/* ─────────────────────────────────────────
   PROJECT PAGE HERO
───────────────────────────────────────── */
.proj-page-hero {
  min-height: 50vh;
  display: flex;
  align-items: flex-end;
  padding: 10rem 6vw 5rem;
  position: relative;
  overflow: hidden;
  background: var(--black);
  border-bottom: 1px solid var(--border);
}

.proj-page-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--amber); }

.proj-page-badges {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1.2rem;
}

.proj-page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.2rem;
}

.proj-page-title span { color: var(--amber); }

.proj-page-sub {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.75;
  max-width: 620px;
  margin-bottom: 2rem;
}

.proj-page-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ─────────────────────────────────────────
   PAGE BODY LAYOUT
   Sidebar + main content side by side
───────────────────────────────────────── */
.proj-page-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  background: var(--deep);
  min-height: 100vh;
  width: 100%;
}

/* ─────────────────────────────────────────
   SIDEBAR NAV
───────────────────────────────────────── */
.proj-page-nav {
  border-right: 1px solid var(--border);
  padding: 4rem 0 4rem 6vw;
  background: var(--black);
}

.sticky-nav {
  position: sticky;
  top: 100px; /* below the fixed nav */
}

.sticky-nav-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.sticky-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.snav-link {
  display: block;
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  padding: 0.45rem 0.8rem;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.snav-link:hover,
.snav-link.active {
  color: var(--amber);
  border-left-color: var(--amber);
}

/* ─────────────────────────────────────────
   MAIN CONTENT
───────────────────────────────────────── */
.proj-page-main {
  padding: 5rem 6vw 6rem;
  width: 100%;
  min-width: 0; /* prevents grid blowout */
}

/* ─────────────────────────────────────────
   CONTENT SECTIONS
───────────────────────────────────────── */
.proj-section {
  margin-bottom: 6rem;
}

.proj-section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.proj-section-label::after {
  content: '';
  flex: 1;
  max-width: 40px;
  height: 1px;
  background: var(--amber);
  opacity: 0.4;
}

.proj-section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.2rem;
}

.proj-section p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.proj-section-intro {
  font-size: 1rem !important;
  color: var(--text) !important;
  margin-bottom: 3rem !important;
}

/* ── STATS ROW ── */
.proj-stats-row {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.proj-stat { display: flex; flex-direction: column; gap: 0.2rem; }

.proj-stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}

.proj-stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── PROBLEM GRID ── */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 2rem;
}

.problem-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s;
}

.problem-card:hover { border-color: rgba(240,165,0,0.2); }

.problem-icon { font-size: 1.5rem; margin-bottom: 0.6rem; }

.problem-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.4rem;
}

.problem-desc { font-size: 0.82rem; color: var(--muted); line-height: 1.55; }

/* ── FEATURE BLOCKS ── */
.feature-blocks {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 1rem;
}

.feature-block {
  display: flex;
  gap: 1.5rem;
  padding: 1.8rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s;
}

.feature-block:hover { border-color: rgba(240,165,0,0.2); }

.feature-block-icon { font-size: 1.6rem; flex-shrink: 0; margin-top: 0.1rem; }

.feature-block-body h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.6rem;
}

.feature-block-body p {
  font-size: 0.87rem !important;
  color: var(--muted) !important;
  line-height: 1.7 !important;
  margin: 0 !important;
}

/* ─────────────────────────────────────────
   ENGINEERING BLOCKS
   The "How I Built This" pattern cards
───────────────────────────────────────── */
.engineering-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: 0 12px 12px 0;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: box-shadow 0.25s;
}

.engineering-block:hover {
  box-shadow: 0 4px 30px rgba(240,165,0,0.06);
}

.eng-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.eng-pattern-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  background: rgba(240,165,0,0.1);
  border: 1px solid rgba(240,165,0,0.25);
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
}

.eng-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
}

.eng-desc {
  font-size: 0.9rem !important;
  color: var(--muted) !important;
  line-height: 1.75 !important;
  margin-bottom: 1.5rem !important;
}

/* Translation card */
.eng-translation {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  margin-bottom: 1.5rem;
  min-width: 0;
}

.eng-trans-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.eng-trans-col p {
  font-size: 0.85rem !important;
  color: var(--muted) !important;
  line-height: 1.5 !important;
  margin: 0 !important;
}

.eng-trans-col p strong { color: var(--text); font-weight: 600; }

.eng-trans-arrow {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--amber);
  text-align: center;
  flex-shrink: 0;
}

/* Code block */
.code-block {
  background: #0d0d14;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.code-block-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.1em;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 1rem;
}

.code-block pre {
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin: 0;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #c9d1d9;
  line-height: 1.7;
  white-space: pre;
}

/* ── ARCHITECTURE DIAGRAM ── */
.arch-grid {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  margin-top: 2rem;
}

.arch-layer {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  width: 100%;
  transition: border-color 0.2s;
}

.arch-layer:hover { border-color: rgba(240,165,0,0.2); }

.arch-layer-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.arch-layer-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.arch-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
}

