:root {
  --ink: #1b1f24;
  --muted: #6a7280;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --brand: #0f766e;
  --brand-2: #115e59;
  --edge: #d8e0e8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 0%, #e7f8f6 0%, #fbfaf7 42%, #f5efe6 100%);
}

.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 18px;
}

.hero {
  background: linear-gradient(135deg, #0f766e, #1f9e95);
  color: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(15, 118, 110, 0.2);
}

.hero h1 {
  margin: 0 0 8px;
}

.hero p {
  margin: 0;
  opacity: 0.95;
}

.panel {
  background: var(--panel);
  border-radius: 14px;
  border: 1px solid var(--edge);
  padding: 18px;
}

label {
  font-weight: 700;
  display: block;
  margin-top: 10px;
  margin-bottom: 6px;
}

textarea {
  width: 100%;
  border: 1px solid #c7d0db;
  border-radius: 10px;
  padding: 12px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  resize: vertical;
}

input,
select {
  width: 100%;
  border: 1px solid #c7d0db;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  background: #fff;
}

.mode-panel {
  margin-top: 10px;
}

.mode-panel input + label,
.mode-panel textarea + label {
  margin-top: 10px;
}

.hidden {
  display: none;
}

.button-row {
  margin-top: 14px;
  display: flex;
  gap: 10px;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
  color: #fff;
  background: var(--brand);
}

button:hover {
  background: var(--brand-2);
}

button.secondary {
  color: var(--ink);
  background: #e7eef6;
}

.status {
  color: var(--muted);
  margin-bottom: 12px;
  font-weight: 700;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

h2, h3 {
  margin-top: 0;
}

pre {
  background: #0d1117;
  color: #d8fbe6;
  border-radius: 10px;
  padding: 10px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

button.tiny {
  padding: 6px 10px;
  font-size: 12px;
  border-radius: 8px;
}

.history-note {
  margin: 4px 0 10px;
  color: var(--muted);
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.history-item,
.history-empty {
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: 10px;
  background: #f9fbfd;
}

.history-summary {
  font-family: Consolas, "Courier New", monospace;
  font-size: 12px;
  margin-bottom: 8px;
  overflow-wrap: anywhere;
}

.history-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .app-shell {
    padding: 14px;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }
}