/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --surface: #f4f6f9;
  --text: #1a1a2e;
  --text-muted: #5a6475;
  --accent: #0077b6;
  --accent-hover: #005f8e;
  --border: #e2e8f0;
  --font: 'Inter', system-ui, sans-serif;
  --radius: 8px;
  --max-w: 960px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

/* ─── Nav ─── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: box-shadow 0.2s;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

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

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

.nav-links a:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.25s;
}

/* ─── Container ─── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Sections ─── */
.section { padding: 5rem 0; }
.section-alt { background: var(--surface); }

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--accent);
  margin-top: 6px;
  border-radius: 2px;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: pointer;
  border: 2px solid transparent;
  font-family: var(--font);
}

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-full { width: 100%; justify-content: center; }

/* ─── Hero ─── */
.hero {
  padding: 9rem 0 5rem;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.hero-bio {
  max-width: 520px;
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-social { display: flex; gap: 1rem; }

.hero-social a {
  color: var(--text-muted);
  transition: color 0.2s;
  display: flex;
  align-items: center;
}

.hero-social a:hover { color: var(--accent); }

/* ─── About ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.skills-label {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.skills-label--top { margin-top: 1.5rem; }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.chip {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
}

.chip-cert {
  background: #e8f4fd;
  border-color: #b3d8f0;
  color: var(--accent);
}

/* ─── Projects ─── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.card-header { display: flex; flex-direction: column; gap: 0.4rem; }

.card-type {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tag {
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-weight: 500;
}

.card-link {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
}

.card-link:hover { text-decoration: underline; }

/* ─── Timeline ─── */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border: 3px solid var(--surface);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--border);
}

.timeline-date {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 700;
}

.timeline-company {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.timeline-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-content li {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding-left: 1rem;
  position: relative;
}

.timeline-content li::before {
  content: '\00B7';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.4;
}

/* ─── Education ─── */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.edu-icon-wrap {
  flex-shrink: 0;
  color: var(--accent);
  margin-top: 2px;
}

.edu-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.25rem; }
.edu-detail { color: var(--text); font-size: 0.9rem; }
.edu-sub { color: var(--text-muted); font-size: 0.82rem; margin-top: 0.15rem; }

/* ─── Contact ─── */
.contact-sub {
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 2.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.contact-form input,
.contact-form textarea {
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.2s;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.12);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 160px;
}

.contact-link-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.2s, color 0.2s;
  background: var(--bg);
  white-space: nowrap;
}

.contact-link-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.footer p { color: var(--text-muted); font-size: 0.85rem; }

/* ─── Mobile ─── */
@media (max-width: 700px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: 1rem;
  }

  .nav-links.open { display: flex; }

  .hero {
    padding: 7rem 0 4rem;
    min-height: auto;
  }

  .about-grid,
  .projects-grid,
  .edu-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .contact-links {
    flex-direction: row;
    flex-wrap: wrap;
  }
}