:root {
  --bg: #0f1115;
  --panel: #151925;
  --text: #e8ecf1;
  --muted: #a8b3c2;
  --accent: #6fd3ff;
  --accent2: #a3ffa8;
  --danger: #ff7a7a;
  --line: #2a3144;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans JP", sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, #1a2030 0%, #0f1115 60%);
}

.app-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px; border-bottom: 1px solid var(--line);
  background: rgba(21,25,37,0.85); backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 5;
}

h1 { margin: 0; font-size: 20px; letter-spacing: .3px; }
.badge {
  font-size: 12px; margin-left: 8px; padding: 2px 6px;
  border-radius: 6px; background: var(--line); color: var(--muted);
}

.actions { display: flex; gap: 10px; align-items: center; }
button, .btn, .file-btn {
  background: #1d2333; color: var(--text); border: 1px solid var(--line);
  padding: 8px 12px; border-radius: 10px; cursor: pointer; text-decoration: none;
  font-size: 14px;
  font-family: inherit;
  font-weight: 400;
}
button:hover, .btn:hover, .file-btn:hover { border-color: var(--accent); }

/* 主要アクションボタン */
.primary-action-btn {
  background: linear-gradient(135deg, var(--accent) 0%, #4db8ff 100%);
  color: #0a0d11;
  border: 2px solid var(--accent);
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(111, 211, 255, 0.3);
  transition: all 0.3s ease;
}

.primary-action-btn:hover {
  background: linear-gradient(135deg, var(--accent2) 0%, #6fd3ff 100%);
  border-color: var(--accent2);
  box-shadow: 0 6px 20px rgba(111, 211, 255, 0.5);
  transform: translateY(-2px);
}

.primary-action-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(111, 211, 255, 0.4);
}

.file-btn { position: relative; overflow: hidden; display: inline-block; }
.file-btn input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}

.layout { display: grid; grid-template-columns: 340px 1fr; min-height: calc(100vh - 60px); }
.sidebar { border-right: 1px solid var(--line); background: linear-gradient(180deg, #121827, #10141f); }
.canvas-wrap { position: relative; }

/* グラフ凡例 */
.graph-legend {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(21, 25, 37, 0.95);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 100;
}

.legend-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text);
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(12, 15, 24, 0.6);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
}

.panel { padding: 16px; border-bottom: 1px solid var(--line); }
.panel h2 { margin: 0 0 12px; font-size: 16px; color: var(--accent); }

/* パネルヘッダー（h2とアクションボタンを横並び） */
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.panel-header h2 {
  margin: 0;
}

/* ノード編集パネル（インライン版） */
.node-edit-panel-inline {
  display: flex;
  gap: 6px;
}

/* アイコンボタン */
.icon-btn {
  background: rgba(111, 211, 255, 0.1);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s ease;
  line-height: 1;
}

.icon-btn:hover {
  background: rgba(111, 211, 255, 0.2);
  border-color: var(--accent2);
}

.icon-btn.danger {
  border-color: var(--danger);
}

.icon-btn.danger:hover {
  background: rgba(255, 122, 122, 0.15);
  border-color: var(--danger);
}
.field { display: grid; gap: 6px; margin-bottom: 12px; }
select, input[type=number] {
  background: #0f1422; color: var(--text); border: 1px solid var(--line); padding: 8px; border-radius: 8px;
}

/* プリセット読込ボタン */
.preset-load-btn {
  width: 100%;
  background: rgba(163, 255, 168, 0.1);
  border: 1px solid var(--accent2);
  color: var(--accent2);
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  transition: all 0.2s ease;
}

.preset-load-btn:hover {
  background: rgba(163, 255, 168, 0.2);
  border-color: var(--accent2);
  box-shadow: 0 0 8px rgba(163, 255, 168, 0.3);
}

.results { margin-top: 12px; }
.results h3 { margin: 6px 0; font-size: 14px; color: var(--muted); }

/* K最短経路リスト */
.paths-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 300px;
  overflow-y: auto;
}

.path-item {
  background: rgba(15, 20, 34, 0.6);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px 10px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  border-left-width: 4px;
}

/* 経路ランクに応じた左側カラーバー */
.path-item[data-rank="0"] {
  border-left-color: var(--accent2);
}

