/* ============================================================
   base.css — 全站共享基础样式
   信阳八大员报考网 pcrn.cn · 牛仔裤复古风设计系统
   设计基调：复古蓝 + 米白 + 深棕，双缝线/皮标/铆钉/做旧质感
   作者：豆包 · 2026
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 牛仔裤复古蓝 */
  --denim-900: #22384f;
  --denim-800: #2c4a66;
  --denim-700: #33506e;
  --denim-600: #3b5b7c;
  --denim-500: #4a6d90;
  --denim-300: #7d97b3;
  --denim-100: #dbe4ee;

  /* 米白纸色 */
  --paper-100: #faf6ee;
  --paper-200: #f6f1e7;
  --paper-300: #efe7d6;
  --paper-400: #e4dac4;

  /* 深棕皮革色 */
  --brown-900: #3c2a1f;
  --brown-800: #4e3629;
  --brown-700: #6b4a32;
  --brown-600: #85634a;
  --brown-400: #a8876c;
  --brown-200: #d9c7b0;

  /* 缝线米黄 / 强调 */
  --stitch: #e9dcc3;
  --khaki: #c2b28c;
  --rust: #b4704a;

  /* 中性 */
  --ink: #2b2a26;
  --ink-soft: #57544e;
  --line: #cfc3aa;
  --white: #ffffff;

  /* 字体 */
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "SimSun", "Noto Serif SC", serif;

  /* 圆角 / 阴影 */
  --r-sm: 4px;
  --r-md: 10px;
  --r-lg: 18px;
  --shadow-sm: 0 2px 10px rgba(34, 56, 79, .08);
  --shadow-md: 0 10px 28px rgba(34, 56, 79, .12);
  --shadow-lg: 0 18px 44px rgba(34, 56, 79, .16);

  /* 容器 */
  --wrap: 1200px;
  --gutter: 24px;

  /* 过渡 */
  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 2. 重置与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper-100);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255,255,255,.6), transparent 42%),
    radial-gradient(circle at 88% 90%, rgba(224,214,186,.5), transparent 46%);
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: var(--denim-700); text-decoration: none; transition: color .25s var(--ease); }
a:hover { color: var(--brown-700); }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, textarea, select { font: inherit; }
::selection { background: var(--denim-700); color: var(--paper-100); }

h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.35; color: var(--denim-900); }

/* 无障碍：跳过导航 */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 9999;
  background: var(--denim-800); color: var(--paper-100);
  padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- 3. 布局容器 ---------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.wrap-narrow { max-width: 920px; margin: 0 auto; padding: 0 var(--gutter); }

/* 牛仔布底纹背景块 */
.denim-bg {
  background-color: var(--denim-700);
  background-image:
    linear-gradient(115deg, rgba(255,255,255,.045) 0 34%, transparent 34% 68%, rgba(255,255,255,.03) 68%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.016) 0 2px, transparent 2px 9px),
    repeating-linear-gradient(0deg, rgba(0,0,0,.05) 0 1px, transparent 1px 7px);
  color: var(--paper-100);
}
.denim-bg h1, .denim-bg h2, .denim-bg h3, .denim-bg h4 { color: var(--paper-100); }

.paper-bg { background-color: var(--paper-200); }
.paper-bg-deep { background-color: var(--paper-300); }

/* ---------- 4. 双缝线装饰 ---------- */
/* 通用：元素下方两道平行的缝线，模拟牛仔衣车线 */
.stitch-bottom { position: relative; }
.stitch-bottom::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -10px;
  height: 4px;
  background:
    repeating-linear-gradient(90deg, var(--brown-600) 0 10px, transparent 10px 14px),
    repeating-linear-gradient(90deg, var(--denim-500) 0 10px, transparent 10px 14px);
  background-position: 0 0, 0 3px;
  background-size: 14px 2px, 14px 2px;
  background-repeat: repeat-x;
  opacity: .85;
}

/* 皮标（小号标签） */
.leather-tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--brown-800); color: var(--stitch);
  font-size: 12px; letter-spacing: 1px; line-height: 1;
  padding: 6px 12px 6px 8px;
  border-radius: 2px 6px 6px 2px;
  position: relative;
  text-transform: uppercase;
  box-shadow: 0 2px 6px rgba(60,42,31,.25);
}
.leather-tag::before {
  content: ""; width: 4px; height: 4px; border-radius: 50%;
  background: var(--stitch); opacity: .8;
}
.leather-tag--light { background: var(--brown-600); }

