/* ============================================================
   Tech Stack Map · 学习台
   风格：编辑粗野主义 / 数字杂志档案
   配色：纸白 + 墨黑 + 砖红 + 浅灰
   ============================================================ */

:root {
  --paper:  #f4f2ed;   /* 纸面 */
  --ink:    #1a1a1a;   /* 墨黑 */
  --red:    #b3261e;   /* 砖红（强调） */
  --gray:   #d8d3c8;   /* 浅灰（分隔线、网格） */
  --muted:  #6b6660;   /* 次级文字 */
  --serif:  Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 80px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 15px;      /* 正文 15px */
  line-height: 1.9;     /* 行高 1.9 */
  -webkit-font-smoothing: antialiased;
}

/* 页面主容器：限制行宽，保持杂志的窄栏阅读感 */
main, .masthead, .colophon {
  max-width: 820px;
  margin: 0 auto;
}

/* ---------- 报头 ---------- */
.masthead {
  padding: 40px 0 18px;
  border-bottom: 3px solid var(--ink);
}

.kicker {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--red);
}

.masthead__title {
  margin: 0;
  font-size: clamp(40px, 9vw, 76px);
  line-height: 1;
  letter-spacing: -.02em;
  font-weight: 700;
}

.deck {
  margin: 14px 0 0;
  font-style: italic;
  color: var(--muted);
  max-width: 62ch;
}

/* 目录：小号全大写 + 竖线分隔 */
.toc {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
}

.toc a {
  color: var(--ink);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
}
.toc a:hover { border-bottom-color: var(--red); color: var(--red); }
.toc a + a::before {
  content: "/";
  margin: 0 12px;
  color: var(--gray);
}

/* ---------- 区块 ---------- */
.block {
  padding: 52px 0 8px;
  border-bottom: 1px solid var(--gray);
  scroll-margin-top: 24px;   /* 点目录跳过来时，别把标题贴在视口最顶上 */
}

.block__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.block__title {
  margin: 0;
  font-size: 27px;
  letter-spacing: -.01em;
}

.block__note {
  margin: 0;
  max-width: 46ch;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}
.block__note em { color: var(--red); font-style: italic; }

/* ---------- 进度条 ---------- */
.bar {
  height: 6px;
  background: var(--gray);
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--ink);
  transition: width .35s ease;
}
.bar--thick { height: 12px; }
.bar--thick > span { background: var(--red); }

/* 总进度 */
.overall {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  margin: 26px 0 34px;
}
.overall__label {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.overall__pct {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 3.6ch;
  text-align: right;
}

/* ---------- 阶段卡片 ---------- */
.stages {
  display: grid;
  grid-template-columns: 1fr 1fr;   /* 宽屏两列 */
  gap: 22px;
}

.stage {
  border: 1.5px solid var(--ink);
  padding: 16px 18px 18px;
  background: #fbfaf7;
  box-shadow: 5px 5px 0 var(--ink);   /* 粗野主义的硬阴影 */
}

.stage__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.stage__name {
  margin: 0;
  font-size: 17px;
  line-height: 1.5;
}

.stage__no {
  display: block;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--red);
}

.stage__pct {
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

/* 勾选列表 */
.checks {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  font-size: 13.5px;
  line-height: 1.55;
}
.checks li { margin-bottom: 7px; }
.checks label {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  cursor: pointer;
}
.checks input {
  margin-top: 4px;
  accent-color: var(--red);
  flex: none;
}

/* ---------- 点积实验室 ---------- */
.lab {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  margin-top: 26px;
  align-items: start;
}

.lab__controls { display: grid; gap: 12px; }

.field { display: grid; gap: 4px; }
.field label {
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input {
  font-family: var(--serif);
  font-size: 16px;
  padding: 8px 10px;
  border: 1.5px solid var(--ink);
  background: #fbfaf7;
  color: var(--ink);
}
.field input:focus {
  outline: 2px solid var(--red);
  outline-offset: -1px;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}
.presets button,
.drawbar button {
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: .06em;
  padding: 6px 11px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.presets button:hover,
.drawbar button:hover { background: var(--ink); color: var(--paper); }
.presets button:active,
.drawbar button:active { transform: translate(1px, 1px); }

.lab__canvas { text-align: center; }
#plot {
  width: 100%;
  max-width: 300px;
  border: 1.5px solid var(--ink);
  background: #fbfaf7;
}

