/* ============================================================
   老式打字机工具站 · 复古主题
   Antique Typewriter Toolbox — retro paper & ink theme
   ============================================================ */

:root {
  --paper: #f6f1e3;        /* 纸张米黄 */
  --paper-dark: #ece5d3;
  --paper-edge: #ddd3bb;
  --ink: #2a251f;          /* 墨色 */
  --ink-soft: #4d443a;
  --ink-faint: #7a6f60;
  --red: #a93c32;          /* 红色带 */
  --red-dark: #8a2f27;
  --brass: #8c6a3f;        /* 黄铜 */
  --brass-light: #b3926a;
  --line: #c9bda3;         /* 分隔线 */
  --line-strong: #4a4238;
  --shadow: rgba(42, 37, 31, 0.18);

  --font-en: "Special Elite", "Courier New", Courier, monospace;
  --font-cn: "Songti SC", "SimSun", "NSimSun", serif;
  --font-ui: var(--font-en), var(--font-cn);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(169, 60, 50, 0.05), transparent 45%),
    radial-gradient(circle at 80% 100%, rgba(140, 106, 63, 0.06), transparent 45%),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

/* ---------- 顶部红黑双线 ---------- */
.top-strip { height: 6px; background: linear-gradient(90deg, var(--red) 0 55%, var(--ink) 55% 100%); }

/* ---------- 页头 ---------- */
.site-header {
  border-bottom: 1px solid var(--line-strong);
  box-shadow: 0 2px 0 var(--paper-edge), 0 3px 0 rgba(42,37,31,0.08);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand-mark { width: 44px; height: 44px; flex: 0 0 44px; }
.brand-name { font-family: var(--font-en); font-size: 1.15rem; font-weight: 700; letter-spacing: 0.04em; line-height: 1.2; }
.brand-name small { display: block; font-size: 0.62rem; font-weight: 400; color: var(--red); letter-spacing: 0.28em; text-transform: uppercase; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-family: var(--font-en);
  font-size: 0.9rem;
  padding: 6px 12px;
  cursor: pointer;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.site-nav a {
  display: inline-block;
  padding: 6px 12px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.98rem;
  border: 1px solid transparent;
  border-radius: 2px;
}
.site-nav a:hover, .site-nav a:focus { color: var(--red); border-color: var(--line); background: #fffdf6; }
.site-nav .active > a { color: var(--red-dark); border-color: var(--line-strong); background: var(--paper-dark); font-weight: 700; }
.site-nav .nav-drop { position: relative; }
.site-nav .nav-drop summary {
  list-style: none; cursor: pointer;
  display: inline-block; padding: 6px 12px; margin: 0;
  color: var(--ink-soft); font-size: 0.98rem;
  border: 1px solid transparent; border-radius: 2px;
  user-select: none;
}
.site-nav .nav-drop summary::-webkit-details-marker { display: none; }
.site-nav .nav-drop summary::after { content: " ▾"; font-size: 0.7em; }
.site-nav .nav-drop.open summary { color: var(--red-dark); border-color: var(--line-strong); background: var(--paper-dark); font-weight: 700; }
.site-nav .nav-drop summary:hover, .site-nav .nav-drop[open] > summary { color: var(--red); border-color: var(--line); background: #fffdf6; }
.site-nav .nav-drop details[open] > summary { border-color: var(--line-strong); }
.site-nav .nav-drop details > ul {
  display: none;
  position: absolute; left: 0; top: 100%; z-index: 60;
  min-width: 220px;
  background: #fffdf6; border: 1px solid var(--line-strong);
  box-shadow: 3px 3px 0 var(--shadow);
  padding: 6px; margin: 4px 0 0;
}
.site-nav .nav-drop details[open] > ul { display: block; }
.site-nav .nav-drop details > ul > li { display: block; margin: 0; }
.site-nav .nav-drop details > ul a { display: block; width: 100%; border-color: transparent; }
.lang-switch a {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 2px;
}
.lang-switch a:hover { background: var(--red); }

