:root{
  --orange:#f59b16; --blue:#1e88e5; --green:#8bc53f; --ink:#172033; --muted:#667085; --bg:#f7fafc; --card:#ffffff; --line:#e8edf3;
}
*{box-sizing:border-box} body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:#fff} a{text-decoration:none;color:inherit}
.site-header{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:14px 6vw;background:rgba(255,255,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand img{height:54px;display:block}.nav{display:flex;gap:26px;align-items:center;font-size:15px;color:#344054}.nav a:hover{color:var(--orange)}.nav-pill{padding:10px 16px;border-radius:999px;background:#fff3de;color:#b45b00;font-weight:700}
.hero{min-height:680px;padding:76px 7vw 90px;display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;background:radial-gradient(circle at 15% 10%,#fff1d8,transparent 28%),radial-gradient(circle at 86% 20%,#dff3ff,transparent 32%),linear-gradient(180deg,#fff,#f8fbff)}
.eyebrow{color:var(--orange);font-weight:800;letter-spacing:.06em;text-transform:uppercase}.hero h1{font-size:58px;line-height:1.08;margin:14px 0 20px;letter-spacing:-1.5px}.lead{font-size:20px;line-height:1.8;color:var(--muted);max-width:720px}.hero-actions{display:flex;gap:16px;margin:34px 0}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:14px;padding:14px 22px;font-weight:800}.btn.primary{background:linear-gradient(135deg,var(--orange),#ffb23f);color:#fff;box-shadow:0 12px 28px rgba(245,155,22,.24)}.btn.ghost{background:#fff;border:1px solid var(--line)}
.hero-stats{display:flex;gap:14px}.hero-stats div{min-width:120px;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 28px rgba(20,40,80,.06)}.hero-stats strong{display:block;font-size:24px}.hero-stats span{font-size:13px;color:var(--muted)}
.hero-card{position:relative;min-height:420px;border-radius:30px;background:linear-gradient(145deg,#152238,#263d65);box-shadow:0 30px 80px rgba(31,58,98,.28);padding:22px;overflow:hidden}.screen-top span{display:inline-block;width:12px;height:12px;border-radius:50%;background:#ff6767;margin-right:8px}.screen-top span:nth-child(2){background:#ffd166}.screen-top span:nth-child(3){background:#7bd88f}.code-card{margin-top:38px;padding:28px;border-radius:22px;background:rgba(255,255,255,.08);color:#dff3ff;font-size:20px;line-height:1.8;border:1px solid rgba(255,255,255,.12)}.floating{position:absolute;padding:12px 18px;border-radius:16px;background:#fff;font-weight:900;box-shadow:0 18px 36px rgba(0,0,0,.16)}.badge-one{right:44px;top:78px;color:var(--orange)}.badge-two{left:38px;bottom:48px;color:var(--blue)}.badge-three{right:70px;bottom:78px;color:var(--green)}
.section{padding:84px 7vw}.section.soft{background:var(--bg)}.section-head{max-width:820px;margin-bottom:34px}.section h2{font-size:40px;margin:10px 0 12px}.section-head p,.section>p{color:var(--muted);line-height:1.8}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.course-grid article,.resource-grid article{background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:0 10px 28px rgba(20,40,80,.05)}.course-grid span,.tag{display:inline-block;color:#fff;background:var(--blue);border-radius:999px;padding:6px 12px;font-size:13px;font-weight:800}.course-grid h3,.resource-grid h3{font-size:23px;margin:16px 0 10px}.course-grid p,.resource-grid p{color:var(--muted);line-height:1.7}.program-list{display:grid;gap:16px}.program-list div{display:flex;justify-content:space-between;gap:20px;padding:22px 26px;border:1px solid var(--line);border-radius:20px;background:#fff}.program-list span{color:var(--muted)}
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.work-card{min-height:220px;border-radius:26px;color:#fff;padding:26px;font-size:26px;font-weight:900;display:flex;align-items:flex-end;background:linear-gradient(135deg,#1e88e5,#8bc53f)}.work-card.robot{background:linear-gradient(135deg,#f59b16,#ef4444)}.work-card.code{background:linear-gradient(135deg,#172033,#1e88e5)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;background:#fff8ed}.panel-preview{background:#fff;border-radius:26px;border:1px solid var(--line);padding:24px;box-shadow:0 16px 40px rgba(245,155,22,.1)}.preview-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:18px 0}.preview-row:last-child{border-bottom:0}.contact{display:grid;grid-template-columns:1fr 1fr;gap:28px}.contact-card{background:#102033;color:#fff;border-radius:24px;padding:28px}.footer{display:flex;justify-content:space-between;gap:20px;padding:26px 7vw;background:#111827;color:#cbd5e1;font-size:14px}
.typing-entry{background:linear-gradient(135deg,#fff8ed,#eef8ff)}.typing-entry-card{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:30px;border:1px solid var(--line);border-radius:28px;background:#fff;box-shadow:0 18px 44px rgba(30,136,229,.1)}.typing-entry-card h3{font-size:30px;margin:14px 0 10px}.typing-entry-card p{color:var(--muted);line-height:1.8;max-width:760px}.resource-link{display:inline-flex;align-items:center;justify-content:center;border-radius:12px;padding:12px 16px;font-weight:800;background:var(--orange);color:#fff}
