:root {
  --bg: #eef1f6;
  --card: #ffffff;
  --card-alt: #f8f9fb;
  --border: #dfe3ea;
  --text: #1a1d24;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-dark: #4338ca;
  --accent-soft: rgba(79, 70, 229, 0.09);
  --accent-soft-strong: rgba(79, 70, 229, 0.16);
  --danger: #b91c1c;
  --danger-soft: rgba(185, 28, 28, 0.08);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 2px 8px rgba(16, 24, 40, 0.06);
  --shadow-lg: 0 4px 10px rgba(16, 24, 40, 0.06), 0 12px 28px rgba(16, 24, 40, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101217;
    --card: #1b1e25;
    --card-alt: #21252d;
    --border: #2e333d;
    --text: #eceef2;
    --muted: #9aa1ac;
    --accent: #818cf8;
    --accent-dark: #a5b4fc;
    --accent-soft: rgba(129, 140, 248, 0.14);
    --accent-soft-strong: rgba(129, 140, 248, 0.22);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 8px rgba(0, 0, 0, 0.28);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.32), 0 16px 32px rgba(0, 0, 0, 0.36);
  }
}

* { 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);
  padding-bottom: 3rem;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
}
.topbar-titles { min-width: 0; }
.topbar h1 {
  font-size: 1.05rem;
  margin: 0;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-id { font-size: 0.7rem; color: var(--muted); margin-top: 0.1rem; letter-spacing: 0.02em; }

.progress { display: flex; flex-direction: column; align-items: flex-end; gap: 0.3rem; flex-shrink: 0; }
.progress-track {
  width: 96px;
  height: 5px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  border-radius: 999px;
  transition: width 0.25s ease;
}
.progress-text { font-size: 0.68rem; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }

main { max-width: 720px; margin: 0 auto; padding: 1.1rem 1rem 2rem; }

.scan-panel {
  background: linear-gradient(165deg, var(--accent-soft), var(--card) 55%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-lg);
}

.scan-panel-head { display: flex; gap: 0.8rem; align-items: flex-start; margin-bottom: 0.9rem; }
.scan-icon {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.scan-icon svg { width: 1.15rem; height: 1.15rem; }

.scan-panel h2 { font-size: 1rem; margin: 0.15rem 0 0.2rem; }
.hint { color: var(--muted); font-size: 0.83rem; margin: 0; line-height: 1.4; }

.scan-buttons { display: flex; gap: 0.6rem; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.05s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn-icon { width: 1.05rem; height: 1.05rem; flex-shrink: 0; }
.btn.primary { background: var(--accent); color: #fff; box-shadow: 0 1px 2px rgba(0,0,0,0.08), 0 4px 10px var(--accent-soft-strong); }
.btn.primary:active { background: var(--accent-dark); transform: translateY(1px); }
.btn.secondary { background: var(--card); color: var(--text); border-color: var(--border); }
.btn.secondary:active { background: var(--card-alt); transform: translateY(1px); }
.btn:disabled { opacity: 0.5; pointer-events: none; }

.preview-wrap { margin-top: 1rem; }
.preview-wrap img {
  width: 100%;
  max-height: 340px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #000;
  box-shadow: var(--shadow);
}
.scan-actions { display: flex; gap: 0.6rem; margin-top: 0.75rem; flex-wrap: wrap; }

.scan-status {
  margin-top: 0.9rem;
  font-size: 0.87rem;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--text);
  line-height: 1.4;
}
.scan-status.error { background: var(--danger-soft); color: var(--danger); }

.hidden { display: none !important; }

.section-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.7rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.section-card > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  -webkit-tap-highlight-color: transparent;
}
.section-card > summary::-webkit-details-marker { display: none; }

.section-title {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  position: relative;
  padding-left: 1.1rem;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0.5rem;
  height: 0.5rem;
  margin-top: -0.28rem;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
}
.section-card[open] > summary .section-title::before {
  transform: rotate(45deg);
  margin-top: -0.35rem;
}

.section-count {
  font-size: 0.72rem;
  color: var(--muted);
  background: var(--card-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.section-body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9rem;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.6rem;
}

