/* ============ Agent 面试题库 · 浅色主题 ============ */
:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-2: #fafbfc;
  --border: #e4e7ec;
  --border-strong: #d0d5dd;
  --text: #1a1d23;
  --text-2: #4a5058;
  --text-3: #7b828c;
  --accent: #3b5bdb;
  --accent-soft: #eef1fd;
  --accent-2: #0b7285;
  --green: #2f9e44;
  --green-soft: #ebfbee;
  --amber: #b8860b;
  --amber-soft: #fdf6e3;
  --red: #d6336c;
  --red-soft: #fff0f6;
  --code-bg: #f6f8fa;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16,24,40,.05), 0 1px 3px rgba(16,24,40,.06);
  --shadow-lg: 0 4px 16px rgba(16,24,40,.08);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 布局 ---------- */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 268px; flex: 0 0 268px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
}
.brand { display: flex; gap: 10px; align-items: center; padding: 18px 16px 14px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px; flex: 0 0 34px;
  background: linear-gradient(135deg, #3b5bdb, #1c3fa8);
  color: #fff; font-weight: 700; display: grid; place-items: center; font-size: 17px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.brand-text strong { font-size: 14.5px; }
.brand-text span { font-size: 11.5px; color: var(--text-3); }

.side-actions { display: flex; gap: 6px; padding: 0 12px 12px; flex-wrap: wrap; }

.nav { flex: 1; overflow-y: auto; padding: 4px 8px 12px; }
.nav-group-title {
  font-size: 11px; color: var(--text-3); letter-spacing: .06em;
  padding: 10px 8px 4px; text-transform: uppercase;
}
.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 9px; border-radius: 8px; cursor: pointer;
  color: var(--text-2); font-size: 13.5px; line-height: 1.4;
  border: 1px solid transparent;
}
.nav-item:hover { background: var(--panel-2); border-color: var(--border); }
.nav-item.on { background: var(--accent-soft); color: var(--accent); border-color: #d5ddfb; font-weight: 600; }
.nav-item .ni-icon { font-size: 15px; width: 18px; text-align: center; flex: 0 0 18px; }
.nav-item .ni-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item .ni-count { font-size: 11px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.nav-item.on .ni-count { color: var(--accent); }
.nav-item .ni-ring { width: 22px; text-align: right; font-size: 10.5px; color: var(--text-3); }

.side-foot { border-top: 1px solid var(--border); padding: 12px; }
.prog-wrap { margin-bottom: 8px; }
.prog-label { display: flex; justify-content: space-between; font-size: 11.5px; color: var(--text-3); margin-bottom: 5px; }
.prog-bar { height: 6px; background: #edeff3; border-radius: 4px; overflow: hidden; }
.prog-bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #3b5bdb, #2f9e44); transition: width .3s; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 22px; background: rgba(245,246,248,.88);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--border);
}
.search-wrap { flex: 1; max-width: 560px; position: relative; }
.search-icon { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--text-3); font-size: 16px; }
#search {
  width: 100%; padding: 8px 12px 8px 32px; font-size: 13.5px; font-family: var(--font);
  border: 1px solid var(--border-strong); border-radius: 8px; background: var(--panel); color: var(--text);
  outline: none;
}
#search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59,91,219,.1); }
.topbar-right { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.seg { display: flex; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; background: var(--panel); }
.seg button {
  border: 0; background: transparent; padding: 6px 14px; font-size: 12.5px;
  cursor: pointer; color: var(--text-2); font-family: var(--font);
}
.seg button.on { background: var(--accent); color: #fff; font-weight: 600; }

.icon-btn { display: none; border: 1px solid var(--border-strong); background: var(--panel); border-radius: 8px; width: 34px; height: 34px; cursor: pointer; font-size: 15px; color: var(--text-2); }

