/* ==========================================================================
   信息系统项目管理师（高项）学习教程 —— 统一样式表
   适用：《信息系统项目管理师教程（第4版）》 / 2022审定版大纲
   ========================================================================== */

:root {
  --brand: #0f766e;
  --brand-dk: #0b5a54;
  --brand-lt: #e6f4f2;
  --accent: #ea580c;
  --accent-lt: #fff3ea;
  --ink: #1b2430;
  --ink-2: #3d4a5c;
  --ink-3: #6b7a8d;
  --line: #e2e8f0;
  --line-2: #cfd8e3;
  --bg: #f5f7fa;
  --card: #ffffff;
  --ok: #15803d;
  --ok-bg: #eaf7ee;
  --bad: #b91c1c;
  --bad-bg: #fdeeee;
  --info: #1d4ed8;
  --info-bg: #eef3fe;
  --warn: #b45309;
  --warn-bg: #fef6e7;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 30, 54, .06), 0 6px 18px rgba(16, 30, 54, .06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    Roboto, Helvetica, Arial, sans-serif;
  font-size: 15.5px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 顶部导航条 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 22px;
  background: linear-gradient(90deg, var(--brand-dk), var(--brand) 60%, #12897f);
  color: #fff;
  box-shadow: 0 2px 10px rgba(11, 90, 84, .25);
}
.topbar .logo { font-weight: 700; letter-spacing: .4px; font-size: 16px; }
.topbar .logo span { color: #ffd9a8; }
.topbar .crumb { font-size: 13px; color: rgba(255, 255, 255, .82); }
.topbar .spacer { flex: 1; }
.topbar a {
  color: #fff;
  text-decoration: none;
  font-size: 13.5px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 999px;
  white-space: nowrap;
}
.topbar a:hover { background: rgba(255, 255, 255, .16); }

/* ---------- 布局 ---------- */
.layout {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  gap: 26px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 22px 70px;
}
.layout.full { grid-template-columns: minmax(0, 1fr); max-width: 1180px; }

.sidebar {
  position: sticky;
  top: 62px;
  align-self: start;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 14px 18px;
  box-shadow: var(--shadow);
  font-size: 13.5px;
}
.sidebar h3 {
  margin: 14px 4px 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-3);
  font-weight: 700;
  text-transform: uppercase;
}
.sidebar h3:first-child { margin-top: 4px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 1px 0; }
.sidebar a {
  display: block;
  padding: 5px 9px;
  border-radius: 6px;
  color: var(--ink-2);
  text-decoration: none;
  line-height: 1.45;
}
.sidebar a:hover { background: var(--brand-lt); color: var(--brand-dk); }
.sidebar a.cur { background: var(--brand); color: #fff; font-weight: 600; }

/* ---------- 内容区 ---------- */
.content { min-width: 0; }

.chapter-header {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 5px solid var(--brand);
  border-radius: var(--radius);
  padding: 22px 26px;
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}
.chapter-kicker {
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
}
.chapter-header h1 { margin: 6px 0 8px; font-size: 27px; line-height: 1.35; }
.chapter-header .lede { margin: 0; color: var(--ink-2); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 26px 22px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

h2.sec {
  font-size: 20px;
  margin: 30px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--brand);
  line-height: 1.4;
}
h2.sec:first-child { margin-top: 4px; }
h3.sub { font-size: 16.5px; margin: 22px 0 8px; color: var(--brand-dk); }
h4.subsub { font-size: 15px; margin: 16px 0 6px; color: var(--ink); }
p { margin: 9px 0; }
ul, ol { margin: 9px 0; padding-left: 22px; }
li { margin: 4px 0; }

strong, b { color: #0b1220; }
mark {
  background: #fff1c9;
  color: inherit;
  padding: 1px 4px;
  border-radius: 4px;
}
code {
  background: #eef2f7;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  font-family: "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: .9em;
  color: #0b4f6c;
}

/* ---------- 提示框 ---------- */
.box {
  border: 1px solid var(--line-2);
  border-left: 4px solid var(--ink-3);
  background: #fbfcfe;
  border-radius: 8px;
  padding: 13px 17px;
  margin: 15px 0;
  font-size: 14.6px;
}
.box .box-title {
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: .04em;
  margin-bottom: 6px;
  display: block;
}
.box p:first-of-type { margin-top: 0; }
.box p:last-child, .box ul:last-child, .box ol:last-child { margin-bottom: 0; }

