/* 
  Vector Generator Stylesheet
  Theme: Sleek Futuristic Dark with Glassmorphism & Neon Accents
*/

/* Google Fonts - Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-color: #0f111a;
  --bg-gradient: radial-gradient(circle at 50% 50%, #1e2235 0%, #0f111a 100%);
  --panel-bg: rgba(25, 28, 41, 0.65);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-hover-border: rgba(255, 255, 255, 0.15);
  
  --primary-color: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --secondary-color: #a855f7;
  --secondary-glow: rgba(168, 85, 247, 0.4);
  --success-color: #10b981;
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  --border-radius-lg: 16px;
  --border-radius-md: 10px;
  --border-radius-sm: 6px;
  
  --grid-line-color: #ff3b30;
  --grid-handle-color: #ff453a;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* アプリヘッダー */
header {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 2rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--border-radius-md);
  box-shadow: 0 0 15px var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(to right, #ffffff, #d1d5db);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* メインレイアウト */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem 4rem;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 2rem;
}

@media (max-width: 1024px) {
  main {
    grid-template-columns: 1fr;
  }
}

/* ガラスパネル共通 */
.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
  transition: border-color var(--transition-normal);
}

.glass-panel:hover {
  border-color: var(--panel-hover-border);
}

/* ワークスペース (プレビュー & 調整) */
.workspace-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.canvas-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  background-color: rgba(0, 0, 0, 0.4);
  border-radius: var(--border-radius-lg);
  border: 2px dashed rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.canvas-container.dragover {
  border-color: var(--primary-color);
  background-color: rgba(99, 102, 241, 0.05);
  box-shadow: 0 0 20px var(--primary-glow);
}

.canvas-container.has-image {
  border-style: solid;
  border-color: var(--panel-border);
}

/* アップロード前表示 */
.upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 3rem;
  text-align: center;
  width: 100%;
  height: 100%;
  justify-content: center;
  transition: color var(--transition-fast);
}

.upload-placeholder:hover {
  color: var(--text-primary);
}

.upload-placeholder svg {
  width: 48px;
  height: 48px;
  stroke: currentColor;
  stroke-width: 1.5;
  transition: transform var(--transition-normal);
}

.upload-placeholder:hover svg {
  transform: translateY(-5px);
  color: var(--primary-color);
}

.hidden-file-input {
  display: none;
}

/* 画像表示 & グリッド操作エリア */
.image-editor-wrapper {
  position: relative;
  display: none; /* JSで表示切り替え */
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  align-items: center;
  justify-content: center;
}

.image-editor-wrapper img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

/* グリッドガイドオーバーレイ */
.grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* 線以外を透過して下の画像を触らせる、または境界線自体でポインタをつかむ */
}

/* インタラクティブな分割線 */
.grid-line {
  position: absolute;
  background-color: var(--grid-line-color);
  opacity: 0.6;
  pointer-events: auto; /* 線はドラッグ可能にする */
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

.grid-line:hover,
.grid-line.active {
  opacity: 1;
  background-color: #ff453a;
  box-shadow: 0 0 8px rgba(255, 69, 58, 0.8);
}

.grid-line.vertical {
  width: 6px;
  margin-left: -3px; /* 中心の当たり判定 */
  cursor: ew-resize;
  top: 0;
  bottom: 0;
}

.grid-line.horizontal {
  height: 6px;
  margin-top: -3px; /* 中心の当たり判定 */
  cursor: ns-resize;
  left: 0;
  right: 0;
}

/* ドラッグハンドルノブ */
.grid-handle {
  position: absolute;
  background-color: #fff;
  border: 2px solid var(--grid-line-color);
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(0,0,0,0.4);
  pointer-events: none; /* 当たり判定は親の線に任せる */
  transition: transform var(--transition-fast);
}

.grid-line.vertical .grid-handle {
  width: 12px;
  height: 12px;
  left: -3px;
  top: 50%;
  transform: translateY(-50%) scale(1);
}

.grid-line.horizontal .grid-handle {
  width: 12px;
  height: 12px;
  top: -3px;
  left: 50%;
  transform: translateX(-50%) scale(1);
}

.grid-line:hover .grid-handle,
.grid-line.active .grid-handle {
  transform: translateY(-50%) scale(1.3) !important;
  border-color: #fff;
  background-color: var(--grid-handle-color);
}
.grid-line.horizontal:hover .grid-handle,
.grid-line.horizontal.active .grid-handle {
  transform: translateX(-50%) scale(1.3) !important;
  border-color: #fff;
  background-color: var(--grid-handle-color);
}

