/* ========================================
   PAGE: 世界入口
   ======================================== */
.page-world-entry {
  justify-content: center;
  align-items: center;
  padding: var(--space-6);
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.world-entry-video {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
  position: relative;
  margin-bottom: var(--space-8);
}

.world-entry-video::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, 
    var(--color-surface) 0%, 
    var(--color-surface-elevated) 50%, 
    var(--color-surface) 100%);
  animation: shimmer 2s infinite;
}

.world-entry-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

@keyframes shimmer {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.5; }
}

.world-entry-text {
  text-align: center;
  margin-bottom: var(--space-10);
}

.world-entry-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.world-entry .btn-secondary {
  max-width: 200px;
}

/* ========================================
   PAGE: 分支选择页
   ======================================== */
.page-branch-select {
  background: var(--color-primary);
}

.branch-header {
  display: flex;
  align-items: center;
  padding: var(--space-4);
  padding-top: calc(var(--space-4) + env(safe-area-inset-top, 20px));
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.branch-title {
  flex: 1;
  text-align: center;
  font-size: 17px;
  font-weight: 600;
  margin-right: 40px;
}

.branch-hint {
  padding: var(--space-4);
  text-align: center;
}

.branch-hint p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.branch-timeline {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.branch-node {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.branch-node:hover {
  background: var(--color-surface-elevated);
}

.branch-node.selected {
  border-color: var(--color-accent);
  background: var(--color-surface-elevated);
}

.branch-node.is-current {
  background: linear-gradient(135deg, var(--color-surface) 0%, rgba(78, 204, 163, 0.1) 100%);
}

.branch-node.is-current.selected {
  border-color: var(--color-alive);
}

.branch-node-index {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  width: 28px;
  text-align: center;
}

.branch-thumb {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.branch-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.branch-info {
  flex: 1;
}

.branch-label {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 2px;
}

.branch-time {
  font-size: 12px;
  color: var(--color-text-muted);
}

.branch-current-tag {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  background: rgba(78, 204, 163, 0.2);
  color: var(--color-alive);
  border-radius: var(--radius-full);
  margin-top: 4px;
}

.branch-node-arrow {
  font-size: 14px;
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.branch-node.selected .branch-node-arrow {
  opacity: 1;
  color: var(--color-accent);
}

.branch-node.is-current.selected .branch-node-arrow {
  color: var(--color-alive);
}

.branch-footer {
  padding: var(--space-4);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 20px));
}

.branch-action-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
  padding: var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.branch-action-hint.is-continue {
  background: rgba(78, 204, 163, 0.1);
  color: var(--color-alive);
}

.branch-action-hint.is-branch {
  background: rgba(233, 69, 96, 0.1);
  color: var(--color-accent);
}

/* ========================================
   PAGE: 生成中
   ======================================== */
.page-generating {
  justify-content: center;
  align-items: center;
  padding: var(--space-6);
}

.generating-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-surface);
  border-top-color: var(--color-text-secondary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-6);
}

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

.generating-text {
  font-size: 15px;
  color: var(--color-text-secondary);
}

/* ========================================
   PAGE: 接力完成
   ======================================== */
.page-done {
  padding: var(--space-4);
  padding-top: calc(var(--space-8) + env(safe-area-inset-top, 20px));
}

.done-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.done-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.done-title {
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--space-6);
}

.done-info {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: auto;
}

.done-info-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) 0;
  font-size: 14px;
}

.done-info-row .label {
  color: var(--color-text-muted);
}

.done-info-row .value {
  color: var(--color-text-primary);
}

.done-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 20px));
}

/* ========================================
   PAGE: 世界为空
   ======================================== */
.page-empty {
  justify-content: center;
  align-items: center;
  padding: var(--space-6);
}

.empty-icon {
  width: 80px;
  height: 80px;
  border: 2px solid var(--color-text-muted);
  border-radius: 50%;
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-icon span {
  font-size: 40px;
  color: var(--color-text-muted);
}

.empty-text {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}