/* ============================================================
   纸飞机 telegramwep.com.cn ——「电报局」设计语言(Vintage Telegraph)
   与前站 telegram-aa(航空航线/深海军蓝)、telegram-bb(折纸书信/暖米白)彻底不同:
   深墨绿 + 黄铜金 + 磷光信号绿,等宽电码字体,
   招牌区块 = 摩斯电码跑马灯 + 发报终端 + 信号波形,隐喻「发报/收报/通电全球」。
   ============================================================ */

:root {
  --paper: #0c1a13;
  --paper-2: #0f2118;
  --panel: #132a1f;
  --ink: #f0ead6;
  --ink-2: #c6c0aa;
  --muted: #8fa495;
  --accent: #3ec08a;
  --accent-2: #5bd3a3;
  --gold: #d8a93f;
  --gold-2: #e9c26a;
  --line: #243d30;
  --line-2: #375442;
  --deep: #07110c;
  --deep-2: #0a1710;
  --shadow: 0 14px 34px rgba(0, 0, 0, .38);
  --shadow-sm: 0 5px 16px rgba(0, 0, 0, .30);
  --blue: #3ec08a;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, "Courier New", monospace;
}

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

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

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
em { font-style: normal; color: var(--accent); }
em.en { font-style: italic; letter-spacing: .5px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-family: var(--sans); border-radius: 11px;
  padding: 13px 26px; font-size: 16px; line-height: 1; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; transition: .2s ease;
}
.btn-primary { background: var(--accent); color: #07110c; box-shadow: 0 6px 18px rgba(62, 192, 138, .22); }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(62, 192, 138, .30); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #07110c; }
.btn-lg { padding: 16px 34px; font-size: 17px; border-radius: 13px; }
.btn-sm { padding: 9px 18px; font-size: 14px; border-radius: 9px; }

/* ---------- 摩斯电码跑马灯 ---------- */
.ticker { background: var(--deep); border-bottom: 1px solid var(--line); overflow: hidden; padding: 9px 0; }
.ticker-track { display: inline-flex; white-space: nowrap; animation: tick 38s linear infinite; font-family: var(--mono); font-size: 13px; letter-spacing: 2px; color: var(--gold); }
.ticker-track .tick-item { display: inline-flex; align-items: center; gap: 10px; margin-right: 42px; }
.ticker-track .m { color: var(--accent); letter-spacing: 3px; }
@keyframes tick { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* ---------- 顶部信息条 ---------- */
.topbar { background: var(--deep); color: #d8cba4; font-size: 13px; border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 9px; padding-bottom: 9px; }
.tb-msg { letter-spacing: .4px; }
.tb-link { color: var(--gold); font-weight: 700; white-space: nowrap; }
.tb-link:hover { color: var(--gold-2); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(12, 26, 19, .94); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 22px; height: 68px; }
.brand { display: flex; align-items: center; gap: 11px; }
.brand-ico { width: 38px; height: 38px; border-radius: 9px; }
.brand-name { display: block; font-weight: 800; font-size: 18px; letter-spacing: .5px; line-height: 1.1; color: var(--ink); }
.brand-sub { display: block; font-size: 11px; color: var(--muted); letter-spacing: .5px; font-family: var(--mono); }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links > a,
.dd > button {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 15px; font-weight: 600; color: var(--ink-2);
  padding: 8px 12px; border-radius: 9px; background: transparent; border: none; cursor: pointer;
}
.nav-links > a:hover,
.dd > button:hover { color: var(--accent); background: var(--paper-2); }
.nav-links .on,
.dd > button.on { color: var(--accent); }
.dd { position: relative; }
.dd-menu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 190px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); padding: 8px; opacity: 0; visibility: hidden;
  transform: translateY(8px); transition: .18s ease; z-index: 60;
}
.dd:hover .dd-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dd-menu a { display: block; padding: 9px 12px; border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.dd-menu a:hover { background: var(--paper-2); color: var(--accent); }
.nav-cta { margin-left: 4px; }
.nav-toggle { display: none; font-size: 26px; background: transparent; border: none; color: var(--ink); cursor: pointer; }

