:root {
    --bg: #F8F9FC;
    --surface: #FFFFFF;
    --surface-hover: #FAFBFF;
    --text: #1A1D26;
    --text-secondary: #5B6178;
    --text-muted: #6E7490;
    --text-light: #9198AE;
    --accent: #3B5BDB;
    --accent-dark: #2E4BB0;
    --accent-light: #EBF0FF;
    --accent-hover: #3350C4;
    --border: #E2E5F0;
    --border-light: #ECEEF5;
    --shadow-sm: 0 1px 3px rgba(59,91,219,0.04);
    --shadow-md: 0 2px 10px rgba(59,91,219,0.07);
    --shadow-lg: 0 4px 20px rgba(59,91,219,0.10);
    --radius: 12px;
    --radius-sm: 8px;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.95);
}
.header-inner { max-width: 1400px; margin: 0 auto; padding: 0 32px; height: 64px; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); flex-shrink: 0; }
.logo-icon { width: 38px; height: 38px; background: var(--accent); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: white; font-size: 18px; }
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: -0.4px; }
.logo-text span { color: var(--accent); }
.header-nav { display: flex; align-items: center; gap: 4px; }
.header-nav a { text-decoration: none; color: var(--text-secondary); font-size: 14px; font-weight: 600; padding: 8px 14px; border-radius: var(--radius-sm); transition: background 0.2s, color 0.2s; }
.header-nav a:hover, .header-nav a.active { background: var(--accent-light); color: var(--accent-dark); }
.header-auth { display: flex; align-items: center; gap: 8px; margin-left: 8px; }
.btn { display: inline-flex; align-items: center; font-family: 'Plus Jakarta Sans', sans-serif; font-size: 14px; font-weight: 600; padding: 8px 20px; border-radius: var(--radius-sm); text-decoration: none; cursor: pointer; transition: all 0.2s; border: 1.5px solid transparent; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59,91,219,0.3); }
.btn-outline { background: transparent; color: var(--text-secondary); border-color: var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

.hero { max-width: 1400px; margin: 0 auto; padding: 64px 32px 40px; text-align: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-light); color: var(--accent-dark); font-size: 13px; font-weight: 600; padding: 6px 16px; border-radius: 50px; margin-bottom: 20px; }
.hero-badge svg { width: 14px; height: 14px; }
.hero h1 { font-size: 46px; font-weight: 800; letter-spacing: -1.2px; color: var(--text); margin-bottom: 14px; line-height: 1.15; }
.hero h1 .accent { color: var(--accent); }
.hero p { font-size: 18px; color: var(--text-secondary); max-width: 560px; margin: 0 auto 36px; line-height: 1.7; }
.trust-row { display: flex; justify-content: center; align-items: center; gap: 32px; margin-bottom: 8px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-muted); font-weight: 500; }
.trust-item svg { width: 16px; height: 16px; color: var(--accent); }

.search-wrap { max-width: 580px; margin: 0 auto 16px; position: relative; }
.search-wrap svg { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); color: var(--text-muted); width: 20px; height: 20px; }
.search-input { width: 100%; padding: 15px 22px 15px 50px; font-family: 'Plus Jakarta Sans', sans-serif; font-size: 16px; border: 2px solid var(--border); border-radius: 50px; background: var(--surface); color: var(--text); outline: none; transition: border-color 0.2s, box-shadow 0.2s; }
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(59,91,219,0.1); }
.search-count { text-align: center; font-size: 13px; color: var(--text-secondary); margin-bottom: 44px; }

.filters { max-width: 1400px; margin: 0 auto 40px; padding: 0 32px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.filter-btn { font-family: 'Plus Jakarta Sans', sans-serif; font-size: 14px; font-weight: 600; padding: 9px 20px; border: 1.5px solid var(--border); border-radius: 50px; background: var(--surface); color: var(--text-secondary); cursor: pointer; transition: all 0.2s; white-space: nowrap; }
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: white; }

.main-content { max-width: 1400px; margin: 0 auto; padding: 0 32px 80px; }
.category-section { margin-bottom: 52px; }
.category-section.hidden { display: none; }
.category-header { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; padding-bottom: 14px; border-bottom: 2px solid var(--border-light); }
.category-icon { width: 42px; height: 42px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.category-header h2 { font-size: 22px; font-weight: 800; letter-spacing: -0.3px; }
.cat-count { font-size: 13px; color: var(--text-secondary); font-weight: 500; margin-left: 4px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px; }
.tool-card { background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--radius); padding: 22px 24px; text-decoration: none; color: var(--text); display: flex; align-items: flex-start; gap: 14px; transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s; cursor: pointer; }
.tool-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.tool-card-icon { width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.tool-card-content { flex: 1; min-width: 0; }
.tool-card-title { font-size: 15px; font-weight: 700; margin-bottom: 4px; line-height: 1.3; }
.tool-card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.tool-card-arrow { color: var(--text-muted); flex-shrink: 0; margin-top: 4px; transition: color 0.2s, transform 0.2s; }
.tool-card:hover .tool-card-arrow { color: var(--accent); transform: translateX(3px); }

