/* ============================================================
   高级口译通关营 · 样式系统
   设计语言：顶尖高校官网的「编辑学院风」——
   衬线展示标题 + 无衬线正文、牛津深蓝 × 羊皮纸底、细双线规则、
   金色小节号（§）、庄重的深蓝页脚。纯系统字体，不引外部资源。
   JS 依赖的类名（.pf-unit/.cd-cell/.stat/.line/.answer 等）全部保留。
   ============================================================ */

:root {
  /* 纸面与墨色 */
  --bg: #f6f3ea;            /* 羊皮纸 */
  --card: #fffdf7;
  --ink: #1d2531;
  --muted: #6d6a5c;
  --line: #ddd6c5;

  /* 学院色 */
  --primary: #0d2b52;       /* 牛津深蓝 */
  --primary-deep: #081d3a;
  --accent: var(--primary);           /* 兼容页内联样式 var(--accent) */
  --accent-strong: var(--primary-deep);
  --accent-soft: #e9ecdf;
  --gold: #96762a;          /* 黄铜 */
  --ok: #2e6b4f;
  --warn: #8f6414;
  --hard: #8c2f2f;          /* 绯红 */

  /* 页脚（庄重深蓝） */
  --footer-bg: #081d3a;
  --footer-ink: #e8e4d6;
  --footer-muted: #9faec4;
  --footer-link: #cfae62;

  --serif: "Palatino", "Palatino Linotype", "Book Antiqua", Georgia,
           "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;

  --radius: 6px;
  --shadow: 0 1px 0 rgba(29, 37, 49, .04);
  --rule: 3px double var(--line);   /* 学院双细线 */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1420;
    --card: #171e2d;
    --ink: #e7e3d4;
    --muted: #99968a;
    --line: #2b3548;

    --primary: #a9c3e8;
    --primary-deep: #cddcf1;
    --accent: var(--primary);
    --accent-strong: var(--primary-deep);
    --accent-soft: #1c2740;
    --gold: #c9a96a;
    --ok: #85bd9e;
    --warn: #d0a659;
    --hard: #d98077;

    --footer-bg: #0a0f19;
    --footer-ink: #d5d1c2;
    --footer-muted: #7d8798;
    --footer-link: #c9a96a;

    --shadow: 0 1px 0 rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: color-mix(in srgb, var(--gold) 32%, transparent); }

a { color: var(--primary); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--primary-deep); text-decoration: underline; text-underline-offset: 3px; }

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

code, pre {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
  background: color-mix(in srgb, var(--muted) 12%, transparent);
  border-radius: 4px;
}
code { padding: 2px 6px; }
pre { padding: 14px 16px; overflow-x: auto; line-height: 1.6; }
pre code { background: none; padding: 0; }

/* ---------- 顶栏：纸面 + 学院双线 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--card) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: var(--rule);
}

.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: space-between;
}

.brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .01em;
  color: var(--ink);
  white-space: nowrap;
}
.brand span { color: var(--gold); }

.topbar nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }

.topbar nav a {
  padding: 3px 0;
  color: var(--muted);
  font-size: 13.5px;
  letter-spacing: .12em;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.topbar nav a:hover { color: var(--ink); text-decoration: none; }
.topbar nav a.active {
  color: var(--primary);
  border-bottom-color: var(--gold);
  font-weight: 600;
}

/* ---------- 版式 ---------- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 40px 24px 72px; }

.hero {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: var(--rule);
  border-radius: var(--radius);
  padding: 48px 44px 42px;
  margin-bottom: 44px;
  box-shadow: var(--shadow);
}
.hero h1 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(28px, 4.2vw, 42px);
  line-height: 1.28;
  letter-spacing: .01em;
  max-width: 24em;
}
.hero p.lead {
  margin: 0 0 10px;
  font-size: 16.5px;
  color: var(--muted);
  max-width: 44em;
}
.hero .cta { margin-top: 24px; display: flex; gap: 14px; flex-wrap: wrap; }

/* 章节标题：金色小节号 + 顶部细线（学术刊物式） */
h2 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .01em;
  margin: 56px 0 10px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}
h2::before { content: "§ "; color: var(--gold); font-weight: 400; }
h2 + p.sub { color: var(--muted); margin-top: 0; }
h3 {
  font-size: 17px;
  margin: 26px 0 8px;
  letter-spacing: .02em;
}

p.sub { color: var(--muted); }
.small { font-size: 13px; color: var(--muted); }
.toc {
  color: var(--muted);
  font-size: 13.5px;
  letter-spacing: .04em;
  margin-top: -18px;
}
.toc a { margin-right: 10px; }

/* ---------- 按钮：方正、字距、学院色 ---------- */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 3px;
  background: var(--primary);
  color: #f6f3ea;
  font-weight: 600;
  font-size: 14.5px;
  letter-spacing: .06em;
  border: 1.5px solid var(--primary);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.btn:hover { background: var(--primary-deep); border-color: var(--primary-deep); color: #f6f3ea; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--primary); }
.btn.ghost:hover { background: color-mix(in srgb, var(--primary) 8%, transparent); color: var(--primary); }
@media (prefers-color-scheme: dark) {
  .btn { color: #0e1420; }
  .btn:hover { color: #0e1420; }
  .btn.ghost { color: var(--primary); }
  .btn.ghost:hover { color: var(--primary); }
}

