:root{
  /* Palette */
  --bg0:#0b0d12;
  --bg1:#0f121a;

  --card:#141824;
  --card-hi: rgba(255,255,255,.05);
  --border: rgba(255,255,255,.10);
  --border-strong: rgba(255,255,255,.14);

  --text:#e9edf6;
  --muted:#a7b1c4;
  --muted2:#8b95aa;

  --accent:#6aa3ff;
  --accent2:#7c5cff;

  --good:#31d09c;
  --warn:#ffcc66;
  --bad:#ff5d6c;

  /* UI */
  --radius:16px;
  --radius-sm:12px;
  --shadow: 0 10px 28px rgba(0,0,0,.35);
  --shadow-soft: 0 6px 18px rgba(0,0,0,.22);

  /* Spacing */
  --gap:14px;
  --pad:16px;

  /* Typography */
  --fs-1: 18px;
  --fs-2: 16px;
  --fs-3: 14px;
  --fs-4: 12px;

  /* Tell browsers we are dark UI (helps select/inputs on some engines) */
  color-scheme: dark;
}

*{ box-sizing:border-box; }
html, body{ height:100%; }
html{ -webkit-text-size-adjust: 100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);

  /* Light "sfumature" but stable */
  background:
    radial-gradient(900px 520px at 10% -10%, rgba(106,163,255,.16), transparent 55%),
    radial-gradient(860px 520px at 110% 0%, rgba(124,92,255,.12), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;

  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container{
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

/* Topbar */
.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11,13,18,.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.brand{
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 16px;
  display:flex;
  align-items:center;
  gap: 12px;
}

.logo{
  width: 42px;
  height: 42px;
  display:grid;
  place-items:center;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  box-shadow: var(--shadow-soft);
  color: var(--accent);
  font-weight: 800;
}

.titles h1{
  margin:0;
  font-size: var(--fs-1);
  letter-spacing: .2px;
}
.titles p{
  margin: 3px 0 0;
  color: var(--muted);
  font-size: var(--fs-4);
  line-height: 1.35;
}

/* Grid */
.grid{
  margin-top: var(--gap);
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap);
}

/* Cards */
.card{
  grid-column: span 12;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  padding: var(--pad);
  overflow: hidden;
  position: relative;
}

/* subtle top glow */
.card::before{
  content:"";
  position:absolute;
  inset: 0;
  pointer-events:none;
  background: radial-gradient(900px 240px at 10% 0%, rgba(106,163,255,.10), transparent 55%);
  opacity:.9;
}

.card > *{ position: relative; }

.card h2{
  margin:0 0 10px;
  font-size: var(--fs-2);
  letter-spacing: .15px;
}

.card h3{
  margin: 14px 0 8px;
  font-size: var(--fs-3);
  color: #d7deee;
}

/* Text */
.muted{
  color: var(--muted);
  font-size: var(--fs-4);
  line-height: 1.45;
}

.muted2, small{
  color: var(--muted2);
  font-size: var(--fs-4);
}

code{
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  padding: 2px 7px;
  border-radius: 9px;
  font-size: .95em;
}

/* Form rows (responsive) */
.row{
  display:flex;
  gap: 10px;
  align-items: center;
  margin: 10px 0;
  flex-wrap: wrap; /* key for mobile */
}

.row > *{
  flex: 1 1 220px;
  min-width: 0;
}

.label{
  flex: 0 0 110px;
  color: var(--muted);
  font-size: var(--fs-4);
}

/* Inputs & selects */
input, select{
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;

  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.12);
  color: var(--text);
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  outline: none;

  box-shadow: 0 1px 0 rgba(255,255,255,.06) inset;
}

input::placeholder{
  color: rgba(167,177,196,.65);
}

/* Ensure text isn't "washed" in Safari/Chrome */
input, select{
  -webkit-text-fill-color: var(--text);
}

/* Dropdown menu items (where supported) */
select option{
  background-color: #141824;
  color: #e9edf6;
}

select optgroup{
  background-color: #101420;
  color: #e9edf6;
}

input:focus, select:focus{
  border-color: rgba(106,163,255,.55);
  box-shadow:
    0 0 0 3px rgba(106,163,255,.18),
    0 1px 0 rgba(255,255,255,.08) inset;
}

/* Make select show a subtle chevron without breaking native UI too much */
select{
  padding-right: 38px;
  background-image:
    linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02)),
    radial-gradient(circle at 70% 50%, rgba(255,255,255,.35) 0 2px, transparent 3px),
    radial-gradient(circle at 70% 50%, rgba(255,255,255,.35) 0 2px, transparent 3px);
  background-repeat: no-repeat;
  background-position:
    0 0,
    calc(100% - 18px) 46%,
    calc(100% - 12px) 54%;
  background-size:
    100% 100%,
    6px 6px,
    6px 6px;
}

/* Buttons */
button{
  cursor: pointer;
  user-select: none;
  border: 1px solid rgba(255,255,255,.12);
  background: linear-gradient(180deg, rgba(106,163,255,.22), rgba(106,163,255,.14));
  color: var(--text);
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  letter-spacing: .1px;
  box-shadow: 0 10px 24px rgba(0,0,0,.25);
  transition: transform .06s ease, filter .18s ease, border-color .18s ease;
}

button:hover{ filter: brightness(1.07); }
button:active{ transform: translateY(1px); }

button.ghost{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 8px 18px rgba(0,0,0,.18);
}

/* Results */
.result{
  margin-top: 10px;
  padding: 12px;
  border-radius: 14px;
  border: 1px dashed rgba(255,255,255,.18);
  background: linear-gradient(180deg, rgba(0,0,0,.18), rgba(0,0,0,.12));
  min-height: 44px;
  color: #dfe6f3;
  word-break: break-word;
}

.result .err{ color: var(--bad); }
.result .ok{ color: var(--good); }
.result .warn{ color: var(--warn); }

/* Separators */
.sep{
  border: none;
  border-top: 1px solid rgba(255,255,255,.10);
  margin: 14px 0;
}

/* Footer */
.footer{
  margin-top: 14px;
  text-align: center;
}

/* Desktop grid */
@media (min-width: 920px){
  .grid > .card{ grid-column: span 6; }
}

/* Mobile polish */
@media (max-width: 520px){
  :root{
    --pad: 14px;
    --gap: 12px;
  }

  .brand{
    padding: 12px 14px;
  }

  .logo{
    width: 40px;
    height: 40px;
  }

  .titles h1{
    font-size: 16px;
  }

  .titles p{
    font-size: 12px;
  }

  .label{
    flex: 1 1 100%;
    margin-bottom: -4px;
  }

  .row{
    gap: 8px;
  }

  .row > *{
    flex: 1 1 100%;
  }

  button{
    width: 100%;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ transition:none !important; }
}