:root {
  --bg: #f5f7fb;
  --bg-gradient-start: #eef2ff;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --success: #15803d;
  --danger: #b91c1c;
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
  --input-bg: #ffffff;
  --subtle-bg: #fafafa;
  --table-head-bg: #f8fafc;
  --button-secondary: #374151;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1220;
    --bg-gradient-start: #172554;
    --card: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --primary: #60a5fa;
    --success: #4ade80;
    --danger: #f87171;
    --border: #253043;
    --shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
    --input-bg: #0f172a;
    --subtle-bg: #0f172a;
    --table-head-bg: #111827;
    --button-secondary: #475569;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --bg-gradient-start: #172554;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #60a5fa;
  --success: #4ade80;
  --danger: #f87171;
  --border: #253043;
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  --input-bg: #0f172a;
  --subtle-bg: #0f172a;
  --table-head-bg: #111827;
  --button-secondary: #475569;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg) 30%);
}

.container {
  max-width: 1280px;
  margin: 1rem auto 2rem;
  padding: 0 0.9rem;
}

header {
  margin-bottom: 1.25rem;
}

.theme-control {
  margin-top: 0.9rem;
  position: relative;
  isolation: isolate;
  display: inline-grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--subtle-bg);
  padding: 2px;
  overflow: hidden;
}

.theme-control::before,
.theme-control::after {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 1.2rem;
  background: var(--border);
  opacity: 0.9;
  z-index: 0;
  pointer-events: none;
}

.theme-control::before {
  left: calc(33.333% - 0.5px);
}

.theme-control::after {
  left: calc(66.666% - 0.5px);
}

.theme-btn {
  appearance: none;
  position: relative;
  z-index: 1;
  border: none;
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
}

.theme-btn + .theme-btn {
  position: relative;
}

.theme-btn.active {
  z-index: 2;
  background: var(--card);
  color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}

.app-layout {
  display: grid;
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.sidepanel {
  position: sticky;
  top: 0.75rem;
  max-height: calc(100vh - 1.5rem);
  overflow: auto;
}

.content-area {
  min-width: 0;
}

h1,
h2,
h3 {
  margin: 0 0 0.5rem;
}

p {
  margin: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  gap: 0.75rem;
}

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.one-col {
  grid-template-columns: 1fr;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.95rem;
}

input,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  font-size: 1rem;
  background: var(--input-bg);
  color: var(--text);
}

input:focus,
select:focus {
  outline: 2px solid rgba(37, 99, 235, 0.3);
  border-color: var(--primary);
}

.fieldset {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem;
}

.fieldset legend {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0 0.4rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.checkbox-row input {
  width: auto;
}

.hidden {
  display: none;
}

.children-list {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.child-row {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  background: var(--subtle-bg);
}

.child-row .removeChildBtn {
  justify-self: start;
}

button {
  appearance: none;
  border: none;
  background: var(--primary);
  color: white;
  font-weight: 600;
  border-radius: 10px;
  padding: 0.65rem 0.95rem;
  cursor: pointer;
}

button.secondary {
  background: var(--button-secondary);
}

button.danger {
  background: var(--danger);
}

.actions {
  margin-top: 1rem;
}

.actions button {
  width: 100%;
}

.hint,
small {
  color: var(--muted);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.overview-row {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-bottom: 1rem;
}

.intro-card {
  flex: 1 1 auto;
  margin-bottom: 0;
}

.theme-panel {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  margin-bottom: 0;
  width: fit-content;
}

.theme-panel .theme-control {
  margin-top: 0;
}

.matrix-wrapper {
  margin-top: 0.85rem;
  overflow-x: auto;
}

.chart-wrap {
  margin-top: 0.75rem;
  height: 340px;
}

.chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.matrix-table th,
.matrix-table td {
  border: 1px solid var(--border);
  padding: 0.55rem;
  vertical-align: top;
  text-align: left;
}

.matrix-table th {
  background: var(--table-head-bg);
  font-size: 0.9rem;
}

.matrix-cell-main {
  font-weight: 700;
  line-height: 1.2;
}

.matrix-cell-sub {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.25;
  margin-top: 0.15rem;
}

.results-grid article {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
}

.result-number {
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0.35rem 0 0.45rem;
}

.breakdown {
  margin-top: 0.9rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9rem;
  display: grid;
  gap: 0.4rem;
}

.good {
  color: var(--success);
}

.warn {
  color: var(--danger);
}

@media (max-width: 1080px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidepanel {
    position: static;
    max-height: none;
  }
}

@media (max-width: 800px) {
  .overview-row {
    flex-direction: column;
    gap: 0.75rem;
  }

  .theme-panel {
    width: 100%;
    justify-content: flex-start;
  }

  .two-col,
  .results-grid,
  .child-row {
    grid-template-columns: 1fr;
  }
}