:root{
  --bg:#070707;
  --panel: rgba(255,255,255,0.06);
  --panel2: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.65);
  --stroke: rgba(255,255,255,0.12);
  --shadow: 0 10px 30px rgba(0,0,0,0.55);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 20% 0%, rgba(255,255,255,0.08), transparent 60%),
              radial-gradient(900px 600px at 80% 20%, rgba(255,255,255,0.06), transparent 55%),
              var(--bg);
  color: var(--text);
}

.container{ max-width: 1100px; margin:0 auto; padding: 18px; }

.topbar{
  position: sticky;
  top:0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(0,0,0,0.55);
  border-bottom: 1px solid var(--stroke);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
  padding: 14px 18px;
}

.brand{ display:flex; align-items:center; gap: 12px; }
.brand-mark{
  position:relative;
  font-weight: 900;
  letter-spacing: 0.02em;
  font-size: 18px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--stroke);
}
.tm{
  font-size: 12px;
  opacity: 0.9;
  position:absolute;
  right: 6px;
  top: 4px;
}
.brand-text{ display:flex; flex-direction:column; }
.kicker{ font-size: 12px; letter-spacing: 0.12em; color: var(--muted); text-transform: uppercase; }
h1{ margin: 2px 0 0; font-size: 16px; font-weight: 700; }

.top-actions{ display:flex; gap: 10px; align-items:center; }

.hero{ padding: 20px 0 6px; }
.hero-card{
  background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.05));
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.hero-card h2{ margin: 0 0 8px; font-size: 28px; }
.hero-card p{ margin: 0 0 14px; color: var(--muted); line-height:1.5; }
.hero-actions{ display:flex; gap: 10px; flex-wrap: wrap; }
.mini{ margin-top: 10px; color: var(--muted); font-size: 13px; min-height: 18px; }

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.14);
  color: var(--text);
  text-decoration:none;
  font-weight: 650;
  cursor:pointer;
}
.btn:hover{ background: rgba(255,255,255,0.18); }
.btn-ghost{
  background: transparent;
  border: 1px solid rgba(255,255,255,0.18);
}
.btn-ghost:hover{ background: rgba(255,255,255,0.08); }
.btn-small{ padding: 9px 12px; border-radius: 12px; font-size: 13px; }

.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0 18px;
}
@media (max-width: 900px){
  .grid{ grid-template-columns: 1fr; }
  .span-2{ grid-column: auto; }
}
.card{
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.span-2{ grid-column: span 2; }

.card-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  margin-bottom: 10px;
}
h3{ margin:0; font-size: 16px; }

.code{
  margin:0;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.35);
  color: rgba(255,255,255,0.88);
  overflow:auto;
  white-space: pre-wrap;
  line-height: 1.45;
  font-size: 13px;
}

.content{
  color: var(--muted);
  line-height: 1.55;
  font-size: 14px;
}
.content ul{ margin: 10px 0 0; padding-left: 18px; }
.content li{ margin: 6px 0; }

.list{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.55;
}
.list li{ margin: 8px 0; }

.footer{ padding: 10px 0 18px; text-align:center; }
.small{ font-size: 13px; color: var(--muted); }
.muted{ color: var(--muted); }

.roleplay-steps{
  margin-top: 14px;
  display:flex;
  flex-direction:column;
  gap: 12px;
}
.step{
  display:flex;
  gap: 12px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.22);
}
.step-num{
  width: 34px;
  height: 34px;
  border-radius: 12px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight: 800;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.14);
}
.step-body{ flex:1; }
.step-title{
  font-weight: 750;
  margin-bottom: 4px;
  color: rgba(255,255,255,0.92);
}
.step-desc{
  color: rgba(255,255,255,0.65);
  font-size: 13px;
  line-height: 1.45;
  margin-bottom: 10px;
}
.step-actions{
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
}

.teacher-toggle{
  margin: 10px 0 6px;
  display:flex;
  gap:12px;
  align-items:center;
}
.teacher-view.hidden{
  display:none;
}


.hidden{ display:none; }

.form-grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
@media (max-width: 700px){
  .form-grid{ grid-template-columns: 1fr; }
}
.field{
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.field span{
  font-size: 13px;
  color: rgba(255,255,255,0.75);
}
.field input, .field textarea{
  width:100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.28);
  color: rgba(255,255,255,0.92);
  outline:none;
}
.field input:focus, .field textarea:focus{
  border-color: rgba(255,255,255,0.26);
}

/* Copy modal (Safari-proof fallback) */
.modal{ position: fixed; inset: 0; z-index: 9999; display:flex; align-items:center; justify-content:center; padding: 18px; }
.modal.hidden{ display:none; }
.modal-backdrop{ position:absolute; inset:0; background: rgba(0,0,0,0.72); }
.modal-card{
  position:relative;
  width: min(860px, 96vw);
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(10,10,10,0.95);
  box-shadow: 0 18px 60px rgba(0,0,0,0.7);
  padding: 16px;
}
.modal-head{ display:flex; align-items:flex-start; justify-content:space-between; gap: 12px; }
.modal-title{ font-size: 18px; font-weight: 800; margin-top: 2px; }
.modal-help{ color: rgba(255,255,255,0.7); margin: 10px 0 10px; line-height: 1.45; }
.modal-text{
  width:100%;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.45);
  color: rgba(255,255,255,0.92);
  padding: 14px;
  outline:none;
  resize: vertical;
  line-height: 1.45;
  font-size: 13px;
}
.modal-actions{ margin-top: 12px; display:flex; gap: 10px; flex-wrap: wrap; }