/* ═══════════════════════════════════════════════════
   INVOICEGEN — Design System & Dark/Red Theme
   ═══════════════════════════════════════════════════ */

/* ── 1. Design Tokens ──────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-base:      #0a0a0a;
  --bg-surface:   #121212;
  --bg-elevated:  #1a1a1a;
  --bg-input:     #1f1f1f;
  --bg-hover:     #252525;

  /* Red Accent */
  --red:          #e03131;
  --red-dim:      #c92a2a;
  --red-deep:     #b02020;
  --red-glow:     rgba(224, 49, 49, 0.18);
  --red-glow-sm:  rgba(224, 49, 49, 0.10);
  --red-border:   rgba(224, 49, 49, 0.35);

  /* Text */
  --text-primary:  #f0f0f0;
  --text-secondary:#a0a0a0;
  --text-muted:    #5a5a5a;
  --text-disabled: #3a3a3a;

  /* Borders */
  --border:        #242424;
  --border-light:  #2e2e2e;
  --border-focus:  var(--red);

  /* Shadows */
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.4);
  --shadow-md:     0 4px 20px rgba(0,0,0,0.5);
  --shadow-lg:     0 8px 40px rgba(0,0,0,0.6);
  --glow-red:      0 0 0 3px var(--red-glow), 0 0 20px var(--red-glow-sm);

  /* Typography */
  --font-sans:     'Inter', system-ui, -apple-system, sans-serif;
  --font-display:  'Space Grotesk', var(--font-sans);

  /* Spacing */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   22px;

  /* Transitions */
  --t-fast:  0.15s ease;
  --t-base:  0.25s ease;
  --t-slow:  0.4s ease;

  /* Layout */
  --header-h:    64px;
  --form-w:      420px;
}

/* ── 2. Reset & Base ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── 3. Scrollbar ──────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb { background: #333; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #444; }

/* ── 4. Header ─────────────────────────────────────── */
.app-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  animation: slideDown 0.5s var(--t-slow) both;
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}

.header-brand {
  display: flex; align-items: center; gap: 12px;
}

.brand-icon {
  transition: transform var(--t-base);
}
.brand-icon:hover { transform: scale(1.08) rotate(-3deg); }

.brand-text {
  display: flex; flex-direction: column; gap: 1px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.2rem; font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-tagline {
  font-size: 0.7rem; font-weight: 400;
  color: var(--text-muted); letter-spacing: 0.05em;
  text-transform: uppercase;
}

.header-controls {
  display: flex; align-items: center; gap: 10px;
}

/* Currency Select */
.currency-wrapper { position: relative; }

.currency-select {
  appearance: none;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 8px 32px 8px 12px;
  font-family: var(--font-sans);
  font-size: 0.82rem; font-weight: 500;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10' fill='none'%3E%3Cpath d='M2 3.5l3 3 3-3' stroke='%23888' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.currency-select:hover { border-color: var(--red-border); background-color: var(--bg-hover); }
.currency-select:focus { outline: none; border-color: var(--red); box-shadow: var(--glow-red); }
.currency-select option { background: var(--bg-elevated); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 16px;
  border: none; border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.84rem; font-weight: 500;
  cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap; text-decoration: none;
}

.btn-primary {
  background: var(--red);
  color: #fff;
  box-shadow: 0 2px 12px rgba(224,49,49,0.25);
}
.btn-primary:hover {
  background: var(--red-dim);
  box-shadow: 0 4px 20px rgba(224,49,49,0.4);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}
.btn-ghost:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.btn-outline {
  background: transparent;
  color: var(--red);
  border: 1px dashed var(--red-border);
}
.btn-outline:hover {
  background: var(--red-glow-sm);
  border-color: var(--red);
  border-style: solid;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
}

.btn svg { flex-shrink: 0; }

/* ── 5. App Layout ─────────────────────────────────── */
.app-main {
  display: grid;
  grid-template-columns: var(--form-w) 1fr;
  height: calc(100vh - var(--header-h));
  margin-top: var(--header-h);
  overflow: hidden;
}

/* ── 6. Form Panel ─────────────────────────────────── */
.form-panel {
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  padding: 12px 0 80px;
  scrollbar-width: thin;
  scrollbar-color: #333 var(--bg-surface);
}