.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field-wide { grid-column: 1 / -1; }

.field label {
  font-size: 0.71rem;
  color: var(--muted);
  line-height: 1.25;
}

.field input, .field textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card-alt);
  color: var(--text);
  width: 100%;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
}

.field input[readonly] {
  background: var(--card-alt);
  color: var(--muted);
  cursor: default;
}
.field input[readonly]:focus {
  border-color: var(--border);
  background: var(--card-alt);
}

.field input.filled-by-scan, table.sieve-table input.filled-by-scan {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.grid-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
table.grid-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
}
table.grid-table th, table.grid-table td {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 0.45rem 0.5rem;
  text-align: center;
}
table.grid-table th:last-child, table.grid-table td:last-child { border-right: none; }
table.grid-table tbody tr:last-child td { border-bottom: none; }
table.grid-table th {
  font-size: 0.68rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  background: var(--card-alt);
}
table.grid-table td.row-label {
  white-space: nowrap;
  font-weight: 600;
  font-size: 0.8rem;
  text-align: left;
  background: var(--card-alt);
}
table.grid-table tbody tr:nth-child(even) td:not(.row-label) {
  background: color-mix(in srgb, var(--card-alt) 55%, transparent);
}
table.grid-table input {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  text-align: center;
  padding: 0.3rem 0.2rem;
}
table.grid-table input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
}
table.grid-table input[readonly] {
  background: var(--card-alt);
  color: var(--muted);
  cursor: default;
}
table.grid-table input.filled-by-scan {
  border-color: var(--accent);
  background: var(--accent-soft);
}

table.label-value-table td.row-label {
  width: 60%;
  font-weight: 500;
  font-size: 0.82rem;
}
table.label-value-table td:not(.row-label) { text-align: left; }
table.label-value-table input { text-align: left; }

.mass-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 480px) {
  .mass-result-grid { grid-template-columns: 1fr; }
}
.mass-result-col { min-width: 0; }
.subsection-heading {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.spec-status {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.6rem;
  min-height: 1em;
}

table.sieve-table tr.spec-hidden { display: none; }

table.sieve-table tr.row-out-of-spec td {
  background: var(--danger-soft);
}
table.sieve-table tr.row-out-of-spec td.row-label {
  color: var(--danger);
  box-shadow: inset 3px 0 0 var(--danger);
}
table.sieve-table tr.row-out-of-spec input {
  color: var(--danger);
  font-weight: 700;
}

.sieve-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
table.sieve-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 560px;
  font-size: 0.83rem;
}
table.sieve-table thead th {
  position: sticky;
  top: 0;
  background: var(--card-alt);
  z-index: 1;
}
table.sieve-table th, table.sieve-table td {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 0.4rem;
  text-align: center;
}
table.sieve-table th:last-child, table.sieve-table td:last-child { border-right: none; }
table.sieve-table th { font-size: 0.68rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.02em; }
table.sieve-table td.row-label { white-space: nowrap; font-weight: 600; font-size: 0.8rem; text-align: left; background: var(--card-alt); }
table.sieve-table tbody tr:last-child td { border-bottom: none; }
table.sieve-table tbody tr:nth-child(even) td:not(.row-label) { background: color-mix(in srgb, var(--card-alt) 55%, transparent); }
table.sieve-table input {
  width: 100%;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  text-align: center;
  padding: 0.3rem 0.2rem;
}
table.sieve-table input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
}
table.sieve-table input[readonly] {
  background: var(--card-alt);
  color: var(--muted);
  cursor: default;
}
table.sieve-table input[readonly]:focus {
  border-color: transparent;
  background: var(--card-alt);
}
table.sieve-table tr.row-out-of-spec input[readonly] {
  color: var(--danger);
  background: var(--danger-soft);
}
.calc-note {
  display: block;
  font-size: 0.6rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
  opacity: 0.75;
}

.form-footer {
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
  margin-top: 0.9rem;
  flex-wrap: wrap;
}

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-right: 0.5em;
  vertical-align: -0.15em;
}
@keyframes spin { to { transform: rotate(360deg); } }