/* ═══════════════════════════════════════════════════════════════════════════
   EasyPDF Lite — "Ledger" Theme
   A refined, editorial aesthetic inspired by classic financial stationery.
   Instrument Serif for display, DM Sans for body. Warm paper tones with
   a single amber accent. Hairline rules, embossed textures, deliberate
   asymmetry.
   ═══════════════════════════════════════════════════════════════════════════ */

/* === Tokens === */
:root {
  /* Paper palette */
  --paper:        #f5f0e8;
  --paper-warm:   #ece5d8;
  --paper-deep:   #e0d6c4;
  --ink:          #1c1917;
  --ink-light:    #57534e;
  --ink-faint:    #a8a29e;
  --ink-ghost:    #d6d3d1;

  /* Accent — warm amber, like a wax seal */
  --accent:       #c2853e;
  --accent-hover: #a16c2e;
  --accent-soft:  rgba(194, 133, 62, 0.12);
  --accent-glow:  rgba(194, 133, 62, 0.25);

  /* Functional */
  --danger:       #b91c1c;
  --danger-soft:  #fef2f2;
  --success:      #166534;
  --success-soft: #f0fdf4;
  --warning-bg:   #fefce8;
  --warning-border: #ca8a04;
  --warning-text: #854d0e;

  /* Surfaces */
  --card:         #fffdf8;
  --card-hover:   #fffcf2;
  --border:       #d4cdbf;
  --border-light: #e8e2d6;

  /* Radii — minimal, intentional */
  --r-sm: 3px;
  --r-md: 5px;
  --r-lg: 8px;

  /* Shadows — subtle, warm-toned */
  --shadow-xs:  0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow-sm:  0 1px 3px rgba(28, 25, 23, 0.06), 0 1px 2px rgba(28, 25, 23, 0.04);
  --shadow-md:  0 4px 6px -1px rgba(28, 25, 23, 0.06), 0 2px 4px -2px rgba(28, 25, 23, 0.04);
  --shadow-inset: inset 0 1px 2px rgba(28, 25, 23, 0.06);

  /* Typography — system fonts only, no external deps */
  --font-display: Georgia, 'Palatino Linotype', 'Book Antiqua', Palatino, serif;
  --font-body:    'Avenir Next', Avenir, 'Segoe UI', 'Helvetica Neue', Helvetica, sans-serif;
  --font-mono:    Menlo, Consolas, 'DejaVu Sans Mono', monospace;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  height: 100vh;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
}

/* Paper grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* === Header === */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1;
}

.logo-lite {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-left: 2px;
}

.tagline {
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  position: relative;
  padding-left: 14px;
}

.tagline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 14px;
  background: var(--border);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-light);
  text-decoration: none;
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  letter-spacing: 0.01em;
  transition: all 0.2s var(--ease-out);
  margin-right: 4px;
}

.gh-link:hover {
  color: var(--ink);
  border-color: var(--border);
  background: var(--accent-soft);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  border-radius: var(--r-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.btn:active::after { opacity: 0.06; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover:not(:disabled) {
  background: #292524;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}
.btn-outline:hover:not(:disabled) {
  border-color: var(--ink-light);
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}
.btn-danger:hover:not(:disabled) {
  background: #991b1b;
  transform: translateY(-1px);
}

.btn-sm {
  padding: 4px 12px;
  font-size: 0.75rem;
  border-radius: var(--r-sm);
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  color: var(--ink-faint);
  padding: 2px 6px;
  border-radius: var(--r-sm);
  transition: all 0.15s;
  line-height: 1;
}
.btn-icon:hover {
  background: var(--danger-soft);
  color: var(--danger);
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 0;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.15s;
  position: relative;
}
.btn-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  opacity: 0.3;
  transition: opacity 0.15s;
}
.btn-link:hover { color: var(--accent-hover); }
.btn-link:hover::after { opacity: 0.7; }

/* === Mobile Tabs === */
.mobile-tabs {
  display: none;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}