/* Form Sections */
.form-section {
  border-bottom: 1px solid var(--border);
  animation: fadeUp 0.5s var(--t-slow) both;
}

.form-section:nth-child(1) { animation-delay: 0.05s; }
.form-section:nth-child(2) { animation-delay: 0.1s;  }
.form-section:nth-child(3) { animation-delay: 0.15s; }
.form-section:nth-child(4) { animation-delay: 0.2s;  }
.form-section:nth-child(5) { animation-delay: 0.25s; }
.form-section:nth-child(6) { animation-delay: 0.3s;  }
.form-section:nth-child(7) { animation-delay: 0.35s; }

@keyframes fadeUp {
  from { transform: translateY(16px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* Section Header (accordion toggle) */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 15px 20px;
  background: none; border: none;
  cursor: pointer;
  transition: background var(--t-fast);
  text-align: left;
}

.section-header:hover { background: var(--bg-elevated); }

.form-section.open .section-header {
  background: linear-gradient(90deg, rgba(224,49,49,0.06) 0%, transparent 100%);
  border-left: 2px solid var(--red);
}

.section-title {
  display: flex; align-items: center; gap: 10px;
}

.section-num {
  font-family: var(--font-display);
  font-size: 0.68rem; font-weight: 700;
  color: var(--red);
  letter-spacing: 0.08em;
  background: var(--red-glow-sm);
  border: 1px solid var(--red-border);
  padding: 2px 7px; border-radius: 20px;
  flex-shrink: 0;
}

.section-icon {
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: color var(--t-fast);
}
.form-section.open .section-icon { color: var(--red); }

.section-title > span:last-child {
  font-family: var(--font-display);
  font-size: 0.9rem; font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.chevron {
  color: var(--text-muted);
  transition: transform var(--t-base), color var(--t-fast);
  flex-shrink: 0;
}
.form-section.open .chevron {
  transform: rotate(180deg);
  color: var(--red);
}

/* Section Body (accordion collapse) */
.section-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              padding 0.3s ease,
              opacity 0.3s ease;
  opacity: 0;
  padding: 0 20px;
}

.form-section.open .section-body {
  max-height: 2000px;
  opacity: 1;
  padding: 4px 20px 20px;
}

/* ── 7. Form Controls ──────────────────────────────── */
.form-group {
  display: flex; flex-direction: column; gap: 6px;
  margin-bottom: 14px;
}
.form-group:last-child { margin-bottom: 0; }

.form-row { display: flex; gap: 12px; }
.form-row.two-col > .form-group { flex: 1; min-width: 0; }

label {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.tag-optional {
  font-size: 0.68rem; font-weight: 400;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  padding: 1px 6px; border-radius: 20px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
input[type="number"],
textarea {
  width: 100%;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
  resize: vertical;
}

input[type="date"] { cursor: pointer; color-scheme: dark; }
input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

input::placeholder, textarea::placeholder { color: var(--text-muted); font-size: 0.8rem; }

input:hover, textarea:hover {
  border-color: #3a3a3a;
  background: #222;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--red);
  box-shadow: var(--glow-red);
  background: #1e1e1e;
}

textarea { min-height: 60px; line-height: 1.5; }

/* ── 8. Logo Upload ────────────────────────────────── */
.logo-upload-area {
  width: 100%;
  border: 2px dashed var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  cursor: pointer;
  transition: border-color var(--t-base), background var(--t-fast);
  overflow: hidden;
  min-height: 80px;
  display: flex; align-items: center; justify-content: center;
}

.logo-upload-area:hover {
  border-color: var(--red-border);
  background: rgba(224,49,49,0.04);
}

.logo-upload-area.drag-over {
  border-color: var(--red);
  background: var(--red-glow);
  box-shadow: var(--glow-red);
}

.logo-placeholder {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 20px;
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--t-fast);
}
.logo-upload-area:hover .logo-placeholder { color: var(--text-secondary); }

.logo-placeholder span { font-size: 0.8rem; }
.logo-hint { font-size: 0.7rem !important; color: var(--text-disabled); }

.logo-preview-wrapper {
  position: relative; width: 100%; padding: 12px;
  display: flex; align-items: center; justify-content: center;
}

.logo-preview-img {
  max-height: 80px; max-width: 200px;
  object-fit: contain; border-radius: 4px;
}

