/* ── Variables ──────────────────────────────────────────── */
:root {
  --primary: #5b5ef4;
  --primary-dark: #4338ca;
  --primary-light: #818cf8;
  --accent: #ec4899;
  --bg: #f5f6fa;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-xlight: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow: 0 2px 8px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-hover: 0 8px 24px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --header-h: 60px;
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, h4 { line-height: 1.3; }

/* ── Layout ──────────────────────────────────────────────── */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}
.hidden { display: none !important; }

/* ── Header ──────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .2s;
}
.site-header.scrolled { box-shadow: var(--shadow); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}
.logo-icon { font-size: 22px; }
.logo-text { color: var(--text); }
.logo-accent { color: var(--primary); }

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-link {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-light);
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: #f0f0fe; }
.nav-cta {
  color: var(--primary);
  border: 1.5px solid var(--primary);
  border-radius: 20px;
  padding: 5px 14px;
  margin-left: 4px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--primary); color: #fff; }

/* Header search */
.header-search { flex: 0 0 200px; }
.search-input-small {
  width: 100%;
  padding: 7px 12px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  font-family: var(--font);
  background: #f8fafc;
  color: var(--text);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.search-input-small:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91,94,244,.1);
  background: #fff;
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  margin-left: auto;
  flex-shrink: 0;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .2s, opacity .2s;
}
.mobile-menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ──────────────────────────────────────────────── */
.hero {
  padding: 60px 0 48px;
  text-align: center;
  background: linear-gradient(160deg, #fafbff 0%, #f5f6fa 60%, #fef9ff 100%);
  border-bottom: 1px solid var(--border);
}
.hero-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 12px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 16px;
  color: var(--text-light);
  margin-bottom: 36px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* Hero search */
.hero-search { max-width: 680px; margin: 0 auto 32px; }
.search-box {
  display: flex;
  align-items: center;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 50px;
  padding: 6px 6px 6px 20px;
  box-shadow: var(--shadow);
  transition: border-color .2s, box-shadow .2s;
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(91,94,244,.12), var(--shadow);
}
.search-icon { font-size: 18px; margin-right: 8px; flex-shrink: 0; }
.search-input-large {
  flex: 1;
  border: none;
  outline: none;
  font-size: 15px;
  font-family: var(--font);
  color: var(--text);
  background: transparent;
  min-width: 0;
}
.search-input-large::placeholder { color: var(--text-xlight); }
.search-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 40px;
  flex-shrink: 0;
  transition: opacity .2s, transform .15s;
}
.search-btn:hover { opacity: .9; transform: translateY(-1px); }
.search-btn:active { transform: translateY(0); }

/* Suggestions */
.search-suggestions {
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  align-items: center;
}
.suggestion-tag {
  padding: 3px 12px;
  background: rgba(91,94,244,.08);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  transition: background .15s;
}
.suggestion-tag:hover { background: rgba(91,94,244,.15); }

/* Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.stat-label {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 2px;
}

/* ── Ad Banners ──────────────────────────────────────────── */
.ad-banner-top, .ad-banner-mid {
  margin: 24px auto;
}
.ad-placeholder {
  background: linear-gradient(135deg, #f0f4ff, #fdf0ff);
  border: 1.5px dashed var(--primary-light);
  border-radius: var(--radius);
  padding: 16px 24px;
  text-align: center;
  position: relative;
}
.ad-placeholder p { color: var(--text-light); font-size: 14px; }
.ad-placeholder a { color: var(--primary); font-weight: 600; }
.ad-placeholder a:hover { text-decoration: underline; }
.ad-label {
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 10px;
  color: var(--text-xlight);
  background: #e2e8f0;
  border-radius: 4px;
  padding: 1px 6px;
}

/* ── Section common ──────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
}
.section-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
}
.section-more {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
}
.section-more:hover { text-decoration: underline; }