.install-app-button{position:fixed;right:22px;bottom:22px;z-index:99;border:0;border-radius:999px;padding:13px 18px;background:linear-gradient(135deg,var(--orange),#ffb23f);color:#fff;font-weight:900;box-shadow:0 16px 34px rgba(245,155,22,.28);cursor:pointer}
.teacher-page{background:#f4f7fb}.teacher-shell{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.teacher-side{background:#101828;color:#d0d5dd;padding:24px;display:flex;flex-direction:column;gap:10px}.teacher-side img{width:160px;background:#fff;border-radius:14px;margin-bottom:24px}.teacher-side a{padding:12px 14px;border-radius:12px}.teacher-side a.active,.teacher-side a:hover{background:#1d2939;color:#fff}.teacher-main{padding:38px}.login-demo{display:grid;grid-template-columns:1fr 320px;gap:24px;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:26px;padding:28px;margin-bottom:22px}.login-box{display:grid;gap:12px}.login-box input,.resource-toolbar input,.resource-toolbar select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px}.login-box button,.resource-toolbar button,.resource-grid button{border:0;border-radius:12px;padding:12px 16px;font-weight:800;background:var(--orange);color:#fff}.resource-toolbar{display:grid;grid-template-columns:1fr 190px 120px;gap:12px;margin-bottom:20px}.resource-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.tag{background:var(--green)}
@media (max-width:900px){.nav{display:none}.hero,.course-grid,.works-grid,.split,.contact,.login-demo,.resource-grid{grid-template-columns:1fr}.typing-entry-card{display:block}.typing-entry-card .btn{margin-top:18px}.hero h1{font-size:42px}.teacher-shell{grid-template-columns:1fr}.teacher-side{position:relative}.resource-toolbar{grid-template-columns:1fr}.footer{flex-direction:column}.program-list div{display:block}.brand img{height:44px}}

.admin-app{min-width:0}.admin-topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:24px}.admin-topbar h1{margin:4px 0 0;font-size:30px}.admin-topbar input{width:min(420px,45vw);padding:13px 16px;border:1px solid var(--line);border-radius:16px;background:#fff;font-size:15px}.admin-page{display:none}.admin-page.active{display:block}.admin-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:18px}.admin-stats div{display:flex;align-items:center;gap:14px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 10px 28px rgba(20,40,80,.05)}.admin-stats span{color:var(--muted);font-size:14px}.admin-stats strong{font-size:30px}.admin-grid.two{display:grid;grid-template-columns:1.4fr .8fr;gap:18px}.admin-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:0 12px 32px rgba(20,40,80,.06);margin-bottom:18px}.admin-card h2{margin:0 0 18px;font-size:24px}.admin-card-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:16px}.admin-card-head h2{margin:0}.admin-card-head button,.admin-form-grid button,.quick-grid button,.quick-grid a,.mini{border:0;border-radius:12px;padding:11px 15px;font-weight:800;background:var(--green);color:#fff;cursor:pointer}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.quick-grid button,.quick-grid a{min-height:82px;display:flex;align-items:center;justify-content:center;text-align:center;background:#f4fbf2;color:#42751f;border:1px solid #d8efc7}.todo-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}.todo-list li{display:flex;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:14px;background:#f8fafc;color:#475467}.todo-list strong{color:var(--orange)}.admin-form-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-bottom:16px}.admin-form-grid input,.admin-form-grid select{width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:12px;background:#fff}.admin-table-wrap{overflow:auto;border:1px solid var(--line);border-radius:16px}.admin-table-wrap table{width:100%;border-collapse:collapse;background:#fff;min-width:760px}.admin-table-wrap th,.admin-table-wrap td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.admin-table-wrap th{background:#f8fafc;color:#344054}.admin-table-wrap tr:last-child td{border-bottom:0}.mini{padding:7px 10px;font-size:13px;background:#eef4ff;color:#2764bf}.mini.danger{background:#fff1f0;color:#c2410c}.empty{text-align:center;color:var(--muted);padding:22px!important}.warn-text{color:#c2410c;font-weight:800}.muted{color:var(--muted);line-height:1.8}.schedule-demo{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.schedule-demo div{padding:18px;border-radius:16px;background:#f8fafc;border:1px solid var(--line)}.schedule-demo strong{display:block;margin-bottom:8px}.schedule-demo span{color:var(--muted)}
@media (max-width:1100px){.admin-stats,.admin-grid.two,.quick-grid,.schedule-demo{grid-template-columns:1fr 1fr}.admin-form-grid{grid-template-columns:1fr 1fr}.admin-topbar{align-items:flex-start;flex-direction:column}.admin-topbar input{width:100%}}@media (max-width:700px){.admin-stats,.admin-grid.two,.quick-grid,.schedule-demo,.admin-form-grid{grid-template-columns:1fr}.teacher-main{padding:20px}.admin-topbar h1{font-size:24px}}