.mobile-tab {
  flex: 1;
  padding: 12px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  transition: all 0.2s;
}
.mobile-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* === Toast === */
.toast {
  position: fixed;
  top: 72px;
  right: 24px;
  padding: 12px 22px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--r-md);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  z-index: 200;
  box-shadow: var(--shadow-md);
  transition: opacity 0.35s var(--ease-out), transform 0.35s var(--ease-out);
  border-left: 3px solid var(--accent);
}
.toast.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px) scale(0.98);
}
.toast.success {
  background: var(--success);
  border-left-color: #22c55e;
}
.toast.error {
  background: var(--danger);
  border-left-color: #fca5a5;
}

/* === Main Layout === */
.app-main {
  display: grid;
  grid-template-columns: minmax(380px, 480px) 1fr;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* === Form Panel === */
.form-panel {
  overflow-y: auto;
  padding: 20px 18px;
  border-right: 1px solid var(--border);
  background: var(--paper);
  scrollbar-width: thin;
  scrollbar-color: var(--ink-ghost) transparent;
}

.form-panel::-webkit-scrollbar { width: 6px; }
.form-panel::-webkit-scrollbar-track { background: transparent; }
.form-panel::-webkit-scrollbar-thumb {
  background: var(--ink-ghost);
  border-radius: 3px;
}
.form-panel::-webkit-scrollbar-thumb:hover { background: var(--ink-faint); }

/* === Accordion (details/summary) === */
details {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--r-lg);
  margin-bottom: 14px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow 0.25s var(--ease-out);
  overflow: hidden;
}

details:hover { box-shadow: var(--shadow-sm); }

details[open] {
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}

summary {
  padding: 14px 18px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  transition: background 0.15s;
  list-style: none;
}

summary:hover { background: var(--accent-soft); }
summary::-webkit-details-marker { display: none; }

summary::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--ink-light);
  border-bottom: 1.5px solid var(--ink-light);
  transform: rotate(-45deg);
  margin-right: 12px;
  flex-shrink: 0;
  transition: transform 0.25s var(--ease-out);
}

details[open] > summary::before {
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.accordion-content {
  padding: 4px 18px 18px;
  animation: accordion-reveal 0.3s var(--ease-out);
}

@keyframes accordion-reveal {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.summary-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.profile-select {
  padding: 4px 10px;
  border: 1px solid var(--border-light);
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: 0.75rem;
  max-width: 170px;
  background: var(--card);
  color: var(--ink-light);
  transition: border-color 0.15s;
}
.profile-select:focus { border-color: var(--accent); outline: none; }

/* === Form Elements === */
.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.form-group {
  flex: 1;
  min-width: 150px;
}

.form-group.full-width {
  flex: 100%;
  min-width: 100%;
}

.form-group label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 5px;
  color: var(--ink-light);
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="number"],
input[type="date"],
textarea,
select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  font-family: var(--font-body);
  font-size: 0.85rem;
  background: var(--card);
  color: var(--ink);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  box-shadow: var(--shadow-inset);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-inset), 0 0 0 3px var(--accent-soft);
  background: #fffef9;
}

input:invalid:not(:focus) { border-color: var(--danger); }
textarea { resize: vertical; line-height: 1.5; }

input::placeholder,
textarea::placeholder {
  color: var(--ink-ghost);
  font-style: italic;
}

/* File input */
input[type="file"] {
  padding: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}

/* === Field Toggle (label + switch) === */
.field-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
}

/* === Toggle Switch === */
.switch {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 18px;
  flex-shrink: 0;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--ink-ghost);
  border-radius: 18px;
  transition: background 0.25s var(--ease-out);
}

.slider::before {
  content: '';
  position: absolute;
  height: 14px;
  width: 14px;
  left: 2px;
  bottom: 2px;
  background: white;
  border-radius: 50%;
  transition: transform 0.25s var(--ease-spring);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.switch input:checked + .slider { background: var(--accent); }
.switch input:checked + .slider::before { transform: translateX(16px); }

/* === Field Toggles (item column visibility) === */
.field-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin-bottom: 14px;
  padding: 10px 12px;
  background: var(--paper-warm);
  border-radius: var(--r-md);
  border: 1px solid var(--border-light);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.73rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  color: var(--ink-light);
  letter-spacing: 0.01em;
  transition: color 0.15s;
}
.toggle-label:hover { color: var(--ink); }
.vat-summary-toggles { margin-bottom: 10px; }

