/* ===================================================================
   STUDIO REACTIVE - Architecture Firm Inspired Design
   Inspired by BIG, Zaha Hadid Architects, Heatherwick Studio
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ===================================================================
   CSS CUSTOM PROPERTIES
   =================================================================== */
:root {
  /* Dark Theme Palette */
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1a1a1a;
  --bg-card: #111111;
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-tertiary: rgba(255, 255, 255, 0.5);
  --text-muted: rgba(255, 255, 255, 0.35);
  
  /* Accent */
  --accent: #ffffff;
  --accent-hover: rgba(255, 255, 255, 0.8);
  
  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  
  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;
  
  /* Container */
  --container-max: 1600px;
  --container-padding: 3rem;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

a {
  color: inherit;
  text-decoration: none;
}

/* ===================================================================
   HEADER & NAVIGATION
   =================================================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(to bottom, var(--bg-primary), transparent);
  transition: background var(--transition-medium);
}

header.scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.7;
}

.tagline {
  display: none;
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

nav a {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width var(--transition-medium);
}

nav a:hover,
nav a.active {
  color: var(--text-primary);
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

/* ===================================================================
   MAIN CONTENT
   =================================================================== */
main {
  min-height: 100vh;
  padding-top: 120px;
}

/* ===================================================================
   PORTFOLIO GRID - Homepage
   =================================================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border-subtle);
  padding: 0 var(--container-padding);
}

.project-card {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-secondary);
  display: block;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), filter var(--transition-medium);
  filter: grayscale(30%) brightness(0.9);
}

.project-card:hover .project-image {
  transform: scale(1.05);
  filter: grayscale(0%) brightness(1);
}

.project-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg) var(--space-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-primary);
  transform: translateY(100%);
  opacity: 0;
  transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.project-card:hover .project-title {
  transform: translateY(0);
  opacity: 1;
}

/* Project Number Overlay */
.project-card::before {
  content: attr(data-number);
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  z-index: 2;
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.project-card:hover::before {
  opacity: 1;
}

/* ===================================================================
   PROJECT DETAIL PAGE
   =================================================================== */
.project-detail {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding) var(--space-2xl);
}

.project-detail-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
  border-left: none;
  padding-left: 0;
}

.project-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.detail-image {
  width: 100%;
  height: auto;
  border: none;
  transition: filter var(--transition-medium);
}

.detail-image:hover {
  filter: brightness(1.1);
}

/* Single large image */
.project-gallery .detail-image:first-child:last-child {
  grid-column: 1 / -1;
}

.project-description {
  max-width: 800px;
  margin: var(--space-xl) 0;
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--text-secondary);
  font-weight: 300;
  background: transparent;
  border-left: none;
  padding: 0;
}

.project-navigation {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-start;
}

.project-navigation a {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
  background: transparent;
}

.project-navigation a:hover {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
  background: transparent;
}

/* ===================================================================
   ABOUT PAGE
   =================================================================== */
.about-page,
.contact-page {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-lg) var(--container-padding) var(--space-2xl);
}

.about-page h2,
.contact-page h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
  text-transform: none;
}

.about-page p {
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-weight: 300;
}

.about-page section {
  margin-bottom: var(--space-xl);
}

/* Core Services List */
.core-services-list {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}

.core-services-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
  transition: color var(--transition-fast);
}

.core-services-list li:hover {
  color: var(--text-primary);
}

.core-services-list li:last-child {
  border-bottom: none;
}

/* CV Link */
.cv-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
  margin-top: var(--space-md);
  border-bottom: 1px solid var(--border-medium);
  transition: all var(--transition-fast);
}

.cv-link:hover {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
}

/* Experience Items */
.experience-item {
  margin-bottom: var(--space-lg);
  border-left: none;
  padding-left: 0;
}

.experience-item h3 {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.1rem;
  text-transform: none;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  letter-spacing: 0;
}

/* ===================================================================
   CONTACT PAGE
   =================================================================== */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.contact-form label {
  font-family: var(--font-heading);
  font-weight: 400;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: var(--space-xs);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--border-medium);
  background: transparent;
  padding: var(--space-sm) 0;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-bottom-color: var(--text-primary);
  outline: none;
}

.contact-form textarea {
  min-height: 150px;
  resize: vertical;
}

.submit-btn {
  align-self: flex-start;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bg-primary);
  background: var(--text-primary);
  border: none;
  padding: var(--space-sm) var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.submit-btn:hover {
  background: var(--text-secondary);
}

/* ===================================================================
   FOOTER
   =================================================================== */
footer {
  padding: var(--space-xl) var(--container-padding);
  text-align: center;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  margin-top: var(--space-2xl);
  background: transparent;
}

/* ===================================================================
   RESPONSIVE DESIGN
   =================================================================== */
@media (max-width: 1200px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1.5rem;
  }
  
  header {
    padding: var(--space-sm) var(--container-padding);
  }
  
  .logo {
    font-size: 1rem;
  }
  
  nav ul {
    gap: var(--space-md);
  }
  
  nav a {
    font-size: 0.65rem;
  }
  
  main {
    padding-top: 80px;
  }
  
  .portfolio-grid {
    grid-template-columns: 1fr;
    padding: 0;
  }
  
  .project-card {
    aspect-ratio: 16 / 9;
  }
  
  .project-title {
    transform: translateY(0);
    opacity: 1;
    padding: var(--space-md);
    font-size: 0.875rem;
  }
  
  .project-detail-title {
    font-size: 2rem;
  }
  
  .project-gallery {
    grid-template-columns: 1fr;
  }
  
  .about-page,
  .contact-page {
    padding: var(--space-md) var(--container-padding) var(--space-xl);
  }
}

@media (max-width: 480px) {
  nav ul {
    gap: var(--space-sm);
  }
  
  .logo {
    font-size: 0.875rem;
    letter-spacing: 0.1em;
  }
}

/* ===================================================================
   ANIMATIONS
   =================================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-card {
  animation: fadeInUp 0.6s ease-out backwards;
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.15s; }
.project-card:nth-child(3) { animation-delay: 0.2s; }
.project-card:nth-child(4) { animation-delay: 0.25s; }
.project-card:nth-child(5) { animation-delay: 0.3s; }
.project-card:nth-child(6) { animation-delay: 0.35s; }
.project-card:nth-child(7) { animation-delay: 0.4s; }
.project-card:nth-child(8) { animation-delay: 0.45s; }
.project-card:nth-child(9) { animation-delay: 0.5s; }

/* Page load animation */
main {
  animation: fadeInUp 0.8s ease-out;
}