/* ============ 中研供应链 · 功能平台样式（希赛风格） ============ */
:root{
  --c-primary:#1d5ef0; --c-primary-d:#1446c4; --c-accent:#ff5a1f; --c-red:#e63329;
  --c-dark:#1b2330; --c-text:#333f52; --c-muted:#7c8798; --c-line:#e7ecf3;
  --c-bg:#f5f7fb; --c-card:#fff; --radius:12px; --shadow:0 6px 24px rgba(27,35,48,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--c-text);background:#fff;font-size:14px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px;outline:none}
.container{max-width:1200px;margin:0 auto;padding:0 16px}

/* ---------- 工具按钮 ---------- */
.btn{display:inline-block;padding:9px 20px;border-radius:8px;font-size:14px;border:1px solid transparent;text-align:center;transition:all .2s}
.btn-gold{background:linear-gradient(135deg,#ffb347,#ff8c1a);color:#fff;font-weight:600}
.btn-gold:hover{opacity:.9;transform:translateY(-1px)}
.btn-red{background:var(--c-red);color:#fff;font-weight:600}
.btn-red:hover{opacity:.9;transform:translateY(-1px)}
.btn-blue{background:var(--c-primary);color:#fff}
.btn-blue:hover{opacity:.9}
.btn-ghost{background:#fff;color:var(--c-primary);border-color:var(--c-primary)}
.btn-ghost:hover{background:var(--c-primary);color:#fff}
.btn-sm{padding:6px 14px;font-size:13px}
.btn-block{width:100%;display:block}
.btn-lg{padding:12px 30px;font-size:16px}

/* ---------- 顶栏 ---------- */
.topbar{background:#0f172a;color:#c7d2e0;font-size:12px}
.topbar-in{display:flex;justify-content:space-between;align-items:center;height:34px}
.tb-left .dot{color:#4ade80;font-style:normal;margin-right:4px}
.tb-right a{color:#c7d2e0;margin-left:16px}
.tb-right a:hover{color:#fff}
.tb-right .tb-warn{color:#ffd166}

/* ---------- 头部 ---------- */
.site-header{background:#fff;border-bottom:1px solid var(--c-line)}
.header-in{display:flex;align-items:center;gap:24px;height:78px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#1d5ef0,#1446c4);color:#fff;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(29,94,240,.35)}
.brand-logo.sm{width:38px;height:38px;font-size:18px}
.brand-logo.two{width:auto;min-width:44px;padding:0 9px;font-size:16px;letter-spacing:2px}
.brand-logo.sm.two{width:auto;min-width:38px;padding:0 7px;font-size:13px;letter-spacing:1px}
.brand-text b{font-size:20px;color:var(--c-dark);display:block;line-height:1.2}
.brand-text i{font-size:12px;color:var(--c-muted);font-style:normal}
.header-search{flex:1;max-width:420px}
.header-search form{display:flex;border:2px solid var(--c-primary);border-radius:22px;overflow:hidden;background:#fff}
.header-search input{flex:1;border:none;padding:9px 16px;font-size:14px}
.header-search button{background:var(--c-primary);color:#fff;border:none;padding:0 22px;font-size:14px}
.header-contact{display:flex;align-items:center;gap:8px;flex-shrink:0}
.hc-icon{width:38px;height:38px;border-radius:50%;background:#fff4ec;color:var(--c-accent);font-size:18px;display:flex;align-items:center;justify-content:center}
.hc-text span{font-size:11px;color:var(--c-muted);display:block}
.hc-text a{font-size:17px;font-weight:700;color:var(--c-accent)}
.header-enroll{margin-left:auto}

