styles.css

/* Agent 工程化课程 · 网页 PPT —— 工程讲义风格 */
:root {
  --paper: #f7f7f2;
  --panel: #ffffff;
  --ink: #23272e;
  --muted: #676e63;
  --line: #dcded2;
  --code-bg: #23272e;
  --code-ink: #e8eadf;
  --acc: #3a6ea5;
  --acc-soft: rgba(58, 110, 165, 0.09);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  overflow: hidden;
}

/* 章节色 */
.c0 { --acc: #23272e; --acc-soft: rgba(35, 39, 46, 0.07); }
.c1 { --acc: #3a6ea5; --acc-soft: rgba(58, 110, 165, 0.09); }
.c2 { --acc: #0f766e; --acc-soft: rgba(15, 118, 110, 0.09); }
.c3 { --acc: #b4560f; --acc-soft: rgba(180, 86, 15, 0.09); }
.c4 { --acc: #34773d; --acc-soft: rgba(52, 119, 61, 0.09); }

/* ===== 页头与进度 ===== */
.top {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  z-index: 20;
  font-size: 13px;
}
.top .brand {
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.08em;
}
.top .meta { display: flex; gap: 12px; color: var(--muted); align-items: center; }
.top .meta .chip {
  font-size: 12px;
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
#counter { font-variant-numeric: tabular-nums; }

.progress {
  position: fixed;
  top: 52px; left: 0; right: 0;
  height: 3px;
  background: var(--line);
  z-index: 20;
}
#bar { height: 100%; width: 0; background: #3a6ea5; transition: width 0.25s ease; }

/* ===== 幻灯片 ===== */
.deck { position: absolute; inset: 55px 0 0 0; outline: none; }

.slide {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  padding: 30px 64px 56px;
  background: var(--paper);
}
.slide.active { display: flex; }

.s-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 2px solid var(--acc);
  flex: none;
}
.s-ch {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--acc);
  font-weight: 600;
}
.s-sec { font-size: 12px; color: var(--muted); letter-spacing: 0.06em; }

.s-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding-bottom: 8px;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.25;
  text-wrap: balance;
  margin-bottom: 18px;
}
h2 {
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.3;
  text-wrap: balance;
  margin-bottom: 14px;
}
h3 {
  font-size: 16px;
  margin: 14px 0 8px;
  color: var(--acc);
}
.s-body > p, .col > p { max-width: 68ch; }

.lead { font-size: 17px; color: var(--muted); max-width: 62ch; margin-bottom: 16px; }
.eyebrow {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--acc);
  font-weight: 600;
  margin-bottom: 12px;
}
strong { color: var(--acc); }

.thesis {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.7;
  border-left: 4px solid var(--acc);
  padding: 6px 0 6px 18px;
  margin: 14px 0;
  max-width: 62ch;
}

/* 布局 */
.cols { display: grid; gap: 28px; align-items: start; }
.cols-2 { grid-template-columns: 3fr 2fr; }
.cols-21 { grid-template-columns: 2fr 1fr; }
.cols-11 { grid-template-columns: 1fr 1fr; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }

ul.tight { list-style: none; }
ul.tight li {
  padding: 7px 0 7px 20px;
  position: relative;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
}
ul.tight li::before {
  content: "";
  position: absolute;
  left: 2px; top: 16px;
  width: 8px; height: 8px;
  border: 2px solid var(--acc);
  border-radius: 2px;
}
ul.tight li:last-child { border-bottom: none; }

ol.steps { list-style: none; counter-reset: st; }
ol.steps li {
  counter-increment: st;
  padding: 8px 0 8px 40px;
  position: relative;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
}
ol.steps li::before {
  content: counter(st, decimal-leading-zero);
  position: absolute;
  left: 0; top: 9px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  font-weight: 700;
}
ol.steps li:last-child { border-bottom: none; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px 18px;
}
.card .k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--acc);
  font-weight: 700;
  margin-bottom: 6px;
}
.card p { font-size: 14px; }
.card-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin: 14px 0; }

.good { border-top: 3px solid #34773d; }
.bad { border-top: 3px solid #b0432f; }
.good .k { color: #34773d; }
.bad .k { color: #b0432f; }