.toggle-label input[type="checkbox"] {
  width: 14px;
  height: 14px;
  cursor: pointer;
  accent-color: var(--accent);
  border-radius: 2px;
}

/* === Invoice Items === */
.invoice-item {
  background: var(--paper);
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  padding: 14px;
  margin-bottom: 10px;
  transition: border-color 0.2s, box-shadow 0.2s;
  position: relative;
}

.invoice-item:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-xs);
}

.invoice-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--accent);
  border-radius: 0 1px 1px 0;
  opacity: 0;
  transition: opacity 0.2s;
}
.invoice-item:hover::before { opacity: 1; }

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-light);
}

.item-number {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.item-fields {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
}

.item-field label {
  display: block;
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-bottom: 3px;
}

.item-field input {
  width: 100%;
  padding: 6px 8px;
  font-size: 0.82rem;
  border: 1px solid var(--border-light);
  border-radius: var(--r-sm);
  background: var(--card);
  box-shadow: var(--shadow-inset);
}

.item-field.computed span {
  display: block;
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--paper-warm);
  border: 1px solid var(--border-light);
  border-radius: var(--r-sm);
  min-height: 30px;
  line-height: 1.4;
  color: var(--ink);
}

.item-field[data-col="name"] { grid-column: span 2; }

/* === Total Row === */
.total-row {
  margin-top: 16px;
  padding: 14px 18px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--r-md);
  font-size: 1rem;
  text-align: right;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-md);
}

.total-row strong {
  font-weight: 500;
}

.total-row #total-display {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.total-row #total-currency {
  font-size: 0.82rem;
  opacity: 0.7;
  margin-left: 2px;
}

/* === Date Warning === */
.date-warning {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--r-md);
  font-size: 0.8rem;
  color: var(--warning-text);
  margin-top: 10px;
}

/* === Logo Preview === */
.logo-preview {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

.logo-preview img {
  max-width: 100px;
  max-height: 40px;
  object-fit: contain;
  border: 1px solid var(--border-light);
  border-radius: var(--r-sm);
}

/* === Preview Panel === */
.preview-panel {
  height: calc(100vh - 56px);
  overflow: hidden;
  background: var(--paper-deep);
  box-shadow: inset 2px 0 8px rgba(28, 25, 23, 0.04);
}

#pdf-preview {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  display: block;
}

/* === Form Footer === */
.form-footer {
  padding: 20px 0 12px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-light);
  letter-spacing: 0.02em;
}

.form-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}

.form-footer a:hover {
  color: var(--accent-hover);
}

/* === Hidden utility === */
.hidden { display: none !important; }

/* ═══════════════════════════════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  .app-header {
    padding: 0 14px;
    height: 50px;
  }

  .tagline { display: none; }
  .mobile-tabs { display: flex; }

  .app-main {
    height: calc(100vh - 92px);
    grid-template-columns: 1fr;
  }

  .preview-panel {
    height: calc(100vh - 92px);
  }

  .form-panel { border-right: none; }
  .preview-panel { display: none; }
  .preview-panel.active { display: block; }
  .form-panel.hidden-mobile { display: none; }

  .form-row { flex-direction: column; }
  .form-group { min-width: 100%; }
  .item-fields { grid-template-columns: 1fr 1fr; }
  .item-field[data-col="name"] { grid-column: span 2; }
  .dates-row { flex-direction: column; }
  .summary-actions { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .header-right .btn svg + span,
  .header-right .btn:not(:has(svg)) { font-size: 0; }
  .header-right .btn { padding: 8px 12px; }
  .gh-link span { display: none; }
  .gh-link { padding: 6px; margin-right: 0; }

  .item-fields { grid-template-columns: 1fr; }
  .item-field[data-col="name"] { grid-column: span 1; }

  .logo { font-size: 1.25rem; }
  .logo-lite { font-size: 0.75rem; }
}

/* === Print: hide everything except preview === */
@media print {
  .app-header,
  .mobile-tabs,
  .toast,
  .form-panel { display: none !important; }

  .app-main {
    grid-template-columns: 1fr;
    height: auto;
  }

  .preview-panel {
    box-shadow: none;
    background: white;
  }
}