/* ============================================================
   背单词花园 · 文章页样式（列表页 + 详情页）
   依赖 style.css 的设计变量
   ============================================================ */

/* ---------- A. 文章列表页 ---------- */
.art-hero {
  padding: 52px 0 34px;
  background:
    radial-gradient(760px 340px at 50% -34%, #DFF6E7, transparent 70%),
    linear-gradient(180deg, #FBFFFC, #fff);
  text-align: center;
}
.art-hero h1 { margin-bottom: 14px; }
.art-hero p.sub {
  font-size: 17px; color: var(--body); max-width: 660px; margin: 0 auto 26px;
}

.art-toolbar {
  display: flex; flex-wrap: wrap; gap: 14px; align-items: center;
  justify-content: space-between; margin-bottom: 26px;
}
.searchbox {
  position: relative; flex: 1 1 300px; max-width: 420px;
}
.searchbox input {
  width: 100%; padding: 13px 18px 13px 46px;
  border: 1.5px solid var(--line-2); border-radius: var(--pill);
  font-size: 15px; font-family: inherit; color: var(--ink);
  background: #fff; transition: border-color .2s, box-shadow .2s;
}
.searchbox input::placeholder { color: #A9B8AE; }
.searchbox input:focus {
  outline: none; border-color: var(--green-400);
  box-shadow: 0 0 0 4px rgba(76, 196, 127, .16);
}
.searchbox svg {
  position: absolute; left: 17px; top: 50%; transform: translateY(-50%);
  color: var(--muted); pointer-events: none;
}
.art-count { font-size: 14px; color: var(--muted); }
.art-count b { color: var(--green-600); }

.chips { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 34px; }
.chip {
  padding: 8px 17px; border-radius: var(--pill); cursor: pointer;
  border: 1.5px solid var(--line-2); background: #fff;
  color: var(--ink-2); font-size: 14.5px; font-weight: 700;
  font-family: inherit; transition: .18s;
}
.chip:hover { border-color: var(--green-400); color: var(--green-700); }
.chip.active {
  background: var(--green-600); border-color: var(--green-600); color: #fff;
  box-shadow: 0 6px 16px rgba(33, 148, 85, .26);
}

.art-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.art-card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--sh-sm); overflow: hidden;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.art-card:hover { transform: translateY(-4px); box-shadow: var(--sh); border-color: var(--green-200); }
.art-card .ac-top {
  height: 6px; background: linear-gradient(90deg, var(--green-400), var(--leaf));
}
.art-card:nth-child(3n+2) .ac-top { background: linear-gradient(90deg, var(--sky), #8FD8F7); }
.art-card:nth-child(3n+3) .ac-top { background: linear-gradient(90deg, var(--sun), #FFE199); }
.art-card .ac-body { padding: 22px 22px 18px; flex: 1; display: flex; flex-direction: column; }
.art-card .ac-cat {
  font-size: 12.5px; font-weight: 800; color: var(--green-600);
  background: var(--green-50); border-radius: var(--pill);
  padding: 3px 11px; align-self: flex-start; margin-bottom: 12px;
}
.art-card h3 { font-size: 17.5px; margin-bottom: .45em; }
.art-card h3 a { color: var(--ink); }
.art-card h3 a:hover { color: var(--green-600); }
.art-card .ac-desc {
  font-size: 14.5px; color: var(--body); margin-bottom: 16px; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}
.art-card .ac-foot {
  display: flex; align-items: center; gap: 12px;
  font-size: 12.5px; color: var(--muted);
  border-top: 1px dashed var(--line-2); padding-top: 13px;
}
.art-card .ac-foot .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--line-2); }

.art-empty {
  grid-column: 1 / -1; text-align: center; padding: 70px 20px;
  background: var(--bg-soft); border: 1px dashed var(--line-2);
  border-radius: var(--r-lg); color: var(--muted);
}
.load-more-wrap { text-align: center; margin-top: 38px; }