.path-item[data-rank="1"] {
  border-left-color: #ffd580;
}

.path-item[data-rank="2"] {
  border-left-color: var(--danger);
}

.path-item[data-rank="3"],
.path-item[data-rank="4"],
.path-item[data-rank="5"],
.path-item[data-rank="6"],
.path-item[data-rank="7"],
.path-item[data-rank="8"],
.path-item[data-rank="9"] {
  border-left-color: #c3a6ff;
}

.path-item:hover {
  border-color: var(--accent);
  background: rgba(15, 20, 34, 0.9);
  border-left-width: 4px;
}

.path-item.selected {
  border-color: var(--accent2);
  background: rgba(163, 255, 168, 0.08);
  box-shadow: 0 0 10px rgba(163, 255, 168, 0.2);
  border-left-width: 4px;
}

.path-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  gap: 8px;
}

.path-rank {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.path-cost {
  font-size: 12px;
  color: var(--muted);
  flex: 1;
}

.play-btn {
  background: rgba(111, 211, 255, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.play-btn:hover {
  background: rgba(111, 211, 255, 0.2);
  box-shadow: 0 0 8px rgba(111, 211, 255, 0.4);
}

.path-metrics {
  display: flex;
  gap: 16px;
  margin: 8px 0;
  padding: 6px 0;
  border-top: 1px solid rgba(42, 49, 68, 0.5);
  border-bottom: 1px solid rgba(42, 49, 68, 0.5);
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-label {
  font-size: 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-value {
  font-size: 13px;
  font-weight: 600;
}

.success-prob {
  color: var(--accent);
}

.risk-index {
  color: var(--danger);
}

.risk-index[data-risk^="0.0"],
.risk-index[data-risk^="0.1"] {
  color: var(--accent2);
}

.risk-index[data-risk^="0.2"],
.risk-index[data-risk^="0.3"] {
  color: #ffd580;
}

.path-route {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
  margin-top: 6px;
}

.no-path {
  color: var(--danger);
  font-size: 14px;
  text-align: center;
  padding: 20px;
}

/* 空状態 */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px 20px;
  text-align: center;
}

.empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-text {
  font-size: 14px;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.empty-hint {
  font-size: 12px;
  color: var(--muted);
  opacity: 0.7;
  line-height: 1.5;
  max-width: 250px;
}

/* 編集コントロール */
.edit-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.edit-btn {
  background: rgba(111, 211, 255, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: all 0.2s ease;
}

.edit-btn:hover {
  background: rgba(111, 211, 255, 0.2);
  border-color: var(--accent2);
}

.node-info { font-size: 13px; color: var(--muted); line-height: 1.6; }
.node-info .kv { display: grid; grid-template-columns: 90px 1fr; gap: 6px; }
.node-info .title { color: var(--text); font-weight: 600; }

.node-edit-panel {
  display: none;
  gap: 8px;
  margin-top: 10px;
}

.small-btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #1d2333;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s ease;
}

.small-btn:hover {
  border-color: var(--accent);
}

.small-btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}

.small-btn.danger:hover {
  background: rgba(255, 122, 122, 0.1);
}

.tips { margin: 8px 0 0 18px; padding: 0; }
.tips li { margin: 6px 0; color: var(--muted); }

/* ダイアログ */
.dialog {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(4px);
}

.dialog-content {
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 24px;
  min-width: 400px;
  max-width: 500px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

.dialog-content h3 {
  margin: 0 0 20px 0;
  color: var(--accent);
  font-size: 18px;
}

.form-field {
  margin-bottom: 16px;
}

.form-field label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.form-field input,
.form-field select {
  width: 100%;
  background: #0f1422;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 8px;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
}

.form-field input:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-field input[type="color"] {
  width: auto;
  height: 40px;
  padding: 2px;
  cursor: pointer;
}

.color-picker-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.color-reset-btn {
  padding: 8px 12px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #1d2333;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s ease;
}

.color-reset-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.field-hint {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 4px;
  font-style: italic;
}

.dialog-buttons {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.dialog-btn {
  flex: 1;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #1d2333;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s ease;
}

.dialog-btn:hover {
  border-color: var(--accent);
}

.dialog-btn.primary {
  background: var(--accent);
  color: #0f1115;
  border-color: var(--accent);
}

.dialog-btn.primary:hover {
  background: var(--accent2);
  border-color: var(--accent2);
}

svg { width: 100%; height: calc(100vh - 60px); background: transparent; }

.link {
  stroke: #6b7280; stroke-opacity: 0.6; stroke-width: 1.6;
  transition: all 0.3s ease;
}
.link.highlight {
  stroke: var(--accent2); stroke-width: 4px; stroke-opacity: 1;
  filter: drop-shadow(0 0 6px rgba(163,255,168,0.6));
}

