:root {
  --bg: #f8fafc;
  --surface: #fff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #6366f1;
  --icon-color: #6366f1;
  --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;
}

/* ---------------- ヘッダー ---------------- */

.header {
  position: relative;
  padding: clamp(32px, 6vw, 56px) 24px clamp(24px, 4vw, 40px);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.header h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  letter-spacing: -0.02em;
}

/* タイトル左のチェックアニメ。設定の色に追従させず黒で固定する */
.title-icon {
  display: inline-flex;
  flex: none;
}

.title-icon svg {
  width: 1.5em;
  height: 1.5em;
  color: #000;
}

.header p {
  max-width: 720px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 1rem;
}

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

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

/* ---------------- レイアウト ---------------- */

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(24px, 4vw, 40px) 20px 80px;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 28px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.input-card {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.input-card h2 {
  margin: 0 0 16px;
  font-size: 1.0625rem;
}

/* ---------------- プレビュー ---------------- */

.preview {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 160px;
  margin-bottom: 12px;
  background: repeating-conic-gradient(#f1f5f9 0% 25%, #fff 0% 50%) 50% / 16px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.preview svg {
  width: 96px;
  height: 96px;
  color: var(--icon-color);
}

.preview-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.preview-name {
  font-weight: 700;
}

/* ---------------- フォーム ---------------- */

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 1rem;
}

.field select,
.field input[type="text"] {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
}

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

.color-row input[type="color"] {
  width: 52px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: none;
  cursor: pointer;
}

.color-val {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1rem;
}

/* ---------------- ボタン ---------------- */

.btn {
  display: block;
  width: 100%;
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

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

.btn-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

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

.btn-ghost {
  width: auto;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--muted);
}

.dl-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dl-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

/* ---------------- ライセンス ---------------- */

.license {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 1rem;
}

.license li {
  padding-left: 24px;
  text-indent: -24px;
}

/* ---------------- フィルタ ---------------- */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.toolbar input[type="search"] {
  flex: 1 1 200px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.chip {
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

.chip.is-active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.count-note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 1rem;
}

/* ---------------- アイコン一覧 ---------------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.12);
}

.card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.25);
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 56px;
}

.card-icon svg {
  width: 48px;
  height: 48px;
  color: var(--icon-color);
}

.card-label {
  color: var(--muted);
}

/* ---------------- 使い方ページ ---------------- */

.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: -0.01em;
}

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

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

.doc p,
.doc li {
  font-size: 1rem;
}

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

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

.doc a {
  color: var(--accent);
}

.doc code {
  padding: 2px 6px;
  border-radius: 4px;
  background: #f1f5f9;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95em;
}

.doc-code {
  overflow-x: auto;
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 8px;
  background: #1e293b;
  color: #e2e8f0;
}

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

.doc-table {
  display: block;
  overflow-x: auto;
  width: 100%;
  margin: 12px 0;
  border-collapse: collapse;
  white-space: nowrap;
}

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

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

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

/* ---------------- トースト ---------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 16px);
  padding: 12px 24px;
  border-radius: 999px;
  background: var(--text);
  color: #fff;
  font-size: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 100;
}

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

/* ---------------- フッター ---------------- */

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

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

footer a:hover {
  color: var(--accent);
}

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

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

.footer-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------------- 広告（右下フローティング 320×100） ---------------- */

.footer-ad {
  position: fixed;
  right: 0;
  bottom: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 0;
  width: 320px;
  overflow: hidden;
  background: transparent;
  border: none;
  box-shadow: none;
}

.footer-ad.is-closed {
  display: none;
}

.ad-widget__head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.ad-widget__label {
  padding: 2px 8px;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.ad-widget__close {
  appearance: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: #f1f5f9;
  color: var(--muted);
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.ad-widget__close:hover {
  background: var(--border);
  color: var(--text);
}

.footer-ad ins.adsbygoogle {
  display: block;
  width: 320px;
  height: 100px;
}

/* ---------------- レスポンシブ ---------------- */

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

  .sidebar {
    position: static;
  }
}

@media screen and (max-width: 768px) {
  footer {
    flex-direction: column;
    gap: 16px;
    padding: 24px 16px;
    text-align: center;
  }

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

  .footer-ad {
    position: static;
    align-self: center;
    margin: 24px auto 0;
    gap: 0;
    padding: 0;
    background: none;
    border: none;
    border-radius: 0;
    box-shadow: none;
    z-index: auto;
  }

  /* PCで閉じてもSPでは表示する */
  .footer-ad.is-closed {
    display: flex;
  }

  .ad-widget__head {
    display: none;
  }
}