.75rem;
}

.service-request-btn {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
}

.service-request-btn:hover {
  color: var(--primary-hover);
}

.service-request-btn:hover span {
  transform: translateX(4px);
}

/* ==========================================================================
   Value Proposition Section
   ========================================================================== */
.value-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

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

.value-card {
  padding: 36px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  transition: all var(--trans-base);
  text-align: left;
}

.value-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.value-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 20px;
}

.value-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.value-card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--trans-fast);
}

.filter-btn:hover {
  color: var(--text-main);
  border-color: var(--text-secondary);
}

.filter-btn.active {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.project-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--trans-base);
}

.project-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
}

.project-media {
  position: relative;
  overflow: hidden;
  background: #F1F5F9;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--trans-smooth);
}

.project-card:hover .project-img {
  transform: scale(1.04);
}

.project-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-category-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.project-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.project-tagline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 14px;
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

.project-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.open-modal-btn {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.open-modal-btn:hover {
  color: var(--primary-hover);
}

/* Project Case Study Modal */
.modal-container {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--trans-base);
}

.modal-container.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  z-index: 10;
  padding: 40px;
  border: 1px solid var(--border-color);
  transform: translateY(20px);
  transition: transform var(--trans-smooth);
}

.modal-container.active .modal-content {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  transition: all var(--trans-fast);
}

.modal-close-btn:hover {
  background: var(--border-color);
}

.modal-img-wrap {
  width: 100%;
  height: clamp(220px, 32vw, 360px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 28px;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.modal-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.modal-metrics-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.modal-metric-card {
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  text-align: center;
}

.modal-metric-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.modal-metric-lbl {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.tech-pills-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 24px 0;
}

.tech-pill {
  padding: 5px 12px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
}

.modal-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.modal-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.check-icon {
  color: var(--accent-emerald);
  font-weight: 800;
  flex-shrink: 0;
}

/* ==========================================================================
   Technologies Section
   ========================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.tech-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--trans-base);
}

.tech-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.tech-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.tech-card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.tech-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
}

.tech-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.tech-items-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-subtle);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.tech-item-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* ==========================================================================
   Why ARTDEVTECH Section
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--trans-base);
  display: flex;
  flex-direction: column;
  text-align: left;
}

.why-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.why-stat {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
}

.why-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
}

.why-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Process Section
   ========================================================================== */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--trans-base);
  position: relative;
}

.process-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.process-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-light);
  display: inline-flex;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.process-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.process-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   FAQ Section (Accordion)
   ========================================================================== */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--trans-fast);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-surface-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform var(--trans-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: var(--text-inverse);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 26px 22px 26px;
}

/* ==========================================================================
   CTA Banner
   ========================================================================== */
.cta-banner-card {
  background: var(--grad-primary);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  color: var(--text-inverse);
  box-shadow: 0 20px 40px rgba(37, 99, 235, 0.28);
  position: relative;
  overflow: hidden;
}

.cta-banner-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.cta-banner-title {
  font-size: clamp(2rem, 3.4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}

.cta-banner-desc {
  font-size: clamp(1.05rem, 1.3vw, 1.2rem);
  max-width: 680px;
  margin: 0 auto 36px auto;
  opacity: 0.92;
  line-height: 1.65;
}

.cta-banner-btn {
  background: #FFFFFF;
  color: var(--primary);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.16);
}

.cta-banner-btn:hover {
  background: #F8FAFC;
  color: var(--primary-hover);
  transform: translateY(-2px);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.contact-section::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -60px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 36px;
  align-items: stretch;
  position: relative;
  z-index: 1;
}

/* Left Card: Direct Contact & Status */
.contact-info-card {
  background: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 38px 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  position: relative;
  transition: box-shadow var(--trans-fast), border-color var(--trans-fast);
}

.contact-info-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow-md);
}

.contact-info-top {
  display: flex;
  flex-direction: column;
}

/* Status Pill */
.contact-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  width: fit-content;
  margin-bottom: 20px;
}

.contact-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  position: relative;
}

.contact-status-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: #10B981;
  opacity: 0.4;
  animation: pulse-dot 2s cubic-bezier(0.455, 0.03, 0.515, 0.955) infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.8); opacity: 0; }
  100% { transform: scale(0.9); opacity: 0; }
}

.contact-info-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.contact-info-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* Channels List */
.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.contact-channel-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--trans-fast);
}

a.contact-channel-card:hover {
  background: #FFFFFF;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.08);
}

.contact-channel-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--trans-fast);
}

a.contact-channel-card:hover .contact-channel-icon {
  transform: scale(1.08);
}

.contact-channel-icon.email-icon {
  background: rgba(37, 99, 235, 0.1);
  color: #2563EB;
}

.contact-channel-icon.tg-icon {
  background: rgba(2, 132, 199, 0.1);
  color: #0284C7;
}