/* アニメーション用のエッジスタイル */
.link.animate-edge {
  stroke: var(--accent);
  stroke-width: 4px;
  stroke-opacity: 1;
  filter: drop-shadow(0 0 8px rgba(111,211,255,0.8));
}

.link.animate-current-edge {
  stroke: var(--accent2);
  stroke-width: 5px;
  stroke-opacity: 1;
  filter: drop-shadow(0 0 12px rgba(163,255,168,1));
}

.link.animate-future-edge {
  stroke: #ffd580;
  stroke-width: 3px;
  stroke-opacity: 0.6;
  stroke-dasharray: 5, 5;
  animation: dash 1s linear infinite;
}

@keyframes dash {
  to {
    stroke-dashoffset: -10;
  }
}

.node circle {
  stroke: #0c0f18; stroke-width: 2px; cursor: grab;
  transition: all 0.3s ease;
}
.node circle:active { cursor: grabbing; }

/* ノードハイライト */
.node.node-highlight circle {
  stroke: var(--accent2);
  stroke-width: 3px;
  filter: drop-shadow(0 0 4px rgba(163,255,168,0.6));
}

/* アニメーション用のノードスタイル */
.node.animate-node circle {
  stroke: var(--accent);
  stroke-width: 3px;
  filter: drop-shadow(0 0 8px rgba(111,211,255,0.8));
}

.node.animate-current circle {
  stroke: var(--accent2);
  stroke-width: 5px;
  animation: node-pulse 0.8s ease-in-out;
  filter: drop-shadow(0 0 16px rgba(163,255,168,1));
}

.node.animate-future circle {
  stroke: #ffd580;
  stroke-width: 2.5px;
  opacity: 0.7;
  filter: drop-shadow(0 0 4px rgba(255, 213, 128, 0.5));
}

/* 経路外のノード・エッジを暗くする */
.node.animate-dim {
  opacity: 0.2;
}

.link.animate-dim {
  opacity: 0.15;
}

.node text {
  fill: var(--text); font-size: 11px; pointer-events: none; user-select: none;
  paint-order: stroke; stroke: rgba(15,17,21,0.8); stroke-width: 3px;
}

footer .footer {
  text-align: center; padding: 12px; border-top: 1px solid var(--line);
  background: rgba(21,25,37,0.65);
  color: var(--muted);
}

footer .footer a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

footer .footer a:hover {
  color: var(--accent2);
  text-decoration: underline;
}

footer .footer a:visited {
  color: #9db8ff;
}

/* ノード情報ポップアップ */
.node-popup {
  position: absolute;
  background: rgba(21, 25, 37, 0.98);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 10px 14px;
  pointer-events: none;
  z-index: 1000;
  min-width: 180px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6), 0 0 20px rgba(111, 211, 255, 0.2);
  backdrop-filter: blur(8px);
}

.popup-header {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

.popup-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  margin: 4px 0;
  color: var(--text);
}

.popup-label {
  color: var(--muted);
  font-weight: 500;
}

/* アニメーション定義 */
@keyframes node-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.8;
  }
}

/* 経路強調の点滅 */
@keyframes pulse {
  0% { stroke-opacity: 1; }
  50% { stroke-opacity: 0.35; }
  100% { stroke-opacity: 1; }
}
.link.pulse { animation: pulse 1.4s ease-in-out infinite; }

/* 通知ダイアログ */
.notification {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 3000;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.notification.hiding {
  animation: slideOut 0.3s ease-in forwards;
}

.notification-content {
  background: rgba(21, 25, 37, 0.98);
  border: 2px solid var(--accent2);
  border-radius: 12px;
  padding: 16px 20px;
  min-width: 320px;
  max-width: 400px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6), 0 0 20px rgba(163, 255, 168, 0.3);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.notification-icon {
  font-size: 28px;
  color: var(--accent2);
  background: rgba(163, 255, 168, 0.15);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.notification-message {
  flex: 1;
  padding-top: 4px;
}

.notification-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent2);
  margin-bottom: 6px;
}

.notification-detail {
  font-size: 13px;
  color: var(--text);
  line-height: 1.5;
}

.notification-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.notification-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}