/* ── Categories ──────────────────────────────────────────── */
.categories-section { padding: 40px 0 20px; }
.categories-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.category-card {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 12px 14px;
  text-align: center;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.category-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--cat-color, var(--primary));
}
.category-icon { font-size: 28px; line-height: 1; }
.category-name { font-size: 14px; font-weight: 600; color: var(--text); }
.category-count { font-size: 12px; color: var(--text-xlight); }

/* ── Tool Cards ──────────────────────────────────────────── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.tools-grid-hot {
  grid-template-columns: repeat(4, 1fr);
}

.tool-card {
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(91,94,244,.25);
}
.tool-card-promoted {
  border-color: #f59e0b44;
  background: linear-gradient(135deg, #fffef5, #fff);
}
.tool-card-promoted:hover { border-color: #f59e0b88; }

/* Avatar */
.tool-avatar {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tool-initial {
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.5px;
  text-shadow: 0 1px 3px rgba(0,0,0,.2);
}

/* Badges */
.tool-badges {
  position: absolute;
  top: 14px;
  right: 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
}
.badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
}
.badge-hot { background: #fff1f0; color: #ef4444; }
.badge-new { background: #f0fdf4; color: #16a34a; }
.badge-promoted { background: #fffbeb; color: #d97706; }

/* Tool info */
.tool-info { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.tool-name-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.tool-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.tool-company {
  font-size: 12px;
  color: var(--text-xlight);
  white-space: nowrap;
}
.tool-desc {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tool-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}
.tool-tags { display: flex; gap: 5px; flex-wrap: wrap; }
.tool-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: #f1f5f9;
  color: var(--text-light);
  border-radius: 20px;
}
.tool-free {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
}
.tool-free.free { background: #f0fdf4; color: #16a34a; }
.tool-free.paid { background: #fff7ed; color: #ea580c; }
.tool-free.freemium { background: #f0f4ff; color: var(--primary); }

/* Card footer */
.tool-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.tool-cat-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 10px;
  border: 1.5px solid;
  border-radius: 20px;
}
.tool-visit-btn {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  padding: 5px 14px;
  border: 1.5px solid var(--primary);
  border-radius: 20px;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.tool-visit-btn:hover { background: var(--primary); color: #fff; }

/* ── Sections Spacing ────────────────────────────────────── */
.hot-section { padding: 20px 0 32px; }
.all-tools-section { padding: 20px 0 40px; }

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.filter-tab {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.filter-tab:hover { border-color: var(--primary); color: var(--primary); }
.filter-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Tools count */
.tools-count { font-size: 14px; color: var(--text-light); }
.tools-count strong { color: var(--primary); }

/* No results */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}
.no-results-icon { font-size: 48px; margin-bottom: 16px; }
.no-results h3 { font-size: 18px; margin-bottom: 8px; color: var(--text); }
.no-results a { color: var(--primary); font-weight: 500; }

/* Load more */
.load-more-wrap { text-align: center; margin-top: 32px; }
.load-more-btn {
  padding: 12px 40px;
  border: 2px solid var(--primary);
  border-radius: 40px;
  color: var(--primary);
  font-size: 15px;
  font-weight: 600;
  transition: background .2s, color .2s;
}
.load-more-btn:hover { background: var(--primary); color: #fff; }

/* ── Popular Searches ────────────────────────────────────── */
.popular-searches {
  padding: 32px 0;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.search-tags {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.stag {
  padding: 6px 16px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
  transition: border-color .15s, color .15s, background .15s;
}
.stag:hover { border-color: var(--primary); color: var(--primary); background: #f0f0fe; }

