/* ============ 延世复习站 · 深绿色系主题 ============ */
:root[data-theme="dark"] {
  --bg: #0c1812;
  --bg-elev: #122019;
  --bg-elev2: #183028;
  --border: #244235;
  --border-soft: #1c352a;
  --primary: #2f9e6b;
  --primary-soft: #1f6f4c;
  --accent: #57c98e;
  --text: #e7f3ec;
  --muted: #9bbcad;
  --muted-2: #6f9384;
  --good: #4fd08a;
  --bad: #ff7a7a;
  --chip: #143b2a;
  --chip-text: #8fe0b4;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
  /* 顶部深色通栏 */
  --band-bg: #143026;
  --band-text: #eaf5ef;
  --band-muted: #9bbcad;
  --band-line: #2a5c46;
  --mark-bg: #5fd896;
  --mark-text: #082015;
}
:root[data-theme="light"] {
  --bg: #eef5f0;
  --bg-elev: #ffffff;
  --bg-elev2: #f1f8f3;
  --border: #cfe3d6;
  --border-soft: #dcebe1;
  --primary: #1f7a4d;
  --primary-soft: #2f9e6b;
  --accent: #1f7a4d;
  --text: #143426;
  --muted: #4f7461;
  --muted-2: #7a9889;
  --good: #15824b;
  --bad: #c63a3a;
  --chip: #e3f3ea;
  --chip-text: #1f7a4d;
  --shadow: 0 1px 3px rgba(20,60,40,.12);
  --band-bg: #1f7a4d;
  --band-text: #ffffff;
  --band-muted: #d6ecdf;
  --band-line: #2f9e6b;
  --mark-bg: #7fe0ad;
  --mark-text: #0e3524;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
.ko-font { font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; }

/* ---------- 顶栏（深色通栏，内容 1120px 居中） ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  min-height: 72px; padding: 10px max(22px, 50vw - 560px);
  background: var(--band-bg); color: var(--band-text);
}
.brand {
  display: flex; align-items: center; gap: 12px; text-align: left;
  color: var(--band-text); text-decoration: none; cursor: pointer;
  background: none; border: 0; padding: 0;
}
.brand-mark {
  background: var(--mark-bg); color: var(--mark-text);
  width: 38px; height: 38px; border-radius: 8px; flex: none;
  display: grid; place-items: center; font-size: 19px; font-weight: 900;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  line-height: 1; letter-spacing: 0;
}
.brand-text strong { display: block; font-size: 17px; font-weight: 800; }
.brand-text small { display: block; font-size: 11px; color: var(--band-muted); }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.course-count {
  border: 1px solid var(--band-line); border-radius: 6px;
  padding: 6px 10px; font-size: 12px; white-space: nowrap;
}
.icon-btn {
  display: inline-flex; align-items: center; gap: 4px; line-height: 1;
  background: rgba(255,255,255,.10); color: var(--band-text);
  border: 1px solid var(--band-line); border-radius: 9px;
  padding: 8px 10px; cursor: pointer;
}
.icon-btn:hover { background: rgba(255,255,255,.20); }
.badge {
  background: var(--bad); color: #fff; font-size: 11px; font-weight: 700;
  border-radius: 10px; padding: 1px 6px;
}

/* 搜索（顶栏内） */
.search-wrap { position: relative; }
.search-wrap input {
  width: 210px; padding: 8px 12px; border-radius: 7px; font: inherit; font-size: 13px;
  border: 1px solid var(--band-line); background: rgba(255,255,255,.10); color: var(--band-text);
}
.search-wrap input::placeholder { color: var(--band-muted); }
.search-results {
  position: absolute; top: 40px; right: 0; left: 0; z-index: 40;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 10px; max-height: 60vh; overflow: auto;
  box-shadow: var(--shadow); color: var(--text);
}
.sr-item { padding: 9px 12px; cursor: pointer; border-bottom: 1px solid var(--border-soft); }
.sr-item:hover { background: var(--bg-elev2); }
.sr-ko { font-weight: 600; }
.sr-meta { color: var(--muted); font-size: 12px; }

