:root {
  --wood-900: #2b211d;
  --wood-700: #5b4236;
  --wood-500: #8a5f47;
  --wood-200: #d7bc99;
  --sand-100: #f5eee4;
  --sand-200: #ecdfcd;
  --surface: rgba(255, 251, 244, 0.92);
  --line: rgba(91, 66, 54, 0.24);
  --muted: #6c5a50;
  --danger: #b6342f;
  --shadow: 0 24px 48px rgba(43, 33, 29, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--wood-900);
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 14%, rgba(215, 188, 153, 0.32), transparent 36%),
    radial-gradient(circle at 88% 82%, rgba(91, 66, 54, 0.18), transparent 42%),
    linear-gradient(160deg, var(--sand-100), var(--sand-200));
}

.container {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 0 24px;
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(248, 246, 242, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(91, 66, 54, 0.14);
  padding: 12px 0;
}

.header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.logo-area {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(91, 66, 54, 0.14);
}

.site-logo {
  height: 52px;
  width: auto;
  border-radius: 999px;
  object-fit: cover;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-slogan {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 22px;
  align-items: center;
  margin: 0;
  padding: 0;
}

.main-nav a {
  position: relative;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--wood-900);
  padding: 6px 0;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--wood-500), var(--wood-700));
  border-radius: 999px;
  transition: width 220ms ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--wood-700);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.nav-cart-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 22px;
  padding: 0 8px;
  margin-left: 6px;
  border-radius: 999px;
  background: rgba(138, 95, 71, 0.16);
  color: var(--wood-700);
  font-size: 0.75rem;
  font-weight: 700;
}

.layout {
  min-height: 100vh;
  padding: 26px;
  display: grid;
  place-items: center;
}

.estimator-card {
  width: min(1080px, 100%);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
  padding: clamp(20px, 3.5vw, 38px);
}

.card-header {
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--wood-500);
}

h1,
h2 {
  margin: 0;
  font-family: "Cormorant Garamond", Georgia, serif;
}

h1 {
  margin-top: 4px;
  font-size: clamp(2rem, 5vw, 3.3rem);
  line-height: 1.06;
}

.card-header > p:last-child {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 760px;
}

.wood-db,
.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.68);
}

.wood-db h2,
.panel h2 {
  font-size: 1.75rem;
  margin-bottom: 10px;
}

.wood-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.wood-item {
  border: 1px dashed rgba(91, 66, 54, 0.34);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.85);
  padding: 10px 12px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.wood-item .wood-name {
  font-weight: 600;
  color: var(--muted);
}

.wood-item .wood-value {
  color: var(--wood-700);
  font-weight: 700;
}

#calculator-form {
  margin-top: 18px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field span {
  font-weight: 600;
  color: var(--wood-900);
}

.field input,
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 13px;
  font: inherit;
  color: var(--wood-900);
  background: #fffcf8;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--wood-500);
  box-shadow: 0 0 0 3px rgba(138, 95, 71, 0.18);
}

.formula-chip-grid {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.formula-chip {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.74);
}

.form-error {
  min-height: 20px;
  margin: 12px 0 6px;
  color: var(--danger);
  font-weight: 600;
}

.confirmation-note {
  margin: 12px 0 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(138, 95, 71, 0.08);
  color: var(--wood-700);
  font-weight: 600;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  padding: 12px 20px;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(130deg, var(--wood-500), var(--wood-700));
  color: #fff;
  box-shadow: 0 10px 22px rgba(91, 66, 54, 0.26);
}

.btn-secondary {
  color: var(--wood-700);
  background: #f4e6d4;
}

.panel-grid {
  margin-top: 22px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.result-row {
  border-top: 1px dashed rgba(91, 66, 54, 0.25);
  padding: 10px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.result-row:first-of-type {
  border-top: none;
}

.result-row span {
  color: var(--muted);
}

.result-row strong {
  color: var(--wood-900);
}

.result-row-total strong {
  color: var(--wood-700);
  font-size: 1.02rem;
}

.bom-panel {
  margin-top: 14px;
}

.bom-note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.bom-list {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}

.bom-item {
  border: 1px dashed rgba(91, 66, 54, 0.24);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.77);
  padding: 9px 11px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.bom-item-name {
  color: var(--muted);
}

.bom-item-volume {
  font-weight: 700;
  color: var(--wood-700);
}

@media (max-width: 900px) {
  .header-flex {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav ul {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 14px;
  }

  .logo-area {
    width: 100%;
    justify-content: center;
  }

  .main-nav ul {
    gap: 10px 14px;
  }

  .main-nav a {
    font-size: 0.85rem;
  }

  .layout {
    padding: 14px;
  }

  .estimator-card {
    border-radius: 18px;
  }

  .form-grid,
  .wood-grid {
    grid-template-columns: 1fr;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .result-row,
  .bom-item,
  .wood-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}