.content { padding: 22px 26px 120px; max-width: 1000px; width: 100%; }

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--border-strong); background: var(--panel); color: var(--text-2);
  padding: 5px 11px; font-size: 12.5px; border-radius: 7px; cursor: pointer;
  font-family: var(--font); transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover { background: #2f4bc0; color: #fff; border-color: #2f4bc0; }
.btn-ghost { border-color: transparent; color: var(--text-3); width: 100%; text-align: center; }
.btn-ghost:hover { color: var(--red); background: var(--red-soft); border-color: transparent; }
.btn-sm { padding: 3px 8px; font-size: 11.5px; }

/* ---------- 通用 ---------- */
.h1 { font-size: 24px; font-weight: 700; margin: 0 0 6px; letter-spacing: -.01em; }
.h2 { font-size: 17px; font-weight: 700; margin: 26px 0 12px; }
.lede { color: var(--text-2); font-size: 14px; margin: 0 0 4px; }
.muted { color: var(--text-3); font-size: 12.5px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- 首页 ---------- */
.hero {
  background: linear-gradient(135deg, #eef1fd 0%, #f7f9ff 55%, #eefafd 100%);
  border: 1px solid #dfe6fb; border-radius: 14px; padding: 24px 26px; margin-bottom: 22px;
}
.hero .h1 { color: #17235c; }
.hero-stats { display: flex; gap: 26px; margin-top: 16px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat b { font-size: 22px; font-weight: 700; color: #17235c; font-variant-numeric: tabular-nums; }
.stat span { font-size: 12px; color: #4b5680; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(285px, 1fr)); gap: 12px; }
.mod-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 15px 16px; cursor: pointer; transition: .15s; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 8px;
}
.mod-card:hover { border-color: #b9c6f5; box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.mod-card-top { display: flex; align-items: center; gap: 9px; }
.mod-card-top .mi { font-size: 18px; }
.mod-card-top strong { font-size: 15px; }
.mod-card p { margin: 0; font-size: 12.8px; color: var(--text-2); line-height: 1.6; }
.mod-card-foot { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 4px; }
.mini-bar { flex: 1; height: 4px; background: #edeff3; border-radius: 3px; overflow: hidden; }
.mini-bar i { display: block; height: 100%; background: var(--green); width: 0; }

/* ---------- 知识点 ---------- */
.points { display: grid; gap: 10px; margin: 14px 0 4px; }
.point {
  background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 12px 15px;
}
.point strong.t { display: block; font-size: 14px; margin-bottom: 3px; color: #17235c; }
.point .d { font-size: 13.2px; color: var(--text-2); line-height: 1.75; }
.point .d strong { color: var(--text); }

/* ---------- 题目 ---------- */
.q-toolbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin: 22px 0 12px; padding: 10px 12px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
}
.chip {
  border: 1px solid var(--border-strong); background: var(--panel-2); color: var(--text-2);
  font-size: 11.8px; padding: 3px 10px; border-radius: 20px; cursor: pointer; font-family: var(--font);
}
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.q-toolbar .spacer { flex: 1; }

.q-item {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 10px; overflow: hidden; box-shadow: var(--shadow);
}
.q-head { display: flex; gap: 11px; align-items: flex-start; padding: 13px 16px; cursor: pointer; }
.q-head:hover { background: var(--panel-2); }
.q-idx {
  flex: 0 0 26px; width: 26px; height: 26px; border-radius: 7px; background: var(--accent-soft);
  color: var(--accent); font-size: 12px; font-weight: 700; display: grid; place-items: center;
  font-variant-numeric: tabular-nums; margin-top: 1px;
}
.q-item.done .q-idx { background: var(--green-soft); color: var(--green); }
.q-body-wrap { flex: 1; min-width: 0; }
.q-text { font-size: 14.5px; font-weight: 600; line-height: 1.6; color: var(--text); }
.q-meta { display: flex; gap: 7px; align-items: center; margin-top: 6px; flex-wrap: wrap; }
.tag {
  font-size: 11px; padding: 1px 7px; border-radius: 5px; background: var(--panel-2);
  border: 1px solid var(--border); color: var(--text-3);
}
.tag.lv-基础 { background: #f1f3f5; color: #5c636a; border-color: #e2e6ea; }
.tag.lv-高频 { background: var(--red-soft); color: #c2255c; border-color: #ffd6e6; }
.tag.lv-进阶 { background: var(--accent-soft); color: #3b5bdb; border-color: #dbe2fb; }
.tag.lv-加分 { background: var(--amber-soft); color: #96690b; border-color: #f2e3b8; }
.q-chev { color: var(--text-3); font-size: 12px; margin-top: 4px; flex: 0 0 auto; transition: transform .2s; }
.q-item.open .q-chev { transform: rotate(90deg); }

