/* Components — reusable UI primitives. All micro-interactions live here. */

/* ───── Buttons ───── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--fs-body);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  user-select: none;
}

.btn:active { transform: translateY(2px); box-shadow: none; }

.btn--primary {
  background: var(--color-accent);
  color: var(--color-dark-text);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { background: var(--color-accent-hover); box-shadow: var(--shadow-md); color: var(--color-dark-text); }

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--secondary:hover { border-color: var(--color-text); background: var(--color-bg-alt); }

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  padding-inline: 0;
}
.btn--ghost::after {
  content: '→';
  transition: transform var(--dur-fast) var(--ease-out);
}
.btn--ghost:hover::after { transform: translateX(4px); }

/* ───── Navigation ───── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-bg-blur);
  backdrop-filter: saturate(150%) blur(16px);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav__inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.nav__brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav__links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
}

.nav__link {
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--fs-small);
  position: relative;
  padding: var(--space-2) 0;
}
.nav__link::after {
  content: ''; position: absolute; inset: auto 0 0 0;
  height: 1px; background: var(--color-accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-medium) var(--ease-out);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__lang {
  font-size: var(--fs-caption);
  color: var(--color-text-soft);
  letter-spacing: var(--tracking-loose);
  text-transform: uppercase;
}
.nav__lang a { color: var(--color-text-soft); text-decoration: none; }
.nav__lang a:hover, .nav__lang a[aria-current="true"] { color: var(--color-text); }

@media (max-width: 768px) {
  .nav__links { display: none; } /* Hamburger to be added in a future task if needed */
}

/* ───── Cards ───── */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--dur-medium) var(--ease-out),
              box-shadow var(--dur-medium) var(--ease-out),
              border-color var(--dur-medium) var(--ease-out);
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--color-text-soft); }

.card__image { aspect-ratio: 16 / 10; overflow: hidden; background: var(--color-bg-alt); }
.card__image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-slow) var(--ease-out); }
.card:hover .card__image img { transform: scale(1.03); }
.card__body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.card__title { font-size: var(--fs-h3); font-family: var(--font-display); font-weight: 500; }
.card__meta { font-size: var(--fs-caption); color: var(--color-text-soft); letter-spacing: var(--tracking-loose); text-transform: uppercase; }
.card__excerpt { color: var(--color-text-soft); font-size: var(--fs-small); }

.card--disabled { opacity: 0.55; pointer-events: none; }

/* ───── Forms ───── */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-body);
  transition: border-color var(--dur-fast) var(--ease-out);
}
.input:focus { border-color: var(--color-accent); outline: none; box-shadow: var(--shadow-focus); }

/* ───── Toast / copied indicator ───── */
.copy-toast {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--color-accent);
  color: var(--color-dark-text);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: var(--fs-small); font-weight: 500;
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-medium) var(--ease-out),
              transform var(--dur-medium) var(--ease-out);
}
.copy-toast--visible { opacity: 1; transform: translate(-50%, -50%) scale(1); }

/* ───── Skeleton loading ───── */
@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}
.skeleton {
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* ───── Footer ───── */
.footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
  padding-block: var(--space-8) var(--space-5);
  margin-top: var(--space-10);
}
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-7); max-width: var(--content-max); margin-inline: auto; padding-inline: var(--space-5); }
.footer__heading { font-family: var(--font-display); font-size: var(--fs-body); font-weight: 500; margin-bottom: var(--space-3); letter-spacing: var(--tracking-loose); text-transform: uppercase; color: var(--color-dark-text); opacity: 0.8; }
.footer__tagline { opacity: 0.7; font-size: var(--fs-small); }
.footer__col ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.footer__col a { color: var(--color-dark-text); opacity: 0.8; text-decoration: none; font-size: var(--fs-small); }
.footer__col a:hover { opacity: 1; color: var(--color-dark-text); }
.footer__meta { margin-top: var(--space-7); padding-top: var(--space-5); border-top: 1px solid var(--color-border-subtle); font-size: var(--fs-caption); opacity: 0.5; max-width: var(--content-max); margin-inline: auto; padding-inline: var(--space-5); }
@media (max-width: 768px) { .footer__inner { grid-template-columns: 1fr; } }

/* ───── Flip cards (NotebookLM styles) ───── */
.flipcard { perspective: 1000px; -webkit-perspective: 1000px; aspect-ratio: 16 / 9; }
.flipcard__inner { position: relative; width: 100%; height: 100%; transition: transform 0.6s var(--ease-in-out); transform-style: preserve-3d; -webkit-transform-style: preserve-3d; cursor: pointer; }
.flipcard.is-flipped .flipcard__inner { transform: rotateY(180deg); -webkit-transform: rotateY(180deg); }
.flipcard__face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; }
.flipcard__front { background: var(--color-bg-alt); }
.flipcard__front img { width: 100%; height: 100%; object-fit: cover; }
.flipcard__overlay { position: absolute; inset: auto 0 0 0; padding: var(--space-5) var(--space-4) var(--space-4); background: linear-gradient(0deg, rgba(26,26,24,0.95) 0%, rgba(26,26,24,0.75) 55%, rgba(26,26,24,0) 100%); color: var(--color-dark-text); }
.flipcard__title { font-family: var(--font-display); font-size: var(--fs-body); font-weight: 500; color: var(--color-dark-text); margin: 0; }
.flipcard__category { font-size: var(--fs-caption); opacity: 0.7; letter-spacing: var(--tracking-loose); text-transform: uppercase; }
.flipcard__back { background: var(--color-dark-bg); color: var(--color-dark-text); transform: rotateY(180deg); padding: var(--space-5); gap: var(--space-4); }
.flipcard__prompt { flex: 1; font-size: var(--fs-small); line-height: var(--lh-normal); overflow-y: auto; font-family: var(--font-mono); opacity: 0.9; }
.flipcard__back .btn { align-self: stretch; }
.flipcard__back .copy-btn { background: var(--color-copy); color: var(--color-dark-text); }
.flipcard__back .copy-btn:hover { background: var(--color-copy-hover); color: var(--color-dark-text); }
.flipcard__back .copy-toast { background: var(--color-highlight); }

.styles-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: var(--space-4); }

.skeleton--card { aspect-ratio: 16 / 9; border-radius: var(--radius-md); }

/* ───── Modal (gated downloads) ───── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(26,26,24,0.6);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-medium) var(--ease-out);
  z-index: 100;
}
.modal-backdrop--open { opacity: 1; pointer-events: auto; }

.modal {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  max-width: 440px; width: calc(100% - 2rem);
  padding: var(--space-7);
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.98);
  transition: transform var(--dur-medium) var(--ease-out);
  position: relative;
}
.modal-backdrop--open .modal { transform: translateY(0) scale(1); }

.modal h3 { margin-bottom: var(--space-3); }
.modal__desc { color: var(--color-text-soft); margin-bottom: var(--space-5); font-size: var(--fs-small); }
.modal__form { display: flex; flex-direction: column; gap: var(--space-3); }
.modal__submit { margin-top: var(--space-3); }
.modal__close {
  position: absolute; top: var(--space-3); right: var(--space-3);
  background: transparent; border: 0; font-size: 1.5rem; line-height: 1;
  cursor: pointer; color: var(--color-text-soft); padding: var(--space-2);
  border-radius: var(--radius-sm);
}
.modal__close:hover { color: var(--color-text); }
.modal__success { display: none; text-align: center; padding: var(--space-4); }
.modal__success--visible { display: block; }