:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --ink: #17212b;
  --muted: #5d6975;
  --line: #d8e0e8;
  --line-strong: #b8c5d2;
  --green: #2f735f;
  --green-soft: #e9f5f0;
  --blue: #2f5f99;
  --blue-soft: #eaf2fb;
  --red: #b43d36;
  --red-soft: #fff0ee;
  --amber: #a76612;
  --amber-soft: #fff4df;
  --shadow: 0 10px 26px rgba(27, 39, 52, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

button,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 3px;
  font-size: 1.28rem;
  line-height: 1.25;
}

h2 {
  margin-bottom: 0;
  font-size: 1.02rem;
}

h3 {
  margin-bottom: 6px;
  font-size: 0.98rem;
}

p {
  margin-bottom: 0;
  color: var(--muted);
}

pre {
  overflow: auto;
  margin: 8px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f3f6f9;
  padding: 9px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.84rem;
  line-height: 1.45;
}

.paper-app {
  width: min(1500px, calc(100% - 24px));
  margin: 0 auto;
  padding: 14px 0 28px;
}

.paper-top,
.panel-block,
.page-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.paper-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
  padding: 14px 16px;
}

.top-actions,
.panel-head,
.choice-row,
.judge-row,
.judge-result,
.result-line {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-actions {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  padding: 7px 13px;
  font-weight: 800;
  text-decoration: none;
}

.btn.primary {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.paper-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 12px;
  align-items: start;
}

.page-list {
  display: grid;
  gap: 12px;
}

.page-card {
  overflow: hidden;
  padding: 10px;
}

.page-card img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.answer-panel {
  position: sticky;
  top: 12px;
  display: grid;
  max-height: calc(100vh - 24px);
  overflow: auto;
  gap: 10px;
}

.panel-block {
  padding: 12px;
}

.panel-head {
  justify-content: space-between;
  margin-bottom: 10px;
}

.panel-head span,
.panel-head strong {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 900;
}

.answer-grid {
  display: grid;
  gap: 8px;
}

.choice-row,
.judge-row {
  flex-wrap: wrap;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  padding: 7px;
}

.choice-row > strong,
.judge-row > strong {
  width: 30px;
  flex: 0 0 auto;
}

.choice-row label,
.judge-row label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 48px;
  font-weight: 800;
}

.choice-row.correct,
.judge-row.correct {
  border-color: rgba(47, 115, 95, 0.45);
  background: var(--green-soft);
}

.choice-row.wrong,
.judge-row.wrong {
  border-color: rgba(180, 61, 54, 0.5);
  background: var(--red-soft);
}

.correct-note {
  width: 100%;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.program-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  padding: 10px;
}

.program-card + .program-card {
  margin-top: 10px;
}

.program-meta {
  display: grid;
  gap: 6px;
  margin: 8px 0;
}

.program-meta p {
  color: var(--ink);
  font-size: 0.9rem;
}

.code-editor {
  width: 100%;
  min-height: 230px;
  resize: vertical;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #111827;
  color: #e5edf5;
  padding: 12px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.88rem;
  line-height: 1.5;
  tab-size: 4;
}

.judge-result {
  justify-content: space-between;
  margin-top: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 8px;
}

.judge-result.accepted {
  border-color: rgba(47, 115, 95, 0.45);
  background: var(--green-soft);
}

.judge-result.unaccepted {
  border-color: rgba(180, 61, 54, 0.45);
  background: var(--red-soft);
}

.judge-result.compile-error {
  border-color: rgba(167, 102, 18, 0.45);
  background: var(--amber-soft);
}

.test-list {
  display: grid;
  gap: 6px;
  margin-top: 8px;
}

.test-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 6px 8px;
  font-size: 0.84rem;
}

.test-row strong {
  color: var(--red);
  text-align: right;
}

.test-row.pass strong {
  color: var(--green);
}

.result-block {
  border-color: rgba(47, 115, 95, 0.38);
  background: var(--green-soft);
}

.result-block h2 {
  color: var(--green);
  font-size: 1.5rem;
}

.result-line {
  justify-content: space-between;
  color: #355247;
  font-weight: 800;
}

@media (max-width: 1080px) {
  .paper-layout {
    grid-template-columns: 1fr;
  }

  .answer-panel {
    position: static;
    max-height: none;
  }
}

@media (max-width: 640px) {
  .paper-app {
    width: min(100% - 14px, 1500px);
    padding-top: 8px;
  }

  .paper-top {
    align-items: stretch;
    flex-direction: column;
  }

  .top-actions {
    justify-content: flex-start;
  }

  .choice-row label,
  .judge-row label {
    min-width: 42px;
  }
}