.config-page {
  min-height: 100vh;
}

.config-header,
.config-layout,
.config-footer {
  width: min(calc(100% - 2rem), 1440px);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.config-topbar {
  width: 100%;
}

.config-topbar .brand-mark {
  width: 9rem;
  height: 9rem;
}

.config-back {
  color: #344554;
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}

.config-intro {
  max-width: 820px;
  padding: 1rem 0 2rem;
}

.config-intro h1 {
  margin: 0.45rem 0 1rem;
  font-family: "Sora", "Segoe UI", sans-serif;
  font-size: clamp(2.7rem, 6vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.config-intro p,
.config-summary p {
  color: var(--muted);
  line-height: 1.7;
}

.config-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(390px, 0.72fr);
  gap: 1rem;
  align-items: start;
  padding-bottom: 3rem;
}

.config-preview-card,
.config-controls-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.config-preview-card {
  position: sticky;
  top: 1rem;
  overflow: hidden;
}

.config-preview-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.3rem;
}

.config-preview-heading h2,
.config-controls-card h2 {
  margin: 0.35rem 0 0;
  font-family: "Sora", "Segoe UI", sans-serif;
  font-size: 1.8rem;
}

.config-preview-heading > span {
  padding: 0.5rem 0.72rem;
  border-radius: 999px;
  background: rgba(43, 57, 71, 0.08);
  color: #4b5b69;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.canvas-wrap {
  aspect-ratio: 16 / 9;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #dce5ec 0%, #eef3f5 44%, #bdc8c8 45%, #d9dfd8 100%);
}

#fence-preview {
  display: block;
  width: 100%;
  height: 100%;
}

.config-preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0.85rem 1rem 1rem;
  border-top: 1px solid var(--line);
}

.config-preview-meta span {
  padding: 0.46rem 0.65rem;
  border-radius: 999px;
  background: rgba(52, 69, 84, 0.08);
  color: #53626f;
  font-size: 0.78rem;
  font-weight: 700;
}

.config-preview-meta strong {
  color: #2c3b47;
}

.config-controls-card {
  display: grid;
  gap: 1rem;
  padding: 1.35rem;
}

.config-form {
  display: grid;
  gap: 0.85rem;
}

.config-form label {
  display: grid;
  gap: 0.42rem;
}

.config-form label > span {
  color: #455564;
  font-size: 0.9rem;
  font-weight: 700;
}

.config-form select,
.config-form input[type="range"] {
  width: 100%;
}

.config-form input[type="range"] {
  accent-color: #344554;
  cursor: pointer;
}

.config-form select {
  min-height: 46px;
  padding: 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--text);
  font: inherit;
}

.config-form select:focus-visible,
.config-form input:focus-visible {
  outline: 3px solid rgba(52, 69, 84, 0.2);
  outline-offset: 3px;
}

.config-checkbox {
  display: flex !important;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.65rem !important;
}

.config-checkbox input {
  width: 1rem;
  height: 1rem;
  accent-color: #344554;
}

.config-summary {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.config-warning {
  margin: 0;
  padding: 0.8rem;
  border: 1px solid rgba(151, 97, 30, 0.2);
  border-radius: 13px;
  background: rgba(255, 239, 207, 0.72);
  color: #76521f;
  font-size: 0.86rem;
  line-height: 1.55;
}

.config-validation {
  display: grid;
  gap: 0.25rem;
  padding: 0.86rem;
  border: 1px solid rgba(39, 117, 80, 0.22);
  border-radius: 14px;
  background: rgba(223, 243, 232, 0.72);
  color: #315f49;
}

.config-validation[data-state="review"] {
  border-color: rgba(151, 97, 30, 0.2);
  background: rgba(255, 239, 207, 0.72);
  color: #76521f;
}

.config-validation[data-state="invalid"] {
  border-color: rgba(156, 54, 47, 0.22);
  background: rgba(255, 226, 222, 0.74);
  color: #893e38;
}

.config-validation span {
  font-size: 0.84rem;
  line-height: 1.5;
}

.config-summary p {
  margin: 0.55rem 0 1rem;
  font-size: 0.9rem;
}

.config-summary .button {
  width: 100%;
  text-align: center;
}

@media (max-width: 1040px) {
  .config-layout {
    grid-template-columns: 1fr;
  }

  .config-preview-card {
    position: relative;
    top: auto;
  }
}

@media (max-width: 760px) {
  .config-header,
  .config-layout,
  .config-footer {
    width: min(calc(100% - 1.2rem), 1440px);
  }

  .config-topbar {
    flex-wrap: nowrap;
    align-items: center;
  }

  .config-topbar .brand-mark {
    width: 7.2rem;
    height: 7.2rem;
  }

  .config-back {
    max-width: 9rem;
    font-size: 0.95rem;
    text-align: right;
  }

  .canvas-wrap {
    aspect-ratio: 4 / 3;
  }
}