:root {
  --p: #2563eb; --pd: #1e40af; --pl: #dbeafe; --td: #1f2937; --tm: #6b7280; --tl: #9ca3af;
  --bw: #fff; --bl: #f3f4f6; --bc: #f9fafb; --b: #e5e7eb;
  --r: 8px; --rl: 12px; --t: all .3s cubic-bezier(.4,0,.2,1);
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 20px rgba(37,99,235,0.15);
  --glass: rgba(255,255,255,.85);
}
[data-theme="dark"] {
  --p: #3b82f6; --pd: #60a5fa; --pl: #1e3a5f; --td: #f3f4f6; --tm: #9ca3af; --tl: #6b7280;
  --bw: #111827; --bl: #1f2937; --bc: #374151; --b: #374151;
  --glass: rgba(17,24,39,.9); --shadow-glow: 0 0 20px rgba(59,130,246,0.2);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--td); line-height: 1.6; background: var(--bw);
  transition: background-color 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
header {
  background: var(--glass); border-bottom: 1px solid var(--b);
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  transition: var(--t);
}
header.scrolled { box-shadow: var(--shadow-md); border-bottom-color: transparent; }
.hc {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--td); font-weight: 800; font-size: 1.5rem; transition: var(--t);
}
.logo:hover { transform: scale(1.02); }
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--p), var(--pd));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
nav ul { display: flex; list-style: none; gap: 28px; }
nav a {
  text-decoration: none; color: var(--tm); font-weight: 500; font-size: .9rem;
  transition: var(--t); position: relative; padding: 4px 0;
}
nav a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--p); transition: width 0.3s ease; border-radius: 2px;
}
nav a:hover { color: var(--p); }
nav a:hover::after { width: 100%; }
.theme-toggle {
  background: none; border: 2px solid var(--b); border-radius: 50px;
  width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.2rem; transition: var(--t); color: var(--tm);
}
.theme-toggle:hover { border-color: var(--p); color: var(--p); transform: rotate(15deg); }
.mmb { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--td); width: 44px; height: 44px; border-radius: var(--r); transition: var(--t); }
.mmb:hover { background: var(--bl); }
.hero {
  background: linear-gradient(135deg, var(--pl) 0%, var(--bw) 50%, var(--bl) 100%);
  padding: 60px 24px 40px; text-align: center; position: relative; overflow: hidden;
}
[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #111827 100%);
}
.hero::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(37,99,235,0.08) 0%, transparent 50%);
  pointer-events: none;
}
.hero-container { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(37,99,235,0.1); color: var(--p);
  padding: 8px 20px; border-radius: 50px; font-size: 0.85rem; font-weight: 600;
  margin-bottom: 24px; border: 1px solid rgba(37,99,235,0.2);
}
.hero-badge .pulse {
  width: 8px; height: 8px; background: #10b981; border-radius: 50%; animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.2)} }
.hero h1 { font-size: 2.5rem; font-weight: 900; line-height: 1.1; margin-bottom: 16px; letter-spacing: -0.02em; }
.hero h1 span { background: linear-gradient(135deg, var(--p), #7c3aed); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.1rem; color: var(--tm); margin-bottom: 24px; max-width: 600px; margin-left: auto; margin-right: auto; }
.breadcrumb {
  display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--tm); margin-bottom: 16px; justify-content: center;
}
.breadcrumb a { color: var(--p); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.tool-container { max-width: 900px; margin: 0 auto; padding: 40px 24px; }
.tool-card {
  background: var(--bw); border: 1px solid var(--b); border-radius: var(--rl);
  padding: 32px; box-shadow: var(--shadow-lg); transition: var(--t);
}
.tool-card:hover { box-shadow: var(--shadow-xl), var(--shadow-glow); }
.tool-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 24px;
  padding-bottom: 20px; border-bottom: 2px solid var(--b);
}
.tool-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--pl), rgba(37,99,235,0.1));
  border-radius: var(--r); display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: var(--p); flex-shrink: 0;
}
.tool-title-area { flex: 1; }
.tool-title-area h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 4px; }
.tool-title-area p { color: var(--tm); font-size: 0.95rem; }
.input-group { margin-bottom: 20px; }
.input-group label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 0.95rem; }
.input-group textarea {
  width: 100%; padding: 14px 16px; border: 2px solid var(--b); border-radius: var(--r);
  font-size: 1rem; font-family: inherit; background: var(--bw); color: var(--td);
  transition: var(--t); outline: none; min-height: 200px; resize: vertical;
}
