:root{
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #14161a;
  --muted: #5b616b;
  --border: #d8dde6;
  --shadow: 0 10px 30px rgba(0,0,0,.06);
  --focus: #0b66ff;

  --btn: #2f6bff;
  --btnText: #ffffff;
  --btnGhostBg: transparent;

  --chip: #eef1f6;
  --dangerBg: #ffe7e7;
  --dangerBorder: #ff8a8a;
}

:root[data-theme="dark"]{
  --bg: #0f1216;
  --card: #171b21;
  --text: #e7ebf2;
  --muted: #a0a7b3;
  --border: #2a303b;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --focus: #79a7ff;

  --btn: #6ea3ff;
  --btnText: #08111f;
  --btnGhostBg: transparent;

  --chip: #232a36;
  --dangerBg: #2a1212;
  --dangerBorder: #a84a4a;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.35;
}

.skip-link{
  position: absolute;
  left: -9999px;
  top: 10px;
  padding: 10px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 10;
}
.skip-link:focus{ left: 12px; outline: none; border-color: var(--focus); box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent); }

.topbar{
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border);
  padding: 14px 18px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.logo{
  width: 70px;
  height: auto;
  border-radius: 90px;
  display: grid;
  place-items: center;
  display: block;
}
.container{
  width: min(1100px, 92vw);
  margin: 22px auto 40px;
}

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.h1{
  margin: 2px 0 6px;
  font-size: 1.25rem;
}
.h2{
  margin: 0 0 12px;
  font-size: 1.05rem;
}
.muted{ color: var(--muted); }

.grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
  margin-top: 14px;
}

.field{ min-width: 0; }
.label{
  display: inline-block;
  margin-bottom: 6px;
  font-weight: 650;
  font-size: .95rem;
}

.input{
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  outline: none;
  font-size: 1rem;
}
.input:focus{
  border-color: var(--focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent);
}

.help{
  margin-top: 6px;
  font-size: .88rem;
  color: var(--muted);
}

.actions{
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.btn{
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--btn) 55%, var(--border));
  background: var(--btn);
  color: var(--btnText);
  font-weight: 700;
  cursor: pointer;
}
.btn:hover{ filter: brightness(1.03); }
.btn:focus{
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 25%, transparent);
}
.btn.ghost{
  background: var(--btnGhostBg);
  color: var(--text);
}

.alert{
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--dangerBorder);
  background: var(--dangerBg);
  color: color-mix(in srgb, var(--text) 80%, #a90000);
}

.result{
  margin-top: 16px;
  padding-top: 10px;
}
.result-grid{
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}
.kpi{
  border: 1px solid var(--border);
  background: var(--chip);
  border-radius: 14px;
  padding: 12px;
}
.kpi-label{ color: var(--muted); font-size: .9rem; }
.kpi-value{ font-weight: 820; font-size: 1.35rem; margin-top: 4px; }
.kpi-unit{ color: var(--muted); font-size: .9rem; margin-top: 2px; }

.details{
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--card) 70%, transparent);
}
details summary{
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
}
.details-body{
  margin-top: 10px;
  color: var(--muted);
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: .93rem;
}

.footer{ margin-top: 14px; padding: 0 2px; }

.theme-wrap{
  display: flex;
  gap: 10px;
  align-items: center;
}
.theme-label{ font-weight: 650; color: var(--muted); }
.theme-select{ width: auto; }

@media (max-width: 820px){
  .grid{ grid-template-columns: 1fr; }
  .result-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}