:root {
  --blue: #0757a6;
  --blue-dark: #053b72;
  --blue-soft: #eaf4ff;
  --cyan: #19a9e5;
  --ink: #172536;
  --muted: #627387;
  --line: #d8e1eb;
  --surface: #ffffff;
  --bg: #f3f6f9;
  --danger: #c13e3e;
  --success: #0b7a4b;
  --warning: #a66200;
  --radius: 18px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--bg); }
button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }


main { width: min(920px, 100%); margin: 0 auto; padding: 28px 18px 56px; }
.intro { margin-bottom: 22px; }
.eyebrow { margin: 0 0 5px; color: var(--blue); font-size: .75rem; font-weight: 800; letter-spacing: .14em; }
h1 { margin: 0; font-size: clamp(1.8rem, 5vw, 2.55rem); line-height: 1.25; letter-spacing: -.03em; }
.intro > p:last-child { margin: 8px 0 0; color: var(--muted); font-size: .95rem; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 7px 24px rgba(31, 58, 87, .055); }
.panel + .panel { margin-top: 18px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 19px; }
.section-head > div:first-child { display: flex; align-items: center; gap: 10px; }
.section-head h2 { margin: 0; font-size: 1.2rem; }
.step { display: grid; place-items: center; width: 29px; height: 29px; flex: 0 0 auto; border-radius: 9px; color: #fff; background: linear-gradient(145deg, var(--blue), var(--cyan)); font-size: .86rem; font-weight: 800; }

.field-grid { display: grid; gap: 14px; }
.truck-grid { grid-template-columns: repeat(4, 1fr); }
.cargo-grid { grid-template-columns: repeat(5, 1fr); }
.preset-picker { display: grid; grid-template-columns: minmax(190px, 245px) minmax(0, 1fr); align-items: center; gap: 16px; margin-bottom: 17px; border-radius: 13px; background: var(--blue-soft); padding: 14px 16px; }
.preset-controls { display: grid; gap: 7px; }
.preset-controls label { color: var(--blue-dark); font-size: .86rem; font-weight: 800; }
.preset-controls label b { margin-left: 5px; color: #66809a; font-size: .7rem; font-weight: 600; }
.preset-controls select { min-height: 46px; width: 100%; border: 1px solid #9ebad3; border-radius: 10px; background: #fff; color: var(--ink); padding: 8px 36px 8px 11px; font: inherit; font-weight: 750; }
.preset-visual { min-width: 0; display: grid; grid-template-columns: minmax(150px, 210px) minmax(130px, 1fr); align-items: center; gap: 12px; margin: 0; }
.preset-visual[hidden] { display: none; }
.preset-visual img { display: block; width: 100%; height: 112px; object-fit: contain; filter: drop-shadow(0 7px 8px rgba(5, 59, 114, .13)); }
.preset-visual figcaption { min-width: 0; }
.preset-visual strong { display: block; color: var(--blue-dark); font-size: .9rem; line-height: 1.4; }
.preset-visual p { margin: 5px 0 0; color: #405b73; font-size: .78rem; line-height: 1.55; }
.preset-custom-note { margin: 0; color: #405b73; font-size: .82rem; line-height: 1.55; }
.preset-note { margin: 10px 0 0; color: var(--muted); font-size: .75rem; }
label > span:not(.sr-only) { display: block; margin: 0 0 7px; color: #40546a; font-size: .82rem; font-weight: 700; }
label span b { color: #7a8a9b; font-size: .72rem; font-weight: 600; }
input[type="number"], input[type="text"] { width: 100%; min-height: 47px; border: 1px solid #bcc9d6; border-radius: 11px; background: #fbfdff; color: var(--ink); padding: 10px 11px; font-size: 1rem; outline: none; transition: border-color .15s, box-shadow .15s, background .15s; }
input:focus { border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(7, 87, 166, .13); }
input.invalid { border-color: var(--danger); background: #fff7f7; }

