/* ===== 华为 OD 题库 · 浅色主题 ===== */
:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-2: #fafbfe;
  --line: #e4e8f2;
  --line-2: #eef1f8;
  --ink: #1a2233;
  --ink2: #4c5769;
  --ink3: #8892a6;
  --brand: #2f6bff;
  --brand-soft: #eaf1ff;
  --brand-deep: #1f4fd8;
  --ok: #109a5a;
  --ok-soft: #e6f7ee;
  --warn: #b8791a;
  --warn-soft: #fdf3e2;
  --danger: #d14343;
  --danger-soft: #fdecec;
  --code-bg: #f8fafd;
  --shadow: 0 1px 2px rgba(20, 32, 60, .04), 0 8px 24px rgba(20, 32, 60, .05);
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

code, pre, .mono { font-family: var(--mono); }

/* ===== 布局 ===== */
.app {
  display: grid;
  grid-template-columns: 312px minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
}

/* ===== 侧栏 ===== */
.side {
  background: var(--panel);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.side-head {
  padding: 18px 18px 12px;
  border-bottom: 1px solid var(--line-2);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .2px;
}

.brand .logo {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #2f6bff, #6a5bff);
  color: #fff;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 800;
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: 11.5px;
  color: var(--ink3);
  letter-spacing: .3px;
}

.search-wrap {
  margin-top: 14px;
  position: relative;
}

.search-wrap input {
  width: 100%;
  padding: 9px 12px 9px 32px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  font-size: 13px;
  color: var(--ink);
  outline: none;
  transition: .15s;
}

.search-wrap input:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(47, 107, 255, .1);
}

.search-wrap::before {
  content: "";
  position: absolute;
  left: 11px; top: 50%;
  width: 12px; height: 12px;
  transform: translateY(-50%);
  border: 1.8px solid var(--ink3);
  border-radius: 50%;
  opacity: .7;
}

.search-wrap::after {
  content: "";
  position: absolute;
  left: 20px; top: 53%;
  width: 6px; height: 1.8px;
  background: var(--ink3);
  transform: rotate(45deg);
  opacity: .7;
}

.filters {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink2);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: .15s;
  user-select: none;
}

.chip:hover { border-color: #cdd6ea; color: var(--ink); }

.chip.on {
  background: var(--brand-soft);
  border-color: #c9dbff;
  color: var(--brand-deep);
  font-weight: 600;
}

.nav {
  overflow-y: auto;
  padding: 10px 10px 24px;
  flex: 1;
  min-height: 0;
}

.nav::-webkit-scrollbar, .main::-webkit-scrollbar { width: 10px; }
.nav::-webkit-scrollbar-thumb, .main::-webkit-scrollbar-thumb {
  background: #dfe4ef; border-radius: 8px; border: 3px solid transparent; background-clip: content-box;
}

.nav-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink3);
  letter-spacing: .8px;
  padding: 14px 10px 7px;
  text-transform: uppercase;
}

.nav-group-title span.count {
  font-weight: 600;
  color: #b3bccd;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: 9px;
  cursor: pointer;
  color: var(--ink2);
  font-size: 13.2px;
  line-height: 1.4;
  transition: .13s;
}

.nav-item:hover { background: #f4f7fd; color: var(--ink); }

.nav-item.active {
  background: var(--brand-soft);
  color: var(--brand-deep);
  font-weight: 600;
}

.nav-item .idx {
  flex: 0 0 auto;
  width: 20px;
  font-family: var(--mono);
  font-size: 11px;
  color: #aab3c6;
  text-align: right;
}

.nav-item.active .idx { color: var(--brand); }

.nav-item .t {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dots { display: inline-flex; gap: 2px; flex: 0 0 auto; }
.dots i {
  width: 5px; height: 5px; border-radius: 50%;
  background: #dde2ee;
  display: block;
}
.dots i.f1 { background: #6fbf8e; }
.dots i.f2 { background: #e3ab4a; }
.dots i.f3 { background: #e07676; }

.side-foot {
  border-top: 1px solid var(--line-2);
  padding: 10px 16px;
  font-size: 11.5px;
  color: var(--ink3);
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

/* ===== 主体 ===== */
.main {
  overflow-y: auto;
  scroll-behavior: smooth;
  min-width: 0;
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 34px 40px 100px;
}

/* 首页 */
.hero-title {
  font-size: 27px;
  font-weight: 800;
  letter-spacing: -.4px;
  margin: 0 0 8px;
}

.hero-sub {
  color: var(--ink2);
  font-size: 14px;
  margin: 0 0 22px;
  max-width: 640px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 26px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
}

