:root {
  --bg: #f4efe6;
  --panel: rgba(255, 251, 245, 0.92);
  --line: #d8c9b4;
  --text: #2f241b;
  --muted: #6f5b49;
  --accent: #146356;
  --accent-strong: #0f4c42;
  --danger: #8e2f2f;
  --success: #1e6f3d;
  --shadow: 0 20px 45px rgba(74, 54, 33, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(20, 99, 86, 0.14), transparent 24rem),
    linear-gradient(180deg, #f7f0e7 0%, #f2e7d7 100%);
}

.page-shell {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.hero {
  padding: 2rem;
  border: 1px solid rgba(216, 201, 180, 0.7);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

h1, h2, h3 {
  margin-top: 0;
  font-family: "SUIT", "Pretendard", sans-serif;
}

.subtitle {
  max-width: 52rem;
  color: var(--muted);
  line-height: 1.7;
}

.grid {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.card {
  padding: 1.5rem;
  border-radius: 24px;
  border: 1px solid rgba(216, 201, 180, 0.8);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.stack {
  display: grid;
  gap: 0.85rem;
}

label {
  font-weight: 600;
}

select,
input[type="file"],
button {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  font: inherit;
}

button {
  border: none;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.03);
}

.alert {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 18px;
  font-weight: 600;
}

.alert-error {
  background: rgba(142, 47, 47, 0.12);
  color: var(--danger);
}

.alert-success {
  background: rgba(30, 111, 61, 0.12);
  color: var(--success);
}

.meta,
.placeholder {
  color: var(--muted);
}

.warning {
  color: var(--danger);
  font-weight: 700;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

pre {
  margin: 0;
  padding: 1rem;
  min-height: 18rem;
  border-radius: 18px;
  background: #f8f4ee;
  border: 1px solid rgba(216, 201, 180, 0.8);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  font-family: "IBM Plex Mono", monospace;
}

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