.q-answer { display: none; padding: 0 16px 16px 53px; border-top: 1px dashed var(--border); }
.q-item.open .q-answer { display: block; }
.q-answer > :first-child { margin-top: 12px; }
.q-answer p { margin: 8px 0; font-size: 14px; color: var(--text-2); }
.q-answer ul, .q-answer ol { margin: 8px 0; padding-left: 22px; }
.q-answer li { font-size: 14px; color: var(--text-2); margin: 5px 0; line-height: 1.75; }
.q-answer strong { color: var(--text); font-weight: 650; }
.q-answer em { color: var(--accent-2); font-style: normal; font-weight: 600; }
.q-answer h4 { font-size: 14px; margin: 14px 0 6px; color: #17235c; }
.q-answer blockquote {
  margin: 10px 0; padding: 8px 14px; border-left: 3px solid var(--accent-2);
  background: #f0fbfd; color: var(--text-2); font-size: 13.5px; border-radius: 0 6px 6px 0;
}
.q-answer code {
  font-family: var(--mono); font-size: 12.5px; background: var(--code-bg);
  border: 1px solid #e6e9ee; border-radius: 4px; padding: 1px 5px; color: #a23b72;
}
.q-answer pre {
  background: var(--code-bg); border: 1px solid #e3e7ec; border-radius: 8px;
  padding: 13px 15px; overflow-x: auto; margin: 11px 0;
}
.q-answer pre code {
  background: none; border: 0; padding: 0; color: #24292f;
  font-size: 12.4px; line-height: 1.65; white-space: pre;
}
.q-answer table {
  border-collapse: collapse; width: 100%; margin: 11px 0; font-size: 13px;
  border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
}
.q-answer th { background: var(--panel-2); font-weight: 650; text-align: left; }
.q-answer th, .q-answer td { border: 1px solid var(--border); padding: 7px 10px; vertical-align: top; color: var(--text-2); }
.q-answer tr:nth-child(even) td { background: #fcfcfd; }

.q-foot { display: flex; gap: 7px; align-items: center; margin-top: 14px; padding-top: 11px; border-top: 1px dashed var(--border); flex-wrap: wrap; }
.q-foot .spacer { flex: 1; }
.mark-btn.on { background: var(--green-soft); border-color: #b2f2bb; color: var(--green); font-weight: 600; }

/* ---------- 搜索结果 / 自测 ---------- */
.hit { cursor: pointer; }
mark { background: #fff3bf; color: inherit; padding: 0 2px; border-radius: 3px; }
.empty { text-align: center; padding: 60px 20px; color: var(--text-3); }

.quiz-wrap { max-width: 820px; }
.quiz-card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; box-shadow: var(--shadow); }
.quiz-num { font-size: 12px; color: var(--text-3); margin-bottom: 6px; }
.quiz-q { font-size: 17px; font-weight: 650; line-height: 1.6; margin-bottom: 4px; }

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .sidebar {
    position: fixed; left: 0; top: 0; z-index: 60;
    transform: translateX(-100%); transition: transform .22s ease; box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: none; }
  .icon-btn { display: grid; place-items: center; }
  .content { padding: 16px 14px 100px; }
  .topbar { padding: 9px 12px; }
  .q-answer { padding-left: 16px; }
  .topbar-right { display: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .sidebar, .topbar, .q-toolbar, .q-foot, .q-chev { display: none !important; }
  .q-answer { display: block !important; padding-left: 0; }
  .app { display: block; }
  .card, .q-item, .point { box-shadow: none; break-inside: avoid; }
  body { font-size: 12px; }
}