.stat b {
  display: block;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -.5px;
  color: var(--brand-deep);
}

.stat span { font-size: 12px; color: var(--ink3); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.card-link {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition: .15s;
}

.card-link:hover {
  border-color: #c9dbff;
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.card-link .row1 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-link .name { font-weight: 650; font-size: 13.8px; }
.card-link .meta { font-size: 12px; color: var(--ink3); margin-top: 4px; }

/* 题目页头部 */
.q-head { margin-bottom: 22px; }

.crumbs {
  font-size: 12px;
  color: var(--ink3);
  margin-bottom: 10px;
}

.crumbs b { color: var(--ink2); font-weight: 600; }

.q-title {
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -.4px;
  margin: 0 0 10px;
  line-height: 1.3;
}

.q-meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.tag {
  font-size: 11.5px;
  padding: 2.5px 9px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--ink2);
}

.tag.src { background: #f3f5ff; border-color: #dfe5ff; color: #4353b5; }
.tag.d1 { background: var(--ok-soft); border-color: #cbebdb; color: #0d7a48; }
.tag.d2 { background: var(--warn-soft); border-color: #f2dfbd; color: #96631a; }
.tag.d3 { background: var(--danger-soft); border-color: #f6d5d5; color: #b03838; }

/* 章节 */
.sec {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 16px;
}

.sec-h {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 11px;
  border-bottom: 1px dashed var(--line);
}

.sec-h .num {
  width: 20px; height: 20px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-deep);
  display: grid; place-items: center;
  font-size: 11px; font-weight: 800;
  font-family: var(--mono);
}

.sec-body p { margin: 0 0 10px; color: var(--ink2); }
.sec-body p:last-child { margin-bottom: 0; }
.sec-body ul, .sec-body ol { margin: 0 0 10px; padding-left: 20px; color: var(--ink2); }
.sec-body li { margin-bottom: 5px; }
.sec-body strong { color: var(--ink); font-weight: 650; }

.sec-body code {
  background: #f2f5fb;
  border: 1px solid var(--line-2);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 12.5px;
  color: #334;
}

/* 输入输出 */
.io-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.io-box {
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 12px 14px;
}

.io-box h4 {
  margin: 0 0 7px;
  font-size: 12px;
  color: var(--ink3);
  letter-spacing: .6px;
  font-weight: 700;
}

.io-box ul { margin: 0; padding-left: 16px; font-size: 13px; color: var(--ink2); }
.io-box li { margin-bottom: 3px; }

/* 样例 */
.sample {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 12px;
}

.sample:last-child { margin-bottom: 0; }

.sample-h {
  background: var(--panel-2);
  padding: 7px 13px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink3);
  border-bottom: 1px solid var(--line-2);
  display: flex;
  justify-content: space-between;
}

.sample-b {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.sample-b > div { padding: 10px 13px; }
.sample-b > div + div { border-left: 1px solid var(--line-2); }

.sample-b .lbl {
  font-size: 11px;
  color: var(--ink3);
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: 4px;
}

.sample pre {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
}

.sample .note {
  padding: 8px 13px;
  border-top: 1px dashed var(--line-2);
  font-size: 12.5px;
  color: var(--ink3);
  background: #fcfdff;
}

/* 图 */
.figure {
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  border-radius: 12px;
  padding: 14px 12px 10px;
  margin: 14px 0 6px;
  overflow-x: auto;
}

.figure .dg { display: block; width: 100%; height: auto; min-width: 460px; }

.figure .cap {
  margin-top: 9px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  color: var(--ink3);
  text-align: center;
}

/* 步骤 */
.steps { counter-reset: st; list-style: none; padding: 0; margin: 0; }

.steps li {
  counter-increment: st;
  position: relative;
  padding: 0 0 12px 34px;
  font-size: 13.2px;
  color: var(--ink2);
  border-left: 1.5px dashed var(--line);
  margin-left: 10px;
}

.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }

.steps li::before {
  content: counter(st);
  position: absolute;
  left: -11px; top: 1px;
  width: 21px; height: 21px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid #cfdaf3;
  color: var(--brand-deep);
  font-size: 11px;
  font-weight: 800;
  font-family: var(--mono);
  display: grid; place-items: center;
}

.complexity {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.cx {
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  border-radius: 9px;
  padding: 8px 13px;
  font-size: 12.5px;
  color: var(--ink2);
}

.cx b { color: var(--ink); font-family: var(--mono); font-size: 12.5px; }

/* 代码 */
.code-wrap {
  border: 1px solid var(--line);
  border-radius: 11px;
  overflow: hidden;
  background: var(--code-bg);
}