.logo-remove-btn {
  position: absolute; top: 6px; right: 6px;
  background: rgba(0,0,0,0.6);
  color: #fff; border: none;
  width: 22px; height: 22px; border-radius: 50%;
  cursor: pointer; font-size: 0.7rem;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t-fast);
}
.logo-remove-btn:hover { background: var(--red); }

.hidden { display: none !important; }

/* ── 9. Bullets ────────────────────────────────────── */
.bullets-container {
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 10px;
}

.bullet-row {
  display: flex; align-items: center; gap: 8px;
  animation: fadeUp 0.2s ease both;
}

.bullet-prefix {
  font-size: 1.1rem; color: var(--red);
  flex-shrink: 0; line-height: 1;
}

.bullet-row input {
  flex: 1;
  padding: 7px 10px;
  font-size: 0.82rem;
}

.bullet-remove-btn {
  background: none; border: none;
  color: var(--text-muted);
  cursor: pointer; padding: 4px;
  border-radius: 4px;
  font-size: 1rem;
  transition: color var(--t-fast), background var(--t-fast);
  flex-shrink: 0;
}
.bullet-remove-btn:hover { color: var(--red); background: var(--red-glow-sm); }

/* ── 10. Line Items ────────────────────────────────── */
.items-table-wrapper {
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.items-col-header {
  display: grid;
  grid-template-columns: 1fr 90px 70px 100px 32px;
  gap: 8px; padding: 8px 10px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  font-size: 0.7rem; font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.06em;
}

.items-container { padding: 6px; display: flex; flex-direction: column; gap: 6px; }

.item-row {
  display: grid;
  grid-template-columns: 1fr 90px 70px 100px 32px;
  gap: 8px; align-items: center;
  animation: fadeUp 0.2s ease both;
}

.item-row input {
  padding: 7px 8px;
  font-size: 0.8rem;
  border-radius: 6px;
}

.item-row .item-calc {
  padding: 7px 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.item-del-btn {
  background: none; border: none;
  color: var(--text-muted);
  cursor: pointer; width: 28px; height: 28px;
  border-radius: 6px; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: color var(--t-fast), background var(--t-fast);
}
.item-del-btn:hover { color: var(--red); background: var(--red-glow-sm); }

.items-totals {
  margin-top: 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.total-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 14px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
.total-row:last-child { border-bottom: none; }

.total-row.grand {
  font-family: var(--font-display);
  font-size: 0.92rem; font-weight: 700;
  color: var(--red);
  background: var(--red-glow-sm);
}

/* ── 11. Preview Panel ─────────────────────────────── */
.preview-panel {
  display: flex; flex-direction: column;
  background: #111;
  overflow: hidden;
}

.preview-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px;
  background: rgba(18,18,18,0.9);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  backdrop-filter: blur(10px);
}

.preview-label-group {
  display: flex; align-items: center; gap: 8px;
}

.preview-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 8px var(--red);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--red); }
  50%       { opacity: 0.5; box-shadow: 0 0 3px var(--red); }
}

.preview-label {
  font-family: var(--font-display);
  font-size: 0.82rem; font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em; text-transform: uppercase;
}

.preview-toolbar-actions { display: flex; align-items: center; gap: 12px; }

.preview-hint {
  font-size: 0.72rem; color: var(--text-muted);
  display: none;
}
@media (min-width: 1100px) { .preview-hint { display: block; } }

.preview-scroll-area {
  flex: 1; overflow: auto;
  padding: 32px 24px;
  display: flex; justify-content: center;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(224,49,49,0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(224,49,49,0.03) 0%, transparent 50%),
    #0d0d0d;
}

/* ── 12. Invoice Preview (white paper) ─────────────── */
.invoice-preview {
  background: #ffffff;
  width: 680px;
  min-height: 940px;
  border-radius: 4px;
  padding: 48px 56px;
  box-shadow:
    0 2px 4px rgba(0,0,0,0.08),
    0 8px 32px rgba(0,0,0,0.5),
    0 24px 80px rgba(0,0,0,0.4);
  font-family: 'Inter', Arial, sans-serif;
  font-size: 13px;
  color: #1a1a1a;
  line-height: 1.55;
  position: relative;
  animation: paperFadeIn 0.6s ease both;
}

