/* ============================================================
   艾智兴创想科技 - 全站公共样式（唯一 CSS 文件）
   主色：科技蓝 / 点缀：活力橙
   ============================================================ */
:root{
  --primary:#2b6cb0;
  --primary-dark:#1e4e8c;
  --accent:#f6ad3b;
  --dark:#1a202c;
  --gray:#4a5568;
  --light:#f7fafc;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:var(--dark);line-height:1.7;background:#fff}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}

/* ===== 顶部导航 ===== */
header{position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);box-shadow:0 1px 4px rgba(0,0,0,.06);z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:20px;font-weight:800;color:var(--primary);display:flex;align-items:center;gap:8px}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:800}
.logo span.txt{color:var(--accent)}
nav ul{display:flex;gap:28px;list-style:none}
nav a{font-size:15px;color:var(--gray);padding:6px 2px;border-bottom:2px solid transparent;transition:.2s}
nav a:hover{color:var(--primary)}
nav a.active{color:var(--primary);font-weight:700;border-bottom-color:var(--accent)}
@media(max-width:720px){
  nav ul{display:none}
  /* 简单移动端菜单：横向滚动 */
  .nav{flex-wrap:wrap;height:auto;padding:10px 0}
  nav ul{display:flex;gap:16px;width:100%;overflow-x:auto}
}

/* ===== 首屏 Banner ===== */
.hero{background:linear-gradient(135deg,#1e4e8c 0%,#2b6cb0 55%,#4299e1 100%);color:#fff;text-align:center;padding:90px 20px 120px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:340px;height:340px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero::before{content:"";position:absolute;left:-60px;bottom:-120px;width:260px;height:260px;border-radius:50%;background:rgba(246,173,59,.18)}
.hero h1{font-size:clamp(28px,5vw,44px);font-weight:800;margin-bottom:14px;position:relative;z-index:1}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.sub{font-size:clamp(15px,2.4vw,18px);opacity:.92;max-width:620px;margin:0 auto 26px;position:relative;z-index:1}
.hero .tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;position:relative;z-index:1}
.hero .tags span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);padding:5px 16px;border-radius:999px;font-size:14px}
.hero .btns{margin-top:34px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative;z-index:1}
.btn{display:inline-block;padding:12px 30px;border-radius:999px;font-size:15px;font-weight:600;transition:.2s}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(246,173,59,.4)}
.btn-accent:hover{transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.7);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* ===== 通用区块 ===== */
section{padding:70px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head h2{font-size:clamp(22px,3.4vw,30px);font-weight:800}
.sec-head h2 i{font-style:normal;color:var(--accent)}
.sec-head p{color:var(--gray);margin-top:8px;font-size:15px}

/* ===== 优势（数字条）===== */
.stats{background:var(--light);padding:44px 0}
.stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stats .num{font-size:34px;font-weight:800;color:var(--primary)}
.stats .num em{font-style:normal;color:var(--accent);font-size:20px}
.stats .lbl{color:var(--gray);font-size:14px}
@media(max-width:720px){.stats .grid{grid-template-columns:repeat(2,1fr)}}

/* ===== 课程六宫格 ===== */
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.course-card{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius);padding:28px 24px;transition:.25s;position:relative;overflow:hidden}
.course-card:hover{transform:translateY(-5px);box-shadow:0 12px 28px rgba(43,108,176,.14);border-color:var(--primary)}
.course-card .icon{width:52px;height:52px;border-radius:13px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px;background:#ebf4ff}
.course-card h3{font-size:18px;margin-bottom:8px}
.course-card p{font-size:14px;color:var(--gray);margin-bottom:12px}
.course-card .age{display:inline-block;font-size:12.5px;color:var(--primary);background:#ebf4ff;padding:3px 12px;border-radius:999px;font-weight:600}
.course-card.hot::after{content:"热门";position:absolute;top:14px;right:-30px;background:var(--accent);color:#fff;font-size:12px;padding:3px 36px;transform:rotate(40deg)}
@media(max-width:960px){.course-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.course-grid{grid-template-columns:1fr}}

