/* =========================================================
   全国县区名称邮编查询 · 样式（响应式 / 语义化 / 渐进增强）
   ========================================================= */
:root {
  --green:      #007a3d;
  --green-dark: #005f2f;
  --green-light:#e8f5ee;
  --red:        #c8102e;
  --text:       #1f2328;
  --text-sub:   #656d76;
  --border:     #e1e4e8;
  --bg:         #f4f7f6;
  --card:       #ffffff;
  --shadow:     0 1px 3px rgba(0,0,0,.06), 0 10px 30px rgba(0,0,0,.05);
  --radius:     12px;
  --maxw:       960px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }

/* ---------- 顶部 ---------- */
.site-header {
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%);
  color: #fff;
  box-shadow: 0 2px 14px rgba(0,122,61,.22);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: #fff; }
.logo {
  width: 44px; height: 44px; flex: none;
  background: rgba(255,255,255,.18);
  border: 1.5px solid rgba(255,255,255,.5);
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  font-size: 21px; font-weight: 700;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-size: 19px; font-weight: 600; letter-spacing: .5px; }
.brand-slogan { font-size: 12px; opacity: .82; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: rgba(255,255,255,.82); text-decoration: none; font-size: 14px;
  padding: 7px 13px; border-radius: 8px; transition: all .16s;
}
.site-nav a:hover { color: #fff; background: rgba(255,255,255,.12); }
.site-nav a[aria-current="page"] { color: #fff; background: rgba(255,255,255,.18); font-weight: 600; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 12px 16px 0; font-size: 12.5px; color: var(--text-sub); }
.breadcrumb a { color: var(--green-dark); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- 主体 ---------- */
.main { padding: 18px 16px 44px; }

/* ---------- Hero ---------- */
.hero {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 30px 28px 28px; text-align: center; margin-bottom: 20px;
}
.hero h1 { font-size: 27px; font-weight: 700; letter-spacing: .5px; }
.hero-lead { font-size: 14.5px; color: var(--text-sub); margin: 12px auto 20px; max-width: 720px; }
.hero-lead b { color: var(--green-dark); }
.hero-search { display: flex; gap: 10px; max-width: 620px; margin: 0 auto; }
.hero-search input {
  flex: 1; height: 48px; padding: 0 16px; font-size: 15px; font-family: inherit;
  border: 1px solid var(--border); border-radius: 9px; outline: none;
  transition: border-color .18s, box-shadow .18s;
}
.hero-search input:focus { border-color: var(--green); box-shadow: 0 0 0 3px var(--green-light); }

/* ---------- 按钮 ---------- */
.btn-primary {
  height: 48px; padding: 0 30px; font-size: 15px; font-weight: 600; font-family: inherit;
  color: #fff; background: var(--green); border: none; border-radius: 9px;
  cursor: pointer; transition: background .18s, transform .1s; white-space: nowrap;
}
.btn-primary:hover { background: var(--green-dark); }
.btn-primary:active { transform: scale(.98); }
.btn-ghost {
  display: inline-block; font-size: 13.5px; font-family: inherit; color: var(--green-dark);
  background: #fff; border: 1px solid var(--green); padding: 9px 20px; border-radius: 8px;
  cursor: pointer; text-decoration: none; transition: all .16s; white-space: nowrap;
}
.btn-ghost:hover { background: var(--green); color: #fff; }

/* ---------- 工具卡片 ---------- */
.tool {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  overflow: hidden; padding: 6px 22px 22px;
}
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 0 -22px 18px; }
.tab {
  flex: 1; background: transparent; border: none; color: var(--text-sub);
  font-size: 14.5px; font-family: inherit; padding: 14px 10px; cursor: pointer;
  border-bottom: 2.5px solid transparent; transition: all .16s;
}
.tab:hover { color: var(--green-dark); }
.tab.active { color: var(--green-dark); font-weight: 600; border-bottom-color: var(--green); }

.panel { animation: fade .22s ease; }
.panel[hidden] { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.panel-head { margin-bottom: 16px; }
.panel-head h2 { font-size: 17px; font-weight: 600; }
.panel-head .sub { font-size: 13px; color: var(--text-sub); margin-top: 4px; }

/* ---------- 联动选择 ---------- */
.cascade {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
  background: var(--bg); padding: 18px; border-radius: 10px;
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field label { font-size: 13px; color: var(--text-sub); font-weight: 500; }
.field select {
  width: 100%; height: 44px; padding: 0 12px; font-size: 14.5px; font-family: inherit;
  color: var(--text); border: 1px solid var(--border); border-radius: 8px; background: #fff;
  cursor: pointer; outline: none; transition: border-color .18s, box-shadow .18s; appearance: none;
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%23656d76' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
}
.field select:focus { border-color: var(--green); box-shadow: 0 0 0 3px var(--green-light); }
.field select:disabled { background-color: #eef1f3; color: #9aa4b0; cursor: not-allowed; }