/* ---------- Hero:电报局(居中 + 发报终端) ---------- */
.mast { position: relative; overflow: hidden; padding: 84px 0 64px; }
.mast-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center;
  filter: blur(30px) brightness(.5);
}
.mast-bg::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(62, 192, 138, .13) 1px, transparent 1.5px);
  background-size: 22px 22px;
}
.mast-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(12, 26, 19, .80) 0%, rgba(12, 26, 19, .92) 100%);
}
.mast-center { position: relative; z-index: 1; text-align: center; }
.mast-kicker {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--accent);
  text-transform: uppercase; padding: 7px 16px; border: 1px dashed var(--accent);
  border-radius: 999px; background: rgba(7, 17, 12, .6); font-family: var(--mono);
}
.mast-kicker .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: blink 1.6s ease-in-out infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .25; } }
.mast-h1 { font-size: clamp(34px, 5.2vw, 60px); font-weight: 800; line-height: 1.14; letter-spacing: -1px; margin: 24px 0 20px; }
.mast-lede { font-size: 18px; color: var(--ink-2); max-width: 680px; margin: 0 auto; }
.mast-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 30px; }
.mast-proof { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 28px; }
.proof-item { font-size: 13px; font-weight: 600; color: var(--ink-2); background: rgba(19, 42, 31, .75); border: 1px solid var(--line-2); padding: 6px 13px; border-radius: 999px; }
.proof-item::before { content: "·"; color: var(--accent); margin-right: 6px; font-family: var(--mono); }
.mast-note { margin-top: 20px; font-size: 13px; color: var(--muted); font-family: var(--mono); }

/* 发报终端(招牌) */
.terminal { max-width: 780px; margin: 46px auto 0; text-align: left; background: var(--deep); border: 1px solid var(--line-2); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); }
.terminal-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: var(--deep-2); border-bottom: 1px solid var(--line); }
.terminal-dot { width: 12px; height: 12px; border-radius: 50%; }
.terminal-dot.r { background: #e05a4e; }
.terminal-dot.g { background: var(--gold); }
.terminal-dot.b { background: var(--accent); }
.terminal-title { margin-left: 12px; font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 1.5px; }
.terminal-body { padding: 22px 24px 24px; display: grid; gap: 16px; }
.term-msg { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.term-msg::before { content: "› "; }
.term-morse { font-family: var(--mono); font-size: 16px; color: var(--gold); letter-spacing: 4px; }
.term-screen { position: relative; border-radius: 10px; overflow: hidden; border: 1px solid var(--line-2); }
.term-screen img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16/7; filter: saturate(.92) contrast(1.04); }
.term-wave { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; pointer-events: none; }
.term-wave svg { width: 100%; height: 100%; }
.term-status { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 13px; color: var(--muted); }
.term-status .on { color: var(--accent); }
.term-status .on::before { content: "●"; margin-right: 6px; animation: blink 1.6s ease-in-out infinite; }

/* ---------- 通用 section ---------- */
.sec { padding: 72px 0; }
.sec.alt { background: var(--paper-2); }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 3px; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.sec-head h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: -.5px; margin: 14px 0 12px; }
.sec-head p { color: var(--muted); font-size: 16px; }

/* ---------- 发报四步:拟稿 → 发报 → 收报 → 译报 ---------- */
.postal-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; position: relative; }
.pf-step { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 30px 22px; box-shadow: var(--shadow-sm); }
.pf-step::after {
  content: "· − ·"; position: absolute; top: 44px; right: -20px; width: 20px;
  font-family: var(--mono); color: var(--gold); font-size: 13px; letter-spacing: 1px; z-index: 1;
}
.pf-step:last-child::after { display: none; }
.pf-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 8px;
  background: var(--deep); border: 1px solid var(--line-2);
  font-family: var(--mono); font-weight: 700; color: var(--accent); font-size: 15px; letter-spacing: 1px;
}
.pf-h3 { font-size: 19px; font-weight: 800; margin: 16px 0 8px; }
.pf-p { font-size: 14px; color: var(--muted); }

/* ---------- 功能(bento 图片卡) ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature { background: var(--panel); border: 1px solid var(--line); border-radius: 15px; overflow: hidden; box-shadow: var(--shadow-sm); transition: .24s ease; }
.feature:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--line-2); }
.feature-img { aspect-ratio: 16/10; overflow: hidden; background: var(--paper-2); }
.feature-img img { width: 100%; height: 100%; object-fit: cover; transition: .5s ease; }
.feature:hover .feature-img img { transform: scale(1.07); }
.feature-body { padding: 20px 22px 22px; }
.feature-h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.feature-p { font-size: 14px; color: var(--muted); }
.feature.big { grid-column: span 2; grid-row: span 2; display: flex; flex-direction: column; }
.feature.big .feature-img { aspect-ratio: 16/9; }
.feature.big .feature-body { padding: 28px; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.feature.big .feature-h3 { font-size: 24px; }
.feature.big .feature-p { font-size: 16px; }

