:root {
  --font-body: 'Hind', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-head: 'Mukta', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --green: #00a651;
  --green-dark: #007a3d;
  --green-light: #e6f7ef;
  --gold: #f5c518;
  --dark: #0f1923;
  --dark2: #1a2535;
  --gray-50: #f8fafb;
  --gray-100: #f1f4f6;
  --gray-200: #e2e8ed;
  --gray-400: #9ca8b3;
  --gray-600: #5a6775;
  --gray-800: #2c3540;
  --text: #1e2832;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: all 0.22s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-dark); }
ul { list-style: none; }

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 700; line-height: 1.25; color: var(--gray-800); }
h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
h2 { font-size: clamp(1.3rem, 3vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }
p { color: var(--gray-600); }

.container { max-width: 1140px; margin: 0 auto; padding: 0 16px; }

.site-header {
  background: var(--dark);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(0,0,0,0.25);
  height: 62px;
  contain: layout style;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: 62px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-mark {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--green), #00c96a);
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px; color: #fff;
  font-family: var(--font-head);
  flex-shrink: 0;
}
.logo-text { line-height: 1.1; }
.logo-name { font-size: 17px; font-weight: 800; color: #fff; font-family: var(--font-head); }
.logo-tagline { font-size: 10px; color: var(--gray-400); letter-spacing: 0.5px; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  color: #ccc; padding: 7px 13px; border-radius: 7px;
  font-size: 13.5px; font-weight: 500; transition: var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { background: var(--green); color: #fff; }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }

.mobile-nav { display: none; background: var(--dark2); border-top: 1px solid rgba(255,255,255,0.08); padding: 12px 16px; }
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block; color: #ccc; padding: 10px 14px; border-radius: 8px;
  font-size: 14px; margin-bottom: 4px; transition: var(--transition);
}
.mobile-nav a:hover { background: var(--green); color: #fff; }

.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark2) 60%, #0d2a1a 100%);
  padding: 48px 16px 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute; bottom: -2px; left: 0; right: 0; height: 40px;
  background: var(--gray-50);
  clip-path: ellipse(55% 100% at 50% 100%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(0,166,81,0.18); border: 1px solid rgba(0,166,81,0.35);
  color: #4ade80; font-size: 12px; font-weight: 600;
  padding: 5px 14px; border-radius: 30px; margin-bottom: 16px; letter-spacing: 0.5px;
}
.hero h1 { color: #fff; margin-bottom: 12px; }
.hero h1 span { color: var(--gold); }
.hero p { color: #a0b0bf; font-size: 15px; max-width: 520px; margin: 0 auto 28px; }

.search-wrap {
  max-width: 540px; margin: 0 auto 32px;
  display: flex; background: #fff; border-radius: 50px; overflow: hidden;
  box-shadow: 0 6px 30px rgba(0,0,0,0.2);
}
.search-wrap input {
  flex: 1; border: none; outline: none; padding: 13px 20px;
  font-size: 14px; font-family: var(--font-body); color: var(--text); background: transparent;
}
.search-wrap button {
  background: var(--green); color: #fff; border: none; padding: 13px 24px;
  font-size: 14px; font-weight: 600; font-family: var(--font-body); cursor: pointer;
  transition: background 0.2s; white-space: nowrap;
}
.search-wrap button:hover { background: var(--green-dark); }

.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-item strong { display: block; font-size: 26px; font-weight: 800; color: var(--gold); font-family: var(--font-head); }
.stat-item span { font-size: 11px; color: var(--gray-400); text-transform: uppercase; letter-spacing: 1px; }

.ad-slot {
  background: #fff;
  border: 1.5px dashed var(--gray-200);
  border-radius: var(--radius);
  padding: 10px;
  text-align: center;
  margin: 20px 0;
  overflow: hidden;
  
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-slot-horizontal { min-height: 100px; }
.ad-slot-rectangle { min-height: 260px; }
.ad-slot ins { display: block; width: 100%; }
.ad-label { font-size: 10px; color: var(--gray-400); text-align: center; margin-bottom: 3px; }

