/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  --color-bg:        #0a0a0a;
  --color-surface:   #111111;
  --color-surface-2: #1a1a1a;
  --color-border:    #222222;
  --color-text:      #e8e8e8;
  --color-muted:     #888888;
  --color-accent:    #4f7fff;
  --color-accent-2:  #a855f7;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;

  --shadow-card:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 8px 40px rgba(79, 127, 255, 0.15);

  --transition:      0.2s ease;
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1280px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
}

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

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

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

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(3rem, 8vw, 6rem); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: opacity var(--transition);
}
.site-logo:hover { opacity: 0.75; }
.site-logo span { color: var(--color-accent); }

.site-nav { display: flex; align-items: center; gap: 0.25rem; }

.site-nav a {
  padding: 0.4rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-block: clamp(4rem, 10vw, 8rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(79, 127, 255, 0.12), transparent);
  pointer-events: none;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero-title .gradient {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-muted);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-stats {
  display: inline-flex;
  gap: clamp(1.5rem, 4vw, 3rem);
  flex-wrap: wrap;
  justify-content: center;
}

.hero-stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================================
   FILTER BAR
   ============================================================ */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-bar-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.5rem;
}

.filter-btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: all var(--transition);
}

.filter-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-btn.active { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

/* ============================================================
   PROJECT GRID
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

/* ============================================================
   PROJECT CARD
   ============================================================ */
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(79, 127, 255, 0.3);
}

.project-card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface-2);
}

.project-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card-thumb img { transform: scale(1.04); }

.project-card-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-border);
  background: linear-gradient(135deg, var(--color-surface-2), var(--color-surface));
}

.project-card-thumb-placeholder svg {
  width: 40px;
  height: 40px;
  opacity: 0.4;
}

.project-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card:hover .project-card-overlay { opacity: 1; }

.project-card-overlay-btn {
  padding: 0.6rem 1.4rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition);
}
.project-card-overlay-btn:hover { transform: scale(1.05); }

.project-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.project-tag {
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--color-surface-2);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.project-tag.featured {
  background: rgba(79, 127, 255, 0.15);
  color: var(--color-accent);
  border-color: rgba(79, 127, 255, 0.3);
}

.project-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  transition: color var(--transition);
}
.project-card:hover .project-card-title { color: #fff; }

.project-card-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.project-card-meta { font-size: 0.75rem; color: var(--color-muted); }

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

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  transition: all var(--transition);
}

.project-link-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(79, 127, 255, 0.05);
}

.project-link-btn svg { width: 12px; height: 12px; flex-shrink: 0; }

/* ============================================================
   SINGLE PROJECT
   ============================================================ */
.project-single { padding-block: clamp(3rem, 8vw, 5rem); }

.project-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 2.5rem;
  transition: color var(--transition);
}
.project-back:hover { color: var(--color-text); }
.project-back svg { width: 16px; height: 16px; }

.project-single-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.project-single-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.project-single-desc {
  font-size: 1.1rem;
  color: var(--color-muted);
  line-height: 1.7;
  max-width: 640px;
}

.project-single-actions { display: flex; flex-direction: column; gap: 0.75rem; min-width: 160px; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity var(--transition);
}
.btn-primary:hover { opacity: 0.85; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: border-color var(--transition), background var(--transition);
}
.btn-secondary:hover { border-color: var(--color-accent); background: rgba(79, 127, 255, 0.05); }

.project-single-screenshot {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-bottom: 3rem;
  box-shadow: var(--shadow-card);
}

.project-single-content {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.project-single-body { color: var(--color-muted); line-height: 1.8; }
.project-single-body p { margin-bottom: 1rem; }

.project-meta-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: sticky;
  top: 80px;
}

.project-meta-item { margin-bottom: 1.25rem; }
.project-meta-item:last-child { margin-bottom: 0; }

.project-meta-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 0.35rem;
}

.project-meta-value { font-size: 0.9rem; font-weight: 500; color: var(--color-text); }
.project-meta-value a { color: var(--color-accent); word-break: break-all; }
.project-meta-value a:hover { text-decoration: underline; }

.tech-pill-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tech-pill {
  padding: 0.25rem 0.65rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-muted);
}

/* ============================================================
   SKELETON LOADER
   ============================================================ */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-2) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.skeleton-thumb { aspect-ratio: 16/9; }
.skeleton-body  { padding: 1.25rem 1.5rem 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.skeleton-line  { height: 14px; }
.skeleton-line.short { width: 60%; }
.skeleton-line.tall  { height: 18px; }

/* ============================================================
   EMPTY / ERROR STATE
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 5rem 1rem;
  grid-column: 1 / -1;
}
.empty-state-icon { font-size: 2.5rem; margin-bottom: 1rem; opacity: 0.3; }
.empty-state-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.empty-state-desc  { color: var(--color-muted); font-size: 0.9rem; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
  margin-top: 4rem;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy { font-size: 0.8rem; color: var(--color-muted); }
.footer-copy a { color: var(--color-accent); }
.footer-copy a:hover { opacity: 0.75; }

.footer-links { display: flex; gap: 1.25rem; }
.footer-links a { font-size: 0.8rem; color: var(--color-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--color-text); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .project-single-header { grid-template-columns: 1fr; }
  .project-single-actions { flex-direction: row; min-width: 0; }
  .project-single-content { grid-template-columns: 1fr; }
  .project-meta-card { position: static; }
}

@media (max-width: 640px) {
  .projects-grid { grid-template-columns: 1fr; }
  .site-nav { display: none; }
  .hero-stats { gap: 1.5rem; }
}