/* ---------- 卡片：平铺 + 细线，去掉重阴影 ---------- */
.grid { display: grid; gap: 18px; margin: 18px 0; }
.grid.c2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid.c3 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow);
  transition: border-color .15s ease;
}
.card:hover { border-color: color-mix(in srgb, var(--primary) 45%, var(--line)); }
.card h3 { margin-top: 0; }
.card .meta { color: var(--muted); font-size: 14px; }
.card .tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.card ul { padding-left: 20px; }
.card li { margin-bottom: 6px; }

/* 徽章：纸感底色 */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 3px;
  border: 1px solid transparent;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .05em;
  line-height: 1.7;
  white-space: nowrap;
  vertical-align: middle;
}
.badge.ez   { background: #e2eee2; color: #2e6b4f; border-color: #c6dcc6; }
.badge.mid  { background: #f3e9d2; color: #7c5c12; border-color: #e3d3ab; }
.badge.hard { background: #f5e2dc; color: #8c2f2f; border-color: #e5c4ba; }
.badge.tool { background: #e7ecf3; color: var(--primary); border-color: #c9d5e4; }
@media (prefers-color-scheme: dark) {
  .badge.ez   { background: #1d2b24; color: #85bd9e; border-color: #2c4136; }
  .badge.mid  { background: #2c2513; color: #d0a659; border-color: #4a3d1e; }
  .badge.hard { background: #331d1b; color: #d98077; border-color: #522f2b; }
  .badge.tool { background: #1c2740; color: #a9c3e8; border-color: #2e3d5c; }
}

/* 提示框：左侧 3px 规则线 */
.callout {
  border-left: 3px solid var(--primary);
  background: color-mix(in srgb, var(--card) 70%, var(--bg));
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 15px;
}
.callout.warn { border-color: var(--warn); }
.callout.ok { border-color: var(--ok); }

/* ---------- 表格：刊物式细线 ---------- */
.table-wrap { overflow-x: auto; margin: 18px 0; }
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14.5px;
}
th, td { padding: 12px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--primary);
  background: color-mix(in srgb, var(--accent-soft) 55%, transparent);
  border-bottom: 2px solid color-mix(in srgb, var(--primary) 45%, var(--line));
}
tr:last-child td { border-bottom: none; }

/* ---------- 步骤：衬线序号牌 ---------- */
.steps { counter-reset: step; margin: 20px 0; padding: 0; list-style: none; }
.steps li {
  position: relative;
  padding: 14px 18px 14px 60px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px; top: 16px;
  width: 30px; height: 30px;
  border: 1.5px solid var(--primary);
  border-radius: 4px;
  color: var(--primary);
  font-family: var(--serif);
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
}
.steps b { display: block; }

/* ---------- 打卡面板 ---------- */
.checkin {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: var(--rule);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin: 22px 0;
}
.checkin .date { font-family: var(--serif); font-weight: 700; font-size: 17px; }
.checkin .streak { float: right; color: var(--gold); font-weight: 700; font-size: 15px; }
.checkin label {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 4px; cursor: pointer; font-size: 15px;
}
.checkin label:hover { background: color-mix(in srgb, var(--accent-soft) 55%, transparent); }
.checkin input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--primary); }
.checkin .hint { color: var(--muted); font-size: 13px; margin-top: 10px; }

/* 今日推荐 */
.daily { display: flex; gap: 16px; align-items: flex-start; }
.daily .emoji { font-size: 32px; line-height: 1.2; }

/* ---------- 训练台 ---------- */
.bench { display: grid; gap: 20px; grid-template-columns: 1fr; }
@media (min-width: 900px) { .bench { grid-template-columns: 5fr 4fr; align-items: start; } }

