*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d0d14;
  --surface:    #16161f;
  --border:     #2a2a3a;
  --accent:     #1c69d4;
  --accent-dim: #1050a0;
  --text:       #e0e0ec;
  --text-dim:   #8888a0;
  --warn:       #c0782a;
  --success:    #2a7a4a;
  --radius:     8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html { background: var(--bg); color: var(--text); font-family: var(--font); font-size: 16px; }
body { min-height: 100vh; display: flex; flex-direction: column; }

/* ── Layout ────────────────────────────────────────────────── */

header {
  border-bottom: 1px solid var(--border);
  padding: 2rem 1.5rem 1.5rem;
  text-align: center;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
}

header p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

main {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  line-height: 1.6;
}

/* ── Input card ────────────────────────────────────────────── */

.input-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field { display: flex; flex-direction: column; gap: 0.4rem; }

label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  padding: 0.65rem 0.85rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}

input[type="text"]:focus { border-color: var(--accent); }
input[type="text"]::placeholder { color: var(--text-dim); opacity: 0.6; }

.field-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.field-hint strong { color: var(--text); }

details.how-to { margin-top: 0.25rem; }

details.how-to summary {
  font-size: 0.8rem;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

details.how-to summary::before { content: '+ '; }
details[open].how-to summary::before { content: '− '; }

details.how-to .how-to-body {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 0.6rem;
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

details.how-to .how-to-body strong { color: var(--text); }
details.how-to .how-to-body code {
  background: #222230;
  border-radius: 3px;
  padding: 0.1em 0.35em;
  font-size: 0.85em;
  color: #a0c4ff;
}

/* ── Result ────────────────────────────────────────────────── */

#result { display: flex; flex-direction: column; gap: 1rem; }

.vin-info {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: #1c2a3a;
  border: 1px solid #2a4060;
  border-radius: 4px;
  color: #80b4e8;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2em 0.6em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.vin-note {
  width: 100%;
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin-top: 0.1rem;
}

.warn {
  background: #1e140a;
  border: 1px solid #3a2510;
  border-radius: var(--radius);
  color: #d4904a;
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 0.75rem 1rem;
}

.no-match {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
  padding: 1.25rem;
}

.no-match p + p { margin-top: 0.5rem; }

.prompt {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 1rem 1.25rem;
}

/* ── Match card ────────────────────────────────────────────── */

.match {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.match-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.file-name {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.date {
  font-size: 0.78rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.match-desc {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.6;
}

.match-detail {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  padding: 0.75rem 1rem;
}

.match-detail > div {
  display: flex;
  gap: 0.75rem;
  font-size: 0.82rem;
  line-height: 1.5;
}

.label {
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 6.5rem;
}

.value { color: var(--text); }

.download-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-download, .btn-pdf {
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.btn-download {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  flex: 1;
  text-align: center;
  min-width: 180px;
}

.btn-download:hover { background: var(--accent-dim); border-color: var(--accent-dim); }

.btn-pdf {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.btn-pdf:hover { border-color: var(--text-dim); color: var(--text); }

/* ── Install guide ─────────────────────────────────────────── */

details.install-guide {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

details.install-guide summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  padding: 0.85rem 1.1rem;
  user-select: none;
  list-style: none;
}

details.install-guide summary::after { content: ' ↓'; }
details[open].install-guide summary::after { content: ' ↑'; }

details.install-guide ol {
  border-top: 1px solid var(--border);
  color: var(--text);
  counter-reset: step;
  font-size: 0.88rem;
  line-height: 1.7;
  list-style: none;
  padding: 1rem 1.1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

details.install-guide li {
  counter-increment: step;
  display: flex;
  gap: 0.75rem;
}

details.install-guide li::before {
  content: counter(step);
  background: #1c2a3a;
  border-radius: 50%;
  color: #80b4e8;
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 700;
  height: 1.5rem;
  line-height: 1.5rem;
  text-align: center;
  width: 1.5rem;
  margin-top: 0.1rem;
}

details.install-guide strong { color: var(--text); }

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 500px) {
  header { padding: 1.5rem 1rem 1rem; }
  header h1 { font-size: 1.2rem; }
  main { padding: 1.25rem 1rem; }
  .download-buttons { flex-direction: column; }
  .btn-download { min-width: unset; }
}