/*
 * VoltAIR Website Stylesheet
 *
 * This stylesheet defines the core look and feel for the VoltAIR website.
 * Colours, typography and layout are configured here to match the brand
 * requirements: sustainable green (#0EA864), dark forest (#052E1D), light
 * mint (#F0FFF5) and neutral grey (#F4F6F8). The design emphasises clean
 * layouts with generous whitespace, rounded corners and a modern sans-serif
 * typeface. The file also includes basic responsive rules to ensure the
 * site remains usable on both desktop and mobile devices.
 */

/* CSS variables for colour palette */
:root {
  --primary: #0EA864;
  --dark: #052E1D;
  --light: #F0FFF5;
  --grey: #F4F6F8;
  --accent: #13C17D; /* slightly lighter green for hover states */
  --radius: 8px;
}

/* Global reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', 'Poppins', Arial, sans-serif;
  background-color: var(--light);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

header {
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
}

.nav-links a:hover {
  background-color: var(--grey);
}

.cta-btn {
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  margin-left: 0.5rem;
  transition: background-color 0.2s ease;
}

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

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

/* Hero Section */
.hero {
  position: relative;
  background-size: cover;
  background-position: center;
  color: #ffffff;
  padding: 6rem 0;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 46, 29, 0.6);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-buttons .cta-primary,
.hero-buttons .cta-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
}

.hero-buttons .cta-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.hero-buttons .cta-secondary {
  background-color: rgba(255,255,255,0.9);
  color: var(--dark);
}

.hero-buttons .cta-primary:hover {
  background-color: var(--accent);
}

.hero-buttons .cta-secondary:hover {
  background-color: #ffffff;
}

/* Trust bar */
.trust-bar {
  background-color: #ffffff;
  border-top: 1px solid var(--grey);
  border-bottom: 1px solid var(--grey);
  padding: 1rem 0;
}

.trust-items {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  font-size: 0.9rem;
  color: var(--dark);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.trust-item i {
  color: var(--primary);
}

/* Section titles */
section {
  padding: 4rem 0;
}

section h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--dark);
}

/* Solutions */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.solution-card {
  background-color: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0,0,0,0.08);
}

.solution-card i {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.solution-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.solution-card p {
  flex-grow: 1;
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: #555;
}

.solution-card a {
  align-self: flex-start;
  font-weight: 500;
  color: var(--primary);
}

.solution-card a:hover {
  color: var(--accent);
}

/* How it works */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.step {
  background-color: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.2s ease;
}

.step:hover {
  transform: translateY(-4px);
}

.step i {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.step h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.step p {
  font-size: 0.95rem;
  color: #555;
}

/* Impact metrics */
.metrics {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  margin-top: 2rem;
}

.metric {
  background-color: #ffffff;
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.metric strong {
  display: block;
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.metric span {
  font-size: 0.95rem;
  color: #555;
}

/* Case studies */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.case-card {
  background-color: #ffffff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: transform 0.2s ease;
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  transform: translateY(-4px);
}

.case-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.case-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.case-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.case-content p {
  flex-grow: 1;
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 0.5rem;
}

.case-content .testimonial {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--dark);
}

/* Pricing */
.pricing-table {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.plan {
  background-color: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.plan h3 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.plan .price {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.plan ul {
  list-style: none;
  margin: 1rem 0;
}

.plan ul li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: #555;
}

.plan button {
  margin-top: auto;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  background-color: var(--primary);
  color: #ffffff;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.plan button:hover {
  background-color: var(--accent);
}

/* About */
.about-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.about-content p {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1rem;
  color: #555;
}

.team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.team-member {
  background-color: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1rem;
  text-align: center;
}

.team-member img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 0.5rem;
}

.team-member h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--dark);
}

.team-member span {
  font-size: 0.85rem;
  color: #777;
}

/* FAQs */
.faq-item {
  margin-bottom: 1rem;
  border-radius: var(--radius);
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1rem;
}

.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  color: var(--dark);
}

.faq-item p {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: #555;
}

/* Contact */
.contact-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.contact-form, .contact-info {
  flex: 1 1 300px;
  background-color: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  padding: 1.5rem;
}

.contact-form h3 {
  margin-bottom: 1rem;
  color: var(--dark);
}

.contact-form form {
  display: grid;
  gap: 1rem;
}

.contact-form label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--grey);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.contact-form textarea {
  min-height: 120px;
  resize: vertical;
}

.contact-form button {
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.contact-form button:hover {
  background-color: var(--accent);
}

.contact-info h3 {
  margin-bottom: 1rem;
  color: var(--dark);
}

.contact-info p, .contact-info li {
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 0.5rem;
}

.contact-info ul {
  list-style: none;
  padding-left: 0;
}

/* Blog / Resources */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.blog-card {
  background-color: #ffffff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: transform 0.2s ease;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-4px);
}

.blog-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.blog-card h4 {
  font-size: 1.1rem;
  margin: 0.75rem 1rem 0.5rem;
  color: var(--dark);
}

.blog-card p {
  font-size: 0.9rem;
  color: #555;
  margin: 0 1rem 1rem;
  flex-grow: 1;
}

.blog-card a {
  padding: 0.5rem 1rem 1rem;
  color: var(--primary);
  font-weight: 500;
}

/* Footer */
footer {
  background-color: #052E1D;
  color: #ffffff;
  padding: 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

footer h4 {
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  color: #ffffff;
}

footer a {
  color: #ffffff;
  font-size: 0.9rem;
  display: block;
  margin-bottom: 0.5rem;
  transition: opacity 0.2s ease;
}

footer a:hover {
  opacity: 0.8;
}

footer .newsletter {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

footer .newsletter input {
  padding: 0.5rem;
  border-radius: var(--radius);
  border: none;
  font-size: 0.9rem;
}

footer .newsletter button {
  padding: 0.5rem;
  border: none;
  border-radius: var(--radius);
  background-color: var(--primary);
  color: #ffffff;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

footer .newsletter button:hover {
  background-color: var(--accent);
}

.footer-bottom {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #cccccc;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .nav-links {
    gap: 0.5rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .metrics {
    flex-direction: column;
    align-items: center;
  }
}