@keyframes paperFadeIn {
  from { transform: translateY(20px) scale(0.98); opacity: 0; }
  to   { transform: translateY(0) scale(1);       opacity: 1; }
}

/* Invoice title bar */
.inv-title-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px solid #1a1a1a;
}

.inv-logo-area {
  min-width: 100px; max-width: 200px;
}

.prev-logo {
  max-height: 60px; max-width: 160px;
  object-fit: contain;
}

.inv-main-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 28px; font-weight: 800;
  letter-spacing: 0.12em;
  color: #1a1a1a;
  text-transform: uppercase;
  text-align: right;
}

/* Meta */
.inv-meta {
  display: flex; flex-direction: column; gap: 3px;
  margin-bottom: 16px;
}

.inv-meta-item {
  display: flex; gap: 8px;
  font-size: 12.5px;
}

.inv-meta-key {
  font-weight: 600; color: #333;
  min-width: 110px; flex-shrink: 0;
}

.inv-meta-val { color: #444; }

/* Parties */
.inv-parties {
  display: flex; flex-direction: column; gap: 6px;
  margin-bottom: 16px;
}

.inv-party {
  display: flex; gap: 8px;
  font-size: 12.5px; align-items: baseline;
}

.inv-party-key {
  font-weight: 600; color: #333;
  min-width: 44px; flex-shrink: 0;
}

.inv-party-val {
  color: #444;
  white-space: pre-line;
}

/* Subject */
.inv-subject-row {
  margin-bottom: 20px;
  font-size: 12.5px;
  display: flex; gap: 6px;
}

.inv-subject-key { font-weight: 600; color: #333; flex-shrink: 0; }
.inv-subject-val { color: #222; font-weight: 500; }

/* Description */
.inv-desc-section { margin-bottom: 20px; }

.inv-desc-para {
  font-size: 12.5px; color: #333;
  line-height: 1.65; white-space: pre-line;
  margin-bottom: 10px;
}

.inv-bullets {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 4px;
}

.inv-bullets li {
  font-size: 12.5px; color: #333;
  padding-left: 14px; position: relative;
}
.inv-bullets li::before {
  content: "•"; position: absolute; left: 0;
  color: #333; font-weight: 700;
}

/* Line Items Table */
.inv-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 12.5px;
}

.inv-table thead tr {
  background: #1a1a1a;
  color: #ffffff;
}

.inv-table th {
  padding: 9px 10px;
  text-align: left;
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: 0.02em;
}

.inv-th-desc { width: 40%; }
.inv-th-num  { width: 15%; text-align: right; }

.inv-table td {
  padding: 8px 10px;
  border-bottom: 1px solid #e8e8e8;
  color: #333;
}

.inv-table td:not(:first-child) { text-align: right; }

.inv-table tbody tr:nth-child(even) { background: #f9f9f9; }

.inv-empty-row td { color: #aaa !important; font-style: italic; }

/* Table footer */
.inv-tfoot-row { }

.inv-tfoot-label {
  text-align: right !important;
  padding: 7px 10px;
  font-size: 12.5px;
  color: #444;
  border-top: 1px solid #e0e0e0;
}

.inv-tfoot-val {
  text-align: right;
  padding: 7px 10px;
  color: #222;
  font-variant-numeric: tabular-nums;
  border-top: 1px solid #e0e0e0;
  white-space: nowrap;
}

.inv-grand .inv-grand-label {
  font-weight: 700; color: #1a1a1a;
  border-top: 2px solid #1a1a1a;
  font-size: 13px;
}

.inv-grand .inv-grand-val {
  font-weight: 700; color: #1a1a1a;
  font-size: 14px;
  border-top: 2px solid #1a1a1a;
}

/* Payment Details */
.inv-payment {
  margin-bottom: 28px;
  padding: 14px 0;
  border-top: 1px solid #ddd;
  display: flex; flex-direction: column; gap: 5px;
}

.inv-pay-row {
  display: flex; gap: 8px;
  font-size: 12.5px; align-items: baseline;
  flex-wrap: wrap;
}

.inv-pay-key {
  font-weight: 600; color: #333;
  min-width: 115px; flex-shrink: 0;
}