/* ---------- 主布局 ---------- */
main { max-width: 1100px; margin: 0 auto; padding: 30px 20px 50px; }
.hero { text-align: center; padding: 26px 10px 18px; }
.hero .kicker {
  font-size: 0.82rem; letter-spacing: 0.34em; text-transform: uppercase; color: var(--red); font-weight: 700;
}
.hero h1 { font-family: var(--font-en); font-size: 2.5rem; margin: 10px 0 6px; letter-spacing: 0.02em; }
.hero p { max-width: 720px; margin: 0 auto; color: var(--ink-soft); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  font-size: 0.85rem; color: var(--ink-faint); margin: 6px 0 18px;
  font-family: var(--font-en);
}
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px; }
.breadcrumbs a { color: var(--ink-faint); text-decoration: none; }
.breadcrumbs a:hover { color: var(--red); text-decoration: underline; }
.breadcrumbs li + li::before { content: "›"; margin: 0 6px; color: var(--line-strong); }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 18px; }
.grid.cards-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.cards-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid.cards-4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.card {
  border: 1px solid var(--line-strong);
  background: #fffdf6;
  padding: 20px 20px 16px;
  position: relative;
  box-shadow: 3px 3px 0 rgba(42,37,31,0.08);
  display: block;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
a.card:hover, a.card:focus { transform: translate(-1px,-1px); box-shadow: 4px 4px 0 var(--red); color: var(--ink); }
.card .card-tag {
  font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--red); font-weight: 700; font-family: var(--font-en);
}
.card h3 { margin: 6px 0 8px; font-family: var(--font-en); font-size: 1.25rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; line-height: 1.65; }

/* ---------- 正文排版 ---------- */
.prose { max-width: 780px; margin: 0 auto; }
.prose h2 {
  font-family: var(--font-en);
  font-size: 1.6rem;
  margin: 2.2em 0 0.6em;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--ink);
  position: relative;
}
.prose h2::after { content: ""; position: absolute; left: 0; bottom: -5px; width: 100%; height: 2px; background: var(--red); }
.prose h3 { font-size: 1.15rem; margin: 1.8em 0 0.5em; color: var(--ink); }
.prose p { margin: 0.7em 0; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 0.4em 0; }
.prose a { color: var(--red-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose a:hover { background: var(--red); color: #fff; text-decoration: none; padding: 0 2px; }
.prose blockquote {
  margin: 1.2em 0; padding: 10px 18px;
  border-left: 4px solid var(--red);
  background: var(--paper-dark);
  color: var(--ink-soft);
  font-style: italic;
}
.prose code, .kbd {
  font-family: var(--font-en); font-size: 0.9em;
  background: var(--paper-dark); border: 1px solid var(--line);
  padding: 1px 6px; border-radius: 2px;
}
.prose table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: 0.95rem; }
.prose th, .prose td { border: 1px solid var(--line-strong); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--ink); color: var(--paper); font-family: var(--font-en); font-weight: 700; }
.prose tr:nth-child(even) td { background: #fbf7ec; }
.prose figure { margin: 1.6em 0; text-align: center; }
.prose figcaption { font-size: 0.82rem; color: var(--ink-faint); margin-top: 8px; font-family: var(--font-en); }
.prose .note { background: #fbf4e0; border: 1px dashed var(--brass); padding: 12px 16px; font-size: 0.92rem; }

/* 首字下沉用于品牌页 */
.dropcap::first-letter {
  font-family: var(--font-en); font-size: 3.2em; line-height: 0.8;
  float: left; margin: 0.08em 0.12em 0 0; color: var(--red); font-weight: 700;
}

