/* ==========================================================================
   zctheme.css —— ZC 设计系统（主题层 / 组件层）
   由 style.css 拆出：style.css 只管基础与布局，本文件只管主题与组件
   加载顺序必须是：style.css → zctheme.css（后者覆盖前者的主题变量）
   设计依据：Anthropic《Improving frontend design through Skills》四轴
             排版 / 配色与主题 / 动效 / 背景氛围
   ========================================================================== */

/* ==========================================================================
   ZC 设计系统 —— “尸变后的余晖” (After the Turn, the Afterglow)
   按 Anthropic《Improving frontend design through Skills》四轴落地：
   排版 / 配色与主题 / 动效 / 背景氛围
   全部样式定义集中在本文件；组件用语义类名，不再依赖工具类堆砌。
   ========================================================================== */

/* ------------------------------------------------------------------ 1. 令牌 */
:root {
  /* 字体：刻意避开 Inter / Roboto / Arial / system 默认 */
  --zc-font-display: 'Anton', 'Impact', 'Haettenschweiler', 'Arial Narrow', 'PingFang SC', sans-serif;
  --zc-font-body: 'IBM Plex Sans', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --zc-font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 浅色：隔离区白昼（骨白纸面 + 血红标记） */
  --zc-void: #eceae2;
  --zc-ash: #f7f5ef;
  --zc-ash-2: #fffdf7;
  --zc-line: #d9d5c9;
  --zc-line-soft: #e7e3d8;
  --zc-bone: #15181a;
  --zc-bone-dim: #5e6663;
  --zc-infect: #c8123a;
  --zc-ember: #a35c00;
  --zc-toxic: #0f7a45;

  --zc-radius: 14px;
  --zc-radius-lg: 20px;
  --zc-glow-infect: 0 0 0 1px rgba(200, 18, 58, 0.35), 0 10px 30px -14px rgba(200, 18, 58, 0.45);
  --zc-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html.dark {
  --zc-void: #07090a;
  --zc-ash: #0e1213;
  --zc-ash-2: #13181a;
  --zc-line: #232b2d;
  --zc-line-soft: #1a2122;
  --zc-bone: #e9e7df;
  --zc-bone-dim: #98a09c;
  --zc-infect: #ff2f52;
  --zc-ember: #ffb454;
  --zc-toxic: #5ee08a;
  --zc-glow-infect: 0 0 0 1px rgba(255, 47, 82, 0.35), 0 12px 34px -14px rgba(255, 47, 82, 0.55);
}

/* 旧令牌重定向到新皮肤（未迁移的页面也同步换肤） */
:root {
  --color-bg: var(--zc-void);
  --color-surface: var(--zc-ash);
  --color-surface-elevated: var(--zc-ash-2);
  --color-surface-hover: color-mix(in srgb, var(--zc-line) 55%, transparent);
  --color-border: var(--zc-line);
  --color-border-subtle: var(--zc-line-soft);
  --color-text: var(--zc-bone);
  --color-text-muted: var(--zc-bone-dim);
  --color-accent: var(--zc-infect);
  --color-accent-hover: color-mix(in srgb, var(--zc-infect) 80%, #000);
  --color-accent-soft: color-mix(in srgb, var(--zc-infect) 14%, transparent);
  --color-emerald: var(--zc-toxic);
  --color-amber: var(--zc-ember);
  --shadow-card: 0 18px 40px -18px rgba(0, 0, 0, 0.45);
}

/* ------------------------------------------------------- 2. 全局排版与背景 */
body {
  font-family: var(--zc-font-body);
  font-weight: 400;
  letter-spacing: 0.005em;
  color: var(--zc-bone);
  background-color: var(--zc-void);
  /* 分层氛围：尸变冷雾 + 余晖暖光 + 底部毒绿微光，而非纯色底 */
  background-image:
    radial-gradient(1100px 620px at 10% -10%, color-mix(in srgb, var(--zc-infect) 22%, transparent), transparent 62%),
    radial-gradient(900px 520px at 95% 4%, color-mix(in srgb, var(--zc-ember) 16%, transparent), transparent 60%),
    radial-gradient(760px 700px at 55% 115%, color-mix(in srgb, var(--zc-toxic) 10%, transparent), transparent 66%);
  background-attachment: fixed;
  background-repeat: no-repeat;
}

