@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* CSS Custom Properties / Design System */
:root {
  --primary: #247BA0;
  --primary-hover: #1b5d7a;
  --primary-light: #eef7fc;
  --primary-rgb: 36, 123, 160;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  
  --bg-main: #ffffff;
  --bg-sub: #f8fafc;
  --bg-card: #ffffff;
  
  --border: #cbd5e1;
  --border-hover: #94a3b8;
  --border-focus: #93c5fd;
  
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(36, 123, 160, 0.08), 0 8px 10px -6px rgba(36, 123, 160, 0.08);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1200px;
}

/* Global resets & Base styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

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

/* Utility Layout Classes */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #e2e8f0;
  transition: var(--transition);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  position: relative;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 101;
}

.logo-img, .footer-logo-img {
  width: 38px;
  height: 38px;
  object-fit: cover;
  background-color: var(--primary-light);
  border-radius: 50%;
  overflow: hidden;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--primary);
  white-space: nowrap;
}

/* Hamburger toggle styling */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 0.5rem;
  z-index: 101;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.menu-toggle:hover {
  background-color: var(--bg-sub);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Desktop default nav menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

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

.btn-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary);
  color: var(--bg-main) !important;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 10px rgba(36, 123, 160, 0.2);
}

.btn-nav-cta:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

/* Mobile responsive menu */
@media (max-width: 767px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--bg-main);
    border-bottom: 1px solid #e2e8f0;
    padding: 1.5rem 2rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-md);
    align-items: stretch;
    text-align: center;
    z-index: 100;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-menu .nav-link {
    padding: 0.5rem 0;
    font-size: 1.05rem;
    border-bottom: 1px solid #f1f5f9;
  }
  
  .nav-menu .btn-nav-cta {
    width: 100%;
    padding: 0.75rem;
    margin-top: 0.5rem;
  }
}

/* Hero Section */
.hero-section {
  padding-top: 4rem;
  padding-bottom: 4.5rem;
  background: radial-gradient(circle at 80% 20%, rgba(36, 123, 160, 0.05) 0%, transparent 60%);
  overflow: hidden;
  text-align: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--primary-light);
  color: var(--primary);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero-badge svg {
  width: 14px;
  height: 14px;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

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

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 600px;
}

/* Courses Section */
.courses-section {
  padding: 4rem 0 6rem 0;
  background-color: var(--bg-sub);
  border-top: 1px solid #e2e8f0;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.courses-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Course Card base styling */
.course-card {
  background-color: var(--bg-card);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.course-card-top {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.course-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background-color: var(--card-accent-light);
  color: var(--card-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.course-icon-wrapper svg,
.course-icon-wrapper i {
  width: 32px;
  height: 32px;
  fill: currentColor;
  font-size: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  background-color: var(--card-accent-light);
  color: var(--card-accent-dark);
}

.course-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.course-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.btn-card {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-sub);
  color: var(--text-main);
  border: 1px solid #e2e8f0;
  transition: var(--transition);
  cursor: pointer;
  width: 100%;
}

.btn-card svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2.5;
  transition: var(--transition);
}

/* Card Hover States */
.course-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  border-color: var(--card-accent);
}

.course-card:hover .course-icon-wrapper {
  transform: scale(1.05);
}

.course-card:hover .btn-card {
  background-color: var(--card-accent);
  color: #ffffff;
  border-color: var(--card-accent);
}

.course-card:hover .btn-card svg {
  transform: translateX(3px);
}

/* Card Brand Color Overrides */
/* Docker: Primary Blue */
.course-card.docker {
  --card-accent: #2560ff;
  --card-accent-light: #ebf0ff;
  --card-accent-dark: #1044db;
}

/* Git: Green #80c783 */
.course-card.git {
  --card-accent: #80c783;
  --card-accent-light: #f0faf1;
  --card-accent-dark: #3b873e;
}

/* PHP: Blue/gray #c9daf6 */
.course-card.php {
  --card-accent: #c9daf6;
  --card-accent-light: #f4f8fe;
  --card-accent-dark: #476690;
}

/* Footer styling */
footer {
  background-color: var(--bg-main);
  border-top: 1px solid #e2e8f0;
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-about {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-about-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-about-title {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.footer-about-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 340px;
}

.footer-credits {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-credits-title {
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  color: var(--text-light);
  letter-spacing: 0.05em;
}

.footer-credits-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.footer-credits-text a {
  color: var(--text-main);
  font-weight: 600;
  border-bottom: 1.5px solid #cbd5e1;
}

.footer-credits-text a:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  border-top: 1px solid #e2e8f0;
  padding-top: 2rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-light);
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light);
}

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

/* Media Queries for Desktop Grid Layouts & Responsiveness */
@media (max-width: 767px) {
  .hero-ctas .btn {
    width: 100%;
  }
}

@media (min-width: 768px) {
  .hero-section {
    padding-top: 6rem;
    padding-bottom: 6.5rem;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
  
  .section-title {
    font-size: 2.5rem;
  }
  
  .courses-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 6rem;
  }
  
  .footer-bottom {
    flex-direction: row;
  }
}

@media (min-width: 992px) {
  .courses-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
  }
}