/* ---------- 工具区 ---------- */
.tool-box {
  border: 2px solid var(--line-strong);
  background: #fffdf6;
  box-shadow: 4px 4px 0 var(--shadow);
  padding: 22px;
  margin: 26px 0;
}
.tool-box .tool-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.tool-box .tool-head h2 { margin: 0; font-size: 1.2rem; border: none; }
.tool-box .tool-head h2::after { display: none; }
.tool-label {
  font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--paper); background: var(--red); padding: 3px 8px; font-weight: 700; font-family: var(--font-en);
}
.btn {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.95rem;
  padding: 8px 16px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  border-radius: 2px;
  box-shadow: 2px 2px 0 var(--shadow);
  text-decoration: none;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--red); color: var(--paper); border-color: var(--red-dark); }
.btn.primary:hover { background: var(--red-dark); }
.btn.small { padding: 4px 10px; font-size: 0.8rem; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }

.field { margin: 12px 0; }
.field label { display: block; font-family: var(--font-en); font-size: 0.85rem; font-weight: 700; margin-bottom: 4px; letter-spacing: 0.05em; }
.field input[type="text"], .field input[type="number"], .field select, .field textarea {
  width: 100%; padding: 8px 10px; font-size: 1rem;
  font-family: var(--font-ui);
  border: 1px solid var(--line-strong); border-radius: 2px;
  background: #fffef9; color: var(--ink);
}
.field textarea { min-height: 90px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--brass-light); }

/* 打字机模拟器 */
.paper-sheet {
  background: #fdfaf0;
  border: 1px solid var(--line-strong);
  box-shadow: inset 0 0 0 1px var(--paper-edge), 4px 4px 0 rgba(42,37,31,0.12);
  padding: 26px 30px 30px;
  position: relative;
  font-family: var(--font-cn);
  line-height: 1.9;
}
.paper-sheet .sheet-top {
  position: absolute; top: 0; left: 0; right: 0; height: 14px;
  background: var(--paper-dark); border-bottom: 1px solid var(--line);
}
.paper-sheet textarea {
  width: 100%; min-height: 260px; background: transparent; border: none; resize: vertical;
  font-family: var(--font-cn); font-size: 1.1rem; line-height: 1.9; color: var(--ink);
  outline: none; padding: 0;
}
.typer-status { font-family: var(--font-en); font-size: 0.8rem; color: var(--ink-faint); margin-top: 6px; display: flex; gap: 18px; flex-wrap: wrap; }

/* 打字速度测试 */
.typing-test-wrap { font-family: var(--font-en); }
.test-passage {
  font-size: 1.05rem; line-height: 2; background: var(--paper-dark);
  border: 1px solid var(--line); padding: 14px 18px; min-height: 110px; letter-spacing: 0.02em;
}
.test-passage .char { color: var(--ink-faint); }
.test-passage .char.correct { color: var(--ink); }
.test-passage .char.wrong { color: var(--red); background: rgba(169,60,50,0.15); }
.test-passage .char.current { text-decoration: underline; text-decoration-color: var(--red); text-underline-offset: 4px; }
.test-input { width: 100%; min-height: 70px; font-family: var(--font-en); font-size: 1.05rem; padding: 10px; border: 1px solid var(--line-strong); background: #fffef9; }
.test-stats { display: flex; gap: 26px; flex-wrap: wrap; font-family: var(--font-en); margin-top: 10px; }
.test-stats .stat b { display: block; font-size: 1.7rem; line-height: 1.2; color: var(--red-dark); }
.test-stats .stat span { font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); }

/* 生成器预览 */
.gen-preview {
  font-family: var(--font-en); white-space: pre-wrap; word-break: break-word;
  background: #fdfaf0; border: 1px solid var(--line-strong); padding: 22px 26px; min-height: 120px;
  box-shadow: inset 0 0 0 1px var(--paper-edge); font-size: 1rem; line-height: 1.65;
}
.gen-preview.stamped { border: 3px double var(--line-strong); }
.gen-preview.red-ink { color: var(--red-dark); }

/* 音效控制台 */
.sound-pads { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.sound-pad {
  border: 1px solid var(--line-strong); background: var(--paper-dark); padding: 16px 10px;
  text-align: center; cursor: pointer; font-family: var(--font-en); border-radius: 3px;
  box-shadow: 2px 2px 0 var(--shadow);
}
.sound-pad:active { transform: translateY(2px); box-shadow: none; }
.sound-pad .icon { font-size: 1.8rem; display: block; }
.sound-pad .name { font-weight: 700; margin-top: 6px; display: block; }

