/*
  Base layout, components, and motion guards.
  See css/tokens.css for design tokens.
*/

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-mono);
  line-height: 1.25;
  margin: 0;
}

p {
  margin: 0;
  color: var(--text-secondary);
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- Skip link ---------- */

.skip-link {
  position: absolute;
  left: 0;
  top: -100%;
  background: var(--accent-blue);
  color: var(--bg);
  padding: var(--space-2xs) var(--space-sm);
  z-index: 100;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: 0;
}

/* ---------- Layout helpers ---------- */

.section-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
}

.section-heading {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.section-intro {
  max-width: 42rem;
  margin-bottom: var(--space-lg);
}

.category-title {
  font-size: var(--font-size-md);
  color: var(--accent-blue);
  margin-bottom: var(--space-sm);
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
}

.header-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent-blue);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-nav ul {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent-blue);
  text-decoration: none;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3xs);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  padding: var(--space-3xs) var(--space-xs);
  cursor: pointer;
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  border-color: var(--accent-blue);
}

.lang-option {
  opacity: 0.5;
}

.lang-option.is-active {
  opacity: 1;
  color: var(--accent-green);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.hero-text {
  min-width: 0;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent-green);
  font-size: var(--font-size-sm);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-sm);
}

.hero-name {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.hero-statement {
  max-width: 34rem;
  font-size: var(--font-size-md);
  color: var(--text-secondary);
}

.hero-photo-wrap {
  position: relative;
  flex: 0 0 auto;
  width: 240px;
  height: 240px;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--accent-blue-dim);
}

.hero-photo-fallback {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px solid var(--accent-blue-dim);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--font-size-xl);
  color: var(--accent-green);
}

.hero-photo-fallback[hidden] {
  display: none;
}

@media (max-width: 48rem) {
  .hero-inner {
    flex-direction: column-reverse;
    text-align: center;
    gap: var(--space-lg);
  }

  .hero-photo-wrap {
    width: 160px;
    height: 160px;
  }
}

.hero-circuit {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ---------- About narrative ---------- */

.narrative {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: var(--space-lg);
}

.narrative-step {
  border-left: 2px solid var(--accent-blue-dim);
  padding-left: var(--space-sm);
}

.narrative-index {
  display: block;
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-3xs);
}

.narrative-step h3 {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  margin-bottom: var(--space-2xs);
}

/* ---------- Portfolio ---------- */

.portfolio-category {
  margin-bottom: var(--space-xl);
}

.portfolio-category:last-child {
  margin-bottom: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: var(--space-md);
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.card h4 {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  margin-bottom: var(--space-2xs);
}

.card p {
  margin-bottom: var(--space-sm);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--accent-green);
  border: 1px solid var(--accent-green-dim);
  border-radius: var(--radius-sm);
  padding: var(--space-3xs) var(--space-xs);
}

.tag-link {
  text-decoration: none;
}

.tag-link:hover,
.tag-link:focus-visible {
  border-color: var(--accent-green);
  text-decoration: none;
}

/* ---------- Publications ---------- */

.publications-group {
  margin-bottom: var(--space-lg);
}

.publications-group:last-child {
  margin-bottom: 0;
}

.doc-link {
  display: inline-block;
  margin-top: var(--space-2xs);
}

.thesis-title {
  color: var(--text-primary);
  font-style: italic;
  margin-top: var(--space-sm);
}

.thesis-summary {
  max-width: 42rem;
  margin-top: var(--space-2xs);
  font-size: var(--font-size-sm);
}

.doc-list li {
  color: var(--text-secondary);
  padding: var(--space-3xs) 0;
  border-bottom: 1px solid var(--border);
}

.doc-list li:last-child {
  border-bottom: none;
}

.placeholder-note {
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  font-style: italic;
  color: var(--text-muted);
}

/* ---------- Technologies ---------- */

.tech-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: var(--space-lg);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
}

.chip {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3xs) var(--space-xs);
}

/* ---------- Experience timeline ---------- */

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.timeline-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  padding: var(--space-sm);
  border-left: 2px solid var(--accent-green-dim);
  background: var(--bg-elevated);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-sm);
}

.timeline-org {
  font-family: var(--font-mono);
  color: var(--accent-green);
  min-width: 9rem;
  font-weight: 600;
}

.timeline-role {
  color: var(--text-primary);
}

.timeline-period {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-left: auto;
}

.timeline-desc {
  max-width: 42rem;
  font-size: var(--font-size-sm);
}

/* ---------- Philosophy ---------- */

.section-philosophy {
  background: var(--bg-elevated);
}

.philosophy-quote {
  margin: 0;
  max-width: 42rem;
  font-size: var(--font-size-md);
  color: var(--text-primary);
  font-style: normal;
  border-left: 3px solid var(--accent-blue);
  padding-left: var(--space-md);
}

/* ---------- Contact ---------- */

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  font-family: var(--font-mono);
  font-size: var(--font-size-md);
}

/* ---------- Footer ---------- */

.site-footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

.site-footer p {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.footer-rights {
  margin-top: var(--space-3xs);
}

/* ---------- Responsive nav ---------- */

@media (max-width: 48rem) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md);
    gap: var(--space-md);
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav ul {
    flex-direction: column;
    gap: var(--space-sm);
    width: 100%;
  }

  .timeline-period {
    margin-left: 0;
  }
}

/* ---------- Motion guards ---------- */
/* Only `transform`/`opacity` are ever animated; GSAP-driven entrance
   animations in js/motion.js are skipped entirely when the user prefers
   reduced motion (handled in JS). This CSS layer additionally disables any
   CSS transitions for users who prefer reduced motion. */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}