/* ---------- 导航 ---------- */
.main-nav{background:var(--c-primary);box-shadow:0 3px 10px rgba(29,94,240,.2);position:relative;z-index:50}
.nav-in{position:relative}
.nav-list{display:flex;align-items:center}
.nav-list>li{position:relative}
.nav-list>li>a{display:block;color:#fff;padding:0 17px;height:52px;line-height:52px;font-size:15px;font-weight:500}
.nav-list>li:hover>a,.nav-list>li.on>a{background:var(--c-primary-d);color:#fff}
.caret{display:inline-block;border:5px solid transparent;border-top-color:#fff;margin-left:5px;vertical-align:middle}
.has-sub:hover .sub-nav{display:block}
.sub-nav{display:none;position:absolute;left:0;top:52px;min-width:230px;background:#fff;border-radius:0 0 10px 10px;box-shadow:0 14px 30px rgba(27,35,48,.18);padding:8px 0;z-index:60}
.sub-nav a{display:block;padding:10px 20px;color:var(--c-text);font-size:14px}
.sub-nav a:hover{color:var(--c-primary);background:#f0f5ff}
.nav-fill{height:0}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:8px;margin-left:auto}
.nav-toggle span{width:24px;height:2px;background:var(--c-dark);border-radius:2px;transition:.3s}
.nav-toggle.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.on span:nth-child(2){opacity:0}
.nav-toggle.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 区块标题 ---------- */
.section{padding:44px 0}
.section.alt{background:var(--c-bg)}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px}
.sec-title{font-size:24px;color:var(--c-dark);font-weight:700;position:relative;padding-left:14px}
.sec-title::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:linear-gradient(180deg,var(--c-primary),var(--c-accent))}
.sec-title small{font-size:14px;color:var(--c-muted);font-weight:400;margin-left:10px}
.sec-more{color:var(--c-primary);font-size:13px}
.sec-more:hover{text-decoration:underline}

/* ---------- 首页 Hero ---------- */
.hero{background:linear-gradient(135deg,#12224a 0%,#1d5ef0 55%,#3b82f6 100%);color:#fff;padding:56px 0 64px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:380px;height:380px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero-in{position:relative;z-index:2;text-align:center}
.hero-title{font-size:38px;font-weight:800;letter-spacing:1px}
.hero-title em{font-style:normal;color:#ffd166}
.hero-sub{margin-top:14px;font-size:16px;color:rgba(255,255,255,.85)}
.hero-search{max-width:640px;margin:28px auto 0;display:flex;border-radius:30px;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.hero-search input{flex:1;border:none;padding:15px 22px;font-size:15px}
.hero-search button{background:var(--c-accent);color:#fff;border:none;padding:0 34px;font-size:15px;font-weight:600}
.hero-hot{margin-top:22px;font-size:13px;color:rgba(255,255,255,.85)}
.hero-hot a{display:inline-block;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);border-radius:16px;padding:3px 14px;margin:6px 5px 0}
.hero-hot a:hover{background:#fff;color:var(--c-primary)}
.hero-stats{display:flex;justify-content:center;gap:70px;margin-top:36px}
.hs-item b{font-size:28px;display:block;color:#ffd166}
.hs-item span{font-size:13px;color:rgba(255,255,255,.85)}

/* ---------- 认证项目 ---------- */
.project-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.project-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:22px 18px;transition:.25s;position:relative;overflow:hidden}
.project-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.pc-ico{width:72px;height:72px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;color:#fff;margin-bottom:14px;line-height:1.2;text-align:center;padding:4px;box-sizing:border-box}
.pc-ico.t1{background:#c8102e}.pc-ico.t2{background:#0e7a4e}.pc-ico.t3{background:#1a6fb5}
.pc-ico.t4{background:#7b5cd6}.pc-ico.t5{background:#d97706}.pc-ico.t6{background:#b91c1c}.pc-ico.t7{background:#0f766e}
.pc-name{font-size:17px;font-weight:700;color:var(--c-dark)}
.pc-org{font-size:12px;color:var(--c-muted);margin:4px 0 10px;min-height:34px}
.pc-tags span{display:inline-block;background:#f0f5ff;color:var(--c-primary);font-size:11px;border-radius:4px;padding:1px 8px;margin:0 4px 4px 0}
.pc-more{display:inline-block;margin-top:8px;color:var(--c-primary);font-size:13px}
.pc-more:hover{text-decoration:underline}

