:root {
  --bg: #014f68;
  --fg: #ffffff;
  --muted: #9ca3af;
  --accent: #22d3ee;
  --warn: #ff5b1f;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  overflow-x: hidden;
  --grid-thin: rgba(255,255,255,0.06);
  --grid-thick: rgba(255,255,255,0.12);
  background-image:
    linear-gradient(to right, var(--grid-thin) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-thin) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-thick) 2px, transparent 2px),
    linear-gradient(to bottom, var(--grid-thick) 2px, transparent 2px);
  background-size: 80px 80px, 80px 80px, 400px 400px, 400px 400px;
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }
code { font-family: 'JetBrains Mono', 'Courier New', monospace; font-size: 0.85em; }

/* ===== Header ===== */
header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
}
.logo {
  font-weight: 800;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo img {
  width: 28px;
  height: 28px;
  display: block;
}
nav a {
  margin-left: 32px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 1px;
}
nav a:hover { color: var(--fg); }

/* ===== Page intro ===== */
.page-intro {
  padding: 180px 40px 80px;
  max-width: 1100px;
  margin: 0 auto;
}

.back-link {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--muted);
  margin-bottom: 32px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s, color .2s;
}
.back-link:hover { color: var(--fg); border-bottom-color: var(--fg); }

.project-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.project-meta span {
  font-size: 11px;
  letter-spacing: 2px;
  padding: 5px 12px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
}

.page-intro h1 {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 900;
  line-height: 0.95;
  margin-bottom: 12px;
}
.page-intro h1 .subtitle {
  display: inline-block;
  font-size: clamp(18px, 2.5vw, 32px);
  font-weight: 400;
  color: var(--muted);
  margin-top: 12px;
}

.page-intro p {
  margin: 32px 0;
  max-width: 760px;
  font-size: 18px;
  color: var(--muted);
  border-left: 3px solid var(--fg);
  padding-left: 20px;
}

/* ===== CTA buttons ===== */
.cta-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.cta-btn {
  display: inline-block;
  padding: 14px 28px;
  border: 1px solid #ffffff;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 2px;
  font-weight: 600;
  transition: background .2s, color .2s, transform .2s;
}
.cta-btn:hover {
  background: var(--fg);
  color: var(--bg);
  transform: translateY(-2px);
}
.cta-btn.primary {
  background: var(--fg);
  color: var(--bg);
}
.cta-btn.primary:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }

/* ===== Section block ===== */
.block {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 40px;
}

.title-label {
  font-size: 28px;
  letter-spacing: 4px;
  font-weight: 800;
  color: var(--fg);
  margin-bottom: 48px;
  padding-bottom: 16px;
  border-bottom: 2px solid rgba(255,255,255,0.15);
}

/* ===== Screenshots grid ===== */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.screenshot-card {
  display: block;
  border: 1px solid #ffffff;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(0,0,0,0.35);
  transition: transform .25s ease, box-shadow .25s ease;
  cursor: zoom-in;
}
.screenshot-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 0 3px #22d3ee33;
}
.screenshot-card img {
  width: 100%;
  display: block;
}

/* nuCrepes uses phone-shaped screenshots, so 3 per row works better */
.nucrepes-grid {
  grid-template-columns: repeat(3, 1fr);
}
.nucrepes-grid .screenshot-card {
  background: transparent;
  border: none;
  text-align: center;
}
.nucrepes-grid .screenshot-card img {
  max-height: 600px;
  width: auto;
  margin: 0 auto;
  border-radius: 28px;
}
.nucrepes-grid .screenshot-caption {
  border-top: none;
  padding-top: 14px;
  text-align: center;
}
.screenshot-caption {
  padding: 12px 20px;
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--muted);
  border-top: 1px solid rgba(255,255,255,0.1);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 40px;
}
.lightbox:target { display: flex; }
.lightbox img {
  max-width: 100%;
  max-height: 90vh;
  border-radius: 12px;
}

/* ===== Features ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature {
  padding: 28px;
  border-radius: 16px;
  border: 1px solid #ffffff;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(6px);
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}
.feature h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
}

/* ===== Architecture diagram ===== */
.arch-diagram {
  padding: 40px 20px;
  background: rgba(0,0,0,0.35);
  border: 1px solid #ffffff;
  border-radius: 20px;
  margin-bottom: 24px;
}

