/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:        #F7F6F1;
  --bg-alt:    #EDECEA;
  --card-bg:   #FFFFFF;
  --text:      #2C2C2C;
  --text-muted:#6B6B6B;
  --accent:    #6BAF85;
  --accent-dk: #4E9068;
  --border:    #DDDBD5;
  --radius:    8px;
  --max-w:     900px;
  --font:      'Inter', system-ui, -apple-system, sans-serif;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ── Layout helpers ────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}
section { padding: 5rem 0; }
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
h2.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: var(--text);
}

/* ── Nav ───────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 241, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }

/* hamburger (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ── Hero ──────────────────────────────────────────────────── */
#hero {
  padding: 6rem 0 5rem;
}
.hero-tag {
  display: inline-block;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent-dk);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}
#hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}
#hero h1 span { color: var(--accent); }
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 2rem;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dk); }
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── About ─────────────────────────────────────────────────── */
#about { background: var(--bg-alt); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}
.about-aside {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.about-avatar {
  width: 100%;
  max-width: 200px;
  aspect-ratio: 1;
  border-radius: var(--radius);
  object-fit: cover;
  object-position: center;
  border: 1px solid var(--border);
}
.about-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.about-links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.about-links a:hover { color: var(--accent); }
.about-links svg { flex-shrink: 0; }
.about-body p { color: var(--text-muted); margin-bottom: 1rem; }
.about-body p:last-child { margin-bottom: 0; }

/* ── Skills ────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
}
.skill-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.skill-card h3 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-dk);
  margin-bottom: 0.75rem;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tag {
  background: var(--bg-alt);
  color: var(--text);
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.tag.learning {
  border-style: dashed;
  color: var(--text-muted);
}

/* ── Projects ──────────────────────────────────────────────── */
#projects { background: var(--bg-alt); }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(390px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(107, 175, 133, 0.12);
}
.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}
.project-card-header h3 {
  font-size: 1rem;
  font-weight: 700;
}
.project-links {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}
.project-links a {
  color: var(--text-muted);
  transition: color 0.2s;
}
.project-links a:hover { color: var(--accent); }
.project-award {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-dk);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}
.project-award::before { content: "🏆"; font-size: 0.75rem; }

.project-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex: 1;
}
.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.project-stack .tag { font-size: 0.75rem; }

/* category label between project grids */
.projects-category {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* placeholder card */
.project-card.placeholder {
  border-style: dashed;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 180px;
  color: var(--text-muted);
  cursor: default;
}
.project-card.placeholder:hover {
  border-color: var(--border);
  box-shadow: none;
}
.project-card.placeholder p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── Contact ───────────────────────────────────────────────── */
.contact-inner {
  max-width: 560px;
}
.contact-inner p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ── Footer ────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-links { display: none; flex-direction: column; gap: 0; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
  }
  .nav-links.open a {
    padding: 0.75rem 1.5rem;
    display: block;
  }
  .nav-toggle { display: flex; }

  .about-grid { grid-template-columns: 1fr; }
  .about-avatar { max-width: 100px; font-size: 2.5rem; }
  .about-links { flex-direction: row; flex-wrap: wrap; }
}