.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 12px;
  background: #f2f5fb;
  border-bottom: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--ink3);
  font-weight: 600;
}

.code-bar .acts { display: flex; gap: 8px; }

.btn-mini {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 7px;
  padding: 3px 10px;
  font-size: 11.5px;
  color: var(--ink2);
  cursor: pointer;
  transition: .14s;
  font-family: inherit;
}

.btn-mini:hover { border-color: var(--brand); color: var(--brand-deep); background: var(--brand-soft); }

pre.code {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 12.7px;
  line-height: 1.72;
  color: #2c3448;
  tab-size: 2;
  max-height: 560px;
}

pre.code::-webkit-scrollbar { height: 9px; width: 9px; }
pre.code::-webkit-scrollbar-thumb { background: #dfe4ef; border-radius: 6px; }

.tok-kw { color: #a626a4; font-weight: 600; }
.tok-str { color: #0a8f4d; }
.tok-num { color: #b3690a; }
.tok-com { color: #93a0b5; font-style: italic; }
.tok-fn  { color: #2a5fd6; }
.tok-type{ color: #0f7f9e; }

/* 演示 */
.demo-box {
  background: var(--panel-2);
  border: 1px solid var(--line-2);
  border-radius: 11px;
  padding: 13px;
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 9px;
  flex-wrap: wrap;
}

.btn-run {
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 7px 16px;
  font-size: 12.8px;
  font-weight: 650;
  cursor: pointer;
  transition: .15s;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-run:hover { background: var(--brand-deep); }
.btn-run:disabled { opacity: .55; cursor: default; }

.demo-hint { font-size: 12px; color: var(--ink3); }

textarea#demo-in {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.6;
  color: var(--ink);
  background: #fff;
  outline: none;
}

textarea#demo-in:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(47,107,255,.1); }

.out-box {
  margin-top: 9px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  overflow: hidden;
}

.out-h {
  padding: 6px 12px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink3);
  background: #f7f9fd;
  border-bottom: 1px solid var(--line-2);
  display: flex;
  justify-content: space-between;
}

.out-b {
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 42px;
  color: var(--ink);
  margin: 0;
}

.out-b.err { color: var(--danger); background: #fffafa; }
.out-b.ok { color: #0b7a49; }
.out-b.idle { color: var(--ink3); font-family: inherit; }

/* 坑点 */
.pit {
  display: flex;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line-2);
  font-size: 13.2px;
  color: var(--ink2);
}

.pit:last-child { border-bottom: none; padding-bottom: 0; }

.pit::before {
  content: "!";
  flex: 0 0 auto;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--warn-soft);
  color: #a06a13;
  font-weight: 800;
  font-size: 11.5px;
  display: grid; place-items: center;
  margin-top: 3px;
}

.pit b { color: var(--ink); }

/* 底部导航 */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 22px;
}

.pager a {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 11px 15px;
  text-decoration: none;
  color: var(--ink2);
  font-size: 12.8px;
  transition: .15s;
  cursor: pointer;
  display: block;
}

.pager a:hover { border-color: #c9dbff; box-shadow: var(--shadow); }
.pager a span { display: block; font-size: 11px; color: var(--ink3); margin-bottom: 2px; }
.pager a.next { text-align: right; }

/* 空状态 */
.empty {
  text-align: center;
  padding: 70px 20px;
  color: var(--ink3);
  font-size: 13.5px;
}

@media (max-width: 1080px) {
  .app { grid-template-columns: 260px minmax(0,1fr); }
  .page { padding: 26px 24px 80px; }
  .stat-row { grid-template-columns: repeat(2,1fr); }
  .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .side { max-height: 46vh; }
  .io-grid, .sample-b { grid-template-columns: 1fr; }
  .sample-b > div + div { border-left: none; border-top: 1px solid var(--line-2); }
}

/* ===== 模拟考 ===== */
.exam-entry {
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 11px;
  border: 1px solid #d3dfff;
  background: linear-gradient(135deg, #f3f7ff, #eef2ff);
  border-radius: 10px;
  cursor: pointer;
  transition: .15s;
}

.exam-entry:hover { border-color: var(--brand); box-shadow: 0 3px 12px rgba(47, 107, 255, .13); }
.ee-icon { font-size: 13px; }
.ee-text { flex: 1; font-size: 12.5px; font-weight: 650; color: var(--brand-deep); }
.ee-text em { display: block; font-style: normal; font-size: 10.8px; font-weight: 400; color: var(--ink3); margin-top: 2px; }
.ee-go { font-size: 11.5px; color: var(--brand); font-weight: 600; }