/* ---------- 搜索条 ---------- */
.search-bar { display: flex; gap: 10px; }
.search-bar input {
  flex: 1; height: 46px; padding: 0 16px; font-size: 15px; font-family: inherit;
  border: 1px solid var(--border); border-radius: 8px; outline: none;
  transition: border-color .18s, box-shadow .18s;
}
.search-bar input:focus { border-color: var(--green); box-shadow: 0 0 0 3px var(--green-light); }

/* ---------- 热门标签 ---------- */
.quick-tags { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin: 14px 2px 0; }
.tag-label { font-size: 13px; color: var(--text-sub); }
.tag {
  font-size: 13px; font-family: inherit; color: var(--green-dark);
  background: var(--green-light); border: 1px solid transparent; padding: 5px 13px;
  border-radius: 20px; cursor: pointer; transition: all .16s;
}
.tag:hover { background: var(--green); color: #fff; }

/* ---------- 结果区 ---------- */
.result-box { margin-top: 18px; }
.empty {
  background: var(--bg); border-radius: 10px; padding: 50px 20px; text-align: center;
  color: var(--text-sub);
}
.empty-ico { font-size: 34px; margin-bottom: 10px; opacity: .75; }
.empty p { font-size: 14px; }

/* 邮编大卡片 */
.pc-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.pc-main {
  padding: 26px 24px; background: linear-gradient(135deg, var(--green-light), #f7fbf9);
  border-bottom: 1px solid var(--border); text-align: center;
}
.pc-main .pc-label { font-size: 13px; color: var(--text-sub); letter-spacing: 1px; }
.pc-main .pc-code {
  font-size: 44px; font-weight: 700; color: var(--green-dark); letter-spacing: 5px;
  font-family: "SF Mono", "Consolas", "Monaco", monospace; margin: 6px 0 4px; user-select: all;
}
.pc-main .pc-path { font-size: 14.5px; color: var(--text); }
.pc-main .pc-path b { font-weight: 600; }
.pc-actions { display: flex; gap: 10px; justify-content: center; margin-top: 16px; }

/* 上下级邮编列表 */
.pc-rel-title { font-size: 13px; color: var(--text-sub); padding: 12px 24px 6px; font-weight: 500; }
.pc-rel-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
.pc-rel-item {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 10px 24px; font-size: 14px; border-top: 1px solid #f0f2f4; cursor: pointer; transition: background .14s;
}
.pc-rel-item:hover { background: #f7fbf9; }
.pc-rel-item .name { color: var(--text); }
.pc-rel-item .code { font-family: "SF Mono", "Consolas", monospace; color: var(--green-dark); font-weight: 600; font-size: 13.5px; }

/* 搜索结果 */
.res-table { background: var(--card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.res-head { padding: 14px 20px; border-bottom: 1px solid var(--border); font-size: 13.5px; color: var(--text-sub); }
.res-head b { color: var(--green-dark); font-size: 15px; }
.res-list { max-height: 560px; overflow-y: auto; }
.res-row {
  display: grid; grid-template-columns: 1fr 1.6fr 1fr auto; gap: 12px; align-items: center;
  padding: 12px 20px; border-bottom: 1px solid #f0f2f4; font-size: 14px; cursor: pointer; transition: background .14s;
}
.res-row:hover { background: #f7fbf9; }
.res-row:last-child { border-bottom: none; }
.res-row .prov { color: var(--text-sub); font-size: 13px; }
.res-row .city { color: var(--text); }
.res-row .dist { color: var(--text); font-weight: 500; }
.res-row .pc { font-family: "SF Mono", "Consolas", monospace; font-weight: 700; color: var(--green-dark); font-size: 15px; letter-spacing: .5px; }
.res-mark { color: var(--red); font-weight: 600; }

/* ---------- 文档区（帮助/FAQ/数据说明） ---------- */
.doc {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 26px; margin-top: 18px;
}
.doc-title { font-size: 18px; font-weight: 700; margin-bottom: 14px; padding-left: 12px; position: relative; }
.doc-title::before { content: ""; position: absolute; left: 0; top: 4px; bottom: 4px; width: 4px; border-radius: 2px; background: var(--green); }
.howto { list-style: none; counter-reset: step; display: grid; gap: 12px; }
.howto li { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; }
.howto-step {
  counter-increment: step; background: var(--green-light); color: var(--green-dark);
  font-weight: 600; font-size: 13.5px; padding: 5px 12px; border-radius: 7px; white-space: nowrap;
  position: relative;
}
.howto-step::before { content: counter(step) ". "; }
.howto-desc { font-size: 14px; color: var(--text); padding-top: 3px; }