.box.tip      { border-left-color: var(--info); background: var(--info-bg); }
.box.tip .box-title { color: var(--info); }
.box.exam     { border-left-color: var(--accent); background: var(--accent-lt); }
.box.exam .box-title { color: var(--accent); }
.box.case     { border-left-color: #7c3aed; background: #f5f1ff; }
.box.case .box-title { color: #6d28d9; }
.box.warn     { border-left-color: var(--warn); background: var(--warn-bg); }
.box.warn .box-title { color: var(--warn); }
.box.mnemonic { border-left-color: var(--brand); background: var(--brand-lt); }
.box.mnemonic .box-title { color: var(--brand-dk); }
.box.ok       { border-left-color: var(--ok); background: var(--ok-bg); }
.box.ok .box-title { color: var(--ok); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; margin: 15px 0; }
table.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.3px;
  background: #fff;
}
table.tbl th, table.tbl td {
  border: 1px solid var(--line-2);
  padding: 8px 11px;
  text-align: left;
  vertical-align: top;
}
table.tbl thead th {
  background: #eef4f3;
  color: var(--brand-dk);
  font-weight: 700;
  white-space: nowrap;
}
table.tbl tbody tr:nth-child(even) { background: #fafbfd; }
table.tbl td.c, table.tbl th.c { text-align: center; white-space: nowrap; }

/* ---------- 考情卡片 ---------- */
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 12px;
  margin: 16px 0 6px;
}
.meta-card {
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  border-radius: 8px;
  padding: 12px 14px;
}
.meta-card .k { font-size: 12.5px; color: var(--ink-3); letter-spacing: .04em; }
.meta-card .v { font-size: 19px; font-weight: 700; color: var(--brand-dk); line-height: 1.4; }
.meta-card .v small { font-size: 12.5px; font-weight: 500; color: var(--ink-3); }

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--brand-lt);
  color: var(--brand-dk);
  border: 1px solid #b9ded9;
  margin-right: 6px;
}
.badge.hot { background: #ffe8e3; color: #b91c1c; border-color: #f6c4bb; }
.badge.mid { background: var(--accent-lt); color: var(--accent); border-color: #f8cdae; }
.badge.low { background: #eef1f5; color: var(--ink-3); border-color: var(--line-2); }

/* ---------- 公式 ---------- */
.formula {
  background: #f2f6fb;
  border: 1px dashed #b9c9dd;
  border-radius: 8px;
  padding: 11px 15px;
  margin: 12px 0;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 14.2px;
  line-height: 1.95;
  overflow-x: auto;
}
.formula b { color: #0b4f6c; }
.formula .note { font-family: inherit; color: var(--ink-3); font-size: 13px; }

/* ---------- 测试题 ---------- */
.quiz-intro {
  background: linear-gradient(135deg, #0f766e, #12897f);
  color: #fff;
  border-radius: var(--radius);
  padding: 18px 24px;
  margin: 22px 0 18px;
}
.quiz-intro h2 { margin: 0 0 6px; font-size: 20px; border: 0; padding: 0; color: #fff; }
.quiz-intro p { margin: 4px 0; color: rgba(255, 255, 255, .9); font-size: 14.3px; }

.q {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 15px 18px;
  margin: 13px 0;
}
.q-stem { font-weight: 600; margin: 0 0 8px; }
.q-stem .qno {
  display: inline-block;
  min-width: 30px;
  font-weight: 700;
  color: var(--brand);
}
.q-source { font-size: 12.6px; color: var(--ink-3); font-weight: 400; margin-left: 6px; }
.q-opts { margin: 6px 0 0; padding-left: 30px; }
.q-opts .opt { margin: 3px 0; }
.q-opts .opt b { color: var(--brand-dk); margin-right: 4px; }

details.ans {
  margin-top: 11px;
  border: 1px solid var(--line-2);
  border-radius: 7px;
  background: #f8fafc;
  overflow: hidden;
}
details.ans > summary {
  cursor: pointer;
  padding: 8px 14px;
  font-size: 13.6px;
  font-weight: 700;
  color: var(--brand-dk);
  background: #eef4f3;
  list-style: none;
  user-select: none;
}
details.ans > summary::-webkit-details-marker { display: none; }
details.ans > summary::before { content: "▸ "; font-weight: 700; }
details.ans[open] > summary::before { content: "▾ "; }
details.ans[open] > summary { border-bottom: 1px solid var(--line-2); }
.ans-body { padding: 12px 15px 14px; font-size: 14.4px; }
.ans-body p { margin: 7px 0; }
.ans-body .k {
  font-weight: 700;
  color: var(--ink);
}
.ans-body .right { color: var(--ok); font-weight: 700; }
.ans-body .wrong { color: var(--bad); font-weight: 700; }
.ans-body ul { padding-left: 20px; }
.ans-body .verdict {
  background: var(--ok-bg);
  border-left: 3px solid var(--ok);
  border-radius: 5px;
  padding: 8px 12px;
  margin: 9px 0;
  font-weight: 600;
  color: #14532d;
}
.ans-body .trap {
  background: var(--bad-bg);
  border-left: 3px solid var(--bad);
  border-radius: 5px;
  padding: 8px 12px;
  margin: 9px 0;
  color: #7f1d1d;
}

