:root {
  color-scheme: light;
  --blue: #0b5cab;
  --blue-dark: #083f78;
  --blue-pale: #eaf4ff;
  --ink: #17212b;
  --muted: #5e6b78;
  --line: #d9e0e7;
  --surface: #ffffff;
  --background: #f3f6f9;
  --success: #147a52;
  --warning: #a75500;
  --shadow: 0 8px 28px rgba(19, 45, 70, 0.08);
  font-family: "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: calc(16px + env(safe-area-inset-top)) 18px 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
}

.app-header h1 {
  margin: 2px 0 0;
  font-size: 1.4rem;
  line-height: 1.25;
}

.eyebrow {
  margin: 0;
  font-size: 0.73rem;
  opacity: 0.8;
}

.offline-badge {
  flex: 0 0 auto;
  padding: 5px 9px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  font-size: 0.7rem;
}

.offline-badge.is-offline {
  color: #3c2a00;
  background: #ffd76a;
  border-color: #ffd76a;
}

.tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.tab {
  min-height: 52px;
  padding: 8px 4px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  font-size: 0.82rem;
  font-weight: 700;
}

.tab.is-active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

main {
  width: min(100%, 920px);
  margin: 0 auto;
  padding: 16px 12px 90px;
}

.screen {
  display: none;
}

.screen.is-active {
  display: block;
}

.intro-card,
.card {
  margin-bottom: 14px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.intro-card {
  color: #fff;
  background: linear-gradient(135deg, #1769b5, #3588cd);
  border: 0;
}

.intro-card h2,
.intro-card p {
  margin: 0;
}

.intro-card h2 {
  font-size: 1.15rem;
}

.intro-card p {
  margin-top: 7px;
  font-size: 0.86rem;
  line-height: 1.65;
  opacity: 0.92;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-heading > div {
  display: flex;
  align-items: center;
  gap: 9px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.05rem;
}

.step {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: #fff;
  background: var(--blue);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 800;
}

.step.done {
  background: var(--success);
}

.section-note {
  margin: -3px 0 14px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.6;
}

.text-button {
  padding: 7px 4px;
  color: var(--blue);
  background: transparent;
  border: 0;
  font-size: 0.76rem;
  font-weight: 700;
}

.tag {
  padding: 5px 8px;
  color: var(--blue-dark);
  background: var(--blue-pale);
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
}

.input-list,
.settings-list {
  display: grid;
  gap: 10px;
}

.input-row,
.setting-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 112px;
  align-items: center;
  gap: 12px;
  min-height: 54px;
  padding: 9px 10px;
  background: #f9fbfd;
  border: 1px solid #e4e9ee;
  border-radius: 10px;
}

.input-label strong,
.setting-label strong {
  display: block;
  font-size: 0.86rem;
  line-height: 1.35;
}

.input-label small,
.setting-label small {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.68rem;
}

.number-control {
  position: relative;
}

.number-control input {
  width: 100%;
  height: 40px;
  padding: 7px 35px 7px 9px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #aebac5;
  border-radius: 8px;
  text-align: right;
  font-size: 1rem;
  font-weight: 700;
}

.number-control input:focus {
  outline: 3px solid rgba(11, 92, 171, 0.18);
  border-color: var(--blue);
}

.unit {
  position: absolute;
  top: 50%;
  right: 9px;
  color: var(--muted);
  transform: translateY(-50%);
  pointer-events: none;
  font-size: 0.72rem;
}

.usage-grid {
  display: grid;
  gap: 12px;
}

.usage-part,
.usage-master-card {
  overflow: hidden;
  background: #f9fbfd;
  border: 1px solid #dfe6ed;
  border-radius: 12px;
}

.usage-part h3,
.usage-master-card h3 {
  margin: 0;
  padding: 10px 12px;
  color: var(--blue-dark);
  background: var(--blue-pale);
  font-size: 0.84rem;
}

.usage-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  padding: 11px;
}

.usage-field label {
  display: block;
  min-height: 30px;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.3;
}

.usage-master-list {
  display: grid;
  gap: 14px;
}

.usage-master-card .usage-fields {
  background: var(--surface);
}

.not-used {
  display: grid;
  place-items: center;
  height: 40px;
  color: #8b96a0;
  background: #edf1f4;
  border-radius: 8px;
  font-size: 0.75rem;
}

.sticky-action {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 15;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.94);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.primary-button,
.secondary-button {
  min-height: 48px;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 800;
}

.primary-button {
  width: 100%;
  color: #fff;
  background: var(--blue);
  border: 1px solid var(--blue);
}

.primary-button:active {
  background: var(--blue-dark);
}

.secondary-button {
  color: var(--blue);
  background: #fff;
  border: 1px solid var(--blue);
}

.form-actions {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 10px;
  margin-top: 16px;
}

.results-card {
  border-top: 4px solid var(--success);
}

.results-list {
  display: grid;
  gap: 10px;
}

.result-item {
  padding: 13px;
  background: #f8fafc;
  border: 1px solid #dfe6ed;
  border-radius: 11px;
}

.result-item.needs-order {
  background: #fff8ef;
  border-color: #efc58c;
}

.result-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.result-title strong {
  font-size: 0.88rem;
}

.order-quantity {
  color: var(--success);
  font-size: 1.02rem;
  font-weight: 900;
  white-space: nowrap;
}

.needs-order .order-quantity {
  color: var(--warning);
}

.result-detail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  margin-top: 9px;
}

.result-detail div {
  padding: 7px 5px;
  background: #fff;
  border-radius: 7px;
  text-align: center;
}

.result-detail span {
  display: block;
  color: var(--muted);
  font-size: 0.63rem;
}

.result-detail b {
  display: block;
  margin-top: 3px;
  font-size: 0.75rem;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 82px;
  left: 18px;
  z-index: 40;
  max-width: 460px;
  margin: auto;
  padding: 12px 16px;
  color: #fff;
  background: #263746;
  border-radius: 10px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(15px);
  pointer-events: none;
  transition: 180ms ease;
  text-align: center;
  font-size: 0.82rem;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 700px) {
  main {
    padding-top: 24px;
  }

  .input-list,
  .settings-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .usage-grid,
  .usage-master-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .sticky-action {
    position: static;
    padding: 0;
    background: none;
    border: 0;
    backdrop-filter: none;
  }

  .sticky-action .primary-button {
    width: min(100%, 420px);
    display: block;
    margin: 18px auto 0;
  }
}

@media (max-width: 390px) {
  .usage-fields {
    grid-template-columns: 1fr;
  }
}