:root {
  --bg: #0d1117;
  --bg-alt: #12181f;
  --surface: #161d27;
  --surface-hover: #1c2530;
  --border: #263241;
  --text: #e6edf3;
  --text-dim: #9fb0c0;
  --accent: #6ea8fe;
  --accent-2: #7ce8c8;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

header.hero {
  padding: 96px 0 64px;
  background:
    radial-gradient(600px 300px at 15% 0%, rgba(110,168,254,0.15), transparent 60%),
    radial-gradient(500px 280px at 85% 10%, rgba(124,232,200,0.12), transparent 60%);
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  color: var(--accent-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(32px, 5vw, 48px);
  margin: 0 0 16px;
  line-height: 1.15;
}

.hero p.lead {
  color: var(--text-dim);
  font-size: 18px;
  max-width: 620px;
  margin: 0;
}

.hero-links {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.section-nav {
  margin-top: 36px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.section-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.section-nav a:hover {
  color: var(--accent);
}

/* top nav (subpages) */

.topnav {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
  background: var(--bg);
}

.topnav .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.topnav .brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.01em;
}

.topnav .brand:hover {
  color: var(--accent);
}

.topnav nav {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
}

.topnav nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.topnav nav a:hover {
  color: var(--accent);
}

.topnav nav a.active {
  color: var(--accent-2);
}

/* landing banners */

.banner-grid {
  display: flex;
  gap: 20px;
}

.banner {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  flex: 1 1 0;
  min-width: 0;
  min-height: 460px;
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  transition: flex-grow 0.35s ease, transform 0.2s ease, filter 0.2s ease;
}

.banner:hover {
  flex-grow: 2;
  transform: translateY(-4px);
  filter: brightness(1.08);
}

.banner .banner-num {
  position: absolute;
  top: 24px;
  left: 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0.7;
}

.banner h2 {
  font-size: 24px;
  margin: 0 0 8px;
}

.banner p {
  font-size: 14px;
  margin: 0 0 16px;
  opacity: 0.85;
  max-width: 32ch;
}

.banner .banner-cta {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.banner-tech {
  background: linear-gradient(160deg, #0b0f2b 0%, #1c1440 100%);
}

.banner-eng {
  background: linear-gradient(160deg, #1a1f26 0%, #2c3540 100%);
}

.banner-re {
  background: linear-gradient(160deg, #3a2a1a 0%, #6b4a2b 100%);
}

.banner-biz {
  background: linear-gradient(160deg, #0f2e28 0%, #164a3d 100%);
}

.banner-tech .banner-cta { color: #b7aaff; }
.banner-eng .banner-cta { color: #ff9d3d; }
.banner-re .banner-cta { color: #e7c98a; }
.banner-biz .banner-cta { color: #7ce8c8; }

@media (max-width: 900px) {
  .banner-grid { flex-wrap: wrap; }
  .banner { flex: 1 1 calc(50% - 10px); min-height: 320px; }
  .banner:hover { flex-grow: 1; transform: none; }
}

@media (max-width: 560px) {
  .banner-grid { flex-direction: column; }
  .banner { min-height: 220px; }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn.primary {
  background: var(--accent);
  color: #06141f;
  border-color: var(--accent);
}

.btn.primary:hover {
  filter: brightness(1.08);
}

main {
  padding: 0;
}

.section {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
  background: var(--ov-bg, transparent);
  color: var(--ov-text, inherit);
}

.section.alt {
  background: var(--ov-bg, var(--bg-alt));
}

.section-plain {
  padding: 48px 0 64px;
  background: var(--ov-bg, transparent);
  color: var(--ov-text, inherit);
}

/* CMS style overrides: a section (or a card/timeline-item/banner within it)
   carrying --ov-* custom properties re-scopes the design tokens locally,
   so every element inside naturally picks up the override via cascade. */
.section[style*="--ov-accent"],
.section-plain[style*="--ov-accent"],
.card[style*="--ov-accent"],
.tl-item[style*="--ov-accent"],
.banner[style*="--ov-accent"] {
  --accent: var(--ov-accent);
  --accent-2: var(--ov-accent);
}

.card[style*="--ov-bg"] {
  background: var(--ov-bg);
}

.card[style*="--ov-text"] .desc,
.card[style*="--ov-text"] h3 {
  color: var(--ov-text);
}

.section[style*="--ov-radius"] .card,
.section[style*="--ov-radius"] .info-card,
.section[style*="--ov-radius"] .stat,
.section-plain[style*="--ov-radius"] .banner,
.card[style*="--ov-radius"],
.banner[style*="--ov-radius"],
.tl-item[style*="--ov-radius"],
.info-card[style*="--ov-radius"] {
  border-radius: var(--ov-radius);
}

.section .eyebrow {
  margin-bottom: 8px;
}

.section-title {
  font-size: 28px;
  margin: 0 0 12px;
}

.section-lead {
  color: var(--text-dim);
  font-size: 15.5px;
  max-width: 680px;
  margin: 0 0 36px;
}

.section-lead.placeholder-note {
  font-style: italic;
  opacity: 0.75;
  margin-bottom: 0;
}