/* ---------- 视频课程卡片 ---------- */
.course-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.course-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.cc-cover{height:130px;position:relative;display:flex;align-items:center;justify-content:center;color:#fff;font-size:30px;font-weight:800;overflow:hidden}
.cc-cover::before{content:"";position:absolute;inset:0;background:rgba(0,0,0,.18)}
.cc-tag{position:absolute;top:10px;left:10px;z-index:2;background:rgba(0,0,0,.45);color:#fff;font-size:11px;padding:2px 10px;border-radius:4px}
.cc-play{position:relative;z-index:2;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.25);border:2px solid rgba(255,255,255,.8);display:flex;align-items:center;justify-content:center;font-size:16px}
.cover-cppm{background:linear-gradient(135deg,#e11d48,#7f1d1d)}
.cover-scmp{background:linear-gradient(135deg,#16a34a,#14532d)}
.cover-cpps{background:linear-gradient(135deg,#2563eb,#1e3a8a)}
.cover-pmp{background:linear-gradient(135deg,#8b5cf6,#4c1d95)}
.cover-sixsigma{background:linear-gradient(135deg,#f59e0b,#92400e)}
.cover-economist{background:linear-gradient(135deg,#dc2626,#7f1d1d)}
.cover-ccaa{background:linear-gradient(135deg,#14b8a6,#134e4a)}
.cc-body{padding:14px 16px;flex:1;display:flex;flex-direction:column}
.cc-title{font-size:15px;font-weight:600;color:var(--c-dark);line-height:1.45;min-height:44px}
.cc-meta{font-size:12px;color:var(--c-muted);margin:8px 0 4px}
.cc-meta span{margin-right:12px}
.cc-teacher{font-size:13px;color:var(--c-text)}
.cc-foot{display:flex;gap:8px;margin-top:12px}
.cc-foot .btn{flex:1;padding:7px 8px;font-size:13px}
.price-tag{position:absolute;right:10px;bottom:10px;z-index:2;background:var(--c-accent);color:#fff;font-size:12px;padding:2px 10px;border-radius:4px}

/* ---------- 学习功能入口 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.feature-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:26px 18px;text-align:center;transition:.25s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--c-primary)}
.fc-ico{width:60px;height:60px;border-radius:50%;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;font-size:26px;color:#fff}
.fc-ico.i1{background:linear-gradient(135deg,#1d5ef0,#60a5fa)}
.fc-ico.i2{background:linear-gradient(135deg,#ff5a1f,#fbbf24)}
.fc-ico.i3{background:linear-gradient(135deg,#16a34a,#4ade80)}
.fc-ico.i4{background:linear-gradient(135deg,#8b5cf6,#c4b5fd)}
.fc-name{font-size:16px;font-weight:700;color:var(--c-dark)}
.fc-desc{font-size:12px;color:var(--c-muted);margin-top:6px}

/* ---------- 新闻列表 ---------- */
.news-list{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:6px 22px}
.news-item{display:flex;align-items:center;gap:14px;padding:15px 0;border-bottom:1px dashed var(--c-line)}
.news-item:last-child{border-bottom:none}
.ni-date{background:#f0f5ff;color:var(--c-primary);border-radius:8px;text-align:center;padding:6px 10px;flex-shrink:0}
.ni-date b{display:block;font-size:18px;line-height:1.1}
.ni-date span{font-size:11px}
.ni-title{flex:1;font-size:15px;color:var(--c-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ni-title:hover{color:var(--c-primary)}
.ni-cat{font-size:12px;color:var(--c-muted);flex-shrink:0}

