@charset "utf-8";
/* ==========================================================
   云久涂料企业官网 · 响应式样式
   断点：1200 / 992 / 768 / 576
   ========================================================== */

:root{
  --primary:#1e6fd9;
  --primary-dark:#1558b0;
  --primary-light:#e8f1fd;
  --accent:#ff7a18;
  --accent-dark:#e85d04;
  --text:#1f2937;
  --text-2:#4b5563;
  --text-3:#6b7280;
  --line:#e5e7eb;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --radius:10px;
  --shadow:0 2px 12px rgba(16,42,84,.06);
  --shadow-lg:0 10px 34px rgba(16,42,84,.12);
  --wrap:1200px;
  --header-h:72px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.75;color:var(--text);background:var(--bg);
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block;border:0}
a{color:inherit;text-decoration:none;transition:color .2s,background .2s,border-color .2s}
a:hover{color:var(--primary)}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,h6{margin:0 0 .6em;line-height:1.35;font-weight:700;color:#111827}
h1{font-size:30px}
h2{font-size:26px}
h3{font-size:19px}
p{margin:0 0 1em}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:15px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 16px}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:8px;top:8px;z-index:999;background:#fff;padding:8px 14px;border-radius:6px;box-shadow:var(--shadow)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:6px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1.4;cursor:pointer;transition:.22s;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 18px rgba(30,111,217,.28)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-dark);color:#fff}
.btn-outline{border-color:var(--primary);color:var(--primary);background:#fff}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{background:#f1f6ff;color:var(--primary-dark)}
.btn-outline-light{border-color:rgba(255,255,255,.75);color:#fff}
.btn-outline-light:hover{background:#fff;color:var(--primary)}
.btn-sm{padding:7px 16px;font-size:14px}
.btn-lg{padding:14px 32px;font-size:16px}

/* ---------- 顶部条 ---------- */
.topbar{background:#0f2748;color:#c8d6ea;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:36px;gap:12px}
.topbar a{color:#c8d6ea}
.topbar a:hover{color:#fff}
.tb-sep{margin:0 8px;opacity:.45}
.tb-phone{color:var(--accent);font-size:14px;letter-spacing:.5px}
.topbar-right{display:flex;align-items:center}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;background:rgba(255,255,255,.97);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line);
  transition:box-shadow .25s;
}
.site-header.stuck{box-shadow:0 4px 18px rgba(16,42,84,.08)}
.header-inner{display:flex;align-items:center;gap:24px;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo img{width:auto;max-height:46px}
.logo-mark{display:flex;align-items:center}
.logo-text strong{display:block;font-size:20px;color:var(--primary-dark);letter-spacing:1px;line-height:1.2}
.logo-text em{display:block;font-style:normal;font-size:11px;color:var(--text-3);letter-spacing:2px}

.main-nav{margin-left:auto}
.main-nav>ul{display:flex;align-items:center;gap:2px}
.nav-item{position:relative}
.nav-item>a{
  display:block;padding:0 15px;height:var(--header-h);line-height:var(--header-h);
  font-size:16px;font-weight:500;color:var(--text);position:relative;white-space:nowrap;
}
.nav-item>a::after{
  content:"";position:absolute;left:15px;right:15px;bottom:16px;height:2px;
  background:var(--primary);transform:scaleX(0);transition:transform .25s;transform-origin:center;
}
.nav-item:hover>a,.nav-item.active>a{color:var(--primary)}
.nav-item:hover>a::after,.nav-item.active>a::after{transform:scaleX(1)}
.sub-nav{
  position:absolute;top:100%;left:0;min-width:170px;background:#fff;
  border:1px solid var(--line);border-top:2px solid var(--primary);
  box-shadow:var(--shadow-lg);border-radius:0 0 8px 8px;
  opacity:0;visibility:hidden;transform:translateY(8px);transition:.22s;z-index:20;
}
.nav-item.has-sub:hover .sub-nav{opacity:1;visibility:visible;transform:translateY(0)}
.sub-nav a{display:block;padding:10px 16px;font-size:14px;color:var(--text-2);border-bottom:1px solid #f3f4f6}
.sub-nav li:last-child a{border-bottom:0}
.sub-nav a:hover{background:var(--primary-light);color:var(--primary);padding-left:20px}

