:root {
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --text: #1a1d21;
  --text-muted: #6b7280;
  --border: #e3e5e8;
  --accent: #2563eb;
  --tile-bg: #f0f4ff;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a;
    --card-bg: #1d2025;
    --text: #f2f3f5;
    --text-muted: #9aa0aa;
    --border: #2c2f36;
    --accent: #5b8def;
    --tile-bg: #232838;
  }
}

:root[data-theme="dark"] {
  --bg: #14161a;
  --card-bg: #1d2025;
  --text: #f2f3f5;
  --text-muted: #9aa0aa;
  --border: #2c2f36;
  --accent: #5b8def;
  --tile-bg: #232838;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.app-header {
  position: relative;
  text-align: center;
  margin-bottom: 24px;
}

.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field:last-child {
  margin-bottom: 0;
}

.field-row {
  display: flex;
  gap: 16px;
}

.field-row .field {
  flex: 1;
  margin-bottom: 0;
}

label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

input, select {
  font-size: 16px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}

input:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.illustration-card {
  margin-bottom: 12px;
}

.illustration {
  display: grid;
  gap: 2px;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.panel-cell {
  border-radius: 2px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.result-tile {
  background: var(--tile-bg);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.result-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.result-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}

.result-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

@media (max-width: 480px) {
  .field-row {
    flex-direction: column;
    gap: 16px;
  }
  .result-grid {
    grid-template-columns: 1fr;
  }
}