/* ---------- B. 文章详情页 ---------- */
.art-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 268px;
  gap: 46px; align-items: start; padding-bottom: 20px;
}

.art-head { padding: 26px 0 22px; border-bottom: 1px solid var(--line); margin-bottom: 30px; }
.art-head .ah-cat {
  display: inline-block; font-size: 13px; font-weight: 800;
  color: var(--green-700); background: var(--green-100);
  padding: 5px 14px; border-radius: var(--pill); margin-bottom: 15px;
}
.art-head h1 { font-size: clamp(25px, 2.9vw, 36px); margin-bottom: 16px; }
.art-head .ah-meta {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  font-size: 14px; color: var(--muted); align-items: center;
}
.art-head .ah-meta span { display: inline-flex; align-items: center; gap: 6px; }
.art-head .ah-meta svg { color: var(--green-500); }

.art-lead {
  font-size: 17px; color: var(--ink-2); line-height: 1.8;
  background: var(--green-50); border-left: 4px solid var(--green-400);
  border-radius: 0 var(--r) var(--r) 0; padding: 20px 24px; margin-bottom: 34px;
}
.art-lead p:last-child { margin-bottom: 0; }

/* 正文排版 */
.art-body { font-size: 16.5px; line-height: 1.92; color: var(--body); }
.art-body > *:first-child { margin-top: 0; }
.art-body h2 {
  font-size: clamp(21px, 2.2vw, 26px); margin: 46px 0 16px;
  padding-left: 16px; position: relative;
}
.art-body h2::before {
  content: ""; position: absolute; left: 0; top: .18em; bottom: .18em;
  width: 6px; border-radius: 4px;
  background: linear-gradient(180deg, var(--green-400), var(--leaf));
}
.art-body h3 {
  font-size: 19px; margin: 32px 0 12px; color: var(--ink);
}
.art-body h3::before { content: ""; display: inline-block; width: 8px; height: 8px;
  background: var(--sun); border-radius: 3px; margin-right: 9px; vertical-align: 2px; }
.art-body p { margin: 0 0 1.15em; }
.art-body strong { color: var(--ink); }
.art-body ul, .art-body ol { margin: 0 0 1.3em; padding-left: 1.4em; }
.art-body li { margin-bottom: .5em; }
.art-body li::marker { color: var(--green-500); font-weight: 700; }
.art-body a { color: var(--green-600); font-weight: 600; text-decoration: underline;
  text-decoration-color: var(--green-200); text-underline-offset: 3px; }
.art-body a:hover { color: var(--green-700); text-decoration-color: var(--green-400); }
.art-body img {
  border-radius: var(--r-lg); margin: 26px auto; box-shadow: var(--sh);
  border: 1px solid var(--line); max-width: 100%;
}
/* 竖版手机截图：收窄成卡片，避免在正文里被拉得过高 */
.art-body img.shot {
  max-width: min(100%, 400px);
  border-radius: 26px; border: 6px solid #fff;
  box-shadow: 0 18px 46px rgba(23, 116, 63, .18);
  margin: 0 auto;
}
.art-fig { margin: 34px auto; text-align: center; }
.art-fig img { margin-left: auto; margin-right: auto; }
.art-fig figcaption {
  margin-top: 12px; font-size: 13.5px; color: var(--muted);
  line-height: 1.6; max-width: 460px; margin-left: auto; margin-right: auto;
}
.art-body blockquote {
  margin: 24px 0; padding: 18px 24px; background: var(--bg-soft);
  border-left: 4px solid var(--green-200); border-radius: 0 var(--r) var(--r) 0;
  color: var(--ink-2);
}
.art-body blockquote p:last-child { margin-bottom: 0; }
.art-body code {
  background: var(--green-50); color: var(--green-700);
  padding: 2px 7px; border-radius: 6px; font-size: .92em;
}
.art-body hr { border: 0; border-top: 1px dashed var(--line-2); margin: 40px 0; }

