:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --border: #e2e4e9;
  --text: #1a1a1a;
  --muted: #6b7280;
  --accent: #7fe8c9;
  --accent-text: #0b3b2e;
  --accent-hover: #2fbd93;
  --orange: #e86a1e;
  --error: #d64545;
  --error-bg: #fdecec;
  --warning-bg: #fff6e5;
  --warning-border: #f0c96b;
  --warning-text: #7a5b00;
  --ink: #2f6fed;
}

* { box-sizing: border-box; }

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.25rem; margin: 0; font-weight: 800; }
.brand-p { color: #F5821F; }
.brand-mid { color: #1D5DA6; }
.brand-c { color: #39B54A; }
.app-name { color: var(--muted); font-weight: 600; margin-left: 0.4rem; }

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 2rem 4rem;
}

.stepper {
  display: flex;
  gap: 0;
  max-width: 1100px;
  margin: 1.25rem auto 0;
  padding: 0 2rem;
}
.step-item {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--border);
}
.step-item .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--border);
  color: var(--text);
  font-size: 0.78rem;
}
.step-item.active { color: var(--accent-text); border-bottom-color: var(--accent); }
.step-item.active .step-num { background: var(--accent); color: var(--accent-text); }
.step-item.done { color: var(--text); border-bottom-color: var(--accent-hover); }
.step-item.done .step-num { background: var(--accent-hover); color: #fff; }

.step-panel.hidden { display: none; }
.step-actions { display: flex; justify-content: space-between; margin-top: 1.25rem; }

.upload-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.25rem;
}
.upload-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: var(--bg);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.upload-card-icon {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-text);
  background: var(--accent);
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.upload-card-title { font-weight: 700; font-size: 0.95rem; }
.upload-card-desc { font-size: 0.78rem; color: var(--muted); min-height: 2.4em; }
.upload-card input[type="file"] { font-size: 0.8rem; margin-top: 0.25rem; }
.upload-card.filled { border-color: var(--accent-hover); background: #fff; }
.upload-remove-btn { position: absolute; top: 0.3rem; right: 0.3rem; line-height: 1; }
.drive-browse-btn { width: 100%; margin-top: 0.3rem; padding: 0.4rem 0.6rem; font-size: 0.8rem; }
.upload-or-divider { text-align: center; font-size: 0.72rem; color: var(--muted); margin: 0.5rem 0 0.1rem; }

.stat-row { display: flex; gap: 1rem; margin: 0.75rem 0 1.25rem; }
.stat-tile {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  text-align: center;
  background: var(--bg);
}
.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--accent-text); }
.stat-label { font-size: 0.78rem; color: var(--muted); margin-top: 0.15rem; }

.range-params-section { margin-bottom: 1.25rem; }
.range-params-grid { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.5rem; }
.range-params-grid label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.85rem; font-weight: 600; }
.range-inputs { display: flex; align-items: center; gap: 0.4rem; font-weight: 400; }
.range-inputs input[type="number"] { width: 5rem; padding: 0.3rem 0.4rem; border: 1px solid var(--border); border-radius: 4px; font-size: 0.85rem; }

.scope-input { width: 100%; padding: 0.3rem 0.4rem; border: 1px solid var(--border); border-radius: 4px; font-size: 0.85rem; }
.scope-qty-input { width: 5rem; }
.row-remove-btn {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem 0.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.card h2 { margin-top: 0; font-size: 1.05rem; }
.card .hint { color: var(--muted); font-size: 0.85rem; margin-top: -0.5rem; }

.upload-row { display: flex; gap: 1rem; flex-wrap: wrap; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field label { font-size: 0.85rem; color: var(--muted); }

input[type="file"] { font-size: 0.85rem; }

button {
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button.secondary {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:hover { background: var(--bg); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { text-align: left; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.03em; }
tr.group-start td { border-top: 1px solid var(--border); }

.badge { display: inline-block; padding: 0.15rem 0.55rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge.ok { background: var(--accent); color: var(--accent-text); }
.badge.warn { background: var(--warning-bg); color: var(--warning-text); border: 1px solid var(--warning-border); }

