:root {
    --bg: #eff6ff;
    --surface: #ffffff;
    --text: #1e3a8a;
    --muted: #64748b;
    --border: #dbeafe;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --accent: #7c3aed;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(30, 64, 175, .06), 0 6px 24px rgba(30, 64, 175, .08);
    --shadow-lg: 0 10px 40px rgba(30, 64, 175, .14);
    --max: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

img { max-width: 100%; height: auto; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--primary); color: #fff; padding: 10px 16px; z-index: 100; }
.skip-link:focus { left: 0; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; gap: 28px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; color: var(--text); }
.brand-name { font-size: 1.2rem; letter-spacing: -.02em; }
.main-nav { display: flex; gap: 20px; margin-left: auto; }
.main-nav a { color: var(--muted); font-weight: 500; font-size: .95rem; }
.main-nav a:hover { color: var(--text); text-decoration: none; }
.header-actions { display: flex; gap: 10px; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: .92rem;
    border: 1px solid transparent; cursor: pointer; transition: .18s ease; line-height: 1.2; text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-outline { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 14px 26px; font-size: 1rem; }
.btn-block { width: 100%; }

.hero {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    color: #fff; padding: 72px 0; text-align: center;
}
.hero h1 { font-size: 2.75rem; margin: 0 0 14px; letter-spacing: -.03em; line-height: 1.15; }
.hero p { font-size: 1.2rem; color: #bfdbfe; max-width: 640px; margin: 0 auto 28px; }
.hero-badge { display: inline-block; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.4); color: #fff; padding: 6px 14px; border-radius: 999px; font-size: .82rem; margin-bottom: 20px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero .btn-outline { border-color: rgba(255,255,255,.5); color: #fff; background: transparent; }
.hero .btn-outline:hover { border-color: #fff; color: #fff; }

.section { padding: 64px 0; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 2rem; margin: 0 0 10px; letter-spacing: -.02em; }
.section-head p { color: var(--muted); max-width: 620px; margin: 0 auto; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card .icon { font-size: 1.6rem; margin-bottom: 12px; }
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { color: var(--muted); margin: 0; font-size: .95rem; }

.category-grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.category-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; text-align: center; transition: transform .18s ease, border-color .18s ease; color: var(--text); display: block; }
.category-card:hover { text-decoration: none; transform: translateY(-3px); border-color: var(--primary); }
.category-card .icon { font-size: 1.9rem; display: block; margin-bottom: 8px; }
.category-card h3 { margin: 0 0 4px; font-size: 1rem; }
.category-card span { color: var(--muted); font-size: .85rem; }

.software-list { display: grid; gap: 16px; }
.software-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow); display: flex; align-items: center; gap: 18px; justify-content: space-between; transition: border-color .18s ease; }
.software-item:hover { border-color: var(--primary); }
.software-item h3 { margin: 0 0 4px; font-size: 1.05rem; }
.software-item .brand { color: var(--muted); font-size: .9rem; }
.stars { color: #f59e0b; letter-spacing: 1px; }
.software-meta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.tag { font-size: .78rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; background: #eff6ff; color: #1d4ed8; }
.tag-alt { background: #faf5ff; color: #6d28d9; }
.tag-grey { background: #f1f5f9; color: #64748b; }

.article { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow); }
.article h2 { font-size: 1.5rem; margin: 32px 0 12px; }
.article h3 { font-size: 1.2rem; margin: 24px 0 10px; }
.article p { color: #334155; margin: 0 0 16px; }
.article ul, .article ol { margin: 0 0 16px; padding-left: 22px; }
.article li { margin-bottom: 8px; }
.breadcrumb { font-size: .88rem; color: var(--muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }

.form-card { max-width: 440px; margin: 0 auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow-lg); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .9rem; }
.form-group input { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-size: .95rem; }
.form-group input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .15); }
.form-note { text-align: center; color: var(--muted); font-size: .9rem; margin-top: 16px; }
.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 18px; font-size: .92rem; }
.alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }

.site-footer { background: #1e3a8a; color: #bfdbfe; margin-top: 64px; padding: 56px 0 24px; }
.footer-grid { display: grid; gap: 32px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.footer-brand { color: #fff; margin-bottom: 12px; }
.footer-tagline { color: #93c5fd; font-size: .92rem; }
.footer-title { color: #fff; font-size: 1rem; margin: 0 0 14px; }
.footer-col a { display: block; color: #93c5fd; padding: 4px 0; font-size: .92rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; border-top: 1px solid #1d4ed8; margin-top: 40px; padding-top: 20px; color: #93c5fd; font-size: .85rem; }
.footer-bottom a { color: #93c5fd; }

.faq-item { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq-item h3 { font-size: 1.05rem; margin: 0 0 6px; }
.faq-item p { color: var(--muted); margin: 0; }

.blank-screen { min-height: 60vh; }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2rem; }
    .main-nav { display: none; }
    .header-inner { gap: 12px; }
    .software-item { flex-direction: column; align-items: flex-start; }
}