/* ========================================
   Foundry of Zero - Main Stylesheet
   Dark theme with matrix green accents
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  /* Backgrounds */
  --bg-deep: #0a0a0a;
  --bg-surface: #111111;
  --bg-elevated: #1a1a1a;

  /* Text */
  --text-primary: #e0e0e0;
  --text-muted: #666666;

  /* Accents */
  --accent-matrix: #00ff41;
  --accent-copper: #b87333;
  --accent-amber: #d4a853;

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --container-max: 1100px;
  --container-pad: 1.5rem;

  /* Nav */
  --nav-height: 60px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-deep);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--accent-matrix);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: 1rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elevated);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

pre {
  background: var(--bg-surface);
  border: 1px solid var(--bg-elevated);
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background: none;
  padding: 0;
}

blockquote {
  border-left: 3px solid var(--accent-copper);
  padding-left: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px solid var(--bg-elevated);
  margin: 2rem 0;
}

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

/* --- Navigation --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bg-elevated);
  height: var(--nav-height);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent-matrix);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--accent-amber);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-github svg {
  fill: var(--text-muted);
  transition: fill 0.2s ease;
}

.nav-github:hover svg {
  fill: var(--text-primary);
}

/* Hamburger menu button (mobile only) */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Hamburger active state */
.nav-hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-surface);
  z-index: 999;
  padding: 2rem var(--container-pad);
}

.mobile-menu.open {
  display: block;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-nav-links a {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 500;
  font-family: var(--font-mono);
}

.mobile-nav-links a:hover,
.mobile-nav-links a.active {
  color: var(--accent-matrix);
}

/* --- Main Content --- */
#content {
  flex: 1;
  padding: 2.5rem 0;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--bg-elevated);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  text-align: center;
}

.footer-tagline {
  font-family: var(--font-mono);
  color: var(--accent-amber);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.footer-copyright a {
  color: var(--text-muted);
}

.footer-copyright a:hover {
  color: var(--accent-matrix);
}

.footer-credit {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.footer-credit a {
  color: var(--text-muted);
}

.footer-credit a:hover {
  color: var(--accent-matrix);
}

/* --- Utility Classes --- */
.text-muted {
  color: var(--text-muted);
}

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

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

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

.mono {
  font-family: var(--font-mono);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg-deep);
}

.matrix-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 4rem 0;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--accent-amber);
  margin-bottom: 2.5rem;
}

.cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent-matrix);
}

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

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 4px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-outline {
  color: var(--accent-matrix);
  border: 1px solid var(--accent-matrix);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(0, 255, 65, 0.1);
  color: var(--accent-matrix);
  box-shadow: 0 0 12px rgba(0, 255, 65, 0.15);
}

/* --- Home Sections --- */
.home-section {
  padding: 3.5rem 0;
}

.section-heading {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-prefix {
  color: var(--accent-copper);
  margin-right: 0.5rem;
}

.section-link {
  margin-top: 1.5rem;
  font-size: 0.9rem;
}

/* --- Card Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* --- Project Card --- */
.project-card {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: 8px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.project-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-matrix);
  box-shadow: 0 0 16px rgba(0, 255, 65, 0.08);
}

.project-card .card-link {
  display: block;
  padding: 1.25rem;
  color: var(--text-primary);
}

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

.card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.1rem;
  margin-bottom: 0;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-pill {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--accent-copper);
  border: 1px solid rgba(184, 115, 51, 0.3);
  border-radius: 12px;
}

.status-badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  border-radius: 3px;
  white-space: nowrap;
}

.status-active {
  color: var(--accent-matrix);
  border: 1px solid rgba(0, 255, 65, 0.3);
}

.status-experimental {
  color: var(--accent-amber);
  border: 1px solid rgba(212, 168, 83, 0.3);
}

.status-archived {
  color: var(--text-muted);
  border: 1px solid rgba(102, 102, 102, 0.3);
}

.card-github {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--text-muted);
  z-index: 3;
}

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

/* --- Post Card --- */
.post-card {
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: 8px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-matrix);
  box-shadow: 0 0 16px rgba(0, 255, 65, 0.08);
}

.post-card .card-link {
  display: block;
  padding: 1.25rem;
  color: var(--text-primary);
}

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

.post-date {
  font-size: 0.8rem;
  display: block;
  margin-bottom: 0.25rem;
}

.post-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.reading-time {
  font-size: 0.75rem;
  white-space: nowrap;
}

.post-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* --- Blog Prose --- */
.content {
  max-width: 70ch;
  line-height: 1.7;
}

.content h2 {
  margin-top: 2rem;
}

.content h3 {
  margin-top: 1.5rem;
}

.content ul,
.content ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.content ol {
  list-style: decimal;
}

.content li {
  margin-bottom: 0.25rem;
}

/* --- Project Detail --- */
.project-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-matrix);
  border: 1px solid var(--accent-matrix);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.github-link:hover {
  background: rgba(0, 255, 65, 0.1);
  color: var(--accent-matrix);
}

.back-link {
  display: inline-block;
  margin-top: 2.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.back-link:hover {
  color: var(--accent-matrix);
}

/* --- Tag Filter Row --- */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tag-filter a {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--accent-copper);
  border: 1px solid rgba(184, 115, 51, 0.3);
  border-radius: 14px;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.tag-filter a:hover {
  background: rgba(184, 115, 51, 0.1);
  color: var(--accent-copper);
}

/* --- Blog Post Meta Row --- */
.post-meta-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.post-meta-row time {
  color: var(--text-muted);
}

.post-meta-row .tag-pill {
  font-size: 0.7rem;
}

.blog-post .content {
  margin-bottom: 2rem;
}

/* --- 404 Page --- */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  text-align: center;
  padding: 2rem;
}

.page-404 .error-code {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 15vw, 10rem);
  font-weight: 700;
  color: var(--accent-matrix);
  line-height: 1;
  margin-bottom: 1rem;
}

.page-404 .error-message {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .card-grid,
  .post-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .card-grid,
  .post-list {
    grid-template-columns: 1fr;
  }

  .footer-container {
    padding: 0 1rem;
  }

  .post-meta-row {
    font-size: 0.8rem;
  }

  .project-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .tag-filter {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.5rem;
  }
}