.bench audio { width: 100%; margin: 10px 0; }
.bench-controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.bench button {
  padding: 8px 14px; border-radius: 3px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font-size: 13.5px; cursor: pointer;
  font-weight: 500; letter-spacing: .03em;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.bench button:hover { border-color: var(--primary); color: var(--primary); }
.bench button.primary { background: var(--primary); border-color: var(--primary); color: #f6f3ea; }
.bench button.primary:hover { background: var(--primary-deep); }
@media (prefers-color-scheme: dark) {
  .bench button.primary { color: #0e1420; }
}
.bench button:disabled { opacity: .45; cursor: not-allowed; }
.bench .marks { color: var(--muted); font-size: 13px; }
.bench select {
  padding: 7px 10px; border-radius: 3px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font-size: 14px;
}
.bench textarea, .bench input[type=text] {
  width: 100%; border: 1px solid var(--line); border-radius: 4px;
  padding: 10px 12px; font-size: 15px; background: var(--card); color: var(--ink);
  font-family: inherit;
}
.bench textarea { min-height: 130px; resize: vertical; line-height: 1.7; }
.bench textarea:focus, .bench input[type=text]:focus { border-color: var(--primary); outline: none; }
.answer-box { min-height: 58px; }
.answer-box .answer {
  background: #e5efe2; border: 1px solid #b7cfb2; color: #24422f;
  border-radius: 4px; padding: 10px 14px; font-size: 16px;
}
.answer-box .empty { color: var(--muted); font-size: 14px; padding: 10px 2px; }
@media (prefers-color-scheme: dark) {
  .answer-box .answer { background: #1b2a21; border-color: #2e4636; color: #a9d0b6; }
}
.stat-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.stat {
  flex: 1; min-width: 90px; text-align: center;
  background: color-mix(in srgb, var(--accent-soft) 60%, transparent);
  border: 1px solid var(--line);
  border-radius: 4px; padding: 12px 6px 10px;
}
.stat b { display: block; font-family: var(--serif); font-size: 22px; color: var(--primary); }
.stat span { font-size: 12.5px; color: var(--muted); }
.kbd {
  font-size: 12px; border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 3px; padding: 1px 6px; background: var(--card);
}
.line { padding: 3px 6px; border-radius: 3px; }
.line:hover { background: color-mix(in srgb, var(--accent-soft) 55%, transparent); }
.line.current { background: color-mix(in srgb, var(--accent-soft) 75%, transparent); }

/* 最新素材 */
.feed-box { margin-top: 10px; }
.feed-box ul { margin: 6px 0 0; padding-left: 20px; }
.feed-box li { margin-bottom: 4px; }
.feed-date { color: var(--muted); font-size: 12.5px; margin-left: 6px; }

/* ---------- 倒计时：衬线大数字 ---------- */
.countdown {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin: 20px 0;
}
.countdown .cd-cell {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  border-radius: var(--radius);
  padding: 18px 12px 14px;
  text-align: center;
  box-shadow: var(--shadow);
}
.countdown .cd-cell.hot { border-top-color: var(--hard); }
.countdown b {
  display: block;
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.15;
  color: var(--primary);
  font-variant-numeric: lining-nums;
}
.countdown .cd-cell.hot b { color: var(--hard); }
.countdown span { font-size: 13px; color: var(--ink); font-weight: 600; letter-spacing: .02em; }
.countdown small { display: block; margin-top: 4px; font-size: 11.5px; color: var(--muted); line-height: 1.5; }

/* ---------- 口试判分器 ---------- */
.pass-fail { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.pf-unit {
  flex: 1; min-width: 72px; text-align: center;
  padding: 12px 4px;
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: 4px;
  font-weight: 700; color: var(--muted);
  cursor: pointer; user-select: none;
  font-size: 15px; letter-spacing: .04em;
  transition: background .12s ease, color .12s ease, border-color .12s ease;
}
.pf-unit:hover { border-color: var(--primary); color: var(--primary); }
.pf-unit.pass { background: #e2eee2; color: #2e6b4f; border-color: #2e6b4f; }
.pf-unit.fail { background: #f5e2dc; color: #8c2f2f; border-color: #8c2f2f; text-decoration: line-through; }
@media (prefers-color-scheme: dark) {
  .pf-unit.pass { background: #1d2b24; color: #85bd9e; border-color: #3a5c49; }
  .pf-unit.fail { background: #331d1b; color: #d98077; border-color: #6b3a34; }
}
.pf-verdict { margin-top: 12px; font-weight: 700; font-size: 15px; }
.pf-verdict.good { color: var(--ok); }
.pf-verdict.bad { color: var(--hard); }

/* ---------- 页脚：深蓝学院卷尾 ---------- */
footer {
  background: var(--footer-bg);
  color: var(--footer-ink);
  font-size: 13.5px;
  padding: 36px 24px 48px;
  text-align: center;
  border-top: 3px double var(--gold);
}
footer p { max-width: 860px; margin: 8px auto; line-height: 1.9; }
footer a { color: var(--footer-link); }
footer a:hover { color: var(--gold); text-decoration: underline; }

hr.sep { border: none; border-top: 1px solid var(--line); margin: 40px 0; }

/* 窄屏 */
@media (max-width: 640px) {
  .wrap { padding: 28px 18px 56px; }
  .hero { padding: 32px 24px 30px; }
  .topbar-inner { padding: 12px 16px; gap: 8px; }
  .topbar nav { gap: 2px 14px; }
  .topbar nav a { letter-spacing: .06em; }
}

/* 眉题：hero 内的英文小字距大写（学院风） */
.kicker {
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 16px;
}

/* 本机音频库 */
.lib-row {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line); border-radius: 4px;
  margin-bottom: 8px; font-size: 14px;
  background: color-mix(in srgb, var(--card) 70%, var(--bg));
}
.lib-row .lib-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.lib-row .lib-meta { color: var(--muted); font-size: 12px; white-space: nowrap; }
.lib-row button {
  padding: 4px 10px; border-radius: 3px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; font-size: 12.5px;
}
.lib-row button:hover { border-color: var(--primary); color: var(--primary); }
.lib-row button.danger:hover { border-color: var(--hard); color: var(--hard); }