/* ============================================
   Lunar Staircase - Main Stylesheet
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-bg-primary: #0a1628;
  --color-bg-secondary: #132238;
  --color-accent-warm: #f4b942;
  --color-accent-cool: #4ecdc4;
  --color-text-primary: #ffffff;
  --color-text-secondary: #94a3b8;
  --color-text-accent: #4ecdc4;
  
  /* Typography */
  --font-family: 'Poppins', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3rem;
  --spacing-xl: 6rem;
  
  /* Layout */
  --max-width: 1200px;
  --border-radius: 1rem;
  --border-radius-sm: 0.5rem;
  
  /* Transitions */
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

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

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

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

ul {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

.text-secondary {
  color: var(--color-text-secondary);
}

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

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* ---------- Skip Link (Accessibility) ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-accent-warm);
  color: var(--color-bg-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
}

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
  text-decoration: none;
}

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

.logo__icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
  display: none; /* Hidden until individual logo files are extracted */
}

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

.logo__image {
  height: 40px;
  width: auto;
}

/* Navigation */
.nav {
  display: none;
}

.nav--open {
  display: flex;
}

.nav__list {
  display: flex;
  gap: var(--spacing-lg);
}

.nav__link {
  color: var(--color-text-primary);
  font-weight: 500;
  position: relative;
  padding: var(--spacing-xs) 0;
}

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

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

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

/* Mobile Menu Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle__bar {
  width: 100%;
  height: 3px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.hero__content {
  max-width: 800px;
}

.hero__logo {
  width: auto;
  height: auto;
  max-width: 280px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--border-radius);
}

.hero__title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.hero__title span {
  color: var(--color-accent-cool);
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

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

.btn--primary:hover {
  background-color: #e5a93d;
  color: var(--color-bg-primary);
  transform: translateY(-2px);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-text-accent);
  border: 2px solid var(--color-text-accent);
}

.btn--secondary:hover {
  background-color: var(--color-text-accent);
  color: var(--color-bg-primary);
}

/* ---------- About Section ---------- */
.about {
  background-color: var(--color-bg-secondary);
}

.about__content {
  display: grid;
  gap: var(--spacing-lg);
  align-items: center;
}

.about__text h2 {
  margin-bottom: var(--spacing-sm);
}

.about__text p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.about__text p:last-of-type {
  margin-bottom: 0;
}

/* ---------- Services Section ---------- */
.services__header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.services__header h2 {
  margin-bottom: var(--spacing-xs);
}

.services__header p {
  color: var(--color-text-secondary);
}

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

.service-card {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  transition: transform var(--transition);
}

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

.service-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.service-card h3 {
  margin-bottom: var(--spacing-xs);
}

.service-card p {
  color: var(--color-text-secondary);
}

/* ---------- Featured Projects Section ---------- */
.featured__header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.featured__header h2 {
  margin-bottom: var(--spacing-xs);
}

.featured__header p {
  color: var(--color-text-secondary);
}

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

.featured__cta {
  text-align: center;
  margin-top: var(--spacing-lg);
}

/* ---------- Project Cards ---------- */
.project-card {
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: transform var(--transition);
}

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

.project-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-bg-primary);
}

.project-card__content {
  padding: var(--spacing-md);
}

.project-card h3 {
  margin-bottom: var(--spacing-xs);
}

.project-card p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.tag {
  background-color: rgba(78, 205, 196, 0.1);
  color: var(--color-text-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.875rem;
}

.project-card__link {
  font-weight: 500;
}

/* ---------- CTA Section ---------- */
.cta {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  text-align: center;
}

.cta h2 {
  margin-bottom: var(--spacing-sm);
}

.cta p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Page Header ---------- */
.page-header {
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.page-header h1 {
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Projects Page ---------- */
.projects-grid {
  display: grid;
  gap: var(--spacing-md);
}

/* ---------- Contact Page ---------- */
.contact__content {
  display: grid;
  gap: var(--spacing-lg);
}

.contact__info h2 {
  margin-bottom: var(--spacing-sm);
}

.contact__info p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.contact__email {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-accent-warm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition);
}

.contact__email:hover {
  background-color: var(--color-accent-warm);
  color: var(--color-bg-primary);
}

.contact__email svg {
  width: 24px;
  height: 24px;
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-lg) var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  text-align: center;
}

.footer__logo {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: none; /* Hidden until individual logo files are extracted */
}

.footer__logo-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text-primary);
}

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

.footer__copyright {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer__links {
  display: flex;
  gap: var(--spacing-md);
}

.footer__links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

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

/* ---------- Placeholder Image ---------- */
.placeholder-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, rgba(78, 205, 196, 0.2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* ---------- Responsive ---------- */

/* Tablet */
@media (min-width: 640px) {
  .nav {
    display: flex;
  }
  
  .nav-toggle {
    display: none;
  }
  
  .hero__title {
    font-size: 3rem;
  }
  
  .hero__logo {
    max-width: 320px;
  }
  
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .featured__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about__content {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact__content {
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  h1 {
    font-size: 3.5rem;
  }
  
  .hero__title {
    font-size: 3.5rem;
  }
  
  .services__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .featured__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile Nav Overlay */
@media (max-width: 639px) {
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(10, 22, 40, 0.98);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 99;
  }
  
  .nav__list {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
  }
  
  .nav__link {
    font-size: 1.5rem;
  }
}

/* ---------- Focus States (Accessibility) ---------- */
a:focus,
button:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--color-accent-cool);
  outline-offset: 2px;
}

/* ---------- Utility Classes ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}