.qty-input { width: 4.5rem; padding: 0.25rem 0.4rem; border: 1px solid var(--border); border-radius: 4px; }

.wagon-instance-row td { transition: background-color 0.15s ease; }
.wagon-instance-row.wagon-type-barrel td { background: #e6faf3; }
.wagon-instance-row.wagon-type-basket td { background: #fff1e6; }
.wagon-instance-row.wagon-type-rack td { background: #f5e6ff; }
.wagon-instance-row.wagon-type-barrel td:first-child { box-shadow: inset 3px 0 0 var(--accent-hover); }
.wagon-instance-row.wagon-type-basket td:first-child { box-shadow: inset 3px 0 0 var(--orange); }
.wagon-instance-row.wagon-type-rack td:first-child { box-shadow: inset 3px 0 0 #a855f7; }

.unmatched-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.collision-box {
  background: var(--error-bg);
  border: 1px solid var(--error);
  color: var(--error);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.variant-block { margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px dashed var(--border); }
.variant-grid { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-top: 0.4rem; }
.variant-grid label { font-size: 0.82rem; display: flex; align-items: center; gap: 0.35rem; }

.addressing-block { margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px dashed var(--border); }
.addressing-row { display: flex; flex-wrap: wrap; gap: 0.6rem 1.5rem; margin-top: 0.4rem; align-items: center; }
.addressing-field { display: flex; align-items: center; gap: 0.4rem; font-size: 0.82rem; }
.addressing-field label { color: var(--muted); }
.addressing-field input { width: 4.5rem; padding: 0.25rem 0.4rem; border: 1px solid var(--border); border-radius: 4px; }
.addressing-field .area-prefix { font-weight: 700; color: var(--accent-text); }
.addressing-field .confirm-block-btn { padding: 0.2rem 0.6rem; font-size: 0.75rem; }

.tabs { display: flex; gap: 0.4rem; margin-bottom: 0.75rem; }
.tab-btn {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--muted);
  font-weight: 600;
}
.tab-btn.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

.table-scroll { max-height: 420px; overflow: auto; border: 1px solid var(--border); border-radius: 8px; }

.cell-input {
  width: 100%;
  min-width: 6rem;
  border: 1px solid transparent;
  background: transparent;
  font: inherit;
  color: inherit;
  padding: 0.2rem 0.3rem;
  border-radius: 4px;
}
.cell-input:hover { border-color: var(--border); }
.cell-input:focus { border-color: var(--accent-hover); background: var(--bg); outline: none; }
td:has(> .cell-input) { padding: 0.15rem 0.3rem; }

.hidden { display: none !important; }

#status-line { color: var(--muted); font-size: 0.85rem; margin-top: 0.5rem; min-height: 1.2em; }
#status-line.error { color: var(--error); }

.tank-shape-section { margin: 1.5rem 0; }
.tank-shape-section h3 { margin-bottom: 0.2rem; }
.tank-draw-grid {
  width: 100%;
  max-width: 640px;
  height: auto;
  aspect-ratio: 240 / 130;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 0.75rem 0;
  display: block;
}
.tank-draw-grid .draw-dot { fill: var(--border); stroke: none; cursor: pointer; transition: r 0.1s ease, fill 0.1s ease; }
.tank-draw-grid .draw-dot:hover { fill: var(--accent-hover); r: 4.5; }
.tank-draw-grid .draw-dot.used { fill: var(--muted); }
.tank-draw-grid .draw-dot.is-first { fill: var(--accent-hover); }
.tank-draw-grid .draw-dot.is-last { fill: var(--error); }
.tank-draw-grid .draw-line { stroke: var(--ink, #2f6fed); stroke-width: 3; stroke-linecap: round; fill: none; }
.tank-draw-grid .draw-line.new-line-gap { stroke: var(--border); stroke-width: 1.5; stroke-dasharray: 3 3; }
.tank-draw-grid .draw-aisle-label { font-size: 7px; font-weight: 700; fill: var(--text); text-anchor: start; pointer-events: none; }
.tank-draw-controls { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 0.4rem; }
.tank-draw-controls button { padding: 0.4rem 0.8rem; font-size: 0.82rem; }
#tank-shape-preview { min-height: 1.4em; }