:root {
  --bg: #f2f2f2;
  --panel: #ffffffcc;
  --panel-solid: #ffffff;
  --text: #151515;
  --muted: #4f4f4f;
  --border: #d9d9d9;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);

  --primary: #3a7bd5;
  --primary-2: #2f6ebf;

  --field-bg: #ffffff;
  --field-border: #d6d6d6;

  --focus: rgba(58, 123, 213, 0.28);

  --chip: #e9e9e9;
  --danger: #b42318;
}

[data-theme="dark"]{
  --bg: #121212;
  --panel: rgba(22,22,22,0.75);
  --panel-solid: #181818;
  --text: #f2f2f2;
  --muted: #b9b9b9;
  --border: #2b2b2b;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);

  --primary: #6aa9ff;
  --primary-2: #4f95ff;

  --field-bg: #141414;
  --field-border: #2f2f2f;

  --focus: rgba(106, 169, 255, 0.26);

  --chip: #262626;
}

* { 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: radial-gradient(1200px 600px at 20% -10%, rgba(58,123,213,0.12), transparent 60%),
              radial-gradient(900px 500px at 100% 0%, rgba(58,123,213,0.10), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: linear-gradient(to bottom, rgba(255,255,255,0.35), rgba(255,255,255,0.15));
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .topbar{
  background: linear-gradient(to bottom, rgba(0,0,0,0.35), rgba(0,0,0,0.15));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
}

.logo{
  width: 70px;
  height: auto;
  border-radius: 90px;
  display: grid;
  place-items: center;
  display: block;
}

.container{
  max-width: 980px;
  margin: 22px auto 40px;
  padding: 0 14px;
  display: grid;
  gap: 14px;
}

.card{
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 14px;
  padding: 16px;
}

.card--small{
  padding: 16px;
}

h2{
  margin: 0 0 12px;
  font-size: 1.15rem;
}
h3{
  margin: 14px 0 10px;
  font-size: 1.05rem;
  color: var(--text);
}

.form-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: start;
}

@media (max-width: 860px){
  .form-grid{
    grid-template-columns: 1fr;
  }
  .theme-controls{
    display: none;
  }
}

.field label{
  display: block;
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.field input,
.field select{
  width: 100%;
  border: 1px solid var(--field-border);
  background: var(--field-bg);
  color: var(--text);
  padding: 11px 12px;
  border-radius: 10px;
  outline: none;
  font-size: 1rem;
}

.field input:focus,
.field select:focus{
  box-shadow: 0 0 0 4px var(--focus);
  border-color: transparent;
}

.field--half{
  grid-column: span 1;
}

.inline-label{
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

.radio-row{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.radio{
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.98rem;
  user-select: none;
}

.actions{
  grid-column: span 2;
  display: flex;
  gap: 10px;
  margin-top: 6px;
}
@media (max-width: 860px){
  .actions{ grid-column: span 1; }
}

.btn{
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 11px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 650;
}
.btn:hover{
  background: var(--chip);
}
.btn:focus{
  outline: none;
  box-shadow: 0 0 0 4px var(--focus);
  border-color: transparent;
}
.btn.primary{
  border-color: transparent;
  background: linear-gradient(180deg, var(--primary), var(--primary-2));
  color: white;
}

.theme-controls{
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-label{
  color: var(--muted);
  font-size: 0.95rem;
}

.segmented{
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--panel);
}

.seg-btn{
  border: 0;
  padding: 10px 12px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
}
.seg-btn:hover{
  background: var(--chip);
}
.seg-btn[aria-pressed="true"]{
  color: var(--text);
  background: rgba(58,123,213,0.14);
}

.result-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: stretch;
}

@media (max-width: 720px){
  .result-grid{
    grid-template-columns: 1fr;
  }
  .theme-controls{
    display: none;
  }
}

.result{
  border: 1px solid var(--border);
  background: var(--panel-solid);
  border-radius: 12px;
  padding: 14px;
}

.result-label{
  color: var(--muted);
  font-weight: 650;
  font-size: 0.95rem;
}
.result-value{
  margin-top: 8px;
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0.2px;
}

.hint{
  grid-column: span 2;
  border: 1px solid var(--border);
  background: var(--panel-solid);
  border-radius: 12px;
  padding: 12px 14px;
}
@media (max-width: 720px){
  .hint{ grid-column: span 1; }
}
.hint-title{
  font-weight: 900;
  margin-bottom: 6px;
}
.hint-text{
  margin: 0;
  color: var(--muted);
}

.divider{
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}

.table-wrap{
  overflow: auto;
}

.table{
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.table th, .table td{
  border-bottom: 1px solid var(--border);
  padding: 10px 10px;
  text-align: left;
  vertical-align: top;
}

.table th{
  color: var(--muted);
  font-weight: 750;
  font-size: 0.95rem;
}
.table td{
  font-weight: 650;
}

.table td:nth-child(2){
  font-weight: 850;
}

.bullets{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}