:root {
  --bg: #eef1f4;
  --paper: #ffffff;
  --ink: #16181b;
  --muted: #5d6670;
  --line: #cfd5db;
  --line-strong: #9da7b1;
  --error: #b42318;
  --error-bg: #fff1f1;
  --success: #25633b;
  --success-bg: #eef8f1;
  --button: #1f2933;
  --button-hover: #111827;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #e8edf2 0%, #eef1f4 220px, #eef1f4 100%);
  color: var(--ink);
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}

.shell {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(18, 24, 32, 0.08);
  overflow: hidden;
}

.header {
  padding: 28px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #f8fafb 100%);
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

h1, h2, h3 { margin: 0; }

h1 { font-size: 30px; line-height: 1.15; }

.intro { margin: 12px 0 0; max-width: 780px; color: var(--muted); font-size: 14px; }

.local-note {
  margin-top: 16px;
  display: inline-block;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  background: #f7f8fa;
  font-size: 12px;
  border-radius: 999px;
}

.body { padding: 28px; }

.upload-panel,
.actions,
.section-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff 0%, #fbfcfd 100%);
}

.upload-panel {
  padding: 18px;
  margin-bottom: 20px;
}

.upload-panel p,
.workspace-head p { margin: 8px 0 0; color: var(--muted); }

.upload-button,
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--button);
  background: var(--button);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.upload-button { position: relative; overflow: hidden; margin-top: 14px; }
.upload-button input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.upload-button:hover, .btn-primary:hover { background: var(--button-hover); }

.hint { margin-top: 10px; font-size: 12px; color: var(--muted); }

.message {
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid;
}

.message.error { border-color: var(--error); background: var(--error-bg); color: var(--error); }
.message.success { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.hidden { display: none; }

.workspace-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.workspace-meta {
  min-width: 250px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: #f8fafb;
  font-size: 13px;
  color: var(--muted);
}

.section-card {
  padding: 18px;
  margin-bottom: 18px;
}

.section-card h3 { font-size: 19px; margin-bottom: 14px; }

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

.translation-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  background: #fff;
}

.translation-field.full-width { grid-column: 1 / -1; }

.field-label { font-size: 13px; font-weight: 700; }

.pane-title { font-size: 12px; font-weight: 700; color: var(--muted); margin-bottom: 4px; }

.pane textarea,
.pane input {
  width: 100%;
  border: 1px solid var(--line-strong);
  padding: 11px 12px;
  font: inherit;
  background: #fff;
}

.pane textarea { min-height: 110px; resize: vertical; }

.pane.readonly textarea,
.pane.readonly input {
  background: #f7f8fa;
  color: #4b5560;
}

.actions {
  padding: 18px;
  margin-top: 24px;
}

.invalid-translation {
  border-color: var(--error) !important;
  background: var(--error-bg) !important;
}

@media (max-width: 860px) {
  .field-grid { grid-template-columns: 1fr; }
  .workspace-head { flex-direction: column; }
  .workspace-meta { min-width: 0; width: 100%; }
}

@media (max-width: 760px) {
  .page { padding: 0; }
  .shell { border: 0; border-radius: 0; box-shadow: none; }
  .header, .body { padding: 20px; }
  .btn-primary, .upload-button { width: 100%; }
}