.cat-pdf .category-icon, .cat-pdf .tool-card-icon     { background: #FEF2F2; color: #DC2626; }
.cat-image .category-icon, .cat-image .tool-card-icon { background: #F0FDF4; color: #16A34A; }
.cat-video .category-icon, .cat-video .tool-card-icon { background: #FFF7ED; color: #EA580C; }
.cat-text .category-icon, .cat-text .tool-card-icon   { background: #EBF0FF; color: #3B5BDB; }
.cat-qr .category-icon, .cat-qr .tool-card-icon       { background: #F5F3FF; color: #7C3AED; }
.cat-dev .category-icon, .cat-dev .tool-card-icon     { background: #F0FDFA; color: #0D9488; }

.no-results { text-align: center; padding: 60px 20px; display: none; }
.no-results-icon { font-size: 48px; margin-bottom: 16px; }
.no-results h3 { font-size: 18px; color: var(--text); margin-bottom: 8px; }
.no-results p { font-size: 14px; color: var(--text-secondary); }

.faq-section { max-width: 900px; margin: 0 auto; padding: 48px 32px 0; }
.faq-section h2 { font-size: 26px; font-weight: 800; letter-spacing: -0.3px; text-align: center; margin-bottom: 28px; }
.faq-item { background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.faq-question { width: 100%; padding: 18px 22px; font-family: 'Plus Jakarta Sans', sans-serif; font-size: 15px; font-weight: 700; color: var(--text); background: transparent; border: none; cursor: pointer; text-align: left; display: flex; justify-content: space-between; align-items: center; gap: 12px; transition: background 0.2s; }
.faq-question:hover { background: var(--bg); }
.faq-arrow { flex-shrink: 0; width: 20px; height: 20px; color: var(--text-light); transition: transform 0.2s; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-answer-inner { padding: 0 22px 18px; font-size: 15px; line-height: 1.7; color: var(--text-secondary); }

footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 32px; margin-top: 40px; }
.footer-inner { max-width: 1400px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-left { display: flex; align-items: center; gap: 10px; }
.footer-left .logo-icon { width: 28px; height: 28px; font-size: 13px; border-radius: 8px; }
.footer-text { font-size: 13px; color: var(--text-secondary); }
.footer-text a { color: var(--accent); text-decoration: underline; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--text-secondary); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }

.hamburger-btn { display: none; flex-direction: column; justify-content: center; align-items: center; gap: 5px; width: 40px; height: 40px; padding: 8px; background: none; border: 1.5px solid var(--border); border-radius: 8px; cursor: pointer; transition: border-color 0.2s; }
.hamburger-btn:hover { border-color: var(--accent); background: var(--accent-light); }
.hamburger-btn span { display: block; width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.hamburger-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger-btn.active span:nth-child(2) { opacity: 0; }
.hamburger-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-menu-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 98; opacity: 0; transition: opacity 0.3s; }
.mobile-menu-overlay.active { opacity: 1; }
.mobile-menu { display: none; position: fixed; top: 64px; right: 0; width: 300px; max-width: 85vw; max-height: calc(100vh - 64px); overflow-y: auto; background: var(--surface); border-left: 1px solid var(--border); box-shadow: -4px 0 24px rgba(0,0,0,0.1); z-index: 99; transform: translateX(100%); transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.mobile-menu.active { transform: translateX(0); }
.mobile-menu-section { padding: 16px 20px; border-bottom: 1px solid var(--border-light); }
.mobile-menu-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); margin-bottom: 8px; }
.mobile-menu-link { display: flex; align-items: center; gap: 10px; padding: 12px 0; text-decoration: none; color: var(--text); font-size: 15px; font-weight: 600; transition: color 0.2s; }
.mobile-menu-link:hover { color: var(--accent); }
.mobile-auth-section { padding: 16px 20px; }
.mobile-auth-btn { display: block; width: 100%; padding: 12px; font-family: 'Plus Jakarta Sans', sans-serif; font-size: 15px; font-weight: 600; border-radius: 8px; text-align: center; text-decoration: none; cursor: pointer; transition: all 0.2s; margin-bottom: 8px; }
.mobile-auth-btn-primary { background: var(--accent); color: #fff; border: none; }
.mobile-auth-btn-outline { background: transparent; color: var(--text-secondary); border: 1.5px solid var(--border); }

@media (min-width: 769px) {
    .hamburger-btn, .mobile-menu, .mobile-menu-overlay { display: none !important; }
}
@media (max-width: 768px) {
    .hamburger-btn { display: flex; }
    .header-nav, .header-auth { display: none !important; }
    .mobile-menu, .mobile-menu-overlay { display: block; }
    .header-inner { padding: 0 16px; }
    .hero { padding: 40px 20px 28px; }
    .hero h1 { font-size: 30px; }
    .hero p { font-size: 15px; }
    .filters { padding: 0 20px; justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; }
    .filters::-webkit-scrollbar { display: none; }
    .main-content { padding: 0 20px 60px; }
    .tool-grid { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-links { justify-content: center; }
    .faq-section { padding: 32px 20px 0; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 26px; }
    .search-input { font-size: 15px; padding: 12px 16px 12px 44px; }
    .trust-row { gap: 16px; }
}