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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 15px;
  color: #333;
  background: #f0f2f5;
}

/* ===== HEADER ===== */
header {
  background: #1b5e20;
  color: white;
  padding: 1.2rem 1rem;
  text-align: center;
}
header h1 { font-size: 1.25rem; font-weight: 700; }
.subtitle { font-size: 0.8rem; opacity: 0.85; margin-top: 0.25rem; }

/* ===== LAYOUT ===== */
.app-layout {
  display: flex;
  gap: 0;
  min-height: calc(100vh - 120px);
}

/* ===== FORM PANEL ===== */
.form-panel {
  width: 300px;
  min-width: 300px;
  background: white;
  border-right: 1px solid #ddd;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  max-height: calc(100vh - 64px);
  position: sticky;
  top: 0;
}

.tab-bar {
  display: flex;
  border-bottom: 2px solid #e0e0e0;
}

.tab-btn {
  flex: 1;
  padding: 0.6rem 0.2rem;
  font-size: 0.78rem;
  font-weight: 600;
  border: none;
  background: white;
  color: #666;
  cursor: pointer;
  transition: all 0.15s;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.tab-btn.active {
  color: #1b5e20;
  border-bottom-color: #1b5e20;
}

.tab-content {
  display: none;
  padding: 1rem;
  flex: 1;
  overflow-y: auto;
}

.tab-content.active { display: block; }

.tab-content h2 {
  font-size: 0.9rem;
  color: #1b5e20;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.save-note {
  font-size: 0.72rem;
  color: #888;
  margin-bottom: 0.75rem;
}

label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: #555;
  margin: 0.7rem 0 0.25rem;
}

input[type="text"],
input[type="date"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.5rem 0.6rem;
  font-size: 1rem;
  border: 1.5px solid #ddd;
  border-radius: 6px;
  background: white;
  font-family: inherit;
  -webkit-text-size-adjust: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: #1b5e20;
}

textarea { resize: vertical; }

/* ===== LINE ITEMS ===== */
.item-row {
  background: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 6px;
  padding: 0.6rem;
  margin-bottom: 0.5rem;
}

.item-row label { margin-top: 0.4rem; }
.item-row label:first-child { margin-top: 0; }

.item-row-nums {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.4rem;
}

.item-row-nums label { font-size: 0.72rem; }

.item-amount-display {
  text-align: right;
  font-size: 0.82rem;
  font-weight: 700;
  color: #1b5e20;
  margin-top: 0.3rem;
}

.remove-row-btn {
  display: block;
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.3rem;
  font-size: 0.75rem;
  color: #c62828;
  background: white;
  border: 1px solid #ffcdd2;
  border-radius: 4px;
  cursor: pointer;
}

.add-row-btn {
  display: block;
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #1b5e20;
  background: #f1f8e9;
  border: 1.5px dashed #81c784;
  border-radius: 6px;
  cursor: pointer;
  min-height: 44px;
  touch-action: manipulation;
}

/* ===== PREVIEW PANEL ===== */
.preview-panel {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview-toolbar {
  width: 100%;
  max-width: 760px;
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}

.print-btn {
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  background: #1b5e20;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.print-btn:hover { background: #2e7d32; }

/* ===== INVOICE ===== */
.invoice {
  width: 100%;
  max-width: 760px;
  background: white;
  padding: 2.5rem 3rem;
  box-shadow: 0 2px 16px rgba(0,0,0,0.12);
  min-height: 297mm;
}

.inv-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.inv-title {
  font-size: 2rem;
  font-weight: 700;
  color: #1a237e;
  letter-spacing: 0.1em;
}

.inv-meta-box {
  font-size: 0.82rem;
  color: #444;
  text-align: right;
  line-height: 1.8;
}

.inv-label {
  color: #888;
  margin-right: 0.5rem;
}

/* 宛先・発行者 */
.inv-parties {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.inv-client { flex: 1; }
.client-company { font-size: 1.15rem; font-weight: 700; color: #111; }
.client-dept { font-size: 0.85rem; color: #555; margin-top: 0.15rem; }
.client-name { font-size: 0.95rem; color: #333; margin-top: 0.2rem; }

.inv-sender {
  font-size: 0.82rem;
  color: #555;
  text-align: right;
  line-height: 1.7;
  min-width: 200px;
}

.sender-name { font-size: 1rem; font-weight: 700; color: #222; }

/* 請求金額ボックス */
.inv-total-box {
  border: 2px solid #1a237e;
  border-radius: 6px;
  padding: 0.9rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.inv-total-label { font-size: 0.9rem; font-weight: 600; color: #333; }
.inv-total-amount { font-size: 1.6rem; font-weight: 700; color: #1a237e; }

/* 明細テーブル */
.inv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 0;
}

.inv-table th {
  background: #1a237e;
  color: white;
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-weight: 600;
}

