/* ============================================================
   chat.css · 对话创作页（ChatGPT 风格）
   依赖：style.css 设计令牌
   ============================================================ */

/* ---------- 页面容器 ---------- */
#chatPage {
  position: relative;
  background: var(--color-bg);
}

#chatPage.is-active {
  display: flex;
  flex-direction: column;
}

.chat-page {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 64px); /* 减去顶部导航 */
  max-width: var(--space-max);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--space-gutter);
  position: relative;
}

/* 轻量页面标识 */
.chat-page-label {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-ink-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 5;
  pointer-events: none;
}

/* 中间舞台：空态居中，有消息时撑满剩余空间 */
.chat-center-stage {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

.chat-page.is-empty .chat-center-stage {
  flex: 0 0 auto;
  margin-top: auto;
  margin-bottom: auto;
  padding: 24px 0 48px;
}

/* ---------- 头部 ---------- */
.chat-header {
  padding: 28px 0 18px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.chat-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.chat-header__title em {
  font-style: italic;
  color: var(--color-brand);
}

.chat-header__subtitle {
  margin-top: 8px;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  max-width: 46ch;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- 消息区 ---------- */
.chat-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 24px 0 100px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scroll-behavior: smooth;
}

.chat-page.is-empty .chat-messages {
  flex: 0 0 auto;
  overflow: visible;
  padding: 0;
}

/* 自定义滚动条 */
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-strong);
}

/* ---------- 聊天气泡 ---------- */
.chat-bubble {
  max-width: min(780px, 82%);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px 18px;
  font-size: 0.96rem;
  line-height: 1.65;
  animation: chatFadeIn 0.28s ease;
}

@keyframes chatFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-bubble--user {
  align-self: flex-end;
  background: var(--color-brand);
  color: #fff;
  border-bottom-right-radius: var(--radius-sm);
}

.chat-bubble--assistant {
  align-self: flex-start;
  background: var(--color-surface);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-bubble__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.85;
}

.chat-bubble--user .chat-bubble__meta {
  color: rgba(255, 255, 255, 0.85);
}

.chat-bubble--assistant .chat-bubble__meta {
  color: var(--color-brand);
}

.chat-bubble__avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  background: currentColor;
}

.chat-bubble--user .chat-bubble__avatar {
  color: rgba(255, 255, 255, 0.22);
}

.chat-bubble--assistant .chat-bubble__avatar {
  color: rgba(61, 90, 61, 0.14);
}

.chat-bubble__avatar svg {
  width: 12px;
  height: 12px;
  color: var(--color-brand);
}

.chat-bubble--user .chat-bubble__avatar svg {
  color: #fff;
}

.chat-bubble__text {
  white-space: pre-wrap;
  word-break: break-word;
}

/* Agent 输出卡片在气泡内 */
.chat-bubble .agent-output {
  margin: -4px -4px;
}

/* ---------- 加载态 ---------- */
.chat-bubble--loading {
  align-self: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink-soft);
  padding: 14px 18px;
}

.chat-bubble--loading .spinner {
  width: 16px;
  height: 16px;
  border-color: var(--color-accent-soft);
  border-top-color: var(--color-accent);
}

/* ---------- 欢迎页 ---------- */
.chat-welcome {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 0 36px;
  gap: 22px;
}

.chat-welcome__greeting {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.2;
}

.chat-welcome__greeting span {
  color: var(--color-brand);
}

.chat-welcome__greeting small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-ink-soft);
}

.chat-welcome__icon {
  width: 64px;
  height: 64px;
  color: var(--color-brand);
  opacity: 0.85;
}

.chat-welcome__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.15;
}

.chat-welcome__title em {
  font-style: italic;
  color: var(--color-brand);
}

.chat-welcome__desc {
  font-size: 1rem;
  color: var(--color-ink-soft);
  max-width: 52ch;
  line-height: 1.7;
}

