/* ---------- Tokens ---------- */
:root {
  --bg: #faf9f7;
  --bg-elevated: #ffffff;
  --text: #16151a;
  --text-muted: #57565f;
  --border: #e6e4e0;
  --accent: #ff5a3c;
  --accent-text: #ffffff;
  --card-bg: #ffffff;
  --shadow: 0 1px 2px rgba(22,21,26,0.04), 0 8px 24px rgba(22,21,26,0.06);
  --radius: 14px;
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

:root[data-theme="dark"] {
  --bg: #121114;
  --bg-elevated: #1a191d;
  --text: #f3f2ef;
  --text-muted: #a5a3ab;
  --border: #2b2a2f;
  --accent: #ff6a4d;
  --accent-text: #16151a;
  --card-bg: #1a191d;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px rgba(0,0,0,0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121114;
    --bg-elevated: #1a191d;
    --text: #f3f2ef;
    --text-muted: #a5a3ab;
    --border: #2b2a2f;
    --accent: #ff6a4d;
    --accent-text: #16151a;
    --card-bg: #1a191d;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px rgba(0,0,0,0.35);
  }
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}
h1, h2, h3 { font-family: var(--font-display); margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding-inline: 24px;
}

.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 18px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle {
  display: grid;
  place-items: center;
  height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ---------- Hero ---------- */
.hero {
  padding-block: 120px 96px;
  max-width: 760px;
}
.eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.05;
}
.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-muted);
  margin-top: 14px;
}
.hero-text {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 56ch;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

/* ---------- Section shared ---------- */
section { padding-block: 96px; }
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}
.section-num {
  font-family: var(--font-display);
  color: var(--accent);
  font-weight: 600;
}
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }

/* ---------- About ---------- */
.about-photo {
  margin: 0 0 40px;
}
.about-photo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.about-photo figcaption {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.about-photo .photo-einstein { object-position: center 70%; }

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 60ch;
}
.about-facts {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-left: 1px solid var(--border);
  padding-left: 24px;
}
.about-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.about-facts strong { font-size: 0.85rem; color: var(--text-muted); }
.about-facts span { font-weight: 600; }

/* ---------- Values ---------- */
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.value-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.value-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}
.value-icon svg { width: 20px; height: 20px; }
.value-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.value-card p { color: var(--text-muted); font-size: 0.92rem; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.skill-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.skill-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.skill-card p { color: var(--text-muted); font-size: 0.92rem; }

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.project-num {
  font-family: var(--font-display);
  color: var(--text-muted);
  font-weight: 600;
}
.project-card h3 { font-size: 1.15rem; }
.project-card p { color: var(--text-muted); font-size: 0.94rem; flex-grow: 1; }
.project-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.project-tags span {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.project-link {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.92rem;
  margin-top: 4px;
}
.project-featured {
  grid-column: 1 / -1;
  border-color: var(--accent);
}
.project-featured .project-num {
  display: flex;
  align-items: center;
  gap: 10px;
}
.project-badge {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
}
.project-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ---------- Contact ---------- */
.contact-content {
  text-align: center;
  max-width: 620px;
  margin: 0 auto;
}
.contact-lead {
  color: var(--text-muted);
  font-size: 1.1rem;
}
.social-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 28px;
}
.social-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}
.social-links a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: 28px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
}
.back-to-top { font-weight: 600; color: var(--text); }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: reveal 0.7s ease forwards;
}
.hero h1.reveal { animation-delay: 0.05s; }
.hero-role.reveal { animation-delay: 0.15s; }
.hero-text.reveal { animation-delay: 0.25s; }
.hero-actions.reveal { animation-delay: 0.35s; }
@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    gap: 18px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .hero { padding-block: 72px 64px; }
  .values-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; gap: 12px; text-align: center; }
}