:root {
  --color-bg: #faf7f2;
  --color-surface: #ffffff;
  --color-accent: #c96f4a;
  --color-accent-dark: #a8552f;
  --color-text: #3a3226;
  --color-text-muted: #7a6f5e;
  --color-border: #e6ddd0;
  --color-danger: #b3432b;
  --color-success: #4a7c59;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(58, 50, 38, 0.08);
}

* { box-sizing: border-box; }

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

a { color: var(--color-accent-dark); }

/* ---------- Header ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 16px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.logo {
  margin: 0;
  font-size: 1.25rem;
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.logo-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-text-muted);
}
.pro-badge {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.pro-badge--free {
  background: #efe8dc;
  color: var(--color-text-muted);
}
.pro-badge--active {
  background: var(--color-accent);
  color: #fff;
}

body.is-pro .btn-pro-gate {
  opacity: 1;
}
body.is-pro .pro-tag {
  display: none;
}

.print-only {
  display: none;
}

.tabs {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 4px;
  padding: 0 12px;
  overflow-x: auto;
}
.tab-btn {
  appearance: none;
  border: none;
  background: none;
  padding: 10px 12px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tab-btn.is-active {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}
.pro-tag {
  display: inline-block;
  font-size: 0.65rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 4px;
  padding: 1px 5px;
  margin-left: 4px;
  vertical-align: middle;
}

/* ---------- Main / layout ---------- */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}
.view { display: none; }
.view.is-active { display: block; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 16px;
}
fieldset.card {
  min-width: 0;
}
legend {
  font-weight: 600;
  padding: 0 4px;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 800px) {
  .calc-layout {
    grid-template-columns: 1fr 380px;
    align-items: start;
  }
}

.field-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.field-row label {
  flex: 0 0 auto;
  min-width: 130px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.field-row input[type="text"],
.field-row select {
  flex: 1 1 120px;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
  background: #fff;
  color: var(--color-text);
}
.field-row--checkbox label {
  min-width: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.target-mode-row {
  gap: 20px;
}
.target-mode-row label {
  min-width: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.material-lines {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}
.material-line {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.7fr 0.7fr 0.8fr auto;
  gap: 6px;
  align-items: center;
}
.material-line input {
  width: 100%;
  padding: 7px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.9rem;
}
.material-line .btn-remove-line {
  background: none;
  border: none;
  color: var(--color-danger);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px 8px;
}
@media (max-width: 560px) {
  .material-line {
    grid-template-columns: 1fr 1fr;
  }
  .material-line input[data-field="name"] {
    grid-column: 1 / -1;
  }
}
.material-line-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); }
.btn-secondary {
  background: #fff;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-accent); }
.btn-danger {
  background: #fff;
  color: var(--color-danger);
  border-color: var(--color-danger);
}
.btn-text {
  background: none;
  border: none;
  color: var(--color-text-muted);
}
.btn-pro-gate {
  opacity: 0.55;
  position: relative;
}
.btn[disabled] {
  cursor: not-allowed;
}
.file-input-label {
  cursor: pointer;
}

/* ---------- Result card ---------- */
.result-card { position: sticky; top: 90px; }
.result-price-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.result-price {
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin: 4px 0 12px;
}
.result-error {
  background: #fbeae5;
  color: var(--color-danger);
  padding: 10px 12px;
  border-radius: 6px;
  margin-bottom: 12px;
  font-size: 0.9rem;
}
.result-bar {
  display: flex;
  height: 14px;
  border-radius: 7px;
  overflow: hidden;
  margin-bottom: 14px;
  background: var(--color-border);
}
.result-bar-seg { height: 100%; }
.seg-material { background: #c96f4a; }
.seg-packaging { background: #d9a066; }
.seg-labor { background: #e0c48c; }
.seg-other { background: #b9c99a; }
.seg-fee { background: #8fa6b8; }
.seg-profit { background: #4a7c59; }

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 10px;
}
.result-table td {
  padding: 4px 2px;
  border-bottom: 1px dashed var(--color-border);
}
.result-table td:last-child,
.result-table td:nth-child(2) {
  text-align: right;
}
.result-sub {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.compare-panel { margin-top: 12px; }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.compare-table th, .compare-table td {
  padding: 6px 4px;
  border-bottom: 1px solid var(--color-border);
  text-align: right;
}
.compare-table th:first-child, .compare-table td:first-child { text-align: left; }

/* ---------- Data tables (products / materials / settings) ---------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.table-scroll table {
  min-width: 480px;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-top: 10px;
}
.data-table th, .data-table td {
  padding: 8px 6px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.data-table th[data-sort] { cursor: pointer; user-select: none; }
.data-table th[data-sort]:hover { color: var(--color-accent-dark); }
.data-table td.num { text-align: right; }
.empty-msg {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 12px 0;
}
.field-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.field-error {
  color: var(--color-danger);
  font-size: 0.85rem;
}
.pro-active-msg {
  color: var(--color-success);
  font-weight: 600;
}

.pro-gate-panel {
  background: #f4ede2;
  border: 1px dashed var(--color-accent);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
}
.pro-gate-panel p { margin-top: 0; }
.pro-gate-panel .btn { margin: 4px; }

/* ---------- SEO article ---------- */
.seo-article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 20px 8px;
  margin-top: 24px;
  font-size: 0.94rem;
}
.seo-article h2 { font-size: 1.2rem; }
.seo-article h3 { font-size: 1.02rem; color: var(--color-accent-dark); }
.seo-article h4 { font-size: 0.96rem; margin-bottom: 4px; }
.static-fee-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 10px 0;
}
.static-fee-table th, .static-fee-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.fee-table-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.faq-item { margin-bottom: 14px; }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(58, 50, 38, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}
.modal-box {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  max-width: 420px;
  width: 100%;
}
.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

/* ---------- Toast ---------- */
.toast-container {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
}
.toast {
  background: var(--color-text);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  box-shadow: var(--shadow);
  opacity: 0.96;
}
.toast.toast-error { background: var(--color-danger); }

/* ---------- Footer ---------- */
.site-footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}
.footer-nav {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

/* ---------- Print ---------- */
@media print {
  .site-header, .tabs, .calc-inputs, .result-actions, .site-footer,
  .seo-article, .toast-container, #compare-panel, .nav, .modal-overlay {
    display: none !important;
  }
  .calc-layout { grid-template-columns: 1fr; }
  .result-card { box-shadow: none; border: 1px solid #000; position: static; }
  .print-only { display: block; }
}