/* ---------- Design tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f8;
  --fg: #14161a;
  --fg-muted: #565c66;
  --border: #e2e4e9;
  --accent: #2f6fed;
  --accent-fg: #ffffff;
  --card-bg: #ffffff;
  --shadow: 0 1px 2px rgba(20, 22, 26, 0.04), 0 8px 24px rgba(20, 22, 26, 0.04);
  --radius: 10px;
  --max-width: 960px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  --bg: #0f1115;
  --bg-alt: #14171d;
  --fg: #eef0f3;
  --fg-muted: #9aa1ac;
  --border: #262b33;
  --accent: #6d9bff;
  --accent-fg: #0f1115;
  --card-bg: #171a21;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --bg-alt: #14171d;
    --fg: #eef0f3;
    --fg-muted: #9aa1ac;
    --border: #262b33;
    --accent: #6d9bff;
    --accent-fg: #0f1115;
    --card-bg: #171a21;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* ---------- Reset-ish ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { line-height: 1.2; margin: 0; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 10px 16px;
  border-radius: 0 0 6px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  font-weight: 700;
  font-family: var(--mono);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.site-nav {
  display: flex;
  gap: 28px;
}
.site-nav a {
  font-size: 0.94rem;
  color: var(--fg-muted);
  transition: color 0.15s ease;
}
.site-nav a:hover { color: var(--fg); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.icon-btn {
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--fg);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s ease;
}
.btn:hover { opacity: 0.88; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-small { padding: 7px 14px; font-size: 0.85rem; }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 72px;
}
.eyebrow {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero-lede {
  margin-top: 20px;
  max-width: 620px;
  font-size: 1.1rem;
  color: var(--fg-muted);
}
.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 36px;
}
.section-num {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: start;
}
.about-text { color: var(--fg-muted); font-size: 1.02rem; margin: 0; }
.about-facts {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.about-facts li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border);
}
.about-facts li:last-child { border-bottom: none; }
.about-facts li span {
  font-family: var(--mono);
  color: var(--fg-muted);
  font-size: 0.82rem;
}

/* ---------- Projects ---------- */
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
}
.project-media {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.project-body { padding: 28px; }
.project-body h3 { font-size: 1.3rem; margin-bottom: 10px; }
.project-summary { color: var(--fg-muted); margin: 0 0 16px; }
.project-finding {
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 0 6px 6px 0;
  font-size: 0.96rem;
  margin: 0 0 16px;
}

.project-honesty {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 0 0 20px;
  font-size: 0.92rem;
}
.project-honesty summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--fg);
}
.project-honesty p {
  color: var(--fg-muted);
  margin: 12px 0 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.tag-list li {
  font-family: var(--mono);
  font-size: 0.78rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 6px;
  color: var(--fg-muted);
}

.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.project-grid-more {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.project-card-placeholder {
  border: 1px dashed var(--border);
  background: transparent;
  box-shadow: none;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
}
.placeholder-inner {
  text-align: center;
  padding: 24px;
  color: var(--fg-muted);
}
.placeholder-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 10px;
}
.placeholder-inner h3 { font-size: 1.05rem; color: var(--fg); margin-bottom: 6px; }
.placeholder-inner p { margin: 0; font-size: 0.9rem; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.skill-group h3 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: var(--fg-muted);
  font-weight: 600;
}

/* ---------- Contact ---------- */
.contact-lede { color: var(--fg-muted); margin: 0 0 28px; max-width: 520px; }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.contact-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
}
.contact-value { font-size: 0.95rem; font-weight: 600; word-break: break-word; }
.contact-card-disabled { opacity: 0.5; cursor: default; }
.contact-card-disabled:hover { border-color: var(--border); transform: none; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.site-footer p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.85rem;
}

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .project-body { padding: 32px; }
  .project-card { grid-template-columns: 340px 1fr; }
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .site-nav a:last-child { border-bottom: none; }
  .nav-toggle { display: inline-flex; }
  .project-grid-more { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .skills-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 56px; }
}