/*
 * NK Environnement - Modern CSS
 * Version 2.0 - Décembre 2024
 * Refonte complète avec variables CSS, dark mode, et design moderne
 */

/* ============================================
   CSS VARIABLES - DESIGN TOKENS
   ============================================ */

:root {
  /* Couleurs primaires */
  --color-primary: #1CBAC8;
  --color-primary-dark: #18a3b0;
  --color-primary-light: #3fc9d5;
  --color-primary-glow: rgba(28, 186, 200, 0.4);

  /* Mode clair */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: #ffffff;
  --color-surface: #f1f5f9;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;

  /* Overlay */
  --overlay-dark: rgba(15, 23, 42, 0.7);
  --overlay-light: rgba(255, 255, 255, 0.9);

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

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(12px);

  /* Espacements */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Bordures */
  --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: 250ms ease;
  --transition-slow: 350ms ease;

  /* Typographie */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Inter', sans-serif;

  /* Header */
  --header-height: 70px;
}

/* ============================================
   DARK MODE
   ============================================ */

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-card: #1e293b;
  --color-surface: #334155;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-text-light: #64748b;
  --color-border: #334155;

  --overlay-dark: rgba(0, 0, 0, 0.8);
  --overlay-light: rgba(30, 41, 59, 0.95);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);

  --glass-bg: rgba(30, 41, 59, 0.8);
  --glass-border: rgba(51, 65, 85, 0.5);
}

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

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

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

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

ul,
ol {
  list-style: none;
}

/* ============================================
   UTILITIES
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-padding {
  padding: var(--spacing-3xl) 0;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   PRELOADER
   ============================================ */

.preloader {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.preloader.loaded {
  opacity: 0;
  visibility: hidden;
}

.preloader .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: transparent;
  backdrop-filter: none;
  transition: all var(--transition-base);
  z-index: -1;
}

.navbar.scrolled::before {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

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

.navbar-brand img {
  height: 40px;
  width: auto;
  transition: transform var(--transition-fast);
}

/* Logo switching for light/dark mode */
.logo-dark {
  display: none;
}

.logo-light {
  display: block;
}

[data-theme="dark"] .logo-dark {
  display: block;
}

[data-theme="dark"] .logo-light {
  display: none;
}

.navbar-brand:hover img {
  transform: scale(1.05);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.navbar.scrolled .navbar-nav a {
  color: var(--color-text);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--color-primary);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-full);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.navbar.scrolled .theme-toggle {
  color: var(--color-text);
}

.theme-toggle:hover {
  background: var(--color-primary);
  color: #fff;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

/* Mobile Menu Toggle */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.navbar.scrolled .navbar-toggle span {
  background: var(--color-text);
}

@media (max-width: 768px) {
  .navbar-toggle {
    display: flex;
  }

  .navbar-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }

  .navbar-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .navbar-nav a {
    color: var(--color-text);
    width: 100%;
    text-align: center;
    padding: var(--spacing-md);
  }
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.8) 0%, rgba(28, 186, 200, 0.3) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--spacing-lg);
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-2xl);
  font-weight: 300;
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: #fff;
}

.btn-outline:hover {
  background: #fff;
  color: var(--color-text);
  transform: translateY(-2px);
}

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

.btn-outline-dark:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ============================================
   CTA BANNER
   ============================================ */

.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: var(--spacing-xl) 0;
}

.cta-banner .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2xl);
  flex-wrap: wrap;
}

.cta-banner h4 {
  color: #fff;
  font-size: 1.25rem;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cta-banner .btn {
  background: transparent;
  border-color: #fff;
  color: #fff;
}

.cta-banner .btn:hover {
  background: #fff;
  color: var(--color-primary);
}

/* ============================================
   SECTION TITLE
   ============================================ */

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-title h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.section-title h2 span {
  color: var(--color-primary);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  margin: var(--spacing-lg) auto 0;
  border-radius: var(--radius-full);
}

.section-title-light h2 {
  color: #fff;
}

/* ============================================
   ABOUT / WHY CHOOSE US
   ============================================ */

.why-section {
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.why-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--overlay-dark);
}

.why-section .container {
  position: relative;
  z-index: 1;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.why-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
}

.why-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  background: rgba(28, 186, 200, 0.1);
}

.why-card-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  font-size: 1.75rem;
  color: var(--color-primary);
}

.why-card h4 {
  color: #fff;
  font-size: 1.125rem;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

