/* ===== 基础 ===== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;background:#f7f8fa;color:#2c3e50;min-height:100vh;font-size:15px;line-height:1.6}
a{color:inherit;text-decoration:none}
::selection{background:#2563eb;color:#fff}

/* ===== 顶栏 ===== */
#topBar{position:fixed;top:0;left:0;right:0;height:60px;background:#fff;border-bottom:1px solid #eef0f2;display:flex;align-items:center;padding:0 28px;z-index:1000}
.logo{font-size:20px;font-weight:800;color:#2563eb;flex-shrink:0;letter-spacing:-.3px}
.nav{display:flex;gap:2px;margin-left:40px;overflow-x:auto;flex:1;-ms-overflow-style:none;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{font-size:14px;font-weight:500;color:#5b6778;padding:8px 16px;border-radius:8px;transition:all .2s;white-space:nowrap}
.nav a:hover{background:#eef4ff;color:#2563eb}
.nav a:first-child,.nav a.active{color:#2563eb;font-weight:600}
.top-right{flex-shrink:0;margin-left:auto}
.btn-entry{display:inline-block;padding:7px 20px;border-radius:8px;background:#2563eb;color:#fff;font-size:13px;font-weight:600;transition:all .2s}
.btn-entry:hover{background:#1d4ed8}

/* ===== 主内容 ===== */
#content{position:fixed;top:60px;left:0;right:0;bottom:0;overflow-y:auto;-webkit-overflow-scrolling:touch}
#content::-webkit-scrollbar{width:6px}
#content::-webkit-scrollbar-thumb{background:#cdd2da;border-radius:3px}
#content::-webkit-scrollbar-track{background:transparent}

/* ===== 轮播 ===== */
.carousel-wrap{max-width:1080px;margin:0 auto;padding:24px 24px 0}
.carousel{position:relative;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06);height:200px;cursor:pointer}
.carousel-inner{display:flex;height:100%;transition:transform .5s ease}
.carousel-slide{min-width:100%;display:flex;align-items:center;justify-content:center;color:#fff;padding:28px;text-align:center}
.slide-text h2{font-size:26px;font-weight:700;margin-bottom:4px}
.slide-text p{font-size:15px;opacity:.9}
.carousel-dots{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:6px}
.carousel-dots span{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.5);cursor:pointer;transition:all .25s}
.carousel-dots span.active{background:#fff;width:26px;border-radius:4px}

/* ===== 板块 ===== */
.section{max-width:1080px;margin:0 auto;padding:28px 24px 12px}
.section-title{font-size:17px;font-weight:700;margin-bottom:16px;display:flex;align-items:center;gap:8px;color:#1e293b}
.section-title .more{font-size:13px;font-weight:500;color:#94a3b8;margin-left:auto;cursor:pointer;transition:color .2s}
.section-title .more:hover{color:#2563eb}
.st-icon{font-size:18px}

/* ===== 列表卡片 ===== */
.list-card{background:#fff;border-radius:10px;border:1px solid #edf0f3;overflow:hidden}
.list-item{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid #f3f5f7;cursor:pointer;transition:background .15s}
.list-item:last-child{border-bottom:none}
.list-item:hover{background:#f8faff}
.list-item .li-cat{font-size:12px;font-weight:600;color:#2563eb;background:#eef4ff;padding:3px 10px;border-radius:5px;flex-shrink:0}
.list-item .li-title{flex:1;font-size:14px;color:#2c3e50;line-height:1.5}
.list-item .li-date{font-size:12px;color:#a0abba;flex-shrink:0}

/* ===== 院校网格 ===== */
.school-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.school-card{background:#fff;border-radius:10px;padding:20px 14px;text-align:center;border:1px solid #edf0f3;cursor:pointer;transition:all .2s}
.school-card:hover{border-color:#cdd6e0;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.school-card .sc-icon{font-size:32px;margin-bottom:6px;display:block}
.school-card .sc-name{font-size:14px;font-weight:600;color:#1e293b}
.school-card .sc-type{font-size:12px;color:#8899aa;margin-top:3px}
.school-card .sc-badge{display:inline-block;font-size:10px;font-weight:600;padding:2px 8px;border-radius:4px;background:#eef4ff;color:#2563eb;margin-top:5px}