/* 换算器 */
.conv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.conv-grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .conv-grid { grid-template-columns: 1fr; } }
.conv-result {
  font-family: var(--font-en); font-size: 1.15rem; padding: 10px 14px; margin-top: 8px;
  border: 1px dashed var(--brass); background: #fbf4e0; color: var(--ink);
}

/* 年代查询 */
.year-band { font-family: var(--font-en); display: inline-block; padding: 2px 8px; border: 1px solid var(--brass); background: #fbf4e0; border-radius: 2px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 2px solid var(--ink);
  background: var(--paper-dark);
  padding: 34px 20px 26px;
  margin-top: 40px;
}
.footer-inner { max-width: 1100px; margin: 0 auto; display: grid; gap: 26px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.footer-col h4 { font-family: var(--font-en); font-size: 0.85rem; letter-spacing: 0.18em; text-transform: uppercase; margin: 0 0 10px; color: var(--red-dark); }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin: 5px 0; }
.footer-col a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; }
.footer-col a:hover { color: var(--red); text-decoration: underline; }
.footer-bottom { max-width: 1100px; margin: 24px auto 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.8rem; color: var(--ink-faint); font-family: var(--font-en); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- 时间线 ---------- */
.timeline { margin: 24px 0 0; padding: 0; list-style: none; position: relative; }
.timeline::before { content: ""; position: absolute; left: 96px; top: 0; bottom: 0; width: 2px; background: var(--line-strong); }
@media (max-width: 640px) { .timeline::before { left: 66px; } }
.timeline li { display: grid; grid-template-columns: 96px 1fr; gap: 18px; margin: 0 0 16px; position: relative; }
@media (max-width: 640px) { .timeline li { grid-template-columns: 66px 1fr; } }
.timeline .year { font-family: var(--font-en); font-weight: 700; text-align: right; color: var(--red-dark); padding-top: 2px; }
.timeline .event { background: #fffdf6; border: 1px solid var(--line); padding: 12px 16px; }
.timeline .event h3 { margin: 0 0 4px; font-size: 1.05rem; font-family: var(--font-en); }
.timeline .event p { margin: 0; color: var(--ink-soft); font-size: 0.94rem; }

/* ---------- 术语表 ---------- */
.glossary dt { font-family: var(--font-en); font-weight: 700; margin-top: 18px; font-size: 1.05rem; }
.glossary dt .alt { color: var(--red); font-size: 0.8rem; }
.glossary dd { margin: 4px 0 0; color: var(--ink-soft); }

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--line); background: #fffdf6; margin: 10px 0; padding: 12px 16px;
}
.faq summary { cursor: pointer; font-family: var(--font-en); font-weight: 700; font-size: 1.02rem; }
.faq summary::marker { color: var(--red); }
.faq details[open] { border-color: var(--line-strong); }

/* ---------- 404 ---------- */
.err-404 { text-align: center; padding: 70px 20px; }
.err-404 .big { font-family: var(--font-en); font-size: 6rem; color: var(--red); line-height: 1; margin: 0; }
.err-404 .ribbon { font-family: var(--font-en); letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-faint); }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero h1 { font-size: 1.9rem; }
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; width: 100%; }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 2px; }
  .prose table { font-size: 0.85rem; }
}

/* 打字机光标闪烁 */
@keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
.caret-blink { animation: blink 1s step-end infinite; }

/* 按键时纸张轻微颤动 */
@keyframes type-shake {
  0% { transform: translate(0, 0); }
  25% { transform: translate(0.5px, -0.4px); }
  50% { transform: translate(-0.4px, 0.3px); }
  75% { transform: translate(0.3px, 0.2px); }
  100% { transform: translate(0, 0); }
}
.paper-sheet.shake { animation: type-shake 0.16s linear; }

/* 打印优化 */
@media print {
  .site-header, .site-footer, .tool-box .btn, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .paper-sheet { box-shadow: none; border: 1px solid #000; }
}