/* ---------- 主页深色 hero 通栏 ---------- */
.app-shell { min-height: 100vh; }
.summary-band {
  background: var(--band-bg); color: var(--band-text);
  border-top: 1px solid var(--band-line);
  min-height: 200px; padding: 36px max(22px, 50vw - 560px) 34px;
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 24px; flex-wrap: wrap;
}
.summary-band .eyebrow { color: var(--mark-bg); font-size: 12px; font-weight: 800; letter-spacing: 1px; }
.summary-band h1 { margin: 10px 0 8px; font-size: clamp(28px, 4.4vw, 44px); line-height: 1.06; letter-spacing: 0; }
.summary-band p { margin: 0; color: var(--band-muted); }
.summary-stats { display: flex; gap: 34px; }
.summary-stats span { color: var(--band-muted); font-size: 12px; text-align: center; }
.summary-stats strong { color: var(--band-text); font-size: 25px; display: block; margin-bottom: 2px; }

/* ---------- 顶部 tabs（居中 4 等分，sticky） ---------- */
.tabs {
  position: sticky; top: 0; z-index: 20;
  max-width: 1120px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--bg-elev); border: 1px solid var(--border); border-top: 0;
}
.tab-item {
  display: flex; justify-content: center; align-items: center; gap: 7px;
  height: 58px; font-size: 14px; color: var(--muted); text-decoration: none;
  cursor: pointer; background: transparent; border: 0;
  border-right: 1px solid var(--border);
}
.tab-item:last-child { border-right: 0; }
.tab-item:hover { background: var(--bg-elev2); color: var(--text); }
.tab-item.active { color: var(--primary); box-shadow: inset 0 -3px var(--primary); font-weight: 700; }
.tab-ico { flex: none; }

/* ---------- 内容区（居中） ---------- */
.content-wrap { width: min(1120px, 100% - 32px); margin: 28px auto 60px; }

/* ---------- 章节课程列表（2 列表格） ---------- */
.chapter-list { display: grid; gap: 24px; }
.chapter > header {
  display: flex; align-items: baseline; gap: 10px; margin-bottom: 10px;
  padding-bottom: 6px; border-bottom: 2px solid var(--primary-soft);
}
.chapter > header h2 { margin: 0; font-size: 18px; }
.chapter > header span { font-size: 13px; color: var(--muted); }
.lesson-list {
  display: grid; grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border-soft); border-radius: 12px; overflow: hidden;
}
.lesson-row {
  display: grid; grid-template-columns: 50px 1fr auto 20px; align-items: center; gap: 12px;
  min-height: 88px; padding: 14px 16px; text-align: left; cursor: pointer;
  background: var(--bg-elev); border: 0; border-bottom: 1px solid var(--border-soft);
  color: var(--text); font: inherit;
}
.lesson-row:nth-child(odd) { border-right: 1px solid var(--border-soft); }
.lesson-row:nth-last-child(-n+2) { border-bottom: 0; }
.lesson-row:hover { background: var(--bg-elev2); }
.lesson-number {
  display: grid; place-items: center; width: 46px; height: 40px;
  border: 1px solid var(--border); border-bottom: 3px solid var(--primary);
  border-radius: 6px; font-weight: 800; font-size: 13px;
}
.lesson-copy strong { display: block; font-size: 15px; }
.lesson-copy small { display: block; color: var(--muted); margin-top: 4px; font-size: 12px; }
.lesson-meta { color: var(--primary); white-space: nowrap; font-size: 11px; }
.row-arrow { color: var(--muted-2); font-size: 20px; text-align: center; }

/* ---------- 课程块 ---------- */
.back-link {
  display: inline-block; color: var(--muted); font-size: 14px;
  text-decoration: none; margin-bottom: 12px; cursor: pointer;
}
.back-link:hover { color: var(--accent); }
.lesson-header {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 14px 18px; margin-bottom: 22px; border-radius: 12px;
  background: var(--bg-elev); border: 1px solid var(--border);
}
.lh-crumb { font-size: 12px; color: var(--muted-2); }
.lesson-header h1 { margin: 4px 0 2px; font-size: 23px; }
.lesson-header p { margin: 0; font-size: 13px; color: var(--muted); }
.lesson-badge {
  flex-shrink: 0; background: var(--chip); color: var(--chip-text);
  font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 8px; white-space: nowrap;
}
.block { margin: 26px 0; }
.block h2 {
  font-size: 18px; margin: 0 0 12px; padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-soft);
}
.block h2 small { color: var(--muted); font-size: 12px; font-weight: 400; margin-left: 6px; }
.section-heading-tools { display: flex; align-items: center; justify-content: space-between; }
.section-heading-tools h2 { border-bottom: none; margin-bottom: 0; flex: 1; }

