:root {
  --bg: #0b0c10;
  --panel: #121318;
  --text: #e7e9ee;
  --muted: #a9afbb;
  --accent: #6ea8fe;
  --ok: #35c759;
  --warn: #ff9f0a;
  --bad: #ff453a;
  --card: #171923;
  --border: #26293a;
}

[data-theme="light"] {
  --bg: #f8f9fa;
  --panel: #ffffff;
  --text: #1a1d29;
  --muted: #6c757d;
  --accent: #0d6efd;
  --ok: #198754;
  --warn: #fd7e14;
  --bad: #dc3545;
  --card: #f1f3f4;
  --border: #dee2e6;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; padding: 0;
  background: radial-gradient(1200px 600px at 10% -10%, #1a1d2a, #0b0c10);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
}

[data-theme="light"] {
  background: radial-gradient(1200px 600px at 10% -10%, #e9ecef, #f8f9fa) !important;
  color: #1a1d29 !important;
}

[data-theme="light"] body {
  background: radial-gradient(1200px 600px at 10% -10%, #e9ecef, #f8f9fa) !important;
  color: #1a1d29 !important;
}

[data-theme="light"] html {
  background: #f8f9fa !important;
}

[data-theme="light"] * {
  color: inherit;
}

[data-theme="light"] .site-header h1 {
  color: #1a1d29 !important;
}

[data-theme="light"] .subtitle {
  color: #6c757d !important;
}

/* Light mode specific overrides */
[data-theme="light"] #pad {
  background: linear-gradient(145deg, #ffffff, #f8f9fa) !important;
}

[data-theme="light"] #radarChart {
  background: radial-gradient(circle, #f8f9fa, #e9ecef) !important;
}

[data-theme="light"] #heat {
  background: #f1f3f4 !important;
}

[data-theme="light"] .mini-pad {
  background: #f8f9fa !important;
  border-color: #dee2e6;
}

[data-theme="light"] .footer {
  background: #f1f3f4;
}

[data-theme="light"] .panel {
  background: #ffffff !important;
  color: #1a1d29 !important;
  border-color: #dee2e6 !important;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

[data-theme="light"] .assurance {
  background: #e8f5e8 !important;
  border-color: #c3e6c3 !important;
  color: #2d5a2d !important;
}

[data-theme="light"] .notice {
  background: #fff3cd !important;
  border-color: #ffeaa7 !important;
  color: #856404 !important;
}

[data-theme="light"] .card,
[data-theme="light"] .score-meter,
[data-theme="light"] .attack {
  background: #f1f3f4 !important;
  color: #1a1d29 !important;
  border-color: #dee2e6 !important;
}

/* Light mode button and form elements */
[data-theme="light"] .btn {
  background: #e9ecef;
  color: #495057;
  border-color: #ced4da;
}

[data-theme="light"] .btn:hover {
  background: #dee2e6;
  color: #212529;
}

[data-theme="light"] .btn-secondary {
  background: #f8f9fa;
  color: #6c757d;
  border-color: #dee2e6;
}

[data-theme="light"] .score-bar {
  background: linear-gradient(90deg, #e9ecef, #f1f3f4);
  border-color: #ced4da;
}

[data-theme="light"] select,
[data-theme="light"] input[type="text"],
[data-theme="light"] input[type="range"] {
  background: #ffffff;
  color: #495057;
  border-color: #ced4da;
}

/* Light mode learning content */
[data-theme="light"] .learning-accordion {
  background: #ffffff !important;
  border-color: #dee2e6 !important;
}

[data-theme="light"] .learning-content li {
  background: #ffffff !important;
  border-color: #e9ecef !important;
  color: #1a1d29 !important;
}

[data-theme="light"] .learning-content ul ul li {
  background: #f8f9fa !important;
  border-color: #dee2e6 !important;
  color: #1a1d29 !important;
}

[data-theme="light"] .learning-summary {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef) !important;
  color: #495057 !important;
}