.contact-channel-icon.globe-icon {
  background: rgba(99, 102, 241, 0.1);
  color: #6366F1;
}

.contact-channel-content {
  flex: 1;
  min-width: 0;
}

.contact-channel-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.contact-channel-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contact-channel-arrow {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 600;
  transition: transform var(--trans-fast), color var(--trans-fast);
}

a.contact-channel-card:hover .contact-channel-arrow {
  color: var(--primary);
  transform: translateX(4px);
}

/* Guarantees / Trust Badges Bottom Strip */
.contact-guarantees {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.guarantee-check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ECFDF5;
  color: #059669;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Right Card: Interactive Form */
.contact-form-card {
  background: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 38px 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  transition: box-shadow var(--trans-fast), border-color var(--trans-fast);
}

.contact-form-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow-md);
}

.form-row-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 18px;
  position: relative;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 7px;
}

.input-with-icon {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-icon .field-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--trans-fast);
}

.input-with-icon.textarea-icon-wrap .field-icon {
  top: 18px;
  transform: none;
}

.input-with-icon .form-input,
.input-with-icon .form-select {
  padding-left: 44px;
}

.input-with-icon .form-textarea {
  padding-left: 44px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-color);
  background: var(--bg-main);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--trans-fast);
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: #FFFFFF;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.input-with-icon:focus-within .field-icon {
  color: var(--primary);
}

.form-textarea {
  resize: vertical;
  min-height: 125px;
  line-height: 1.5;
}

.form-error-msg {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-rose);
  margin-top: 4px;
  min-height: 16px;
}

.form-group.has-error .form-input,
.form-group.has-error .form-select,
.form-group.has-error .form-textarea {
  border-color: var(--accent-rose);
  background: #FFF1F2;
}

.form-status-alert {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.form-status-alert.success {
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.form-status-alert.error {
  background: #FFF1F2;
  border: 1px solid #FECDD3;
  color: #9F1239;
}

.contact-submit-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 28px;
  font-size: 1.02rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  margin-top: 6px;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary) 0%, #1D4ED8 100%);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
  transition: all var(--trans-fast);
}

.contact-submit-btn:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #1E40AF 100%);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.38);
  transform: translateY(-1px);
}

.contact-submit-btn:active {
  transform: translateY(0);
}

.contact-submit-btn .btn-arrow {
  transition: transform var(--trans-fast);
}

.contact-submit-btn:hover .btn-arrow {
  transform: translateX(4px);
}

.form-privacy-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 14px;
  text-align: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: #0F172A;
  color: #94A3B8;
  padding: 80px 0 32px 0;
  border-top: 1px solid #1E293B;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand-wrap {
  display: flex;
  flex-direction: column;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  text-decoration: none;
}

.footer-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #FFFFFF;
}

.footer-brand-title span {
  color: var(--primary);
}

.footer-desc {
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.footer-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #34D399;
  font-size: 0.8rem;
  font-weight: 600;
}

.footer-col-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FFFFFF;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.9rem;
  color: #94A3B8;
  transition: color var(--trans-fast);
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-social-links {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.social-icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: #1E293B;
  border: 1px solid #334155;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--trans-fast);
}

.social-icon-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #1E293B;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   Scroll Reveal Animation
   ========================================================================== */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #FFFFFF;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

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

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-content {
    align-items: center;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .why-grid, .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
  }
}

@media (max-width: 900px) {
  .desktop-nav, 
  .header-actions .btn-primary, 
  .header-actions .lang-switcher {
    display: none !important;
  }
  .mobile-toggle {
    display: flex;
  }
  .services-grid, .projects-grid, .contact-grid {
    grid-template-columns: 1fr;
  }
  .value-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .header-container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .brand-tagline {
    display: none;
  }
  .brand-title {
    font-size: 1.15rem;
  }
  .header-actions {
    gap: 8px;
  }
  .section {
    padding: 64px 0;
  }
  .why-grid, .process-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .service-card, .project-body, .contact-form-card, .contact-info-card {
    padding: 24px 18px;
  }
  .form-row-dual {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .cta-banner-card {
    padding: 36px 20px;
  }
  .cta-banner-actions {
    flex-direction: column;
    width: 100%;
  }
  .cta-banner-actions .btn {
    width: 100%;
  }
  .modal-content {
    padding: 20px;
  }
  .hero-title {
    font-size: clamp(2rem, 8.5vw, 2.6rem);
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-badge {
    font-size: 0.72rem;
    padding: 6px 12px;
    max-width: 100%;
    white-space: normal;
  }
}

@media (max-width: 480px) {
  .brand-symbol-img {
    width: 28px;
    height: 28px;
  }
  .brand-title {
    font-size: 1.05rem;
  }
  .mobile-toggle {
    width: 38px;
    height: 38px;
    padding: 7px;
  }
}