:root{
  --red:#e91824;--yellow:#ffd51f;--blue:#1f73c9;--green:#1f9d5a;--pink:#ff3b77;--orange:#ff9800;
  --ink:#15305b;--muted:#71809c;--line:#dbe5f1;--bg:#f6f9fd;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:#16233b}
button,input,select,textarea{font:inherit}
.topbar{height:78px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:12px}.brand img{height:56px;width:auto;max-width:200px;object-fit:contain;display:block}
.container{max-width:1120px;margin:0 auto;padding:28px 18px 56px}
.screen{display:none}.screen.active{display:block}
.hero{text-align:center;padding:24px 0 8px}.hero h1{font-size:38px;margin:8px 0}.hero p{color:var(--muted);max-width:760px;margin:0 auto}
.eyebrow{font-size:13px;font-weight:900;letter-spacing:.08em;color:var(--red)}
.role-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.role-card{border:0;border-radius:22px;padding:26px;text-align:left;cursor:pointer;box-shadow:0 8px 28px rgba(40,70,120,.08);transition:.2s;background:#fff}
.role-card:hover{transform:translateY(-3px)}.role-icon{font-size:48px}.role-card h3{font-size:24px;margin:12px 0 8px}.role-card p{color:var(--muted);line-height:1.5}
.teacher{background:#eaf4ff}.student{background:#fff0f5}.parent{background:#fff8df}
.panel,.success-card{background:#fff;border-radius:24px;padding:26px;box-shadow:0 10px 30px rgba(35,65,110,.08);max-width:100%;margin:0 auto}
.form-layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,.7fr);gap:20px;align-items:start}
.form-main{min-width:0}
.helper-card{background:linear-gradient(180deg,#f7fbff,#ffffff);border:1px solid var(--line);border-radius:22px;padding:20px;position:sticky;top:96px}
.helper-icon{width:56px;height:56px;border-radius:18px;background:#eef6ff;display:grid;place-items:center;font-size:28px;margin-bottom:10px}
.helper-card h3{margin:4px 0 10px;color:var(--ink);font-size:22px}
.helper-card ul{padding-left:18px;margin:0}
.helper-card li{margin:10px 0;color:#314765;line-height:1.45}
.helper-note{margin-top:14px;padding:12px 14px;border-radius:14px;background:#eef9f2;color:#127a42;font-weight:700}
.back,.ghost{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px;cursor:pointer;margin-bottom:14px}
.form-title h2{margin:8px 0 4px}.form-title p{margin:0 0 20px;color:var(--muted)}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;background:#eaf4ff;color:var(--blue);font-weight:800}
label{display:block;margin:14px 0}label span{display:block;font-weight:800;margin-bottom:8px}
input,select,textarea{width:100%;border:1px solid #cfd9e8;border-radius:12px;padding:13px 14px;background:#fff;outline:none}
input:focus,select:focus,textarea:focus{border-color:#7ea9dd;box-shadow:0 0 0 3px #eaf3ff}
.grid.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}.upload-box{border:1px dashed #aac0dc;border-radius:14px;padding:14px}.upload-box input{border:0;padding:8px 0}.upload-box small{color:var(--muted)}
.primary{width:100%;border:0;background:linear-gradient(90deg,#f01d2e,#e61322);color:#fff;font-weight:900;border-radius:14px;padding:14px 18px;cursor:pointer;margin-top:12px}.primary.small{width:auto;margin:0;padding:10px 16px}
.success-card{text-align:center;margin-top:40px;max-width:760px}.success-icon{width:74px;height:74px;border-radius:50%;display:grid;place-items:center;background:#20af69;color:#fff;font-size:42px;margin:0 auto 16px}.code-box{margin:20px auto;padding:16px;background:#fff1f3;border-radius:16px;max-width:280px}.code-box span{display:block;color:var(--muted);font-size:13px}.code-box strong{font-size:28px;color:var(--ink)}
.admin-head{display:flex;justify-content:space-between;align-items:end}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0}.stat{background:#fff;border-radius:16px;padding:16px;border:1px solid var(--line)}.stat b{font-size:28px;display:block;color:var(--blue)}.stat span{color:var(--muted);font-size:13px}
.toolbar{display:flex;gap:10px;margin:14px 0}.toolbar input{flex:1}.toolbar select{width:240px}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:16px}table{border-collapse:collapse;width:100%;min-width:900px}th,td{padding:12px 14px;border-bottom:1px solid #edf1f6;text-align:left;font-size:14px}th{background:#f8fbff;color:#50627c}.status{padding:5px 8px;border-radius:999px;font-size:12px;font-weight:800;background:#eaf4ff;color:#1f73c9}

@media(max-width:980px){
  .form-layout{grid-template-columns:1fr}
  .helper-card{position:static;order:-1;padding:14px 16px;display:grid;grid-template-columns:auto 1fr;column-gap:12px;align-items:center}
  .helper-icon{width:40px;height:40px;border-radius:12px;font-size:20px;margin:0}
  .helper-card h3{margin:0;font-size:17px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:8px}
  .helper-card h3::after{content:"▾";color:var(--muted);font-size:16px;transition:transform .2s}
  .helper-card ul,.helper-note{grid-column:1/-1}
  .helper-card ul{margin-top:8px}
  .helper-card.collapsed ul,.helper-card.collapsed .helper-note{display:none}
  .helper-card.collapsed h3::after{transform:rotate(-90deg)}
}
@media(max-width:760px){
  .role-grid,.grid.two,.stats{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .topbar{padding:0 14px}
  .toolbar{flex-direction:column}
  .toolbar select{width:100%}
  .panel,.success-card{padding:18px}
  .helper-card{padding:16px}
  .helper-card h3{font-size:20px}
  .brand img{height:46px;max-width:160px}
  .ghost{padding:9px 12px}
}