/* Easel 架构课程 · 共享样式 —— Tufte 风格，可打印 */
:root {
  --accent: #F05A3C;        /* Easel 品牌橙 */
  --ink: #1a1a1a;
  --paper: #fffdf9;
  --muted: #6b6b6b;
  --rule: #e5ded4;
  --code-bg: #f4f0e9;
}

* { box-sizing: border-box; }

body {
  font-family: "Charter", "Georgia", "Songti SC", "Noto Serif CJK SC", serif;
  color: var(--ink);
  background: var(--paper);
  max-width: 46rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  line-height: 1.75;
  font-size: 1.06rem;
}

header.course {
  border-bottom: 3px double var(--rule);
  padding-bottom: 0.8rem;
  margin-bottom: 2.2rem;
}
header.course .kicker {
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0.4rem 0 0.3rem; }
h2 {
  font-size: 1.25rem;
  margin: 2.6rem 0 0.8rem;
  padding-left: 0.6rem;
  border-left: 4px solid var(--accent);
}
p { margin: 0.7rem 0; }

code, .mono {
  font-family: "SF Mono", ui-monospace, "JetBrains Mono", monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.55;
}
pre code { background: none; padding: 0; }

table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: 0.92rem; }
th, td { border: 1px solid var(--rule); padding: 0.5rem 0.7rem; text-align: left; vertical-align: top; }
th { background: #f7f2ea; font-size: 0.85rem; }

.verdict {
  border: 1.5px solid var(--accent);
  border-radius: 10px;
  padding: 1rem 1.3rem;
  margin: 1.4rem 0;
  background: #fff6f2;
}
.verdict strong { color: var(--accent); }

aside.note {
  font-size: 0.88rem;
  color: var(--muted);
  border-left: 2px solid var(--rule);
  padding-left: 0.9rem;
  margin: 1rem 0;
}

.src { font-size: 0.8rem; color: var(--muted); font-family: "SF Mono", ui-monospace, monospace; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }

footer.nav {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 3px double var(--rule);
  font-size: 0.85rem;
  color: var(--muted);
}

/* 测验组件 */
.quiz { margin: 1.6rem 0; padding: 1.1rem 1.3rem; border: 1px solid var(--rule); border-radius: 10px; background: #fff; }
.quiz .q { font-weight: 600; margin-bottom: 0.7rem; }
.quiz .opt {
  display: block; width: 100%; text-align: left;
  font: inherit; font-size: 0.95rem;
  padding: 0.5rem 0.8rem; margin: 0.35rem 0;
  border: 1px solid var(--rule); border-radius: 8px;
  background: var(--paper); cursor: pointer;
}
.quiz .opt:hover { border-color: var(--accent); }
.quiz .opt.correct { border-color: #2e7d32; background: #f0f7f0; }
.quiz .opt.wrong { border-color: #c62828; background: #fdf1f0; }
.quiz .why { font-size: 0.85rem; color: var(--muted); margin-top: 0.6rem; min-height: 1.2rem; }
.quiz .opt:disabled { cursor: default; }

@media print {
  body { max-width: none; padding: 0; font-size: 10.5pt; }
  .quiz { page-break-inside: avoid; }
  a { color: var(--ink); }
}