.arch-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 12px;
}
.arch-row-3 { gap: 16px; }
.arch-row-3 .arch-node { flex: 1; min-width: 0; }

.arch-arrow {
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  margin: 12px 0;
  letter-spacing: 2px;
}

.arch-node {
  padding: 20px 28px;
  border: 1px solid #ffffff;
  border-radius: 14px;
  text-align: center;
  background: rgba(255,255,255,0.04);
  min-width: 220px;
}
.arch-node.client { border-color: var(--accent); }
.arch-node.server { border-color: var(--fg); }
.arch-node.db,
.arch-node.ai,
.arch-node.files { border-color: var(--muted); }

.arch-node-label {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--muted);
  margin-bottom: 8px;
}
.arch-node-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}
.arch-node-desc {
  font-size: 13px;
  color: var(--muted);
}

.arch-note {
  margin-top: 24px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 880px;
}

/* ===== Tech stack ===== */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.stack-card {
  padding: 28px;
  border-radius: 16px;
  border: 1px solid #ffffff;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(6px);
}
.stack-card h3 {
  font-size: 16px;
  letter-spacing: 3px;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--accent);
}
.stack-card ul { list-style: none; }
.stack-card li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.stack-card li:last-child { border-bottom: none; }
.stack-card li span { color: var(--fg); }
.stack-card li code {
  color: var(--muted);
  background: rgba(0,0,0,0.4);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
}

/* ===== API endpoints ===== */
.api-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.api-group {
  border-radius: 16px;
  border: 1px solid #ffffff;
  background: rgba(0,0,0,0.45);
  overflow: hidden;
}
.api-group h3 {
  font-size: 14px;
  letter-spacing: 3px;
  font-weight: 800;
  padding: 16px 24px;
  background: rgba(0,0,0,0.4);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  color: var(--accent);
}
.api-group pre {
  padding: 20px 24px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg);
}
.api-group code {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  white-space: pre;
}

/* ===== Roles table ===== */
.roles-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid #ffffff;
  border-radius: 16px;
  overflow: hidden;
}
.roles-table th,
.roles-table td {
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.roles-table th {
  background: rgba(0,0,0,0.4);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--accent);
}
.roles-table tr:last-child td { border-bottom: none; }
.roles-table code {
  background: rgba(0,0,0,0.4);
  padding: 4px 10px;
  border-radius: 6px;
  color: var(--accent);
}

/* ===== Challenges ===== */
.challenge-list {
  display: grid;
  gap: 20px;
}
.challenge {
  padding: 28px;
  border-radius: 16px;
  border-left: 3px solid var(--warn);
  background: rgba(255,91,31,0.06);
}
.challenge h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--warn);
}
.challenge p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}
.challenge code {
  background: rgba(0,0,0,0.4);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--accent);
  font-size: 13px;
}

/* ===== End CTA ===== */
.end-cta {
  text-align: center;
  padding-top: 60px;
  padding-bottom: 100px;
}
.end-cta h2 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  margin-bottom: 40px;
}
.end-cta .cta-links {
  justify-content: center;
}

footer {
  padding: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
}

/* ===== Mobile ===== */
/* ============ TABLET (max 1024px) ============ */
@media (max-width: 1024px) {
  header { padding: 16px 24px; }
  nav a { margin-left: 18px; font-size: 12px; }
  .page-intro { padding: 140px 24px 60px; }
  .block { padding: 60px 24px; }
  .page-intro h1 { font-size: clamp(40px, 8vw, 72px); }
  .screenshot-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

/* ============ MOBILE (max 768px) ============ */
@media (max-width: 768px) {
  body {
    background-size: 60px 60px, 60px 60px, 300px 300px, 300px 300px;
  }

  /* Header */
  header {
    padding: 12px 16px;
    flex-wrap: nowrap;
    gap: 8px;
  }
  .logo { font-size: 13px; letter-spacing: 0.5px; }
  nav {
    display: flex;
    gap: 14px;
    flex-wrap: nowrap;
  }
  nav a {
    margin-left: 0;
    font-size: 10px;
    letter-spacing: 0.5px;
    white-space: nowrap;
  }

  /* Page intro */
  .page-intro {
    padding: 110px 18px 50px;
  }
  .page-intro h1 {
    font-size: clamp(32px, 10vw, 56px);
    line-height: 1;
  }
  .page-intro h1 .subtitle {
    font-size: clamp(14px, 4vw, 22px);
    margin-top: 8px;
  }
  .page-intro p {
    font-size: 14px !important;
    line-height: 1.6;
    padding-left: 14px;
    margin: 24px 0;
  }