.cat-section { padding: 30px 0 0; }
.section-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; flex-wrap: wrap; gap: 10px;
}
.section-head h2 { color: var(--gray-800); font-size: 20px; }
.section-head a { font-size: 13px; color: var(--green); font-weight: 600; }

.cat-tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 20px; scrollbar-width: none; }
.cat-tabs::-webkit-scrollbar { display: none; }
.cat-tab {
  flex-shrink: 0; padding: 7px 16px; border-radius: 20px; border: 2px solid var(--gray-200);
  background: #fff; cursor: pointer; font-size: 13px; font-weight: 600; color: var(--gray-600);
  transition: var(--transition); font-family: var(--font-body); white-space: nowrap;
}
.cat-tab:hover { border-color: var(--green); color: var(--green); }
.cat-tab.active { background: var(--green); border-color: var(--green); color: #fff; }

.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 30px; }
.tool-card {
  background: #fff; border-radius: var(--radius); padding: 18px 16px; cursor: pointer;
  transition: var(--transition); border: 2px solid transparent;
  text-decoration: none; display: block; box-shadow: var(--shadow-sm);
  
  min-height: 120px;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--green-light); }
.tool-card-icon {
  width: 48px; height: 48px; border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 11px;
}
.tool-card h3 { font-size: 14px; font-weight: 700; color: var(--gray-800); margin-bottom: 4px; }
.tool-card p { font-size: 12px; color: var(--gray-400); line-height: 1.5; }
.tool-badge {
  position: absolute; top: 10px; right: 10px;
  font-size: 9px; font-weight: 700; padding: 2px 7px; border-radius: 10px;
  text-transform: uppercase; letter-spacing: 0.4px;
}
.badge-hot { background: #fff0f0; color: #e74c3c; }
.badge-new { background: #e6f7ef; color: var(--green-dark); }
.badge-popular { background: #fff8e6; color: #b8860b; }

.tool-page { padding: 24px 0 40px; }
.breadcrumb {
  display: flex; align-items: center; gap: 6px; font-size: 12.5px;
  color: var(--gray-400); margin-bottom: 20px; flex-wrap: wrap;
}
.breadcrumb a { color: var(--green); }

.tool-layout { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; }

.tool-box { background: #fff; border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow); }
.tool-box-head {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 24px; padding-bottom: 18px; border-bottom: 2px solid var(--gray-100);
}
.tool-box-icon {
  width: 52px; height: 52px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center; font-size: 26px; flex-shrink: 0;
}
.tool-box-head h1 { font-size: 20px; color: var(--gray-800); }
.tool-box-head p { font-size: 13px; color: var(--gray-400); margin-top: 2px; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-800); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 14px; border: 2px solid var(--gray-200); border-radius: var(--radius-sm);
  font-size: 14px; font-family: var(--font-body); color: var(--text); background: #fff;
  transition: border-color 0.2s; outline: none; -webkit-appearance: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--green); }
.form-group textarea { resize: vertical; min-height: 110px; }

.btn-primary {
  display: block; width: 100%; background: var(--green); color: #fff; border: none;
  padding: 13px 24px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 700;
  font-family: var(--font-body); cursor: pointer; transition: background 0.2s; margin-top: 4px;
}
.btn-primary:hover { background: var(--green-dark); }

.result-box {
  background: var(--green-light); border: 2px solid rgba(0,166,81,0.25);
  border-radius: var(--radius); padding: 20px; margin-top: 20px; display: none;
}
.result-box.show { display: block; }
.result-box h3 { font-size: 13px; font-weight: 700; color: var(--green-dark); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.result-main { font-size: 32px; font-weight: 800; color: var(--green-dark); font-family: var(--font-head); margin-bottom: 6px; }
.result-sub { font-size: 13px; color: var(--gray-600); }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.result-item { background: #fff; border-radius: var(--radius-sm); padding: 12px; text-align: center; }
.result-item .val { font-size: 17px; font-weight: 700; color: var(--gray-800); font-family: var(--font-head); }
.result-item .lbl { font-size: 11px; color: var(--gray-400); margin-top: 2px; }

