/* ============================================
   Tokens
   ============================================ */
:root {
  --bg: #FAFAF8;
  --surface: #FFFFFF;
  --ink: #14171A;
  --ink-soft: #5C6167;
  --line: #E6E4DF;
  --accent: #6D28D9;      /* purple — nod to "purple sector" fastest-time highlight */
  --accent-soft: #EFE9FB;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-w: 780px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ============================================
   Nav
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 6vw;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 14px;
  text-decoration: none;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

.nav-links a:hover { color: var(--ink); }

/* ============================================
   Hero
   ============================================ */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14vh 6vw 10vh;
  text-align: left;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin: 0 0 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--ink-soft);
  max-width: 520px;
  margin: 0 0 40px;
}

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

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--bg);
}
.btn-primary:hover { background: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--ink); }

/* ============================================
   Trace divider (signature element)
   ============================================ */
.trace-divider {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 6vw;
  line-height: 0;
}

.trace-divider svg {
  width: 100%;
  height: 60px;
  display: block;
}

.trace-path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.trace-peak {
  fill: var(--accent);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 9vh 6vw;
}

.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-inner-narrow {
  max-width: 560px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin: 0 0 16px;
  letter-spacing: 0.03em;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  max-width: 620px;
}

.section-text {
  color: var(--ink-soft);
  font-size: 1rem;
  max-width: 620px;
  margin: 0 0 18px;
}

.plain-list {
  color: var(--ink-soft);
  padding-left: 20px;
  margin: 0 0 20px;
}

.plain-list li { margin-bottom: 8px; }

/* ============================================
   Projects
   ============================================ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

@media (max-width: 720px) {
  .project-grid { grid-template-columns: 1fr; }
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 12px;
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 12px;
}

.project-text {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin: 0 0 20px;
}

.project-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.project-meta span {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
}

.project-link {
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

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

/* ============================================
   Contact
   ============================================ */
.contact-links {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.contact-links a {
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.contact-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: 40px 6vw 60px;
}

.footer p {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
}