:root {
  color-scheme: light;
  --bg: #f4f6f8; --panel: #fff; --panel-soft: #eef3f5;
  --ink: #17202a; --muted: #657285; --line: #d9e0e7; --line-strong: #b8c4cf;
  --primary: #145c63; --primary-contrast: #fff; --accent: #c98916;
  --green: #237a55; --danger: #ba3a35; --shadow: 0 16px 36px rgba(28,39,52,.08);
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--bg); color: var(--ink); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; letter-spacing: 0; }
button, input, select, textarea { font: inherit; }
button { border: 0; }
h1, h2, h3, p { margin: 0; }
[hidden] { display: none !important; }
.app { width: min(1500px, 100%); margin: 0 auto; padding: 24px; }
.topbar { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 18px; align-items: end; padding: 8px 0 22px; }
.brand { display: grid; gap: 8px; }
.bar-strip { display: grid; grid-template-columns: 56px 36px 46px; gap: 6px; width: max-content; }
.bar-strip span { height: 8px; border-radius: 999px; }
.bar-strip span:nth-child(1) { background: var(--primary); }
.bar-strip span:nth-child(2) { background: var(--accent); }
.bar-strip span:nth-child(3) { background: #4f6f95; }
h1 { font-size: clamp(2rem,4vw,3.7rem); line-height: .98; font-weight: 780; letter-spacing: 0; }
.lead { color: var(--muted); font-size: 1rem; line-height: 1.5; max-width: 720px; margin-top: 6px; }
.top-status { display: inline-flex; gap: 8px; align-items: center; min-height: 34px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); padding: 6px 12px; font-size: .84rem; font-weight: 700; white-space: nowrap; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.workspace { display: grid; grid-template-columns: minmax(360px,.9fr) minmax(520px,1.1fr); gap: 18px; align-items: start; }
.panel { min-width: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); }
.panel-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; padding: 20px 20px 0; }
.panel-title { display: grid; gap: 5px; }
.eyebrow { color: var(--muted); font-size: .76rem; font-weight: 760; letter-spacing: .08em; text-transform: uppercase; }
h2 { font-size: 1.24rem; line-height: 1.2; }
.step { color: #71818b; font-size: .82rem; font-weight: 700; padding: 7px 9px; background: var(--panel-soft); border-radius: 6px; }
.panel-body { padding: 20px; }
form { display: grid; gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.field { display: grid; gap: 7px; min-width: 0; }
label, .field-label { color: #354253; font-size: .86rem; font-weight: 690; }
input, select, textarea { width: 100%; min-width: 0; min-height: 42px; border: 1px solid var(--line-strong); border-radius: 8px; background: #fff; color: var(--ink); padding: 9px 11px; outline: none; transition: border-color 140ms ease, box-shadow 140ms ease; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(20,92,99,.13); }
input[aria-invalid="true"] { border-color: var(--danger); background: #fff6f5; }
button:focus-visible { outline: 3px solid #4f6f95; outline-offset: 3px; }
.unit-input { display: flex; align-items: stretch; min-width: 0; }
.unit-input input { border-top-right-radius: 0; border-bottom-right-radius: 0; flex: 1; width: 0; }
.unit-input select, .unit-input > span { width: 73px; flex: 0 0 73px; border: 1px solid var(--line-strong); border-left: 0; border-radius: 0 8px 8px 0; background: #f8fafc; }
.unit-input > span { display: grid; place-items: center; color: var(--muted); font-size: .86rem; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.presets button { min-width: 45px; min-height: 36px; border: 1px solid var(--line-strong); border-radius: 8px; background: #fff; color: var(--ink); font-weight: 700; font-size: .84rem; padding: 6px 10px; cursor: pointer; }
.presets button[aria-pressed="true"] { border-color: var(--primary); color: var(--primary); background: #edf7f8; box-shadow: inset 0 0 0 1px var(--primary); }
.presets button:hover { background: var(--panel-soft); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 40px; border-radius: 8px; padding: 9px 13px; background: var(--primary); color: var(--primary-contrast); font-weight: 760; text-decoration: none; cursor: pointer; transition: transform 140ms ease, background 140ms ease; }
.btn:hover { transform: translateY(-1px); }
.btn:disabled { cursor: not-allowed; opacity: .5; transform: none; }
.btn.secondary { border: 1px solid var(--line-strong); background: #fff; color: var(--ink); }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding-top: 4px; }
.helper { color: var(--muted); font-size: .82rem; line-height: 1.5; }