.header-tools{display:flex;align-items:center;gap:12px}
.header-search{display:flex;align-items:center;border:1px solid var(--line);border-radius:20px;overflow:hidden;background:var(--bg-soft)}
.header-search input{border:0;background:transparent;padding:7px 12px;width:150px;outline:none;font-size:14px}
.header-search button{border:0;background:transparent;padding:6px 12px;color:var(--text-3);display:flex}
.header-search button:hover{color:var(--primary)}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;padding:8px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text);transition:.25s;border-radius:2px}
.nav-close{display:none}

/* ---------- 通用区块 ---------- */
.section{padding:56px 0}
.section-soft{background:var(--bg-soft)}
.sec-head{text-align:center;margin-bottom:36px}
.sec-head h2{font-size:30px;position:relative;padding-bottom:14px}
.sec-head h2::after{
  content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);
  width:52px;height:3px;background:var(--primary);border-radius:2px;
}
.sec-head p{color:var(--text-3);margin-top:10px;font-size:15px}
.sec-head .sub-en{display:block;font-size:12px;letter-spacing:3px;color:#b6c0cd;text-transform:uppercase;margin-bottom:6px}

/* ---------- Banner ---------- */
.hero{position:relative;background:linear-gradient(120deg,#0d2d5c 0%,#16529c 55%,#1e6fd9 100%);color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400'><circle cx='60' cy='300' r='180' fill='rgba(255,255,255,.04)'/><circle cx='360' cy='90' r='140' fill='rgba(255,255,255,.05)'/></svg>")}
.hero-slide{position:relative;z-index:2}
.hero-item{
  display:none;min-height:460px;align-items:center;
  padding:70px 0;
}
.hero-item.active{display:flex;animation:fadeUp .6s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.hero-content{max-width:620px}
.hero-tag{
  display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  padding:5px 14px;border-radius:20px;font-size:13px;margin-bottom:18px;letter-spacing:1px;
}
.hero h1{font-size:44px;line-height:1.25;color:#fff;margin-bottom:16px;text-shadow:0 2px 12px rgba(0,0,0,.15)}
.hero h1 em{font-style:normal;color:#ffd08a}
.hero p{font-size:17px;color:rgba(255,255,255,.88);margin-bottom:26px;max-width:560px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:36px;margin-top:38px;flex-wrap:wrap}
.hero-stat b{display:block;font-size:30px;color:#ffd08a;line-height:1.2}
.hero-stat span{font-size:13px;color:rgba(255,255,255,.75)}
.hero-dots{position:absolute;left:0;right:0;bottom:22px;z-index:5;display:flex;justify-content:center;gap:10px}
.hero-dots button{width:28px;height:4px;border:0;border-radius:2px;background:rgba(255,255,255,.35);padding:0}
.hero-dots button.active{background:#ffd08a;width:42px}

/* ---------- 优势 ---------- */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;transition:.25s}
.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:#cfe0f8}
.feature .fi{width:56px;height:56px;margin:0 auto 14px;border-radius:14px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;color:var(--primary)}
.feature h3{font-size:17px;margin-bottom:6px}
.feature p{color:var(--text-3);font-size:14px;margin:0}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:22px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:.25s;display:flex;flex-direction:column;height:100%;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#cfe0f8}
.card-media{position:relative;padding-top:66%;overflow:hidden;background:var(--bg-soft)}
.card-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card:hover .card-media img{transform:scale(1.06)}
.card-body{padding:16px 18px 20px;flex:1;display:flex;flex-direction:column}
.card-title{font-size:16px;font-weight:600;line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-title a{color:var(--text)}
.card:hover .card-title a{color:var(--primary)}
.card-desc{color:var(--text-3);font-size:14px;line-height:1.7;margin:0 0 12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.card-meta{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:#9aa3af;border-top:1px dashed var(--line);padding-top:11px}
.card-more{color:var(--primary);font-weight:500}