/* 表格：横向可滚，圆角化 */
.art-body table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  margin: 24px 0; font-size: 15px; border-radius: var(--r);
  overflow: hidden; border: 1px solid var(--line);
  box-shadow: var(--sh-sm);
}
.art-body thead th {
  background: var(--green-100); color: var(--green-700);
  font-weight: 800; text-align: left;
}
.art-body th, .art-body td { padding: 13px 16px; border-bottom: 1px solid var(--line); }
.art-body tbody tr:last-child td { border-bottom: 0; }
.art-body tbody tr:nth-child(even) { background: var(--bg-soft); }

/* 提示 / 提醒 块 */
.art-body .box {
  border-radius: var(--r-lg); padding: 24px 26px; margin: 28px 0;
  font-size: 15.5px; position: relative;
}
.art-body .box p:last-child { margin-bottom: 0; }
.art-body .box .bt {
  display: block; font-weight: 800; color: var(--ink);
  margin-bottom: 9px; font-size: 16px;
}
.art-body .box.tip { background: #F1FBF4; border: 1px solid var(--green-200); }
.art-body .box.tip .bt::before { content: "TIP "; font-size: 11px; letter-spacing: .12em;
  color: var(--green-600); background: var(--green-100); border-radius: 5px;
  padding: 2px 6px; margin-right: 8px; vertical-align: 2px; }
.art-body .box.warn { background: #FFF7EC; border: 1px solid #FFE0B0; }
.art-body .box.warn .bt::before { content: "注意"; font-size: 11px; letter-spacing: .08em;
  color: #A06600; background: #FFF0D2; border-radius: 5px;
  padding: 2px 6px; margin-right: 8px; vertical-align: 2px; }

/* 文末 FAQ */
.art-faq { margin: 46px 0 0; }
.art-faq h2 { font-size: 23px; margin-bottom: 18px; padding-left: 0; }
.art-faq h2::before { display: none; }
.art-faq details {
  border: 1px solid var(--line); border-radius: var(--r); background: #fff;
  margin-bottom: 10px; box-shadow: var(--sh-sm); overflow: hidden;
}
.art-faq summary {
  cursor: pointer; list-style: none; padding: 17px 50px 17px 20px;
  font-weight: 700; color: var(--ink); font-size: 16px; position: relative;
}
.art-faq summary::-webkit-details-marker { display: none; }
.art-faq summary::after {
  content: ""; position: absolute; right: 22px; top: 50%;
  width: 9px; height: 9px; border-right: 2.5px solid var(--green-500);
  border-bottom: 2.5px solid var(--green-500);
  transform: translateY(-70%) rotate(45deg); transition: transform .22s;
}
.art-faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.art-faq details[open] summary { color: var(--green-700); }
.art-faq .a { padding: 0 20px 18px; color: var(--body); font-size: 15.5px; }
.art-faq .a p:last-child { margin-bottom: 0; }

/* 标签 */
.art-tags {
  display: flex; flex-wrap: wrap; gap: 9px; align-items: center;
  margin: 40px 0 0; padding-top: 26px; border-top: 1px dashed var(--line-2);
}
.art-tags b { font-size: 14px; color: var(--muted); font-weight: 700; }
.art-tags a {
  font-size: 13.5px; font-weight: 700; color: var(--green-700);
  background: var(--green-50); border: 1px solid var(--green-100);
  padding: 5px 14px; border-radius: var(--pill);
}
.art-tags a:hover { background: var(--green-100); }

/* 上下篇 */
.prevnext {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 34px;
}
.prevnext a {
  display: block; background: #fff; border: 1px solid var(--line);
  border-radius: var(--r); padding: 18px 20px; box-shadow: var(--sh-sm);
  font-weight: 700; color: var(--ink); font-size: 15.5px;
  transition: .2s; line-height: 1.55;
}
.prevnext a:hover { border-color: var(--green-400); box-shadow: var(--sh); transform: translateY(-2px); }
.prevnext a span {
  display: block; font-size: 12.5px; color: var(--green-600);
  font-weight: 800; margin-bottom: 5px; letter-spacing: .04em;
}
.prevnext .next { text-align: right; }
.prevnext .empty { visibility: hidden; }

