/* 外企生存手册 —— 编辑式阅读体验
   设计来源：批改过的英语作业本（红笔改错、荧光标注、墨水蓝）+ 商务文书排版
   ---------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

:root {
  --paper:    #FBFAF7;
  --paper-2:  #F4F1EA;
  --paper-3:  #EDE8DE;
  --ink:      #1B3A57;
  --ink-soft: #3D5A73;
  --red:      #B33A2B;
  --green:    #4A6558;
  --gold:     #B8860B;
  --mute:     #6E6A64;
  --rule:     #DCD6C9;
  --rule-soft:#E8E3D8;

  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "STSong", Georgia, "Times New Roman", serif;
  --sans:  "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono:  "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --measure: 66ch;
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--red); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 页头 ---------- */
.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.6rem 1.5rem 1.1rem;
  border-bottom: 1px solid var(--rule);
}

.brand { display: flex; align-items: baseline; gap: .5rem; }
.brand-mark {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: .08em;
}
.brand-sub {
  font-size: .8rem;
  letter-spacing: .3em;
  color: var(--mute);
}

.mast-nav { display: flex; gap: 1.4rem; font-size: .9rem; }
.mast-nav a { color: var(--ink-soft); }
.mast-nav a:hover { color: var(--red); }

/* ---------- 布局 ---------- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 1.5rem 4rem; }
.wrap-narrow { max-width: 780px; margin: 0 auto; padding: 0 1.5rem 4rem; }

/* ---------- 首页 hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 3.5rem;
  align-items: center;
  padding: 3.6rem 0 3rem;
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4.2vw, 3.15rem);
  line-height: 1.28;
  font-weight: 700;
  margin: 0 0 1.1rem;
  letter-spacing: -.01em;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 34ch;
  margin: 0 0 1.8rem;
}

.hero-stats {
  display: flex;
  gap: 2.2rem;
  font-size: .875rem;
  color: var(--mute);
}
.hero-stats b {
  display: block;
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.2;
}

/* 批改示范：一屏之内讲清这个站做什么 */
.markup {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 1.5rem 1.4rem;
  font-size: .95rem;
}
.markup-label {
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--mute);
  margin: 0 0 1rem;
}
.bubble {
  background: #fff;
  border: 1px solid var(--rule);
  padding: .8rem 1rem;
  margin: 0 0 .55rem;
  line-height: 1.6;
}
.bubble-who {
  display: block;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--mute);
  margin-bottom: .3rem;
}
.bubble-en { font-family: var(--serif); }

.strike {
  text-decoration: line-through;
  text-decoration-color: var(--red);
  text-decoration-thickness: 1.5px;
  color: var(--ink-soft);
}

.markup-fix {
  margin-top: .9rem;
  padding-top: .9rem;
  border-top: 1px dashed var(--rule);
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--green);
}
.markup-fix em {
  font-style: normal;
  display: block;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--mute);
  margin-top: .35rem;
  line-height: 1.6;
}

/* ---------- 今日一句 ---------- */
.today {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: .95rem;
}
.today-tag {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold);
  flex: none;
}
.today a { font-family: var(--serif); font-size: 1.05rem; border-bottom: 1px solid var(--rule); }
.today a:hover { border-color: var(--red); }

/* ---------- 模块列表 ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 3rem 0 1.4rem;
}
.section-head h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
}
.section-head span { font-size: .82rem; color: var(--mute); }

.mod-list { border-top: 1px solid var(--rule); }

.mod-row {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: baseline;
  padding: 1.25rem .4rem 1.25rem 1rem;
  border-bottom: 1px solid var(--rule-soft);
  border-left: 3px solid transparent;
  transition: border-color .15s, background .15s;
}
.mod-row:hover { background: var(--paper-2); border-left-color: var(--acc, var(--ink)); }

.mod-icon { font-size: 1.3rem; line-height: 1; }
.mod-name { font-family: var(--serif); font-size: 1.15rem; font-weight: 700; }
.mod-en {
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--mute);
  margin-left: .6rem;
  font-family: var(--sans);
  font-weight: 400;
}
.mod-intro { font-size: .9rem; color: var(--ink-soft); margin: .3rem 0 0; max-width: 52ch; }
.mod-count { font-size: .8rem; color: var(--mute); white-space: nowrap; }

/* ---------- 课程列表（模块页） ---------- */
.lesson-list { border-top: 1px solid var(--rule); margin-top: .5rem; }

.lesson-row {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: 1.2rem .4rem 1.2rem .2rem;
  border-bottom: 1px solid var(--rule-soft);
}
.lesson-row:hover { background: var(--paper-2); }