/* 铆钉点装饰 */
.rivets {
  position: relative;
}
.rivets::before, .rivets::after {
  content: ""; position: absolute; width: 7px; height: 7px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #e8d9c0, var(--brown-700) 60%);
  box-shadow: inset 0 1px 2px rgba(255,255,255,.35), 0 1px 2px rgba(0,0,0,.35);
}
.rivets::before { top: 10px; left: 10px; }
.rivets::after  { top: 10px; right: 10px; }

/* 胶带贴纸角 */
.tape-corner { position: relative; }
.tape-corner::before {
  content: ""; position: absolute; top: -14px; left: 50%;
  transform: translateX(-50%) rotate(-3deg);
  width: 110px; height: 24px;
  background: rgba(233,220,195,.75);
  border-left: 2px dashed rgba(255,255,255,.4);
  border-right: 2px dashed rgba(255,255,255,.4);
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
  z-index: 2;
}

/* ---------- 5. 排版 ---------- */
.sec { padding: 84px 0; }
.sec-tight { padding: 60px 0; }

.sec-head { max-width: 720px; margin-bottom: 44px; position: relative; }
.sec-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head .kicker {
  display: inline-block;
  font-size: 13px; letter-spacing: 4px; color: var(--brown-700);
  margin-bottom: 10px; font-weight: 600;
}
.sec-head h2 { font-size: clamp(28px, 4vw, 40px); letter-spacing: 1px; }
.sec-head h2 em { font-style: normal; color: var(--denim-600); }
.sec-head p.lead { margin-top: 12px; color: var(--ink-soft); font-size: 16px; }
.sec-head--line h2::after {
  content: ""; display: block; margin-top: 14px; width: 74px; height: 5px;
  background: repeating-linear-gradient(90deg, var(--brown-600) 0 12px, transparent 12px 16px);
}

/* 章节编号：做旧水印数字 */
.sec-num {
  font-family: var(--font-serif);
  font-size: 92px; line-height: 1; font-weight: 900;
  color: rgba(34,56,79,.07);
  position: absolute; right: 0; top: -26px; z-index: -1;
  user-select: none;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px;
  border-radius: var(--r-sm);
  font-size: 15px; font-weight: 600; letter-spacing: 1px;
  transition: all .28s var(--ease);
  border: 2px solid transparent;
  position: relative; overflow: hidden;
}
.btn svg { width: 17px; height: 17px; flex: none; }

.btn-denim {
  background: var(--denim-700); color: var(--paper-100);
  border-color: var(--denim-800);
  box-shadow: inset 0 0 0 3px rgba(255,255,255,.07), 0 4px 14px rgba(34,56,79,.28);
}
.btn-denim:hover { background: var(--denim-800); color: #fff; transform: translateY(-2px); box-shadow: inset 0 0 0 3px rgba(255,255,255,.09), 0 8px 20px rgba(34,56,79,.32); }

.btn-paper {
  background: var(--paper-100); color: var(--denim-800);
  border-color: var(--paper-100);
}
.btn-paper:hover { background: #fff; transform: translateY(-2px); }

.btn-outline {
  background: transparent; color: var(--denim-700);
  border-color: var(--denim-600);
}
.btn-outline:hover { background: var(--denim-700); color: var(--paper-100); transform: translateY(-2px); }

.btn-leather {
  background: var(--brown-800); color: var(--stitch);
  border-color: var(--brown-900);
}
.btn-leather:hover { background: var(--brown-700); color: #fff; transform: translateY(-2px); }

.btn-sm { padding: 9px 18px; font-size: 13.5px; }

/* ---------- 7. 顶部导航 ---------- */
.site-nav {
  position: fixed; inset: 0 0 auto 0; z-index: 1000;
  background: rgba(250,246,238,.92);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid rgba(59,91,124,.12);
  transition: background .35s var(--ease), box-shadow .35s var(--ease);
}
.site-nav::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--denim-500) 0 9px, transparent 9px 13px);
  opacity: .5;
}
/* 滚动后加深 */
.site-nav.is-scrolled {
  background: rgba(35,58,82,.97);
  box-shadow: 0 6px 22px rgba(34,56,79,.3);
}
.site-nav.is-scrolled .nav-link,
.site-nav.is-scrolled .nav-brand-text b,
.site-nav.is-scrolled .nav-brand-text i { color: var(--paper-100); }
.site-nav.is-scrolled .nav-brand-text i { color: var(--stitch); }

.nav-inner {
  max-width: var(--wrap); margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}

