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

:root {
  --white: #ffffff;
  --gray-bg: #f2f2f2;
  --text: #222222;
  --text-muted: #555555;
  --text-light: #888888;
  --accent: #c03;   /* crimson red */
  --border: #cccccc;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 900px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ─── HEADER — white zone ─── */
header {
  background: var(--white);
  text-align: center;
  padding: 52px 32px 40px;
}

.site-name {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
  margin-bottom: 28px;
  line-height: 1.15;
}

nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 7px 24px;
  border-radius: 999px;
  transition: color 0.15s;
  font-weight: 400;
}

nav a:hover {
  color: var(--text);
}

nav a.active {
  background: var(--accent);
  color: #fff;
  font-style: italic;
  font-weight: 500;
}

/* ─── Hero intro (index.html only) ─── */
.hero-intro {
  margin-bottom: 36px;
}

.hero-role {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.hero-tagline {
  font-size: 0.9375rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-cta-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.btn {
  display: inline-block;
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: #a30229;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── DIVIDER between white header and gray content ─── */
.header-divider {
  border: none;
  border-top: 1px solid #ddd;
  margin: 0;
}

/* ─── MAIN — gray zone ─── */
main {
  background: var(--gray-bg);
  min-height: 100vh;
}

.main-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px 80px;
}

/* ─── Section wrapper ─── */
.section-block {
  padding: 52px 0 0;
  border-bottom: none;
}

/* ─── Centered heading with horizontal rules ─── */
.section-heading {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 36px;
}

.section-heading::before,
.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.section-heading span {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

/* ─── Left-aligned section heading (for sub-sections) ─── */
.sub-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin: 32px 0 12px;
  letter-spacing: -0.02em;
}

/* ─── Socials ─── */
.socials-row {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.social-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #555;
  transition: color 0.15s;
}

.social-item:hover { color: var(--accent); }

.social-item svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.social-item span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ─── About photo ─── */
.photo-banner {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 32px;
  border-radius: 4px;
}

/* ─── Body text ─── */
.body-text p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 16px;
}

.body-text p:last-child { margin-bottom: 0; }

.body-text strong { color: var(--text); font-weight: 600; }

.body-text a {
  color: var(--accent);
  text-decoration: none;
}

.body-text a:hover { text-decoration: underline; }

/* ─── Projects ─── */
.project-entry {
  padding-bottom: 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border);
}

.project-entry.featured {
  border-left: 3px solid var(--accent);
  padding-left: 18px;
}

.project-entry.featured h3 {
  font-size: 1.05rem;
}

.project-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.project-entry h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.project-entry .proj-meta {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.project-entry .proj-meta a {
  color: var(--accent);
  text-decoration: none;
}

.project-entry .proj-meta a:hover { text-decoration: underline; }

.project-entry p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 10px;
}

.project-entry p strong { color: var(--text); font-weight: 600; }

.proj-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: -2px;
  margin-bottom: 10px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
}

/* ─── SignBridge module breakdown ─── */
.module-details {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  background: var(--white);
}

.module-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.module-details summary::-webkit-details-marker { display: none; }

.module-details summary::before {
  content: '▸';
  color: var(--accent);
  font-size: 0.75rem;
  transition: transform 0.15s;
}

.module-details[open] summary::before { transform: rotate(90deg); }

.module-details summary:hover { color: var(--accent); }

.module-flow {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.module-arrow {
  text-align: center;
  color: var(--text-light);
  font-size: 0.85rem;
}

.module-step {
  padding: 12px 14px;
  border-left: 2px solid var(--border);
  background: var(--gray-bg);
  border-radius: 4px;
}

.module-step-featured {
  border-left: 2px solid var(--accent);
  background: rgba(204, 0, 51, 0.06);
}

.module-step-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.module-step p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.module-video {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 12px 0 0;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #000;
}

.module-video-featured {
  max-width: 100%;
}

.signbridge-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  font-size: 0.78rem;
  color: var(--text-light);
  font-style: italic;
  line-height: 1.6;
}

.tag {
  font-size: 0.7rem;
  background: #e0e0e0;
  color: #444;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
}

/* ─── Experience ─── */
.exp-entry {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.exp-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 10px;
}

.exp-date {
  font-size: 0.78rem;
  color: var(--text-light);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 3px;
  font-style: italic;
}

.exp-entry h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}

.exp-org {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.exp-detail {
  font-size: 0.8rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-top: 2px;
}

.exp-entry .exp-meta {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

/* Skills grid (experience page) */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-group h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.skill-group p {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Cert issuer line */
.cert-issuer {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 2px;
}

.exp-entry ul {
  list-style: none;
  padding: 0;
}

.exp-entry ul li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
  margin-bottom: 5px;
  line-height: 1.7;
}

.exp-entry ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-light);
}

/* ─── Certifications ─── */
.cert-list {
  list-style: none;
}

.cert-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.cert-list li:first-child { border-top: 1px solid var(--border); }

.cert-name { font-weight: 600; color: var(--text); }
.cert-meta { font-size: 0.8rem; color: var(--text-light); text-align: right; }

/* ─── Education ─── */
.edu-entry {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.edu-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.edu-entry h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.edu-entry p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2px;
  line-height: 1.6;
}

/* ─── Footer ─── */
footer {
  background: var(--gray-bg);
  text-align: center;
  padding: 24px 32px 40px;
  font-size: 0.78rem;
  color: var(--text-light);
  border-top: 1px solid var(--border);
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .site-name { font-size: 1.75rem; }
  nav a { font-size: 0.82rem; padding: 6px 14px; }
  .main-inner { padding: 0 24px 44px; }
  .photo-banner { height: auto; margin-bottom: 20px; }
  .cert-list li { flex-direction: column; gap: 2px; }
  .cert-meta { text-align: left; }
  .socials-row { gap: 28px; }
  .hero-role { font-size: 0.95rem; }
  .hero-tagline { font-size: 0.875rem; padding: 0 8px; }

  .hero-cta-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    justify-items: stretch;
  }
  .btn {
    padding: 10px 12px;
    font-size: 0.8rem;
    text-align: center;
  }

  .section-block { padding-top: 30px; }
  .section-heading { margin-bottom: 22px; }

  .module-details { padding: 10px 12px; }
  .module-step { padding: 10px 12px; }
}