/* ---------- 翻页 ---------- */
.pager {
  display: flex;
  gap: 14px;
  margin: 30px 0 10px;
}
.pager a {
  flex: 1;
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 12px 17px;
  text-decoration: none;
  color: var(--ink-2);
  font-size: 14px;
  box-shadow: var(--shadow);
}
.pager a:hover { border-color: var(--brand); color: var(--brand-dk); }
.pager a .dir { display: block; font-size: 12px; color: var(--ink-3); }
.pager a.next { text-align: right; }

/* ---------- 首页专用 ---------- */
.hero {
  background: linear-gradient(135deg, #0b5a54 0%, #0f766e 45%, #12897f 100%);
  color: #fff;
  border-radius: 14px;
  padding: 40px 42px 36px;
  margin-bottom: 24px;
  box-shadow: 0 12px 34px rgba(11, 90, 84, .28);
}
.hero .tag {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .16em;
  font-weight: 700;
  color: #ffd9a8;
  border: 1px solid rgba(255, 217, 168, .5);
  border-radius: 999px;
  padding: 3px 13px;
  margin-bottom: 14px;
}
.hero h1 { margin: 0 0 12px; font-size: 34px; line-height: 1.3; }
.hero p { color: rgba(255, 255, 255, .9); margin: 8px 0; max-width: 780px; }
.hero .hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-top: 24px;
}
.hero .hero-stats div {
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 9px;
  padding: 11px 15px;
}
.hero .hero-stats .n { font-size: 22px; font-weight: 700; }
.hero .hero-stats .l { font-size: 12.6px; color: rgba(255, 255, 255, .82); }

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin: 16px 0;
}
.ch-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 9px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform .14s ease, box-shadow .14s ease;
}
.ch-card:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(16, 30, 54, .12); }
.ch-card .no { font-size: 12.4px; color: var(--accent); font-weight: 700; letter-spacing: .08em; }
.ch-card .nm { font-size: 15.6px; font-weight: 700; margin: 3px 0 5px; color: var(--brand-dk); }
.ch-card .ds { font-size: 13.2px; color: var(--ink-3); line-height: 1.6; }
.ch-card .ft { margin-top: 8px; font-size: 12.4px; color: var(--ink-3); }

.part-title {
  margin: 30px 0 4px;
  font-size: 18px;
  font-weight: 700;
  color: var(--brand-dk);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--brand-lt);
}
.part-title small { color: var(--ink-3); font-weight: 400; font-size: 13px; margin-left: 8px; }

.toc-list { list-style: none; padding: 0; margin: 10px 0; }
.toc-list li {
  padding: 7px 0 7px 4px;
  border-bottom: 1px dashed var(--line-2);
  font-size: 14.4px;
}
.toc-list li a { color: var(--brand-dk); text-decoration: none; font-weight: 600; }
.toc-list li a:hover { text-decoration: underline; }
.toc-list li .hl { color: var(--accent); font-weight: 700; font-size: 12.8px; }

footer.site {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 22px 46px;
  color: var(--ink-3);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .layout { grid-template-columns: minmax(0, 1fr); padding: 16px 14px 60px; }
  .sidebar { position: static; max-height: none; }
  .hero { padding: 28px 22px; }
  .hero h1 { font-size: 26px; }
  .card { padding: 16px 17px; }
  .chapter-header { padding: 18px 17px; }
  .chapter-header h1 { font-size: 22px; }
}

/* ---------- 打印 ---------- */
@media print {
  .topbar, .sidebar, .pager { display: none; }
  body { background: #fff; font-size: 11.5pt; }
  .layout, .layout.full { grid-template-columns: 1fr; max-width: none; padding: 0; }
  .card, .chapter-header { box-shadow: none; border-color: #bbb; break-inside: avoid; }
  details.ans { break-inside: avoid; }
  details.ans > summary { display: none; }
  details.ans > .ans-body { padding: 6px 10px; }
}