/* ===== 上课展示：视频 + 照片 ===== */
.showcase{background:var(--light)}
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.video-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 14px rgba(0,0,0,.06)}
.video-card video,.video-card .placeholder-video{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;background:#1a202c}
.video-card .placeholder-video{display:flex;align-items:center;justify-content:center;color:#718096;font-size:14px;flex-direction:column;gap:8px}
.video-card .placeholder-video .play{width:54px;height:54px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px}
.video-card .cap{padding:14px 18px;font-size:14.5px;font-weight:600}
.video-card .cap small{display:block;color:var(--gray);font-weight:400;margin-top:2px}
@media(max-width:720px){.video-grid{grid-template-columns:1fr}}
.photo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px}
.photo-grid .ph{aspect-ratio:4/3;border-radius:12px;background:linear-gradient(135deg,#dfe9f5,#c3d7ef);display:flex;align-items:center;justify-content:center;color:#5a7ca6;font-size:13px;text-align:center;padding:10px;transition:.2s}
.photo-grid .ph:hover{transform:scale(1.03)}
@media(max-width:720px){.photo-grid{grid-template-columns:repeat(2,1fr)}}

/* ===== 赛事预告条 ===== */
.contest-band{background:linear-gradient(120deg,#2b6cb0,#3182ce);color:#fff;border-radius:var(--radius);padding:38px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.contest-band h3{font-size:22px;margin-bottom:6px}
.contest-band p{opacity:.9;font-size:14.5px}

/* ===== 底部 ===== */
footer{background:var(--dark);color:#a0aec0;padding:52px 0 30px;font-size:14px}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;margin-bottom:36px}
footer h4{color:#fff;font-size:16px;margin-bottom:14px}
footer a:hover{color:#fff}
footer li{list-style:none;margin-bottom:8px}
footer .copyright{border-top:1px solid #2d3748;padding-top:20px;text-align:center;font-size:13px}
@media(max-width:720px){footer .cols{grid-template-columns:1fr}}

/* ===== 占位壳（未完成页面用）===== */
.page-hero{background:linear-gradient(135deg,#1e4e8c,#4299e1);color:#fff;text-align:center;padding:64px 20px}
.page-hero h1{font-size:clamp(24px,4vw,34px)}
.page-hero p{opacity:.9;margin-top:8px}

/* ============================================================
   课程介绍页（courses.html）专用样式
   ============================================================ */
/* 页头小标题 */
.page-hero .en{display:block;font-size:13px;letter-spacing:3px;opacity:.7;margin-bottom:6px;text-transform:uppercase}

/* 课程快速锚点导航 */
.anchor-bar{position:sticky;top:64px;background:#fff;border-bottom:1px solid #e2e8f0;z-index:90}
.anchor-bar .inner{display:flex;gap:10px;overflow-x:auto;padding:12px 0;scrollbar-width:none}
.anchor-bar .inner::-webkit-scrollbar{display:none}
.anchor-bar a{flex:0 0 auto;font-size:14px;padding:6px 16px;border-radius:999px;background:var(--light);color:var(--gray);border:1px solid #e2e8f0;transition:.2s}
.anchor-bar a:hover{background:#ebf4ff;color:var(--primary);border-color:var(--primary)}
@media(max-width:720px){.anchor-bar{top:0;position:relative}}

/* 单个课程区块 */
.course-block{padding:64px 0;border-bottom:1px dashed #e2e8f0}
.course-block:nth-child(even){background:var(--light)}
.course-block .head{display:flex;align-items:center;gap:16px;margin-bottom:8px;flex-wrap:wrap}
.course-block .head .icon{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,#ebf4ff,#d5e6fb);display:flex;align-items:center;justify-content:center;font-size:28px;flex:0 0 auto}
.course-block h2{font-size:clamp(20px,3vw,26px)}
.course-block .head .age{font-size:13px;color:#fff;background:var(--primary);padding:4px 14px;border-radius:999px;font-weight:600}
.course-block .head .age.orange{background:var(--accent)}
.course-block .lead{color:var(--gray);font-size:15.5px;margin:10px 0 26px;max-width:820px}
.course-block .two-col{display:grid;grid-template-columns:1.3fr 1fr;gap:30px;align-items:start}
@media(max-width:860px){.course-block .two-col{grid-template-columns:1fr}}

/* 学习内容列表 */
.points{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:12px 22px}
@media(max-width:600px){.points{grid-template-columns:1fr}}
.points li{position:relative;padding-left:22px;font-size:14.5px;color:var(--gray)}
.points li::before{content:"";position:absolute;left:0;top:10px;width:8px;height:8px;border-radius:3px;background:var(--accent)}

