:root {
  --navy: #11213a;
  --navy-light: #1c3257;
  --teal: #1f8a70;
  --amber: #c98a1f;
  --red: #b4432f;
  --paper: #f7f5f0;
  --ink: #1b1b1b;
  --muted: #6b6a66;
  --border: #ddd8cc;
  --card-bg: #ffffff;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
}

.site-header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: #fff;
  padding: 2.5rem 1.5rem 2rem;
}

.header-inner {
  max-width: 920px;
  margin: 0 auto;
}

.site-header h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  color: #cdd6e4;
  font-size: 1.05rem;
  max-width: 640px;
}

.layout {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.sample-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.75rem;
}

.sample-buttons button {
  background: #eef2f8;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--navy);
}

.sample-buttons button:hover {
  background: #e1e9f4;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.88rem;
  font-weight: 600;
  gap: 0.35rem;
  color: #333;
}

label.checkbox-row {
  flex-direction: row;
  align-items: center;
  grid-column: 1 / -1;
  gap: 0.6rem;
  font-weight: 500;
}

input[type="text"],
input[type="number"],
select {
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 400;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

h3 {
  font-size: 1.02rem;
  margin: 1.25rem 0 0.6rem;
}

.addon-rows {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.addon-row {
  display: grid;
  grid-template-columns: 2fr 1fr auto;
  gap: 0.5rem;
  align-items: center;
}

.addon-row input {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.92rem;
}

.remove-row {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  color: var(--red);
}

button.secondary {
  background: #eef2f8;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font-size: 0.9rem;
  margin-top: 0.5rem;
  color: var(--navy);
}

button.primary {
  background: var(--teal);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.7rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button.primary:hover {
  background: #176d58;
}

.actions {
  margin-top: 1.25rem;
}

.result-block {
  margin-bottom: 1.5rem;
}

.result-block:last-child {
  margin-bottom: 0;
}

.verdict {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  margin-bottom: 0.6rem;
}

.verdict.ok { background: #e7f5ef; border: 1px solid #b9e0cd; }
.verdict.warn { background: #fbf1df; border: 1px solid #e9cf9d; }
.verdict.bad { background: #f8e4de; border: 1px solid #e5b7a9; }

.verdict strong { display: block; margin-bottom: 0.2rem; }

.addon-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 0.4rem;
}

.addon-table th, .addon-table td,
#reference-table th, #reference-table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.flag-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--amber);
  color: #fff;
}

textarea#letter {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: "SFMono-Regular", Consolas, Menlo, monospace;
  font-size: 0.85rem;
  resize: vertical;
}

#reference-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-top: 0.75rem;
}

#copy-confirm {
  margin-left: 0.6rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .addon-row { grid-template-columns: 1fr 1fr auto; }
  .site-header h1 { font-size: 1.6rem; }
}