.lab__legend {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.key {
  display: inline-block;
  width: 18px;
  height: 3px;
  vertical-align: middle;
  margin-right: 4px;
}
.key--a { background: var(--red); }
.key--b { background: var(--ink); }

/* 读数 */
.readout {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 1.5px solid var(--ink);
  margin: 26px 0 0;
}
.readout > div {
  background: #fbfaf7;
  padding: 10px 12px;
}
.readout dt {
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2px;
}
.readout dd {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* 结论条 */
.verdict {
  margin: 16px 0 0;
  padding: 10px 14px;
  border-left: 4px solid var(--red);
  background: #fbfaf7;
  font-size: 14px;
}

/* ---------- 复习卡 ---------- */
.flashes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 26px;
}

.flash {
  border: 1.5px solid var(--ink);
  background: #fbfaf7;
  padding: 16px 18px 18px;
  cursor: pointer;
  position: relative;
}

.flash__tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--red);
}

.flash__q {
  margin: 0;
  font-size: 18px;
  line-height: 1.55;
  font-weight: 700;
}

/* 答案默认折叠：JS 加上 .is-open 后展开 */
.flash__a {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .3s ease, opacity .3s ease, margin .3s ease;
  font-size: 14px;
  color: #33302c;
}
.flash.is-open .flash__a {
  max-height: 320px;
  opacity: 1;
  margin-top: 12px;
}
.flash.is-open { box-shadow: 5px 5px 0 var(--red); }

/* 提示小三角 */
.flash::after {
  content: "点开 +";
  position: absolute;
  right: 16px;
  bottom: 10px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}
.flash.is-open::after { content: "收起 –"; }

/* ---------- 抽卡工具条 ---------- */
.drawbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}
.drawbar button { padding: 8px 16px; font-size: 13px; }
.drawbar__count {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* 被抽到过的卡片：描边变红 + 角标记号 */
.flash.is-drawn { border-color: var(--red); }
.flash.is-drawn .flash__tag::after {
  content: " · 抽到过";
  color: var(--muted);
  letter-spacing: .04em;
}

/* ---------- 笔记档案 ---------- */
.archive {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 28px;
  margin-top: 26px;
  align-items: start;
}

/* 左栏目录：粘住不动，自己内部滚动 */
.archive__toc {
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  padding-right: 16px;
  border-right: 1px solid var(--gray);
}

.archive__search {
  width: 100%;
  font-family: var(--serif);
  font-size: 13px;
  padding: 7px 10px;
  border: 1.5px solid var(--ink);
  background: #fbfaf7;
  color: var(--ink);
  margin-bottom: 14px;
}
.archive__search:focus { outline: 2px solid var(--red); outline-offset: -1px; }

.toc__group {
  margin: 16px 0 6px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--red);
}
.toc__group:first-child { margin-top: 0; }

.toc__list { list-style: none; margin: 0; padding: 0; }

.toc__item {
  display: block;
  width: 100%;
  text-align: left;
  font-family: var(--serif);
  background: transparent;
  border: 0;
  border-left: 3px solid transparent;
  padding: 7px 8px 8px 9px;
  cursor: pointer;
  color: var(--ink);
}
.toc__item:hover { background: #efece5; }
.toc__item.is-active {
  border-left-color: var(--red);
  background: #efece5;
}

.toc__item-title {
  display: block;
  font-size: 13.5px;
  line-height: 1.45;
}
.toc__item.is-active .toc__item-title { font-weight: 700; }

.toc__item-sub {
  /* -webkit-box + line-clamp：超过两行就截断加省略号 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 2px;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* 右栏阅读区 */
.archive__reader {
  border: 1.5px solid var(--ink);
  background: #fbfaf7;
  padding: 24px 28px 32px;
  box-shadow: 6px 6px 0 var(--ink);
  min-height: 320px;
}

.reader__cat {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--red);
}
.reader__title {
  margin: 0;
  font-size: 25px;
  line-height: 1.35;
  letter-spacing: -.01em;
}
.reader__meta {
  margin: 8px 0 0;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--ink);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- markdown 正文排版 ---------- */
.prose { font-size: 15px; line-height: 1.9; }
.prose > :first-child { margin-top: 20px; }

.prose h1 { font-size: 24px; line-height: 1.4; margin: 30px 0 12px; }
.prose h2 {
  font-size: 20px;
  line-height: 1.45;
  margin: 32px 0 12px;
  padding-top: 14px;
  border-top: 1px solid var(--gray);
}
.prose h3 { font-size: 16.5px; margin: 24px 0 8px; }
.prose h4, .prose h5, .prose h6 { font-size: 15px; margin: 18px 0 6px; }