/* 侧栏 */
.side { position: sticky; top: calc(var(--nav-h) + 20px); display: grid; gap: 18px; }
.side-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 22px; box-shadow: var(--sh-sm);
}
.side-card h2, .side-card h3 {
  font-size: 15.5px; margin-bottom: 14px; color: var(--ink);
  display: flex; align-items: center; gap: 8px;
}
.side-card h2::before, .side-card h3::before {
  content: ""; width: 5px; height: 16px; border-radius: 3px;
  background: linear-gradient(180deg, var(--green-400), var(--leaf));
}
.toc { max-height: 46vh; overflow-y: auto; }
.toc ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 3px; }
.toc li.lv3 { padding-left: 14px; }
.toc a {
  display: block; font-size: 14px; color: var(--body); padding: 5px 9px;
  border-radius: 8px; line-height: 1.5; font-weight: 600;
}
.toc a:hover, .toc a.active { background: var(--green-50); color: var(--green-700); }

.side-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 13px; }
.side-list li { margin: 0; }
.side-list a {
  font-size: 14.5px; color: var(--ink-2); font-weight: 600; line-height: 1.6;
  display: block;
}
.side-list a:hover { color: var(--green-600); }
.side-list time { display: block; font-size: 12.5px; color: var(--muted); margin-top: 3px; }

.side-cta {
  background: linear-gradient(150deg, var(--green-500), var(--green-700));
  border: 0; color: #CBEBD9; text-align: center;
}
.side-cta h3 { color: #fff; justify-content: center; }
.side-cta h3::before { display: none; }
.side-cta p { font-size: 14px; margin-bottom: 16px; }
.side-cta .btn { width: 100%; }
.side-cta img.qr { width: 120px; margin: 0 auto 12px; border-radius: 12px;
  background: #fff; padding: 6px; }

/* 相关文章 */
.related { margin-top: 56px; padding-top: 34px; border-top: 1px solid var(--line); }
.related h2 { font-size: 23px; margin-bottom: 22px; }

/* ---------- D. 列表页「产品专题」区块 ---------- */
.feat-strip {
  background: linear-gradient(180deg, #F4FCF7, #fff);
  border: 1px solid var(--green-100);
  border-radius: var(--r-xl);
  padding: 34px 34px 30px;
}
.feat-strip h2 { font-size: clamp(21px, 2.3vw, 27px); margin-bottom: 10px; }
.feat-strip > p {
  font-size: 16px; color: var(--body); max-width: 780px; margin-bottom: 26px;
}
.feat-strip .post { background: #fff; }
.feat-strip .post h3 { font-size: 16.5px; }

/* 首页「产品专题」入口卡片 */
.topic-links {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}
.topic-links li { margin: 0; }
.topic-links a {
  display: flex; flex-direction: column; height: 100%;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 22px 24px; box-shadow: var(--sh-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.topic-links a:hover {
  transform: translateY(-3px); border-color: var(--green-200); box-shadow: var(--sh);
}
.topic-links b {
  display: block; font-size: 17px; color: var(--ink);
  margin-bottom: 8px; line-height: 1.55;
}
.topic-links a:hover b { color: var(--green-600); }
.topic-links p { font-size: 14.5px; color: var(--body); margin: 0; line-height: 1.75; }
.topic-links .tl-cat {
  order: -1; align-self: flex-start;
  font-size: 12px; font-weight: 800; color: var(--green-600);
  background: var(--green-50); border: 1px solid var(--green-100);
  border-radius: var(--pill); padding: 2px 11px; margin-bottom: 11px;
}

