:root {
  --bg: #f3f6f9;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --line: #dbe3ec;

  --ok: #1a9a52;
  --ok-bg: #e8f7ef;

  --warn: #c78a10;
  --warn-bg: #fff7dd;

  --danger: #cf3f2f;
  --danger-bg: #fdecea;

  --accent: #203347;
  --accent-hover: #162635;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background:
    radial-gradient(circle at 10% 0%, #e9f1f8 0%, transparent 30%),
    radial-gradient(circle at 90% 20%, #fbeee8 0%, transparent 25%),
    var(--bg);
  color: var(--text);
  padding: 20px;
}

.app {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 8px 24px rgba(31, 41, 55, 0.06);
}

h1 {
  margin: 0;
  font-size: 1.6rem;
}

.subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.mt-16 {
  margin-top: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}

label {
  font-weight: 700;
  font-size: 0.95rem;
}

input[type="number"],
input[type="text"] {
  width: 100%;
  border: 1px solid #c9d3df;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 1rem;
  background: #fff;
}

input:focus {
  outline: none;
  border-color: #7ea6cc;
  box-shadow: 0 0 0 3px rgba(126, 166, 204, 0.2);
}

.item-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
}

.item-row-head {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn-main {
  background: var(--accent);
  color: #fff;
}

.btn-main:hover {
  background: var(--accent-hover);
}

.btn-sub {
  background: #eef2f7;
  color: #243548;
}

.btn-danger {
  background: #fbe3e0;
  color: #8d2319;
}

.result {
  border-radius: 12px;
  padding: 14px;
  border: 2px solid transparent;
  min-height: 150px;
  transition: 0.25s ease;
}

.result.ok {
  background: var(--ok-bg);
  border-color: var(--ok);
}

.result.warn {
  background: var(--warn-bg);
  border-color: var(--warn);
}

.result.danger {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.result h2 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.result p {
  margin: 6px 0;
}

.result-subtitle {
  margin-top: 10px;
  font-weight: 700;
}

.plan-list {
  margin: 6px 0 0;
  padding-left: 20px;
}

.plan-list li {
  margin: 4px 0;
}

.plan-list .plan-shortage {
  color: var(--danger);
  font-weight: 700;
}

.hint {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 700px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .item-row {
    grid-template-columns: 1fr;
  }

  .item-row-head {
    display: none;
  }
}