.inv-pay-val { color: #444; }

.inv-pay-note {
  color: #888; font-size: 11.5px;
  margin-left: 4px;
}
.inv-pay-note:not(:empty)::before { content: "("; }
.inv-pay-note:not(:empty)::after  { content: ")"; }

/* Closing */
.inv-closing {
  margin-top: 4px;
  padding-top: 20px;
  border-top: 1px solid #ddd;
}

.inv-closing-msg {
  font-size: 12.5px; color: #333;
  margin-bottom: 20px;
  white-space: pre-line;
}

.inv-signoff {
  display: flex; flex-direction: column; gap: 4px;
}

.inv-sincerely {
  font-size: 12.5px; color: #333;
}

.inv-signoff-name {
  font-size: 14px; font-weight: 600;
  color: #1a1a1a;
  margin-top: 2px;
}

/* ── 13. Toast ─────────────────────────────────────── */
.toast {
  position: fixed; bottom: 28px; right: 28px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--red);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  font-size: 0.84rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px); opacity: 0;
  transition: transform var(--t-base), opacity var(--t-base);
  z-index: 999; pointer-events: none;
  max-width: 320px;
}

.toast.show {
  transform: translateY(0); opacity: 1;
}

/* ── 14. Responsive ────────────────────────────────── */
@media (max-width: 900px) {
  :root { --form-w: 100%; }

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

  .form-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 60vh;
  }

  .preview-panel {
    height: 80vw; min-height: 500px;
  }

  .invoice-preview {
    width: 100%; min-width: 320px;
    padding: 28px 24px;
    font-size: 11px;
  }

  .inv-main-title { font-size: 22px; }

  .items-col-header,
  .item-row {
    grid-template-columns: 1fr 75px 55px 80px 28px;
  }
}

@media (max-width: 600px) {
  .app-header { padding: 0 16px; }
  .brand-tagline { display: none; }
  .brand-name { font-size: 1rem; }
  .header-controls { gap: 6px; }
  .btn span { display: none; }
  .btn svg { display: block; }
}

/* ═══════════════════════════════════════════════════
   LANDING PAGE OVERLAY
   ═══════════════════════════════════════════════════ */

/* ── Landing Overlay Container ─────────────────────── */
.landing-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: var(--bg-base);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #333 var(--bg-base);
  animation: fadeIn 0.4s ease both;
}

.landing-overlay.hidden {
  animation: overlayExit 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  pointer-events: none;
}

@keyframes overlayExit {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0; transform: scale(1.02); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── Large button variant ──────────────────────────── */
.btn-lg {
  padding: 13px 26px;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  gap: 9px;
}

/* Disabled state for placeholder buttons */
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Landing Navbar ────────────────────────────────── */
.landing-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  animation: slideDown 0.5s var(--t-slow) both;
}

.landing-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.landing-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.landing-nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ── Hero Section ──────────────────────────────────── */
.landing-hero {
  position: relative;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 64px;
  padding: 80px 28px 80px;
  max-width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}

/* Dot-grid background */
.hero-bg-grid {
  position: absolute;
  inset: -80px;
  background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* Glow orbs */
.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.hero-glow-left {
  background: radial-gradient(circle, rgba(224, 49, 49, 0.14) 0%, transparent 70%);
  top: -100px;
  left: -150px;
}

.hero-glow-right {
  background: radial-gradient(circle, rgba(224, 49, 49, 0.08) 0%, transparent 70%);
  bottom: -100px;
  right: -150px;
}

/* Hero content (left side) */
.hero-content {
  position: relative;
  z-index: 1;
  flex: 1;
  max-width: 560px;
  animation: fadeUp 0.7s 0.1s both;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--red-glow-sm);
  border: 1px solid var(--red-border);
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 40px;
  margin-bottom: 28px;
  letter-spacing: 0.01em;
}

.hero-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
  animation: pulse-dot 2s ease-in-out infinite;
  flex-shrink: 0;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 22px;
}

.hero-title-accent {
  color: var(--red);
  position: relative;
  display: inline-block;
}

.hero-title-accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), transparent);
  border-radius: 2px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.hero-disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

/* ── Mock Preview Card ─────────────────────────────── */
.hero-preview-card {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 380px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(224,49,49,0.1),
    0 8px 40px rgba(0,0,0,0.6),
    0 0 80px rgba(224,49,49,0.05);
  animation: fadeUp 0.8s 0.25s both;
  transform-origin: center top;
}

