:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #102033;
  --muted: #617083;
  --border: #dbe4ef;
  --accent: #1f6feb;
  --accent-dark: #174ea6;
  --danger: #c93636;
  --soft: #eef5ff;
}

* {
  box-sizing: border-box;
}

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

.app-header {
  padding: 36px 42px;
  background: linear-gradient(135deg, #0f2747, #1f6feb);
  color: white;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.8;
}

h1, h2, p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: 34px;
}

.subtitle {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.82);
}

.layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(320px, 1fr));
  gap: 22px;
  padding: 28px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 16px 36px rgba(18, 38, 63, 0.08);
}

.panel-wide {
  grid-column: 1 / -1;
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.panel-title h2 {
  margin-bottom: 0;
  font-size: 20px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--soft);
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.96);
}

button.primary {
  background: var(--accent);
  color: white;
}

button.remove {
  color: var(--danger);
  background: #fff1f1;
}

.stack {
  display: grid;
  gap: 14px;
}

.card-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr) auto;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fbfdff;
}

.card-row.driver {
  grid-template-columns: repeat(3, 1fr) auto;
}

label {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

input, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
  color: var(--text);
  background: white;
}

.rules-box {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  padding: 14px;
  border-radius: 12px;
  background: var(--soft);
  color: #203854;
}

.result {
  display: grid;
  gap: 14px;
}

.result.empty {
  padding: 22px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  color: var(--muted);
}

.driver-plan {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.driver-plan h3 {
  margin: 0 0 10px;
}

.task-chip {
  display: grid;
  gap: 4px;
  padding: 12px;
  margin-top: 8px;
  border-radius: 12px;
  background: #f7faff;
  border: 1px solid var(--border);
}

.meta {
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .app-header {
    padding: 28px 20px;
  }

  .card-row,
  .card-row.driver {
    grid-template-columns: 1fr;
  }
}