/* ============ SCREENS ============ */
.screen { display: none; width: 100%; height: 100%; position: absolute; top: 0; left: 0; }
.screen.active { display: flex; }

/* ============ LOADING SCREEN ============ */
#loading-screen {
  align-items: center; justify-content: center;
  background: var(--bg-dark);
  background-image: radial-gradient(ellipse at 50% 30%, rgba(124,92,252,0.08) 0%, transparent 60%);
}

.loading-container {
  display: flex; flex-direction: column; align-items: center;
  max-width: 320px; width: 80%; gap: 24px;
}
.loading-container > * + * { margin-top: 24px; }

.loading-logo {
  font-family: 'Nunito', sans-serif;
  font-weight: 900; font-size: 32px;
  color: #7c5cfc;
  letter-spacing: -0.5px;
}
.loading-logo span { color: #ff5c8a; }

.loading-spinner {
  width: 40px; height: 40px;
  border: 4px solid var(--bg-card-lighter);
  border-top-color: var(--accent-purple);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-progress-track {
  width: 100%; height: 6px;
  background: var(--bg-card-lighter);
  border-radius: 3px; overflow: hidden;
}
.loading-progress-fill {
  height: 100%;
  background: var(--progress-gradient);
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.loading-status {
  font-family: 'Quicksand', sans-serif;
  font-size: 13px; font-weight: 600;
  color: var(--text-muted);
}

.loading-error {
  text-align: center;
  color: var(--accent-pink);
  font-family: 'Quicksand', sans-serif;
  font-size: 14px; font-weight: 600;
  line-height: 1.5;
}

/* ============ COVER SCREEN ============ */
#cover-screen {
  align-items: center; justify-content: center;
  background: var(--bg-dark);
  background-image: radial-gradient(ellipse at 50% 30%, rgba(124,92,252,0.08) 0%, transparent 60%);
}

.cover-container {
  display: flex; flex-direction: column; align-items: center;
  max-width: 420px; width: 90%; padding: 32px 24px;
  animation: coverFadeIn 0.6s ease-out;
}

@keyframes coverFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.cover-close-btn {
  position: absolute; top: 20px; right: 20px;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--bg-card-lighter); border: none;
  color: var(--text-muted); font-size: 18px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: var(--transition-smooth);
}
.cover-close-btn:hover { background: var(--bg-card); color: var(--text-white); }

.cover-image-wrapper {
  width: 200px; height: 200px; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-xl);
  border: 3px solid var(--bg-card-lighter);
  margin-bottom: 24px;
}
.cover-image-wrapper img {
  width: 100%; height: 100%; object-fit: cover;
}

.cover-title-label {
  font-family: 'Quicksand', sans-serif;
  font-size: 14px; color: var(--text-muted);
  margin-bottom: 6px; font-weight: 600;
}

.cover-title {
  font-family: 'Nunito', sans-serif;
  font-size: 26px; font-weight: 900;
  text-align: center; margin-bottom: 6px;
  line-height: 1.2;
}

.cover-subtitle {
  font-size: 13px; color: var(--text-muted);
  margin-bottom: 32px; font-weight: 500;
}

.start-reading-btn {
  width: 100%; padding: 16px 32px;
  background: var(--accent-purple);
  border: none; border-radius: 50px;
  color: white; font-family: 'Nunito', sans-serif;
  font-size: 18px; font-weight: 800;
  cursor: pointer; transition: var(--transition-smooth);
  box-shadow: 0 4px 20px var(--accent-purple-glow);
  letter-spacing: 0.3px;
}
.start-reading-btn:hover {
  background: var(--accent-purple-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 28px var(--accent-purple-glow);
}
.start-reading-btn:active { transform: translateY(0); }

.share-btn-cover {
  display: flex; align-items: center; gap: 8px;
  margin-top: 20px; padding: 10px 20px;
  background: var(--bg-card); border: 1px solid var(--bg-card-lighter);
  border-radius: 50px; color: var(--text-white);
  font-family: 'Quicksand', sans-serif; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: var(--transition-smooth);
}
.share-btn-cover > * + * { margin-left: 8px; }
.share-btn-cover:hover { background: var(--bg-card-lighter); }
.share-icon { color: var(--accent-pink); font-size: 16px; }

/* Reset margin fallbacks when flexbox gap is supported */
@supports (gap: 1px) {
  .loading-container > * + * { margin-top: 0; }
  .share-btn-cover > * + * { margin-left: 0; }
}