/* ===== CSS Variables ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --bg: #f1f5f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --warning: #d97706;
  --warning-bg: #fef9c3;
  --error: #dc2626;
  --error-bg: #fee2e2;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Yu Gothic UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
input, button { font-family: inherit; font-size: inherit; }

/* ===== Header ===== */
.site-header {
  background: var(--primary);
  color: white;
  padding: 14px 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: white;
  text-decoration: none;
}
.logo-icon { font-size: 22px; }
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: -0.3px; }
.site-tagline { font-size: 13px; color: rgba(255,255,255,0.75); }

/* ===== Main ===== */
.site-main { min-height: calc(100vh - 140px); padding: 30px 0; }

/* ===== Container ===== */
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ===== Hero ===== */
.hero { text-align: center; margin-bottom: 32px; }
.hero-title { font-size: 32px; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.hero-desc { color: var(--text-muted); font-size: 16px; }

/* ===== Tabs ===== */
.tabs-wrapper {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: 40px;
}
.tab-nav {
  display: flex;
  overflow-x: auto;
  border-bottom: 2px solid var(--border);
  background: var(--bg);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 20px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 13.5px;
  color: var(--text-muted);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
  flex-shrink: 0;
}
.tab-btn:hover { color: var(--primary); background: var(--primary-light); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab-icon { font-size: 16px; }

/* ===== Tab Pane ===== */
.tab-pane { display: none; padding: 28px; }
.tab-pane.active { display: block; }

/* ===== Tool Card ===== */
.tool-card { margin-bottom: 20px; }
.tool-title { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.tool-desc { color: var(--text-muted); font-size: 13.5px; margin-bottom: 16px; }

/* ===== Form ===== */
.form-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}
.form-group { margin-bottom: 12px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.url-input {
  flex: 1;
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  background: var(--surface);
  color: var(--text);
}
.url-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.url-input::placeholder { color: #a0aec0; }
.btn-check {
  padding: 11px 28px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-check:hover { background: var(--primary-dark); }
.btn-check:active { transform: translateY(1px); }
.btn-check:disabled { opacity: 0.6; cursor: not-allowed; }

/* ===== Result Card ===== */
.result-card {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  min-height: 80px;
  background: var(--bg);
}
.result-placeholder { color: var(--text-muted); font-size: 14px; text-align: center; padding: 16px; }

/* ===== Result Table ===== */
.result-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.result-table th, .result-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.result-table th {
  width: 200px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface);
  white-space: nowrap;
}
.result-table td { color: var(--text); word-break: break-all; }
.result-table tr:last-child th, .result-table tr:last-child td { border-bottom: none; }

/* Keyword/Links Table */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  background: var(--primary);
  color: white;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.data-table td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tr:nth-child(even) td { background: var(--bg); }
.data-table tr:hover td { background: var(--primary-light); }

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.6;
}
.badge-ok { background: var(--success-bg); color: var(--success); }
.badge-warn { background: var(--warning-bg); color: var(--warning); }
.badge-err { background: var(--error-bg); color: var(--error); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* ===== State ===== */
.na { color: var(--text-muted); font-style: italic; font-size: 13px; }
.loading { text-align: center; padding: 40px; color: var(--text-muted); }
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  margin: 0 auto 14px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.error-msg {
  background: var(--error-bg);
  border: 1px solid #fca5a5;
  border-radius: 8px;
  padding: 14px 16px;
  color: var(--error);
  font-size: 14px;
}
.result-summary {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.summary-badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}
.raw-block {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 16px;
  font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 12px;
  line-height: 1.7;
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 16px;
}

/* ===== Features Section ===== */
.features { margin-top: 10px; }
.features-title { font-size: 22px; font-weight: 700; margin-bottom: 20px; text-align: center; color: var(--text); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
}
.feature-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.feature-icon { font-size: 28px; margin-bottom: 10px; }
.feature-item h3 { font-size: 14px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.feature-item p { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

/* ===== SEO Content Sections ===== */
.seo-guide,
.howto,
.faq,
.page-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}
.seo-guide,
.howto,
.faq {
  margin-top: 24px;
  padding: 28px;
}
.seo-guide h2,
.howto h2,
.faq h2,
.page-header h1 {
  font-size: 22px;
  line-height: 1.35;
  margin-bottom: 14px;
}
.seo-guide > p,
.howto li,
.faq p,
.content-body p,
.content-body li {
  color: var(--text);
  line-height: 1.85;
}
.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.guide-block {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  background: #f8fafc;
}
.guide-block h3 {
  font-size: 16px;
  margin-bottom: 8px;
}
.guide-block p {
  color: var(--text-muted);
  font-size: 14px;
}
.howto ol {
  padding-left: 22px;
}
.howto li + li {
  margin-top: 8px;
}
.faq details {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}
.faq details:last-child {
  border-bottom: 1px solid var(--border);
}
.faq summary {
  cursor: pointer;
  font-weight: 700;
}
.faq p {
  margin-top: 10px;
  color: var(--text-muted);
}

/* ===== Single Pages ===== */
.page-content {
  max-width: 880px;
  margin: 0 auto;
  padding: 34px;
}
.page-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  padding-bottom: 18px;
}
.page-header p {
  color: var(--text-muted);
}
.content-body h2 {
  font-size: 20px;
  margin: 30px 0 12px;
}
.content-body h3 {
  font-size: 17px;
  margin: 22px 0 8px;
}
.content-body ul,
.content-body ol {
  padding-left: 22px;
  margin: 10px 0 18px;
}
.content-body hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

/* ===== Footer ===== */
.site-footer {
  background: #1e293b;
  color: rgba(255,255,255,0.6);
  padding: 24px 0;
  margin-top: 40px;
  font-size: 13px;
}
.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-nav a { color: rgba(255,255,255,0.5); margin-left: 16px; }
.footer-nav a:hover { color: white; }

/* ===== WASM ステータスバー ===== */
.wasm-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-weight: 500;
}
.wasm-status.loading {
  background: #fef9c3;
  color: #92400e;
  border: 1px solid #fde68a;
}
.wasm-status.ready {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}
.wasm-status.error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}
@keyframes spin { to { transform: rotate(360deg); } }
.spinner-inline {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

/* ===== PDF ダウンロードボタン ===== */
.btn-pdf-wrap {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 14px;
}
.btn-pdf {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: #dc2626;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}
.btn-pdf:hover { background: #b91c1c; }
.btn-pdf:active { transform: translateY(1px); }
.btn-pdf:disabled { opacity: 0.6; cursor: not-allowed; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero-title { font-size: 24px; }
  .tab-label { display: none; }
  .tab-btn { padding: 12px 14px; }
  .tab-icon { font-size: 18px; }
  .tab-pane { padding: 20px 16px; }
  .form-row { flex-direction: column; }
  .btn-check { width: 100%; }
  .result-table th { width: 130px; font-size: 13px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .seo-guide,
  .howto,
  .faq,
  .page-content { padding: 22px 18px; }
  .guide-grid { grid-template-columns: 1fr; }
}