/* Shared design tokens */
:root {
  --color-bg-page: #f0f2f5;
  --color-bg-card: #ffffff;
  --color-nav: #1e2228;
  --color-nav-hover: #353b45;
  --color-primary: #0d6efd;
  --color-primary-muted: rgba(13, 110, 253, 0.12);
  --color-text: #1c1e21;
  --color-text-muted: #5f6368;
  --shadow-nav: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-card: 0 4px 18px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --font-stack: 'Roboto', system-ui, -apple-system, Segoe UI, sans-serif;
  --max-content: 52rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-stack);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg-page);
}

main {
  flex: 1;
  padding: clamp(1.25rem, 4vw, 2rem) clamp(1rem, 4vw, 2rem) 3rem;
}

/* Skip link (keyboard / screen readers) */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  z-index: 1000;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
}

/* Navigation */
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 0;
  background-color: var(--color-nav);
  box-shadow: var(--shadow-nav);
}

.site-nav li {
  flex: 0 0 auto;
}

.site-nav a {
  display: block;
  color: #f0f2f5;
  padding: 0.875rem 1.1rem;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
  border-bottom: 3px solid transparent;
}

.site-nav a:hover:not(.active) {
  background-color: var(--color-nav-hover);
}

.site-nav a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.site-nav a.active {
  background-color: var(--color-primary);
  color: #fff;
  border-bottom-color: rgba(255, 255, 255, 0.35);
}

@media (max-width: 520px) {
  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav a {
    text-align: center;
    padding: 0.75rem 1rem;
  }
}

/* Page shell */
.container {
  margin-inline: auto;
  max-width: var(--max-content);
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--color-bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.container--narrow {
  max-width: 40rem;
}

/* Home hero */
.hero {
  text-align: center;
}

.hero__title {
  margin: 0 0 0.2rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

/* Developer / display name — smaller than the main h1 */
.hero__alias {
  margin: 0 0 1rem;
  font-size: clamp(0.9rem, 2.1vw, 1.05rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text-muted);
}

.hero__alias-name {
  font-weight: 600;
  color: var(--color-text);
}

.hero__subtitle {
  margin: 0 0 2rem;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  font-weight: 400;
  max-width: 36rem;
  margin-inline: auto;
}

.lede {
  text-align: left;
  margin: 0;
  font-size: 1.0625rem;
}

.lede + .lede {
  margin-top: 1rem;
}

.lede a {
  color: var(--color-primary);
}

.lede a:hover {
  text-decoration: underline;
}

/* Projects grid */
.project-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: clamp(1rem, 3vw, 1.35rem);
  text-align: left;
}

.project-grid > li {
  margin: 0;
}

.section-label {
  margin: 2rem 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.section-label:first-of-type {
  margin-top: 0;
}

.project-card {
  display: block;
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid #e4e7ec;
  background: var(--color-bg-card);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.18s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.project-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(13, 110, 253, 0.12);
  transform: translateY(-2px);
}

.project-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.project-card__title {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}

.project-card__meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* About page */
.about-intro {
  text-align: left;
  margin: 0 0 1rem;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.about-intro a {
  color: var(--color-primary);
  font-weight: 500;
}

.about-intro a:hover {
  text-decoration: underline;
}

.about-frame-wrap {
  margin-top: 0.75rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #e4e7ec;
  box-shadow: var(--shadow-card);
}

.about-frame-wrap iframe {
  display: block;
  width: 100%;
  height: min(78vh, 720px);
  border: none;
}

/* Contact */
.contact-lead {
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-width: 10.5rem;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius);
  border: 2px solid var(--color-primary);
  background: var(--color-bg-card);
  color: var(--color-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: background 0.2s ease, color 0.2s ease, transform 0.18s ease;
}

.contact-btn:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
}

.contact-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.contact-btn img {
  width: 28px;
  height: 28px;
}

.page-title {
  margin: 0 0 0.65rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
}

/* Footer */
.site-footer {
  padding: 1.25rem 1rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  background: #e8eaef;
  border-top: 1px solid #dde1e8;
}

.site-footer p {
  margin: 0;
}