:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --error: #dc2626;
  --warn: #d97706;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

header {
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  margin-bottom: 20px;
}

.card.info ul {
  margin: 12px 0 0;
}

.file-input {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border: 1px dashed #cbd5f5;
  border-radius: 12px;
  margin-bottom: 16px;
  cursor: pointer;
}

.file-input input {
  flex: 1;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  color: var(--muted);
  gap: 6px;
}

input[type="number"],
input[type="file"] {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  font-size: 1rem;
}

button {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 1rem;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

.alert {
  padding: 16px;
  border-radius: 12px;
  margin-bottom: 20px;
  background: #fff;
}

.alert-error {
  border-left: 4px solid var(--error);
}

.alert-warn {
  border-left: 4px solid var(--warn);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.metrics .label {
  display: block;
  color: var(--muted);
  margin-bottom: 6px;
}

.hint {
  color: var(--muted);
  margin: 8px 0 0;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}