/* 颗粒噪点 + 暗角：纯 CSS 生成，不引入图片 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(120% 90% at 50% 40%, transparent 55%, rgba(0, 0, 0, 0.55) 100%);
}

html.dark body::after {
  background: radial-gradient(120% 90% at 50% 40%, transparent 50%, rgba(0, 0, 0, 0.72) 100%);
}

/* 让内容压在氛围层之上 */
header,
main,
footer,
.zc-modal {
  position: relative;
  z-index: 1;
}

::selection {
  background: var(--zc-infect);
  color: #fff;
}

/* 排版尺度：显示字体与正文拉开 3 倍以上差距，字重走极端 */
.zc-display,
.zc-hero h1,
.zc-section-title,
.zc-brand {
  font-family: var(--zc-font-display);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 0.95;
  color: var(--zc-bone);
}

.zc-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
}

.zc-section-title {
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  margin: 0;
}

.zc-mono,
.zc-tag,
.zc-credit {
  font-family: var(--zc-font-mono);
  font-variant-numeric: tabular-nums;
}

.zc-lede {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--zc-bone-dim);
  max-width: 62ch;
}

/* ------------------------------------------------------------- 3. 动效 */
@keyframes zc-rise {
  from {
    opacity: 0;
    transform: translate3d(0, 16px, 0);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes zc-heartbeat {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--zc-infect) 55%, transparent); }
  35% { box-shadow: 0 0 26px 4px color-mix(in srgb, var(--zc-infect) 40%, transparent); }
  70% { box-shadow: 0 0 0 0 transparent; }
}

@keyframes zc-flicker {
  0%, 100% { opacity: 1; }
  42% { opacity: 1; }
  45% { opacity: 0.45; }
  47% { opacity: 1; }
  62% { opacity: 0.72; }
  64% { opacity: 1; }
}

@keyframes zc-drift {
  0% { transform: translate3d(-6%, 0, 0) scale(1.06); opacity: 0.35; }
  50% { transform: translate3d(6%, -2%, 0) scale(1.14); opacity: 0.6; }
  100% { transform: translate3d(-6%, 0, 0) scale(1.06); opacity: 0.35; }
}

/* 入场错峰：一次性编排，胜过零散微交互 */
.zc-reveal {
  animation: zc-rise 0.7s var(--zc-ease) both;
}

.zc-stagger > * {
  animation: zc-rise 0.7s var(--zc-ease) both;
}
.zc-stagger > *:nth-child(1) { animation-delay: 0.04s; }
.zc-stagger > *:nth-child(2) { animation-delay: 0.12s; }
.zc-stagger > *:nth-child(3) { animation-delay: 0.2s; }
.zc-stagger > *:nth-child(4) { animation-delay: 0.28s; }
.zc-stagger > *:nth-child(5) { animation-delay: 0.36s; }
.zc-stagger > *:nth-child(6) { animation-delay: 0.44s; }
.zc-stagger > *:nth-child(n + 7) { animation-delay: 0.52s; }

.zc-flicker { animation: zc-flicker 6s infinite steps(1, end); }
.zc-fog { animation: zc-drift 26s ease-in-out infinite; }

@media (prefers-reduced-motion: reduce) {
  .zc-reveal,
  .zc-stagger > *,
  .zc-flicker,
  .zc-fog,
  .zc-cta {
    animation: none !important;
  }
}

/* ------------------------------------------------------------ 4. 组件 */
/* 必备：脱离 Tailwind 后 hidden 仍要生效 */
.hidden { display: none !important; }

/* 隔离胶带：主题化分隔 */
.zc-tape {
  height: 6px;
  border-radius: 3px;
  background-image: repeating-linear-gradient(
    45deg,
    var(--zc-ember) 0 12px,
    #101214 12px 24px
  );
  opacity: 0.85;
}

