@import url('https://fonts.googleapis.com/css2?family=Inter:wght@800;900&display=swap');

/* ============================================================
   Footer Brand Text – "FeeFeeNOON"
   Inspired by the Antigravity footer on antigravity.google
   ============================================================ */

.footer-brand-section {
  width: 100%;
  max-width: 100%;
  margin: 40px auto 10px auto;
  padding: 0 2vw;
  box-sizing: border-box;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.footer-brand-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.footer-brand-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 250px;
}

.footer-brand-text {
  font-family: 'Inter', 'Google Sans Flex', -apple-system, BlinkMacSystemFont,
    'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-weight: 800;
  font-size: 132px;
  letter-spacing: -0.04em;
  fill: var(--font-color, #111111);
  transition: fill 0.3s ease;
}

/* ============================================================
   AI Credit – Compact Inline Pills
   ============================================================ */

.powered-by-ai {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  width: 100%;
  margin-top: 6px;
  font-family: var(--fs-mono, monospace);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--fs-text-3);
  line-height: 1;
  text-align: center;
  user-select: none;
}

.ai-powered-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.62rem;
  opacity: 0.7;
}

.powered-by-ai .ai-model-headline {
  font-weight: 600;
  color: var(--fs-text-2);
  letter-spacing: 0.02em;
}

/* "+N more" / "收起" toggle */
.ai-models-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  padding: 0.2em 0.5em;
  border: 1px solid var(--fs-line);
  border-radius: 100px;
  background: transparent;
  color: var(--fs-text-3);
  font-family: var(--fs-mono, monospace);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s var(--fs-ease, ease);
  line-height: 1;
  white-space: nowrap;
}

.ai-models-toggle:hover,
.ai-models-toggle:focus-visible {
  background: var(--fs-text);
  color: var(--fs-bg);
  border-color: var(--fs-text);
}

.ai-models-toggle[aria-expanded="true"] {
  background: var(--fs-text);
  color: var(--fs-bg);
  border-color: var(--fs-text);
}

/* ============================================================
   Popover – Glassmorphic Compact Card
   ============================================================ */

.ai-models-pop {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  opacity: 0;
  pointer-events: none;
  min-width: 0;
  width: max-content;
  max-width: min(360px, 90vw);
  padding: 8px;
  border: 1px solid var(--fs-line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--fs-surface) 82%, transparent);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08),
              0 1px 3px rgba(0, 0, 0, 0.04);
  z-index: 20;
  transition: opacity 0.22s var(--fs-ease, ease),
              transform 0.22s var(--fs-ease, ease);
}

.ai-models-pop.is-open {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* Tiny caret pointing down */
.ai-models-pop::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 9px;
  height: 9px;
  background: color-mix(in srgb, var(--fs-surface) 82%, transparent);
  border-right: 1px solid var(--fs-line);
  border-bottom: 1px solid var(--fs-line);
}

/* Hidden state */
.ai-models-pop[hidden] {
  display: block !important;      /* keep in DOM for transitions */
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(6px);
}

.ai-models-pop-list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
  justify-content: center;
}

.ai-models-pop-item {
  padding: 0;
  border-radius: 6px;
  font-family: var(--fs-mono, monospace);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--fs-text-2);
  background: var(--fs-surface-2);
  transition: all 0.18s ease;
  line-height: 1.2;
  cursor: pointer;
}

.ai-model-link {
  display: block;
  padding: 0.3em 0.6em;
  color: inherit;
  text-decoration: none;
}

/* Hover highlight */
.ai-models-pop-item:hover {
  background: var(--fs-accent);
  color: #0b0d0b;
  font-weight: 700;
}

/* Dark mode */
[data-theme="dark"] .footer-brand-text {
  fill: #f0f0f0;
}

[data-theme="dark"] .ai-models-pop {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.32),
              0 1px 3px rgba(0, 0, 0, 0.16);
}

/* Responsive */
@media (max-width: 768px) {
  .footer-brand-section {
    margin: 20px auto 5px auto;
    padding: 0 3vw;
  }

  .powered-by-ai {
    flex-wrap: wrap;
    font-size: 0.65rem;
  }

  .ai-models-pop {
    max-width: 88vw;
  }
}