[data-theme="light"] .learning-summary:hover {
  background: linear-gradient(135deg, #e9ecef, #dee2e6) !important;
}

[data-theme="light"] .learning-content {
  color: #1a1d29 !important;
}

/* Light mode saved items */
[data-theme="light"] .saved-item {
  background: #ffffff;
  border-color: #e9ecef;
}

/* Light mode tab buttons */
[data-theme="light"] .tab-btn {
  background: #f8f9fa;
  color: #495057;
  border-color: #dee2e6;
}

[data-theme="light"] .tab-btn:hover {
  background: #e9ecef;
  color: #212529;
}

[data-theme="light"] .tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Light mode example items */
[data-theme="light"] .example-item {
  background: #ffffff;
  border-color: #e9ecef;
}

/* Light mode theme toggle */
[data-theme="light"] .theme-toggle {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

[data-theme="light"] .pattern-sequence {
  background: #f1f3f4 !important;
  border-color: #dee2e6 !important;
  color: #6c757d !important;
}

.site-header { padding: 28px 24px 8px; text-align: center; }
.site-header h1 { margin: 0 0 6px; font-size: 28px; letter-spacing: .2px; }
.subtitle { margin: 0; color: var(--muted); }

.notice {
  margin: 10px auto 0; padding: 10px 12px;
  max-width: 1200px;
  background: #1f2231; border: 1px solid var(--border); border-radius: 12px;
  display: flex; gap: 8px; align-items: center; justify-content: center; color: #f6b26b;
}

/* ★ 安心メッセージの見た目 */
.assurance {
  margin: 10px auto 0; padding: 10px 12px;
  max-width: 1200px;
  background: #13271a;
  border: 1px solid #1f6d3a;
  border-radius: 12px;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  color: #baf5ba;
}
.assurance code {
  background:#0f1d15; border:1px solid #1f6d3a; padding:2px 6px; border-radius:6px; color:#c9ffcf;
}
.assurance-emoji { font-size: 20px; line-height: 1; }

.grid.two-col {
  display: grid; gap: 16px; padding: 16px 24px;
  margin: 0 auto;
  max-width: 1200px;
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 980px) {
  .grid.two-col { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.pad-wrap { display: grid; gap: 10px; justify-items: center; }
#pad {
  background: conic-gradient(from 180deg at 50% 50%, #141826, #111423);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: min(90vw, 360px);
  height: min(90vw, 360px);
  touch-action: none;
}

.pad-controls { display:flex; gap:10px; align-items:center; }
.btn {
  background: #232840; color: #e9ecff; border: 1px solid #2b3150;
  padding: 8px 12px; border-radius: 10px; cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn-secondary { background: #1d2033; color: #cfd6ff; }

.chk { color: var(--muted); font-size: 14px; user-select: none; }

.pattern-sequence {
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.report { margin-top: 12px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }

/* Radar Chart */
.radar-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
  align-items: center;
}

#radarChart {
  background: radial-gradient(circle, #1a1d2e, #0f1218);
  border: 1px solid var(--border);
  border-radius: 50%;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.3);
}

.radar-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
}

.legend-length { background: #ff6b9d; }
.legend-turns { background: #4ecdc4; }
.legend-intersections { background: #45b7d1; }
.legend-angles { background: #f9ca24; }
.legend-start { background: #6c5ce7; }
.legend-symmetry { background: #fd79a8; }

@media (max-width: 768px) {
  .radar-container {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  #radarChart {
    width: 220px;
    height: 220px;
    margin: 0 auto;
  }

  .radar-legend {
    grid-template-columns: repeat(2, 1fr);
    display: grid;
    gap: 6px;
  }
}

.score-row { display:grid; grid-template-columns: 2fr 1fr; gap: 12px; }
@media (max-width: 980px) {
  .score-row { grid-template-columns: 1fr; }
}

