/* ════════════════════════════════════════════════════════════
   PROJECT DETAIL PAGE — shared styles
   ════════════════════════════════════════════════════════════ */

/* ── Nav always scrolled on detail pages ── */
.navbar.scrolled {
  background: rgba(255,255,255,0.96) !important;
  box-shadow: 0 2px 24px rgba(0,0,80,0.08) !important;
}

/* ── Hero ── */
.pd-hero {
  min-height: 92vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 120px 80px 80px;
  position: relative;
  overflow: hidden;
  gap: 60px;
}
.pd-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.pd-hero--hydrogen .pd-hero-bg {
  background: linear-gradient(135deg, #060e1e 0%, #08172e 50%, #040d1c 100%);
}
.pd-hero--medbatt .pd-hero-bg {
  background: linear-gradient(135deg, #030d08 0%, #051a10 50%, #020c07 100%);
}
.pd-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
}
.pd-hero-content {
  position: relative;
  z-index: 1;
}
.pd-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.5);
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 1px;
  text-decoration: none;
  margin-bottom: 28px;
  transition: color 0.2s;
}
.pd-back:hover { color: rgba(255,255,255,0.9); }
.pd-hero-tag {
  font-family: var(--font-head);
  font-size: 0.65rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.pd-hero-title {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 900;
  color: #ffffff;
  line-height: 1.05;
  margin-bottom: 20px;
}
.pd-hero-accent { color: #38bdf8; }
.pd-hero-accent--green { color: #34d399; }
.pd-hero-sub {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.75;
  max-width: 480px;
  margin-bottom: 32px;
}
.pd-hero-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.pd-meta-pill {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.55);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 20px;
  padding: 6px 14px;
}
.pd-meta-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.pd-meta-dot--active {
  background: #38bdf8;
  box-shadow: 0 0 0 3px rgba(56,189,248,0.2);
  animation: pulseDot 2s ease-in-out infinite;
}
.pd-meta-dot--research {
  background: #34d399;
  box-shadow: 0 0 0 3px rgba(52,211,153,0.2);
  animation: pulseDot 2s ease-in-out infinite 0.5s;
}
.pd-hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pd-hero-svg-wrap {
  position: relative;
  filter: drop-shadow(0 0 60px rgba(56,189,248,0.2));
  animation: heroFloat 4s ease-in-out infinite;
}
.pd-hero--medbatt .pd-hero-svg-wrap {
  filter: drop-shadow(0 0 60px rgba(52,211,153,0.2));
}
@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-14px); }
}

/* ── Section base ── */
.pd-section {
  padding: 96px 0;
}
.pd-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}
.pd-section-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 24px;
}
.pd-body-text {
  font-family: var(--font-body);
  font-size: 0.96rem;
  color: var(--text);
  line-height: 1.85;
  margin-bottom: 18px;
  max-width: 540px;
}

/* ── Overview ── */
.pd-overview { background: var(--bg-deep); }
.pd-overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.pd-stats-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.pd-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.pd-stat-card:hover { transform: translateY(-3px); }
.pd-stat-num {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
  margin-bottom: 6px;
}
.pd-stat-card--green .pd-stat-num { color: #059669; }
.pd-stat-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  line-height: 1.4;
}

/* ── Problem / Solution ── */
.pd-problem-sol { background: var(--bg-dark); }
.pd-ps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.pd-ps-card {
  border-radius: 20px;
  padding: 36px;
  border: 1px solid var(--border);
}
.pd-ps-card--problem {
  background: rgba(239,68,68,0.04);
  border-color: rgba(239,68,68,0.15);
}
.pd-ps-card--solution {
  background: rgba(56,189,248,0.04);
  border-color: rgba(56,189,248,0.15);
}
.pd-ps-card--green {
  background: rgba(52,211,153,0.04);
  border-color: rgba(52,211,153,0.15);
}
.pd-ps-icon { margin-bottom: 16px; }
.pd-ps-card h3 {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 16px;
}
.pd-ps-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pd-ps-card--problem ul li::before {
  content: '×';
  color: #ef4444;
  font-weight: 700;
  margin-right: 10px;
}
.pd-ps-card--solution ul li::before,
.pd-ps-card--green ul li::before {
  content: '✓';
  color: var(--cyan);
  font-weight: 700;
  margin-right: 10px;
}
.pd-ps-card--green ul li::before { color: #10b981; }
.pd-ps-card li {
  font-family: var(--font-body);
  font-size: 0.86rem;
  color: var(--text);
  line-height: 1.5;
}

