/* ================================================
   GST Invoice Generator — style.css
   ================================================ */

/* ---- VARIABLES ---- */
:root {
  --ink: #1a1a2e;
  --ink2: #2d2d4e;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f9f8f6;
  --card: #ffffff;
  --accent: #0f4c81;
  --accent2: #1a73e8;
  --success: #16a34a;
  --error: #dc2626;
  --warn: #d97706;
  --preview-bg: #f0ede8;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --radius: 10px;
}

/* ---- RESET ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Mulish', sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.6;
}

/* ---- HEADER ---- */
.site-header {
  background: var(--ink);
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,.2);
}
.site-header .logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.3rem;
  letter-spacing: -.5px;
}
.site-header .logo span { color: #60a5fa; }
.header-actions { display: flex; gap: 10px; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 7px;
  font-family: 'Mulish', sans-serif;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all .18s ease;
  text-decoration: none;
}
.btn-ghost {
  background: rgba(255,255,255,.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,.2);
}
.btn-ghost:hover { background: rgba(255,255,255,.2); }
.btn-primary { background: var(--accent2); color: #fff; }
.btn-primary:hover { background: #1557b0; transform: translateY(-1px); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; transform: translateY(-1px); }
.btn-danger {
  background: transparent;
  color: var(--error);
  border: 1px solid var(--error);
  padding: 5px 8px;
  font-size: 12px;
}
.btn-danger:hover { background: var(--error); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ---- TABS ---- */
.tabs-bar {
  background: #fff;
  border-bottom: 2px solid var(--border);
  display: flex;
  padding: 0 24px;
}
.tab {
  padding: 12px 20px;
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2.5px solid transparent;
  margin-bottom: -2px;
  transition: all .15s;
}
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- LAYOUT ---- */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  height: calc(100vh - 106px);
}
.form-col {
  overflow-y: auto;
  padding: 24px;
  background: var(--bg);
}
.preview-col {
  overflow-y: auto;
  background: var(--preview-bg);
  padding: 24px;
  border-left: 1px solid var(--border);
}

/* ---- CARDS ---- */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  animation: fadeIn .3s ease both;
}
.card-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1rem;
  color: var(--ink2);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title .icon {
  width: 26px;
  height: 26px;
  background: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
}

/* ---- FORM ELEMENTS ---- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.form-full { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 4px; }
label {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
}
input, select, textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 7px;
  font-family: 'Mulish', sans-serif;
  font-size: 13px;
  color: var(--ink);
  background: #fff;
  transition: border-color .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(26,115,232,.1);
}
input.valid { border-color: var(--success); }
input.invalid { border-color: var(--error); }

.field-hint { font-size: 11px; margin-top: 2px; }
.field-hint.success { color: var(--success); }
.field-hint.error { color: var(--error); }
.field-hint.warn { color: var(--warn); }

.gstin-row { display: flex; gap: 8px; align-items: flex-start; }
.gstin-row > div { flex: 1; }

/* ---- TOGGLE ---- */
.toggle-group {
  display: flex;
  background: var(--bg);
  border-radius: 8px;
  padding: 3px;
  border: 1px solid var(--border);
  width: fit-content;
}
.toggle-option {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all .15s;
  color: var(--muted);
}
.toggle-option.active { background: var(--accent); color: #fff; }

/* ---- ITEMS TABLE ---- */
.items-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.items-table th {
  background: var(--ink);
  color: #fff;
  padding: 8px 6px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .4px;
}
.items-table td {
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.items-table input,
.items-table select {
  padding: 6px 8px;
  font-size: 12px;
  border-radius: 5px;
}
.amount-cell {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink2);
  text-align: right;
  padding-right: 8px !important;
  white-space: nowrap;
}

/* ---- LOGO UPLOAD ---- */
.logo-upload-area {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all .15s;
}
.logo-upload-area:hover {
  border-color: var(--accent2);
  background: rgba(26,115,232,.03);
}
.logo-preview { max-height: 60px; max-width: 160px; object-fit: contain; }
.logo-upload-text { color: var(--muted); font-size: 12px; }

/* ---- SUMMARY BOX ---- */
.summary-box {
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  padding: 16px 20px;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 13px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.summary-row:last-child {
  border-bottom: none;
  font-size: 16px;
  font-weight: 700;
  padding-top: 10px;
  margin-top: 4px;
}
.summary-row .slabel { color: rgba(255,255,255,.7); }
.summary-row .svalue { font-family: 'DM Mono', monospace; }
.tax-type-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(96,165,250,.2);
  color: #60a5fa;
  margin-left: 8px;
}

/* ---- ACTION BAR ---- */
.action-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