.nav-brand { display: flex; align-items: center; gap: 12px; flex: none; }
.nav-brand img {
  width: 42px; height: 42px; object-fit: cover;
  border-radius: 4px; box-shadow: 0 2px 6px rgba(0,0,0,.2);
  border: 2px solid rgba(255,255,255,.5);
}
.nav-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand-text b { font-size: 18px; letter-spacing: 2px; color: var(--denim-800); transition: color .3s; }
.nav-brand-text i { font-style: normal; font-size: 11px; letter-spacing: 2px; color: var(--brown-700); margin-top: 2px; }

.nav-menu { display: flex; align-items: center; }
.nav-menu ul { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-menu ul > li { position: relative; flex: none; }
.nav-link {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 10px 13px; font-size: 15px; font-weight: 600;
  color: var(--denim-800); border-radius: 6px;
  white-space: nowrap;
  transition: color .25s, background .25s;
}
.nav-link:hover { color: var(--brown-700); background: rgba(59,91,124,.08); }
.nav-link .caret {
  width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px); transition: transform .3s;
}
.nav-item:hover .caret { transform: rotate(225deg) translateY(-1px); }
.nav-link.is-active { color: var(--brown-700); }
.nav-link.is-active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 6px; height: 2px;
  background: repeating-linear-gradient(90deg, var(--brown-700) 0 7px, transparent 7px 11px);
}

/* 下拉面板 */
.drop-panel {
  position: absolute; top: calc(100% + 12px); left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 190px;
  background: var(--paper-100);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  padding: 10px;
  opacity: 0; visibility: hidden;
  transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s;
  z-index: 1001;
}
.drop-panel::before {
  content: ""; position: absolute; top: -7px; left: 50%; transform: translateX(-50%) rotate(45deg);
  width: 14px; height: 14px; background: var(--paper-100); border-left: 1px solid var(--line); border-top: 1px solid var(--line);
}
.nav-item:hover .drop-panel,
.nav-item:focus-within .drop-panel { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.drop-panel a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 12px; border-radius: 6px; font-size: 14px; color: var(--ink-soft);
  transition: background .2s, color .2s, padding-left .2s;
}
.drop-panel a:hover { background: var(--denim-100); color: var(--denim-800); padding-left: 16px; }
.drop-panel a small { font-size: 11px; color: var(--brown-600); }
.drop-panel--wide { min-width: 260px; }
.drop-panel--grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; min-width: 340px; }

/* 汉堡按钮 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; z-index: 1100; }
.nav-toggle span {
  width: 26px; height: 3px; border-radius: 2px;
  background: var(--denim-800); transition: transform .3s var(--ease), opacity .3s, background .3s;
}
.site-nav.is-scrolled .nav-toggle span { background: var(--paper-100); }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 8. 页脚 ---------- */
.site-foot { background: var(--denim-900); color: #c9d2dc; position: relative; }
.site-foot::before {
  content: ""; display: block; height: 6px;
  background:
    repeating-linear-gradient(90deg, var(--denim-500) 0 14px, transparent 14px 18px),
    repeating-linear-gradient(90deg, var(--brown-700) 0 14px, transparent 14px 18px);
  background-position: 0 0, 0 3px; background-size: 18px 3px, 18px 3px;
}
.foot-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px;
  padding: 64px 0 46px;
}
.foot-brand p { margin-top: 14px; font-size: 14px; line-height: 1.9; color: #9db0c2; }
.foot-brand .foot-logo { display: flex; align-items: center; gap: 10px; }
.foot-brand .foot-logo img { width: 40px; height: 40px; object-fit: cover; border-radius: 4px; border: 2px solid rgba(255,255,255,.35); }
.foot-brand .foot-logo b { color: var(--paper-100); letter-spacing: 2px; font-size: 17px; }

.foot-col h4 {
  color: var(--stitch); font-size: 14px; letter-spacing: 3px;
  margin-bottom: 18px; font-weight: 600;
}
.foot-col h4::after { content: ""; display: block; width: 34px; height: 3px; margin-top: 8px;
  background: repeating-linear-gradient(90deg, var(--brown-600) 0 8px, transparent 8px 12px); }
.foot-col a { display: block; color: #a9bac9; font-size: 14px; padding: 5px 0; transition: color .2s, padding-left .2s; }
.foot-col a:hover { color: var(--stitch); padding-left: 6px; }
.foot-contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: #a9bac9; padding: 7px 0; }
.foot-contact svg { width: 16px; height: 16px; flex: none; margin-top: 4px; color: var(--brown-400); }
.foot-contact a { padding: 0; color: inherit; }
.foot-contact a:hover { color: var(--stitch); }

.foot-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 18px 0;
  font-size: 13px; color: #8ba0b5; text-align: center;
}
.foot-bottom a { color: #b9c7d4; }
.foot-bottom a:hover { color: var(--stitch); }

