/* Project execution guide — light theme, aligned with portfolio_home.css */
:root {
  --pex-bg0: #f8faff;
  --pex-bg1: #eef2fb;
  --pex-surface: #ffffff;
  --pex-border: rgba(99, 102, 241, 0.14);
  --pex-text: #0f172a;
  --pex-muted: #64748b;
  --pex-accent: #0891b2;
  --pex-accent2: #6366f1;
  --pex-warn: #d97706;
  --pex-success: #059669;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(99, 102, 241, 0.1);
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body.pex-page {
  min-height: 100vh;
  color: var(--pex-text);
  font-family: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  background:
    radial-gradient(ellipse 100% 55% at 5% 0%, rgba(99, 102, 241, 0.09), transparent),
    radial-gradient(ellipse 70% 45% at 95% 100%, rgba(8, 145, 178, 0.07), transparent),
    linear-gradient(165deg, var(--pex-bg0) 0%, var(--pex-bg1) 50%, #f4f0ff 100%);
  background-attachment: fixed;
}

.pex-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* Top bar */
.pex-top {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(248, 250, 255, 0.92);
  border-bottom: 1px solid var(--pex-border);
  margin: 0 -1.25rem;
  padding: 0.75rem 1.25rem;
}
.pex-top-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.pex-brand {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--pex-text);
  text-decoration: none;
}
.pex-brand span { color: var(--pex-accent); }
.pex-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
}
.pex-nav a {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pex-muted);
  text-decoration: none;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.pex-nav a:hover { color: var(--pex-text); background: rgba(99, 102, 241, 0.08); }
.pex-nav .pex-nav-active { color: var(--pex-accent2); font-weight: 600; }

/* Hero */
.pex-hero {
  padding: 2.5rem 0 2rem;
  text-align: center;
}
.pex-badge {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pex-accent);
  background: rgba(8, 145, 178, 0.1);
  border: 1px solid rgba(8, 145, 178, 0.2);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.pex-hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}
.pex-hero-lead {
  max-width: 36rem;
  margin: 0 auto 1.5rem;
  color: var(--pex-muted);
  font-size: 1.1rem;
}
.pex-pill-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}
.pex-pill {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  box-shadow: var(--shadow-sm);
  color: var(--pex-text);
}
.pex-pill strong { color: var(--pex-accent2); }

/* Sections */
.pex-section {
  margin-top: 2.75rem;
}
.pex-sec-head {
  margin-bottom: 1.25rem;
}
.pex-sec-head h2 {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.pex-sec-head p {
  color: var(--pex-muted);
  margin-top: 0.35rem;
  font-size: 0.98rem;
}

/* Phase timeline */
.pex-phases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.pex-phase {
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.pex-phase::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--pex-accent), var(--pex-accent2));
  opacity: 0.85;
}
.pex-phase-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 2rem;
  font-weight: 700;
  color: rgba(99, 102, 241, 0.2);
  line-height: 1;
  margin-bottom: 0.35rem;
}
.pex-phase h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.pex-phase-time {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pex-accent);
  margin-bottom: 0.65rem;
}
.pex-phase ul {
  list-style: none;
  font-size: 0.92rem;
  color: var(--pex-muted);
}
.pex-phase li {
  padding: 0.2rem 0;
  padding-left: 1rem;
  position: relative;
}
.pex-phase li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--pex-accent2);
  font-size: 0.75rem;
}
.pex-phase a {
  color: var(--pex-accent2);
  font-weight: 600;
  text-decoration: none;
}
.pex-phase a:hover { text-decoration: underline; }
.pex-track-flow a { font-weight: 600; }

/* Tracks */
.pex-tracks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.85rem;
}
.pex-track {
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-sm);
}
.pex-track-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.5rem;
}
.pex-track-label.industrial { color: #4f46e5; }
.pex-track-label.ev { color: #0891b2; }
.pex-track-label.ml { color: #7c3aed; }
.pex-track-label.pm { color: #d97706; }
.pex-track-label.web { color: #059669; }
.pex-track-flow {
  font-size: 0.9rem;
  color: var(--pex-muted);
  line-height: 1.5;
}
.pex-track-flow a {
  color: var(--pex-accent2);
  text-decoration: none;
  font-weight: 600;
}
.pex-track-flow a:hover { text-decoration: underline; }