.text-button, .add-button, .icon-button { border: 0; cursor: pointer; }
.text-button { color: var(--muted); background: transparent; padding: 8px 0; font-size: .8rem; text-decoration: underline; text-underline-offset: 3px; }
.add-button { min-height: 42px; color: var(--blue); background: var(--blue-soft); border-radius: 10px; padding: 8px 12px; font-weight: 800; }
.add-button span { font-size: 1.1rem; }
.priority-note { margin: -8px 0 14px 39px; color: var(--muted); font-size: .8rem; }
.cargo-section-title { min-width: 0; }
.cargo-heading-image { width: 48px; height: 42px; object-fit: contain; filter: drop-shadow(0 4px 5px rgba(29, 61, 94, .14)); }

.cargo-list { display: grid; gap: 12px; }
.cargo-card { border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 13px; background: #fafcff; padding: 15px; }
.cargo-title-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.cargo-title-main { min-width: 0; flex: 1 1 auto; display: flex; align-items: center; gap: 10px; }
.cargo-box-image { width: 58px; height: 50px; flex: 0 0 auto; object-fit: contain; filter: drop-shadow(0 5px 6px rgba(29, 61, 94, .13)); }
.name-label { width: min(270px, 100%); min-width: 0; }
.name-label input { min-height: 39px; padding: 6px 9px; border: 0; border-bottom: 1px dashed #adbdcc; border-radius: 0; background: transparent; font-weight: 800; }
.name-label input:focus { border-bottom-style: solid; box-shadow: none; }
.cargo-actions { display: flex; gap: 4px; }
.icon-button { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 9px; color: var(--muted); background: transparent; font-weight: 800; }
.icon-button:hover { background: #eaf0f6; }
.icon-button:disabled { opacity: .25; cursor: default; }
.icon-button.remove { color: var(--danger); }
.icon-button svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.cargo-options { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 12px 26px; margin-top: 14px; }
.check-row { display: inline-flex; align-items: center; gap: 9px; cursor: pointer; }
.check-row input { width: 20px; height: 20px; accent-color: var(--blue); }
.check-row span { margin: 0 !important; color: var(--ink) !important; }
.check-row small { display: block; margin-top: 2px; color: var(--muted); font-size: .72rem; font-weight: 500; }

.calculate-wrap { position: sticky; bottom: 0; z-index: 5; padding: 14px 0 max(14px, env(safe-area-inset-bottom)); background: linear-gradient(transparent, var(--bg) 24%); }
.calculate-button { width: 100%; min-height: 58px; display: flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 14px; color: #fff; background: linear-gradient(100deg, var(--blue-dark), var(--blue) 58%, #0876c7); box-shadow: 0 9px 22px rgba(7, 87, 166, .25); font-size: 1.08rem; font-weight: 800; cursor: pointer; }
.calculate-button:active { transform: translateY(1px); }
.calculate-button svg { width: 22px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

.results { scroll-margin-top: 16px; margin-top: 10px; }
.result-hero { overflow: hidden; border-radius: var(--radius); color: #fff; background: linear-gradient(135deg, var(--blue-dark), var(--blue) 64%, #0b87cd); box-shadow: 0 10px 28px rgba(5, 59, 114, .2); }
.result-main { padding: 23px; }
.result-kicker { margin: 0; color: #b9e4ff; font-size: .78rem; font-weight: 700; letter-spacing: .08em; }
.result-number { display: flex; align-items: baseline; gap: 7px; margin-top: 2px; }
.result-number strong { font-size: clamp(2.8rem, 13vw, 4.5rem); line-height: 1; letter-spacing: -.05em; }
.result-number span { font-size: 1.15rem; font-weight: 800; }
.result-summary { margin: 10px 0 0; color: #e5f5ff; font-size: .9rem; }
.meters { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: rgba(255,255,255,.18); }
.meter { padding: 15px 22px; background: rgba(0,0,0,.1); }
.meter-head { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 7px; font-size: .78rem; }
.meter-head b { font-size: .84rem; }
.meter-track { overflow: hidden; height: 7px; border-radius: 99px; background: rgba(255,255,255,.25); }
.meter-fill { height: 100%; border-radius: inherit; background: #65d5ff; }
.meter-fill.over { background: #ffba38; }

