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

:root {
  --bg: #ffffff;
  --text: #111111;
  --text-body: #374151;
  --text-soft: #4b5563;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --border: #e5e7eb;
  --card-bg: #f9fafb;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --badge-bg: #eff6ff;
  --badge-border: #bfdbfe;
  --email-card-bg: #f4f8ff;
  --email-card-border: #c7dbff;
  --email-card-hover: #93c5fd;
  --email-icon-bg: #dbeafe;
  --email-icon-text: #1e40af;
  --max-w: 720px;
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e5e7eb;
  --text-body: #d1d5db;
  --text-soft: #9ca3af;
  --muted: #9ca3af;
  --accent: #60a5fa;
  --accent-strong: #93c5fd;
  --border: #1f2937;
  --card-bg: #111827;
  --nav-bg: rgba(11, 18, 32, 0.92);
  --badge-bg: #172554;
  --badge-border: #1d4ed8;
  --email-card-bg: #0f172a;
  --email-card-border: #1e3a8a;
  --email-card-hover: #2563eb;
  --email-icon-bg: #1e3a8a;
  --email-icon-text: #bfdbfe;
}

html:not([data-theme]) {
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --bg: #0b1220;
    --text: #e5e7eb;
    --text-body: #d1d5db;
    --text-soft: #9ca3af;
    --muted: #9ca3af;
    --accent: #60a5fa;
    --accent-strong: #93c5fd;
    --border: #1f2937;
    --card-bg: #111827;
    --nav-bg: rgba(11, 18, 32, 0.92);
    --badge-bg: #172554;
    --badge-border: #1d4ed8;
    --email-card-bg: #0f172a;
    --email-card-border: #1e3a8a;
    --email-card-hover: #2563eb;
    --email-icon-bg: #1e3a8a;
    --email-icon-text: #bfdbfe;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 56px;
  z-index: 100;
}

.nav-name {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.15s;
}

nav a:hover {
  color: var(--text);
}

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

section {
  padding: 5rem 0;
}

section + section {
  border-top: 1px solid var(--border);
}

h2 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
}

/* ── Hero ── */
#hero {
  padding-top: 6rem;
  padding-bottom: 5rem;
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 480px;
}

/* ── About ── */
.about-body p {
  color: var(--text-body);
  max-width: 60ch;
}

.about-body p + p {
  margin-top: 1rem;
}

/* ── Projects ── */
.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 560px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.project-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.badge {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-soft);
  flex: 1;
}

.project-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  align-self: flex-start;
}

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

.project-link.muted {
  color: var(--muted);
  cursor: default;
}

/* Contact page */
.contact-intro {
  color: var(--text-soft);
  max-width: 62ch;
  margin-bottom: 1.25rem;
}

.contact-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.75fr) minmax(250px, 1fr);
  gap: 1rem;
  align-items: start;
}

.contact-primary {
  display: grid;
  gap: 1rem;
}

.email-hero-card {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: 0.9rem;
  background: var(--email-card-bg);
  border: 1px solid var(--email-card-border);
  border-radius: 12px;
  padding: 1rem 1.05rem;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.email-hero-card:hover {
  border-color: var(--email-card-hover);
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.12);
  transform: translateY(-1px);
}

.email-icon {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--email-icon-text);
  background: var(--email-icon-bg);
}

.email-hero-content {
  display: grid;
  gap: 0.2rem;
}

.email-label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #6b7280;
}

.email-address {
  font-size: clamp(1.2rem, 3.6vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  word-break: break-word;
}

.email-cta {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-strong);
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.profile-card,
.metadata-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.15rem;
}

.profile-card h3,
.metadata-card h3 {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.65rem;
}

.profile-card p {
  color: var(--text-soft);
  font-size: 0.92rem;
  margin-bottom: 0.6rem;
}

.profile-card a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}

.profile-card a:hover {
  text-decoration: underline;
}

.metadata-list {
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.metadata-list li {
  color: var(--text-body);
  font-size: 0.92rem;
}

.theme-switcher {
  position: relative;
  display: inline-flex;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-glyph {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  border: 1.5px solid var(--text);
  background: linear-gradient(90deg, var(--text) 50%, transparent 50%);
}

.theme-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 120px;
  padding: 0.35rem;
  display: grid;
  gap: 0.2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
  z-index: 220;
}

.theme-menu[hidden] {
  display: none;
}

.theme-option {
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  padding: 0.38rem 0.5rem;
  font-size: 0.82rem;
  cursor: pointer;
}

.theme-option:hover {
  background: var(--email-card-bg);
}

.theme-option.is-active {
  background: var(--email-card-bg);
  color: var(--accent-strong);
  font-weight: 600;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.metadata-card {
  position: sticky;
  top: 84px;
}

@media (max-width: 740px) {
  .contact-main-grid,
  .profile-grid {
    grid-template-columns: 1fr;
  }

  .metadata-card {
    position: static;
  }
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.legal-links {
  margin-top: 0.5rem;
}

.legal-links a {
  color: var(--muted);
  text-decoration: none;
}

.legal-links a:hover {
  text-decoration: underline;
  color: var(--text);
}