/* ---------- 全球通电横幅带 ---------- */
.band { position: relative; overflow: hidden; padding: 96px 0; text-align: center; }
.band-bg { position: absolute; inset: 0; background-size: cover; background-position: center; filter: blur(22px) brightness(.45); }
.band-bg::after { content: ""; position: absolute; inset: 0; background: rgba(7, 17, 12, .55); }
.band-inner { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; padding: 0 24px; }
.band-h2 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; letter-spacing: -.5px; color: #fff; }
.band-p { margin: 16px auto 26px; color: #c6d2c6; font-size: 17px; max-width: 600px; }
.band-chips { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.band-chip { font-size: 13px; font-weight: 700; color: var(--accent); background: rgba(19, 42, 31, .8); border: 1px solid var(--line-2); padding: 8px 16px; border-radius: 999px; font-family: var(--mono); letter-spacing: .5px; }

/* ---------- 场景(电报站) ---------- */
.postcards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.postcard { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-sm); transition: .22s ease; }
.postcard:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.pc-img { aspect-ratio: 16/10; overflow: hidden; background: var(--paper-2); }
.pc-img img { width: 100%; height: 100%; object-fit: cover; transition: .5s ease; }
.postcard:hover .pc-img img { transform: scale(1.05); }
.pc-body { padding: 22px; }
.pc-tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--gold); background: var(--deep); padding: 4px 11px; border-radius: 999px; font-family: var(--mono); }
.pc-h3 { font-size: 18px; font-weight: 800; margin: 12px 0 8px; }
.pc-p { font-size: 14px; color: var(--muted); }
.pc-from { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line-2); font-size: 13px; color: var(--ink-2); font-family: var(--mono); }

/* ---------- 下载发报台 ---------- */
.stamps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stamp-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-sm); overflow: hidden; transition: .2s ease; }
.stamp-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--line-2); }
.sc-perf { background: var(--deep); border-bottom: 1px solid var(--line-2); padding: 14px 20px; display: flex; align-items: center; justify-content: space-between; }
.sc-top { font-family: var(--mono); font-size: 11px; letter-spacing: 2px; color: var(--accent); font-weight: 700; }
.sc-no { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.stamp-card .sc-body { padding: 24px 20px 26px; text-align: left; }
.sc-ico { font-size: 30px; line-height: 1; }
.sc-os { font-size: 18px; font-weight: 800; margin: 12px 0 4px; }
.sc-sub { font-size: 13px; color: var(--muted); margin-bottom: 18px; }

/* ---------- 问询台(首页 FAQ) ---------- */
.qanda { max-width: 820px; margin: 0 auto; }
.qa-item { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px 24px; margin-bottom: 14px; }
.qa-q { font-weight: 800; font-size: 16px; display: flex; align-items: center; gap: 10px; }
.qa-q .ico { color: var(--gold); font-family: var(--mono); }
.qa-a { margin-top: 10px; color: var(--ink-2); font-size: 15px; padding-left: 28px; }

/* ---------- 页头(内页) ---------- */
.pagehead { background: var(--paper-2); border-bottom: 1px solid var(--line); padding: 46px 0 42px; text-align: center; }
.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--accent); }
.breadcrumb .sep { margin: 0 8px; color: var(--line-2); }
.pagehead h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; letter-spacing: -.5px; }
.lede { max-width: 720px; margin: 14px auto 0; color: var(--ink-2); font-size: 16px; }
.head-cta { margin-top: 24px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 左右图文 ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.duo.rev .duo-img { order: 2; }
.duo-img { border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line); }
.duo-img img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16/11; }
.duo-txt h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; margin: 12px 0 16px; letter-spacing: -.4px; }
.duo-txt p { color: var(--ink-2); margin-bottom: 14px; }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 8px; }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 28px 22px; text-align: center; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 8px; background: var(--accent); color: #07110c; font-weight: 800; font-family: var(--mono); }
.step h4 { margin: 16px 0 8px; font-size: 17px; font-weight: 800; }
.step p { font-size: 14px; color: var(--muted); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 480px; }
th, td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); }
thead th { background: var(--deep); font-weight: 800; color: var(--ink); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: var(--paper-2); }