.score-meter { background: var(--card); border:1px solid var(--border); border-radius: 12px; padding: 12px; }
.score-bar {
  height: 22px; border-radius: 999px; background: linear-gradient(90deg, #2a2f45, #252942);
  position: relative; overflow: hidden; border: 1px solid #343a5a;
}
.score-bar .fill {
  position: absolute; left: 0; top: 0; bottom: 0; width: 0%;
  background: linear-gradient(90deg, #ff4d4f, #ff9f0a, #ffd60a, #34c759, #30d158);
  border-radius: 999px;
  transition: width .2s ease;
}
.score-bar span {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  font-weight: 700;
  z-index: 1;
}
.score-label { margin-top: 6px; color: var(--muted); }

.attack { background: var(--card); border:1px solid var(--border); border-radius: 12px; padding: 12px; }
.attack label { display:block; margin-bottom: 8px; color: var(--muted); }
.attack .guess { margin-top: 6px; }

.weights { margin-top: 12px; }
.wgrid {
  display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px;
  margin-top: 8px; color: var(--muted);
}
.wgrid label { display: grid; grid-template-columns: 1fr 120px 40px; align-items: center; gap: 8px; }
.wgrid input[type="range"] { width: 100%; }

.heat { margin-top: 14px; }
#heat {
  width: 180px; height: 180px; border-radius: 12px; border:1px solid var(--border);
  background: #151a27; display:block;
}

.save-box { margin-top: 16px; }
.save-row { display:flex; gap:10px; }
.save-row input { flex: 1 1 auto; padding: 8px 10px; border-radius: 10px; border:1px solid var(--border); background:#121628; color: var(--text); }
.save-actions { margin-top: 8px; }

.saved { margin-top: 10px; display: grid; gap: 8px; }
.saved-item {
  display:grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items:center;
  background: var(--card); border:1px solid var(--border); border-radius:10px; padding:8px;
}
.saved-item .title { font-weight: 600; }
.saved-item .meta { color: var(--muted); font-size: 12px; }

.small { color: var(--muted); font-size: 13px; }

/* Center the bottom scoring panel */
.panel-centered {
  margin: 16px auto;
  max-width: 1200px;
  padding: 0 24px;
}

/* Tab navigation */
.tab-nav {
  display: flex;
  gap: 8px;
  margin: 16px auto;
  max-width: 1200px;
  padding: 0 24px;
}

.tab-btn {
  flex: 1;
  padding: 12px 20px;
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 12px 12px 0 0;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  background: #1a1d2e;
  color: var(--text);
}

.tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Tab content */
.tab-content {
  animation: fadeIn 0.3s ease;
}

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

/* Pattern examples */
.pattern-examples h3 {
  margin: 24px 0 16px;
  font-size: 18px;
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.example-item {
  display: flex;
  gap: 12px;
  padding: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.mini-pad {
  width: 90px;
  height: 90px;
  background: #0f1218;
  border: 1px solid var(--border);
  border-radius: 8px;
  flex-shrink: 0;
}

.example-info {
  flex: 1;
}

.example-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.example-desc {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 4px;
}

.example-warn {
  color: #ff9f0a;
  font-size: 12px;
}

/* Learning sections */
.learning-section {
  margin: 32px 0;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.learning-section h3 {
  margin: 0 0 20px;
  padding: 12px 16px;
  font-size: 19px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #1e2436, #252a42);
  border-radius: 10px;
  border-left: 4px solid var(--accent);
}

.learning-section ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.learning-section li {
  margin: 0 0 16px;
  padding: 16px;
  padding-left: 48px;
  line-height: 1.8;
  background: #0f1218;
  border: 1px solid #1a1e2e;
  border-radius: 8px;
  position: relative;
  transition: all 0.2s ease;
}

.learning-section li:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.learning-section li::before {
  content: '✔';
  position: absolute;
  left: 16px;
  top: 18px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
}

.learning-section li strong {
  color: var(--accent);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 4px;
}

.learning-section ul ul {
  margin-top: 12px;
  padding-left: 0;
}

.learning-section ul ul li {
  margin: 8px 0;
  padding: 10px 16px;
  padding-left: 36px;
  background: #141922;
  border-color: #252a3e;
}

