:root {
  --bg: #f2f2f2;
  --panel: #ffffff;
  --text: #161616;
  --muted: #505050;
  --border: #d0d0d0;
  --shadow: 0 10px 30px rgba(0,0,0,.08);

  --btn: #3a3a3a;
  --btn-text: #ffffff;
  --btn-ghost: transparent;
  --btn-ghost-border: #bdbdbd;

  --focus: #0b5fff;

  --chip: #e9e9e9;
  --chip-border: #cfcfcf;
  --chip-hover: #dedede;

  --kpi: #0f172a;
}

[data-theme="light"] {
  --bg: #f2f2f2;
  --panel: #ffffff;
  --text: #161616;
  --muted: #505050;
  --border: #d0d0d0;
  --shadow: 0 10px 30px rgba(0,0,0,.08);

  --btn: #3a3a3a;
  --btn-text: #ffffff;
  --btn-ghost: transparent;
  --btn-ghost-border: #bdbdbd;

  --focus: #0b5fff;

  --chip: #e9e9e9;
  --chip-border: #cfcfcf;
  --chip-hover: #dedede;

  --kpi: #0f172a;
}

[data-theme="dark"] {
  --bg: #121212;
  --panel: #1a1a1a;
  --text: #f3f3f3;
  --muted: #bdbdbd;
  --border: #333333;
  --shadow: 0 10px 30px rgba(0,0,0,.35);

  --btn: #e5e5e5;
  --btn-text: #101010;
  --btn-ghost: transparent;
  --btn-ghost-border: #4b4b4b;

  --focus: #78a6ff;

  --chip: #2a2a2a;
  --chip-border: #3b3b3b;
  --chip-hover: #333333;

  --kpi: #e5e5e5;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.skip-link {
  position: absolute;
  top: -1000px;
  left: 12px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 999;
}
.skip-link:focus { top: 12px; outline: 2px solid var(--focus); }

.topbar {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 16px;
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

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

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.theme-toggle {
  display: flex;
  gap: 10px;
  align-items: center;
}

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

select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.98rem;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px 36px 16px;
}

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

.card-secondary {
  box-shadow: none;
}

h2 {
  margin: 0 0 12px 0;
  font-size: 1.2rem;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
}

.field {
  display: grid;
  gap: 6px;
}

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

input[type="number"] {
  width: 100%;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 1rem;
}

.help {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.btn {
  border: 1px solid var(--border);
  background: var(--btn);
  color: var(--btn-text);
  border-radius: 12px;
  padding: 11px 14px;
  font-size: 1rem;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }

.btn.ghost {
  background: var(--btn-ghost);
  border: 1px solid var(--btn-ghost-border);
  color: var(--text);
}

.btn:focus,
select:focus,
input:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.result {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

.result-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}

.result-kpi {
  min-width: 240px;
}

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

.kpi-value {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 800;
  letter-spacing: 0.2px;
  color: var(--kpi);
}

.result-meta {
  flex: 1;
  min-width: 260px;
  color: var(--muted);
  font-size: 0.98rem;
}

.meta-key { color: var(--muted); }
.meta-val { color: var(--text); }

.assumptions {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px;
}

.assumptions summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 650;
}

.chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.chip {
  background: var(--chip);
  border: 1px solid var(--chip-border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
}
.chip:hover { background: var(--chip-hover); }

.quickline {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 10px;
  align-items: center;
}

.toggle {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.toggle input {
  width: 18px;
  height: 18px;
}

.range {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 12px;
  background: rgba(127,127,127,.08);
}

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

.bullets b { color: var(--text); }

.footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}