/* 案例卡片（覆盖式标题） */
.card-case .card-media{padding-top:72%}
.case-overlay{
  position:absolute;left:0;right:0;bottom:0;padding:34px 18px 14px;
  background:linear-gradient(transparent,rgba(9,25,49,.88));color:#fff;
}
.case-overlay h3{color:#fff;font-size:16px;margin:0}
.case-overlay span{font-size:12px;color:rgba(255,255,255,.75)}

/* 新闻列表行 */
.news-item{display:flex;gap:18px;padding:20px 0;border-bottom:1px dashed var(--line);align-items:flex-start}
.news-item:last-child{border-bottom:0}
.news-date{
  flex-shrink:0;width:64px;text-align:center;background:var(--bg-soft);border-radius:8px;
  padding:8px 0;border:1px solid var(--line);
}
.news-date b{display:block;font-size:24px;color:var(--primary);line-height:1.1}
.news-date span{font-size:12px;color:var(--text-3)}
.news-body h3{font-size:17px;margin-bottom:6px}
.news-body h3 a:hover{color:var(--primary)}
.news-body p{color:var(--text-3);font-size:14px;margin:0 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-tags{font-size:12px;color:#9aa3af}

/* 首页两栏：关于 + 新闻 */
.home-split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.about-box h2{font-size:26px}
.about-box .lead{color:var(--text-2);line-height:1.9}
.about-list{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0 22px}
.about-list li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-2)}
.about-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0}
.about-figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}

/* ---------- 面包屑 ---------- */
.page-banner{
  background:linear-gradient(120deg,#14417f,#1e6fd9);color:#fff;padding:36px 0 30px;position:relative;overflow:hidden;
}
.page-banner::after{content:"";position:absolute;right:-60px;top:-40px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.06)}
.page-banner h1{color:#fff;font-size:28px;margin:0 0 8px}
.breadcrumb{position:relative;z-index:2;font-size:13px;color:rgba(255,255,255,.82)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.breadcrumb a{color:rgba(255,255,255,.85)}
.breadcrumb a:hover{color:#ffd08a}
.breadcrumb .sep{margin:0 2px;opacity:.6}

/* 内页面包屑（浅色） */
.breadcrumb-light{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:12px 0;font-size:13px}
.breadcrumb-light ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px;color:var(--text-3)}
.breadcrumb-light a{color:var(--text-3)}
.breadcrumb-light a:hover{color:var(--primary)}
.breadcrumb-light .sep{margin:0 2px;opacity:.5}
.breadcrumb-light [aria-current]{color:var(--primary)}
/* 浅色容器内的面包屑（详情页）需要深色文字 */
.breadcrumb-light .breadcrumb{color:var(--text-3)}
.breadcrumb-light .breadcrumb a{color:var(--text-3)}
.breadcrumb-light .breadcrumb a:hover{color:var(--primary)}
.breadcrumb-light .breadcrumb [aria-current]{color:var(--primary)}
.breadcrumb-light .breadcrumb .sep{opacity:.5}

/* ---------- 内容区 ---------- */
.content-area{padding:40px 0 56px}
.layout-side{display:grid;grid-template-columns:260px 1fr;gap:36px;align-items:start}
.sidebar{position:sticky;top:calc(var(--header-h) + 16px)}
.side-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:20px;overflow:hidden}
.side-box h3{font-size:16px;padding:14px 18px;margin:0;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.side-cat a{display:flex;justify-content:space-between;padding:11px 18px;font-size:14px;color:var(--text-2);border-bottom:1px solid #f3f4f6}
.side-cat li:last-child a{border-bottom:0}
.side-cat a:hover,.side-cat a.active{background:var(--primary);color:#fff;padding-left:22px}
.side-cat .cnt{font-size:12px;opacity:.7}
.side-news{padding:6px 0}
.side-news a{display:block;padding:9px 18px;font-size:14px;color:var(--text-2);line-height:1.6}
.side-news a:hover{color:var(--primary)}
.side-contact{padding:18px;font-size:14px;color:var(--text-2)}
.side-contact p{margin:0 0 8px}
.side-contact .big-phone{font-size:22px;color:var(--accent);font-weight:700;display:block;margin:6px 0}

