@import url('./tokens.css');

/* ── color-mix() fallbacks for older browsers ── */
/* Browsers without color-mix() support (Safari < 16.2, Chrome < 111)
   get solid backgrounds instead of transparency effects. */
@supports not (color: color-mix(in srgb, red 50%, blue)) {
  .hub-header {
    background: var(--color-surface);
  }
  .welcome-controls .theme-toggle,
  .welcome .theme-toggle {
    background: var(--color-surface);
  }
  .hub-link-card {
    border-bottom: 1px solid var(--color-border);
  }
  .welcome-link-card {
    border-bottom: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
  }
  .hub-footer,
  .welcome-footer {
    border-top: 1px solid var(--color-border);
  }
}

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

[hidden] {
  display: none !important;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-background);
}

/* ── Visually Hidden (screen reader only) ── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Skip Link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: var(--z-modal);
  background: var(--color-btn-fill);
  color: #FAF8F5;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* ══════════════════════════════════════════════════════
   SHARED HEADER — glassmorphism
   ══════════════════════════════════════════════════════ */
.hub-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  background: color-mix(in srgb, var(--color-background) 80%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 0.5px solid color-mix(in srgb, var(--color-border) 30%, transparent);
  min-height: 56px;
}

.hub-header .back-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 10px var(--space-sm);
  transition: color var(--transition-fast);
}

.hub-header .back-link:hover { color: var(--color-link); }
.hub-header .back-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  color: var(--color-link);
}

.hub-header .page-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hub-header .header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hub-header .header-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  min-height: 44px;
  padding: 10px var(--space-md);
  display: inline-flex;
  align-items: center;
  border: 0.5px solid color-mix(in srgb, var(--color-border) 60%, transparent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.hub-header .header-nav a:hover,
.hub-header .header-nav a:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-link);
}

.hub-header .header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

/* ── Mobile hamburger ── */
.hub-header .menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: var(--text-lg);
  width: 44px;
  height: 44px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  margin-left: auto;
}

.hub-header .menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.menu-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  margin: 4px auto;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

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

  .hub-header .page-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hub-header .menu-toggle { display: flex; }

  .hub-header .header-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 0.5px solid color-mix(in srgb, var(--color-border) 30%, transparent);
    margin-top: var(--space-sm);
  }

  .hub-header .header-nav.is-open { display: flex; }

  .hub-header .header-nav a {
    width: 100%;
    justify-content: center;
  }
}

/* ── Theme Toggle ── */
.theme-toggle {
  background: var(--color-surface);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  width: 44px;
  height: 44px;
  font-size: var(--text-base);
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Utility Layer ── */
.js-scroll .scroll-reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition:
    opacity 0.8s cubic-bezier(0.2, 0, 0, 1),
    transform 0.8s cubic-bezier(0.2, 0, 0, 1);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(1.5rem); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fade-up 0.8s cubic-bezier(0.2, 0, 0, 1) both;
}

/* ── 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-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .animate-in {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ── Forced Colors ── */
@media (forced-colors: active) {
  :focus-visible {
    outline: 2px solid LinkText !important;
    outline-offset: 2px;
  }

  .skip-link:focus {
    color: LinkText;
    background: Canvas;
    border: 2px solid LinkText;
  }

  .theme-toggle,
  .menu-toggle {
    border: 1px solid ButtonText !important;
  }

  a { color: LinkText; }
}

/* ── Footer ── */
.hub-footer {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  border-top: 0.5px solid color-mix(in srgb, var(--color-border) 30%, transparent);
}

.hub-footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.hub-footer a:hover { color: var(--color-link); }

.hub-footer a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  color: var(--color-link);
}