/* Order steps */
.pex-order {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.pex-step {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  align-items: center;
  gap: 0.85rem;
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  border-radius: 10px;
  padding: 0.65rem 1rem;
  box-shadow: var(--shadow-sm);
}
.pex-step-num {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(8,145,178,0.12));
  border-radius: 8px;
  color: var(--pex-accent2);
}
.pex-step-body a {
  color: var(--pex-text);
  font-weight: 700;
  text-decoration: none;
}
.pex-step-body a:hover { color: var(--pex-accent2); }
.pex-step-meta {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: var(--pex-muted);
  white-space: nowrap;
}
.pex-step-tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pex-muted);
  margin-top: 0.15rem;
}

/* Project grid */
.pex-domain-label {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  margin-bottom: 0.85rem;
}
.pex-domain-label.d-industrial { background: rgba(79,70,229,0.12); color: #4338ca; }
.pex-domain-label.d-ev { background: rgba(8,145,178,0.12); color: #0e7490; }
.pex-domain-label.d-data { background: rgba(124,58,237,0.12); color: #6d28d9; }
.pex-domain-label.d-robotics { background: rgba(217,119,6,0.12); color: #b45309; }
.pex-domain-label.d-web { background: rgba(5,150,105,0.12); color: #047857; }

.pex-group { margin-bottom: 2rem; }

.pex-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.85rem;
}
.pex-card {
  display: block;
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  border-radius: 12px;
  padding: 1rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.pex-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(99, 102, 241, 0.28);
}
.pex-card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}
.pex-card h3 {
  font-size: 0.98rem;
  font-weight: 700;
}
.pex-status {
  font-family: "JetBrains Mono", monospace;
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.pex-status-live { background: rgba(5,150,105,0.12); color: #047857; }
.pex-status-build { background: rgba(217,119,6,0.12); color: #b45309; }
.pex-status-ref { background: rgba(100,116,139,0.12); color: #475569; }
.pex-card p {
  font-size: 0.88rem;
  color: var(--pex-muted);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}
.pex-card-repo {
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  color: var(--pex-accent);
}

.pex-card-static {
  cursor: default;
}
.pex-card-static:hover {
  transform: none;
}

/* Flow diagram */
.pex-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 0.35rem;
  padding: 1.25rem;
  background: var(--pex-surface);
  border: 1px solid var(--pex-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.pex-flow-node {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid var(--pex-border);
  color: var(--pex-text);
  text-decoration: none;
}
a.pex-flow-node:hover {
  background: rgba(99, 102, 241, 0.16);
  color: var(--pex-accent2);
}
.pex-flow-arrow {
  color: var(--pex-muted);
  font-size: 0.85rem;
}

/* CTA box */
.pex-cta {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(8,145,178,0.06));
  border: 1px solid var(--pex-border);
  text-align: center;
}
.pex-cta h2 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.pex-cta p { color: var(--pex-muted); margin-bottom: 1rem; font-size: 0.95rem; }
.pex-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
}
.pex-btn {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  text-decoration: none;
  transition: filter 0.15s;
}
.pex-btn-primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
}
.pex-btn-ghost {
  background: var(--pex-surface);
  color: var(--pex-text);
  border: 1px solid var(--pex-border);
}
.pex-btn:hover { filter: brightness(1.06); }

.pex-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--pex-border);
  text-align: center;
  font-size: 0.88rem;
  color: var(--pex-muted);
}
.pex-footer a { color: var(--pex-accent2); }

@media (max-width: 640px) {
  .pex-step {
    grid-template-columns: 2.5rem 1fr;
  }
  .pex-step-meta {
    grid-column: 2;
    white-space: normal;
  }
}