/* ─── Reset & base ─────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-void:        #020408;
  --bg-dark:        #080d14;
  --bg-surface:     #0d1520;

  /* Accent — unified cold blue (ship-console feel) */
  --accent:         #38bdf8;
  --accent-glow:    rgba(56, 189, 248, 0.25);
  --accent-dim:     rgba(56, 189, 248, 0.12);
  --accent-gradient: linear-gradient(135deg, #38bdf8, #818cf8);

  /* Text */
  --text-primary:   #e2eaf4;
  --text-secondary: #7a92ad;
  --text-muted:     #3a4f62;

  /* Glass */
  --glass-bg:       rgba(8, 20, 35, 0.65);
  --glass-border:   rgba(56, 189, 248, 0.12);
  --glass-blur:     blur(16px);

  /* Typography */
  --font-display:   'Archivo', system-ui, sans-serif;
  --font-body:      'Space Grotesk', system-ui, sans-serif;
  --font-mono:      'Share Tech Mono', 'Courier New', monospace;

  /* Spacing scale */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   2rem;
  --space-xl:   4rem;
  --space-2xl:  8rem;

  /* Transitions */
  --transition-fast:  all 0.15s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition:       all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-slow:  all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);

  /* Category accent override — set per category page */
  --cat-accent: var(--accent);

  /* Legacy compat */
  --nav-backdrop-blur: var(--glass-blur);
}

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

html, body {
  min-height: 100%;
  scroll-behavior: smooth;
  background-color: var(--bg-void);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Typography & Effects ────────────────────────────────────────── */
h1, h2 {
  font-family: var(--font-display);
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

/* ─── Modal / Lightbox Base ─────────────────────────────────────── */
.modal, .lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(2, 4, 8, 0.85);
  backdrop-filter: blur(15px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  display: flex !important;
  align-items: center;
  justify-content: center;
}

.modal.active, .lightbox.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--bg-surface);
  padding: 2.5rem;
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
  z-index: 10000;
  box-shadow: 0 25px 50px rgba(0,0,0,0.5);
  margin: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

/* ─── Navigation ────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition);
}

nav.scrolled {
  padding: 1rem 3rem;
  background: rgba(2, 8, 18, 0.9);
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

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

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

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

/* ─── Hamburger Menu ─────────────────────────────────────────────── */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-secondary);
  flex-direction: column;
  gap: 5px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: var(--transition);
}

@media (max-width: 768px) {
  nav {
    padding: 1.25rem 1.5rem;
  }

  .nav-links {
    display: none;
  }

  .nav-links.nav-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    gap: 1rem;
  }

  .nav-hamburger {
    display: flex;
  }
}

/* ─── Hero section ──────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 4rem;
}

.hero-content {
  max-width: 1000px;
  z-index: 10;
}

.brand {
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 2.5rem;
  text-wrap: balance;
}

/* ─── Tags & Badges ─────────────────────────────────────────────── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag {
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(56, 189, 248, 0.04);
  backdrop-filter: blur(4px);
  cursor: pointer;
  transition: var(--transition);
}

.tag:hover {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ─── Scroll indicator ──────────────────────────────────────────── */
.scroll-hint {
  position: absolute;
  bottom: 3rem;
  left: 4rem;
  color: var(--text-secondary);
  animation: bounce 2s infinite;
  opacity: 0.7;
  transition: var(--transition);
}

.scroll-hint:hover {
  color: var(--text-primary);
  opacity: 1;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

/* ─── Projects section ──────────────────────────────────────────── */
#projects {
  max-width: 1400px;
  margin: 0 auto;
  padding: 8rem 4rem;
}

.projects-header {
  margin-bottom: 5rem;
}

.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 0 6px var(--accent-glow);
  margin-bottom: 1rem;
}

#projects h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

/* ─── Project grid ──────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 4rem 3rem;
}

/* ─── Individual card ───────────────────────────────────────────── */
.project-card {
  cursor: pointer;
  group: true;
}

.project-image {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 1rem;
  overflow: hidden;
  margin-bottom: 1.5rem;
  background: var(--card-color, var(--bg-dark));
  border: 1px solid var(--glass-border);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  transition: var(--transition);
}

.project-card:hover .project-image {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px -10px rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.25);
}

.glass-panel {
  position: absolute;
  inset: 0;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 1rem;
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.project-number {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 3rem;
  font-weight: 900;
  color: rgba(56, 189, 248, 0.12);
  letter-spacing: -0.05em;
  transition: var(--transition);
}

.project-card:hover .project-number {
  color: rgba(56, 189, 248, 0.3);
  transform: translateX(5px);
}

.project-info {
  padding: 0 0.5rem;
}

.project-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.project-year {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.project-tags {
  display: flex;
  gap: 0.5rem;
}

.project-tags .tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: rgba(56, 189, 248, 0.04);
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  transition: var(--transition);
}

.project-card:hover .project-title {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.project-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition);
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(56, 189, 248, 0.2);
}

.project-link .arrow {
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.project-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.project-link:hover .arrow {
  transform: translateX(4px);
}

/* ─── Animations ────────────────────────────────────────────────── */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
  animation-delay: var(--delay, 0s);
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ─── prefers-reduced-motion guard ──────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .fade-in-up,
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
    transition: none;
  }

  @keyframes bounce {
    0%, 100% { transform: translateY(0); }
  }
}

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero {
    padding: 0 2rem;
  }

  #projects {
    padding: 6rem 2rem;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 0 1.5rem;
  }

  .scroll-hint {
    left: 1.5rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  #projects {
    padding: 5rem 1.5rem;
  }
}