/* 课文 */
.text-line {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px; border-radius: 10px; background: var(--bg-elev);
  border: 1px solid var(--border-soft); margin-bottom: 8px;
}
.speaker {
  flex-shrink: 0; background: var(--chip); color: var(--chip-text);
  font-size: 12px; font-weight: 700; padding: 3px 8px; border-radius: 7px;
  margin-top: 2px; white-space: nowrap;
}
.tl-body { flex: 1; }
.tl-ko { font-size: 16px; line-height: 1.5; }
.tl-zh { font-size: 13px; color: var(--muted); margin-top: 2px; }
.mini-speak {
  flex-shrink: 0; background: var(--bg-elev2); border: 1px solid var(--border);
  color: var(--accent); border-radius: 8px; padding: 5px 9px; cursor: pointer; font-size: 14px;
}
.mini-speak:hover { border-color: var(--primary); }
.read-all { align-self: center; }

/* 单词卡片 */
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.word-card {
  position: relative; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 14px 12px;
}
.word-card:hover { border-color: var(--primary-soft); }
.wc-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.wc-head strong { font-size: 18px; }
.w-roman { font-size: 12px; color: var(--muted-2); }
.speak-button {
  position: absolute; top: 12px; right: 12px;
  background: var(--bg-elev2); border: 1px solid var(--border); color: var(--accent);
  border-radius: 8px; padding: 5px 9px; cursor: pointer; font-size: 14px;
}
.speak-button.sm { position: static; padding: 2px 7px; font-size: 12px; }
.speak-button:hover { border-color: var(--primary); }
.meaning { margin: 0; font-size: 14px; color: var(--text); cursor: pointer; }
.meaning.meaning-hidden { color: var(--muted-2); font-size: 13px; font-style: italic; }
.occurrences { color: var(--muted); margin-top: 8px; font-size: 11px; }
.occ-btn {
  background: var(--chip); color: var(--chip-text); border: 1px solid var(--border-soft);
  border-radius: 6px; padding: 2px 7px; font-size: 11px; cursor: pointer; margin: 0 3px;
}
.occ-btn:hover { border-color: var(--primary); }

/* 语法 */
.grammar-list { display: grid; gap: 12px; }
.grammar-item {
  display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start;
  background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 12px 14px;
}
.unit-tag {
  min-width: 40px; height: 28px; padding: 0 8px;
  display: grid; place-items: center; align-self: start;
  background: var(--chip); color: var(--chip-text);
  font-size: 12px; font-weight: 700; border-radius: 8px;
  border: 1px solid var(--border-soft); cursor: pointer; font-family: inherit;
}
.unit-tag:hover { border-color: var(--primary); }
.grammar-item h3 { margin: 2px 0 6px; font-size: 16px; color: var(--accent); }
.g-meaning { font-size: 13px; color: var(--muted); margin: 0 0 8px; line-height: 1.6; }
.g-ex {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: 6px 0 0; padding: 6px 10px; border-left: 3px solid var(--primary-soft);
  background: var(--bg-elev2); border-radius: 0 8px 8px 0;
}
.ex-ko { font-size: 15px; }
.ex-zh { font-size: 13px; color: var(--muted); }

/* 速记（核心问答） */
.quick-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.quick-item {
  background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-left: 3px solid var(--primary-soft); border-radius: 9px; padding: 10px 13px;
}
.quick-item strong { display: block; font-size: 15px; }
.quick-item span { display: block; margin-top: 4px; font-size: 13px; color: var(--muted); }

