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

:root {
  --ink: #111312;
  --ink-muted: #555f5c;
  --ink-faint: #a8b5b1;
  --bg: #f4f5f3;
  --bg-card: #f9faf8;
  --accent: #1a6b5a;
  --accent-mid: #2d8c78;
  --accent-light: #e0eeea;
  --border: #dde3e0;
  --mono: 'DM Mono', monospace;
  --serif: 'DM Serif Display', serif;
  --sans: 'Outfit', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.1rem 4rem;
  background: rgba(244, 245, 243, 0.93);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-logo { font-family: var(--mono); font-size: 12px; color: var(--ink-muted); letter-spacing: 0.04em; text-decoration: none; }
.nav-links { display: flex; gap: 2.5rem; list-style: none; }
.nav-links a { font-size: 13px; font-weight: 400; letter-spacing: 0.04em; color: var(--ink-muted); text-decoration: none; transition: color 0.2s; }
.nav-links a:hover { color: var(--accent); }

/* ── BUTTONS ── */
.btn-primary {
  display: inline-block; padding: 0.75rem 1.75rem;
  background: var(--accent); color: #fff;
  font-size: 14px; font-weight: 400; text-decoration: none; border-radius: 2px;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--accent-mid); }

.btn-secondary {
  display: inline-block; padding: 0.75rem 1.75rem;
  border: 1px solid var(--border); color: var(--ink-muted);
  font-size: 14px; font-weight: 400; text-decoration: none; border-radius: 2px;
  transition: border-color 0.2s, color 0.2s;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ── SHARED SECTION PARTS ── */
.section-label { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 0.75rem; }
.section-title { font-family: var(--serif); font-size: clamp(34px, 4vw, 54px); font-weight: 400; line-height: 1.1; margin-bottom: 3rem; }

/* ── FOOTER ── */
footer { padding: 1.75rem 4rem; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
footer p { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }

/* ── REVEAL ── */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── INDEX: HERO ── */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: flex-end; padding: 0 4rem 5rem; }
.hero-tag { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.1em; margin-bottom: 1.25rem; opacity: 0; animation: fadeUp 0.7s ease 0.2s forwards; }
.hero h1 { font-family: var(--serif); font-size: clamp(44px, 7vw, 92px); line-height: 1.05; font-weight: 400; max-width: 16ch; opacity: 0; animation: fadeUp 0.8s ease 0.35s forwards; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-sub { margin-top: 1.75rem; font-size: 16px; font-weight: 300; color: var(--ink-muted); max-width: 440px; line-height: 1.75; opacity: 0; animation: fadeUp 0.8s ease 0.5s forwards; }
.hero-actions { margin-top: 2.5rem; display: flex; gap: 0.875rem; opacity: 0; animation: fadeUp 0.8s ease 0.65s forwards; }

/* ── INDEX: ABOUT ── */
#about { display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: start; border-top: 1px solid var(--border); padding: 5.5rem 4rem; }
.about-text p { font-size: 16px; font-weight: 300; color: var(--ink-muted); margin-bottom: 1.1rem; }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem 1.5rem; padding-top: 3.5rem; }
.skill-category h4 { font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.6rem; }
.skill-category ul { list-style: none; }
.skill-category li { font-size: 13px; color: var(--ink-muted); padding: 0.25rem 0; border-bottom: 1px solid var(--border); }

/* ── INDEX: PROJECTS GRID ── */
#projects { border-top: 1px solid var(--border); padding: 5.5rem 4rem; }
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); }
.project-card { background: var(--bg-card); padding: 2rem 1.75rem; transition: background 0.2s; text-decoration: none; color: inherit; display: block; cursor: pointer; }
.project-card:hover { background: #fff; }
.project-card.featured { grid-column: span 2; }
.project-year { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); letter-spacing: 0.08em; margin-bottom: 1rem; display: flex; align-items: center; gap: 0.6rem; }
.project-year .tag { background: var(--accent-light); color: var(--accent); font-size: 10px; padding: 2px 7px; border-radius: 1px; font-weight: 500; letter-spacing: 0.05em; }
.project-card h3 { font-family: var(--serif); font-size: 22px; font-weight: 400; line-height: 1.2; margin-bottom: 0.85rem; }
.project-card.featured h3 { font-size: 28px; }
.project-card p { font-size: 14px; font-weight: 300; color: var(--ink-muted); line-height: 1.7; margin-bottom: 1.1rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.project-tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.05em; padding: 3px 8px; border: 1px solid var(--border); color: var(--ink-faint); border-radius: 1px; }
.card-cta { display: inline-block; margin-top: 1.25rem; font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.08em; }

/* ── INDEX: TIMELINE ── */
#experience { border-top: 1px solid var(--border); padding: 5.5rem 4rem; }
.timeline-item { display: grid; grid-template-columns: 160px 1fr; gap: 3rem; padding: 2rem 0; border-bottom: 1px solid var(--border); align-items: start; }
.timeline-date { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); padding-top: 0.2rem; }
.timeline-content h3 { font-size: 17px; font-weight: 500; margin-bottom: 0.2rem; }
.timeline-content .org { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.05em; margin-bottom: 0.6rem; }
.timeline-content p { font-size: 14px; font-weight: 300; color: var(--ink-muted); line-height: 1.7; }