/* ── Advertise Section ───────────────────────────────────── */
.advertise-section { padding: 48px 0; background: var(--bg); }
.advertise-card {
  background: linear-gradient(135deg, #5b5ef4, #7c3aed);
  border-radius: var(--radius-lg);
  padding: 44px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  color: #fff;
}
.advertise-content h2 { font-size: 24px; font-weight: 800; margin-bottom: 12px; }
.advertise-content p { opacity: .85; margin-bottom: 20px; font-size: 15px; line-height: 1.7; }
.advertise-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
  font-size: 14px;
  opacity: .9;
}
.advertise-btn {
  display: inline-block;
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  font-size: 15px;
  padding: 12px 28px;
  border-radius: 40px;
  transition: transform .2s, box-shadow .2s;
}
.advertise-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.2); }

/* Ad stats */
.ad-stats {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding: 24px 32px;
  text-align: center;
  backdrop-filter: blur(10px);
}
.ad-stat-num { font-size: 28px; font-weight: 900; }
.ad-stat-label { font-size: 12px; opacity: .75; margin-top: 2px; }

/* ── About ───────────────────────────────────────────────── */
.about-section {
  padding: 48px 0;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
}
.about-content {
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}
.about-content p { color: var(--text-light); font-size: 15px; line-height: 1.8; }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  background: #1e293b;
  color: #94a3b8;
  padding: 48px 0 28px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  margin-bottom: 36px;
}
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand .logo-text { color: #fff; }
.footer-tagline { font-size: 14px; margin-bottom: 8px; }
.footer-contact { font-size: 13px; }
.footer-contact a { color: var(--primary-light); }
.footer-contact a:hover { color: #fff; }

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 14px; }
.footer-col a {
  display: block;
  color: #94a3b8;
  font-size: 13px;
  margin-bottom: 8px;
  transition: color .15s;
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #334155;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
}
.icp a { color: #64748b; }
.icp a:hover { color: #94a3b8; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1100px) {
  .tools-grid, .tools-grid-hot { grid-template-columns: repeat(3, 1fr); }
  .categories-grid { grid-template-columns: repeat(5, 1fr); }
}

@media (max-width: 900px) {
  .categories-grid { grid-template-columns: repeat(4, 1fr); }
  .advertise-card {
    grid-template-columns: 1fr;
    padding: 32px 28px;
  }
  .ad-stats { flex-direction: row; justify-content: center; gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 20px 16px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .mobile-menu-btn { display: flex; }
  .header-search { display: none; }
  .site-header { position: relative; }

  .hero { padding: 36px 0 32px; }
  .hero-title { font-size: 26px; }
  .search-btn { padding: 9px 16px; font-size: 14px; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 22px; }

  .tools-grid, .tools-grid-hot { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .categories-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }

  .filter-tabs { gap: 6px; }
  .filter-tab { padding: 5px 12px; font-size: 12px; }

  .advertise-card { padding: 24px 20px; }
  .ad-stats { flex-direction: column; gap: 12px; }

  .footer-links { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom { flex-direction: column; text-align: center; }

  .section-title { font-size: 18px; }
}

@media (max-width: 480px) {
  .tools-grid, .tools-grid-hot { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-card { padding: 14px; }
  .tool-avatar { width: 44px; height: 44px; }
  .tool-initial { font-size: 15px; }
  .tool-name { font-size: 14px; }
  .tool-desc { -webkit-line-clamp: 2; }
  .hero-stats { gap: 16px; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .advertise-card { padding: 20px 16px; }
  .advertise-content h2 { font-size: 19px; }
}

/* ── Animations ──────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.tool-card {
  animation: fadeInUp .3s ease both;
}
.tool-card:nth-child(1) { animation-delay: .02s; }
.tool-card:nth-child(2) { animation-delay: .04s; }
.tool-card:nth-child(3) { animation-delay: .06s; }
.tool-card:nth-child(4) { animation-delay: .08s; }
.tool-card:nth-child(5) { animation-delay: .10s; }
.tool-card:nth-child(6) { animation-delay: .12s; }
.tool-card:nth-child(7) { animation-delay: .14s; }
.tool-card:nth-child(8) { animation-delay: .16s; }