/* 右侧信息卡 */
.info-card{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius);padding:22px 24px;box-shadow:0 4px 14px rgba(0,0,0,.04)}
.info-card h4{font-size:15px;margin-bottom:12px;color:var(--primary)}
.info-card dl{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;font-size:14px}
.info-card dt{color:#a0aec0}
.info-card dd{color:var(--dark);font-weight:600}
.info-card .mini-btn{display:block;text-align:center;margin-top:18px;background:var(--accent);color:#fff;padding:10px;border-radius:999px;font-size:14px;font-weight:600}
.info-card .mini-btn:hover{filter:brightness(1.05)}

/* 作品/教室图片位 */
.course-media{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:26px}
.course-media .m{aspect-ratio:4/3;border-radius:12px;overflow:hidden;background:linear-gradient(135deg,#dfe9f5,#c3d7ef);display:flex;align-items:center;justify-content:center;color:#5a7ca6;font-size:13px;text-align:center;padding:10px}
.course-media .m img{width:100%;height:100%;object-fit:cover}
@media(max-width:720px){.course-media{grid-template-columns:repeat(2,1fr)}}

/* 成长路径 */
.path-line{display:flex;align-items:stretch;gap:0;margin-top:30px;overflow-x:auto;padding-bottom:6px}
.path-step{flex:1 0 150px;text-align:center;position:relative;padding:0 10px}
.path-step::after{content:"→";position:absolute;right:-6px;top:16px;color:#cbd5e0;font-size:18px}
.path-step:last-child::after{display:none}
.path-step .dot{width:40px;height:40px;margin:0 auto 10px;border-radius:50%;background:#ebf4ff;color:var(--primary);font-weight:800;display:flex;align-items:center;justify-content:center}
.path-step .nm{font-size:14.5px;font-weight:700}
.path-step .ds{font-size:12.5px;color:#a0aec0;margin-top:2px}

/* 底部 CTA */
.cta-end{background:linear-gradient(135deg,#1e4e8c,#3182ce);color:#fff;text-align:center;border-radius:var(--radius);padding:46px 30px;margin:60px 0}
.cta-end h3{font-size:22px;margin-bottom:8px}
.cta-end p{opacity:.9;font-size:14.5px;margin-bottom:22px}

/* ============================================================
   赛事服务页（contests.html）专用样式
   ============================================================ */
/* 服务流程四步 */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:flow}
.flow .step{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius);padding:26px 22px;position:relative;transition:.25s}
.flow .step:hover{box-shadow:0 12px 26px rgba(43,108,176,.12);transform:translateY(-4px)}
.flow .step .no{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.flow .step h3{font-size:16px;margin-bottom:8px}
.flow .step p{font-size:13.5px;color:var(--gray)}
@media(max-width:860px){.flow{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.flow{grid-template-columns:1fr}}

/* 赛事分类卡 */
.event-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.event-card{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius);overflow:hidden;transition:.25s}
.event-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(43,108,176,.14)}
.event-card .top{padding:26px 24px 20px;background:linear-gradient(135deg,#ebf4ff,#d9e8fa)}
.event-card .top .ic{font-size:30px;margin-bottom:10px}
.event-card .top h3{font-size:18px}
.event-card .top .sub{font-size:13px;color:var(--primary);margin-top:4px}
.event-card .body{padding:20px 24px 24px}
.event-card .body p{font-size:14px;color:var(--gray);margin-bottom:14px}
.event-card .tags{display:flex;flex-wrap:wrap;gap:8px}
.event-card .tags span{font-size:12.5px;background:var(--light);border:1px solid #e2e8f0;color:var(--gray);padding:3px 10px;border-radius:999px}
@media(max-width:900px){.event-grid{grid-template-columns:1fr}}

/* 荣誉榜 */
.honor{background:var(--light)}
.honor-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.honor-item{background:#fff;border-radius:var(--radius);padding:24px 20px;text-align:center;border:1px solid #e2e8f0}
.honor-item .medal{font-size:28px;margin-bottom:8px}
.honor-item .nm{font-size:14.5px;font-weight:700;margin-bottom:4px}
.honor-item .ds{font-size:12.5px;color:#a0aec0}
@media(max-width:860px){.honor-grid{grid-template-columns:repeat(2,1fr)}}