/* ---------- 提示 / 警示 ---------- */
.tip, .callout { display: flex; gap: 12px; align-items: flex-start; background: var(--paper-2); border: 1px solid var(--line); border-radius: 11px; padding: 16px 20px; font-size: 14px; color: var(--ink-2); }
.tip .e, .callout .e { flex-shrink: 0; }
.callout { background: #162418; border-color: #33513a; }

/* ---------- CTA 带 ---------- */
.cta-band { background: var(--deep); color: #d8cba4; border-radius: 18px; padding: 48px 32px; text-align: center; position: relative; overflow: hidden; border: 1px solid var(--line-2); }
.cta-band h2 { color: #fff; font-size: clamp(24px, 3vw, 32px); font-weight: 800; }
.cta-band p { margin: 12px auto 24px; max-width: 560px; color: #9fa88f; }

/* ---------- 文章页 ---------- */
.article-head { background: var(--paper-2); border-bottom: 1px solid var(--line); padding: 46px 0 40px; text-align: center; }
.article-head h1 { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; letter-spacing: -.5px; }
.meta { margin-top: 18px; font-size: 13px; color: var(--muted); display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; }
.meta b { color: var(--ink-2); }
.article-body { padding: 48px 0 8px; }
.article-cols { display: grid; grid-template-columns: 240px 1fr; gap: 48px; align-items: start; }

.toc { position: sticky; top: 92px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.toc h5 { font-size: 13px; letter-spacing: 1px; color: var(--muted); margin-bottom: 12px; }
.toc ol { list-style: none; }
.toc li { margin-bottom: 9px; }
.toc a { font-size: 14px; color: var(--ink-2); }
.toc a:hover { color: var(--accent); }
.toc .num { font-family: var(--mono); color: var(--accent); margin-right: 8px; font-size: 12px; }

.prose { max-width: 720px; font-size: 16px; color: var(--ink-2); }
.prose h2 { font-size: 24px; font-weight: 800; color: var(--ink); margin: 30px 0 14px; }
.prose p { margin-bottom: 16px; }
.prose ul, .prose ol { margin: 0 0 16px 22px; }
.prose li { margin-bottom: 8px; }
.prose blockquote { border-left: 3px solid var(--accent); background: var(--paper-2); padding: 14px 20px; border-radius: 0 10px 10px 0; margin: 0 0 16px; color: var(--ink); }
.prose figure { margin: 22px 0; }
.prose figure img { border-radius: 12px; box-shadow: var(--shadow-sm); }
.prose figcaption { font-size: 13px; color: var(--muted); text-align: center; margin-top: 10px; }

/* ---------- 相关阅读 ---------- */
.related { max-width: 860px; margin: 0 auto; }
.rel-list { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.rel-item { background: var(--panel); border: 1px solid var(--line); border-radius: 11px; transition: .2s; }
.rel-item a { padding: 18px 20px; }
.rel-item:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.rel-item .tag { display: inline-block; font-size: 11px; font-weight: 700; color: var(--gold); background: var(--deep); padding: 2px 9px; border-radius: 999px; }
.rel-item h4 { font-size: 15px; font-weight: 700; color: var(--ink); }
.rel-item .go { margin-left: auto; color: var(--line-2); font-size: 20px; }

/* ---------- 分享 ---------- */
.share { margin-top: 34px; padding-top: 20px; border-top: 1px dashed var(--line-2); display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.share-lbl { font-family: var(--mono); font-size: 12px; letter-spacing: 2px; color: var(--muted); text-transform: uppercase; }
.share a { font-size: 14px; font-weight: 600; color: var(--accent); }
.share a:hover { text-decoration: underline; }

/* ---------- FAQ 页 ---------- */
.faq-group h2 { font-size: 22px; font-weight: 800; margin-bottom: 16px; }
.faq-group details { background: var(--panel); border: 1px solid var(--line); border-radius: 11px; margin-bottom: 12px; padding: 0 20px; }
.faq-group summary { cursor: pointer; font-weight: 700; padding: 16px 0; list-style: none; }
.faq-group summary::after { content: "＋"; float: right; color: var(--accent); }
.faq-group details[open] summary::after { content: "－"; }
.faq-a { padding: 0 0 16px; color: var(--ink-2); font-size: 15px; }