  /* Project meta tags */
  .project-meta {
    gap: 8px;
    flex-wrap: wrap;
  }
  .project-meta span {
    font-size: 9px;
    padding: 4px 10px;
  }
  .back-link {
    font-size: 11px;
    margin-bottom: 20px;
  }

  /* CTA buttons */
  .cta-links {
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }
  .cta-btn {
    text-align: center;
    padding: 12px 20px;
    font-size: 12px;
    width: 100%;
  }

  /* Block sections */
  .block {
    padding: 50px 18px;
  }
  .title-label {
    font-size: 20px;
    letter-spacing: 2px;
    margin-bottom: 28px;
    padding-bottom: 12px;
  }

  /* Grids → single column */
  .screenshot-grid,
  .feature-grid,
  .stack-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* nuCrepes phone screenshots: 2 per row on mobile (still phone-shaped) */
  .nucrepes-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 12px;
  }
  .nucrepes-grid .screenshot-card img {
    max-height: 380px;
    border-radius: 18px;
  }
  .nucrepes-grid .screenshot-caption {
    font-size: 11px;
    padding: 8px 4px 4px;
  }

  /* Feature cards */
  .feature {
    padding: 20px;
  }
  .feature-icon { font-size: 26px; }
  .feature h3 { font-size: 17px; }
  .feature p { font-size: 14px; }

  /* Architecture diagram */
  .arch-diagram {
    padding: 24px 16px;
  }
  .arch-row {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .arch-row-3 .arch-node {
    width: 100%;
    min-width: 0;
  }
  .arch-node {
    padding: 16px 20px;
    min-width: 0;
  }
  .arch-node-title { font-size: 15px; }
  .arch-node-desc { font-size: 12px; }
  .arch-note { font-size: 13px; }

  /* Stack cards */
  .stack-card {
    padding: 20px;
  }
  .stack-card h3 { font-size: 14px; }
  .stack-card li {
    font-size: 13px;
    flex-wrap: wrap;
  }
  .stack-card li code { font-size: 11px; }

  /* API code blocks - prevent overflow */
  .api-group h3 {
    font-size: 12px;
    padding: 12px 16px;
  }
  .api-group pre {
    padding: 14px 16px;
    font-size: 10px !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .api-group code {
    font-size: 10px;
  }

  /* Roles table */
  .roles-table { font-size: 12px; }
  .roles-table th,
  .roles-table td {
    padding: 10px 12px;
    word-break: break-word;
  }

  /* Challenges */
  .challenge {
    padding: 20px;
  }
  .challenge h3 { font-size: 16px; }
  .challenge p { font-size: 13px; }

  /* End CTA */
  .end-cta {
    padding: 40px 18px 70px;
  }
  .end-cta h2 {
    font-size: clamp(24px, 7vw, 40px);
    margin-bottom: 28px;
  }

  /* Lightbox padding */
  .lightbox {
    padding: 20px;
  }
}

/* ============ SMALL MOBILE (max 480px) ============ */
@media (max-width: 480px) {
  header {
    padding: 10px 12px;
  }
  .logo { font-size: 11px; }
  .logo img { width: 20px; height: 20px; }
  nav { gap: 10px; }
  nav a { font-size: 9px; letter-spacing: 0.3px; }

  /* Hide email link on very small to save space */
  nav a[href^="mailto"] { display: none; }

  .page-intro {
    padding: 95px 14px 40px;
  }
  .page-intro h1 {
    font-size: clamp(28px, 9vw, 44px);
  }
  .block { padding: 40px 14px; }
  .title-label { font-size: 17px; }
  .feature h3 { font-size: 15px; }
  .feature p { font-size: 13px; }
  .api-group pre {
    font-size: 9px !important;
  }

  /* Stack cards: stack code below name */
  .stack-card li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  /* Roles table - convert to cards on mobile */
  .roles-table thead { display: none; }
  .roles-table,
  .roles-table tbody,
  .roles-table tr,
  .roles-table td { display: block; width: 100%; }
  .roles-table tr {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 12px;
  }
  .roles-table td {
    padding: 6px 0;
    border: none;
  }
  .roles-table td:first-child {
    margin-bottom: 6px;
    font-weight: 700;
  }
}