/*
 * town-home.css — BigData 首页双模式适配层
 *
 * 设计目标：
 *   - 复用 BigData 已有的 body.light（日 Minimalist Flat）与 :root（夜 Nocturne Glass）
 *     主题令牌；适配层只消费 var(--token)，不写任何 --token 覆盖，不发明新令牌。
 *   - 所有选择器收口在 .town-home 子树内；只允许通过 body.light / body:not(.light)
 *     消费主题状态。禁止 html / body / :root / #app / main 等全局选择器。
 *   - 主题切换纯 class 切换，不刷页面；CSS 自动跟随 body.light 切换。
 *
 * 命名空间：
 *   - 默认规则：.town-home *（夜模式基线，因 :root 已是夜）
 *   - 日模式覆写：body.light .town-home *（仅在日模式生效）
 *
 * 文案白名单（与 town-home.js 一致）：Welcome To BigData / 第 N 轮 / 本轮进度 /
 *   错题池 / Let's get started / BigData welcome。
 */

.town-home {
  position: relative;
  width: 100%;
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 2rem;
  font-family: var(--font-body);
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ---- 顶部图片区 ---- */
.town-home__hero {
  position: relative;
  width: 100%;
  height: clamp(280px, 40vh, 420px);
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid var(--border);
  background: var(--card);
  opacity: 0;
  transform: translateY(-12px);
  animation: townhome-hero-in 240ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* 夜模式 hero 主题化处理：暗化 + 玻璃模糊，不破坏识别度 */
body:not(.light) .town-home__hero {
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-color: var(--border);
}
body:not(.light) .town-home__hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(11, 19, 34, 0.18) 0%,
    rgba(11, 19, 34, 0.38) 100%
  );
  pointer-events: none;
}
body:not(.light) .town-home__hero img {
  filter: brightness(0.82) saturate(0.95);
}

.town-home__hero img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  clip-path: ellipse(100% 60% at 50% 40%);
}

@keyframes townhome-hero-in {
  to { opacity: 1; transform: translateY(0); }
}

/* ---- 中部文案区 ---- */
.town-home__content {
  margin-top: 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(8px);
  animation: townhome-rise-in 200ms cubic-bezier(0.4, 0, 0.2, 1) 80ms forwards;
}

.town-home__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-2xl);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
}

/* 日模式标题：system-ui 900 黑体 */
body.light .town-home__title {
  font-weight: 900;
}

.town-home__title .accent {
  color: var(--accent);
}

.town-home__progress {
  margin: 0;
  color: var(--text2);
  font-size: var(--fs-bs);
  line-height: 1.5;
  opacity: 0;
  transform: translateY(8px);
  animation: townhome-rise-in 200ms cubic-bezier(0.4, 0, 0.2, 1) 140ms forwards;
}

/* 占位态：API 失败 / 未加载时灰化 */
.town-home__progress[data-progress-empty="true"] {
  color: var(--text2);
  opacity: 0.65;
}

.town-home__progress .line {
  display: block;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transform: translateY(6px);
  animation: townhome-progress-in 220ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.town-home__progress .line-round {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
  letter-spacing: 0.01em;
  animation-delay: 160ms;
}

.town-home__progress .line-progress {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.15rem;
  animation-delay: 200ms;
}

.town-home__progress .line-wrong {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text2);
  animation-delay: 240ms;
}

@keyframes townhome-progress-in {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes townhome-rise-in {
  to { opacity: 1; transform: translateY(0); }
}
/* 三个 keyframes 同体,各自命名仅为语义区分 */

/* ---- 底部主按钮 ---- */
.town-home__actions {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
}

.town-home__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.75rem;
  min-width: 14rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--accent);
  color: var(--btn-text);
  font: inherit;
  font-weight: 700;
  font-size: var(--fs-bs);
  cursor: pointer;
  transition: opacity 150ms ease, transform 150ms ease;
  opacity: 0;
  transform: translateY(8px);
  animation: townhome-rise-in 200ms cubic-bezier(0.4, 0, 0.2, 1) 200ms forwards;
}

.town-home__cta:hover {
  opacity: 0.9;
}

.town-home__cta:active {
  transform: translateY(1px) scale(0.99);
}

.town-home__cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* 日模式焦点环改近黑 */
body.light .town-home__cta:focus-visible {
  outline-color: #0A0A0A;
}

.town-home__cta[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

/* ---- 日模式硬边覆写：圆角归零、加粗边、零阴影 ---- */
body.light .town-home__hero {
  border-radius: 0;
  border: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: none;
}

body.light .town-home__hero::after {
  display: none;
}

body.light .town-home__hero img {
  filter: none;
}

body.light .town-home__cta {
  border-radius: 0;
  border: none;
}

/* ---- 响应式：小高度视口与极窄屏 ---- */
@media (max-height: 600px) {
  .town-home__hero {
    height: 220px;
  }
}

@media (max-width: 768px) {
  .town-home__hero {
    height: clamp(220px, 36vh, 320px);
  }
  .town-home__title {
    font-size: var(--fs-xl);
  }
}

@media (max-width: 420px) {
  .town-home {
    padding: 0.75rem 1rem 1.5rem;
  }
  .town-home__hero {
    height: 220px;
  }
  .town-home__cta {
    width: 100%;
    min-width: 0;
  }
}

/* ---- prefers-reduced-motion：关闭动画但保证全部内容可见 ---- */
@media (prefers-reduced-motion: reduce) {
  .town-home,
  .town-home__hero,
  .town-home__content,
  .town-home__progress,
  .town-home__progress .line,
  .town-home__cta {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
    opacity: 1 !important;
    transform: none !important;
  }
}