/* 文章正文 */
.article-head{text-align:center;margin-bottom:28px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.article-head h1{font-size:30px;margin-bottom:12px}
.article-meta{font-size:13px;color:var(--text-3);display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.article-content{font-size:16px;line-height:1.95;color:#2b3442}
.article-content p{margin:0 0 1.2em}
.article-content h2{font-size:22px;margin:1.6em 0 .8em;padding-left:12px;border-left:4px solid var(--primary)}
.article-content h3{font-size:18px;margin:1.4em 0 .7em}
.article-content img{border-radius:8px;margin:16px auto;max-width:100%}
.article-content ul,.article-content ol{margin:0 0 1.2em;padding-left:1.4em}
.article-content ul li{list-style:disc;margin-bottom:.4em}
.article-content ol li{list-style:decimal;margin-bottom:.4em}
.article-content blockquote{margin:16px 0;padding:14px 18px;background:var(--bg-soft);border-left:4px solid var(--primary);border-radius:0 8px 8px 0;color:var(--text-2)}
.article-content table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15px}
.article-content th,.article-content td{border:1px solid var(--line);padding:10px 12px}
.article-content th{background:var(--bg-soft);font-weight:600}
.article-content a{color:var(--primary);text-decoration:underline}

.article-tags{margin:26px 0;font-size:13px;color:var(--text-3)}
.article-tags a{display:inline-block;background:var(--bg-soft);padding:4px 12px;border-radius:14px;margin:0 6px 6px 0;color:var(--text-2)}
.article-tags a:hover{background:var(--primary);color:#fff}
.article-nav{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding-top:18px;margin-top:24px;font-size:14px;flex-wrap:wrap}
.article-nav a{color:var(--text-2)}
.article-nav a:hover{color:var(--primary)}

/* 产品详情 */
.detail-layout{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.detail-gallery{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg-soft)}
.detail-gallery img{width:100%}
.detail-info h1{font-size:28px}
.detail-price-box{background:var(--bg-soft);border-radius:var(--radius);padding:18px;margin:18px 0}
.detail-attr{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;font-size:14px;margin-bottom:20px}
.detail-attr div{display:flex;gap:8px}
.detail-attr span{color:var(--text-3);flex-shrink:0;min-width:56px}
.detail-tabs{margin-top:44px}
.tab-nav{display:flex;gap:4px;border-bottom:2px solid var(--line);flex-wrap:wrap}
.tab-nav button{border:0;background:none;padding:12px 24px;font-size:16px;font-weight:600;color:var(--text-3);border-bottom:2px solid transparent;margin-bottom:-2px}
.tab-nav button.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-panel{display:none;padding:26px 0}
.tab-panel.active{display:block}

/* ---------- 分页 ---------- */
.pagination{margin:34px 0;display:flex;justify-content:center}
.pagination ul{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.page-link{display:block;min-width:38px;text-align:center;padding:7px 12px;border:1px solid var(--line);border-radius:6px;color:var(--text-2);background:#fff;font-size:14px}
.page-link:hover{border-color:var(--primary);color:var(--primary)}
.page-link.current{background:var(--primary);border-color:var(--primary);color:#fff}
.page-ellipsis{padding:7px 4px;color:var(--text-3)}