/* 测验 */
.quiz-list { display: flex; flex-direction: column; gap: 12px; }
.quiz-q { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin: 0; background: var(--bg-elev); }
.quiz-q legend { font-weight: 700; font-size: 15px; padding: 0 6px; }
.qidx { color: var(--primary); margin-right: 4px; }
.q-opts { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.q-opt {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px;
  border: 1px solid var(--border); border-radius: 9px; cursor: pointer; font-size: 15px;
}
.q-opt:hover { border-color: var(--primary-soft); }
.q-opt input { accent-color: var(--primary); }
.q-opt.correct { background: rgba(79,208,138,.16); border-color: var(--good); color: var(--good); font-weight: 600; }
.q-opt.wrong { background: rgba(255,122,122,.14); border-color: var(--bad); color: var(--bad); }
.q-explain { margin: 10px 0 0; padding: 8px 12px; border-radius: 8px; font-size: 13px; }
.q-explain.ok { background: rgba(79,208,138,.12); color: var(--good); }
.q-explain.err { background: rgba(255,122,122,.10); color: var(--bad); }
.submit {
  margin-top: 16px; background: var(--primary); color: #fff; border: none;
  border-radius: 10px; padding: 11px 22px; font-size: 15px; font-weight: 700; cursor: pointer;
}
.submit:hover { background: var(--primary-soft); }
.submit:disabled { opacity: .55; cursor: default; }
.score { margin-top: 12px; font-size: 16px; font-weight: 700; color: var(--accent); }

/* ---------- 总览页通用（单词/语法/测验） ---------- */
.overview { padding-top: 4px; }
.heading-tools {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; margin-bottom: 18px; flex-wrap: wrap;
}
.ht-title { display: flex; align-items: center; gap: 12px; }
.ht-icon { color: var(--primary); display: grid; place-items: center; flex: none; }
.ht-title h2 { margin: 0; font-size: 22px; }
.ht-detail { display: block; font-size: 12px; color: var(--muted); margin-top: 3px; }
.search-box {
  display: flex; align-items: center; gap: 10px; height: 50px; padding: 0 15px;
  margin-bottom: 20px; border: 1px solid var(--border); border-radius: 7px;
  background: var(--bg-elev); color: var(--muted);
}
.search-box input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  color: var(--text); font: inherit;
}
.quiz-course-picker { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; font-size: 14px; }
.quiz-course-picker select {
  flex: 1; max-width: 420px; padding: 9px 12px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--bg-elev2); color: var(--text); font: inherit;
}
.standalone-quiz header {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px; margin-bottom: 18px;
  border-radius: 12px; background: var(--bg-elev); border: 1px solid var(--border);
}
.standalone-quiz header h2 { margin: 2px 0; font-size: 20px; }
.standalone-quiz header p { margin: 0; font-size: 13px; color: var(--muted); }

/* 错题本 */
.wrong-card { background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.wc-q { font-size: 15px; margin-bottom: 4px; }
.wc-a { font-size: 13px; color: var(--muted); }
.wc-a .bad { color: var(--bad); font-weight: 700; }
.wc-a .good { color: var(--good); font-weight: 700; }

.empty { color: var(--muted); padding: 40px 0; text-align: center; }

/* ---------- 移动端 ---------- */
@media (max-width: 820px) {
  .topbar { min-height: 64px; padding: 10px 16px; flex-wrap: wrap; gap: 10px; }
  .brand-text small { display: none; }
  .search-wrap input { width: 130px; }
  .course-count { display: none; }
  .summary-band { min-height: auto; padding: 28px 20px; display: block; }
  .summary-stats { margin-top: 18px; gap: 22px; }
  .tabs { border-left: 0; border-right: 0; }
  .tab-item { flex-direction: column; gap: 2px; height: 54px; font-size: 11px; }
  .content-wrap { width: calc(100% - 22px); margin-top: 14px; }
  .lesson-list { grid-template-columns: 1fr; }
  .lesson-row { grid-template-columns: 48px 1fr 18px; }
  .lesson-row:nth-child(odd) { border-right: 0; }
  .lesson-meta { display: none; }
  .word-grid { grid-template-columns: 1fr; }
  .search-box { height: 46px; }
}