/* ── Reset & base ───────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:   #111111;
  --grey:    #555555;
  --light:   #f5f5f3;
  --border:  #e2e2de;
  --accent:  #059b6b;
  --accent-light: #d4f3e9;
  --white:   #ffffff;
  --max:     720px;
  --mono:    'Courier New', Courier, monospace;
}

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: 'Georgia', serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Nav ────────────────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  z-index: 10;
  padding: 0 24px;
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-name {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
  text-decoration: none;
  color: var(--black);
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  color: var(--grey);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--black); }

/* ── Page wrapper ───────────────────────────────────────────────────────── */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 56px;
}

.hero-label {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 700;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
  color: var(--black);
}

.hero-tagline {
  font-size: 1.3rem;
  color: var(--grey);
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.65;
  font-weight: 500;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.btn-dark {
  background: var(--black);
  color: var(--white);
}
.btn-dark:hover { background: #333; color: var(--white); }

.btn-outline {
  background: transparent;
  color: var(--black);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--black); color: var(--black); }

/* ── Section headings ───────────────────────────────────────────────────── */
.section-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
  font-weight: 700;
}

/* ── About ──────────────────────────────────────────────────────────────── */
.about {
  margin-bottom: 64px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border);
}

.about p {
  font-size: 1rem;
  color: #333;
  margin-bottom: 16px;
  max-width: 620px;
}
.about p:last-child { margin-bottom: 0; }

/* ── Projects ───────────────────────────────────────────────────────────── */
.projects { margin-bottom: 64px; }

.project-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 32px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
  margin-bottom: 16px;
  background: var(--white);
}
.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(99,102,241,0.08);
  color: inherit;
}

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

.project-title {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--black);
}

.project-tag {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--accent-light);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--grey);
  line-height: 1.6;
  margin-bottom: 14px;
}

.project-links {
  display: flex;
  gap: 16px;
}

.project-link {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.project-link:hover { text-decoration: underline; color: var(--accent); }
.project-link.secondary { color: var(--grey); }
.project-link.secondary:hover { color: var(--black); }

/* ── Footer ─────────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 13px;
  color: var(--grey);
}

.footer-inner a { color: var(--grey); text-decoration: none; }
.footer-inner a:hover { color: var(--black); }

/* ── Project page ───────────────────────────────────────────────────────── */
.project-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 13px;
  color: var(--grey);
  text-decoration: none;
  margin-bottom: 32px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--black); }

.project-hero h1 {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.6px;
  margin-bottom: 20px;
  line-height: 1.15;
}

.project-hero-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.meta-tag {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--accent-light);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
}

.meta-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--grey);
}

.project-hero-desc {
  font-size: 1.05rem;
  color: var(--grey);
  max-width: 580px;
  line-height: 1.65;
  margin-bottom: 28px;
}

/* ── Content cards ──────────────────────────────────────────────────────── */
.cards { display: flex; flex-direction: column; gap: 20px; }

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  background: var(--white);
}

.card-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.card h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.2px;
  color: var(--black);
}

.card p {
  font-size: 0.95rem;
  color: #333;
  line-height: 1.75;
  margin-bottom: 14px;
}
.card p:last-child { margin-bottom: 0; }

.card ul {
  margin: 12px 0 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.card ul li {
  font-size: 0.95rem;
  color: #333;
  line-height: 1.6;
}

.card-highlight {
  background: var(--light);
  border-color: var(--border);
}

.card-accent {
  background: var(--accent-light);
  border-color: #c7d2fe;
}

.flow {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0;
}

.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9rem;
  color: #333;
}

.flow-num {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--accent);
  color: var(--white);
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.flow-arrow {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--grey);
  padding-left: 34px;
  margin-top: -4px;
  margin-bottom: 2px;
}

.credit-name {
  font-weight: bold;
  color: var(--black);
}

/* ── Model card table ───────────────────────────────────────────────────── */
.model-card-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 4px;
}

.model-card-table tr {
  border-bottom: 1px solid var(--border);
}
.model-card-table tr:last-child {
  border-bottom: none;
}

.model-card-table td {
  padding: 10px 0;
  vertical-align: top;
  line-height: 1.65;
  color: #333;
}

.mc-key {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grey);
  white-space: nowrap;
  padding-right: 24px;
  padding-top: 10px;
  width: 1%;
  vertical-align: top;
}

/* ── Collapsible cards ──────────────────────────────────────────────────── */
.collapsible-card { padding: 0; overflow: hidden; }

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 22px 32px;
  user-select: none;
  transition: background 0.15s;
}
.collapsible-card:hover .card-header { background: rgba(0,0,0,0.02); }
.card-accent .card-header:hover { background: rgba(0,0,0,0.03); }
.card-highlight .card-header:hover { background: rgba(0,0,0,0.03); }

.card-header .card-label { margin-bottom: 0; }

.card-arrow {
  font-size: 10px;
  color: var(--grey);
  transition: transform 0.2s;
  flex-shrink: 0;
  margin-left: 16px;
}
.card-arrow.open { transform: rotate(180deg); }

.card-body {
  display: none;
  padding: 0 32px 28px;
}
.card-body.open { display: block; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  .project-hero h1 { font-size: 1.5rem; }
  .card { padding: 22px; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}