/* 表格 */
.tbl { overflow-x: auto; margin: 12px 0; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 8px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--acc);
  background: var(--acc-soft);
  white-space: nowrap;
}
tr:last-child td { border-bottom: none; }
td code, li code, p code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--acc-soft);
  padding: 1px 5px;
  border-radius: 3px;
}

/* 代码块 */
pre.code {
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  padding: 14px 18px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 12px 0;
}
pre.code .cm { color: #8a917d; }

/* 流程链 */
.chain { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 14px 0; }
.chain span {
  background: var(--panel);
  border: 1px solid var(--acc);
  color: var(--ink);
  border-radius: 4px;
  padding: 6px 12px;
  font-size: 14px;
}
.chain i { color: var(--acc); font-style: normal; font-weight: 700; }
.chain span.hot { background: var(--acc); color: #fff; border-color: var(--acc); }

/* 配图占位 */
.fig {
  border: 2px dashed var(--acc);
  border-radius: 8px;
  background: var(--acc-soft);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 120px;
}
.fig .fig-mark {
  font-size: 11px;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--acc);
}
.fig .fig-mark::before { content: "▣ "; }
.fig p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}
.fig.tall { min-height: 300px; justify-content: flex-start; }

/* 成品配图 */
.ill {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
  align-self: start;
}
.ill img { width: 100%; display: block; }
.ill.tall { max-width: 460px; justify-self: center; }
figure.ill { margin: 0; }

/* 章封面 */
.slide.cover { justify-content: center; }
.slide.cover .s-body { display: grid; grid-template-columns: 3fr 2fr; gap: 48px; align-items: center; overflow: visible; }
.cover-no {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--acc);
  letter-spacing: 0.3em;
  margin-bottom: 14px;
}
.slide.cover h1 { margin-bottom: 20px; }

/* 目录 */
.toc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 10px; }
.toc-item {
  border: 1px solid var(--line);
  background: var(--panel);
  border-left: 5px solid var(--tc, #3a6ea5);
  border-radius: 6px;
  padding: 16px 20px;
}
.toc-item .no { font-family: var(--mono); font-size: 12px; color: var(--tc); }
.toc-item h3 { font-family: var(--serif); font-size: 19px; color: var(--ink); margin: 4px 0 6px; }
.toc-item p { font-size: 13px; color: var(--muted); }

/* 附注 */
.note {
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 10px;
  max-width: 75ch;
}

/* 底部提示 */
.hint {
  position: fixed;
  bottom: 14px; left: 0; right: 0;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  z-index: 20;
  pointer-events: none;
}

/* 目录浮层 */
.overlay {
  position: fixed; inset: 0;
  background: rgba(35, 39, 46, 0.5);
  z-index: 40;
  display: none;
  align-items: center;
  justify-content: center;
}
.overlay.open { display: flex; }
.overlay-panel {
  background: var(--paper);
  border-radius: 10px;
  max-width: 820px;
  width: 92%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 28px 32px;
}
.overlay-panel h2 { margin-bottom: 12px; }
.ov-list { columns: 2; column-gap: 28px; font-size: 13px; }
.ov-list a {
  display: block;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px dashed var(--line);
  break-inside: avoid;
}
.ov-list a:hover { color: #3a6ea5; }
.ov-list a .n { font-family: var(--mono); color: var(--muted); margin-right: 8px; font-size: 11px; }

button.nav-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  font-size: 12px;
  padding: 3px 12px;
  cursor: pointer;
  font-family: var(--sans);
}
button.nav-btn:hover, button.nav-btn:focus-visible { border-color: #3a6ea5; color: #3a6ea5; outline: none; }

@media (prefers-reduced-motion: reduce) {
  #bar { transition: none; }
}

@media (max-width: 900px) {
  .slide { padding: 22px 22px 48px; }
  .cols-2, .cols-21, .cols-11, .cols-3, .slide.cover .s-body { grid-template-columns: 1fr; }
  .toc-grid { grid-template-columns: 1fr; }
  .ov-list { columns: 1; }
}