:root {
    --bg-main: #f0f3f7;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-muted: #64748b;
    --brand-blue: #3b82f6;
    --brand-blue-hover: #2563eb;
    --border-light: #e2e8f0;
    --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);
    --font-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-base);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

.wrapper {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.top-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--brand-blue);
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-item {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s;
}

.nav-item:hover { color: var(--brand-blue); }

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-fill {
    background-color: var(--brand-blue);
    color: #fff;
    border: 1px solid var(--brand-blue);
}

.btn-fill:hover {
    background-color: var(--brand-blue-hover);
    border-color: var(--brand-blue-hover);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-outline:hover {
    background-color: var(--bg-main);
    border-color: var(--text-muted);
}

/* Hero */
.hero-sec {
    padding: 80px 0 60px;
    background: linear-gradient(180deg, #ffffff 0%, var(--bg-main) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 56px;
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* Trust */
.trust-sec {
    padding: 30px 0;
    background: transparent;
}

.trust-row {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.trust-tag {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.trust-tag::before {
    content: "✓";
    color: var(--brand-blue);
    font-weight: bold;
}

/* Common Section */
.content-sec {
    padding: 80px 0;
}

.sec-head {
    text-align: center;
    margin-bottom: 50px;
}

.sec-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

/* Stats */
.stats-wrap {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-box {
    background: var(--bg-card);
    padding: 30px 20px;
    border-radius: 12px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.s-val {
    font-size: 36px;
    font-weight: 800;
    color: var(--brand-blue);
    margin-bottom: 8px;
}

.s-name {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Features */
.feat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feat-item {
    background: var(--bg-card);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
}

.feat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.f-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.f-desc {
    color: var(--text-muted);
    font-size: 15px;
}

/* Nodes */
.node-map {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.node-pill {
    background: #fff;
    border: 1px solid var(--border-light);
    padding: 12px 24px;
    border-radius: 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.n-loc { font-weight: 600; font-size: 15px; }
.n-speed { font-size: 12px; color: var(--brand-blue); }

/* Reviews */
.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.rev-card {
    background: var(--bg-card);
    border-radius: 8px;
    padding: 30px;
    border: 1px solid var(--border-light);
}

.stars { color: #f59e0b; margin-bottom: 12px; letter-spacing: 2px;}
.rev-text { font-size: 15px; font-style: italic; color: var(--text-primary); margin-bottom: 20px; }
.rev-author { font-size: 13px; color: var(--text-muted); font-weight: 600; }

/* FAQ */
.faq-block {
    max-width: 700px;
    margin: 0 auto;
}

.faq-row {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-q {
    padding: 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.faq-a {
    padding: 0 20px 20px;
    color: var(--text-muted);
    font-size: 15px;
    border-top: 1px solid var(--border-light);
    display: none;
}

.faq-a p {
    margin-top: 10px;
}

/* Footer */
.site-footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-light);
    padding: 40px 0;
    text-align: center;
}

.f-copy {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 16px;
}

.f-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.f-links a {
    color: var(--text-muted);
    font-size: 14px;
}

.f-links a:hover {
    color: var(--brand-blue);
}

@media (max-width: 768px) {
    .main-nav { display: none; }
    .hero-title { font-size: 36px; }
    .stats-wrap, .feat-grid, .review-grid { grid-template-columns: 1fr; }
    .trust-row { flex-direction: column; align-items: center; gap: 10px; }
}