.chat-welcome__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 640px;
}

.quick-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: all 0.18s ease;
}

.quick-chip:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.quick-chip svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
}

/* ---------- 输入区 ---------- */
.chat-input-area {
  position: sticky;
  bottom: 0;
  z-index: 10;
  padding: 14px 0 24px;
  background: linear-gradient(to top, var(--color-bg) 70%, transparent);
}

.chat-page.is-empty .chat-input-area {
  position: relative;
  background: transparent;
  padding-top: 8px;
}

.chat-input-box {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 10px 12px 10px 16px;
  box-shadow: var(--shadow-md);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chat-input-box:focus-within {
  border-color: var(--color-brand);
  box-shadow: 0 0 0 3px rgba(61, 90, 61, 0.1), var(--shadow-md);
}

#chatInput {
  flex: 1 1 auto;
  min-height: 24px;
  max-height: 160px;
  padding: 6px 0;
  border: none;
  background: transparent;
  resize: none;
  outline: none;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--color-ink);
}

#chatInput::placeholder {
  color: var(--color-ink-faint);
}

#chatSendBtn {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--color-brand);
  color: #fff;
  transition: background 0.2s ease, transform 0.15s ease;
}

#chatSendBtn:hover:not(:disabled) {
  background: var(--color-brand-deep);
  transform: scale(1.05);
}

#chatSendBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#chatSendBtn svg {
  width: 18px;
  height: 18px;
}

.chat-input__hint {
  text-align: center;
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--color-ink-faint);
}

/* ---------- 一键成片按钮 ---------- */
.chat-compose {
  align-self: flex-start;
  margin-top: -6px;
  margin-left: 0;
}

.chat-compose .btn--primary {
  background: var(--color-accent);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

.chat-compose .btn--primary:hover:not(:disabled) {
  background: #bfa05a;
  border-color: #bfa05a;
  color: var(--color-ink);
}

/* ---------- 视频结果卡片 ---------- */
.chat-video-result {
  align-self: flex-start;
  width: 100%;
  max-width: min(780px, 82%);
}

/* ---------- 顶部工具栏 ---------- */
.chat-toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 10px 0 0;
}

.chat-toolbar button {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.chat-toolbar button:hover {
  color: var(--color-brand);
  background: rgba(61, 90, 61, 0.06);
}

/* ---------- 作品展示 ---------- */
.chat-showcase {
  padding: 32px 0 8px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

.chat-page:not(.is-empty) .chat-showcase {
  display: none;
}

.chat-showcase__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.chat-showcase__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-showcase__title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.chat-showcase__more {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color 0.2s ease;
}

.chat-showcase__more:hover {
  color: var(--color-brand);
}

.chat-showcase__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.chat-showcase__card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.chat-showcase__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.chat-showcase__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.chat-showcase__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.chat-showcase__card:hover .chat-showcase__media img {
  transform: scale(1.04);
}

.chat-showcase__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(31, 31, 31, 0.55) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 14px;
  color: #fff;
  pointer-events: none;
}

.chat-showcase__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-brand);
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.chat-showcase__card:hover .chat-showcase__play {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.05);
}

.chat-showcase__play svg {
  width: 18px;
  height: 18px;
  margin-left: 2px;
}

.chat-showcase__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 6px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}

.chat-showcase__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.95;
}

.chat-showcase__tag {
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
}

.chat-showcase__info {
  padding: 12px 14px;
}

.chat-showcase__desc {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .chat-page {
    padding: 0 14px;
  }

  .chat-header {
    padding: 20px 0 14px;
  }

  .chat-messages {
    padding-bottom: 110px;
  }

  .chat-bubble {
    max-width: 92%;
    padding: 14px;
  }

  .chat-input-area {
    padding-bottom: 18px;
  }

  .chat-input-box {
    padding: 10px 10px 10px 14px;
  }

  #chatSendBtn {
    width: 38px;
    height: 38px;
  }

  .chat-showcase__grid {
    grid-template-columns: 1fr;
  }
}