:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-soft: #eef3fa;
  --card: #ffffff;
  --text: #1f2a44;
  --muted: #667694;
  --accent: #2f6fed;
  --accent-hover: #255ed2;
  --border: #dbe4f0;
  --input-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(circle at top, #f9fbfe 0%, var(--bg-soft) 35%, var(--bg) 100%);
  color: var(--text);
}

.app {
  width: min(1100px, 92vw);
  margin: 40px auto;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.hero p {
  margin: 10px 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 10px 30px rgba(31, 42, 68, 0.08);
}

.form-card {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.row-small {
  margin-top: 8px;
}

input[type="url"] {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  border-radius: 10px;
  padding: 12px;
  outline: none;
}

input[type="url"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(47, 111, 237, 0.14);
}

button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 11px 16px;
  color: #ffffff;
  background: var(--accent);
  cursor: pointer;
  font-weight: 700;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.08s ease;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.btn-secondary {
  color: #2f4b76;
  background: #eef3fb;
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: #e5edf9;
  border-color: #c9d8ee;
}

.btn-icon {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr 1fr;
}

.app-footer {
  margin-top: 22px;
  padding: 12px 0 2px;
  display: flex;
  justify-content: center;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.18s ease;
}

.github-link:hover {
  color: var(--accent);
}

.github-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 10px;
}

.preview {
  margin: 0;
  max-height: 380px;
  overflow: auto;
  background: #f8fbff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  white-space: pre-wrap;
  word-break: break-word;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
}