.sidebar { display: flex; flex-direction: column; gap: 18px; }
.sidebar-box { background: #fff; border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-sm); }
.sidebar-box h3 { font-size: 14px; font-weight: 700; color: var(--gray-800); margin-bottom: 12px; padding-bottom: 10px; border-bottom: 2px solid var(--gray-100); }
.related-list a {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px;
  border-radius: var(--radius-sm); transition: var(--transition); color: var(--gray-600); font-size: 13px;
}
.related-list a:hover { background: var(--green-light); color: var(--green-dark); }
.related-list .icon { font-size: 16px; }

.how-to { margin-top: 28px; }
.how-to h2 { font-size: 17px; margin-bottom: 14px; }
.step-list { display: flex; flex-direction: column; gap: 10px; }
.step-item { display: flex; gap: 12px; align-items: flex-start; }
.step-num {
  width: 28px; height: 28px; background: var(--green); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 13px;
  font-weight: 700; flex-shrink: 0; margin-top: 1px;
}
.step-item p { font-size: 14px; color: var(--gray-600); }

.tool-seo-content { margin-top: 32px; background: #fff; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.tool-seo-content h2 { font-size: 18px; margin-bottom: 12px; }
.tool-seo-content p { font-size: 14px; color: var(--gray-600); margin-bottom: 12px; line-height: 1.8; }
.faq-item { border-bottom: 1px solid var(--gray-100); padding: 14px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q {
  font-size: 14px; font-weight: 700; color: var(--gray-800); margin-bottom: 0;
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  
  color: #1e2832;
}
.faq-q::after { content: '+'; font-size: 18px; color: var(--green); flex-shrink: 0; margin-left: 8px; }
.faq-q.open::after { content: '\2212'; }
.faq-a { font-size: 13.5px; color: var(--gray-600); line-height: 1.7; display: none; margin-top: 8px; }
.faq-a.show { display: block; }

.static-page { padding: 40px 0 60px; }
.static-page .page-hero { background: var(--dark); border-radius: var(--radius-lg); padding: 40px 28px; margin-bottom: 32px; text-align: center; }
.static-page .page-hero h1 { color: #fff; margin-bottom: 8px; }
.static-page .page-hero p { color: var(--gray-400); }
.static-content { background: #fff; border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-sm); }
.static-content h2 { font-size: 18px; margin: 24px 0 10px; color: var(--gray-800); }
.static-content h2:first-child { margin-top: 0; }
.static-content p { font-size: 14px; color: var(--gray-600); line-height: 1.85; margin-bottom: 12px; }
.static-content ul { margin: 10px 0 14px 18px; list-style: disc; }
.static-content ul li { font-size: 14px; color: var(--gray-600); margin-bottom: 6px; line-height: 1.7; }
.static-content a { color: var(--green); }

.site-footer { background: var(--dark); color: #9aa5b0; padding: 48px 0 0; margin-top: 50px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 36px; }
.footer-about { max-width: 260px; }
.footer-about p { font-size: 13px; line-height: 1.8; margin-top: 12px; color: #7a8a96; }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-col ul li a { display: block; font-size: 13px; color: #7a8a96; padding: 4px 0; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--green); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.07); padding: 18px 0;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { font-size: 12px; }
.footer-bottom-links { display: flex; gap: 16px; }
.footer-bottom-links a { font-size: 12px; color: #7a8a96; }
.footer-bottom-links a:hover { color: var(--green); }

.text-green { color: var(--green); }
.text-red { color: #c0392b; }
.text-muted { color: var(--gray-400); }
.fw-700 { font-weight: 700; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }

@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .nav-menu { display: none; }
  .hamburger { display: flex; }
  .hero { padding: 36px 16px 48px; }
  .hero-stats { gap: 24px; }
  .stat-item strong { font-size: 20px; }
  .tools-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .tool-card { padding: 14px 12px; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-about { max-width: 100%; }
  .tool-box { padding: 18px 16px; }
  .result-main { font-size: 26px; }
}
@media (max-width: 360px) {
  .tools-grid { grid-template-columns: 1fr; }
}