.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 5px; }
.prose li > ul, .prose li > ol { margin: 5px 0 0; }

.prose a { color: var(--red); text-decoration: underline; text-underline-offset: 2px; }
.prose a.is-missing {
  color: var(--muted);
  text-decoration: line-through;
  cursor: not-allowed;
}

.prose code {
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 12.5px;
}
.prose :not(pre) > code {
  background: #e8e4db;
  padding: 1px 5px;
  white-space: nowrap;
}
.prose pre {
  background: #efece5;
  border-left: 3px solid var(--ink);
  padding: 12px 14px;
  margin: 0 0 16px;
  overflow-x: auto;
  line-height: 1.7;
}
.prose pre code { white-space: pre; }

.prose blockquote {
  margin: 0 0 16px;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--red);
  color: #4a4642;
}

.prose hr { border: 0; border-top: 1px solid var(--gray); margin: 26px 0; }

.prose img { max-width: 100%; }

.prose table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 13px;
  margin: 0 0 18px;
}
.prose th, .prose td {
  border: 1px solid var(--gray);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}
.prose th { background: #efece5; }

.prose input[type="checkbox"] { accent-color: var(--red); margin-right: 5px; }

/* ---------- 动画 ----------
   注意规则顺序：进场动画在最前，一次性动画在后。
   因为 .is-bumped / .is-pulse 用的是 animation 简写，
   写在后面才能把前面的 animation-delay 重新归零。 */

/* 进场：卡片轻微上浮淡入 */
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
.stage, .flash { animation: rise .5s ease backwards; }

/* 按顺序错开一点点，形成"依次浮出"的节奏 */
.stage:nth-child(2), .flash:nth-child(2) { animation-delay: .06s; }
.stage:nth-child(3), .flash:nth-child(3) { animation-delay: .12s; }
.stage:nth-child(4), .flash:nth-child(4) { animation-delay: .18s; }
.stage:nth-child(5), .flash:nth-child(5) { animation-delay: .24s; }
.flash:nth-child(6) { animation-delay: .30s; }
.flash:nth-child(7) { animation-delay: .36s; }

/* 勾选时：阶段卡片"弹"一下 */
@keyframes bump {
  0%   { transform: translate(0, 0);      box-shadow: 5px 5px 0 var(--ink); }
  35%  { transform: translate(-2px, -2px); box-shadow: 8px 8px 0 var(--red); }
  100% { transform: translate(0, 0);      box-shadow: 5px 5px 0 var(--ink); }
}
.stage.is-bumped { animation: bump .45s ease; }

/* 抽到某张卡：一圈红色冲击波 */
@keyframes pulse {
  0%   { transform: scale(1);     box-shadow: 0 0 0 0 rgba(179, 38, 30, .5); }
  30%  { transform: scale(1.015); }
  100% { transform: scale(1);     box-shadow: 0 0 0 18px rgba(179, 38, 30, 0); }
}
.flash.is-pulse { animation: pulse .8s ease; }

/* 某阶段全部勾完：整张卡片换红边红影 + ✓ */
.stage.is-complete { border-color: var(--red); box-shadow: 5px 5px 0 var(--red); }
.stage.is-complete .bar > span { background: var(--red); }
.stage.is-complete .stage__no::after { content: " ✓"; }

/* 尊重系统的"减少动态效果"设置：关掉所有动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- 页脚 ---------- */
.colophon {
  margin-top: 46px;
  padding-top: 14px;
  border-top: 3px solid var(--ink);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}
.colophon p { margin: 4px 0; }

/* ---------- 窄屏适配 ---------- */
@media (max-width: 720px) {
  .stages,
  .lab,
  .flashes { grid-template-columns: 1fr; }

  .block__head { flex-direction: column; }
  .block__note { max-width: none; }

  .readout { grid-template-columns: 1fr 1fr; }

  .stage { box-shadow: 4px 4px 0 var(--ink); }

  /* 窄屏时目录挪到上方，不再粘住 */
  .archive { grid-template-columns: 1fr; }
  .archive__toc {
    position: static;
    max-height: none;
    overflow: visible;
    padding-right: 0;
    padding-bottom: 14px;
    border-right: 0;
    border-bottom: 1px solid var(--gray);
  }
  .archive__reader { padding: 20px 18px 26px; box-shadow: 4px 4px 0 var(--ink); }
}