.subsection-title {
  font-size: 19px;
  margin: 48px 0 24px;
}

.edu-cert-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 8px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.info-card img.cover {
  width: calc(100% + 48px);
  margin: -22px -24px 18px;
  border-radius: var(--radius) var(--radius) 0 0;
  aspect-ratio: 600 / 340;
  object-fit: contain;
  background: #fff;
  display: block;
}

.info-card h4 {
  margin: 0 0 12px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-2);
}

.info-title {
  font-weight: 700;
  margin: 0 0 4px;
  font-size: 16px;
}

.info-sub {
  color: var(--text-dim);
  font-size: 13.5px;
  margin: 0 0 12px;
}

.info-card .desc {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
}

/* stats */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: var(--accent-2);
}

.stat-label {
  display: block;
  font-size: 12.5px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* timeline */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.tl-item {
  position: relative;
  padding: 0 0 36px 32px;
  border-left: 2px solid var(--border);
}

.tl-item:last-child {
  padding-bottom: 0;
}

.tl-marker {
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.section.alt .tl-marker {
  border-color: var(--bg-alt);
}

.tl-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.tl-header h4 {
  margin: 0;
  font-size: 17px;
}

.tl-date {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.tl-place {
  color: var(--text-dim);
  font-size: 13.5px;
  margin: 4px 0 10px;
}

.tl-content ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 14.5px;
}

.tl-content li {
  margin-bottom: 6px;
}

.tl-content a {
  color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.card .cover {
  aspect-ratio: 600 / 340;
  width: 100%;
  display: block;
  background: var(--bg-alt);
  object-fit: cover;
  border-bottom: 1px solid var(--border);
}

/* tech project grid: hover-to-expand with image galleries */

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
}

.tech-grid .card {
  flex: 1 1 0;
  min-width: 280px;
  height: 440px;
  transition: flex-grow 0.35s ease, transform 0.18s ease, border-color 0.18s ease;
}

.tech-grid .card:hover {
  flex-grow: 2.4;
  transform: translateY(-3px);
}

/* image area: fixed height slice of the card, grows on hover as the
   text area below shrinks — total card height never changes */

.tech-grid .card .cover,
.tech-grid .card .cover-gallery {
  aspect-ratio: unset;
  flex: 0 0 190px;
  transition: flex-basis 0.35s ease;
}

.tech-grid .card:hover .cover,
.tech-grid .card:hover .cover-gallery {
  flex-basis: 350px;
}

.cover-gallery {
  display: flex;
  overflow: hidden;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.cover-gallery img {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: flex-basis 0.35s ease;
}

.tech-grid .card:hover .cover-gallery img {
  flex-basis: 50%;
}

.tech-grid .card-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  transition: padding 0.25s ease, gap 0.25s ease, background 0.25s ease;
}

.tech-grid .card:hover .card-body {
  padding: 10px 16px 12px;
  gap: 4px;
  background: rgba(13, 17, 23, 0.72);
}

.tech-grid .card:hover .card-body p.desc,
.tech-grid .card:hover .card-body .tags,
.tech-grid .card:hover .card-body .status {
  display: none;
}

.tech-grid .card:hover .card-body h3 {
  font-size: 15px;
}

.tech-grid .card:hover .card-body .card-actions {
  margin-top: 0;
}

.tech-grid .card:hover .card-body .card-actions .btn {
  padding: 5px 11px;
  font-size: 12px;
}

.card-body {
  padding: 20px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.card-body h3 {
  margin: 0;
  font-size: 19px;
}

.status {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  width: fit-content;
}

.status.live {
  background: rgba(124,232,200,0.14);
  color: var(--accent-2);
  border: 1px solid rgba(124,232,200,0.3);
}

.status.source {
  background: rgba(110,168,254,0.12);
  color: var(--accent);
  border: 1px solid rgba(110,168,254,0.3);
}

.card-body p.desc {
  color: var(--text-dim);
  font-size: 14.5px;
  margin: 0;
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 2px 0 4px;
}

.tag {
  font-size: 11.5px;
  color: var(--text-dim);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 999px;
}

.card-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.card-actions .btn {
  padding: 8px 14px;
  font-size: 13px;
}

a.card.link-card {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.card .cover.book-cover {
  object-fit: contain;
  background: #fff;
  padding: 14px;
}

.link-domain {
  font-size: 12px;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* project detail pages */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 24px;
}

.back-link:hover {
  color: var(--accent);
}

.detail-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 32px 0 8px;
}

.detail-gallery img {
  width: 100%;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  aspect-ratio: 600 / 340;
  object-fit: cover;
  background: var(--bg-alt);
}

.detail-gallery.single {
  grid-template-columns: minmax(280px, 640px);
}

.detail-prose {
  max-width: 720px;
  margin-top: 40px;
}

.detail-prose h3 {
  font-size: 19px;
  margin: 0 0 16px;
}

.detail-prose p {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0 0 16px;
}

.detail-prose p:last-child {
  margin-bottom: 0;
}

footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 60px;
  color: var(--text-dim);
  font-size: 14px;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

footer a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 18px;
}

footer a:hover {
  color: var(--accent);
}

@media (max-width: 520px) {
  header.hero { padding: 64px 0 44px; }
  footer .wrap { flex-direction: column; align-items: flex-start; }
  footer a { margin-left: 0; margin-right: 18px; }
}