:root {
  --bg: #09111f;
  --panel: rgba(13, 24, 44, 0.92);
  --panel-2: rgba(18, 33, 59, 0.9);
  --border: rgba(131, 176, 255, 0.18);
  --text: #ebf3ff;
  --muted: #95a6c4;
  --accent: #6ed0ff;
  --accent-2: #9df2c8;
  --button-secondary-top: #d9a35a;
  --button-secondary-bottom: #bb7631;
  --button-secondary-text: #241406;
  --button-secondary-shadow: rgba(217, 163, 90, 0.28);
  --danger: #ff8a8a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(85, 167, 255, 0.22), transparent 28%),
    radial-gradient(circle at bottom right, rgba(118, 255, 204, 0.12), transparent 26%),
    linear-gradient(160deg, #07101c 0%, #0b1526 42%, #08111d 100%);
}

.shell { width: min(1180px, calc(100vw - 32px)); margin: 0 auto; padding: 32px 0 48px; }
.hero, .grid.two { display: grid; gap: 20px; }
.hero { grid-template-columns: 1.3fr .9fr; align-items: start; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.32);
}
.eyebrow { text-transform: uppercase; letter-spacing: .14em; color: var(--accent); font-size: .8rem; }
.lead, .muted { color: var(--muted); }
.section-head, .actions, .doc-card { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.stack { display: grid; gap: 16px; }
.stack.compact { gap: 10px; }
.button, button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: linear-gradient(90deg, #5ec8ff, #96f0cb);
  color: #06101a;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(94, 200, 255, 0.18);
  transition: transform .18s ease, box-shadow .18s ease, filter .18s ease;
}
.button:hover, button:hover {
  transform: translateY(-1px);
  filter: saturate(1.03);
}
.button.secondary {
  background: linear-gradient(180deg, var(--button-secondary-top), var(--button-secondary-bottom));
  color: var(--button-secondary-text);
  box-shadow: 0 10px 24px var(--button-secondary-shadow);
}
.button.secondary:hover {
  box-shadow: 0 14px 28px rgba(217, 163, 90, 0.34);
}
.button:disabled, button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
  filter: grayscale(0.15);
}
input, textarea, select {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(7, 13, 25, 0.7);
  color: var(--text);
  padding: 12px 14px;
}
input[type="file"]::file-selector-button {
  border: 0;
  border-radius: 999px;
  margin-right: 12px;
  padding: 10px 16px;
  background: linear-gradient(180deg, var(--button-secondary-top), var(--button-secondary-bottom));
  color: var(--button-secondary-text);
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px var(--button-secondary-shadow);
}
textarea { min-height: 120px; resize: vertical; }
.doc-card, .variant-card, .block-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(10, 18, 33, 0.55);
}
.doc-card {
  gap: 18px;
}
.variant-card pre, .diff-box {
  white-space: pre-wrap;
  font-family: "IBM Plex Mono", monospace;
  font-size: .92rem;
}
.variants-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.markdown-preview {
  padding: 14px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  background: rgba(3, 8, 16, 0.4);
}
.split-input {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}
.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}
.toggle-row input {
  width: auto;
}
.user-row, .key-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(10, 18, 33, 0.55);
}
.user-meta, .key-meta {
  display: grid;
  gap: 4px;
}
.user-actions, .key-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.test-result {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(8, 14, 28, 0.7);
}
.test-result p {
  margin: 8px 0 0;
}
.section-head h4 {
  margin: 0;
}
.danger { color: var(--danger); }
@media (max-width: 920px) {
  .hero, .grid.two { grid-template-columns: 1fr; }
  .split-input { grid-template-columns: 1fr; }
  .user-row, .key-row, .section-head, .actions, .doc-card {
    align-items: flex-start;
    flex-direction: column;
  }
}