/* ── Layout ────────────────────────────────────────────────────────────────── */

.submit-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

.submit-columns {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.submit-main {
  flex: 1;
  min-width: 0;
}

/* ── Page header ─────────────────────────────────────────────────────────── */

.submit-header {
  margin-bottom: 1.25rem;
}

.submit-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.submit-subtitle {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.submit-prefill-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.submit-prefill-label {
  font-size: 0.82rem;
  color: var(--color-muted);
  font-weight: 500;
  white-space: nowrap;
}

.submit-prefill-input {
  font-size: 0.82rem;
}

.submit-prefill-status {
  font-size: 0.8rem;
  color: var(--color-success);
}

/* ── Form sections ───────────────────────────────────────────────────────── */

.form-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
}

.form-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  user-select: none;
}

.form-section-header:hover { background: #e8edf3; }

.form-section-title {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin: 0;
}

.form-section-icon {
  font-size: 0.8rem;
  color: var(--color-muted);
  transition: transform 0.15s;
}

.form-section.is-collapsed .form-section-icon { transform: rotate(-90deg); }
.form-section.is-collapsed .form-section-body { display: none; }

.form-section-body {
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* ── Form rows ───────────────────────────────────────────────────────────── */

.form-row {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  align-items: start;
  gap: 0.5rem;
}

.form-row.wide {
  grid-template-columns: 220px 1fr;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  padding-top: 0.3rem;
  line-height: 1.3;
}

.form-label small {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--color-muted);
}

.form-control {
  font-size: 0.875rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
  width: 100%;
  color: var(--color-text);
}

.form-control:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
}

.form-control.is-invalid {
  border-color: var(--color-danger);
}

select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; }

/* ── Unit + ref combined control ─────────────────────────────────────────── */

.form-input-group {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.form-unit-select {
  font-size: 0.8rem;
  padding: 0.3rem 0.35rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
  cursor: pointer;
  white-space: nowrap;
}

.form-ref-select {
  font-size: 0.78rem;
  padding: 0.3rem 0.35rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
  cursor: pointer;
  color: var(--color-muted);
  min-width: 100px;
}

/* ── Range row (min/max pair) ────────────────────────────────────────────── */

.form-range-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.form-range-group .range-sep {
  color: var(--color-muted);
  font-size: 0.8rem;
}

.form-range-group input {
  width: 90px;
}

/* ── Checkbox/tag group ──────────────────────────────────────────────────── */

.form-tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.form-tag {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  background: white;
  user-select: none;
}

.form-tag input[type="checkbox"] {
  width: 12px;
  height: 12px;
  cursor: pointer;
}

.form-tag.is-checked {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ── Hardness sub-group ──────────────────────────────────────────────────── */

.hardness-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hardness-form-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.hardness-form-row label {
  width: 60px;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.hardness-form-row input { width: 90px; }

/* ── S-N curve sub-table ─────────────────────────────────────────────────── */

.sn-editor {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.sn-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
}

.sn-row label { width: 80px; color: var(--color-muted); }
.sn-row input { width: 100px; }

.sn-add-btn, .sn-remove-btn {
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
  cursor: pointer;
  color: var(--color-muted);
}

.sn-add-btn:hover { background: var(--color-primary-light); color: var(--color-primary); }
.sn-remove-btn:hover { background: #fef2f2; color: var(--color-danger); }

/* ── CTE table ───────────────────────────────────────────────────────────── */

.cte-editor {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cte-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
}

.cte-row label { width: 100px; color: var(--color-muted); }
.cte-row input { width: 90px; }

/* ── Actions ─────────────────────────────────────────────────────────────── */

.submit-actions {
  margin-top: 1.25rem;
}

.btn-download {
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1.5rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}

.btn-download:hover { background: var(--color-primary-dark); }

/* ── Post-download ───────────────────────────────────────────────────────── */

.post-download {
  margin-top: 1.25rem;
  background: #f0fdf4;
  border: 1px solid #86efac;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.post-download h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #15803d;
}

.pr-steps {
  padding-left: 1.25rem;
  font-size: 0.85rem;
  line-height: 1.6;
  color: #166534;
}

.pr-steps li { margin-bottom: 0.5rem; }

.pr-steps code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: #dcfce7;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

/* ── Reference panel ─────────────────────────────────────────────────────── */

.ref-panel {
  width: 270px;
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  max-height: calc(100vh - var(--header-height) - 2rem);
  display: flex;
  flex-direction: column;
}

.ref-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.75rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.ref-panel-title {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin: 0;
}

.btn-add-ref {
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--color-primary);
  border-radius: 4px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  cursor: pointer;
  font-weight: 600;
}
.btn-add-ref:hover { background: var(--color-primary); color: white; }

.ref-panel-list {
  list-style: none;
  padding: 0;
  margin: 0;
  overflow-y: auto;
  flex: 1;
}

.ref-panel-item {
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.4;
  color: var(--color-text);
}

.ref-panel-item:last-child { border-bottom: none; }

.ref-panel-section-header {
  padding: 0.25rem 0.75rem;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  background: var(--color-bg-subtle, #f8f9fa);
  border-bottom: 1px solid var(--color-border);
}

.ref-panel-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
}

/* ── Reference panel item row ────────────────────────────────────────────── */

.ref-panel-item-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.4rem;
}

.btn-ref-edit {
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: white;
  color: var(--color-muted);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.btn-ref-edit:hover { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); }

/* ── Add reference form ──────────────────────────────────────────────────── */

.ref-add-form {
  padding: 0.75rem;
  border-top: 1px solid var(--color-border);
  background: #f8fafc;
  flex-shrink: 0;
}

/* ── Tabs ────────────────────────────────────────────────────────────────── */

.ref-add-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 0.6rem;
  border-bottom: 1px solid var(--color-border);
}

.ref-tab {
  font-size: 0.78rem;
  padding: 0.25rem 0.65rem;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  margin-bottom: -1px;
}

.ref-tab.is-active {
  background: #f8fafc;
  border-color: var(--color-border);
  color: var(--color-text);
  font-weight: 600;
}

.ref-tab-panel { /* no extra style needed; hidden attr handles visibility */ }

.ref-required { color: var(--color-danger); }

.ref-add-hint {
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-bottom: 0.4rem;
}

.ref-bibtex-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  resize: vertical;
  margin-bottom: 0.5rem;
  background: white;
}

.ref-add-fields {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.ref-add-fields label {
  font-size: 0.78rem;
  color: var(--color-muted);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.ref-add-fields input {
  font-size: 0.8rem;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
}

.ref-add-actions {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.btn-ref-save {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.btn-ref-save:hover { background: var(--color-primary-dark); }

.btn-ref-cancel {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  background: white;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
}
.btn-ref-cancel:hover { background: var(--color-bg); }

.ref-add-or {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-muted);
  margin: 0.4rem 0;
}

.ref-bib-upload-label {
  font-size: 0.78rem;
  color: var(--color-muted);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.ref-bib-upload-input { font-size: 0.78rem; }

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 760px) {
  .submit-columns { flex-direction: column; }
  .ref-panel { width: 100%; position: static; max-height: none; }
  .form-row { grid-template-columns: 1fr; }
  .form-row.wide { grid-template-columns: 1fr; }
}