/* ---------- 内页横幅 ---------- */
.page-banner{background:linear-gradient(135deg,#12224a,#1d5ef0);color:#fff;padding:34px 0}
.pb-in{display:flex;align-items:center;justify-content:space-between}
.pb-title{font-size:26px;font-weight:700}
.pb-title em{font-style:normal;color:#ffd166}
.crumb{font-size:13px;color:rgba(255,255,255,.8)}
.crumb a{color:rgba(255,255,255,.8)}
.crumb a:hover{color:#fff}

/* ---------- 通用两栏 ---------- */
.two-col{display:grid;grid-template-columns:1fr 300px;gap:22px;padding:26px 0}
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:24px}
.card-title{font-size:16px;font-weight:700;color:var(--c-dark);margin-bottom:14px;padding-left:12px;border-left:4px solid var(--c-primary)}
.side-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:18px;margin-bottom:18px}
.qa-list a{display:block;font-size:13px;color:var(--c-text);padding:7px 0;border-bottom:1px dashed var(--c-line)}
.qa-list a:last-child{border-bottom:none}
.qa-list a:hover{color:var(--c-primary)}
.qa-list a b{color:var(--c-primary)}

/* ---------- 文章 ---------- */
.article h1{font-size:24px;color:var(--c-dark);margin-bottom:8px}
.article h2{font-size:19px;color:var(--c-dark);margin:22px 0 10px;padding-left:12px;border-left:4px solid var(--c-primary)}
.article h3{font-size:16px;color:var(--c-dark);margin:16px 0 8px}
.article p{margin:10px 0;font-size:15px}
.article ul,.article ol{margin:10px 0;padding-left:22px}
.article ul{list-style:disc}
.article ol{list-style:decimal}
.article table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.article th,.article td{border:1px solid var(--c-line);padding:9px 12px;text-align:left}
.article th{background:#f0f5ff;color:var(--c-dark);font-weight:600}
.article .meta{color:var(--c-muted);font-size:13px;margin-bottom:14px}
.article .tip{background:#fff8e6;border:1px solid #ffe1a8;color:#7a5b00;border-radius:8px;padding:12px 16px;margin:14px 0}
.article .highlight{background:#eef4ff;border:1px solid #c9dcff;color:#1446c4;border-radius:8px;padding:12px 16px;margin:14px 0}

/* ---------- 表单 ---------- */
.f-row{margin-bottom:14px}
.f-row label{display:block;font-size:13px;color:var(--c-text);margin-bottom:6px;font-weight:600}
.f-row input,.f-row select,.f-row textarea{width:100%;border:1px solid #d5dce6;border-radius:8px;padding:10px 12px;background:#fff;transition:border .2s}
.f-row input:focus,.f-row select:focus,.f-row textarea:focus{border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(29,94,240,.12)}
.form-msg{margin:10px 0;font-size:13px;display:none}
.form-msg.show{display:block}
.form-msg.err{color:#d92d20}
.form-msg.ok{color:#0e7a4e}
.form-tip{font-size:12px;color:var(--c-muted);margin-top:10px}

/* ---------- 弹窗 ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.55);z-index:999;display:flex;align-items:center;justify-content:center;padding:16px}
.modal-box{background:#fff;border-radius:16px;max-width:420px;width:100%;padding:28px;position:relative;animation:pop .25s}
@keyframes pop{from{transform:scale(.92);opacity:0}to{transform:scale(1);opacity:1}}
.modal-close{position:absolute;right:14px;top:10px;font-size:28px;background:none;border:none;color:var(--c-muted);line-height:1}
.modal-title{font-size:19px;font-weight:700;color:var(--c-dark)}
.modal-sub{font-size:13px;color:var(--c-muted);margin:6px 0 16px}

