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

:root {
  --green: #2d6a4f;
  --green-light: #52b788;
  --green-pale: #d8f3dc;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --border: #e5e7eb;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

/* NAV */
header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

nav {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--green);
  letter-spacing: 0.05em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--green);
}

/* HERO */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 60%);
}

.hero-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.hero-tag {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--green-light);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.btn {
  display: inline-block;
  background: var(--green);
  color: #fff;
  padding: 0.8rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.15s;
}

.btn:hover {
  background: #1b4332;
  transform: translateY(-1px);
}

/* SECTIONS */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

h2 {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-sub {
  color: var(--text-muted);
  margin-bottom: 3rem;
}

/* ABOUT */
.about {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about p {
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 1rem;
  font-size: 1rem;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.skills span {
  background: var(--green-pale);
  color: var(--green);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}

.card:hover {
  border-color: var(--green-light);
  box-shadow: 0 4px 20px rgba(45, 106, 79, 0.1);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* CONTACT */
.contact {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
}

.contact p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.contact-links a {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border: 1.5px solid var(--green);
  color: var(--green);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: background 0.2s, color 0.2s;
}

.contact-links a:hover {
  background: var(--green);
  color: #fff;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* SUBPAGE */
.page-hero {
  padding: 4rem 2rem 2rem;
  background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 60%);
  border-bottom: 1px solid var(--border);
}

.page-hero .back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}

.page-hero .back:hover {
  color: var(--green);
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.page-hero p {
  color: var(--text-muted);
  max-width: 600px;
  font-size: 1rem;
}

.page-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.87rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.tag {
  display: inline-block;
  background: var(--green-pale);
  color: var(--green);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

/* RESPONSIVE */
@media (max-width: 600px) {
  nav ul {
    gap: 1rem;
  }

  .hero {
    min-height: 80vh;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}