/* ===== 视频网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.video-card{background:#fff;border-radius:10px;overflow:hidden;border:1px solid #edf0f3;cursor:pointer;transition:all .2s}
.video-card:hover{border-color:#cdd6e0;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.vc-thumb{height:100px;display:flex;align-items:center;justify-content:center;position:relative}
.vc-play{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.92);display:flex;align-items:center;justify-content:center;color:#2563eb;box-shadow:0 1px 4px rgba(0,0,0,.12);transition:all .2s}
.video-card:hover .vc-play{transform:scale(1.1)}
.vc-play::after{content:"▶";font-size:13px;margin-left:1px}
.vc-name{font-size:13px;font-weight:600;padding:10px 14px 4px;color:#1e293b}
.vc-sub{font-size:12px;color:#8899aa;padding:0 14px 10px}

/* ===== 页脚 ===== */
footer{max-width:1080px;margin:0 auto;padding:24px 24px 32px;text-align:center;border-top:1px solid #eef0f2;margin-top:16px}
.footer-links{font-size:13px;color:#94a3b8}
.footer-links a{transition:color .2s}
.footer-links a:hover{color:#2563eb}

/* ===== AI客服 ===== */
.ai-btn{position:fixed;bottom:28px;right:28px;width:48px;height:48px;border-radius:50%;background:#2563eb;color:#fff;font-size:22px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 12px rgba(37,99,235,.3);cursor:pointer;z-index:9999;transition:all .2s}
.ai-btn:hover{transform:scale(1.08);box-shadow:0 4px 16px rgba(37,99,235,.35)}
.ai-panel{position:fixed;bottom:86px;right:28px;width:360px;height:460px;background:#fff;border-radius:14px;box-shadow:0 8px 40px rgba(0,0,0,.12);display:flex;flex-direction:column;z-index:9999;overflow:hidden;border:1px solid #edf0f3}
.ai-panel.hide{display:none}
.ai-header{padding:14px 18px;background:#2563eb;color:#fff;font-weight:600;display:flex;justify-content:space-between;align-items:center;font-size:15px}
.ai-body{flex:1;overflow-y:auto;padding:14px 16px;background:#f8faff}
.ai-msg{margin-bottom:10px;max-width:86%;padding:10px 15px;border-radius:12px;font-size:13px;line-height:1.6;clear:both;word-wrap:break-word}
.ai-msg.ai{float:left;background:#fff;color:#2c3e50;border:1px solid #edf0f3;border-bottom-left-radius:3px}
.ai-msg.user{float:right;background:#2563eb;color:#fff;border-bottom-right-radius:3px}
.ai-msg.system{float:none;text-align:center;background:transparent;color:#94a3b8;font-size:12px;max-width:100%}
.ai-footer{display:flex;padding:10px 14px;border-top:1px solid #edf0f3;gap:8px;background:#fff}
.ai-input{flex:1;padding:10px 14px;border:1px solid #dce0e6;border-radius:8px;font-size:13px;outline:none;font-family:inherit}
.ai-input:focus{border-color:#2563eb}
.ai-send{padding:10px 18px;border:none;border-radius:8px;background:#2563eb;color:#fff;font-size:13px;font-weight:600;cursor:pointer;transition:background .2s}
.ai-send:hover{background:#1d4ed8}

/* ===== 子页面搜索 ===== */
.filter-bar,.search-bar{padding:14px 0}
.search-input{width:100%;padding:11px 16px;border:1px solid #dce0e6;border-radius:8px;font-size:14px;outline:none;font-family:inherit;background:#fff}
.search-input:focus{border-color:#2563eb}

/* ===== 筛选标签 ===== */
.filters,.subj-tabs,.subj-filters{display:flex;gap:6px;margin-bottom:14px;flex-wrap:wrap}
.filters span,.subj-tabs span,.subj-filters span{padding:6px 16px;border-radius:8px;font-size:13px;font-weight:500;background:#f1f3f6;color:#5b6778;cursor:pointer;transition:all .15s;border:1px solid transparent}
.filters span:hover,.subj-tabs span:hover,.subj-filters span:hover{background:#e4e8ef}
.filters span.active,.subj-tabs span.active,.subj-filters span.active{background:#2563eb;color:#fff}

/* ===== 专业卡片 ===== */
.major-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.major-card{background:#fff;border-radius:10px;padding:18px;border:1px solid #edf0f3;cursor:pointer;transition:all .2s}
.major-card:hover{border-color:#cdd6e0;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.major-card .mc-name{font-size:15px;font-weight:600;color:#1e293b}
.major-card .mc-cat{font-size:12px;color:#8899aa;margin:4px 0 4px}
.major-card .mc-desc{font-size:13px;color:#5b6778;line-height:1.6}
.major-card .mc-hot{display:inline-block;font-size:11px;font-weight:600;padding:2px 8px;border-radius:4px;background:#fef2f2;color:#dc2626;margin-top:5px}

/* ===== 加载 ===== */
.loading{text-align:center;padding:28px;color:#94a3b8;font-size:14px}
.loading::after{content:'';display:block;width:20px;height:20px;border:2px solid #e4e8ef;border-top-color:#2563eb;border-radius:50%;margin:10px auto 0;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.hide{display:none!important}

/* ===== 模态框 ===== */
.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.45);z-index:9998;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s}
.modal-box{background:#fff;border-radius:14px;width:90%;max-width:620px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 12px 48px rgba(0,0,0,.15);animation:slideUp .25s}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid #edf0f3}
.modal-title{font-size:16px;font-weight:700;color:#1e293b;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.modal-close{width:30px;height:30px;border-radius:50%;border:none;background:#f1f3f6;color:#5b6778;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s;flex-shrink:0}
.modal-close:hover{background:#e4e8ef}
.modal-body{padding:20px 22px;overflow-y:auto;font-size:14px;line-height:1.8;color:#3a4a5e}
.modal-body::-webkit-scrollbar{width:4px}
.modal-body::-webkit-scrollbar-thumb{background:#cdd2da;border-radius:2px}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}

/* ===== 视频播放器 ===== */
.video-player{width:100%;max-height:50vh;background:#000;border-radius:8px;outline:none;display:block}
.video-placeholder{text-align:center;padding:48px 16px;color:#94a3b8;font-size:14px}
.video-placeholder .vp-icon{font-size:48px;margin-bottom:12px;display:block}

/* ===== 高三备考专区 ===== */
.gk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.gk-card{background:linear-gradient(135deg,#fff,#f8faff);border-radius:12px;padding:20px 14px;border:1px solid #e8edf5;cursor:pointer;transition:all .2s;text-align:center}
.gk-card:hover{border-color:#2563eb;box-shadow:0 4px 16px rgba(37,99,235,.1);transform:translateY(-2px)}
.gk-card .gk-icon{font-size:28px;display:block;margin-bottom:8px}
.gk-card .gk-name{font-size:13px;font-weight:600;color:#1e293b}
.gk-card .gk-sub{font-size:11px;color:#8899aa;margin-top:3px}
.gk-card .gk-tag{display:inline-block;font-size:10px;font-weight:600;padding:2px 8px;border-radius:4px;background:#fef2f2;color:#dc2626;margin-top:6px}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .carousel{height:170px}
  .slide-text h2{font-size:22px}
}
@media(max-width:768px){
  #topBar{padding:0 14px;height:54px}
  #content{top:54px}
  .logo{font-size:18px}
  .nav{margin-left:16px}
  .nav a{font-size:13px;padding:6px 10px}
  .btn-entry{font-size:12px;padding:5px 14px}
  .carousel-wrap,.section{padding-left:16px;padding-right:16px}
  .carousel{height:150px;border-radius:10px}
  .slide-text h2{font-size:20px}
  .slide-text p{font-size:14px}
  .school-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .video-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .major-grid{grid-template-columns:repeat(2,1fr)}
  .ai-panel{width:calc(100vw - 32px);right:16px}
}
@media(max-width:480px){
  body{font-size:14px}
  #topBar{height:50px}
  #content{top:50px}
  .nav a{font-size:12px;padding:4px 8px}
  .carousel{height:130px}
  .slide-text h2{font-size:17px}
  .school-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .major-grid{grid-template-columns:1fr}
}