/* 小芯片（导航 / 页内目录 / 筛选） */
.zc-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 70%, transparent);
  color: var(--zc-bone-dim);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: color 0.18s var(--zc-ease), background-color 0.18s var(--zc-ease),
    border-color 0.18s var(--zc-ease), transform 0.18s var(--zc-ease);
}
.zc-chip:hover {
  color: var(--zc-bone);
  border-color: var(--zc-infect);
  background: color-mix(in srgb, var(--zc-infect) 12%, transparent);
  transform: translateY(-1px);
}
.zc-chip--accent { color: var(--zc-infect); border-color: color-mix(in srgb, var(--zc-infect) 45%, transparent); }

/* 徽标 */
.zc-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-family: var(--zc-font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 80%, transparent);
  color: var(--zc-bone-dim);
}
.zc-badge--infect { color: var(--zc-infect); border-color: color-mix(in srgb, var(--zc-infect) 45%, transparent); background: color-mix(in srgb, var(--zc-infect) 14%, transparent); }
.zc-badge--ember { color: var(--zc-ember); border-color: color-mix(in srgb, var(--zc-ember) 45%, transparent); background: color-mix(in srgb, var(--zc-ember) 14%, transparent); }
.zc-badge--toxic { color: var(--zc-toxic); border-color: color-mix(in srgb, var(--zc-toxic) 45%, transparent); background: color-mix(in srgb, var(--zc-toxic) 14%, transparent); }
.zc-badge--solid {
  background: var(--zc-infect);
  border-color: var(--zc-infect);
  color: #fff;
}

/* 卡片 */
.zc-card {
  border-radius: var(--zc-radius-lg);
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 88%, transparent);
  box-shadow: var(--shadow-card);
  padding: 1.1rem 1.25rem;
}

/* 用例卡（首屏三张 9:16） */
.zc-usecases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.9rem;
}
.zc-usecase {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--zc-radius-lg);
  border: 1px solid var(--zc-line);
  background: var(--zc-ash);
  box-shadow: var(--shadow-card);
  transition: transform 0.35s var(--zc-ease), border-color 0.35s var(--zc-ease),
    box-shadow 0.35s var(--zc-ease);
}
.zc-usecase:hover {
  transform: translateY(-4px);
  border-color: var(--zc-infect);
  box-shadow: var(--zc-glow-infect);
}
.zc-usecase__media {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 16;
  overflow: hidden;
  background: #05070a;
  border: 0;
  padding: 0;
  cursor: pointer;
  text-align: left;
}
.zc-usecase__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--zc-ease), filter 0.6s var(--zc-ease);
  filter: saturate(0.85) contrast(1.05);
}
.zc-usecase:hover .zc-usecase__media img {
  transform: scale(1.06);
  filter: saturate(1.05) contrast(1.1);
}
.zc-usecase__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(3, 5, 7, 0.92) 4%, rgba(3, 5, 7, 0.15) 45%, transparent 70%);
}
.zc-usecase__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.zc-usecase__play span {
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, #fff 18%, transparent);
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(6px);
  color: #fff;
  transition: transform 0.35s var(--zc-ease);
}
.zc-usecase:hover .zc-usecase__play span { transform: scale(1.12); }
.zc-usecase__meta {
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.75rem;
  color: #fff;
}
.zc-usecase__title {
  margin: 0;
  font-family: var(--zc-font-display);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 0.95rem;
  line-height: 1.1;
}
.zc-usecase__desc {
  margin: 0.2rem 0 0;
  font-size: 11px;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.72);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.zc-usecase__tag { position: absolute; top: 0.7rem; left: 0.7rem; }
.zc-usecase__time { position: absolute; top: 0.7rem; right: 0.7rem; }
.zc-usecase__foot { padding: 0.55rem; background: var(--zc-ash); }

