:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --text: #16202a;
  --text-muted: #57636f;
  --accent: #0284c7;
  --accent-soft: #e0f2fe;
  --border: #dde3e8;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(16, 24, 32, 0.08), 0 1px 2px rgba(16, 24, 32, 0.06);
  --link: #0284c7;
}

:root[data-theme="dark"] {
  --bg: #12181f;
  --bg-alt: #171f28;
  --text: #e6ebf0;
  --text-muted: #9aa8b4;
  --accent: #38bdf8;
  --accent-soft: #16303f;
  --border: #2a3540;
  --card-bg: #1a222b;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --link: #38bdf8;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12181f;
    --bg-alt: #171f28;
    --text: #e6ebf0;
    --text-muted: #9aa8b4;
    --accent: #38bdf8;
    --accent-soft: #16303f;
    --border: #2a3540;
    --card-bg: #1a222b;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --link: #38bdf8;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  transition: background 0.15s ease, color 0.15s ease;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Nav ---------- */
.site-nav {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

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

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.theme-toggle:hover { border-color: var(--accent); }

/* ---------- Homepage layout: sticky sidebar + content ---------- */
.layout {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
  padding: 2.5rem 0 3rem;
  margin-left: -1.25rem;
}

.sidebar {
  flex: 0 0 220px;
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 0.5rem;
}

.sidebar-avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  object-fit: cover;
}

.sidebar-name {
  margin: 0.9rem 0 0.15rem;
  font-size: 1.3rem;
  color: var(--text);
}

.sidebar-role {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
}

.sidebar-tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.sidebar-location {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0.6rem 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.sidebar-cv {
  margin-top: 1.1rem;
  width: 100%;
  justify-content: center;
}

.sidebar-links {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sidebar-links li a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.sidebar-links .icon {
  flex-shrink: 0;
}

.sidebar-links li a:hover {
  color: var(--text);
  background: var(--bg-alt);
  text-decoration: none;
}

.main-content {
  flex: 1;
  min-width: 0;
}

@media (max-width: 760px) {
  .layout {
    flex-direction: column;
    margin-left: 0;
  }
  .sidebar {
    position: static;
    flex: 1 1 auto;
    width: 100%;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-alt);
}
.btn:hover { text-decoration: none; border-color: var(--accent); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
:root[data-theme="dark"] .btn-primary,
@media (prefers-color-scheme: dark) { }
.btn-primary:hover { opacity: 0.9; }

.social-links {
  margin-top: 1.25rem;
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
}
.social-links a:hover { color: var(--text); text-decoration: none; border-color: var(--accent); }

.section {
  padding: 1.5rem 0;
}

.section h2 {
  font-size: 1.3rem;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.4rem;
  margin-bottom: 1rem;
}

.highlights {
  margin: 0;
  padding-left: 1.2rem;
}
.highlights li { margin-bottom: 0.4rem; }

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

.tag {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
}

/* ---------- Tools grid ---------- */
.page-header {
  padding: 2.5rem 0 1.5rem;
}
.page-header h1 { margin-bottom: 0.3rem; }
.page-header p { color: var(--text-muted); margin: 0; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  padding-bottom: 3rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

a.card {
  color: var(--text);
}
a.card:hover {
  text-decoration: none;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.6rem;
}

.card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  flex-grow: 1;
}

.card-footer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--link);
}

/* ---------- Project rows ---------- */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-bottom: 3rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.project-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.project-card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.project-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-style: italic;
}

.project-card p {
  margin: 0.4rem 0 0.8rem;
  color: var(--text-muted);
  text-align: justify;
}

.project-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
  font-weight: 600;
}

.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 600px) {
  .hero-top { flex-direction: column; text-align: center; }
  .hero-actions, .social-links { justify-content: center; }
  .nav-links { gap: 1rem; }
}