/* base.css — Reset + global styles + state patterns + nav styles + reduced motion. Loaded after tokens.css. */


/* --- RESET (minimal, no normalize.css dep — modern browsers have converged) --- */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--surface-base);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}


/* --- SKIP NAVIGATION (a11y) --- */

.skip-nav {
  position: absolute;
  /* Visually hidden via clip pattern — axe ignores clipped elements (avoids false-positive contrast violations) */
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  left: 0;
  top: 0;
  z-index: var(--z-toast);
  text-decoration: none;
}

.skip-nav:focus {
  /* Reveal when focused via keyboard */
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
  padding: var(--sp-2) var(--sp-4);
  background: var(--accent);
  color: var(--text-primary);
  border-radius: 0 0 var(--radius-md) 0;
}


/* --- STATE PATTERNS (D-09) --- */

/* Loading state: .qr-loading */
.qr-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--sp-8);
  color: var(--text-secondary);
  text-align: center;
}

.qr-loading__icon {
  width: 40px;
  height: 40px;
  border: 3px solid var(--surface-2);
  border-top-color: var(--accent);
  border-radius: var(--radius-full);
  animation: qr-spin var(--duration-slow) linear infinite;
}

@keyframes qr-spin {
  to { transform: rotate(360deg); }
}


/* Empty state: .qr-empty */
.qr-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  padding: var(--sp-8);
  color: var(--text-secondary);
  text-align: center;
}

.qr-empty__icon {
  font-size: 2.5rem;
  opacity: 0.5;
}

.qr-empty__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.qr-empty__message {
  font-size: var(--text-sm);
  max-width: 40ch;
}

.qr-empty__action {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-5);
  background: var(--accent);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: background var(--duration-fast) ease;
  min-height: 44px;
}

.qr-empty__action:hover {
  background: var(--accent-hover);
}


/* Error state: .qr-error */
.qr-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-6);
  background: rgba(255, 100, 100, 0.08);
  border: 1px solid rgba(255, 100, 100, 0.2);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  text-align: center;
}

.qr-error__icon {
  font-size: 1.5rem;
  color: var(--color-error);
}

.qr-error__message {
  font-size: var(--text-sm);
}

.qr-error__retry {
  padding: var(--sp-2) var(--sp-4);
  background: rgba(255, 100, 100, 0.15);
  border: 1px solid rgba(255, 100, 100, 0.3);
  border-radius: var(--radius-md);
  color: #ff9090;
  cursor: pointer;
  font-size: var(--text-sm);
  min-height: 44px;
}

.qr-error__retry:hover {
  background: rgba(255, 100, 100, 0.25);
}


/* --- NAV COMPONENT STYLES --- */

.qr-nav {
  display: flex;
  flex-direction: row;
  align-items: center;
  padding: var(--sp-3) var(--sp-6);
  background: var(--surface-0);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
}

.qr-nav__brand {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--text-primary);
  text-decoration: none;
}

.qr-nav__links {
  display: flex;
  list-style: none;
  gap: var(--sp-1);
  margin-left: var(--sp-6);
}

.qr-nav__link {
  padding: var(--sp-2) var(--sp-3);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color var(--duration-fast) ease, background var(--duration-fast) ease;
}

.qr-nav__link:hover {
  color: var(--text-primary);
  background: var(--surface-1);
}

.qr-nav__link.active {
  color: var(--accent-text);
  background: var(--surface-2);
}

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

.qr-nav__end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.qr-nav__credits {
  color: var(--text-muted);
  font-size: var(--text-xs);
}

.qr-nav__user {
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

.qr-nav__hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--sp-2);
  border-radius: var(--radius-md);
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  margin-left: auto;
}

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


/* --- GLOBAL FOCUS INDICATORS (A11Y-01, D-18, D-19) --- */

/* Global fallback focus ring -- any element keyboard-focused that does not define its own */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Suppress outline on mouse/touch activation -- keyboard-only via :focus-visible */
:focus:not(:focus-visible) {
  outline: none;
}


@media (max-width: 768px) {
  .qr-nav {
    flex-wrap: wrap;
  }

  .qr-nav__hamburger {
    display: inline-flex;
  }

  .qr-nav__links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: var(--sp-1);
    margin-left: 0;
    padding: var(--sp-2) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }

  .qr-nav__links--open {
    display: flex;
  }

  .qr-nav__end {
    order: 3;
    width: 100%;
    padding: var(--sp-2) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }
}


/* --- PREFERS-REDUCED-MOTION (D-17, A11Y-04) --- */
/* Use 1ms NOT 0s: 0s prevents animationend/transitionend events from firing, breaking JS-driven state.  */
/* Source: web.dev/articles/prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-delay: -1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    background-attachment: initial !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    transition-delay: -1ms !important;
  }
}