/* 主 CTA：心跳呼吸 + 隔离胶带描边 */
.zc-cta,
.btn-generate-video {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.85rem 1rem;
  border: 0;
  border-radius: var(--zc-radius);
  font-family: var(--zc-font-display);
  font-size: 1rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #fff;
  cursor: pointer;
  background:
    linear-gradient(100deg, var(--zc-infect) 0%, color-mix(in srgb, var(--zc-infect) 60%, var(--zc-ember)) 58%, var(--zc-ember) 100%);
  box-shadow: 0 10px 26px -12px color-mix(in srgb, var(--zc-infect) 70%, transparent);
  animation: zc-heartbeat 2.6s ease-in-out infinite;
  transition: transform 0.2s var(--zc-ease), filter 0.2s var(--zc-ease);
}
.zc-cta:hover,
.btn-generate-video:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}
.zc-cta:active,
.btn-generate-video:active { transform: scale(0.99); }

/* 上传槽 */
.zc-slot,
.upload-slot-card {
  display: flex;
  flex-direction: column;
  padding: 0.7rem;
  border-radius: var(--zc-radius);
  border: 2px dashed var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 80%, transparent);
  transition: border-color 0.2s var(--zc-ease), box-shadow 0.2s var(--zc-ease);
  position: relative;
}
.zc-slot--infect:hover,
.upload-slot-card--infected:hover {
  border-color: color-mix(in srgb, var(--zc-infect) 65%, transparent);
  box-shadow: inset 0 0 30px -18px var(--zc-infect);
}
.zc-slot--survivor:hover,
.upload-slot-card--survivor:hover {
  border-color: color-mix(in srgb, var(--zc-toxic) 65%, transparent);
  box-shadow: inset 0 0 30px -18px var(--zc-toxic);
}
.zc-slot__tag { font-family: var(--zc-font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.03em; }
.zc-slot__drop,
.upload-dropzone {
  margin-top: auto;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 7rem;
  border-radius: 10px;
  border: 1px solid var(--zc-line-soft);
  background: color-mix(in srgb, var(--zc-line) 40%, transparent);
  overflow: hidden;
  position: relative;
}

/* 场景卡 / 分辨率卡 */
.zc-world,
.world-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  min-height: 3.4rem;
  padding: 0.6rem 0.5rem;
  text-align: center;
  border-radius: var(--zc-radius);
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 85%, transparent);
  color: var(--zc-bone);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s var(--zc-ease), background-color 0.2s var(--zc-ease),
    transform 0.2s var(--zc-ease), box-shadow 0.2s var(--zc-ease);
}
.zc-world:hover,
.world-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--zc-infect) 55%, transparent);
}
.zc-world.is-active,
.world-card.is-active,
.world-card[class*='border-rose-500'] {
  border-color: var(--zc-infect);
  background: color-mix(in srgb, var(--zc-infect) 12%, transparent);
  box-shadow: var(--zc-glow-infect);
}
.zc-world__icon { font-size: 1.1rem; }

.zc-res,
.res-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.4rem;
  border-radius: var(--zc-radius);
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 85%, transparent);
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s var(--zc-ease), background-color 0.2s var(--zc-ease),
    transform 0.2s var(--zc-ease), box-shadow 0.2s var(--zc-ease);
}
.zc-res:hover,
.res-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--zc-infect) 55%, transparent); }
.zc-res.is-active,
.res-card.is-active,
.res-card[class*='border-rose-500'] {
  border-color: var(--zc-infect);
  background: color-mix(in srgb, var(--zc-infect) 12%, transparent);
  box-shadow: var(--zc-glow-infect);
}
.zc-res__price { font-family: var(--zc-font-mono); font-size: 10px; color: var(--zc-infect); }

/* 示例头像芯片 */
.zc-sample {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: #fff;
  border: 0;
  cursor: pointer;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--zc-infect) 30%, transparent);
  transition: transform 0.2s var(--zc-ease), box-shadow 0.2s var(--zc-ease);
}
.zc-sample:hover { transform: scale(1.12); box-shadow: 0 0 0 3px color-mix(in srgb, var(--zc-infect) 55%, transparent); }
.zc-sample--pet { box-shadow: 0 0 0 2px color-mix(in srgb, var(--zc-ember) 35%, transparent); }
.zc-sample--hug { box-shadow: 0 0 0 2px color-mix(in srgb, #38bdf8 35%, transparent); }