/* ---- INVOICE PREVIEW ---- */
.invoice-preview {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(0,0,0,.12);
  overflow: hidden;
  max-width: 680px;
  margin: 0 auto;
  font-size: 12px;
}
.inv-header {
  background: var(--accent);
  color: #fff;
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.inv-logo-img {
  max-height: 55px;
  max-width: 140px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}
.inv-logo-placeholder {
  font-family: 'DM Serif Display', serif;
  font-size: 1.1rem;
  color: #fff;
  max-width: 150px;
  line-height: 1.3;
}
.inv-title-area { text-align: right; }
.inv-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.6rem;
  letter-spacing: 1px;
  color: #fff;
}
.inv-subtitle {
  font-size: 11px;
  color: rgba(255,255,255,.7);
  margin-top: 2px;
}
.inv-meta {
  background: #f0f4ff;
  padding: 14px 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
.inv-meta-item .mlabel {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--muted);
  font-weight: 700;
}
.inv-meta-item .mvalue {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  font-family: 'DM Mono', monospace;
}
.inv-parties {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--border);
}
.inv-party { padding: 16px 28px; }
.inv-party:first-child { border-right: 1px solid var(--border); }
.party-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 6px;
}
.party-name { font-weight: 700; font-size: 13px; color: var(--ink); margin-bottom: 3px; }
.party-gstin {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 4px;
}
.party-addr { font-size: 11px; color: var(--muted); line-height: 1.5; }

.inv-items-wrap { padding: 0 28px 20px; overflow-x: auto; }
.inv-items-wrap table { width: 100%; border-collapse: collapse; margin-top: 16px; table-layout: fixed; }
.inv-items-wrap th {
  background: #1a1a2e;
  color: #fff;
  padding: 8px 6px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .5px;
  font-weight: 700;
  word-break: break-word;
}
.inv-items-wrap td {
  padding: 6px 6px;
  border-bottom: 1px solid #f3f4f6;
  font-size: 10px;
  color: var(--ink2);
  word-break: break-all;
}
.num { text-align: right; font-family: 'DM Mono', monospace; }

.inv-tax-summary {
  margin: 0 28px 20px;
  background: #f8f9ff;
  border-radius: 8px;
  overflow: hidden;
}
.inv-tax-row {
  display: flex;
  justify-content: space-between;
  padding: 7px 14px;
  border-bottom: 1px solid #eef0f8;
  font-size: 11px;
}
.inv-tax-row:last-child { border-bottom: none; }
.inv-tax-row.total-row {
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  padding: 10px 14px;
}
.tval { font-family: 'DM Mono', monospace; }

.inv-words {
  margin: 0 28px 20px;
  padding: 10px 14px;
  background: #fffbeb;
  border-left: 3px solid var(--warn);
  border-radius: 4px;
  font-size: 11px;
  color: var(--ink2);
  font-style: italic;
}
.inv-footer {
  background: #f8f9ff;
  border-top: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}
.sig-block { text-align: right; }
.sig-line { border-top: 1px solid var(--ink); width: 140px; margin-bottom: 4px; }
.sig-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.disclaimer { font-size: 10px; color: var(--muted); max-width: 240px; line-height: 1.4; }
.inv-rc-badge {
  background: #fee2e2;
  color: #dc2626;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  margin-left: 8px;
}

/* ---- HISTORY ---- */
.history-item {
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.inv-no { font-family: 'DM Mono', monospace; font-weight: 600; font-size: 13px; color: var(--accent); }
.hi-meta { font-size: 11px; color: var(--muted); margin-top: 2px; }
.hi-right { display: flex; align-items: center; gap: 10px; }
.hi-amount { font-family: 'DM Mono', monospace; font-size: 14px; font-weight: 700; color: var(--ink); }
.history-actions { display: flex; gap: 6px; }
.history-empty { text-align: center; padding: 40px; color: var(--muted); }

/* ---- HSN AUTOCOMPLETE ---- */
.hsn-wrapper { position: relative; }
.hsn-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 1.5px solid var(--accent2);
  border-top: none;
  border-radius: 0 0 7px 7px;
  max-height: 160px;
  overflow-y: auto;
  z-index: 50;
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}
.hsn-option {
  padding: 7px 10px;
  cursor: pointer;
  font-size: 11px;
  border-bottom: 1px solid var(--border);
}
.hsn-option:hover { background: var(--bg); }
.hsn-code { font-family: 'DM Mono', monospace; font-weight: 600; color: var(--accent); margin-right: 6px; }

/* ---- UTILITIES ---- */
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.note {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 11px;
  color: #92400e;
  margin-top: 8px;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .main-layout { grid-template-columns: 1fr; height: auto; }
  .preview-col { display: none; }
  .form-grid { grid-template-columns: 1fr; }
}

/* ---- PRINT ---- */
@media print {
  .site-header, .tabs-bar, .form-col, .action-bar { display: none !important; }
  .preview-col { border: none; padding: 0; background: #fff; }
  .invoice-preview { box-shadow: none; }
}

/* ---- ANIMATION ---- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}