/* ---------- CTA ---------- */
.cta-band{background:linear-gradient(100deg,var(--accent),#ff9a4d);color:#fff;padding:34px 0}
.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta-text h2{color:#fff;font-size:24px;margin-bottom:4px}
.cta-text p{margin:0;color:rgba(255,255,255,.9)}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{background:#0f2748;color:#a9bcd6;padding:48px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:32px;padding-bottom:32px}
.footer-col h3{color:#fff;font-size:16px;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h3::after{content:"";position:absolute;left:0;bottom:0;width:30px;height:2px;background:var(--accent)}
.footer-about p{color:#a9bcd6;line-height:1.8}
.footer-links li{margin-bottom:9px}
.footer-links a{color:#a9bcd6}
.footer-links a:hover{color:#fff;padding-left:4px}
.contact-list li{margin-bottom:10px;display:flex;gap:10px;align-items:flex-start}
.contact-list .ci{
  flex-shrink:0;background:rgba(255,255,255,.1);border-radius:4px;
  padding:0 7px;font-size:12px;color:#cfe0f7;line-height:22px;
}
.qr{margin-top:12px;border-radius:8px;border:3px solid #fff;width:96px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 0}
.fb-inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:#8ba0be}
.fb-inner p{margin:0}
.fb-links a{color:#8ba0be}
.fb-links a:hover{color:#fff}

/* ---------- 移动端底部条 + 返回顶部 ---------- */
.mobile-bar{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:90;background:#fff;
  border-top:1px solid var(--line);box-shadow:0 -2px 12px rgba(0,0,0,.06);
}
.mobile-bar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 0;color:var(--text-3);font-size:11px}
.mobile-bar a:active,.mobile-bar a:hover{color:var(--primary)}
.back-top{
  position:fixed;right:18px;bottom:78px;width:42px;height:42px;border-radius:50%;
  border:1px solid var(--line);background:#fff;color:var(--primary);
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transition:.25s;z-index:70;
}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--primary);color:#fff}

/* ---------- 表单 ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-item{margin-bottom:4px}
.form-item.full{grid-column:1/-1}
.form-item label{display:block;font-size:14px;margin-bottom:6px;color:var(--text-2)}
.form-item input,.form-item select,.form-item textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;outline:none;transition:.2s;background:#fff;
}
.form-item input:focus,.form-item textarea:focus,.form-item select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(30,111,217,.1)}
.form-item textarea{min-height:120px;resize:vertical}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info li{display:flex;gap:12px;padding:14px 0;border-bottom:1px dashed var(--line)}
.contact-info .ci{width:38px;height:38px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-info b{display:block;font-size:14px}
.contact-info span{font-size:14px;color:var(--text-2)}

/* ---------- 空状态 / 提示 ---------- */
.empty{padding:60px 20px;text-align:center;color:var(--text-3)}
.empty-ico{font-size:48px;opacity:.25}
.alert{padding:12px 16px;border-radius:6px;margin-bottom:16px;font-size:14px}
.alert-success{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}
.alert-error{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}

/* ---------- 响应式：平板 ---------- */
@media (max-width:1200px){
  :root{--wrap:100%}
  .features{gap:16px}
  .grid-4{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:992px){
  .features{grid-template-columns:repeat(2,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .home-split{grid-template-columns:1fr;gap:28px}
  .layout-side{grid-template-columns:1fr}
  .sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:16px}
  .side-box{margin-bottom:0}
  .detail-layout{grid-template-columns:1fr;gap:26px}
  .contact-grid{grid-template-columns:1fr;gap:26px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
  .hero h1{font-size:34px}
  .hero-item{min-height:380px;padding:52px 0}
}

/* ---------- 响应式：手机 ---------- */
@media (max-width:768px){
  body{font-size:14.5px}
  .topbar{display:none}
  :root{--header-h:58px}
  /* 关键修复：backdrop-filter 会让 .site-header 成为 position:fixed 子元素的包含块，
     使抽屉菜单 .main-nav 的 top:0/bottom:0 相对 header（仅 58px 高）计算，
     菜单被压成一条。移动端必须关闭该属性，否则抽屉打不开。
     header 背景本身是 97% 不透明，关闭后视觉几乎无差异。 */
  .site-header{backdrop-filter:none;-webkit-backdrop-filter:none}
  .header-inner{height:58px;gap:10px}
  .logo-text strong{font-size:17px}
  .logo-text em{display:none}
  .header-search{display:none}
  .menu-toggle{display:flex}