.why-card p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ============================================
   SERVICES
   ============================================ */

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.service-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  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-primary-light));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

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

.service-card-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: calc(-1 * var(--spacing-xl)) auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-full);
  font-size: 1.75rem;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

.service-card h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.service-card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ============================================
   PORTFOLIO / GALLERY
   ============================================ */

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

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.portfolio-item {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
}

.portfolio-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.portfolio-item:hover img {
  transform: scale(1.1);
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(28, 186, 200, 0.9), transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.portfolio-item:hover .portfolio-overlay {
  opacity: 1;
}

.portfolio-overlay i,
.portfolio-overlay svg {
  width: 48px;
  height: 48px;
  color: #fff;
  font-size: 2rem;
}

/* ============================================
   TEAM
   ============================================ */

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

.team-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-2xl);
}

.team-member {
  text-align: center;
  max-width: 280px;
}

.team-member-photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  margin: 0 auto var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  border: 4px solid var(--color-border);
  transition: all var(--transition-base);
}

.team-member:hover .team-member-photo {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.team-member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-member h4 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.team-member h6 {
  color: var(--color-text-muted);
  font-weight: 400;
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.team-social {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.team-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  transition: all var(--transition-fast);
}

.team-social a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   CONTACT
   ============================================ */

.contact-hero {
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.contact-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--overlay-dark);
}

.contact-hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-top: var(--header-height);
}

.contact-hero h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: #fff;
  text-transform: uppercase;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.breadcrumb a,
.breadcrumb span {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
}

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

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

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
}

.contact-info h4,
.contact-form h4,
.contact-map h4 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.contact-info p {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}

.contact-info p i,
.contact-info p svg {
  color: var(--color-primary);
  width: 20px;
  flex-shrink: 0;
  margin-top: 3px;
}

/* Form */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-glow);
}

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

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Map */
.contact-map iframe {
  width: 100%;
  height: 350px;
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  text-align: center;
}

.footer-logo {
  display: inline-block;
  margin-bottom: var(--spacing-lg);
}

.footer-logo img {
  height: 50px;
  width: auto;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-social a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  transform: translateY(-3px) scale(1.1);
  box-shadow: var(--shadow-glow);
}

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

.footer-copyright a {
  color: var(--color-primary);
}

.footer-links {
  margin-top: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

/* ============================================
   MENTIONS LÉGALES
   ============================================ */

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  padding-top: calc(var(--header-height) + var(--spacing-3xl));
}

.legal-content h2 {
  font-size: 1.5rem;
  margin: var(--spacing-2xl) 0 var(--spacing-md);
  color: var(--color-text);
}

.legal-content h2 span {
  color: var(--color-primary);
}

.legal-content p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.legal-content p span {
  font-weight: 600;
  color: var(--color-text);
}

/* ============================================
   LIGHTBOX / POPUP
   ============================================ */

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 90vh;
  border-radius: var(--radius-lg);
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1.5rem;
  transition: all var(--transition-fast);
}

.lightbox-close:hover {
  transform: scale(1.1);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}

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

.lightbox-prev {
  left: var(--spacing-lg);
}

.lightbox-next {
  right: var(--spacing-lg);
}

/* ============================================
   ANIMATIONS
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .hero {
    min-height: 100svh;
    background-attachment: scroll;
  }

  .why-section,
  .contact-hero {
    background-attachment: scroll;
  }

  .cta-banner .container {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-lg);
  }

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

@media (max-width: 480px) {
  :root {
    --spacing-3xl: 2.5rem;
  }

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

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border-left: 4px solid var(--color-primary);
  z-index: 3000;
  transform: translateX(120%);
  opacity: 0;
  transition: all var(--transition-base);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast-success {
  border-left-color: #22c55e;
}

.toast-error {
  border-left-color: #ef4444;
}

.toast-message {
  color: var(--color-text);
  font-size: 0.9375rem;
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 0;
  line-height: 1;
  transition: color var(--transition-fast);
}

.toast-close:hover {
  color: var(--color-text);
}

@media (max-width: 480px) {
  .toast {
    left: var(--spacing-md);
    right: var(--spacing-md);
    bottom: var(--spacing-md);
  }
}

/* ============================================
   FORM ERROR STYLES
   ============================================ */

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
  animation: shake 0.4s ease;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-5px);
  }

  75% {
    transform: translateX(5px);
  }
}

/* Button loading state */
button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}