:root {
  --color-bg: #ffffff;
  --color-surface: #f4f6f5;
  --color-text: #1f2933;
  --color-text-muted: #52606d;
  --color-accent: #0f5c57;
  --color-accent-dark: #0b4541;
  --color-border: #e3e8e6;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1080px;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(31, 41, 51, 0.06);
  --shadow-md: 0 8px 24px rgba(31, 41, 51, 0.08);
}

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

html { scroll-behavior: smooth; }

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

img { max-width: 100%; display: block; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-dark); }

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

h1, h2, h3 { line-height: 1.25; font-weight: 700; }
h1 { font-size: 2.5rem; }
h2 { font-size: 1.9rem; margin-bottom: 16px; }
h3 { font-size: 1.3rem; margin-bottom: 8px; }
p { margin-bottom: 16px; color: var(--color-text-muted); }

/* Header / Nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo { font-weight: 700; font-size: 1.1rem; color: var(--color-text); }

.site-nav { display: flex; gap: 28px; }

.site-nav a { color: var(--color-text-muted); font-weight: 500; font-size: 0.95rem; }

.site-nav a.active,
.site-nav a:hover { color: var(--color-accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hero */
.hero { padding: 96px 0 64px; text-align: center; }

.hero-monogram {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  margin: 0 auto 32px;
}

.hero h1 { margin-bottom: 12px; }

.tagline { color: var(--color-accent); font-weight: 600; font-size: 1.1rem; margin-bottom: 20px; }

.hero-sub { max-width: 640px; margin: 0 auto 32px; font-size: 1.05rem; }

.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; }

.btn-outline { border-color: var(--color-accent); color: var(--color-accent); }
.btn-outline:hover { background: var(--color-accent); color: #fff; }

/* Stat strip */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stat { text-align: center; }
.stat .stat-number { font-size: 1.8rem; font-weight: 700; color: var(--color-accent); display: block; margin-bottom: 6px; }
.stat p { margin-bottom: 0; font-size: 0.95rem; }

/* Section spacing */
.section { padding: 72px 0; }
.section-surface { background: var(--color-surface); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

/* Timeline (Experience page) */
.timeline { display: flex; flex-direction: column; gap: 40px; }

.timeline-item { border-left: 3px solid var(--color-accent); padding-left: 24px; position: relative; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-accent);
}

.timeline-role { font-size: 1.2rem; font-weight: 700; margin-bottom: 2px; }
.timeline-meta { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 12px; }
.timeline-item ul { padding-left: 20px; }
.timeline-item li { margin-bottom: 8px; color: var(--color-text-muted); }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 32px; }

.skills-grid li {
  list-style: none;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.tag-list { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.88rem;
  color: var(--color-text);
}

/* Blog list */
.post-list { display: flex; flex-direction: column; gap: 24px; }
.post-card { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 28px; }
.post-meta { color: var(--color-text-muted); font-size: 0.85rem; margin-bottom: 8px; }

/* Blog post article */
.article { max-width: 720px; margin: 0 auto; }
.article h1 { margin-bottom: 8px; }
.article .post-meta { margin-bottom: 32px; }
.article p { color: var(--color-text); font-size: 1.05rem; }
.back-link { display: inline-block; margin-bottom: 32px; font-weight: 600; }

/* Contact form */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.form-group textarea { min-height: 140px; resize: vertical; }

.contact-side .card { margin-bottom: 16px; }

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); padding: 32px 0; margin-top: 48px; }

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-links { display: flex; gap: 20px; }

/* Fade-in animation */
.fade-in { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    display: none;
  }
  .site-nav.open { display: flex; }
  .contact-grid { grid-template-columns: 1fr; }
  .stat-strip { grid-template-columns: 1fr; gap: 32px; }
  h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .hero { padding: 64px 0 40px; }
  .section { padding: 48px 0; }
}