/* 荣誉照片位 */
.photo-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px}
.photo-row .m{aspect-ratio:4/3;border-radius:12px;background:linear-gradient(135deg,#dfe9f5,#c3d7ef);display:flex;align-items:center;justify-content:center;color:#5a7ca6;font-size:13px;text-align:center;padding:10px;overflow:hidden}
.photo-row .m img{width:100%;height:100%;object-fit:cover}
@media(max-width:720px){.photo-row{grid-template-columns:repeat(2,1fr)}}

/* 赛事时间轴 */
.timeline{position:relative;margin-top:10px;padding-left:26px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:#dbe7f5}
.tl-item{position:relative;padding:0 0 26px 8px}
.tl-item::before{content:"";position:absolute;left:-26px;top:6px;width:16px;height:16px;border-radius:50%;background:#fff;border:3px solid var(--primary)}
.tl-item .mth{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:1px}
.tl-item h4{font-size:16px;margin:2px 0 4px}
.tl-item p{font-size:14px;color:var(--gray)}

/* 常见问题 */
.faq-item{background:#fff;border:1px solid #e2e8f0;border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{cursor:pointer;list-style:none;padding:16px 20px;font-size:15px;font-weight:600;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"＋";color:var(--primary);font-weight:700}
.faq-item[open] summary::after{content:"－"}
.faq-item .ans{padding:0 20px 18px;font-size:14px;color:var(--gray)}

/* ============================================================
   关于我们页（about.html）专用样式
   ============================================================ */
/* 品牌介绍两栏 */
.about-intro{display:grid;grid-template-columns:1.15fr 1fr;gap:40px;align-items:center}
@media(max-width:860px){.about-intro{grid-template-columns:1fr}}
.about-intro h2{font-size:clamp(21px,3vw,28px);margin-bottom:16px;line-height:1.45}
.about-intro h2 em{font-style:normal;color:var(--accent)}
.about-intro p{color:var(--gray);font-size:15px;margin-bottom:14px}
.about-intro .pic{aspect-ratio:4/3;border-radius:var(--radius);overflow:hidden;background:linear-gradient(135deg,#dfe9f5,#c3d7ef);display:flex;align-items:center;justify-content:center;color:#5a7ca6;font-size:14px;text-align:center;padding:16px}
.about-intro .pic img{width:100%;height:100%;object-fit:cover}

/* 理念三卡 */
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.value-card{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius);padding:28px 24px;transition:.25s}
.value-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(43,108,176,.12)}
.value-card .ic{width:48px;height:48px;border-radius:12px;background:#ebf4ff;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:14px}
.value-card h3{font-size:17px;margin-bottom:8px}
.value-card p{font-size:14px;color:var(--gray)}
@media(max-width:860px){.value-grid{grid-template-columns:1fr}}

/* 环境展示 */
.env-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.env-grid .m{aspect-ratio:4/3;border-radius:12px;overflow:hidden;background:linear-gradient(135deg,#dfe9f5,#c3d7ef);display:flex;align-items:center;justify-content:center;color:#5a7ca6;font-size:13px;text-align:center;padding:10px}
.env-grid .m img{width:100%;height:100%;object-fit:cover}
.env-grid .m.wide{grid-column:span 2;aspect-ratio:auto}
@media(max-width:720px){.env-grid{grid-template-columns:1fr}.env-grid .m.wide{grid-column:span 1;aspect-ratio:4/3}}

/* 联系方式 + 地图 */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:30px;align-items:start}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}
.contact-list{list-style:none}
.contact-list li{display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed #e2e8f0;font-size:15px}
.contact-list li:last-child{border:none}
.contact-list .k{flex:0 0 74px;color:#a0aec0;font-size:14px}
.contact-list .v{color:var(--dark);font-weight:600}
.contact-list .v small{display:block;font-weight:400;color:var(--gray);font-size:13px;margin-top:2px}
.contact-list a.v{color:var(--primary)}
.map-box{border-radius:var(--radius);overflow:hidden;border:1px solid #e2e8f0;background:var(--light);min-height:320px;display:flex;align-items:center;justify-content:center;text-align:center;color:#7a93b3;font-size:14px;padding:24px;line-height:2}
.map-box iframe{width:100%;height:360px;border:0;display:block}

/* 到店指引 */
.guide{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.guide .g{background:#fff;border-radius:12px;border:1px solid #e2e8f0;padding:20px}
.guide .g .n{font-size:13px;color:var(--accent);font-weight:700;margin-bottom:6px}
.guide .g p{font-size:14px;color:var(--gray)}
@media(max-width:720px){.guide{grid-template-columns:1fr}}