  .main-nav{
    position:fixed;top:0;right:0;bottom:0;width:78%;max-width:320px;background:#fff;
    box-shadow:-4px 0 24px rgba(16,42,84,.16);z-index:200;
    transform:translateX(100%);transition:transform .28s ease;overflow-y:auto;
    margin:0;padding:60px 0 30px;
  }
  .main-nav.open{transform:translateX(0)}
  .main-nav>ul{display:block}
  .nav-item>a{height:auto;line-height:1.5;padding:14px 22px;border-bottom:1px solid #f1f3f5;font-size:16px}
  .nav-item>a::after{display:none}
  .nav-item.active>a{background:var(--primary-light);color:var(--primary);border-left:3px solid var(--primary)}
  .sub-nav{
    position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;
    border-top:0;background:var(--bg-soft);display:none;
  }
  .nav-item.has-sub.open .sub-nav{display:block}
  .sub-nav a{padding:10px 22px 10px 34px;font-size:14px}
  .sub-nav a:hover{padding-left:34px}
  .nav-close{display:block;position:absolute;right:14px;top:12px;border:0;background:none;font-size:30px;line-height:1;color:var(--text-3);width:40px;height:40px}
  .nav-mobile-extra{padding:20px 22px}
  .nav-mobile-extra .btn{width:100%}
  .nav-backdrop{
    position:fixed;inset:0;background:rgba(9,25,49,.45);z-index:190;
  }

  .hero-item{min-height:auto;padding:44px 0 56px}
  .hero h1{font-size:26px}
  .hero p{font-size:15px}
  .hero-stats{gap:22px;margin-top:24px}
  .hero-stat b{font-size:24px}
  .hero-btns .btn{flex:1;min-width:140px}

  .section{padding:36px 0}
  .sec-head{margin-bottom:24px}
  .sec-head h2{font-size:23px}

  .features{grid-template-columns:1fr 1fr;gap:12px}
  .feature{padding:18px 12px}
  .feature .fi{width:44px;height:44px}
  .feature h3{font-size:15px}
  .feature p{font-size:13px}

  .grid{gap:14px}
  .grid-4,.grid-3,.grid-2{grid-template-columns:repeat(2,1fr)}
  .card-title{font-size:15px}
  .card-desc{font-size:13px;-webkit-line-clamp:2}
  .card-body{padding:12px 13px 15px}

  .news-item{gap:12px;padding:15px 0}
  .news-date{width:54px;padding:6px 0}
  .news-date b{font-size:20px}
  .news-body h3{font-size:15px}
  .news-body p{font-size:13px}

  .page-banner{padding:24px 0 20px}
  .page-banner h1{font-size:21px}
  .content-area{padding:24px 0 36px}
  .article-head h1{font-size:22px}
  .article-content{font-size:15.5px;line-height:1.9}
  .detail-info h1{font-size:22px}
  .detail-attr{grid-template-columns:1fr}
  .tab-nav button{padding:10px 14px;font-size:15px}

  .sidebar{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .cta-band{padding:24px 0}
  .cta-text h2{font-size:20px}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1}

  .site-footer{padding:32px 0 0}
  .footer-grid{grid-template-columns:1fr;gap:22px;padding-bottom:20px}
  .footer-bottom{padding-bottom:64px}

  .mobile-bar{display:flex}
  .back-top{bottom:66px;right:12px;width:38px;height:38px}
  body{padding-bottom:56px}
}

@media (max-width:576px){
  .grid-4,.grid-3,.grid-2{grid-template-columns:repeat(2,1fr)}
  .features{grid-template-columns:1fr 1fr}
  .sec-head h2{font-size:20px}
  .hero h1{font-size:23px}
  .pagination .page-link{min-width:34px;padding:6px 9px;font-size:13px}
  .article-meta{gap:10px;font-size:12px}
  .about-list{grid-template-columns:1fr}
}

@media (max-width:400px){
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
}

/* 打印 */
@media print{
  .topbar,.site-header,.mobile-bar,.back-top,.cta-band,.site-footer{display:none}
}

/* 减少动画偏好 */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}