/* ── Features ── */
.pd-features { background: var(--bg-deep); }
.pd-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.pd-feat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.pd-feat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,60,0.10);
}
.pd-feat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--feat-color, var(--cyan)) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--feat-color, var(--cyan)) 30%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--feat-color, var(--cyan));
  margin-bottom: 16px;
}
.pd-feat-card h4 {
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--white);
  margin-bottom: 10px;
}
.pd-feat-card p {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ── Use cases ── */
.pd-usecases { background: var(--bg-dark); }
.pd-usecase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.pd-usecase-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 22px;
  text-align: center;
  transition: transform 0.2s;
}
.pd-usecase-card:hover { transform: translateY(-4px); }
.pd-usecase-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  display: block;
}
.pd-usecase-card h4 {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}
.pd-usecase-card p {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ── Timeline / Roadmap ── */
.pd-roadmap { background: var(--bg-dark); }
.pd-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 720px;
  margin: 48px auto 0;
  position: relative;
}
.pd-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan) 0%, var(--border) 100%);
}
.pd-tl-item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 24px;
  padding-bottom: 40px;
  position: relative;
}
.pd-tl-item:last-child { padding-bottom: 0; }
.pd-tl-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid var(--border);
  margin-top: 5px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  background: var(--bg-dark);
  border-color: var(--muted);
  left: 2px;
}
.pd-tl-done .pd-tl-dot { background: var(--cyan); border-color: var(--cyan); }
.pd-tl-dot--green       { border-color: #10b981 !important; }
.pd-tl-done .pd-tl-dot--green { background: #10b981 !important; }
.pd-tl-active .pd-tl-dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0,144,184,0.2);
  animation: pulseDot 2s ease-in-out infinite;
}
.pd-tl-active .pd-tl-dot--pulse {
  background: #10b981 !important;
  border-color: #10b981 !important;
  box-shadow: 0 0 0 4px rgba(16,185,129,0.2);
}
.pd-tl-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 26px;
}
.pd-tl-active .pd-tl-content {
  border-color: rgba(0,144,184,0.3);
  background: rgba(0,144,184,0.04);
}
.pd-tl-phase {
  font-family: var(--font-head);
  font-size: 0.6rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 6px;
}
.pd-tl-content h4 {
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.pd-tl-content p {
  font-family: var(--font-body);
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 12px;
}
.pd-tl-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.68rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(0,144,184,0.10);
  border: 1px solid rgba(0,144,184,0.25);
  color: var(--cyan);
}
.pd-tl-tag--active  { background: rgba(0,144,184,0.12); color: var(--cyan); }
.pd-tl-tag--research { background: rgba(16,185,129,0.10); border-color: rgba(16,185,129,0.25); color: #10b981; }
.pd-tl-tag--upcoming {
  background: rgba(0,0,60,0.04);
  border-color: var(--border);
  color: var(--muted);
}

/* ── CTA ── */
.pd-cta {
  background: #0a1628;
  padding: 96px 0;
  text-align: center;
}
.pd-cta--green { background: #031a10; }
.pd-cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.pd-cta h2 {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.2;
}
.pd-cta p {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: rgba(255,255,255,0.5);
  max-width: 500px;
  line-height: 1.7;
}
.pd-cta-btns {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn-primary {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 14px 32px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  color: #fff;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
  display: inline-block;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-2px); }
.btn-outline {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 13px 32px;
  border-radius: 8px;
  background: transparent;
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.2);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
  display: inline-block;
}
.btn-outline:hover {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
  transform: translateY(-2px);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .pd-hero {
    grid-template-columns: 1fr;
    padding: 100px 32px 60px;
    min-height: auto;
  }
  .pd-hero-visual { display: none; }
  .pd-overview-grid  { grid-template-columns: 1fr; }
  .pd-ps-grid        { grid-template-columns: 1fr; }
  .pd-features-grid  { grid-template-columns: repeat(2, 1fr); }
  .pd-usecase-grid   { grid-template-columns: repeat(2, 1fr); }
  .pd-container      { padding: 0 24px; }
}
@media (max-width: 600px) {
  .pd-features-grid { grid-template-columns: 1fr; }
  .pd-usecase-grid  { grid-template-columns: 1fr; }
  .pd-stats-col     { grid-template-columns: 1fr 1fr; }
}

/* ── Prototype & Mechanism sections ── */
.pd-proto,
.pd-mechanism {
  background: var(--bg-dark);
}
.pd-proto-wrap,
.pd-mech-wrap {
  max-width: 1000px;
  margin: 0 auto;
}
.pd-proto-controls,
.pd-mech-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.pd-ctrl-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-head);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 9px 18px;
  border-radius: 8px;
  cursor: pointer;
  background: #0a1628;
  border: 1px solid rgba(0,144,184,0.35);
  color: var(--cyan);
  transition: background 0.2s, color 0.2s;
}
.pd-ctrl-btn:hover {
  background: var(--cyan);
  color: #fff;
  border-color: var(--cyan);
}
.pd-ctrl-btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}
.pd-ctrl-btn--ghost:hover {
  background: var(--bg-card);
  color: var(--white);
  border-color: var(--muted);
}
.pd-ctrl-label,
.pd-mech-stage {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--muted);
  margin-left: auto;
}
.pd-proto-canvas,
.pd-mech-canvas {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(0,60,200,0.12);
  box-shadow: 0 12px 48px rgba(0,0,40,0.10);
}
.pd-proto-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.pd-proto-legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text);
}
.pd-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.pd-mech-caption {
  margin-top: 20px;
  font-family: var(--font-body);
  font-size: 0.86rem;
  color: var(--text);
  line-height: 1.8;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.pd-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--cyan);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  font-family: var(--font-head);
  vertical-align: middle;
  margin: 0 2px;
}