.capacity-alert { display: flex; align-items: flex-start; gap: 12px; margin-top: 13px; border: 2px solid #e26335; border-radius: 13px; color: #7d260c; background: #fff0e9; padding: 15px 16px; box-shadow: 0 6px 18px rgba(170, 57, 22, .12); }
.capacity-alert-icon { display: grid; place-items: center; width: 29px; height: 29px; flex: 0 0 auto; border-radius: 50%; color: #fff; background: #d94a1e; font-size: 1rem; font-weight: 900; }
.capacity-alert strong { display: block; font-size: 1rem; line-height: 1.45; }
.capacity-alert p { margin: 4px 0 0; color: #8b3b22; font-size: .8rem; line-height: 1.55; }

.result-list { display: grid; gap: 10px; margin-top: 13px; }
.result-card { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; border: 1px solid var(--line); border-radius: 13px; background: #fff; padding: 16px 17px; }
.result-name { margin: 0; font-size: .98rem; }
.result-detail { margin: 4px 0 0; color: var(--muted); font-size: .78rem; line-height: 1.5; }
.result-count { text-align: right; white-space: nowrap; }
.result-count strong { color: var(--blue); font-size: 1.55rem; }
.result-count span { color: var(--muted); font-size: .8rem; }
.result-status { display: inline-block; margin-top: 4px; border-radius: 99px; padding: 3px 7px; font-size: .68rem; font-weight: 800; }
.result-status.ok { color: var(--success); background: #e5f8ef; }
.result-status.short { color: var(--warning); background: #fff1d3; }
.result-warning { margin: 10px 0 0; border-left: 4px solid var(--warning); border-radius: 8px; color: #6d4808; background: #fff7e5; padding: 11px 13px; font-size: .8rem; line-height: 1.55; }

.loading-diagram { margin-top: 13px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; padding: 19px; box-shadow: 0 7px 24px rgba(31, 58, 87, .045); }
.loading-diagram-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.loading-diagram-kicker { margin: 0 0 3px; color: var(--blue); font-size: .67rem; font-weight: 800; letter-spacing: .12em; }
.loading-diagram h2 { margin: 0; font-size: 1.08rem; }
.loading-diagram-head > span { border-radius: 999px; color: var(--blue); background: var(--blue-soft); padding: 5px 9px; font-size: .7rem; font-weight: 800; }
.loading-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 14px; border-radius: 10px; background: #f4f8fc; padding: 10px 12px; }
.loading-legend-item { display: grid; grid-template-columns: 13px auto; align-items: center; column-gap: 7px; }
.loading-swatch { width: 13px; height: 13px; grid-row: 1 / span 2; border-radius: 3px; }
.loading-swatch.not-stackable { outline: 2px solid #c93636; outline-offset: 1px; }
.loading-legend-item b { color: #31475c; font-size: .76rem; line-height: 1.3; }
.loading-legend-item small { color: var(--muted); font-size: .68rem; }
.loading-views { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; margin-top: 14px; }
.loading-views figure { min-width: 0; margin: 0; border: 1px solid var(--line); border-radius: 12px; background: #f8fbfe; padding: 10px; }
.loading-views figcaption { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 7px; }
.loading-views figcaption b { font-size: .82rem; }
.loading-views figcaption span { color: var(--muted); font-size: .68rem; }
.loading-views canvas { display: block; width: 100%; height: auto; border-radius: 5px; background: #f8fbfe; }
.loading-diagram-note { margin: 11px 0 0; color: var(--muted); font-size: .7rem; line-height: 1.55; }

.notice { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 20px; }
.notice h2 { margin: 0 0 7px; font-size: .9rem; }
.notice p { margin: 0; color: var(--muted); font-size: .78rem; line-height: 1.7; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 760px) {
  .truck-grid { grid-template-columns: 1fr 1fr; }
  .cargo-grid { grid-template-columns: 1fr 1fr; }
  .cargo-grid label:last-child { grid-column: span 2; }
  .panel { padding: 17px; }
  .preset-picker { grid-template-columns: 1fr; gap: 12px; }
  .preset-visual { grid-template-columns: minmax(135px, 190px) 1fr; }
  .preset-visual img { height: 105px; }
}

@media (max-width: 430px) {
  main { padding: 22px 12px 44px; }
  @media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}