/* Shared styles for sathvickollu.com /tools/* mini-apps. Keep small and self-contained. */
:root{
  --bg:#0b1220;
  --surface:#131c2e;
  --surface-soft:#1a2540;
  --surface-strong:#0f1827;
  --text:#e5edf7;
  --muted:#9aa8c1;
  --teal:#2a8a8a;
  --teal-bright:#4fb3b3;
  --teal-soft:rgba(42,138,138,0.18);
  --teal-line:rgba(42,138,138,0.45);
  --amber:#facc15;
  --danger:#e26d6d;
  --success:#34d399;
  --border:rgba(255,255,255,0.08);
  --border-strong:rgba(255,255,255,0.18);
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--text);
  font:16px/1.55 "Inter",system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;
}
a{color:var(--teal-bright);text-decoration:none}
a:hover{text-decoration:underline}
.topbar{background:rgba(255,255,255,0.02);border-bottom:1px solid var(--border)}
.topbar-inner{align-items:center;display:flex;gap:18px;justify-content:space-between;margin:0 auto;max-width:1080px;padding:14px 20px}
.topbar a.brand{color:var(--text);font-weight:600}
.topbar a.back{color:var(--muted);font-size:0.92rem}
.topbar a.back:hover{color:var(--text);text-decoration:none}
main{margin:0 auto;max-width:1080px;padding:32px 20px 80px}
.hero{margin-bottom:32px}
.hero h1{font-size:2.1rem;margin:0 0 10px}
.hero p{color:var(--muted);font-size:1.05rem;margin:0;max-width:760px}
.surface{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px}
.row{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.row.three{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
label.field{display:flex;flex-direction:column;font-weight:600;gap:6px}
label.field span{color:var(--muted);font-size:0.92rem;font-weight:500}
input[type="text"],input[type="number"],input[type="date"],textarea,select{
  background:var(--surface-soft);
  border:1px solid var(--border);
  border-radius:10px;
  color:var(--text);
  font:inherit;
  padding:10px 12px;
  width:100%;
}
input:focus,textarea:focus,select:focus{
  border-color:var(--teal-line);outline:2px solid var(--teal-soft);outline-offset:0;
}
textarea{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,monospace;font-size:0.94rem;min-height:120px;resize:vertical}
button,.btn{
  background:var(--teal);border:none;border-radius:10px;color:#fff;cursor:pointer;
  font:600 0.98rem "Inter",sans-serif;padding:11px 22px;text-decoration:none;
  display:inline-flex;align-items:center;gap:8px;
}
button:hover,.btn:hover{filter:brightness(1.1)}
.btn.ghost{background:transparent;border:1px solid var(--border-strong);color:var(--text)}
.btn.ghost:hover{border-color:var(--teal-line);color:var(--teal-bright)}
.btn.danger{background:transparent;border:1px solid rgba(226,109,109,0.4);color:var(--danger)}
.btn.danger:hover{background:rgba(226,109,109,0.1)}
.btn.small{font-size:0.85rem;padding:8px 14px}
.btns{display:flex;flex-wrap:wrap;gap:10px}
.tag{background:var(--teal-soft);border:1px solid var(--teal-line);border-radius:999px;color:var(--teal-bright);display:inline-block;font-size:0.78rem;font-weight:600;letter-spacing:0.08em;padding:4px 12px;text-transform:uppercase}
.muted{color:var(--muted)}
.section-title{font-size:1.4rem;margin:8px 0 12px}
.section-divider{border-top:1px solid var(--border);margin:32px 0 24px}
.kpi{align-items:baseline;display:flex;gap:8px}
.kpi .val{font-size:1.6rem;font-weight:700}
.kpi .lbl{color:var(--muted);font-size:0.88rem}
.callout{
  background:var(--teal-soft);border-left:4px solid var(--teal);border-radius:10px;
  margin-bottom:24px;padding:16px 20px;
}
.warn{color:var(--danger)}
.success{color:var(--success)}
table.data{border-collapse:collapse;width:100%}
table.data th,table.data td{border-bottom:1px solid var(--border);padding:10px 8px;text-align:left;vertical-align:top}
table.data th{color:var(--muted);font-size:0.82rem;font-weight:600;letter-spacing:0.06em;text-transform:uppercase}
table.data tr:last-child td{border-bottom:0}
table.data input,table.data select,table.data textarea{background:transparent;border:1px solid var(--border);border-radius:6px;padding:6px 8px}
table.data input:focus,table.data select:focus,table.data textarea:focus{border-color:var(--teal-line)}
.tabs{border-bottom:1px solid var(--border);display:flex;gap:8px;margin-bottom:18px}
.tabs button{background:transparent;border:none;border-bottom:2px solid transparent;border-radius:0;color:var(--muted);padding:10px 14px;font-weight:600}
.tabs button.active{border-bottom-color:var(--teal);color:var(--text)}
.tabs button:hover{color:var(--text)}
.tab-panel{display:none}
.tab-panel.active{display:block}
footer.page{border-top:1px solid var(--border);color:var(--muted);margin-top:48px;padding-top:18px}
footer.page a{color:var(--teal-bright)}
.copied{color:var(--success);font-size:0.85rem;margin-left:8px}
details summary{cursor:pointer;font-weight:600;margin-top:24px}
details > div{color:var(--muted);padding:12px 0 0}
.notice{background:rgba(250,204,21,0.08);border-left:4px solid var(--amber);border-radius:8px;color:var(--text);font-size:0.92rem;margin-bottom:18px;padding:10px 14px}
.related{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:24px}
.related a{background:var(--surface);border:1px solid var(--border);border-radius:12px;color:var(--text);display:block;padding:16px;text-decoration:none}
.related a:hover{border-color:var(--teal-line)}
.related a .name{font-weight:600;margin-bottom:4px}
.related a .desc{color:var(--muted);font-size:0.88rem}
@media (max-width:540px){
  .hero h1{font-size:1.6rem}
  main{padding:20px 16px 60px}
}