.learning-section ul ul li::before {
  content: '▸';
  background: #3a4460;
  left: 12px;
  top: 12px;
  width: 20px;
  height: 20px;
  font-size: 10px;
}

/* Accordion styles for learning sections */
.learning-accordion {
  margin: 24px 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  overflow: hidden;
}

.learning-summary {
  padding: 20px;
  background: linear-gradient(135deg, #1e2436, #252a42);
  cursor: pointer;
  list-style: none;
  font-size: 19px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.2s ease;
  user-select: none;
}

.learning-summary:hover {
  background: linear-gradient(135deg, #242940, #2a3048);
}

.learning-summary::after {
  content: '▼';
  margin-left: auto;
  transform: rotate(0deg);
  transition: transform 0.2s ease;
  color: var(--muted);
}

.learning-accordion[open] .learning-summary::after {
  transform: rotate(180deg);
}

.learning-content {
  padding: 0 20px 20px;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.learning-content ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.learning-content li {
  margin: 0 0 16px;
  padding: 16px;
  padding-left: 48px;
  line-height: 1.8;
  background: #0f1218;
  border: 1px solid #1a1e2e;
  border-radius: 8px;
  position: relative;
  transition: all 0.2s ease;
}

.learning-content li:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.learning-content li::before {
  content: '✔';
  position: absolute;
  left: 16px;
  top: 18px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
}

.learning-content li strong {
  color: var(--accent);
  font-weight: 600;
  display: inline-block;
  margin-bottom: 4px;
}

.learning-content ul ul {
  margin-top: 12px;
  padding-left: 0;
}

.learning-content ul ul li {
  margin: 8px 0;
  padding: 10px 16px;
  padding-left: 36px;
  background: #141922;
  border-color: #252a3e;
}

.learning-content ul ul li::before {
  content: '▸';
  background: #3a4460;
  left: 12px;
  top: 12px;
  width: 20px;
  height: 20px;
  font-size: 10px;
}

/* Different colored borders for user types */
.learning-accordion:nth-child(1) {
  border-left: 4px solid #30d158;
}

.learning-accordion:nth-child(2) {
  border-left: 4px solid #ff9f0a;
}

.learning-accordion:nth-child(3) {
  border-left: 4px solid #af52de;
}

/* Theme toggle button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 25px;
  background: var(--panel);
  border: 2px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.theme-toggle .sun-icon {
  display: block;
}

.theme-toggle .moon-icon {
  display: none;
}

[data-theme="light"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="light"] .theme-toggle .moon-icon {
  display: block;
}

footer { margin: 18px auto; padding-bottom: 20px; text-align: center; max-width: 1200px; }
.footer { padding:.75rem 1rem; background:#141828; border:1px solid var(--border); border-radius:.75rem; display:inline-block; }
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* score color helper */
.score-weak { color: var(--bad); }
.score-med { color: var(--warn); }
.score-strong { color: var(--ok); }

/* Help tooltips */
.help-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  background: #3a4460;
  color: white;
  border-radius: 50%;
  text-align: center;
  line-height: 18px;
  font-size: 12px;
  font-weight: bold;
  cursor: help;
  margin-left: 6px;
  transition: all 0.2s ease;
  vertical-align: middle;
  position: relative;
}

.help-icon:hover {
  background: var(--accent);
  transform: scale(1.1);
}

/* Custom tooltip */
.help-icon::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background: #1a1d2e;
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: normal;
  white-space: normal;
  width: 320px;
  word-break: keep-all;
  overflow-wrap: break-word;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.1s ease, visibility 0.1s ease;
  z-index: 100;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  line-height: 1.4;
}

.help-icon::before {
  content: '';
  position: absolute;
  bottom: 115%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #1a1d2e;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.1s ease, visibility 0.1s ease;
  z-index: 101;
}

.help-icon:hover::after,
.help-icon:hover::before {
  opacity: 1;
  visibility: visible;
}