/* Design Tokens */
:root {
  --color-brand-primary: #0B1F3B;
  --color-brand-secondary:#3C4A5D;
  --color-accent:         #2A7F8A;
  --color-surface:        #F5F7FA;
  --color-text-primary:   #0E1726;
  --color-text-secondary: #5B6675;
  --color-border:         #D6DCE3;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 24px rgba(0,0,0,.12);
  --font-sans: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 24px; --space-6: 32px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #0d1117;
    --color-text-primary: #e6edf3;
    --color-text-secondary: #a3b1c2;
    --color-border: #1f232a;
  }
}

html, body { height: 100%; }
body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container { max-width: 1120px; margin: 0 auto; padding: 0 var(--space-4); }
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}
.brand { display:flex; align-items:center; gap: var(--space-3); font-weight: 600; color: var(--color-brand-primary); }
.brand img { width: 28px; height: 28px; }
.nav a { color: var(--color-text-secondary); text-decoration: none; margin-left: var(--space-4); }
.nav a:hover { color: var(--color-text-primary); }

.card {
  background: #fff;
  color: #111;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}
@media (prefers-color-scheme: dark) {
  .card { background: #11161d; color: #e6edf3; }
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 16px; border-radius: var(--radius-md);
  border: 1px solid transparent; cursor: pointer; font-weight: 600;
  transition: transform .06s ease, box-shadow .2s ease, background-color .2s ease, color .2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--color-brand-primary); color: #fff; }
.btn-primary:hover { box-shadow: var(--shadow-md); }
.btn-secondary { background: #fff; color: var(--color-brand-primary); border-color: var(--color-border); }
@media (prefers-color-scheme: dark) {
  .btn-secondary { background: #11161d; color: #e6edf3; }
}

.input, .select {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--color-border); background: #fff; color: #111;
}
@media (prefers-color-scheme: dark) {
  .input, .select { background: #0f141b; color: #e6edf3; }
}

.form-row { display: grid; gap: var(--space-4); grid-template-columns: 1fr 1fr; }
@media (max-width: 720px) { .form-row { grid-template-columns: 1fr; } }

/* Loaders (CSS only) */
.loader-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.22);
  display: none; align-items: center; justify-content: center; z-index: 9999;
}
.loader-overlay.active { display: flex; }

.loader-spinner {
  width: 48px; height: 48px; border-radius: 50%;
  border: 4px solid rgba(255,255,255,.25);
  border-top-color: var(--color-accent);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loader-dots {
  display: inline-flex; gap: 8px; align-items: center; justify-content: center;
}
.loader-dots > i {
  width: 8px; height: 8px; border-radius: 50%; background: var(--color-accent);
  opacity: .3; animation: blink 1.2s infinite ease-in-out;
}
.loader-dots > i:nth-child(2) { animation-delay: .2s; }
.loader-dots > i:nth-child(3) { animation-delay: .4s; }
@keyframes blink {
  0%, 80%, 100% { opacity: .2; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .loader-spinner, .loader-dots > i { animation: none; }
}

/* Utility */
.hidden { display: none !important; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.center { display:flex; align-items:center; justify-content:center; }
footer {
  position: fixed;
  bottom: 0;
  text-align: center;
  width: 100%;
}
.container.invoice-missing {
  display: flex;
  max-width: 1280px;
  justify-content: center;
  flex-direction: column;
  align-items: center;
  margin: auto;
  padding: 20px;
  border: 1px solid #030303;
  border-radius: 15px;
  gap: 15px;
}
.invoice-missing h1 {
  font-weight: 600;
  font-size: 28px;
}
.invoice-missing p {
  font-size: 16px;
  color: var(--color-text-secondary);
  text-align: center;
}
.invoice-missing .contact-info {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
  text-align: center;
}
.invoice-missing .reasons h3 {
  margin-bottom: 8px;
}
.invoice-missing .reasons ul {
  list-style-type: disc;
  padding-left: 20px;
}
.invoice-missing .reasons ul li {
  margin-bottom: 6px;
}