.lesson-no {
  font-family: var(--mono);
  font-size: .82rem;
  color: var(--mute);
  padding-top: .15rem;
}
.lesson-title { font-family: var(--serif); font-size: 1.1rem; font-weight: 700; line-height: 1.5; }
.lesson-meta { font-size: .8rem; color: var(--mute); margin-top: .25rem; }

.badge {
  display: inline-block;
  font-size: .72rem;
  letter-spacing: .06em;
  padding: .12rem .5rem;
  border: 1px solid var(--rule);
  color: var(--mute);
  white-space: nowrap;
}
.badge-ok { border-color: var(--green); color: var(--green); }

/* ---------- 课程正文 ---------- */
.lesson-head {
  padding: 2.6rem 0 1.8rem;
  border-bottom: 1px solid var(--rule);
}
.crumb {
  font-size: .8rem;
  color: var(--mute);
  letter-spacing: .06em;
  margin-bottom: 1rem;
}
.crumb a { border-bottom: 1px solid var(--rule); }
.crumb a:hover { border-color: var(--red); }

.lesson-head h1 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  line-height: 1.4;
  font-weight: 700;
  margin: 0 0 .8rem;
  max-width: 30ch;
}
.lesson-kicker { font-size: .85rem; color: var(--mute); }

.hook {
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.95;
  color: var(--ink);
  margin: 2.2rem 0 2.6rem;
  max-width: var(--measure);
  padding-left: 1.3rem;
  border-left: 2px solid var(--paper-3);
}

.sec { margin: 0 0 2.8rem; max-width: var(--measure); }
.sec-title {
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--mute);
  font-weight: 600;
  margin: 0 0 1rem;
}

/* 对话 */
.dialogue { display: flex; flex-direction: column; gap: .9rem; }
.turn { display: grid; grid-template-columns: 5.2rem minmax(0, 1fr); gap: 1rem; }
.turn-who {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--mute);
  padding-top: .2rem;
  text-align: right;
}
.turn-body { border-left: 1px solid var(--rule); padding-left: 1rem; }
.turn-en { font-family: var(--serif); font-size: 1.04rem; line-height: 1.7; }
.turn-zh { font-size: .88rem; color: var(--mute); margin-top: .2rem; line-height: 1.65; }

/* 中式表达纠错 —— 红笔批改，本站唯一的高强调区域 */
.fix { border-top: 1px solid var(--rule); }
.fix-item { padding: 1.4rem 0; border-bottom: 1px solid var(--rule-soft); }
.fix-wrong {
  font-family: var(--serif);
  font-size: 1.05rem;
  text-decoration: line-through;
  text-decoration-color: var(--red);
  text-decoration-thickness: 1.5px;
  color: var(--ink-soft);
  margin: 0 0 .55rem;
}
.fix-why { font-size: .9rem; color: var(--ink-soft); margin: 0 0 .8rem; line-height: 1.75; }
.fix-right {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--green);
  padding-left: .9rem;
  border-left: 2px solid var(--green);
}

/* 文化潜台词：边注感 */
.culture {
  background: var(--paper-2);
  padding: 1.4rem 1.5rem;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--ink-soft);
  border-left: 3px solid var(--gold);
  max-width: var(--measure);
}

/* 句型表 */
.patterns { border-top: 1px solid var(--rule); }
.pattern {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.2rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.pattern-en { font-family: var(--serif); font-size: 1rem; line-height: 1.65; }
.pattern-zh { font-size: .85rem; color: var(--mute); }
.pattern-use { font-size: .8rem; color: var(--ink-soft); margin-top: .2rem; }

/* 黑话 */
.jargon-list { display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; }
.jargon-item { font-size: .9rem; }
.jargon-term { font-family: var(--mono); font-size: .88rem; color: var(--ink); }
.jargon-zh { color: var(--mute); margin-left: .45rem; }

/* 跟读句 */
.read-list { counter-reset: r; list-style: none; padding: 0; margin: 0; }
.read-list li {
  counter-increment: r;
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  gap: .8rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.7;
}
.read-list li::before {
  content: counter(r);
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--mute);
  padding-top: .25rem;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: .92rem;
  padding: .7rem 1.5rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.btn:hover { background: var(--ink-soft); border-color: var(--ink-soft); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-sm { padding: .4rem .9rem; font-size: .82rem; }

