:root {
  --bg: #0f1117;
  --panel: #171a23;
  --border: #2a2e3a;
  --text: #e8e9ee;
  --muted: #9aa0ac;
  --accent: #4f8cff;
  --accent-soft: rgba(79,140,255,.12);
}

* { box-sizing: border-box; }

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

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.cta, .cta-small, .cta-secondary {
  display: inline-block;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
}

.cta {
  background: var(--accent);
  color: #fff;
  padding: 14px 28px;
  font-size: 1rem;
}

.cta-small {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 8px 16px;
  font-size: .9rem;
}

.cta-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 20px;
  margin-left: 10px;
}

.hero-content {
  max-width: 720px;
  margin: 40px auto 80px;
  padding: 0 32px;
  text-align: center;
}

.hero-content h1 {
  font-size: 2.1rem;
  line-height: 1.25;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 20px 0 32px;
}

section {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 32px;
}

section h2 {
  text-align: center;
  margin-bottom: 32px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.card h3 { margin-top: 0; }
.card .note { color: var(--muted); font-size: .85rem; }

.feature-list {
  max-width: 640px;
  margin: 0 auto;
  padding-left: 20px;
}
.feature-list li { margin-bottom: 12px; }

footer {
  text-align: center;
  color: var(--muted);
  padding: 32px;
  font-size: .85rem;
}

/* --- App / invoice generator --- */

.app-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 32px 64px;
}

.form-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.form-panel h1 { font-size: 1.3rem; margin-top: 0; }

.form-panel label {
  display: block;
  margin-bottom: 14px;
  font-size: .85rem;
  color: var(--muted);
}

.form-panel input,
.form-panel select,
.form-panel textarea {
  width: 100%;
  margin-top: 6px;
  background: #0d0f15;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: .95rem;
  font-family: inherit;
}

.form-panel .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.hint {
  font-size: .78rem;
  color: var(--muted);
  margin-top: 16px;
}

.pro-box {
  margin-top: 18px;
  padding: 14px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  font-size: .85rem;
}
.pro-box .note { color: var(--muted); font-size: .75rem; }

.invoice-preview {
  background: #fff;
  color: #111;
  border-radius: 12px;
  padding: 40px;
  height: fit-content;
  position: relative;
  overflow: hidden;
}

.invoice-watermark {
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-30deg);
  font-size: 1.4rem;
  font-weight: 700;
  color: rgba(0, 0, 0, 0.08);
  white-space: nowrap;
  pointer-events: none;
}

.invoice-header p { margin: 2px 0; color: #555; }

.invoice-parties {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}
.invoice-parties p { margin: 2px 0; }

.invoice-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}
.invoice-table th, .invoice-table td {
  border-bottom: 1px solid #ddd;
  text-align: left;
  padding: 10px 4px;
}
.invoice-table .invoice-total-row td {
  font-weight: 700;
  border-bottom: none;
  border-top: 2px solid #111;
}
.invoice-table #rowIvaExempt td {
  font-size: .8rem;
  color: #555;
  font-style: italic;
  border-bottom: none;
  padding-top: 0;
}

.invoice-payment {
  background: #f4f6fb;
  border-radius: 8px;
  padding: 16px;
  font-size: .9rem;
}
.invoice-payment .address {
  font-family: "Courier New", monospace;
  word-break: break-all;
  margin: 6px 0 0;
}
.address-warning {
  color: #b3261e;
  font-weight: 600;
  font-size: .8rem;
  margin: 10px 0 0;
}
.address-warning:empty {
  display: none;
}

@media (max-width: 860px) {
  .app-layout { grid-template-columns: 1fr; }
}