/* ---------- 题库/考试通用 ---------- */
.quiz-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.quiz-tabs a{padding:9px 20px;border-radius:20px;background:#fff;border:1px solid var(--c-line);color:var(--c-text);font-size:14px}
.quiz-tabs a.on{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}
.q-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:22px 24px;margin-bottom:18px}
.q-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.q-type{font-size:12px;padding:2px 10px;border-radius:4px;color:#fff}
.q-type.single{background:#1d5ef0}.q-type.multi{background:#d97706}.q-type.judge{background:#16a34a}
.q-progress-info{font-size:13px;color:var(--c-muted);margin-left:auto}
.q-text{font-size:16px;color:var(--c-dark);line-height:1.7;margin-bottom:14px}
.q-opts{display:flex;flex-direction:column;gap:10px}
.q-opts label{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--c-line);border-radius:10px;padding:12px 16px;cursor:pointer;transition:.2s;font-size:15px}
.q-opts label:hover{border-color:var(--c-primary);background:#f7faff}
.q-opts label.on{border-color:var(--c-primary);background:#eef4ff}
.q-opts label.right{border-color:#16a34a;background:#f0fdf4}
.q-opts label.wrong{border-color:#dc2626;background:#fef2f2}
.q-opts .opt-key{font-weight:700;color:var(--c-primary)}
.q-exp{display:none;background:#f8fafc;border:1px solid var(--c-line);border-left:4px solid #16a34a;border-radius:8px;padding:14px 16px;margin-top:14px;font-size:14px}
.q-exp.show{display:block}
.q-nav{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.q-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}
.qs-card{background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:14px;text-align:center}
.qs-card b{font-size:22px;color:var(--c-primary);display:block}
.qs-card span{font-size:12px;color:var(--c-muted)}
.progress-bar{height:8px;background:#e8edf4;border-radius:4px;overflow:hidden;margin-top:12px}
.progress-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--c-primary),#60a5fa);border-radius:4px;transition:width .3s}
.empty{text-align:center;color:var(--c-muted);padding:50px 0;font-size:15px}

/* ---------- 模拟考试 ---------- */
.exam-setup{max-width:760px;margin:0 auto}
.exam-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.exam-top{display:flex;align-items:center;justify-content:space-between;background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:12px 18px;margin-bottom:16px;position:sticky;top:0;z-index:20}
.exam-timer{font-size:20px;font-weight:800;color:var(--c-red);font-variant-numeric:tabular-nums}
.exam-timer.warn{animation:blink 1s infinite}
@keyframes blink{50%{opacity:.4}}
.answer-sheet{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:8px;margin-top:12px}
.answer-sheet a{display:flex;align-items:center;justify-content:center;height:40px;border-radius:8px;background:#f1f5f9;color:var(--c-text);font-size:13px;font-weight:600;border:1px solid var(--c-line)}
.answer-sheet a.done{background:#1d5ef0;color:#fff;border-color:var(--c-primary)}
.answer-sheet a.cur{outline:2px solid var(--c-accent);outline-offset:1px}
.result-box{text-align:center;padding:30px 0}
.result-score{font-size:60px;font-weight:800;color:var(--c-primary)}
.result-score.pass{color:#16a34a}.result-score.fail{color:#dc2626}
.result-tip{font-size:15px;color:var(--c-muted);margin:8px 0 20px}
.result-list{margin-top:24px;text-align:left}
.result-item{border:1px solid var(--c-line);border-radius:10px;padding:14px 18px;margin-bottom:12px;background:#fff}
.result-item .ri-q{font-size:15px;color:var(--c-dark);margin-bottom:6px}
.result-item .ri-ans{font-size:13px}
.result-item .ri-ans .ok{color:#16a34a;font-weight:600}
.result-item .ri-ans .no{color:#dc2626;font-weight:600}
.result-item .ri-exp{font-size:13px;color:var(--c-muted);margin-top:6px;background:#f8fafc;padding:8px 12px;border-radius:6px}