.status { color: var(--green); font-size: .86rem; font-weight: 680; }
.status.error { color: var(--danger); line-height: 1.4; }
.result-body { display: grid; gap: 16px; }
.total-card { border: 1px solid #c6dfe1; border-radius: 8px; padding: 18px; background: #edf7f8; }
.result-heading { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.result-heading select { width: 67px; min-height: 32px; padding: 4px 6px; font-size: .82rem; }
.total-card label { color: var(--primary); }
.total-value { display: flex; flex-wrap: wrap; gap: 12px; align-items: baseline; color: var(--primary); margin: 10px 0; }
.total-value output { font-size: clamp(2.3rem,4.5vw,4rem); font-weight: 780; line-height: 1.1; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.total-value > span { font-size: 1.25rem; font-weight: 700; }
.result-caption { font-size: .86rem; color: #45636b; line-height: 1.5; }
.result-grid { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 10px; }
.metric { min-width: 0; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-soft); padding: 12px; }
.metric > span, .metric label { color: var(--muted); font-size: .73rem; font-weight: 750; text-transform: uppercase; letter-spacing: .04em; }
.metric strong { display: block; margin-top: 10px; font-size: 1.12rem; line-height: 1.3; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.metric:not(.sheet-metric) { display: flex; flex-direction: column; justify-content: space-between; }
.paper-summary { display: flex; align-items: center; gap: 12px; padding: 0 0 14px; border-bottom: 1px solid var(--line); }
.paper-icon { flex: 0 0 49px; height: 58px; }
.paper-icon svg { width: 100%; height: 100%; }
.paper-summary strong { font-size: .9rem; }
.paper-summary p { font-size: .82rem; line-height: 1.45; color: var(--muted); margin-top: 5px; }
textarea { resize: vertical; line-height: 1.5; }
.formula-panel { grid-column: 1 / -1; }
.formula-badge { font-size: .82rem; color: var(--muted); background: var(--panel-soft); padding: 6px 10px; border-radius: 6px; white-space: nowrap; }
.formula-body { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.formula { font-size: .93rem; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.calculation-detail { border-left: 3px solid var(--accent); padding-left: 16px; }
.calculation-detail p { margin-top: 8px; font-size: .9rem; line-height: 1.5; overflow-wrap: anywhere; }
.site-footer { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px; border-top: 1px solid var(--line); margin-top: 18px; padding: 18px 0 4px; color: var(--muted); font-size: .82rem; font-weight: 650; }
.calculator-nav { display: inline-flex; gap: 6px; flex-wrap: wrap; margin: 0 0 20px; padding: 4px; max-width: 100%; background: #fff; border: 1px solid var(--line-strong); border-radius: 8px; }
.nav-button { padding: 8px 14px; min-height: 36px; border-radius: 6px; background: transparent; color: #354253; font-size: .86rem; font-weight: 760; cursor: pointer; }
.nav-button[aria-pressed="true"] { background: var(--primary); color: #fff; }
.nav-button:not([aria-pressed="true"]):hover { background: var(--panel-soft); }
.check-label { display: inline-flex; align-items: center; gap: 8px; justify-self: start; min-height: 40px; padding: 8px 11px; border: 1px solid var(--line-strong); border-radius: 8px; background: #fff; font-size: .86rem; font-weight: 730; cursor: pointer; }
.check-label input[type="checkbox"] { flex: 0 0 16px; width: 16px; height: 16px; min-height: 16px; padding: 0; margin: 0; accent-color: var(--primary); }
.form-divider { height: 1px; background: var(--line); }
.pallet-options { border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.pallet-options summary { cursor: pointer; color: var(--primary); font-size: .86rem; font-weight: 700; }
.pallet-options > div, .pallet-options > p { margin-top: 14px; }
.pallet-options a { color: var(--primary); }
.pallet-metrics { grid-template-columns: repeat(3,minmax(0,1fr)); }
.pallet-pager { display: flex; gap: 12px; align-items: center; justify-content: space-between; margin: 18px 0 12px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: #f8fafc; }
.pallet-pager .arrow-button { width: 36px; min-width: 36px; height: 36px; min-height: 36px; padding: 0; font-size: 1.1rem; flex: 0 0 36px; }
.pallet-pager-label { display: grid; gap: 4px; text-align: center; min-width: 0; }
.pallet-pager-label strong { font-size: .94rem; }
.pallet-pager-label span { color: var(--muted); font-size: .76rem; line-height: 1.4; }
