/* ===== imglish · 首页 =====
   设计要点：扁平、克制、偏学习工具的编辑感。
   不使用 3D 挤压阴影、不做卡片浮动位移，强调清晰的信息层级与留白。 */

/* --- 顶栏 --- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-head-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 13px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-head .mark {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.4px;
}

/* --- 顶栏「正在学习」人数 --- */
.online-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--ink-soft);
  background: var(--moss-wash);
  border: 1px solid #cfe9db;
  border-radius: 999px;
  padding: 5px 13px;
  white-space: nowrap;
}
.online-pill b {
  color: var(--moss-deep);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.online-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 3px rgba(47, 158, 99, 0.18);
  animation: onlinePulse 2.2s ease-in-out infinite;
}
.online-pill.is-zero { background: #f4f7f4; border-color: var(--line); color: var(--ink-faint); }
.online-pill.is-zero b { color: var(--ink-faint); }
.online-pill.is-zero .online-dot {
  background: var(--ink-faint);
  box-shadow: none;
  animation: none;
}
@keyframes onlinePulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(47, 158, 99, 0.18); }
  50% { box-shadow: 0 0 0 7px rgba(47, 158, 99, 0.05); }
}
@media (max-width: 620px) {
  .online-pill { font-size: 12px; padding: 4px 10px; gap: 6px; }
}
.site-head .mark-tile {
  width: 30px;
  height: 30px;
  font-size: 16px;
  border-radius: 8px;
  box-shadow: none;
}

/* --- 首屏 --- */
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 62px 24px 44px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-letter);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.6px;
  text-transform: uppercase;
  color: var(--moss-deep);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
}
.hero-title {
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(30px, 3.5vw, 44px);
  line-height: 1.3;
  letter-spacing: -0.4px;
  word-break: keep-all;
  margin: 0 0 18px;
  color: var(--ink);
}
.hero-title em { font-style: normal; color: var(--moss-deep); }
.hero-sub {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}
.hero-actions .btn { border-radius: 10px; padding: 11px 22px; font-weight: 600; }

.hero-stats {
  display: flex;
  margin: 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.hero-stats > div {
  padding-right: 30px;
  margin-right: 30px;
  border-right: 1px solid var(--line);
}
.hero-stats > div:last-child {
  padding-right: 0;
  margin-right: 0;
  border-right: 0;
}
.hero-stats dt {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.6px;
  margin-bottom: 3px;
}
.hero-stats dd {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* --- 首屏示例卡 --- */
.hero-preview {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  overflow: hidden;
}
.preview-media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: #eef2ee;
}
.preview-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}
.preview-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(34, 48, 42, 0.6);
  color: #fff;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.4px;
}
.preview-body { padding: 16px 18px 18px; }
.preview-tiles {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.ptile {
  min-width: 30px;
  height: 34px;
  padding: 0 7px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fafbfa;
  font-family: var(--font-letter);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--ink);
}
.ptile.is-ok {
  background: var(--moss-wash);
  border-color: rgba(47, 158, 99, 0.45);
  color: var(--moss-deep);
}
.preview-word {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}
.preview-word strong { font-size: 17px; font-weight: 700; color: var(--ink); }
.preview-word span { font-size: 13px; color: var(--ink-faint); }
.preview-word .preview-pinyin {
  color: var(--ink-soft);
  font-family: var(--font-letter);
  letter-spacing: 0.5px;
}

/* --- 学习分区 --- */
.pick {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 24px 10px;
}
.pick-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.pick-head h2 {
  font-family: var(--font-body);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin: 0;
  color: var(--ink);
}
.pick-chip {
  font-family: var(--font-letter);
  font-weight: 700;
  font-size: 11.5px;
  letter-spacing: 1.4px;
  padding: 3px 9px;
  border-radius: 6px;
}
.chip-en { background: var(--en-wash); color: var(--en); }
.chip-zh { background: var(--zh-wash); color: var(--zh); }
.chip-x { background: #eef1ee; color: var(--ink-soft); }
.pick-total { margin-left: auto; font-size: 13px; color: var(--ink-faint); }

.group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(222px, 1fr));
  gap: 18px;
}
.group-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
.group-card:hover {
  border-color: #cfdcd3;
  box-shadow: 0 6px 20px rgba(34, 48, 42, 0.07);
}
.group-card.is-all { border-color: rgba(47, 158, 99, 0.32); }
.group-card.is-all h3 { color: var(--moss-deep); }

.pick-cover {
  position: relative;
  height: 146px;
  background: #eef2ee;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.pick-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pick-cover-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #c3d0c6;
}

.pick-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 15px 16px 16px;
}
.pick-body h3 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin: 0;
  color: var(--ink);
}
.pick-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.pick-count { font-size: 13px; color: var(--ink-faint); }
.pick-go {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--moss-deep);
}
.pick-go i { font-style: normal; transition: transform 0.16s ease; }
.group-card:hover .pick-go i { transform: translateX(3px); }

.pick-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 22px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: var(--card);
  color: var(--ink-faint);
  font-size: 14.5px;
}
.pick-empty a { color: var(--moss-deep); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

.site-foot {
  margin-top: 26px;
  padding: 26px 20px 44px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--ink-faint);
  font-size: 13px;
}
.site-foot p { margin: 0; }

@media (max-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
    padding: 42px 20px 32px;
  }
  .hero-preview { max-width: 420px; }
}

@media (max-width: 720px) {
  .site-head-inner { padding: 11px 18px; }
  .mark { font-size: 17px; }
  .hero-title { font-size: clamp(25px, 7.2vw, 33px); }
  .hero-sub { font-size: 15px; margin-bottom: 22px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .hero-stats > div { padding-right: 20px; margin-right: 20px; }
  .hero-stats dd { font-size: 19px; }
  .hero-preview { max-width: none; }
  .pick { padding: 16px 18px 6px; }
  .pick-head { margin-bottom: 16px; }
  .group-grid { grid-template-columns: repeat(auto-fill, minmax(158px, 1fr)); gap: 13px; }
  .pick-cover { height: 112px; }
  .pick-body { padding: 13px 14px 14px; gap: 8px; }
  .pick-body h3 { font-size: 15.5px; }
  .site-foot { padding: 22px 18px max(30px, env(safe-area-inset-bottom)); }
}

/* 小屏手机：收紧卡片下限，保证两列排布 */
@media (max-width: 400px) {
  .group-grid { grid-template-columns: repeat(auto-fill, minmax(142px, 1fr)); gap: 12px; }
  .pick-cover { height: 104px; }
  .pick-count { font-size: 12.5px; }
  .pick-go { font-size: 13px; }
}