/* コントロールサイドバー */
.control-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.control-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-group label span.value {
  color: var(--primary-color);
  font-family: monospace;
  font-size: 1rem;
}

/* 数値入力スライダー */
.slider-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255,255,255,0.08);
  height: 6px;
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  cursor: pointer;
  box-shadow: 0 0 10px var(--primary-glow);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* セレクトボックス / ラジオボタン */
.select-wrapper {
  position: relative;
}

select {
  width: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  appearance: none;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

select:focus {
  border-color: var(--primary-color);
}

.select-wrapper::after {
  content: '▼';
  font-size: 0.8rem;
  color: var(--text-secondary);
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

/* ベクターモード切り替えカード */
.mode-selector {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.mode-option {
  position: relative;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  padding: 0.875rem 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.mode-option:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.02);
}

.mode-option.active {
  border-color: var(--primary-color);
  background: rgba(99, 102, 241, 0.08);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.15);
}

.mode-option input[type="radio"] {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--text-muted);
  border-radius: 50%;
  outline: none;
  margin-top: 3px;
  position: relative;
  transition: border-color var(--transition-fast);
}

.mode-option.active input[type="radio"] {
  border-color: var(--primary-color);
}

.mode-option.active input[type="radio"]::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--primary-color);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.mode-info {
  display: flex;
  flex-direction: column;
}

.mode-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.mode-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border-radius: var(--border-radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow), 0 0 10px var(--secondary-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* グリッド分割結果 (プレビューセクション) */
.results-section {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 1rem;
}

.results-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

/* プレビューグリッド */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}

/* プレビューカード */
.preview-card {
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.preview-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* チェッカーボード背景 */
.checkerboard-bg {
  aspect-ratio: 1;
  width: 100%;
  background-color: #1a1c23;
  background-image: 
    linear-gradient(45deg, #13141a 25%, transparent 25%), 
    linear-gradient(-45deg, #13141a 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #13141a 75%), 
    linear-gradient(-45deg, transparent 75%, #13141a 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  position: relative;
}

.checkerboard-bg svg,
.checkerboard-bg img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.5));
}

.card-info {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: rgba(15, 17, 26, 0.4);
}

.card-title {
  font-size: 0.8rem;
  font-family: monospace;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-btn {
  padding: 0.5rem;
  font-size: 0.8rem;
  border-radius: var(--border-radius-sm);
}

/* トースト通知 */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: rgba(25, 28, 41, 0.9);
  border: 1px solid var(--primary-color);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 15px var(--primary-glow);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

/* ローディング表示 overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 17, 26, 0.8);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.loading-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

/* フッター */
footer {
  text-align: center;
  padding: 3rem 1rem 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--panel-border);
  max-width: 1400px;
  margin: 4rem auto 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* 利用規約ページ（terms.html）用スタイル */
.terms-layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}

.nav-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--panel-border);
  transition: all var(--transition-fast);
  margin-bottom: 2rem;
}

.nav-back-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateX(-3px);
}

.nav-back-link svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

.terms-header-box {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 1.5rem;
}

.terms-header-box h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(to right, #ffffff, #d1d5db);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.terms-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.terms-badge {
  display: inline-block;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

/* 目次 (Table of Contents) */
.terms-toc {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.terms-toc-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.terms-toc ol {
  padding-left: 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.5rem 1.5rem;
}

.terms-toc li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.terms-toc li a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* 各条文スタイル */
.terms-section {
  margin-bottom: 2.5rem;
  scroll-margin-top: 2rem;
}

.terms-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.terms-section h2 .sec-num {
  color: var(--primary-color);
}

.terms-section p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: #d1d5db;
  margin-bottom: 0.75rem;
}

.terms-section ol,
.terms-section ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  color: #d1d5db;
  font-size: 0.95rem;
  line-height: 1.8;
}

.terms-section li {
  margin-bottom: 0.5rem;
}

.terms-section li strong {
  color: var(--text-primary);
}

/* ハイライト情報ボックス */
.info-box {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  display: flex;
  gap: 0.75rem;
}

.info-box svg {
  width: 20px;
  height: 20px;
  stroke: var(--primary-color);
  flex-shrink: 0;
  margin-top: 2px;
}

.info-box-content {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #e0e7ff;
}

/* 付則 */
.terms-appendix {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--panel-border);
  font-size: 0.875rem;
  color: var(--text-secondary);
}