/* ---------- 页脚 ---------- */
.foot { background: var(--deep); color: #9fa88f; margin-top: 24px; border-top: 1px solid var(--line); }
.foot-inner { max-width: 1120px; margin: 0 auto; padding: 40px 24px 28px; display: flex; flex-direction: column; gap: 20px; }
.foot-line { color: #d8cba4; font-size: 15px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot-links a { color: #9fa88f; font-size: 14px; }
.foot-links a:hover { color: var(--gold); }
.foot-cr { border-top: 1px dashed rgba(216, 169, 63, .18); text-align: center; padding: 18px 24px; font-size: 13px; color: #6f7f72; }

/* ---------- 返回顶部 ---------- */
.backtop { position: fixed; right: 22px; bottom: 26px; width: 46px; height: 46px; border-radius: 50%; background: var(--accent); color: #07110c; font-size: 20px; border: none; cursor: pointer; opacity: 0; visibility: hidden; transition: .2s; box-shadow: 0 8px 20px rgba(62, 192, 138, .3); z-index: 40; }
.backtop.show { opacity: 1; visibility: visible; }
.backtop:hover { background: var(--accent-2); }

/* ---------- 工具页 ---------- */
.center { padding: 90px 0; text-align: center; }
.center h1 { font-size: clamp(44px, 8vw, 72px); font-weight: 800; }
.center p { color: var(--muted); margin: 12px 0 24px; }
.search-box { display: flex; gap: 12px; max-width: 520px; margin: 0 auto; }
.search-box input { flex: 1; padding: 14px 18px; border: 1px solid var(--line-2); border-radius: 11px; font-size: 15px; font-family: var(--sans); background: var(--panel); color: var(--ink); }
.search-box input:focus { outline: none; border-color: var(--accent); }
.sitemap-list { list-style: none; text-align: left; max-width: 720px; margin: 0 auto; }
.sitemap-list .grp { display: block; font-weight: 800; font-size: 17px; color: var(--accent); margin: 26px 0 10px; }
.sitemap-list li { margin-bottom: 8px; }
.sitemap-list a { color: var(--ink-2); }
.sitemap-list a:hover { color: var(--accent); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .postal-flow { grid-template-columns: repeat(2, 1fr); }
  .pf-step::after { display: none; }
  .features, .postcards, .stamps { grid-template-columns: repeat(2, 1fr); }
  .feature.big { grid-column: span 2; grid-row: span 1; }
  .duo { grid-template-columns: 1fr; gap: 28px; }
  .article-cols { grid-template-columns: 1fr; }
  .toc { position: static; }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: var(--panel); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 14px 20px; gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-links > a, .dd > button { width: 100%; justify-content: space-between; }
  .dd-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding: 0 0 0 14px; }
  .nav-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
}
@media (max-width: 560px) {
  .features, .postcards, .stamps, .postal-flow { grid-template-columns: 1fr; }
  .feature.big { grid-column: span 1; }
  .steps { grid-template-columns: 1fr; }
  .rel-list { grid-template-columns: 1fr; }
  .mast { padding: 56px 0 56px; }
  .band { padding: 64px 0; }
  .terminal-body { padding: 18px 16px 20px; }
  .term-morse { font-size: 13px; letter-spacing: 2px; }
}

/* ==== 补分板块样式(自动生成) ==== */
.body-copy { max-width: 820px; }
.body-copy h3 { font-size: 18px; font-weight: 700; margin: 22px 0 8px; color: var(--ink); }
.body-copy p { color: var(--muted); line-height: 1.85; margin-bottom: 14px; font-size: 15px; }
.rv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 8px; }
.rv-card { border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 20px; background: var(--panel); }
.rv-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.rv-name { font-weight: 700; color: var(--ink); font-size: 15px; }
.rv-role { font-size: 12px; color: var(--muted); background: rgba(255,255,255,.14); padding: 2px 10px; border-radius: 999px; }
.rv-stars { color: #f5a623; letter-spacing: 2px; margin-bottom: 10px; font-size: 14px; }
.rv-body { color: var(--muted); line-height: 1.7; font-size: 14px; margin: 0; }