/* ---------- 学习中心 ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:20px}
.stat-card{background:#fff;border:1px solid var(--c-line);border-radius:12px;padding:18px 12px;text-align:center}
.stat-card b{font-size:26px;color:var(--c-primary);display:block}
.stat-card span{font-size:12px;color:var(--c-muted)}
.learn-tabs{display:flex;gap:8px;margin-bottom:18px;border-bottom:2px solid var(--c-line)}
.learn-tabs button{background:none;border:none;padding:10px 18px;font-size:15px;color:var(--c-muted);border-bottom:2px solid transparent;margin-bottom:-2px}
.learn-tabs button.on{color:var(--c-primary);border-color:var(--c-primary);font-weight:600}
.table{width:100%;border-collapse:collapse;background:#fff}
.table th,.table td{border:1px solid var(--c-line);padding:10px 12px;font-size:13px;text-align:left}
.table th{background:#f0f5ff;color:var(--c-dark)}
.wrong-item{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:12px 16px;margin-bottom:10px}
.wrong-item .wi-q{flex:1;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.wrong-item .btn{padding:5px 12px;font-size:12px}

/* ---------- 底部 ---------- */
.site-footer{background:#0f172a;color:#9aa8bc;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:30px;padding:40px 0 26px}
.f-logo{display:flex;align-items:center;gap:10px;color:#fff;margin-bottom:14px}
.f-logo b{font-size:18px}
.fcol h4{color:#fff;font-size:15px;margin-bottom:14px}
.fcol ul li{margin-bottom:8px}
.fcol ul a:hover{color:#fff}
.f-credit span{display:block;margin-top:6px;font-size:13px}
.f-contact li{display:flex;gap:10px;margin-bottom:12px;font-size:13px}
.f-contact i{color:var(--c-accent);font-style:normal}
.footer-links{border-top:1px solid rgba(255,255,255,.1);padding:14px 0;font-size:13px}
.footer-links a{margin-right:16px}
.footer-links a:hover{color:#fff}
.fl-t{color:#64748b}
.copyright{background:#0b1120;padding:16px 0;font-size:12px;color:#64748b;text-align:center}
.copyright a{color:#94a3b8}
.backtop{position:fixed;right:22px;bottom:90px;width:42px;height:42px;border-radius:10px;background:var(--c-primary);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);z-index:90}
.mobile-bar{display:none;position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--c-line);z-index:95}
.mobile-bar a{flex:1;text-align:center;padding:9px 0;font-size:12px;color:var(--c-text)}
.mobile-bar a i{display:block;font-size:18px;font-style:normal}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .project-grid,.course-grid,.feature-grid{grid-template-columns:repeat(3,1fr)}
  .stats-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:900px){
  .header-search{display:none}
  .header-contact{display:none}
  .nav-toggle{display:flex}
  .main-nav{position:relative}
  .nav-list{display:none;flex-direction:column;background:var(--c-primary)}
  .nav-list.open{display:flex}
  .nav-list>li>a{height:44px;line-height:44px;border-top:1px solid rgba(255,255,255,.12)}
  .sub-nav{position:static;display:none;box-shadow:none;background:rgba(0,0,0,.15);min-width:0}
  .has-sub.open .sub-nav{display:block}
  .sub-nav a{color:#fff}
  .hero-title{font-size:28px}
  .hero-stats{gap:30px}
  .two-col{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .project-grid,.course-grid,.feature-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .exam-meta{grid-template-columns:1fr}
  .q-stats{grid-template-columns:repeat(2,1fr)}
  .header-in{height:64px}
  .brand-text i{display:none}
  .brand-text b{font-size:17px}
  .hero{padding:36px 0}
  .hero-title{font-size:23px}
  .hero-sub{font-size:14px}
  .hero-search button{padding:0 18px}
  .section{padding:30px 0}
  .sec-title{font-size:20px}
  .mobile-bar{display:flex}
  .backtop{bottom:64px}
  .copyright{padding-bottom:64px}
  .news-item .ni-date{display:none}
  .ni-title{white-space:normal}
}