:root{
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;     /* slate-900 */
  --muted:#64748b;     /* slate-500 */
  --border:#e2e8f0;    /* slate-200 */
  --shadow: 0 18px 45px rgba(15,23,42,.08);
  --shadow2: 0 10px 22px rgba(15,23,42,.06);

  --brand:#0b1220;     /* deep navy */
  --brand2:#111827;    /* slate-900 */
  --accent:#2563eb;    /* blue-600 */

  --radius: 18px;
  --radius2: 14px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  color:var(--text);
  background:
    radial-gradient(900px 420px at 20% -10%, rgba(37,99,235,.12), transparent 55%),
    radial-gradient(780px 360px at 100% 10%, rgba(15,23,42,.10), transparent 60%),
    var(--bg);
}

/* Top bar */
.top{
  position: sticky;
  top:0;
  z-index: 50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding: 14px 14px;
  background: linear-gradient(180deg, var(--brand), var(--brand2));
  color:#fff;
  border-bottom: 1px solid rgba(255,255,255,.10);
}
.title{
  font-weight: 850;
  letter-spacing: .2px;
  font-size: 16px;
}
.sub{
  margin-top:2px;
  font-size: 12px;
  opacity: .82;
}

/* Layout */
.wrap{
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px;
}
.panel{ display:none; }
.panel.active{ display:block; }

h2{
  font-size: 18px;
  margin: 16px 0 10px;
  letter-spacing: .2px;
}
h3{
  font-size: 13px;
  color: var(--muted);
  margin: 18px 0 10px;
  font-weight: 800;
  letter-spacing: .3px;
  text-transform: uppercase;
}

/* Tabs */
.tabs{
  position: sticky;
  top: 56px;
  z-index: 40;
  display:flex;
  gap:8px;
  overflow:auto;
  padding: 10px 12px;
  background: rgba(246,247,251,.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.tab{
  flex: 0 0 auto;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.75);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 999px;
  cursor:pointer;
  font-weight: 800;
  font-size: 13px;
  white-space: nowrap;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.tab:hover{ border-color:#cbd5e1; }
.tab:active{ transform: translateY(1px); }
.tab.active{
  background: rgba(15,23,42,.92);
  border-color: rgba(15,23,42,.92);
  color:#fff;
}

/* Buttons */
.btn{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.9);
  padding: 10px 12px;
  border-radius: var(--radius2);
  cursor:pointer;
  font-weight: 850;
  font-size: 13px;
  box-shadow: var(--shadow2);
  transition: transform .08s ease, border-color .15s ease, background .15s ease;
}
.btn:hover{ border-color:#cbd5e1; }
.btn:active{ transform: translateY(1px); }
.btn.primary{
  background: linear-gradient(180deg, rgba(37,99,235,1), rgba(29,78,216,1));
  border-color: rgba(29,78,216,1);
  color:#fff;
  box-shadow: 0 16px 32px rgba(37,99,235,.18);
}

/* Cards + forms */
.form, .card{
  background: rgba(255,255,255,.9);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.form{ padding: 14px; }
.card{ padding: 14px; }

.cards{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 12px;
}

/* Inputs */
label{
  display:flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 800;
}
input, select, textarea{
  width: 100%;
  padding: 11px 12px;
  border-radius: var(--radius2);
  border: 1px solid var(--border);
  font-size: 14px;
  outline: none;
  background: #fff;
  color: var(--text);
  transition: box-shadow .15s ease, border-color .15s ease;
}
input:focus, select:focus, textarea:focus{
  border-color: rgba(37,99,235,.65);
  box-shadow: 0 0 0 4px rgba(37,99,235,.15);
}

.grid{
  display:grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0,1fr));
}
@media (max-width: 760px){
  .grid{ grid-template-columns: 1fr; }
  .tabs{ top: 58px; }
}

/* Text blocks */
.hint{
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}
.pre{
  background: rgba(15,23,42,.95);
  color:#fff;
  padding: 14px;
  border-radius: var(--radius);
  overflow:auto;
  box-shadow: var(--shadow);
}
.row{
  display:flex;
  gap: 10px;
  align-items:center;
  flex-wrap: wrap;
}