/* ---------- E. 专题文章（线上迁移内容）补充排版 ---------- */
/* 副题：位于正文开头，用一条虚线和大标题分隔 */
.art-body .subtitle,
.art-body .subtitle-top {
  font-size: clamp(17px, 1.9vw, 20px); font-weight: 800;
  color: var(--green-700); line-height: 1.65;
  margin: 0 0 24px; padding-bottom: 16px;
  border-bottom: 2px dashed var(--green-100);
}
/* 引言块 */
.art-body .intro {
  background: var(--green-50); border-left: 4px solid var(--green-400);
  border-radius: 0 var(--r) var(--r) 0;
  padding: 20px 24px; margin: 0 0 32px;
}
.art-body .intro p:last-child { margin-bottom: 0; }
/* 章节容器与示例块 */
.art-body .section { margin: 0; }
.art-body .example {
  background: var(--bg-cream); border: 1px dashed #F0DDB2;
  border-radius: var(--r); padding: 18px 22px; margin: 22px 0;
}
.art-body .example > *:last-child { margin-bottom: 0; }
/* 小结 / 结论 */
.art-body .conclusion,
.art-body .summary-box {
  background: #F1FBF4; border: 1px solid var(--green-200);
  border-radius: var(--r-lg); padding: 24px 26px; margin: 32px 0;
}
.art-body .conclusion > *:last-child,
.art-body .summary-box > *:last-child { margin-bottom: 0; }
.art-body .summary-title {
  font-weight: 800; color: var(--green-700); font-size: 17px; margin-bottom: 12px;
}
/* 测评卡片 */
.art-body .compare-card {
  background: #fff; border: 1px solid var(--line); border-left: 5px solid var(--green-400);
  border-radius: var(--r-lg); padding: 22px 24px; margin: 20px 0;
  box-shadow: var(--sh-sm);
}
.art-body .compare-card > *:last-child { margin-bottom: 0; }
.art-body .compare-card h3 { margin: 0 0 10px; }
.art-body .compare-card h3::before { display: none; }
/* 人群卡三列 */
.art-body .grid-three {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 24px 0;
}
.art-body .user-card {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: var(--r); padding: 18px 20px;
}
.art-body .user-card h3 { margin: 0 0 8px; font-size: 17px; }
.art-body .user-card h3::before { display: none; }
.art-body .user-card > *:last-child { margin-bottom: 0; }
/* 提示条 */
.art-body .tip-box,
.art-body .tip-green,
.art-body .tip-blue,
.art-body .tip-orange {
  border-radius: var(--r); padding: 18px 22px; margin: 22px 0;
  font-size: 15.5px; border: 1px solid var(--green-200); background: #F1FBF4;
}
.art-body .tip-blue { background: #F0F8FE; border-color: #C6E4F7; }
.art-body .tip-orange { background: #FFF7EC; border-color: #FFE0B0; }
.art-body .tip-box > *:last-child { margin-bottom: 0; }
/* 行内高亮 */
.art-body .highlight {
  background: linear-gradient(transparent 60%, #FFE9A8 60%);
  font-weight: 700; color: var(--ink); padding: 0 1px;
}
.art-body .text-avoid { color: #C0392B; font-weight: 700; }
.art-body .text-recommend { color: var(--green-700); font-weight: 700; }
/* 对比表在手机上横向滚动 */
.art-body table.compare-table { min-width: 560px; }
.art-body .table-scroll { overflow-x: auto; }

/* ---------- F. 文章页响应式 ---------- */
@media (max-width: 1040px) {
  .art-grid { grid-template-columns: repeat(2, 1fr); }
  .art-layout { grid-template-columns: 1fr; gap: 34px; }
  .side { position: static; }
  .toc { max-height: none; }
}
@media (max-width: 900px) {
  .art-body .grid-three { grid-template-columns: 1fr; }
  .topic-links { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .art-grid { grid-template-columns: 1fr; }
  .art-body { font-size: 16px; }
  .art-body table { font-size: 14px; display: block; overflow-x: auto; }
  .prevnext { grid-template-columns: 1fr; }
  .art-lead { padding: 16px 18px; font-size: 15.5px; }
  .art-toolbar { flex-direction: column; align-items: stretch; }
  .searchbox { max-width: none; }
  .feat-strip { padding: 24px 20px 22px; border-radius: var(--r-lg); }
}