.inv-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid #eee;
  vertical-align: middle;
}

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

.col-name  { width: 45%; }
.col-qty   { width: 10%; text-align: right; }
.col-unit  { width: 10%; text-align: center; }
.col-price { width: 17%; text-align: right; }
.col-amount{ width: 18%; text-align: right; font-weight: 600; }

/* 小計・合計 */
.inv-subtotals {
  border-top: 2px solid #1a237e;
  padding-top: 0.5rem;
  margin-bottom: 1.5rem;
}

.subtotal-row {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0.75rem;
  font-size: 0.88rem;
  color: #555;
}

.total-row {
  border-top: 1px solid #ccc;
  margin-top: 0.25rem;
  padding-top: 0.4rem;
  font-weight: 700;
  font-size: 1rem;
  color: #1a237e;
}

/* 振込先 */
.inv-bank {
  background: #f5f5f5;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.85rem;
}

.inv-bank-title {
  font-weight: 700;
  color: #333;
  margin-bottom: 0.3rem;
  font-size: 0.82rem;
}

/* 備考 */
.inv-note-section {
  border-top: 1px solid #e0e0e0;
  padding-top: 0.75rem;
  font-size: 0.85rem;
}

.inv-note-title {
  font-weight: 700;
  color: #555;
  margin-bottom: 0.3rem;
  font-size: 0.82rem;
}

.inv-note-body { color: #555; line-height: 1.6; white-space: pre-wrap; }

/* ===== HOWTO ===== */
.howto-section {
  max-width: 760px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

.howto-inner {
  background: white;
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.howto-inner h2 {
  font-size: 0.95rem;
  color: #1b5e20;
  margin: 1rem 0 0.5rem;
  font-weight: 700;
}

.howto-inner h2:first-child { margin-top: 0; }

.howto-inner ol, .howto-inner p {
  font-size: 0.85rem;
  color: #555;
  line-height: 1.7;
}

.howto-inner ol { padding-left: 1.4rem; }
.howto-inner li { margin-bottom: 0.3rem; }

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.82rem;
  color: #888;
}
footer a { color: #666; }

/* ===== アフィリエイト ===== */
.affiliate-block {
  margin: 1rem 0 1.5rem;
  padding: 1rem;
  background: #f9f9f9;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  text-align: center;
}
.affiliate-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  background: #999;
  padding: 1px 6px;
  border-radius: 3px;
  margin-bottom: 0.5rem;
}
.affiliate-desc {
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 0.75rem;
}

/* ===== PRINT ===== */
@media print {
  .no-print { display: none !important; }

  body { background: white; font-size: 11pt; }

  .app-layout {
    display: block;
  }

  .preview-panel {
    padding: 0;
    overflow: visible;
  }

  .invoice {
    max-width: 100%;
    box-shadow: none;
    padding: 0;
    min-height: unset;
  }

  .inv-title { font-size: 22pt; }
  .inv-total-amount { font-size: 16pt; }
}

/* ===== MOBILE ===== */
.mobile-view-bar {
  display: none;
}

.back-to-form-btn {
  display: none;
}

@media (max-width: 700px) {
  /* モバイルビュー切り替えバー */
  .mobile-view-bar {
    display: flex;
    background: #1b5e20;
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .mobile-view-btn {
    flex: 1;
    padding: 0.75rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    background: transparent;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    touch-action: manipulation;
    min-height: 48px;
    transition: all 0.15s;
  }

  .mobile-view-btn.active {
    color: white;
    border-bottom: 3px solid white;
  }

  .back-to-form-btn {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: #1b5e20;
    background: #f1f8e9;
    border: 1.5px solid #81c784;
    border-radius: 6px;
    cursor: pointer;
    touch-action: manipulation;
  }

  .app-layout {
    flex-direction: column;
  }

  /* デフォルト: フォームを表示、プレビューを非表示 */
  .form-panel {
    width: 100%;
    min-width: unset;
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: none;
  }

  .preview-panel {
    display: none;
    padding: 0.75rem 0.5rem;
  }

  /* プレビュー表示時 */
  .app-layout.show-preview .form-panel {
    display: none;
  }

  .app-layout.show-preview .preview-panel {
    display: flex;
  }

  .invoice {
    padding: 1.25rem 0.75rem;
    min-height: unset;
    box-shadow: 0 1px 6px rgba(0,0,0,0.1);
  }

  .inv-title { font-size: 1.3rem; }

  .inv-header {
    flex-direction: column;
    gap: 0.75rem;
  }

  .inv-meta-box { text-align: left; }

  .inv-parties { flex-direction: column; gap: 1rem; }
  .inv-sender { text-align: left; min-width: unset; }

  /* テーブルをスクロール可能に */
  .inv-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 0;
  }

  .inv-table { min-width: 480px; }

  .inv-total-amount { font-size: 1.3rem; }
}