.hero-preview-card::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 20px;
  right: 20px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(224,49,49,0.6), transparent);
}

.hero-preview-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

.hpb-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hpb-red    { background: #ff5f56; }
.hpb-yellow { background: #ffbd2e; }
.hpb-green  { background: #27c93f; }

.hpb-label {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hpb-pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
  animation: pulse-dot 2s ease-in-out infinite;
  margin-left: 6px;
}

.hero-preview-body {
  padding: 20px;
  background: #fff;
  color: #1a1a1a;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
}

.hpb-row { display: flex; align-items: flex-start; gap: 12px; }

.hpb-title-row {
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.hpb-logo-block {
  width: 56px;
  height: 26px;
  background: #f0f0f0;
  border-radius: 4px;
}

.hpb-invoice-label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: #1a1a1a;
}

.hpb-divider {
  height: 1.5px;
  background: #1a1a1a;
  margin-bottom: 10px;
}

.hpb-meta {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 10px;
}

.hpb-meta-line {
  display: flex;
  gap: 6px;
}

.hpb-key { font-weight: 700; color: #333; min-width: 60px; flex-shrink: 0; }
.hpb-val { color: #555; }

.hpb-parties {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 14px;
}

.hpb-party {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Skeleton bars for "name" areas */
.hpb-skel {
  display: inline-block;
  height: 9px;
  border-radius: 4px;
  background: #e8e8e8;
}

.hpb-skel-sm  { width: 70px; }
.hpb-skel-md  { width: 120px; }
.hpb-skel-lg  { width: 160px; }

.hpb-table {
  margin-bottom: 10px;
  border: 1px solid #e8e8e8;
  border-radius: 4px;
  overflow: hidden;
}

.hpb-thead, .hpb-trow {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 6px;
  padding: 6px 8px;
  font-size: 10px;
  align-items: center;
}

.hpb-thead {
  background: #1a1a1a;
  color: #fff;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hpb-trow { border-bottom: 1px solid #f0f0f0; color: #333; }
.hpb-trow:last-child { border-bottom: none; }
.hpb-trow-alt { background: #fafafa; }
.hpb-trow span:not(.hpb-skel) { text-align: right; }

.hpb-totals {
  border-top: 1.5px solid #1a1a1a;
  padding-top: 6px;
}

.hpb-total-row {
  display: flex;
  justify-content: space-between;
  padding: 3px 0;
  font-size: 10.5px;
  color: #555;
}

.hpb-grand {
  font-weight: 700;
  font-size: 12px;
  color: #1a1a1a;
  border-top: 1.5px solid #1a1a1a;
  padding-top: 5px;
  margin-top: 3px;
}

/* ── Shared Section Utilities ──────────────────────── */
.landing-section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

.landing-section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  background: var(--red-glow-sm);
  border: 1px solid var(--red-border);
  padding: 4px 12px;
  border-radius: 20px;
}

.landing-section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.2;
}

.landing-section-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 560px;
  margin-bottom: 52px;
}

/* ── Features Section ──────────────────────────────── */
.landing-features {
  padding: 100px 0;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(224,49,49,0.05) 0%, transparent 60%),
    var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(224,49,49,0.3), transparent);
  opacity: 0;
  transition: opacity var(--t-base);
}

.feature-card:hover {
  border-color: var(--red-border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(224,49,49,0.1);
}

.feature-card:hover::before { opacity: 1; }

.feature-icon-wrap {
  width: 46px;
  height: 46px;
  background: var(--red-glow-sm);
  border: 1px solid var(--red-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  transition: background var(--t-base);
}

.feature-card:hover .feature-icon-wrap {
  background: var(--red-glow);
}

.feature-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── How It Works Section ──────────────────────────── */
.landing-how {
  padding: 100px 0;
}

.steps-track {
  display: flex;
  gap: 0;
  position: relative;
  justify-content: center;
}

.step-connector {
  position: absolute;
  top: 60px;
  left: calc(50% - 33%);
  width: 66%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--red-border), var(--red-border), transparent);
  z-index: 0;
}

.step-card {
  position: relative;
  z-index: 1;
  flex: 1;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 24px;
  animation: fadeUp 0.6s ease both;
}