.input-group textarea:focus { border-color: var(--p); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px;
  border-radius: var(--r); font-weight: 600; text-decoration: none;
  transition: var(--t); border: none; cursor: pointer; font-size: 1rem; position: relative; overflow: hidden;
}
.btn::before { content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent); transition: left 0.5s; }
.btn:hover::before { left: 100%; }
.bp { background: linear-gradient(135deg, var(--p), var(--pd)); color: white; box-shadow: 0 4px 14px rgba(37,99,235,0.3), var(--shadow-glow); }
.bp:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(37,99,235,0.4), var(--shadow-glow); }
.bs { background: var(--bw); color: var(--td); border: 2px solid var(--b); }
.bs:hover { border-color: var(--p); color: var(--p); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.result-area {
  margin-top: 24px; padding: 20px; background: var(--bl); border-radius: var(--r);
  border: 1px solid var(--b); display: none;
}
.result-area.active { display: block; animation: fadeIn 0.4s ease; }
.result-area h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.result-area pre {
  background: #1e293b; color: #e2e8f0; padding: 16px; border-radius: var(--r);
  overflow-x: auto; font-size: 0.9rem; line-height: 1.6; font-family: 'Fira Code', monospace;
  white-space: pre-wrap; word-wrap: break-word;
}
.result-area .result-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px;
}
.result-area .stat-box {
  background: var(--bw); padding: 16px; border-radius: var(--r); text-align: center; border: 1px solid var(--b);
}
.result-area .stat-box .number { font-size: 1.5rem; font-weight: 800; color: var(--p); }
.result-area .stat-box .label { font-size: 0.8rem; color: var(--tm); margin-top: 4px; }
.action-btns { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.action-btns .btn { padding: 10px 20px; font-size: 0.9rem; }
.ad {
  background: var(--bl); border: 2px dashed var(--b); border-radius: var(--r);
  display: flex; align-items: center; justify-content: center;
  color: var(--tl); font-size: .875rem; font-weight: 500; position: relative;
}
.ad::before { content: 'Advertisement'; position: absolute; top: 4px; right: 8px; font-size: .65rem; text-transform: uppercase; letter-spacing: .05em; color: var(--tl); }
.abt { max-width: 728px; height: 90px; margin: 24px auto; width: 100%; }
.aia { max-width: 336px; height: 280px; margin: 24px auto; }
.related-tools { max-width: 1280px; margin: 0 auto; padding: 60px 24px; }
.related-tools .sh { text-align: center; margin-bottom: 32px; }
.related-tools .sh h2 { font-size: 1.75rem; font-weight: 800; margin-bottom: 8px; }
.related-tools .sh p { color: var(--tm); }
.tg { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.tc {
  background: var(--bw); border: 1px solid var(--b); border-radius: var(--rl);
  padding: 24px; transition: var(--t); text-decoration: none; color: inherit;
  display: flex; flex-direction: column; position: relative; overflow: hidden;
}
.tc::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: linear-gradient(90deg, var(--p), var(--pd)); transform: scaleX(0); transition: var(--t); }
.tc:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl), var(--shadow-glow); border-color: var(--pl); }
.tc:hover::before { transform: scaleX(1); }
.tc-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
.ti {
  width: 48px; height: 48px; background: linear-gradient(135deg, var(--pl), rgba(37,99,235,0.1));
  border-radius: var(--r); display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--p); transition: var(--t); flex-shrink: 0;
}
.tc:hover .ti { background: linear-gradient(135deg, var(--p), var(--pd)); color: white; transform: scale(1.1) rotate(5deg); box-shadow: 0 8px 20px rgba(37,99,235,0.3); }
.tc h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.tc p { color: var(--tm); font-size: 0.9rem; flex: 1; line-height: 1.6; }
.tc-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--b); }
.tt { display: inline-block; padding: 4px 12px; background: var(--bl); border-radius: 20px; font-size: 0.75rem; font-weight: 600; color: var(--p); text-transform: uppercase; letter-spacing: 0.05em; }
.tt-seo { background: var(--pl); color: var(--pd); }
.tt-tech { background: #fef3c7; color: #92400e; }
.tt-ana { background: #d1fae5; color: #065f46; }
.tt-misc { background: #e0e7ff; color: #3730a3; }
.bookmark-btn { background: none; border: none; cursor: pointer; font-size: 1.2rem; color: var(--tl); transition: var(--t); padding: 4px; }
.bookmark-btn:hover { color: #f59e0b; transform: scale(1.2); }
.bookmark-btn.active { color: #f59e0b; }
.faq { background: var(--bl); padding: 60px 24px; margin-top: 40px; }
