:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #d9e1ec;
  --primary: #1463ff;
  --primary-dark: #0f49c7;
  --soft: #eef4ff;
  --danger: #b42318;
  --success: #027a48;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 300px 1fr;
}

.sidebar {
  background: #0f172a;
  color: #fff;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.brand .logo {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, #33d6ff, #1463ff);
  display: grid;
  place-items: center;
  font-weight: 800;
}

.brand strong { display: block; font-size: 18px; }
.brand span { display: block; color: #b8c1d3; font-size: 13px; margin-top: 3px; }

.card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 18px;
  padding: 18px;
}

.card h2 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0 0 14px; color: #cbd5e1; font-size: 14px; }

input, textarea, button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  font: inherit;
}

input, textarea {
  padding: 13px 14px;
  background: #fff;
  color: var(--text);
  outline: none;
}

textarea { resize: vertical; line-height: 1.55; }

button {
  padding: 13px 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  font-weight: 700;
  cursor: pointer;
  transition: .15s ease;
}

button:hover { background: var(--primary-dark); }
button:disabled { opacity: .6; cursor: not-allowed; }
button.secondary {
  background: #e8eef8;
  color: #1f2937;
}
button.secondary:hover { background: #d7e2f2; }
button.small { padding: 9px 12px; width: auto; font-size: 13px; }

.login-card input { margin-bottom: 10px; }
.hidden { display: none !important; }

.usage {
  background: rgba(255,255,255,.1);
  border-radius: 14px;
  padding: 12px;
  margin: 12px 0;
}
.usage span { display: block; color: #cbd5e1; font-size: 13px; }
.usage strong { display: block; margin-top: 4px; font-size: 20px; }

.sidebar-footer { margin-top: auto; color: #94a3b8; font-size: 13px; }

.main { padding: 34px; }
.hero {
  background: linear-gradient(135deg, #ffffff, #eaf1ff);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 26px;
  margin-bottom: 24px;
}
.hero h1 { margin: 0 0 8px; font-size: 32px; }
.hero p { margin: 0; color: var(--muted); }

.workspace {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 20px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
}
.panel-header h2 { margin: 0; font-size: 20px; }
.panel-header p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

.tools-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tool-card {
  text-align: left;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 16px;
  padding: 14px;
  cursor: pointer;
}
.tool-card:hover { border-color: var(--primary); background: var(--soft); }
.tool-card.active { border-color: var(--primary); background: var(--soft); }
.tool-card strong { display: block; margin-bottom: 4px; }
.tool-card span { display: block; color: var(--muted); font-size: 13px; line-height: 1.35; }
.tool-card small { display: block; color: var(--primary); margin-top: 8px; font-weight: 700; }

.composer-panel label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}
.actions {
  display: flex;
  gap: 12px;
  margin: 14px 0;
}
.actions button { width: auto; }

.status {
  min-height: 22px;
  margin: 8px 0 12px;
  color: var(--muted);
  font-size: 14px;
}
.status.error { color: var(--danger); }
.status.success { color: var(--success); }

.result-box {
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  background: #0b1220;
  color: #e6edf7;
}
.result-header {
  display: flex;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.result-header h3 { margin: 0; font-size: 15px; }
.result-header span { color: #94a3b8; font-size: 13px; }
pre {
  margin: 0;
  padding: 18px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.empty {
  color: var(--muted);
  padding: 18px;
  border: 1px dashed var(--border);
  border-radius: 16px;
}

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .workspace { grid-template-columns: 1fr; }
  .main { padding: 20px; }
}