/* FAQ 折叠 */
.faq-list { display: grid; gap: 10px; }
.faq-item { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg); }
.faq-item summary {
  cursor: pointer; padding: 14px 18px; font-size: 14.5px; font-weight: 600; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--green-dark); font-size: 20px; font-weight: 400; transition: transform .2s; }
.faq-item[open] summary::after { content: "−"; }
.faq-a { padding: 0 18px 14px; font-size: 14px; color: var(--text-sub); line-height: 1.8; }

/* 数据说明 */
.notice p { font-size: 13.5px; color: #5b5535; line-height: 1.85; }
.notice-tip { margin-top: 10px; font-size: 13px; color: #7a6f45; }
.notice-tip b { color: #5b5535; }

/* ---------- 底部 ---------- */
.site-footer { border-top: 1px solid var(--border); background: #fff; padding: 24px 0; text-align: center; margin-top: 26px; }
.footer-nav { font-size: 13px; margin-bottom: 8px; }
.footer-nav a { color: var(--green-dark); text-decoration: none; }
.footer-nav a:hover { text-decoration: underline; }
.footer-meta { font-size: 12.5px; color: var(--text-sub); }
.footer-copy { font-size: 12px; color: var(--text-sub); margin-top: 4px; }
.footer-icp { font-size: 12px; color: var(--text-sub); margin-top: 2px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: rgba(31,35,40,.92); color: #fff; font-size: 13.5px; padding: 10px 22px;
  border-radius: 8px; opacity: 0; pointer-events: none; transition: all .25s; z-index: 999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 404 ---------- */
.notfound { padding: 70px 20px; }
.notfound h1 { font-size: 22px; margin: 6px 0 10px; }
.notfound-actions { margin-top: 18px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .header-inner { padding: 12px 14px; }
  .brand-slogan { display: none; }
  .logo { width: 40px; height: 40px; font-size: 19px; }
  .brand-name { font-size: 17px; }
  .site-nav a { padding: 6px 10px; font-size: 13px; }
  .breadcrumb { padding: 10px 14px 0; }
  .main { padding: 14px 14px 36px; }
  .hero { padding: 24px 18px; }
  .hero h1 { font-size: 22px; }
  .hero-search { flex-direction: column; }
  .hero-search .btn-primary { width: 100%; }
  .tool { padding: 4px 14px 18px; }
  .tabs { margin: 0 -14px 16px; }
  .tab { padding: 12px 6px; font-size: 13.5px; }
  .cascade { grid-template-columns: 1fr; gap: 12px; padding: 16px; }
  .search-bar { flex-direction: column; }
  .search-bar .btn-primary { width: 100%; }
  .pc-main .pc-code { font-size: 34px; letter-spacing: 3px; }
  .pc-rel-list { grid-template-columns: 1fr; }
  .doc { padding: 18px 16px; }
  .res-row { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; padding: 12px 16px; }
  .res-row .prov { width: 100%; order: 2; font-size: 12px; }
  .res-row .city { order: 1; }
  .res-row .dist { order: 1; }
  .res-row .pc { order: 1; margin-left: auto; font-size: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .panel { animation: none; }
}

/* 防下载 / 防采 / 防扒：禁止在受保护区域内选中文本 */
.no-copy { -webkit-user-select: none; -moz-user-select: none; user-select: none; }

/* 分类目录（省 / 市 / 区县） */
.dir-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; margin-top: 14px; }
.dir-prov, .dir-item {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 12px 14px; border: 1px solid #e3e8e3; border-radius: 10px;
  background: #fff; color: #1a2b22; text-decoration: none; font-size: 15px; font-weight: 600;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.dir-prov:hover, .dir-item:hover { border-color: #007a3d; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0,122,61,.12); }
.dir-meta { font-size: 12px; font-weight: 400; color: #6b7c72; }
.dir-tip { margin-top: 16px; font-size: 13px; color: #6b7c72; line-height: 1.7; }

/* 区县邮编列表 */
.dist-list { margin-top: 14px; border: 1px solid #e3e8e3; border-radius: 12px; overflow: hidden; }
.dist-row { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-top: 1px solid #eef2ef; }
.dist-row:first-child { border-top: 0; }
.dist-row:nth-child(even) { background: #fafcfb; }
.dist-name { flex: 1; font-size: 15px; font-weight: 600; color: #1a2b22; }
.dist-code { font-family: "SFMono-Regular", Consolas, monospace; font-size: 18px; letter-spacing: 2px; color: #007a3d; font-weight: 700; }
.dist-copy { margin-left: auto; }