.fc { max-width: 800px; margin: 0 auto; }
.fq { background: var(--bw); border-radius: var(--r); margin-bottom: 12px; border: 1px solid var(--b); overflow: hidden; transition: var(--t); }
.fq:hover { border-color: var(--pl); }
.fqq { padding: 16px 20px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; transition: var(--t); font-size: 0.95rem; }
.fqq:hover { background: var(--bc); }
.fqq::after { content: '+'; font-size: 1.25rem; color: var(--p); transition: var(--t); width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--pl); border-radius: 50%; flex-shrink: 0; }
.fq.active .fqq::after { content: '−'; background: var(--p); color: white; }
.fqa { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; color: var(--tm); line-height: 1.7; font-size: 0.95rem; }
.fq.active .fqa { padding: 0 20px 16px; max-height: 400px; }
footer { background: #0f172a; color: var(--tl); padding: 48px 24px 24px; margin-top: 40px; }
.fco { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; }
.fb .logo { color: white; margin-bottom: 12px; }
.fb p { line-height: 1.7; margin-bottom: 16px; color: #9ca3af; font-size: 0.9rem; }
.fso { display: flex; gap: 10px; }
.fso a { width: 36px; height: 36px; background: rgba(255,255,255,0.1); border-radius: var(--r); display: flex; align-items: center; justify-content: center; color: white; text-decoration: none; transition: var(--t); font-weight: 700; font-size: 0.8rem; }
.fso a:hover { background: var(--p); transform: translateY(-3px); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
.fl h4 { color: white; font-weight: 600; margin-bottom: 16px; font-size: 0.95rem; }
.fl ul { list-style: none; }
.fl li { margin-bottom: 8px; }
.fl a { color: #9ca3af; text-decoration: none; transition: var(--t); font-size: 0.9rem; display: flex; align-items: center; gap: 6px; }
.fl a::before { content: '›'; color: var(--p); opacity: 0; transition: var(--t); }
.fl a:hover { color: white; padding-left: 4px; }
.fl a:hover::before { opacity: 1; }
.fbo { max-width: 1280px; margin: 32px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; color: #6b7280; font-size: 0.85rem; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 1024px) { .fco { grid-template-columns: 1fr 1fr; } }
@media (max-width: 768px) {
  .hero h1 { font-size: 1.75rem; }
  nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bw); border-bottom: 1px solid var(--b); padding: 16px 24px; box-shadow: var(--shadow-lg); }
  nav.active { display: block; animation: fadeInDown 0.3s ease; }
  nav ul { flex-direction: column; gap: 12px; }
  .mmb { display: flex; align-items: center; justify-content: center; }
  .fco { grid-template-columns: 1fr; gap: 24px; }
  .tg { grid-template-columns: 1fr; }
  .tool-header { flex-direction: column; text-align: center; }
  .action-btns { flex-direction: column; }
  .action-btns .btn { width: 100%; justify-content: center; }
  .result-area .result-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.5rem; }
  .tool-card { padding: 20px; }
  .result-area .result-stats { grid-template-columns: 1fr; }
}
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bl); }
::-webkit-scrollbar-thumb { background: var(--tl); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--tm); }
::selection { background: var(--pl); color: var(--pd); }
.skip-link {
  position: absolute; left: 8px; top: -60px; background: var(--p); color: #fff;
  padding: 10px 16px; border-radius: var(--r); z-index: 2000; text-decoration: none;
  font-weight: 600; font-size: 0.9rem; transition: top 0.2s ease;
}
.skip-link:focus { top: 8px; }
.content-section { max-width: 800px; margin: 0 auto; padding: 20px 24px 40px; line-height: 1.75; }
.content-section h2 { font-size: 1.5rem; font-weight: 800; margin: 36px 0 14px; }
.content-section h2:first-child { margin-top: 0; }
.content-section h3 { font-size: 1.1rem; font-weight: 700; margin: 20px 0 8px; }
.content-section p { color: var(--td); margin-bottom: 14px; }
.content-section ul, .content-section ol { margin: 0 0 16px 22px; }
.content-section li { margin-bottom: 8px; color: var(--td); }
.content-section a { color: var(--p); font-weight: 600; }
.takeaways {
  background: var(--pl); border: 1px solid rgba(37,99,235,0.25); border-radius: var(--rl);
  padding: 20px 24px; margin: 20px 0;
}
[data-theme="dark"] .takeaways { background: rgba(59,130,246,0.12); }
.takeaways h3 { margin-top: 0; }
.data-table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 0.92rem; }
.data-table th, .data-table td { border: 1px solid var(--b); padding: 10px 12px; text-align: left; }
.data-table th { background: var(--bl); font-weight: 700; }
.data-table td { color: var(--tm); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}