.step-card:nth-child(2) { animation-delay: 0.1s; }
.step-card:nth-child(3) { animation-delay: 0.2s; }
.step-card:nth-child(4) { animation-delay: 0.3s; }

.step-num {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--red);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  background: var(--red-glow-sm);
  border: 1px solid var(--red-border);
  padding: 3px 10px;
  border-radius: 20px;
}

.step-icon-wrap {
  width: 72px;
  height: 72px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: border-color var(--t-base), box-shadow var(--t-base);
}

.step-card:hover .step-icon-wrap {
  border-color: var(--red-border);
  box-shadow: 0 0 0 6px var(--red-glow-sm);
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── CTA Banner ────────────────────────────────────── */
.landing-cta-banner {
  position: relative;
  padding: 90px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  text-align: center;
}

.cta-banner-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(224,49,49,0.12) 0%, transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.cta-banner-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.cta-banner-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.cta-banner-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 440px;
  line-height: 1.6;
  margin-bottom: 10px;
}

/* ── Landing Footer ────────────────────────────────── */
.landing-footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  background: var(--bg-base);
}

.landing-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.landing-footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ── Landing Responsive ────────────────────────────── */
@media (max-width: 1024px) {
  .landing-hero {
    flex-direction: column;
    gap: 48px;
    min-height: auto;
    padding: 64px 24px 80px;
    text-align: center;
  }

  .hero-content { max-width: 640px; }
  .hero-actions { justify-content: center; }
  .hero-subtitle { margin: 0 auto 36px; }

  .hero-preview-card { width: 100%; max-width: 440px; }

  .features-grid { grid-template-columns: repeat(2, 1fr); }

  .steps-track { flex-direction: column; align-items: center; gap: 36px; }
  .step-connector { display: none; }
  .step-card { max-width: 420px; }
}

@media (max-width: 640px) {
  .landing-nav-inner { padding: 0 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .landing-section-inner { padding: 0 16px; }
  .landing-section-sub { margin-bottom: 36px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn-lg { width: 100%; justify-content: center; }
  .landing-footer-inner { flex-direction: column; align-items: flex-start; }
}

/* ── 15. Auth Modal ───────────────────────────────── */
.auth-modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-base), visibility var(--t-base);
}

.auth-modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.auth-modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 420px;
  padding: 40px;
  position: relative;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.03) inset;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-modal-overlay.show .auth-modal-content {
  transform: translateY(0) scale(1);
}

.auth-modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color var(--t-fast);
}

.auth-modal-close:hover {
  color: var(--text-primary);
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

#auth-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

#auth-subtitle {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.btn-full {
  width: 100%;
  justify-content: center;
  padding: 10px 16px;
}

.auth-google-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 24px;
}

.auth-google-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin-bottom: 24px;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-light);
}

.auth-divider span {
  padding: 0 12px;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.btn-link {
  background: none;
  border: none;
  color: var(--red);
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  padding: 0 4px;
  transition: color var(--t-fast);
}

.btn-link:hover {
  color: var(--red-dim);
  text-decoration: underline;
}

/* Fix z-index of main app header to sit behind modal */
.app-header {
  z-index: 10;
}

/* ═══════════════════════════════════════════════════
   DASHBOARD STYLES
   ═══════════════════════════════════════════════════ */
.dashboard-main {
  padding: 40px;
  max-width: 1200px;
  margin: calc(var(--header-h) + 20px) auto 0;
  width: 100%;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.dashboard-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.dashboard-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--red-border);
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
}

.dashboard-table-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: auto;
}

.dashboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.dashboard-table th {
  text-align: left;
  padding: 16px 24px;
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}

.dashboard-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  vertical-align: middle;
}

.dashboard-table tr:last-child td {
  border-bottom: none;
}

.dashboard-table tr:hover {
  background: var(--bg-elevated);
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge.paid { background: rgba(52, 168, 83, 0.1); color: #34A853; border: 1px solid rgba(52, 168, 83, 0.2); }
.badge.draft { background: rgba(251, 188, 5, 0.1); color: #FBBC05; border: 1px solid rgba(251, 188, 5, 0.2); }
.badge.sent { background: rgba(66, 133, 244, 0.1); color: #4285F4; border: 1px solid rgba(66, 133, 244, 0.2); }

.action-btns {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}