/* Shared components: nav, hero, buttons, footer.
   Design tokens live in tokens.css -- never hardcode a color or size here. */
/* ─── Nav ─────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}

.nav.scrolled {
  background: var(--bg-surface);
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  height: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--text-primary);
  margin-right: auto;
}

.nav__logo:hover { color: var(--accent); }

.nav__links {
  display: flex;
  list-style: none;
  gap: var(--space-6);
  padding: 0;
  margin: 0;
}

.nav__links a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__links a:hover,
.nav__links a.active { color: var(--text-primary); }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 640px) {
  .nav__hamburger { display: flex; }

  .nav__links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: var(--space-4) var(--space-6);
    gap: var(--space-4);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--duration-base) var(--ease-out),
                transform var(--duration-base) var(--ease-out);
  }

  .nav__links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
  }
}

/* ─── Theme Toggle ────────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

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

[data-theme="dark"]  .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }

/* ─── Hero ────────────────────────────────────────────────── */
.hero {
  padding: var(--space-24) 0 var(--space-16);
}

.hero--sm {
  padding: var(--space-16) 0 var(--space-8);
}

.hero__eyebrow {
  font-size: var(--text-sm);
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.hero__title { margin-bottom: var(--space-4); }

.hero__sub {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: var(--space-8);
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ─── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: 8px;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--on-accent);
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: var(--on-accent);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ─── Home Section Cards ──────────────────────────────────── */
.section-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  padding: var(--space-16) 0;
}

.section-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-8);
  text-decoration: none;
  display: block;
  transition: border-color var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out),
              background var(--duration-base) var(--ease-out);
}

.section-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  background: var(--bg-elevated);
}

.section-card__icon {
  font-size: 2rem;
  margin-bottom: var(--space-4);
}

.section-card__title {
  font-size: var(--text-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.section-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0;
}

/* ─── Empty State ─────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  border: 1px dashed var(--border);
  border-radius: 12px;
  margin-top: var(--space-8);
}

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

/* ─── Generic Page (About, etc.) ──────────────────────────── */
.page-content {
  max-width: 680px;
  padding: var(--space-16) 0;
}

.page-content h1 { margin-bottom: var(--space-6); }

.page-content h2 {
  font-size: var(--text-lg);
  margin: var(--space-8) 0 var(--space-4);
}

.page-content p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

/* ─── Footer ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
  margin-top: var(--space-16);
}

.footer p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-align: center;
  margin: 0;
}

/* ─── Divider ─────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-16) 0;
}

/* ─── Tag / Chip (shared by projects and albums) ─── */
.tag {
  font-size: var(--text-xs);
  padding: 2px var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-secondary);
}

/* ─── Accessibility utilities ─────────────────────────────── */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1100;
  padding: var(--space-3) var(--space-4);
  background: var(--accent);
  color: var(--on-accent);
  border-radius: 0 0 8px 0;
  transform: translateY(-120%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Available to screen readers, invisible on screen. */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Honor a user's reduced-motion preference across the whole site. */
@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;
  }
}

/* ─── Links inside prose ──────────────────────────────────── */
/* WCAG 1.4.1: a link sitting inside a block of text must be distinguishable
   by something other than color, otherwise it is invisible to a reader with
   colour-vision deficiency. Standalone links (nav, buttons, cards) are exempt
   because position and shape already identify them. */
.footer p a,
.page-content p a,
.page-content li a,
.project-body p a,
.project-body li a {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}