.arch-arrow {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 1rem;
  padding: 0.5rem 1.5rem;
  opacity: 0.5;
}

/* ── ROADMAP ── */
.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 2rem;
  border-left: 2px solid var(--border);
  padding-left: 2rem;
}

.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  position: relative;
}

.roadmap-dot {
  position: absolute;
  left: -2.45rem;
  top: 1.3rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--black);
  flex-shrink: 0;
}

.roadmap-item.done .roadmap-dot {
  background: var(--amber);
  border-color: var(--amber);
}

.roadmap-item.planned .roadmap-dot {
  background: transparent;
  border-color: var(--dim);
}

.roadmap-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.2rem;
}

.roadmap-item.planned .roadmap-title { color: var(--muted); }

.roadmap-desc {
  font-size: 0.82rem;
  color: var(--dim);
  line-height: 1.5;
}

/* ── NEXT PROJECT ── */
.next-project {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-top: 2rem;
}

.next-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.next-link {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--amber);
  text-decoration: none;
  transition: opacity 0.2s;
}

.next-link:hover { opacity: 0.7; }

/* ─────────────────────────────────────────
   DEMO SECTION
───────────────────────────────────────── */
.demo-block {
  margin-bottom: 4rem;
}

.demo-block-header {
  margin-bottom: 2rem;
}

.demo-block-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.6rem;
}

.demo-block-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.demo-block-desc {
  font-size: 0.88rem !important;
  color: var(--muted) !important;
  line-height: 1.7 !important;
  margin: 0 !important;
  max-width: 580px;
}

/* ── LIVE APP PLACEHOLDER ── */
.demo-live-placeholder {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 3.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.8rem;
}

.demo-live-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.demo-live-status {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.demo-live-note {
  font-size: 0.85rem !important;
  color: var(--muted) !important;
  line-height: 1.7 !important;
  margin: 0 !important;
  max-width: 480px;
}

/* Live app active button — used when placeholder is removed */
.demo-live-btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--black);
  background: linear-gradient(135deg, var(--amber), var(--amber2));
  padding: 0.9rem 2.2rem;
  border-radius: 6px;
  text-decoration: none;
  margin-top: 0.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.demo-live-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(240, 165, 0, 0.25);
}

/* ── SCREENSHOTS GRID ── */
.demo-screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.demo-screenshot-item {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* Placeholder slot — remove this when adding real image */
.demo-screenshot-slot {
  aspect-ratio: 16 / 10;
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 1rem;
  transition: border-color 0.2s;
}

.demo-screenshot-slot:hover {
  border-color: rgba(240, 165, 0, 0.3);
}

.demo-slot-icon {
  font-size: 1.5rem;
  opacity: 0.4;
}

.demo-slot-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.demo-slot-hint {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--dim);
  text-align: center;
  line-height: 1.4;
}

/* Real screenshot image — used when placeholder is removed */
.demo-screenshot-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: block;
  transition: border-color 0.2s, transform 0.2s;
}

.demo-screenshot-img:hover {
  border-color: rgba(240, 165, 0, 0.3);
  transform: translateY(-2px);
}

.demo-screenshot-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-align: center;
}

/* ── VIDEO PLACEHOLDER ── */
.demo-video-placeholder {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  transition: border-color 0.2s;
}

.demo-video-placeholder:hover {
  border-color: rgba(240, 165, 0, 0.2);
}

.demo-video-play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--amber);
  opacity: 0.5;
  margin-bottom: 0.5rem;
}

.demo-video-status {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.demo-video-note {
  font-size: 0.85rem !important;
  color: var(--muted) !important;
  line-height: 1.7 !important;
  margin: 0 !important;
  max-width: 480px;
}

/* Real video elements — used when placeholder is removed */
.demo-video {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: block;
}

.demo-video-embed {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 ratio */
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.demo-video-iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ─────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────── */
@media (max-width: 900px) {
  /* Stack sidebar above content on tablet */
  .proj-page-body {
    grid-template-columns: 1fr;
  }

  .proj-page-nav {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 2rem 6vw;
  }

  .sticky-nav { position: static; }

  .sticky-nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.3rem;
  }

  .snav-link {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 0.3rem 0.6rem;
    font-size: 0.78rem;
  }

  .snav-link:hover,
  .snav-link.active {
    border-left-color: transparent;
    border-bottom-color: var(--amber);
  }

  .eng-translation {
    grid-template-columns: 1fr;
  }

  .eng-trans-arrow { text-align: left; }

  .demo-screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .proj-page-hero  { padding: 8rem 5vw 3rem; }
  .proj-page-main  { padding: 3rem 5vw 4rem; }
  .problem-grid    { grid-template-columns: 1fr; }
  .feature-block   { flex-direction: column; gap: 0.8rem; }
  .proj-stats-row  { gap: 1.5rem; }
  .next-project    { flex-direction: column; gap: 0.8rem; align-items: flex-start; }
}

@media (max-width: 560px) {
  .demo-screenshots-grid {
    grid-template-columns: 1fr;
  }

  .demo-live-placeholder,
  .demo-video-placeholder {
    padding: 2.5rem 1.2rem;
  }
}