/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #0D1F3C;      /* Deep Midnight Blue */
  --color-primary-light: #1A365D;
  --color-accent: #E8821A;       /* Energy Orange */
  --color-accent-hover: #D07011;
  --color-white: #FFFFFF;
  --color-bg-light: #F4F6F9;     /* Soft Light Gray */
  --color-text: #3A3A3A;         /* Charcoal for readability */
  --color-text-light: #6C7A8E;
  --color-text-white-muted: #B3C1D2;
  --color-border: #E2E8F0;
  
  /* Fonts */
  --font-primary: 'Inter', sans-serif;
  --font-display: 'Syne', sans-serif;
  
  /* Layout & Spacing */
  --container-width: 1200px;
  --header-height: 80px;
  --header-height-scrolled: 70px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 12px;
  --shadow-sm: 0 2px 8px rgba(13, 31, 60, 0.05);
  --shadow-md: 0 8px 30px rgba(13, 31, 60, 0.08);
  --shadow-lg: 0 16px 40px rgba(13, 31, 60, 0.12);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height-scrolled);
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

/* ==========================================================================
   UTILITY CLASSES & GRID SYSTEM
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 80px 0;
}

@media (min-width: 768px) {
  .section-padding {
    padding: 100px 0;
  }
}

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

.section-header {
  max-width: 700px;
  margin: 0 auto 50px auto;
  text-align: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.75rem;
  }
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-primary);
}

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

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 130, 26, 0.4);
}

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

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   HEADER / NAVBAR
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-white);
  z-index: 1000;
  transition: var(--transition);
  display: flex;
  align-items: center;
}

.header.scrolled {
  height: var(--header-height-scrolled);
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo img {
  height: 52px;
  width: auto;
  transition: var(--transition);
  filter: drop-shadow(0 2px 6px rgba(13, 31, 60, 0.08));
}

.logo:hover img {
  transform: scale(1.05);
}

.header.scrolled .logo img {
  height: 44px;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
  white-space: nowrap;
  transition: var(--transition);
}

.logo-text-accent {
  color: var(--color-accent);
}

.logo:hover .logo-text {
  color: var(--color-accent);
}

.logo:hover .logo-text-accent {
  color: var(--color-primary);
}

.header.scrolled .logo-text {
  font-size: 1.2rem;
}

@media (max-width: 480px) {
  .logo {
    gap: 8px;
  }
  .logo img {
    height: 44px;
  }
  .header.scrolled .logo img {
    height: 38px;
  }
  .logo-text {
    font-size: 1.1rem;
  }
  .header.scrolled .logo-text {
    font-size: 1rem;
  }
}

.nav-menu {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--color-primary);
  font-size: 0.95rem;
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: var(--transition);
}

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

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

.nav-cta {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 10px 20px;
  border-radius: var(--border-radius);
  font-weight: 600;
}

.nav-cta:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* Mobile Toggle Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1010;
}

.hamburger span {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: left center;
}

/* Mobile responsive menu */
@media (max-width: 991px) {
  .hamburger {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    justify-content: flex-start;
    padding: 100px 40px 40px 40px;
    gap: 24px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    align-items: flex-start;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg);
  }
  
  .hamburger.active span:nth-child(2) {
    width: 0%;
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg);
  }
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: var(--header-height);
  display: flex;
  align-items: center;
  background-image: linear-gradient(rgba(13, 31, 60, 0.65), rgba(13, 31, 60, 0.65)), url('Installazione fotovoltaico.avif');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--color-white);
  overflow: hidden;
}

/* Fallback background if image is not loaded */
.hero-fallback {
  background-color: var(--color-primary);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 4.25rem;
  }
}

.hero p {
  font-size: 1.15rem;
  font-weight: 300;
  max-width: 650px;
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.9);
}

@media (min-width: 768px) {
  .hero p {
    font-size: 1.35rem;
  }
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* SVG circuit animation overlay */
.hero-circuit-container {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 150px;
  z-index: 5;
  pointer-events: none;
}

.hero-circuit {
  width: 100%;
  height: 100%;
}

.circuit-bg {
  stroke: rgba(255, 255, 255, 0.06);
}

.circuit-animated {
  stroke-dasharray: 800;
  stroke-dashoffset: 800;
  animation: drawCircuit 7s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.circuit-node {
  animation: pulseNode 3s infinite ease-in-out;
  transform-origin: center;
}

@keyframes drawCircuit {
  0% {
    stroke-dashoffset: 800;
  }
  45%, 55% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: -800;
  }
}

@keyframes pulseNode {
  0%, 100% {
    transform: scale(1);
    opacity: 0.5;
    filter: drop-shadow(0 0 1px var(--color-accent));
  }
  50% {
    transform: scale(1.3);
    opacity: 1;
    filter: drop-shadow(0 0 6px var(--color-accent));
  }
}

/* ==========================================================================
   SERVIZI SECTION
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  max-width: 860px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.service-card {
  background-color: var(--color-white);
  padding: 50px 36px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

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

.service-icon {
  width: 60px;
  height: 60px;
  background-color: var(--color-bg-light);
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 24px;
  transition: var(--transition);
}

.service-card:hover .service-icon {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.service-icon svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 14px;
  font-weight: 600;
}

