:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #111418;
  --text-muted: #5a6470;
  --border: #e1e4e8;
  --accent: #1f6feb;
  --accent-strong: #1a5fd1;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1318;
  --surface: #151a21;
  --text: #e6edf3;
  --text-muted: #9aa4b2;
  --border: #273040;
  --accent: #7cc4ff;
  --accent-strong: #5ab0ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 8px;
}

.container {
  width: min(1100px, 100% - 3rem);
  margin: 0 auto;
}

.section {
  padding: 4.5rem 0;
}

.hero {
  padding: 3.5rem 0 4.5rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  align-items: center;
}

.nav a {
  position: relative;
  padding-bottom: 0.2rem;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s ease;
}

.nav a:focus-visible::after,
.nav a:hover::after {
  width: 100%;
}

.theme-toggle {
  margin-left: auto;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hero-content {
  margin-top: 3rem;
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.hero-content::after {
  content: "";
  display: block;
  width: min(320px, 80vw);
  aspect-ratio: 1;
  border-radius: 28px;
  background: linear-gradient(160deg, rgba(31, 111, 235, 0.2), transparent),
    url("../img/avatar-placeholder.png") center/cover,
    var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
  justify-self: start;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin: 0 0 1.5rem;
}

h3 {
  margin: 0 0 0.75rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin: 0 0 1.75rem;
  max-width: 38rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  background: var(--accent);
  color: #0b0f14;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(31, 111, 235, 0.2);
}

.button.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  border-color: var(--accent);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  background: var(--surface);
}

.project-grid {
  display: grid;
  gap: 1.5rem;
  grid-auto-rows: 1fr;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 100%;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.06);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  background: rgba(31, 111, 235, 0.12);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  border: 1px solid rgba(31, 111, 235, 0.3);
}

.status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.project-card p {
  color: var(--text-muted);
  margin: 0;
}

.project-links {
  margin-top: auto;
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  font-weight: 600;
  color: var(--accent);
}

.copy-email {
  margin-left: 0.75rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
}

.footer-year {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.about p,
.contact p {
  margin: 0;
  max-width: 44rem;
  color: var(--text-muted);
}

.contact a {
  color: var(--accent);
  font-weight: 600;
}

@media (min-width: 768px) {
  .hero-content {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }

  .hero-content::after {
    justify-self: end;
  }

  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .project-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .container {
    width: min(1100px, 100% - 2rem);
  }

  .nav {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .theme-toggle {
    margin-left: 0;
  }

  .button {
    width: 100%;
  }
}