/* 步骤编号 */
.zc-step {
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--zc-font-mono);
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  background: var(--zc-infect);
}

/* 段落文字（正文 / 合规页） */
.zc-prose {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--zc-bone-dim);
}
.zc-prose p { margin: 0 0 0.9rem; }
.zc-prose h2,
.zc-prose h3 { font-family: var(--zc-font-display); text-transform: uppercase; letter-spacing: 0.02em; color: var(--zc-bone); }
.zc-prose a { color: var(--zc-infect); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--zc-infect) 45%, transparent); }
.zc-prose a:hover { color: var(--zc-ember); border-color: var(--zc-ember); }

/* Tab / Toast / 播放器 / 弹窗 */
.zc-tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--zc-bone-dim);
  background: none;
  border: 0;
  cursor: pointer;
  transition: color 0.18s var(--zc-ease);
}
.zc-tab:hover { color: var(--zc-bone); }
.zc-tab.is-active { color: var(--zc-bone); border-bottom: 2px solid var(--zc-infect); }

.zc-toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash-2) 92%, transparent);
  box-shadow: 0 14px 34px -16px rgba(0, 0, 0, 0.7);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--zc-bone);
  animation: zc-rise 0.35s var(--zc-ease) both;
}

.zc-player-video {
  position: absolute;
  inset: 0;
  z-index: 20;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}

.zc-modal {
  border-radius: var(--zc-radius-lg);
  border: 1px solid var(--zc-line);
  background: var(--zc-ash-2);
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.85);
}

/* 提示条 */
.zc-advice {
  padding: 0.5rem 0.65rem;
  border-radius: 10px;
  font-size: 0.75rem;
  line-height: 1.55;
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-surface-hover, var(--zc-line)) 45%, transparent);
  color: var(--zc-bone-dim);
}
.zc-advice--ok { color: var(--zc-toxic); border-color: color-mix(in srgb, var(--zc-toxic) 35%, transparent); background: color-mix(in srgb, var(--zc-toxic) 12%, transparent); font-weight: 600; }
.zc-advice--warn { color: var(--zc-infect); border-color: color-mix(in srgb, var(--zc-infect) 35%, transparent); background: color-mix(in srgb, var(--zc-infect) 12%, transparent); font-weight: 600; }

/* 页脚 */
.zc-footer {
  border-top: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash) 70%, transparent);
  color: var(--zc-bone-dim);
  font-size: 0.8rem;
}
.zc-footer a { color: var(--zc-bone-dim); text-decoration: none; }
.zc-footer a:hover { color: var(--zc-infect); }

/* ------------------------------------------------- ZC 设计系统 · 补充件 */
.zc-panel {
  border-radius: var(--zc-radius-lg);
  border: 1px solid var(--zc-line);
  background: color-mix(in srgb, var(--zc-ash-2) 93%, transparent);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.zc-badge--onmedia {
  background: rgba(6, 8, 10, 0.72);
  border-color: rgba(255, 255, 255, 0.16);
  color: #fff;
  backdrop-filter: blur(6px);
}
.zc-usecase__time--amber { color: var(--zc-ember); }

.zc-chip--primary {
  background: var(--zc-infect);
  border-color: var(--zc-infect);
  color: #fff;
}
.zc-chip--primary:hover {
  background: color-mix(in srgb, var(--zc-infect) 85%, #fff);
  border-color: var(--zc-infect);
  color: #fff;
}

.zc-usecase__foot .zc-chip { width: 100%; justify-content: center; }
.zc-usecase__img { width: 100%; height: 100%; object-fit: cover; }

.zc-creditbar {
  display: flex;
  align-items: center;
  padding: 2px 2px 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--zc-line);
  background: var(--zc-ash-2);
  box-shadow: 0 6px 18px -12px rgba(0, 0, 0, 0.6);
}

.zc-card--row { display: flex; align-items: center; gap: 0.75rem; padding: 0.5rem; }