.service-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Featured card variant (fotovoltaico) */
.service-card--featured {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), var(--shadow-md);
}

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

.service-card-badge {
  display: inline-block;
  background: linear-gradient(90deg, var(--color-accent), #f5a623);
  color: var(--color-white);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 18px;
  align-self: flex-start;
}

.service-card-desc {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

/* Feature list inside cards */
.service-features {
  list-style: none;
  margin: 0 0 28px 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.service-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-text);
  font-weight: 500;
}

.feat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  flex-shrink: 0;
}

/* CTA link inside card */
.service-cta {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: var(--transition);
}

.service-cta:hover {
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.service-cta--accent {
  color: var(--color-accent);
}

.service-cta--accent:hover {
  color: var(--color-primary);
}

/* Trust strip */
.services-trust-strip {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  margin-top: 56px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg-light);
  overflow: hidden;
}

@media (min-width: 768px) {
  .services-trust-strip {
    flex-direction: row;
  }
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 32px 28px;
  flex: 1;
}

.trust-icon {
  font-size: 1.8rem;
  margin-bottom: 4px;
}

.trust-item strong {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 700;
}

.trust-item span {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

.trust-divider {
  width: 100%;
  height: 1px;
  background-color: var(--color-border);
}

@media (min-width: 768px) {
  .trust-divider {
    width: 1px;
    height: auto;
  }
}



/* ==========================================================================
   ENERGIA RINNOVABILE SECTION
   ========================================================================== */
.renewable {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.renewable-badge {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
}

.renewable .section-title {
  color: var(--color-white);
}

.renewable .section-subtitle {
  color: var(--color-text-white-muted);
}

.renewable-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 50px;
  align-items: center;
}

@media (min-width: 1024px) {
  .renewable-wrapper {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.renewable-content h3 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin-bottom: 20px;
  font-weight: 600;
  color: var(--color-accent);
}

.renewable-content p {
  font-size: 1.05rem;
  color: var(--color-text-white-muted);
  margin-bottom: 24px;
}

.renewable-highlights {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 30px;
}

@media (min-width: 600px) {
  .renewable-highlights {
    grid-template-columns: repeat(2, 1fr);
  }
}

.highlight-item {
  display: flex;
  gap: 16px;
}

.highlight-icon {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 4px;
}

.highlight-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.highlight-text h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-white);
}

.highlight-text p {
  font-size: 0.9rem;
  color: var(--color-text-white-muted);
  margin-bottom: 0;
}

.renewable-image {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4 / 3;
}

.renewable-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.renewable-image-fallback {
  width: 100%;
  height: 100%;
  background-color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--color-white);
}

/* ==========================================================================
   CHI SIAMO SECTION
   ========================================================================== */
.about {
  background-color: var(--color-bg-light);
}

.about-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 50px;
  align-items: center;
}

@media (min-width: 1024px) {
  .about-wrapper {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

.about-image {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  aspect-ratio: 4 / 3;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-image-fallback {
  width: 100%;
  height: 100%;
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--color-white);
}

.about-content h3 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 20px;
  font-weight: 600;
}

.about-content p {
  margin-bottom: 24px;
  color: var(--color-text-light);
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 32px;
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.stat-item h4 {
  font-family: var(--font-display);
  font-size: 2.25rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1;
}

.stat-item p {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 0;
}

/* ==========================================================================
   CONTATTI SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.contact-card {
  background-color: var(--color-white);
  padding: 40px 24px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: var(--transition);
}

.contact-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

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

.contact-icon {
  width: 60px;
  height: 60px;
  background-color: var(--color-bg-light);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  margin-bottom: 24px;
  transition: var(--transition);
}

.contact-card:hover .contact-icon {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.contact-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 8px;
  font-weight: 600;
}

.contact-role {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.contact-value {
  font-size: 1.05rem;
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.5;
}

.contact-value a:hover {
  color: var(--color-accent);
}

.email-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.email-entry {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.email-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.email-address {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  word-break: break-all;
  transition: var(--transition);
}

.email-address:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 60px 0 30px 0;
  border-top: 4px solid var(--color-accent);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo img {
  height: 44px;
  width: auto;
  transition: var(--transition);
}

.footer-logo:hover img {
  transform: scale(1.05);
}

.logo-text--footer {
  color: var(--color-white);
}

.footer-logo:hover .logo-text--footer {
  color: var(--color-accent);
}

.footer-logo:hover .logo-text-accent {
  color: var(--color-white);
}

.footer-about p {
  color: var(--color-text-white-muted);
  font-size: 0.9rem;
  max-width: 300px;
  margin-bottom: 16px;
}

.footer-piva {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 20px;
  position: relative;
}

.footer-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 30px;
  height: 2px;
  background-color: var(--color-accent);
}

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

.footer-links a {
  color: var(--color-text-white-muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--color-text-white-muted);
  font-size: 0.9rem;
}

.footer-contact-info span {
  display: block;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.copyright {
  font-size: 0.85rem;
  color: var(--color-text-white-muted);
}

.footer-legal {
  display: flex;
  gap: 20px;
}

.footer-legal a {
  font-size: 0.85rem;
  color: var(--color-text-white-muted);
}

.footer-legal a:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   ANIMATIONS & SCROLL EFFECTS
   ========================================================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger transition delay for children */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }