:root{
  --blue-900:#1E3A8A;
  --blue-700:#1D4ED8;
  --blue-600:#2563EB;
  --blue-500:#3B82F6;
  --blue-400:#60A5FA;
  --blue-200:#BFDBFE;
  --blue-100:#DBEAFE;
  --blue-50:#EFF6FF;
  --blue-25:#F7FAFF;
  --orange-600:#EA580C;
  --orange-500:#F59E0B;
  --orange-100:#FEF3C7;
  --ink:#0F172A;
  --slate:#475569;
  --slate-2:#64748B;
  --line:#E3EAF5;
  --white:#FFFFFF;
  --radius-lg:20px;
  --radius-md:14px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05);
  --shadow-md:0 6px 18px rgba(15,23,42,.07);
  --font-display:'ZCOOL QingKe HuangYou','Noto Sans SC',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Noto Sans SC',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{font-family:var(--font-body);color:var(--ink);background:var(--white);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{max-width:1140px;margin:0 auto;padding:0 20px}
.section{padding:clamp(56px,8vw,96px) 0}
.sec-head{margin-bottom:clamp(28px,4vw,44px)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--blue-600);letter-spacing:.12em;text-transform:uppercase}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--blue-500)}
.sec-title{font-size:clamp(26px,4vw,38px);font-weight:900;line-height:1.35;margin-top:12px;letter-spacing:.01em}
.sec-desc{margin-top:14px;color:var(--slate);font-size:15px;max-width:640px}
/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--blue-600),var(--blue-500));display:flex;align-items:center;justify-content:center;flex-shrink:0}
.brand-mark svg{width:22px;height:22px}
.brand-name{font-family:var(--font-display);font-size:23px;font-weight:400;color:var(--blue-700);letter-spacing:.04em}
.brand-name b{color:var(--orange-600)}
.nav-links{display:none;align-items:center;gap:30px;list-style:none}
.nav-links a{font-size:15px;font-weight:500;color:var(--slate);transition:color .2s;position:relative}
.nav-links a:hover{color:var(--blue-600)}
.nav-links a.active{color:var(--blue-600);font-weight:700}
.nav-links a.active::after{content:"";position:absolute;left:50%;bottom:-16px;transform:translateX(-50%);width:16px;height:3px;border-radius:2px;background:var(--blue-600)}
.nav-cta{display:none}
.nav-cta a{display:inline-flex;align-items:center;gap:6px;background:var(--blue-600);color:#fff;font-size:14px;font-weight:700;padding:9px 18px;border-radius:999px;transition:background .2s}
.nav-cta a:hover{background:var(--blue-700)}
.nav-toggle{display:flex;flex-direction:column;gap:5px;padding:8px;border-radius:8px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s,opacity .25s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-menu{display:none;border-top:1px solid var(--line);background:#fff;padding:8px 0 14px}
.mobile-menu[data-open="true"]{display:block}
.mobile-menu a{display:block;padding:12px 20px;font-size:15px;font-weight:500;color:var(--ink)}
.mobile-menu a.active{color:var(--blue-600);font-weight:700;background:var(--blue-25)}
.mobile-menu .m-cta{margin:10px 20px 0;background:var(--blue-600);color:#fff;text-align:center;padding:12px;border-radius:12px;font-weight:700;font-size:15px}
/* ===== 内页头部 ===== */
.page-head{position:relative;background:linear-gradient(180deg,var(--blue-25) 0%,#EDF5FF 60%,var(--blue-50) 100%);overflow:hidden}
.page-head::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(37,99,235,.10) 1.2px,transparent 1.2px);background-size:26px 26px;pointer-events:none}
.page-head .container{position:relative;padding-top:clamp(40px,6vw,64px);padding-bottom:clamp(40px,6vw,60px)}
.page-head h1{font-size:clamp(30px,4.6vw,44px);font-weight:900;line-height:1.3;margin-top:14px}
.page-head p{margin-top:14px;color:var(--slate);font-size:15px;max-width:660px}
.page-head + .section{padding-top:clamp(44px,6vw,72px)}
/* ===== Hero ===== */
.hero{position:relative;background:linear-gradient(180deg,var(--blue-25) 0%,#EDF5FF 55%,var(--blue-50) 100%);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(37,99,235,.10) 1.2px,transparent 1.2px);background-size:26px 26px;pointer-events:none}
.hero-inner{position:relative;display:grid;gap:32px;padding:clamp(40px,6vw,72px) 0 clamp(48px,6vw,80px)}
.hero-copy{max-width:620px}
.hero-badge{display:inline-flex;align-items:center;gap:7px;background:var(--white);border:1px solid var(--blue-200);color:var(--blue-700);font-size:13px;font-weight:700;padding:6px 14px;border-radius:999px;box-shadow:var(--shadow-sm)}
.hero-badge svg{width:14px;height:14px}
.hero h1{font-size:clamp(34px,5.4vw,54px);font-weight:900;line-height:1.25;margin:20px 0 18px;letter-spacing:.01em}
.hero h1 .hl{color:var(--blue-600)}
.hero h1 .hl2{color:var(--orange-600)}
.hero-sub{font-size:clamp(15px,2vw,17px);color:var(--slate);max-width:540px}
.hero-ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;font-weight:700;padding:13px 26px;border-radius:999px;transition:transform .18s,box-shadow .18s,background .18s}
.btn-primary{background:var(--blue-600);color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.28)}
.btn-primary:hover{background:var(--blue-700);transform:translateY(-1px);box-shadow:0 12px 24px rgba(37,99,235,.34)}
.btn-ghost{background:var(--white);color:var(--blue-700);border:1px solid var(--blue-200);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{border-color:var(--blue-500);transform:translateY(-1px)}
.btn-light{background:#fff;color:var(--blue-700);box-shadow:0 8px 20px rgba(0,0,0,.18)}
.btn-light:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(0,0,0,.24)}
.btn svg{width:16px;height:16px}
.hero-stats{display:flex;flex-wrap:wrap;gap:clamp(18px,4vw,44px);margin-top:34px;padding-top:26px;border-top:1px solid rgba(37,99,235,.16)}
.hero-stat b{display:block;font-size:clamp(24px,3.4vw,32px);font-weight:900;color:var(--blue-700);line-height:1.2}
.hero-stat span{font-size:13px;color:var(--slate-2);font-weight:500}
.hero-visual{position:relative}
.hero-visual img{border-radius:var(--radius-lg);box-shadow:0 24px 60px rgba(15,23,42,.16);width:100%;height:auto}
.hero-visual::after{content:"";position:absolute;inset:auto -18px -18px auto;width:120px;height:120px;border-radius:28px;background:radial-gradient(circle at 30% 30%,var(--orange-100),rgba(245,158,11,.14));z-index:-1}
.float-chip{position:absolute;display:none}
/* ===== 优势 ===== */
.pillars{background:var(--white)}
.pillars-grid{display:grid;grid-template-columns:1fr;gap:16px}
.pillar{position:relative;background:var(--blue-25);border:1px solid var(--blue-100);border-radius:var(--radius-md);padding:24px 22px;transition:transform .2s,box-shadow .2s}
.pillar:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.pillar::before{content:"";position:absolute;left:0;top:22px;bottom:22px;width:4px;border-radius:4px;background:linear-gradient(180deg,var(--blue-500),var(--blue-400))}
.pillar:nth-child(2)::before{background:linear-gradient(180deg,var(--orange-500),#FCD34D)}
.pillar:nth-child(3)::before{background:linear-gradient(180deg,#0EA5E9,var(--blue-400))}
.pillar:nth-child(4)::before{background:linear-gradient(180deg,#6366F1,var(--blue-500))}
.pillar-icon{width:44px;height:44px;border-radius:12px;background:var(--white);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);margin-bottom:14px}
.pillar-icon svg{width:24px;height:24px;stroke:var(--blue-600);stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round}
.pillar h3{font-size:18px;font-weight:900;margin-bottom:8px}
.pillar p{font-size:14px;color:var(--slate)}
/* ===== 首页速览 ===== */
.teaser-grid{display:grid;gap:18px;margin-top:8px}
.teaser{background:var(--blue-25);border:1px solid var(--blue-100);border-radius:var(--radius-lg);padding:clamp(22px,3.4vw,34px);display:grid;gap:18px}
.teaser-dark{background:linear-gradient(135deg,var(--blue-900),#1E40AF);border-color:var(--blue-900);color:#fff}
.teaser h3{font-size:clamp(18px,2.6vw,22px);font-weight:900}
.teaser p{font-size:14px;color:var(--slate)}
.teaser-dark p{color:rgba(255,255,255,.82)}
.teaser .t-sub{margin-top:-8px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:12.5px;font-weight:700;color:var(--blue-700);background:var(--white);border:1px solid var(--blue-200);border-radius:999px;padding:5px 12px}
.teaser-dark .chip{color:#DBEAFE;background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.24)}
.link-more{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:700;color:var(--blue-600);width:fit-content}
.teaser-dark .link-more{color:#FDE68A}
.link-more svg{width:15px;height:15px;transition:transform .2s}
.link-more:hover svg{transform:translateX(3px)}
.mini-path{display:flex;flex-wrap:wrap;gap:10px 14px;align-items:center}
.mini-path .mp{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:#E2E8F0}
.mini-path .mp b{width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.14);display:flex;align-items:center;justify-content:center;font-size:12px;color:#FDE68A}
.mini-path .arr{color:var(--orange-500);font-weight:900}
/* ===== CTA 横幅 ===== */
.cta-band{background:linear-gradient(135deg,var(--blue-700),var(--blue-900));color:#fff}
.cta-inner{display:grid;gap:20px;padding:clamp(40px,6vw,64px) 20px;align-items:center}
.cta-inner h2{font-size:clamp(22px,3.4vw,32px);font-weight:900;line-height:1.35}
.cta-inner p{margin-top:10px;font-size:14.5px;color:rgba(255,255,255,.82);max-width:520px}
.cta-inner .btn{width:fit-content}
/* ===== 课程阶梯 ===== */
.courses{background:linear-gradient(180deg,var(--blue-50),var(--blue-25) 40%,#fff)}
.ladder{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:8px}
.step{position:relative;background:var(--white);border:1px solid var(--blue-100);border-radius:var(--radius-md);padding:20px 18px 18px;box-shadow:var(--shadow-sm);transition:transform .2s,border-color .2s,box-shadow .2s}
.step:hover{transform:translateY(-3px);border-color:var(--blue-400);box-shadow:var(--shadow-md)}
.step-top{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.step-level{font-size:17px;font-weight:900;color:var(--blue-700)}
.step-level em{font-style:normal;font-size:12px;font-weight:700;color:var(--orange-600);background:var(--orange-100);border-radius:999px;padding:2px 10px;margin-left:8px;vertical-align:1px}
.step-no{font-family:var(--font-display);font-size:26px;color:var(--blue-200);line-height:1}
.step-points{margin-top:12px;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.step-points li{position:relative;padding-left:16px;font-size:13px;color:var(--slate);line-height:1.55}
.step-points li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:50%;background:var(--blue-400)}
.step-foot{margin-top:12px;font-size:12px;color:var(--slate-2);border-top:1px dashed var(--blue-100);padding-top:10px}
.course-note{margin-top:16px;font-size:12.5px;color:var(--slate-2)}
.race-grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:34px}
.race-card{position:relative;background:var(--blue-900);color:#fff;border-radius:var(--radius-md);padding:26px 22px;overflow:hidden}
.race-card::after{content:"";position:absolute;right:-40px;top:-40px;width:150px;height:150px;border-radius:50%;background:rgba(255,255,255,.06)}
.race-card:nth-child(2){background:linear-gradient(135deg,#0C4A6E,#0EA5E9)}
.race-card:nth-child(3){background:linear-gradient(135deg,#7C2D12,#EA580C)}
.race-tag{display:inline-block;font-size:12px;font-weight:700;background:rgba(255,255,255,.16);padding:3px 10px;border-radius:999px;margin-bottom:10px}
.race-card h3{font-size:19px;font-weight:900;margin-bottom:6px}
.race-card p{font-size:13.5px;color:rgba(255,255,255,.85);max-width:520px}
.race-card .race-meta{margin-top:12px;font-size:12.5px;color:rgba(255,255,255,.7)}
.race-card .race-meta b{color:#FDE68A;font-weight:700}
/* ===== 竞赛科普 ===== */
.contests{background:var(--white)}
.path-label{font-size:14px;font-weight:700;color:var(--blue-600);margin-bottom:18px}
.path-grid{display:grid;gap:0}
.path-item{position:relative;padding:0 0 26px 26px}
.path-item::before{content:"";position:absolute;left:7px;top:6px;bottom:-2px;width:2px;background:linear-gradient(180deg,var(--blue-400),var(--orange-500))}
.path-item:last-child::before{display:none}
.path-dot{position:absolute;left:0;top:4px;width:16px;height:16px;border-radius:50%;background:var(--white);border:4px solid var(--blue-500);z-index:1}
.path-item.lv-orange .path-dot{border-color:var(--orange-500)}
.path-item.lv-green .path-dot{border-color:#0EA5E9}
.path-item h4{font-size:15px;font-weight:900;color:var(--ink)}
.path-item h4 span{display:block;font-size:12px;font-weight:700;color:var(--blue-600);margin-bottom:2px}
.path-item p{font-size:13px;color:var(--slate);margin-top:4px}
.calendar{margin-top:40px;background:var(--blue-25);border:1px solid var(--blue-100);border-radius:var(--radius-lg);padding:clamp(20px,3vw,32px)}
.cal-head{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:900;margin-bottom:20px}
.cal-head svg{width:20px;height:20px;stroke:var(--blue-600);fill:none;stroke-width:2}
.cal-list{display:grid;gap:12px}
.cal-item{display:grid;grid-template-columns:74px 1fr;gap:14px;align-items:start;background:var(--white);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow-sm)}
.cal-date{text-align:center;background:var(--blue-600);color:#fff;border-radius:10px;padding:8px 0 6px}
.cal-date b{display:block;font-size:18px;font-weight:900;line-height:1.1}
.cal-date span{font-size:11px;opacity:.9}
.cal-item .cal-body b{font-size:14.5px;font-weight:700;display:block}
.cal-item .cal-body p{font-size:12.5px;color:var(--slate-2);margin-top:2px}
.cal-item.orange .cal-date{background:var(--orange-500)}
.cal-item.teal .cal-date{background:#0EA5E9}
.cal-item.dark .cal-date{background:var(--blue-900)}
.cal-note{margin-top:14px;font-size:12px;color:var(--slate-2)}
.policy-grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:34px}
.policy{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);padding:22px 20px}
.policy h3{font-size:15.5px;font-weight:900;display:flex;align-items:center;gap:10px;margin-bottom:12px}
.policy h3 svg{width:22px;height:22px;flex-shrink:0;stroke:var(--orange-600);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.policy .p-rule{font-size:14px;color:var(--slate);padding-left:32px;margin-bottom:8px;position:relative}
.policy .p-rule::before{content:"";position:absolute;left:14px;top:10px;width:7px;height:7px;border-radius:50%;background:var(--blue-500)}
.policy .p-rule b{color:var(--blue-700)}
.policy-note{margin-top:8px;padding-left:32px;font-size:12.5px;color:var(--slate-2)}
/* ===== 师资与成果 ===== */
.teachers{background:linear-gradient(180deg,#fff,var(--blue-25))}
.teacher-grid{display:grid;grid-template-columns:1fr;gap:16px}
.teach-head{display:grid;gap:20px;align-items:end}
.teach-img img{border-radius:var(--radius-md);box-shadow:var(--shadow-md);width:100%;height:auto}
.teacher{background:var(--white);border:1px solid var(--blue-100);border-radius:var(--radius-md);padding:26px 22px;text-align:center;box-shadow:var(--shadow-sm)}
.teacher-ava{width:84px;height:84px;margin:0 auto 14px;border-radius:50%;background:linear-gradient(135deg,var(--blue-100),var(--blue-50));display:flex;align-items:center;justify-content:center;border:2px dashed var(--blue-300,#93C5FD)}
.teacher-ava svg{width:38px;height:38px;stroke:var(--blue-400);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.teacher h3{font-size:17px;font-weight:900}
.teacher .t-role{font-size:13px;color:var(--blue-600);font-weight:700;margin-top:3px}
.teacher p{font-size:13px;color:var(--slate);margin-top:10px;line-height:1.65}
.teacher .t-tag{display:inline-block;margin-top:12px;font-size:11.5px;color:var(--orange-600);background:var(--orange-100);border-radius:999px;padding:3px 10px;font-weight:700}
.result-band{margin-top:34px;background:var(--blue-900);border-radius:var(--radius-lg);overflow:hidden;color:#fff}
.result-inner{display:grid;gap:0}
.result-text{padding:clamp(24px,4vw,40px)}
.result-text h3{font-size:clamp(20px,3vw,26px);font-weight:900;line-height:1.4}
.result-text p{font-size:14px;color:rgba(255,255,255,.85);margin-top:12px}
.result-text .r-placeholder{margin-top:16px;font-size:12.5px;color:#BFDBFE;background:rgba(255,255,255,.08);border:1px dashed rgba(255,255,255,.3);border-radius:10px;padding:10px 14px;display:inline-block}
.result-text a{color:#FDE68A;font-weight:700;text-decoration:underline;text-underline-offset:3px}
.result-img img{width:100%;height:100%;object-fit:cover}
/* ===== 报名咨询 ===== */
.contact{background:var(--white)}
.contact-grid{display:grid;gap:26px}
.contact-form{background:var(--blue-25);border:1px solid var(--blue-100);border-radius:var(--radius-lg);padding:clamp(22px,3.4vw,36px)}
.form-row{display:grid;gap:14px;margin-bottom:14px}
.form-group label{display:block;font-size:13.5px;font-weight:700;color:var(--ink);margin-bottom:6px}
.form-group input,.form-group select,.form-group textarea{width:100%;font-family:inherit;font-size:15px;padding:12px 14px;border:1px solid var(--blue-200);border-radius:10px;background:var(--white);color:var(--ink);outline:none;transition:border-color .2s,box-shadow .2s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--blue-500);box-shadow:0 0 0 3px rgba(59,130,246,.15)}
.form-group textarea{resize:vertical;min-height:84px}
.form-submit{width:100%;margin-top:6px}
.form-foot{margin-top:12px;font-size:12px;color:var(--slate-2);text-align:center}
.contact-info{display:grid;gap:16px;align-content:start}
.info-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);padding:20px 20px}
.info-card h3{font-size:15px;font-weight:900;display:flex;align-items:center;gap:9px;margin-bottom:10px}
.info-card h3 svg{width:19px;height:19px;stroke:var(--blue-600);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.info-card p{font-size:14px;color:var(--slate)}
.info-card .p-placeholder{margin-top:8px;font-size:12px;color:var(--orange-600);background:var(--orange-100);display:inline-block;border-radius:999px;padding:2px 10px;font-weight:700}
/* ===== 页脚 ===== */
.footer{background:var(--blue-900);color:#CBD5E1;padding:44px 0 28px;margin-top:0}
.footer-top{display:grid;gap:26px;padding-bottom:26px;border-bottom:1px solid rgba(255,255,255,.14)}
.footer-brand .brand-name{color:#fff;font-size:24px}
.footer-brand p{margin-top:10px;font-size:13px;color:#94A3B8;max-width:360px}
.footer-links{display:flex;flex-wrap:wrap;gap:18px;align-items:center}
.footer-links a{font-size:13.5px;color:#CBD5E1;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-bottom{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;padding-top:20px;font-size:12.5px;color:#94A3B8}
.footer-contact h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:10px;letter-spacing:.02em}
.footer-contact p{font-size:13px;color:#CBD5E1;margin:5px 0;line-height:1.65}
.footer-bottom a{color:#94A3B8;transition:color .2s}
.footer-bottom a:hover{color:#fff}
/* ===== Toast ===== */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,80px);background:var(--ink);color:#fff;font-size:14px;font-weight:500;padding:13px 22px;border-radius:999px;box-shadow:0 12px 30px rgba(15,23,42,.3);opacity:0;transition:transform .3s,opacity .3s;z-index:99;max-width:calc(100vw - 40px);text-align:center}
.toast[data-show="true"]{transform:translate(-50%,0);opacity:1}
.toast svg{width:16px;height:16px;vertical-align:-3px;margin-right:6px;stroke:#4ADE80;fill:none;stroke-width:2.4}
/* ===== 响应式 ===== */
@media (min-width:768px){
  .pillars-grid{grid-template-columns:repeat(2,1fr)}
  .teaser-grid{grid-template-columns:1fr 1fr;gap:20px}
  .cta-inner{grid-template-columns:1fr auto}
  .ladder{grid-template-columns:repeat(4,1fr);gap:18px}
  .race-grid{grid-template-columns:repeat(3,1fr)}
  .teacher-grid{grid-template-columns:repeat(3,1fr)}
  .policy-grid{grid-template-columns:repeat(3,1fr)}
  .contact-grid{grid-template-columns:1.15fr .85fr}
  .form-row{grid-template-columns:1fr 1fr}
  .result-inner{grid-template-columns:1.1fr .9fr}
  .footer-top{grid-template-columns:1.4fr 1fr 1fr}
}
@media (min-width:960px){
  .nav-links{display:flex}
  .nav-cta{display:block}
  .nav-toggle{display:none}
  .mobile-menu{display:none!important}
  .hero-inner{grid-template-columns:1.05fr .95fr;align-items:center}
  .float-chip{display:block;position:absolute;background:var(--white);border-radius:12px;box-shadow:var(--shadow-md);padding:10px 14px;font-size:12.5px;font-weight:700;color:var(--blue-700);display:flex;align-items:center;gap:8px}
  .float-chip svg{width:15px;height:15px;stroke:var(--orange-500);fill:none;stroke-width:2}
  .float-chip.f1{top:8%;left:-16px}
  .float-chip.f2{bottom:16%;right:-8px}
}
@media (min-width:768px) and (max-width:959px){
  .nav-links{display:flex;gap:20px}
  .nav-links a{font-size:14px}
  .nav-cta{display:none}
}
@media (min-width:768px){
  .teach-head{grid-template-columns:1.15fr .85fr;align-items:center}
  .path-grid{grid-template-columns:repeat(6,1fr);gap:12px}
  .path-item{padding:0;text-align:center}
  .path-item::before{display:none}
  .path-item .path-dot{position:relative;margin:0 auto 12px}
  .path-item .path-dot::after{content:"";position:absolute;left:100%;top:50%;width:calc(400% + 24px);height:2px;background:linear-gradient(90deg,var(--blue-400),var(--orange-500));z-index:0}
  .path-item:last-child .path-dot::after{display:none}
  .path-item h4 span{display:inline;font-size:11.5px}
  .path-item p{font-size:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}

/* ===== 悬浮入口：在线编译器 ===== */
.float-compiler{
  position:fixed;right:22px;bottom:22px;z-index:9999;
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:999px;
  background:linear-gradient(135deg,var(--blue-600),var(--blue-500));
  color:#fff;font-family:var(--font-body);font-size:14.5px;font-weight:700;
  box-shadow:0 8px 24px rgba(37,99,235,.35);
  border:1px solid rgba(255,255,255,.25);
  transition:transform .2s ease,box-shadow .2s ease;
}
.float-compiler .fc-icon{font-family:'JetBrains Mono',Consolas,monospace;font-weight:700;font-size:15px}
.float-compiler:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(37,99,235,.5)}
@media (max-width:640px){
  .float-compiler{padding:10px 16px;font-size:13.5px;right:14px;bottom:14px}
}

/* ===== 常用功能快捷栏（编译器页 / 资源页） ===== */
.res-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:14px}
.res-bar-title{font-weight:700;color:var(--blue-700);font-size:14px;margin-right:6px;letter-spacing:.02em}
.res-bar a{font-size:13px;color:var(--blue-600);background:#EFF6FF;border:1px solid var(--line);padding:5px 12px;border-radius:999px;text-decoration:none;transition:all .2s;font-weight:500}
.res-bar a:hover{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}
.res-bar a.active{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}

/* ===== 学习资源页 ===== */
.page-main{max-width:1020px;margin:0 auto;padding:36px 20px 64px}
.page-main h1{font-family:var(--font-display);color:var(--blue-900);font-size:30px;margin:0 0 8px;letter-spacing:.02em}
.page-lead{color:#475569;font-size:15px;margin:0 0 24px;line-height:1.8}
.page-main .res-bar{margin-bottom:22px}
.ref-grid{display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:768px){.ref-grid{grid-template-columns:1fr 1fr}}
.ref-grid.cols3{grid-template-columns:1fr}
@media (min-width:900px){.ref-grid.cols3{grid-template-columns:1fr 1fr 1fr}}
.ref-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;box-shadow:0 1px 3px rgba(15,23,42,.03)}
.ref-card h2{font-size:17px;color:var(--blue-700);margin:0 0 12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ref-card h2 .tag{font-size:11px;color:#64748B;background:#F1F5F9;padding:2px 9px;border-radius:999px;font-weight:500}
.ref-card ul{margin:0;padding:0;list-style:none}
.ref-card li{font-size:13.5px;color:#334155;line-height:1.9;padding:7px 0;border-bottom:1px dashed #E8EEF7}
.ref-card li:last-child{border-bottom:none}
.ref-card li code,.ref-card p code{background:#EFF6FF;color:#1D4ED8;padding:2px 6px;border-radius:6px;font-family:'JetBrains Mono',Consolas,monospace;font-size:12.5px}
.ref-card p{font-size:13.5px;color:#475569;line-height:1.75;margin:4px 0 0}
.ref-card p.cmt{font-size:12.5px;color:#94A3B8}
.code-block{position:relative;background:#F7FAFF;border:1px solid var(--line);color:#1E293B;border-radius:12px;padding:14px 16px;overflow-x:auto;font-family:'JetBrains Mono',Consolas,monospace;font-size:12.8px;line-height:1.7;margin:10px 0 0}
.code-block code{font-family:inherit;white-space:pre}
.code-copy{position:absolute;top:9px;right:9px;background:#EFF6FF;border:1px solid var(--line);color:var(--blue-600);font-size:11.5px;padding:3px 11px;border-radius:999px;cursor:pointer;transition:all .2s;font-weight:600}
.code-copy:hover{background:var(--blue-600);color:#fff;border-color:var(--blue-600)}
.ref-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;font-size:13.5px;margin-top:10px}
.ref-table th{background:#EFF6FF;color:var(--blue-700);text-align:left;padding:10px 14px;font-weight:700;font-size:13px}
.ref-table td{padding:9px 14px;color:#334155;border-top:1px solid #EEF2F9;vertical-align:top;line-height:1.65}
.ref-table tr:hover td{background:#FAFCFF}
.ref-table code{background:#EFF6FF;color:#1D4ED8;padding:2px 6px;border-radius:6px;font-family:'JetBrains Mono',Consolas,monospace;font-size:12px}
.placeholder-card{background:#fff;border:2px dashed #C7D6EE;border-radius:14px;padding:52px 24px;text-align:center;color:#64748B;margin-top:8px}
.placeholder-card .ph-title{font-size:19px;color:var(--blue-700);font-weight:700;margin-bottom:12px}
.placeholder-card p{font-size:14px;line-height:1.9;margin:6px 0}

/* ===== 悬浮"常用功能"入口（与编译器按钮同款样式） ===== */
.float-common{
  position:fixed;right:22px;bottom:86px;z-index:9999;
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:999px;
  background:linear-gradient(135deg,var(--blue-600),var(--blue-500));
  color:#fff;font-family:var(--font-body);font-size:14.5px;font-weight:700;
  box-shadow:0 8px 24px rgba(37,99,235,.35);
  border:1px solid rgba(255,255,255,.25);
  transition:transform .2s ease,box-shadow .2s ease;
  cursor:pointer;
}
.float-common:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(37,99,235,.5)}
.float-menu{position:fixed;right:22px;bottom:130px;z-index:9999;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 14px 36px rgba(15,23,42,.16);padding:8px;display:none;flex-direction:column;min-width:156px}
.float-menu[data-open="true"]{display:flex}
.float-menu a{font-size:13px;color:#334155;padding:8px 14px;border-radius:9px;text-decoration:none;transition:background .15s,color .15s}
.float-menu a:hover{background:#EFF6FF;color:var(--blue-600)}
@media (max-width:640px){
  .float-common{right:14px;bottom:82px;padding:10px 16px;font-size:13.5px}
  .float-menu{right:14px;bottom:124px}
}

/* ===== 资料库下拉菜单 ===== */
.nav-links .nav-drop{position:relative}
.nav-drop > .drop-menu{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 36px rgba(15,23,42,.14);padding:7px;min-width:158px;display:none;flex-direction:column;z-index:120}
.nav-drop:hover > .drop-menu{display:flex}
.nav-drop > .drop-menu::before{content:"";position:absolute;top:-10px;left:0;right:0;height:10px}
.drop-menu a{font-size:13px;color:#334155;padding:8px 14px;border-radius:9px;text-decoration:none;transition:background .15s,color .15s;white-space:nowrap;font-weight:500}
.drop-menu a:hover{background:#EFF6FF;color:var(--blue-600)}
.nav-drop > .nav-link{display:inline-flex;align-items:center;gap:5px}
.nav-drop > .nav-link::after{content:"";border:4px solid transparent;border-top-color:currentColor;margin-top:2px;opacity:.72}
.mobile-menu .m-sub{padding-left:38px;font-size:14px;color:#475569;font-weight:500}