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

:root {
  --bg: #fafaf8;
  --bg-alt: #f2f1ed;
  --surface: #fff;
  --text: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --accent: #234e6e;
  --accent-hover: #1b3d56;
  --accent-light: #e8f0f5;
  --border: #e0ddd8;
  --border-light: #eae7e2;
  --radius: 8px;
  --font: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --max-w: 960px;
  --nav-h: 64px;
}

html { scroll-behavior: smooth; font-size: 17px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
strong { font-weight: 600; }

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

/* ===== NAVIGATION ===== */
#main-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
#main-nav.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 1px 8px rgba(0,0,0,0.04);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-h);
}
.nav-logo {
  font-family: var(--serif);
  font-size: 18px; font-weight: 700; color: var(--text);
  text-decoration: none;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  text-decoration: none; transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-cta {
  padding: 7px 18px !important;
  background: var(--accent) !important;
  color: #fff !important;
  border-radius: 6px;
  transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--accent-hover) !important; }

#nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
#nav-toggle span {
  display: block; width: 20px; height: 2px; background: var(--text);
  margin: 4px 0; transition: all 0.3s; border-radius: 1px;
}

/* ===== HERO ===== */
#hero {
  padding: calc(var(--nav-h) + 64px) 24px 80px;
  background: var(--bg);
}
.hero-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; gap: 56px;
}
.hero-photo {
  flex-shrink: 0;
}
.hero-photo img {
  width: 220px; height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--border-light);
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}
.hero-text { flex: 1; }
.hero-text h1 {
  font-family: var(--serif);
  font-size: 2.6rem; font-weight: 700;
  line-height: 1.2; margin-bottom: 16px;
  letter-spacing: -0.5px;
  color: var(--text);
}
.hero-lead {
  font-size: 1.1rem; line-height: 1.75;
  color: var(--text-secondary); margin-bottom: 12px;
}
.hero-lead strong { color: var(--text); }
.hero-note {
  font-size: 0.85rem; color: var(--text-muted);
  margin-bottom: 28px;
}
.hero-actions { display: flex; gap: 12px; }

.btn {
  display: inline-flex; align-items: center;
  padding: 12px 24px; border-radius: 6px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; border: none; text-decoration: none;
}
.btn--primary {
  background: var(--accent); color: #fff;
}
.btn--primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn--ghost {
  background: transparent; color: var(--accent);
  border: 1px solid var(--border);
}
.btn--ghost:hover { border-color: var(--accent); background: var(--accent-light); text-decoration: none; }

/* ===== SECTIONS COMMON ===== */
section { padding: 80px 0; }
section:nth-child(odd) { background: var(--bg); }
section:nth-child(even) { background: var(--bg-alt); }

section h2 {
  font-family: var(--serif);
  font-size: 1.8rem; font-weight: 700;
  margin-bottom: 12px; letter-spacing: -0.3px;
}
.section-intro {
  color: var(--text-secondary); font-size: 1rem;
  margin-bottom: 40px; max-width: 640px;
}

/* ===== ABOUT ===== */
.about-content {
  display: grid; grid-template-columns: 1fr 260px; gap: 48px;
  margin-top: 32px;
}
.about-main p {
  color: var(--text-secondary); margin-bottom: 16px;
  font-size: 0.95rem;
}
.about-main strong { color: var(--text); }
.about-aside {
  border-left: 2px solid var(--border);
  padding-left: 24px;
}
.aside-block { margin-bottom: 28px; }
.aside-block h3 {
  font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--text-muted); margin-bottom: 10px;
}
.aside-block ul li {
  font-size: 0.9rem; padding: 4px 0;
  display: flex; align-items: center; justify-content: space-between;
}
.aside-block p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; }
.tag {
  font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--accent); background: var(--accent-light);
  padding: 2px 8px; border-radius: 4px;
}
.muted { color: var(--text-muted); font-size: 0.85rem; }

/* ===== SERVICES ===== */
.services-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
.service-item {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 32px;
  transition: box-shadow 0.25s, border-color 0.25s;
}
.service-item:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  border-color: var(--border);
}
.service-item--highlight {
  border-left: 3px solid var(--accent);
}
.service-number {
  font-size: 0.75rem; font-weight: 700;
  color: var(--accent); margin-bottom: 12px;
  letter-spacing: 1px;
}
.service-item h3 {
  font-size: 1.1rem; font-weight: 700;
  margin-bottom: 10px;
}
.service-item p {
  font-size: 0.9rem; color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 16px;
}
.service-tools {
  font-size: 0.8rem; color: var(--text-muted);
  padding-top: 12px; border-top: 1px solid var(--border-light);
}

/* ===== EXPERIENCE ===== */
.exp-list { margin-top: 8px; }
.exp-item {
  display: grid; grid-template-columns: 140px 1fr; gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
}
.exp-item:last-child { border-bottom: none; }
.exp-period {
  font-size: 0.82rem; color: var(--text-muted);
  font-weight: 500; padding-top: 2px;
  white-space: nowrap;
}
.exp-body h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.exp-body p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; }

/* ===== CREDENTIALS ===== */
.certs-list {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-bottom: 48px;
}
.cert-item {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex; flex-direction: column; gap: 2px;
}
.cert-item strong { font-size: 0.9rem; }
.cert-item span { font-size: 0.8rem; color: var(--text-muted); }

.skills-title {
  font-family: var(--serif);
  font-size: 1.3rem; font-weight: 600;
  margin-bottom: 24px;
}
.skills-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.skill-group h4 {
  font-size: 0.75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--text-muted); margin-bottom: 10px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.skill-tags span {
  padding: 5px 12px; border-radius: 5px;
  font-size: 0.8rem; font-weight: 500;
  background: var(--surface); border: 1px solid var(--border-light);
  color: var(--text-secondary);
}

/* ===== CONTACT ===== */
#contact { text-align: center; }
#contact h2 { margin-bottom: 8px; }
#contact .section-intro { margin: 0 auto 40px; }
.contact-row {
  display: flex; gap: 16px; justify-content: center;
  flex-wrap: wrap; margin-bottom: 24px;
}
.contact-block {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  text-decoration: none; color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.contact-block:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  text-decoration: none;
}
.contact-block svg { color: var(--accent); flex-shrink: 0; }
.contact-block strong { font-size: 0.9rem; }
.contact-location {
  font-size: 0.85rem; color: var(--text-muted);
}

/* ===== FOOTER ===== */
#footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  background: var(--bg);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.8rem; color: var(--text-muted);
}
.footer-inner a { color: var(--text-muted); }
.footer-inner a:hover { color: var(--accent); }
.footer-links { display: flex; gap: 8px; align-items: center; }
.footer-sep { color: var(--border); }

/* ===== ANIMATIONS ===== */
.fade-up {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  html { font-size: 16px; }
  .hero-inner { flex-direction: column; text-align: center; gap: 32px; }
  .hero-photo img { width: 160px; height: 160px; }
  .hero-text h1 { font-size: 2rem; }
  .hero-actions { justify-content: center; }
  .about-content { grid-template-columns: 1fr; }
  .about-aside { border-left: none; border-top: 2px solid var(--border); padding-left: 0; padding-top: 24px; }
  .services-grid { grid-template-columns: 1fr; }
  .exp-item { grid-template-columns: 1fr; gap: 4px; }
  .exp-period { font-size: 0.78rem; }
  .certs-list { grid-template-columns: 1fr; }
  .skills-row { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 16px 24px; gap: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  }
  #nav-toggle { display: block; }
  section { padding: 56px 0; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}