.cta-row {
  display: flex;
  gap: .8rem;
  flex-wrap: wrap;
  padding: 2rem 0 0;
  border-top: 1px solid var(--rule);
  margin-top: 2.5rem;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-size: .9rem;
}
.pager a { color: var(--ink-soft); }
.pager a:hover { color: var(--red); }

/* ---------- 练习页 ---------- */
.quiz-item {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule);
}
.quiz-q {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 1rem;
}
.quiz-opts { display: flex; flex-direction: column; gap: .5rem; }
.opt {
  display: flex;
  gap: .7rem;
  align-items: flex-start;
  padding: .6rem .8rem;
  border: 1px solid var(--rule);
  cursor: pointer;
  font-size: .95rem;
  line-height: 1.6;
  background: transparent;
  text-align: left;
  font-family: var(--sans);
  color: var(--ink);
  transition: border-color .12s, background .12s;
}
.opt:hover { border-color: var(--ink-soft); background: var(--paper-2); }
.opt input { margin-top: .35rem; flex: none; }
.opt.sel { border-color: var(--ink); background: var(--paper-2); }
.opt.correct { border-color: var(--green); background: rgba(74,101,88,.07); }
.opt.wrong { border-color: var(--red); background: rgba(179,58,43,.06); }

.fill-input {
  width: 100%;
  font-family: var(--serif);
  font-size: 1rem;
  padding: .65rem .8rem;
  border: 1px solid var(--rule);
  background: #fff;
  color: var(--ink);
}
.fill-input:focus { border-color: var(--ink); outline: none; }

.quiz-explain {
  margin-top: .9rem;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--ink-soft);
  padding-left: .9rem;
  border-left: 2px solid var(--rule);
}
.quiz-explain.ok { border-color: var(--green); }
.quiz-explain.no { border-color: var(--red); }

.score-box {
  display: none;
  margin: 2rem 0 0;
  padding: 1.6rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  text-align: center;
}
.score-box.show { display: block; }
.score-num {
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
}
.score-note { font-size: .9rem; color: var(--mute); margin-top: .6rem; }

/* 跟读 */
.read-item { padding: 1.2rem 0; border-bottom: 1px solid var(--rule-soft); }
.read-sentence { font-family: var(--serif); font-size: 1.05rem; line-height: 1.7; margin: 0 0 .8rem; }
.read-actions { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }
.read-result { font-size: .85rem; color: var(--mute); }
.read-result b { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); }
.read-result.good b { color: var(--green); }
.read-result.bad b { color: var(--red); }
.rec { animation: pulse 1.1s infinite; }
@keyframes pulse { 50% { opacity: .45; } }
@media (prefers-reduced-motion: reduce) { .rec { animation: none; } }

/* ---------- 进度页 ---------- */
.prog-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin: 2rem 0 3rem;
}
.prog-cell { background: var(--paper); padding: 1.4rem 1.2rem; }
.prog-cell b {
  display: block;
  font-family: var(--serif);
  font-size: 1.9rem;
  line-height: 1.1;
}
.prog-cell span { font-size: .82rem; color: var(--mute); }

.prog-mod { margin-bottom: 1.6rem; }
.prog-mod-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: .9rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--rule);
}
.bar { height: 4px; background: var(--paper-3); margin-top: .5rem; }
.bar > i { display: block; height: 100%; background: var(--ink); }

/* ---------- 空状态 / 404 ---------- */
.empty { padding: 3rem 0; color: var(--mute); font-size: .95rem; }

/* ---------- 页脚 ---------- */
.foot {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  border-top: 1px solid var(--rule);
  font-size: .82rem;
  color: var(--mute);
}
.foot p { margin: 0 0 .3rem; }
.foot-dim { color: var(--mute); opacity: .72; }

/* ---------- 响应式 ---------- */
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; gap: 2.2rem; padding-top: 2.4rem; }
  .hero-lead { max-width: none; }
  .pattern { grid-template-columns: 1fr; gap: .3rem; }
  .mod-row { grid-template-columns: 2.2rem minmax(0, 1fr); }
  .mod-count { grid-column: 2; }
  .turn { grid-template-columns: 1fr; gap: .2rem; }
  .turn-who { text-align: left; }
  .turn-body { border-left: none; padding-left: 0; }
  .prog-summary { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  body { font-size: 1rem; }
  .wrap, .wrap-narrow, .masthead, .foot { padding-left: 1.1rem; padding-right: 1.1rem; }
  .lesson-row { grid-template-columns: 1.8rem minmax(0, 1fr); }
  .lesson-row .badge { grid-column: 2; justify-self: start; margin-top: .3rem; }
}