:root {
  --bg: #f8fafc;
  --surface: #fff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #6366f1;
  --accent-soft: #eef2ff;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.header {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(28px, 5vw, 48px) 20px 8px;
}

.header {
  position: relative;
}

.lang-switch {
  position: absolute;
  top: 16px;
  right: 20px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
}

.lang-switch:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (max-width: 768px) {
  .header {
    padding-top: 64px;
  }
}

.header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.header p {
  max-width: 44em;
  margin: 0;
  color: var(--muted);
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px 20px 80px;
}

.picker {
  margin-bottom: 20px;
}

.picker-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.fx-search {
  flex: 1 1 240px;
  max-width: 360px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font: inherit;
}

.fx-item small {
  margin-left: 6px;
  color: var(--muted);
  font-size: 1rem;
}

.tier-tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.tier-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.tier-tab span {
  min-width: 1.6em;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--bg);
  font-size: 1rem;
  line-height: 1.5;
}

.tier-tab[aria-selected="true"] {
  background: var(--text);
  color: #fff;
}

.tier-tab[aria-selected="true"] span {
  background: rgba(255, 255, 255, 0.16);
}

.tier-note {
  margin: 12px 0;
  color: var(--muted);
}

.fx-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.fx-item {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.fx-item:hover {
  border-color: var(--accent);
}

.fx-item[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: #3730a3;
  font-weight: 700;
}

.work {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 20px;
  align-items: start;
}

.stage {
  min-width: 0;
}

.stage-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 14px;
  background: #e8ecf2;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
}

.stage-dots {
  display: inline-flex;
  gap: 6px;
}

.stage-dots i {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #cbd5e1;
}

.stage-name {
  margin-right: auto;
  font-weight: 700;
}

.themes {
  display: inline-flex;
  gap: 4px;
}

.themes button {
  padding: 4px 12px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
}

.themes button[aria-pressed="true"] {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

.stage-frame {
  display: block;
  width: 100%;
  height: clamp(440px, 60vh, 600px);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  background: #fff;
}

.stage-desc {
  margin: 12px 0 0;
  color: var(--muted);
}

.panel {
  position: sticky;
  top: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.panel h2 {
  margin: 0;
  font-size: 1.125rem;
}

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

.field[hidden] {
  display: none;
}

.field label {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
}

.field output {
  color: var(--muted);
  font-weight: 400;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.field select,
.field input[type="text"] {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.color-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.color-row input {
  width: 48px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: none;
  cursor: pointer;
}

.field-check {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

.field-check input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
}

.field-check label {
  font-weight: 400;
}

.panel-note {
  margin: 0;
  color: var(--muted);
}

.btn {
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

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

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

.btn-primary:hover {
  background: #4f46e5;
}

.code {
  margin-top: 32px;
}

.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.code-tabs {
  display: inline-flex;
  gap: 4px;
}

.code-tabs button {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.code-tabs button[aria-selected="true"] {
  border-color: var(--text);
  background: var(--text);
  color: #fff;
}

.code-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.code-actions a {
  text-decoration: none;
}

.code-actions a[hidden] {
  display: none;
}

.paste-note {
  margin: 12px 0 8px;
  color: var(--muted);
}

.code-out {
  max-height: 520px;
  margin: 0;
  padding: 20px;
  overflow: auto;
  border-radius: var(--radius);
  background: var(--code-bg);
  color: var(--code-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1rem;
  line-height: 1.6;
  tab-size: 2;
}

.about {
  max-width: 48em;
  margin-top: 40px;
}

.about h2 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.about p {
  margin: 0;
}

.about a {
  color: #4338ca;
}

.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(24px, 4vw, 40px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.doc h2 {
  margin: 40px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  letter-spacing: -0.02em;
}

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

.doc h3 {
  margin: 28px 0 8px;
  font-size: 1.0625rem;
}

.doc ul,
.doc ol {
  padding-left: 1.4em;
}

.doc li {
  margin-bottom: 6px;
}

.doc a {
  color: #4338ca;
}

.doc code {
  padding: 2px 6px;
  border-radius: 4px;
  background: #f1f5f9;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1em;
}

.doc-code {
  overflow-x: auto;
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--code-bg);
  color: var(--code-text);
}

.doc-code code {
  padding: 0;
  background: none;
  color: inherit;
}

.doc-table {
  width: 100%;
  margin: 12px 0;
  border-collapse: collapse;
}

.doc-table th,
.doc-table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.doc-table td:first-child {
  white-space: nowrap;
  font-weight: 700;
}

.doc-table th {
  background: var(--bg);
}

.doc-back {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--text);
  color: #fff;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity 0.25s, transform 0.25s;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

footer {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding: 24px 40px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: #fff;
}

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

footer a:hover {
  color: #3b82f6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links a {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
}

.footer-links a:hover {
  border-color: #3b82f6;
  color: #3b82f6;
}

@media (max-width: 900px) {
  .work {
    grid-template-columns: 1fr;
  }

  .panel {
    position: static;
  }
}

@media (max-width: 768px) {
  .tier-tabs {
    display: flex;
    overflow-x: auto;
  }

  .tier-tab {
    padding: 8px 14px;
  }

  .themes button {
    padding: 4px 8px;
  }

  .stage-dots {
    display: none;
  }

  footer {
    flex-direction: column;
    gap: 16px;
    padding: 24px 16px;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}