/* Global styles and resets for the MEBYT marketing site. This file sets
   sensible defaults, establishes the base typography and colours, and
   provides utility classes for layout and responsiveness. */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-black);
  color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--spacing-2);
  color: var(--color-white);
}

p {
  margin-bottom: var(--spacing-2);
  max-width: 70ch;
}

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

/* Utility classes */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--spacing-2);
  padding-right: var(--spacing-2);
}

.section {
  padding-top: var(--spacing-6);
  padding-bottom: var(--spacing-6);
}

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

.grid {
  display: grid;
  gap: var(--spacing-3);
}

/* Grid helpers for different breakpoints */
.grid-cols-1 {
  grid-template-columns: 1fr;
}
.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-black);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-medium);
  font-weight: 600;
  transition: background-color 0.2s ease;
}
.btn:hover {
  background-color: var(--color-green);
  color: var(--color-black);
}
.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-white);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-medium);
  font-weight: 600;
  transition: background-color 0.2s ease;
}
.btn-secondary:hover {
  background-color: var(--color-gray);
}

/* Header & Navigation */
.header {
  background-color: var(--color-black);
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-2);
  padding-bottom: var(--spacing-2);
}
.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
}
.nav {
  position: relative;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  list-style: none;
}
.nav-links a {
  color: var(--color-white);
  font-weight: 500;
  padding: var(--spacing-1) var(--spacing-2);
  transition: color 0.2s ease;
}
.nav-links a:hover {
  color: var(--color-green);
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 24px;
  background: none;
  border: none;
  cursor: pointer;
}
.menu-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
}
@media (max-width: 768px) {
  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--color-black);
    flex-direction: column;
    width: 200px;
    padding: var(--spacing-2);
    display: none;
    box-shadow: var(--shadow-medium);
  }
  .nav.open .nav-links {
    display: flex;
  }
  .menu-toggle {
    display: flex;
  }
}

/* Footer */
.footer {
  background-color: var(--color-gray);
  padding: var(--spacing-4) 0;
  color: var(--color-white);
  font-size: 0.875rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-3);
}
.footer-left {
  flex: 1 1 200px;
}
.footer-left .logo {
  margin-bottom: var(--spacing-1);
  font-size: 1.25rem;
}
.footer-links {
  flex: 1 1 200px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}
.footer-links a {
  color: var(--color-white);
}
.footer-right {
  flex: 1 1 200px;
  text-align: right;
}
@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-right {
    text-align: left;
  }
}

/* Hero section */
.hero {
  background-color: var(--color-black);
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-3);
}
.hero p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-4);
  color: rgba(255,255,255,0.85);
}
@media (min-width: 768px) {
  .hero h1 {
    font-size: 3.5rem;
  }
  .hero p {
    font-size: 1.25rem;
  }
}

/* Engine cards */
.engine-overview h2 {
  text-align: center;
  margin-bottom: var(--spacing-4);
}
.engine-card {
  background-color: var(--color-gray);
  border-radius: var(--radius-medium);
  padding: var(--spacing-3);
  box-shadow: var(--shadow-small);
  transition: transform 0.2s ease;
}
.engine-card:hover {
  transform: translateY(-4px);
}
.engine-card h3 {
  margin-bottom: var(--spacing-1);
  font-size: 1.25rem;
  color: var(--color-primary);
}
.engine-card p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
}

/* Case study tiles */
.case-study-grid {
  display: grid;
  gap: var(--spacing-3);
}
.case-card {
  background-color: var(--color-gray);
  border-radius: var(--radius-medium);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-small);
  transition: transform 0.2s ease;
}
.case-card:hover {
  transform: translateY(-4px);
}
.case-card .card-content {
  padding: var(--spacing-3);
}
.case-card h3 {
  margin-bottom: var(--spacing-1);
  font-size: 1.25rem;
  color: var(--color-primary);
}
.case-card p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
}

/* Blog index cards */
.blog-grid {
  display: grid;
  gap: var(--spacing-3);
}
.blog-card {
  background-color: var(--color-gray);
  border-radius: var(--radius-medium);
  padding: var(--spacing-3);
  box-shadow: var(--shadow-small);
  transition: transform 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.blog-card:hover {
  transform: translateY(-4px);
}
.blog-card h3 {
  margin-bottom: var(--spacing-2);
  color: var(--color-primary);
  font-size: 1.25rem;
}
.blog-card p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--spacing-2);
}
.blog-card .tags {
  font-size: 0.75rem;
  color: var(--color-green);
}

/* Blog filters */
.blog-filters {
  margin-bottom: var(--spacing-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-1);
}
.filter-button {
  padding: var(--spacing-1) var(--spacing-2);
  border: 1px solid var(--color-white);
  border-radius: var(--radius-small);
  font-size: 0.875rem;
  cursor: pointer;
  background: transparent;
  color: var(--color-white);
  transition: background-color 0.2s ease;
}
.filter-button.active,
.filter-button:hover {
  background-color: var(--color-primary);
  color: var(--color-black);
}

/* Accordion */
.accordion {
  border-top: 1px solid rgba(255,255,255,0.1);
}
.accordion-item {
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.accordion-button {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--color-white);
  padding: var(--spacing-2) 0;
  font-size: 1rem;
  position: relative;
  cursor: pointer;
}
.accordion-button::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
}
.accordion-button.active::after {
  content: '–';
}
.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
}
.accordion-content p {
  padding-bottom: var(--spacing-2);
}

/* Form styles */
form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  max-width: 600px;
  margin-top: var(--spacing-3);
}
label {
  font-weight: 600;
  margin-bottom: 0.25rem;
}
input[type="text"],
input[type="email"],
input[type="number"],
textarea,
select {
  background-color: var(--color-gray);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-small);
  padding: var(--spacing-2);
  color: var(--color-white);
}
input::placeholder,
textarea::placeholder {
  color: rgba(255,255,255,0.5);
}
button[type="submit"] {
  align-self: flex-start;
}

/* Utility margins */
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }

/* 404 page */
.error-page {
  text-align: center;
  padding: var(--spacing-5) 0;
}
.error-page h1 {
  font-size: 4rem;
  margin-bottom: var(--spacing-2);
}
.error-page p {
  font-size: 1.125rem;
}