.zc-promptbox {
  margin-top: 0.5rem;
  max-height: 6rem;
  overflow-y: auto;
  padding: 0.5rem;
  border-radius: 10px;
  border: 1px solid var(--zc-line-soft);
  background: color-mix(in srgb, var(--zc-void) 70%, transparent);
  font-family: var(--zc-font-mono);
  font-size: 10px;
  line-height: 1.6;
  color: var(--zc-bone-dim);
  white-space: pre-wrap;
  -webkit-user-select: all;
  user-select: all;
}

.zc-sample { background: linear-gradient(135deg, var(--zc-infect), color-mix(in srgb, var(--zc-infect) 45%, #000)); }
.zc-sample--pet { background: linear-gradient(135deg, var(--zc-ember), #7c3d00); }
.zc-sample--hug { background: linear-gradient(135deg, #38bdf8, #075985); }

.zc-res__flag { position: absolute; top: -8px; right: 6px; }
.zc-res:not(.is-active) .zc-res__price { color: var(--zc-bone-dim); }

.swap-roles-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--zc-line);
  background: var(--zc-ash-2);
  color: var(--zc-bone);
  cursor: pointer;
  box-shadow: 0 8px 18px -10px rgba(0, 0, 0, 0.7);
  transition: background-color 0.2s var(--zc-ease), color 0.2s var(--zc-ease), transform 0.2s var(--zc-ease);
}
.swap-roles-btn:hover {
  background: var(--zc-infect);
  border-color: var(--zc-infect);
  color: #fff;
  transform: rotate(180deg);
}

/* 右栏各 section 的标题统一用显示字体 */
section[id^="sec-"] > h2 {
  font-family: var(--zc-font-display);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.05;
}

/* 用例卡播放按钮 + Hero 行芯片尺寸微调 */
.zc-usecase__playbtn {
  width: 3rem;
  height: 3rem;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, #ffffff 18%, transparent);
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(6px);
  color: #fff;
  transition: transform 0.35s var(--zc-ease);
}
.zc-usecase:hover .zc-usecase__playbtn { transform: scale(1.12); }

.zc-hero .zc-chip { padding: 0.5rem 0.9rem; font-size: 13px; }

/* 积分包：可点击选择（默认整卡可点，键盘 Enter/Space 同效） */
.zc-pack {
  cursor: pointer;
  border: 1px solid var(--color-border);
  transition: border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}
.zc-pack:hover { border-color: color-mix(in srgb, var(--zc-infect) 45%, transparent); }
.zc-pack:focus-visible { outline: 2px solid var(--zc-infect); outline-offset: 2px; }

/* 选中态：红框 + 淡红底 + 外发光，与未选中明显区分 */
.zc-pack--selected {
  border: 2px solid var(--zc-infect) !important;
  background: var(--color-accent-soft) !important;
  box-shadow: var(--zc-glow-infect);
}
.zc-pack--selected button {
  background: var(--zc-infect) !important;
  color: #fff !important;
}
.zc-pack--selected button:hover { background: var(--color-accent-hover) !important; }

/* 选中卡的角标：打勾，明确“已选这一档” */
.zc-pack__check {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 9999px;
  background: var(--zc-infect);
  color: #fff;
  font-size: 11px;
  line-height: 1.125rem;
  text-align: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.zc-pack--selected .zc-pack__check { opacity: 1; transform: scale(1); }

/* 余额不足时高亮“够用的最小包” */
.zc-pack--recommended {
  border-color: var(--zc-infect) !important;
  box-shadow: var(--zc-glow-infect);
}
.zc-pack__hint {
  display: none;
  margin-top: 0.4rem;
  font-family: var(--zc-font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--zc-infect);
}
.zc-pack--recommended .zc-pack__hint { display: block; }


/* 积分包：三档分辨率可兑换条数清单 */
.zc-pack__tiers {
  margin-top: 0.55rem;
  padding-top: 0.45rem;
  border-top: 1px dashed var(--color-border-subtle);
  display: grid;
  gap: 0.2rem;
}
.zc-pack__tier {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--zc-font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.zc-pack__tier--none { opacity: 0.45; }

/* 用例卡内联自动播放视频（静音循环，覆盖在封面图之上） */
.zc-usecase__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}