.exam-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid #d3dfff;
  background: linear-gradient(135deg, #f0f5ff, #f8faff);
  border-radius: 12px;
  margin-bottom: 22px;
  cursor: pointer;
  transition: .15s;
}

.exam-cta:hover { border-color: var(--brand); box-shadow: 0 4px 16px rgba(47, 107, 255, .1); }
.ec-left b { display: block; font-size: 14.5px; color: var(--brand-deep); margin-bottom: 3px; }
.ec-left span { font-size: 12.4px; color: var(--ink2); }
.ec-btn { font-size: 12.5px; font-weight: 650; color: var(--brand-deep); background: #fff; border: 1px solid #cfdcff; border-radius: 8px; padding: 7px 13px; white-space: nowrap; }

body.exam-mode .app { grid-template-columns: minmax(0, 1fr); }
body.exam-mode .side { display: none; }
body.exam-mode .main { overflow: hidden; }

.exam { height: 100%; min-height: 0; display: flex; flex-direction: column; background: var(--bg); }

.ex-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 11px 22px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.ex-brand { font-size: 15px; font-weight: 800; letter-spacing: -.2px; }
.ex-brand span { font-size: 11.5px; font-weight: 500; color: var(--ink3); margin-left: 8px; letter-spacing: 0; }
.ex-clock-wrap { margin-left: auto; display: flex; align-items: baseline; gap: 7px; }
.ex-clock-wrap i { font-style: normal; font-size: 11.5px; color: var(--ink3); }
#ex-clock { font-family: var(--mono); font-size: 20px; font-weight: 700; letter-spacing: .4px; }
#ex-clock.urgent { color: var(--danger); }
.ex-bar-acts { display: flex; align-items: center; gap: 8px; }
.btn-run.armed { background: var(--danger); }

.ex-tabs {
  display: flex;
  gap: 8px;
  padding: 10px 22px;
  background: #fff;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}

.ex-tab {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-2);
  font-size: 12.5px;
  color: var(--ink2);
  cursor: pointer;
  white-space: nowrap;
  transition: .14s;
}

.ex-tab:hover { border-color: #cdd6ea; }
.ex-tab b { font-size: 11.5px; color: var(--ink3); }
.ex-tab em { font-style: normal; font-size: 11px; color: var(--ink3); }
.ex-tab.on { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-deep); font-weight: 650; }
.ex-tab.on b, .ex-tab.on em { color: var(--brand); }
.ex-tab.dirty b::after { content: '●'; font-size: 8px; vertical-align: super; margin-left: 3px; color: var(--ok); }

.ex-body {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: 14px;
  padding: 14px 22px 18px;
}

.ex-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.ex-qpanel { overflow-y: auto; padding: 20px 22px 26px; }
.ex-qpanel::-webkit-scrollbar { width: 9px; }
.ex-qpanel::-webkit-scrollbar-thumb { background: #dfe4ef; border-radius: 6px; }

.ex-crumb { font-size: 11.5px; color: var(--ink3); margin-bottom: 7px; }
.ex-qhead h2 { font-size: 19px; letter-spacing: -.3px; margin: 0 0 9px; }
.ex-desc { font-size: 13.6px; line-height: 1.78; color: var(--ink2); margin: 0 0 16px; }

.ex-io { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.ex-io > div { background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 9px; padding: 10px 12px; }
.ex-io h4 { margin: 0 0 6px; font-size: 11.5px; color: var(--ink3); letter-spacing: .3px; }
.ex-io ul { margin: 0; padding-left: 15px; font-size: 12.4px; line-height: 1.72; color: var(--ink2); }

.ex-case { border: 1px solid var(--line); border-radius: 9px; overflow: hidden; margin-bottom: 10px; }
.ex-case-h { padding: 6px 12px; background: #f2f5fb; border-bottom: 1px solid var(--line); font-size: 11.5px; font-weight: 600; color: var(--ink3); }
.ex-case-b { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line-2); }
.ex-case-b > div { background: #fff; padding: 9px 12px; min-width: 0; }
.ex-case-b span { display: block; font-size: 10.5px; color: var(--ink3); margin-bottom: 4px; }
.ex-case-b pre { margin: 0; font-size: 12px; line-height: 1.6; white-space: pre-wrap; word-break: break-all; color: var(--ink); font-family: var(--mono); }
.ex-note { padding: 6px 12px; font-size: 11.5px; color: var(--ink3); border-top: 1px dashed var(--line-2); }

