:root {
  --bg: #fff;
  --fg: #1f2937;
  --mute: #6b7280;
  --border: #e5e7eb;
  --hover: #f3f4f6;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --success: #16a34a;
  --error: #dc2626;
  --warning-bg: #fef3c7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --fg: #f9fafb;
    --mute: #9ca3af;
    --border: #374151;
    --hover: #1f2937;
    --accent: #60a5fa;
    --accent-dark: #3b82f6;
    --success: #34d399;
    --warning-bg: #422006;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  font-size: 15px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header .logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}
.user-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-link {
  color: var(--mute);
  text-decoration: none;
  font-size: 14px;
}
.nav-link:hover { color: var(--fg); }
.btn-small { padding: 4px 12px; font-size: 12px; }

main { padding: 32px 0; }

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 48px;
}

h1 { font-size: 24px; margin-bottom: 12px; }
h2 { font-size: 18px; margin: 24px 0 12px; }
h3 { font-size: 15px; margin: 16px 0 8px; }

.hero {
  text-align: center;
  padding: 48px 0;
}
.hero h1 { font-size: 28px; }
.hero .subtitle {
  color: var(--mute);
  font-size: 16px;
  margin: 12px 0 24px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 32px 0;
}
.feature {
  background: var(--hover);
  padding: 20px;
  border-radius: 8px;
}
.feature h3 { margin-top: 0; }
.feature p { color: var(--mute); font-size: 14px; }

.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary {
  background: var(--hover);
  color: var(--fg);
  border: 1px solid var(--border);
}
.btn-large { padding: 14px 32px; font-size: 17px; }

.form-group {
  margin: 16px 0;
}
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 14px;
}
.form-group input[type="file"] {
  display: block;
  padding: 10px;
  border: 2px dashed var(--border);
  border-radius: 6px;
  width: 100%;
  background: var(--hover);
}

.htmx-indicator {
  display: none;
  color: var(--mute);
  padding: 12px 0;
}
.htmx-request .htmx-indicator { display: block; }

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.result-card {
  background: var(--hover);
  padding: 16px;
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}
.result-card.highlight { border-left-color: var(--success); }
.result-label {
  font-size: 12px;
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.result-value {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}
.comparison-table th,
.comparison-table td {
  padding: 10px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
.comparison-table th {
  font-size: 12px;
  color: var(--mute);
  text-transform: uppercase;
}
.comparison-table th:first-child,
.comparison-table td:first-child { text-align: left; }
.optimal-row { font-weight: 700; color: var(--success); }

.cta-box {
  background: var(--hover);
  padding: 24px;
  border-radius: 8px;
  text-align: center;
  margin: 24px 0;
}
.cta-box p { margin-bottom: 16px; }

.payment-info {
  background: var(--hover);
  padding: 16px;
  border-radius: 8px;
  margin: 16px 0;
}

.qr-box {
  text-align: center;
  padding: 24px;
  background: var(--hover);
  border-radius: 8px;
  margin: 16px 0;
}
.qr-box img { background: white; padding: 12px; border-radius: 6px; }

.check-payment {
  text-align: center;
  margin: 24px 0;
}

.success-box {
  text-align: center;
  padding: 32px 0;
}
.success-box p { margin-bottom: 20px; }
.output-list {
  text-align: left;
  max-width: 500px;
  margin: 24px auto 0;
}
.output-list ul { list-style: none; padding: 0; }
.output-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.output-list code {
  background: var(--hover);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 13px;
}

.error-box {
  background: #fef2f2;
  border-left: 4px solid var(--error);
  padding: 20px;
  border-radius: 6px;
  margin: 16px 0;
}

.disclaimer, .disclaimer-box {
  color: var(--mute);
  font-size: 12px;
  line-height: 1.5;
}
.disclaimer-box {
  background: var(--warning-bg);
  padding: 14px;
  border-radius: 6px;
  margin-top: 32px;
  border-left: 3px solid #f59e0b;
}

.loading {
  text-align: center;
  padding: 40px 0;
  color: var(--mute);
}
.spinner-bar {
  width: 200px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 16px auto 0;
  overflow: hidden;
  position: relative;
}
.spinner-bar::after {
  content: "";
  position: absolute;
  width: 40%;
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  animation: slide 1.2s ease-in-out infinite;
}
@keyframes slide {
  0% { left: -40%; }
  100% { left: 100%; }
}

details { margin: 8px 0; }
summary {
  cursor: pointer;
  padding: 10px;
  background: var(--hover);
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
}
details[open] summary { margin-bottom: 8px; }
details p { padding: 4px 10px; font-size: 14px; color: var(--mute); }

.pricing {
  background: var(--hover);
  padding: 24px;
  border-radius: 8px;
  margin: 24px 0;
}