/* ---------- 9. 滚动渐入动画 ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(28px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--rd, 0s);
}
[data-reveal="left"] { transform: translateX(-34px); }
[data-reveal="right"] { transform: translateX(34px); }
[data-reveal="zoom"] { transform: scale(.94); }
[data-reveal].is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 10. 通用小件 ---------- */
/* 图章/水印徽标 */
.badge-round {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--denim-700); color: var(--paper-100);
  border: 2px dashed rgba(255,255,255,.5);
  box-shadow: inset 0 0 0 4px rgba(255,255,255,.08);
  font-weight: 700; font-size: 18px; letter-spacing: 1px;
}

/* 标签 */
.tag {
  display: inline-block; font-size: 12px; letter-spacing: 1px;
  padding: 4px 10px; border-radius: 3px;
  background: var(--paper-300); color: var(--brown-800);
  border: 1px solid var(--line);
}

/* 面包屑 */
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 13px; color: var(--ink-soft); }
.crumbs a { color: var(--denim-600); }
.crumbs .sep { color: var(--brown-400); }

/* 响应式断点 */
@media (max-width: 1080px) {
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
  .nav-menu ul { gap: 0; }
  .nav-link { padding: 10px 6px; font-size: 13.5px; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; inset: 72px 0 auto 0; z-index: 1050;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--denim-800);
    padding: 14px var(--gutter) 26px;
    max-height: calc(100vh - 72px); overflow-y: auto;
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: transform .3s var(--ease), opacity .3s, visibility .3s;
  }
  .nav-menu.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav-menu ul { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  .nav-menu ul > li { border-bottom: 1px dashed rgba(255,255,255,.16); }
  .nav-menu ul > li:last-child { border-bottom: 0; }
  .nav-link { color: var(--paper-100); width: 100%; padding: 13px 6px; font-size: 16px; justify-content: space-between; }
  .nav-link:hover { background: rgba(255,255,255,.08); color: var(--stitch); }
  .drop-panel {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: 0; border-radius: 0; background: transparent;
    padding: 0 6px 10px; max-height: 0; overflow: hidden; min-width: 0;
    transition: max-height .4s var(--ease), padding .4s;
  }
  .drop-panel::before { display: none; }
  .nav-item.is-open .drop-panel { max-height: 420px; padding-top: 4px; }
  .drop-panel a { color: #c7d3df; font-size: 14px; padding: 8px 10px; }
  .drop-panel--grid { grid-template-columns: 1fr 1fr; min-width: 0; }
  .nav-cta-mobile { margin-top: 12px; }
}

@media (max-width: 640px) {
  .sec { padding: 58px 0; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .nav-brand-text b { font-size: 16px; }
  .nav-brand-text i { font-size: 10px; }
}

/* ---------- 11. 表单通用件（各页面可在此基础上个性化） ---------- */
.form-field { margin-bottom: 20px; }
.form-field label { display: block; font-size: 14px; font-weight: 600; color: var(--denim-800); margin-bottom: 8px; letter-spacing: 1px; }
.form-field label i { font-style: normal; color: var(--rust); }
.form-field input,
.form-field textarea,
.form-field select {
  width: 100%; padding: 12px 14px;
  border: 2px solid var(--line); border-radius: var(--r-sm);
  background: var(--paper-100); color: var(--ink);
  transition: border-color .25s, box-shadow .25s;
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none; border-color: var(--denim-500);
  box-shadow: 0 0 0 3px rgba(59,91,124,.15);
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input.is-invalid,
.form-field textarea.is-invalid { border-color: var(--rust); }
.field-error { font-size: 13px; color: var(--rust); margin-top: 6px; }
.form-tip {
  font-size: 14px; color: var(--brown-800);
  background: var(--paper-300); border: 1px dashed var(--brown-400);
  padding: 10px 14px; border-radius: var(--r-sm);
  opacity: 0; transform: translateY(6px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
  display: none;
}
.form-tip.is-show { opacity: 1; transform: none; display: block; }

/* ---------- 12. 回到顶部 ---------- */.back-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 990;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--denim-700); color: var(--paper-100);
  border: 2px solid var(--denim-500);
  box-shadow: 0 6px 18px rgba(34,56,79,.35);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s, background .3s;
}
.back-top svg { width: 20px; height: 20px; }
.back-top:hover { background: var(--brown-800); border-color: var(--brown-600); }
.back-top.is-visible { opacity: 1; visibility: visible; transform: none; }

/* ---------- 12. 兼容与细节 ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* 图片统一圆角与边框（牛仔风格底边） */
.pic-frame {
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  background: var(--white);
  padding: 6px;
}
.pic-frame img { border-radius: 6px; }