.ex-codebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  background: #f2f5fb;
  border-bottom: 1px solid var(--line);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink3);
}

.ex-codehint { font-weight: 400; font-size: 10.8px; }

#ex-code {
  flex: 1 1 auto;
  min-height: 160px;
  border: 0;
  outline: none;
  resize: none;
  padding: 12px 14px;
  background: var(--code-bg);
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.72;
  color: #2c3448;
  tab-size: 2;
}

.ex-runbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: var(--panel-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}

.ex-st { font-size: 11.5px; color: var(--ink3); }
.ex-st.ok { color: var(--ok); font-weight: 600; }
.ex-st.bad { color: var(--danger); font-weight: 600; }

#ex-out {
  flex: 0 0 auto;
  min-height: 96px;
  max-height: 240px;
  overflow: auto;
  margin: 0;
  border: 0;
  border-radius: 0;
  font-size: 12px;
  line-height: 1.65;
}

/* 说明页 */
.ex-plan { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-bottom: 24px; background: #fff; }
.ex-plan-row { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-bottom: 1px solid var(--line-2); font-size: 13px; }
.ex-plan-row:last-child { border-bottom: 0; }
.ex-plan-row b { width: 62px; color: var(--ink); }
.ex-plan-row span { color: var(--ink3); flex: 1; }
.ex-plan-row em { font-style: normal; font-weight: 700; color: var(--brand-deep); }
.ex-startrow { display: flex; align-items: center; gap: 14px; margin-top: 22px; }
.ex-startrow span { font-size: 12.5px; color: var(--ink3); }

/* 成绩页 */
.ex-scorecard {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
  background: linear-gradient(135deg, #f7f9ff, #fff);
  margin-bottom: 20px;
}

.ex-scorecard.pass { border-color: #bfe6cf; background: linear-gradient(135deg, #f2fbf6, #fff); }
.ex-scorecard.fail { border-color: #f0d2d2; background: linear-gradient(135deg, #fdf6f6, #fff); }
.ex-score { display: flex; align-items: baseline; gap: 8px; }
.ex-score b { font-size: 46px; font-weight: 800; letter-spacing: -1.5px; color: var(--ink); }
.ex-score span { font-size: 14px; color: var(--ink3); }
.ex-verdict { margin-top: 4px; font-size: 14px; font-weight: 700; color: var(--danger); }
.ex-scorecard.pass .ex-verdict { color: var(--ok); }
.ex-scoremeta { margin-top: 8px; font-size: 12px; color: var(--ink3); }

.ex-rows { display: flex; flex-direction: column; gap: 10px; }
.ex-row { border: 1px solid var(--line); border-radius: 11px; background: #fff; padding: 13px 16px; }
.ex-row-h { display: flex; align-items: center; gap: 10px; }
.ex-row-no { font-size: 11.5px; color: var(--ink3); }
.ex-row-h b { flex: 1; font-size: 14px; }
.ex-row-score { font-family: var(--mono); font-size: 13.5px; font-weight: 700; color: var(--warn); }
.ex-row-score.full { color: var(--ok); }
.ex-row-score.zero { color: var(--danger); }
.ex-row-meta { display: flex; align-items: center; gap: 16px; margin-top: 7px; font-size: 12px; color: var(--ink3); }
.ex-link { color: var(--brand); cursor: pointer; font-weight: 600; }
.ex-link:hover { text-decoration: underline; }

.ex-detail { margin-top: 8px; }
.ex-detail summary { font-size: 12px; color: var(--ink3); cursor: pointer; outline: none; }
.ex-case-line { display: flex; flex-wrap: wrap; gap: 4px 14px; padding: 6px 10px; margin-top: 6px; border-radius: 7px; font-size: 11.8px; background: var(--panel-2); }
.ex-case-line b { font-weight: 700; }
.ex-case-line.ok b { color: var(--ok); }
.ex-case-line.bad b { color: var(--danger); }
.ex-case-line .err { color: var(--danger); font-family: var(--mono); }

.ex-actions { display: flex; gap: 10px; margin-top: 22px; }
.ex-tip { margin-top: 16px; font-size: 11.8px; color: var(--ink3); }

@media (max-width: 1180px) {
  .ex-body { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, 1fr) minmax(240px, .9fr); }
}

.ex-backlink {
  display: inline-block;
  font-size: 12.5px;
  color: var(--brand);
  cursor: pointer;
  margin-bottom: 12px;
  font-weight: 600;
}

.ex-backlink:hover { text-decoration: underline; }