/* ── INDEX: CONTACT ── */
#contact { border-top: 1px solid var(--border); padding: 5.5rem 4rem; display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: start; }
.contact-title { font-family: var(--serif); font-size: clamp(34px, 4vw, 54px); font-weight: 400; line-height: 1.1; margin-bottom: 1.25rem; }
.contact-title em { font-style: italic; color: var(--accent); }
.contact-left p { font-size: 15px; font-weight: 300; color: var(--ink-muted); max-width: 380px; }
.contact-links { display: flex; flex-direction: column; gap: 0.75rem; padding-top: 3.5rem; }
.contact-link { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem; border: 1px solid var(--border); border-radius: 2px; text-decoration: none; color: var(--ink); background: var(--bg-card); transition: border-color 0.2s; }
.contact-link:hover { border-color: var(--accent-mid); }
.contact-link-label { font-family: var(--mono); font-size: 10px; color: var(--ink-faint); letter-spacing: 0.1em; text-transform: uppercase; width: 64px; flex-shrink: 0; }
.contact-link-value { font-size: 14px; flex: 1; }
.contact-link-arrow { font-size: 13px; color: var(--ink-faint); }

/* ── PROJECT PAGE ── */
.project-hero { padding: 9rem 4rem 4rem; border-bottom: 1px solid var(--border); }
.back-link { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); text-decoration: none; letter-spacing: 0.06em; display: inline-flex; align-items: center; gap: 0.4rem; margin-bottom: 2.5rem; transition: color 0.2s; }
.back-link:hover { color: var(--accent); }
.project-hero-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1.25rem; }
.project-hero-year { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }
.project-hero-tag { background: var(--accent-light); color: var(--accent); font-family: var(--mono); font-size: 10px; padding: 3px 9px; border-radius: 1px; font-weight: 500; letter-spacing: 0.06em; }
.project-hero h1 { font-family: var(--serif); font-size: clamp(38px, 5vw, 72px); font-weight: 400; line-height: 1.05; max-width: 18ch; margin-bottom: 1.5rem; }
.project-hero-summary { font-size: 17px; font-weight: 300; color: var(--ink-muted); max-width: 640px; line-height: 1.8; margin-bottom: 2rem; }
.project-hero-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 2rem; }
.project-hero-actions { display: flex; gap: 0.875rem; flex-wrap: wrap; }

.project-body { padding: 4rem 4rem; max-width: 1200px; }

/* image layouts */
.img-full { width: 100%; border-radius: 3px; border: 1px solid var(--border); display: block; margin-bottom: 0.5rem; }
.img-caption { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); letter-spacing: 0.05em; margin-bottom: 2.5rem; }
.img-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 0.5rem; }
.img-grid-2 img { width: 100%; border-radius: 3px; border: 1px solid var(--border); display: block; }
.img-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; margin-bottom: 0.5rem; }
.img-grid-3 img { width: 100%; border-radius: 3px; border: 1px solid var(--border); display: block; }

/* placeholder image box */
.img-placeholder {
  width: 100%; background: var(--bg-card); border: 1px dashed var(--border);
  border-radius: 3px; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 0.5rem; color: var(--ink-faint);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  text-align: center; padding: 3rem 1rem;
}
.img-placeholder svg { opacity: 0.35; }

/* content blocks */
.project-section { margin-bottom: 3.5rem; }
.project-section h2 { font-family: var(--serif); font-size: 28px; font-weight: 400; margin-bottom: 1rem; }
.project-section p { font-size: 15px; font-weight: 300; color: var(--ink-muted); line-height: 1.8; margin-bottom: 0.9rem; max-width: 72ch; }
.project-section ul { list-style: none; margin-bottom: 0.9rem; display: flex; flex-direction: column; gap: 0.4rem; }
.project-section li { font-size: 15px; font-weight: 300; color: var(--ink-muted); padding-left: 1.25rem; position: relative; line-height: 1.7; }
.project-section li::before { content: '—'; position: absolute; left: 0; color: var(--ink-faint); font-size: 11px; top: 0.3rem; }

.specs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); margin-bottom: 2rem; }
.spec-item { background: var(--bg-card); padding: 1.25rem 1.5rem; }
.spec-label { font-family: var(--mono); font-size: 10px; color: var(--ink-faint); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 0.35rem; }
.spec-value { font-size: 15px; font-weight: 500; color: var(--ink); }

.divider { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }

/* ── RESPONSIVE ── */
@media (max-width: 960px) {
  nav { padding: 1rem 2rem; }
  #about, #contact { grid-template-columns: 1fr; gap: 3rem; padding: 4rem 2rem; }
  #projects, #experience { padding: 4rem 2rem; }
  .projects-grid { grid-template-columns: 1fr 1fr; }
  .project-card.featured { grid-column: span 2; }
  footer { padding: 1.5rem 2rem; }
  .skills-grid { padding-top: 0; }
  .project-hero { padding: 8rem 2rem 3rem; }
  .project-body { padding: 3rem 2rem; }
  .img-grid-3 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { display: none; }
  .hero { padding: 0 1.5rem 3.5rem; }
  #about, #projects, #experience, #contact { padding: 3.5rem 1.5rem; }
  .projects-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; }
  footer { flex-direction: column; gap: 0.4rem; text-align: center; padding: 1.5rem; }
  .img-grid-2, .img-grid-3 { grid-template-columns: 1fr; }
  .specs-grid { grid-template-columns: 1fr 1fr; }
  .project-hero { padding: 7rem 1.5rem 2.5rem; }
  .project-body { padding: 2.5rem 1.5rem; }
}