.layer-control { display: flex; flex-wrap: wrap; gap: 6px; padding: 4px; border: 1px solid var(--line-strong); border-radius: 8px; width: fit-content; max-width: 100%; margin-top: 14px; }
.layer-control button { min-height: 32px; padding: 7px 10px; border-radius: 6px; color: #354253; background: #fff; font-size: .82rem; font-weight: 730; cursor: pointer; }
.layer-control button[aria-pressed="true"] { background: var(--primary); color: #fff; }
.layer-explanation { margin-top: 9px; }
.pallet-drawing { margin: 16px 0 12px; padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.pallet-drawing svg { display: block; width: 100%; max-height: 480px; }
.pallet-legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: .8rem; color: var(--muted); margin-bottom: 12px; }
.pallet-legend span { display: inline-flex; align-items: center; gap: 6px; }
.pallet-legend i { width: 14px; height: 14px; border-radius: 3px; border: 1px solid var(--line-strong); }
.legend-normal { background: #c6e4e5; }
.legend-rotated { background: #f4dfb1; }
.legend-free { background: repeating-linear-gradient(135deg,#f1f4f8 0px,#f1f4f8 3px,#d9e0e7 3px,#d9e0e7 4px); }
.occupancy-track { height: 7px; border-radius: 6px; overflow: hidden; background: var(--panel-soft); margin: 10px 0 12px; }
.occupancy-track > div { height: 100%; background: var(--primary); }
.pallet-table-wrap { min-width: 0; }
.shipment-overview { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; align-items: center; margin-bottom: 16px; }
.shipment-overview strong { font-size: .94rem; }
.shipment-overview strong span { font-weight: 500; color: var(--muted); }
.shipment-limit { padding: 6px 10px; border-radius: 6px; font-size: .8rem; color: var(--muted); background: var(--panel-soft); }
.shipment-table-frame { border: 1px solid var(--line); border-radius: 8px; overflow-x: auto; }
.pallet-table-wrap table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.pallet-table-wrap td, .pallet-table-wrap th { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; }
.pallet-table-wrap thead th { background: #f8fafc; font-size: .73rem; font-weight: 780; letter-spacing: .04em; color: var(--muted); text-transform: uppercase; }
.pallet-table-wrap .numeric { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.pallet-table-wrap tbody tr:last-child > * { border-bottom: 0; }
.pallet-table-wrap tbody tr.is-selected { background: #f0f8f8; }
.pallet-table-wrap tbody th { font-weight: 700; }
.table-pallet-link { padding: 0; background: transparent; color: var(--primary); font: inherit; font-weight: 760; text-align: left; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.table-subtext { display: block; margin-top: 5px; color: var(--muted); font-size: .76rem; font-weight: 500; }
.table-unit { color: var(--muted); font-size: .82rem; }
.layer-badge { display: inline-flex; padding: 4px 9px; border-radius: 999px; font-size: .8rem; font-weight: 700; white-space: nowrap; background: #e6f4ed; color: #176c45; }
.layer-badge.partial { background: #fff3d4; color: #7b5700; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 1100px) { .workspace { grid-template-columns: 1fr; } }
@media (max-width: 760px) {
  .app { padding: 14px; }
  .topbar, .grid-2, .result-grid, .formula-body { grid-template-columns: 1fr; }
  .top-status { justify-self: start; }
  .panel-header { flex-wrap: wrap; }
  .btn { width: 100%; }
  .metric strong { margin-top: 8px; }
  .form-actions { gap: 8px; }
  .formula-body { gap: 18px; }
  .total-value output { font-size: clamp(2rem,10vw,3.4rem); }
  .calculator-nav { width: 100%; }
  .nav-button { flex: 1; padding: 9px; font-size: .85rem; }
  .pallet-metrics { grid-template-columns: 1fr; }
  .pallet-table-wrap table, .pallet-table-wrap tbody { display: block; }
  .pallet-table-wrap thead { display: none; }
  .pallet-table-wrap tbody tr { display: block; padding: 14px; border-bottom: 1px solid var(--line); }
  .pallet-table-wrap tbody tr:last-child { border-bottom: 0; }
  .pallet-table-wrap tbody th { display: block; padding: 0 0 12px; border: 0; }
  .pallet-table-wrap td, .pallet-table-wrap td.numeric { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: baseline; gap: 5px; padding: 9px 0; border: 0; text-align: right; white-space: normal; }
  .pallet-table-wrap td::before { content: attr(data-label); margin-right: auto; color: var(--muted); font-size: .8rem; text-align: left; }
  .pallet-table-wrap td .table-subtext { margin: 0; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } .btn:hover { transform: none; } }