.sec-main {
    position: relative;
    z-index: 1;
    width: min(960px, 100%);
    margin: 0 auto;
    padding: 1rem 1.5rem 4.5rem;
}

.sec-hero {
    text-align: center;
    max-width: 720px;
    margin: 1.25rem auto 2.75rem;
}

.sec-eyebrow,
.plans-eyebrow {
    display: inline-block;
    margin: 0 0 0.85rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #a5b4fc;
}

.sec-hero h1 {
    font-size: clamp(2rem, 4.2vw, 3.1rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.12;
    margin: 0 0 1rem;
}

.sec-lead {
    margin: 0;
    color: var(--text-muted);
    font-size: 1.08rem;
    line-height: 1.7;
}

.sec-section-title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: 0 0 1.25rem;
    text-align: center;
}

.sec-diagram {
    margin-bottom: 3rem;
}

.flow-block {
    margin-bottom: 1.25rem;
    padding: 1.35rem 1.25rem 1.4rem;
    border-radius: var(--radius-lg, 16px);
    border: 1px solid var(--border);
    background:
        radial-gradient(120% 90% at 0% 0%, rgba(99, 102, 241, 0.1), transparent 55%),
        var(--bg-card);
    animation: sec-rise 0.7s ease both;
}

.flow-block--key {
    background:
        radial-gradient(120% 90% at 100% 0%, rgba(16, 185, 129, 0.12), transparent 55%),
        var(--bg-card);
    animation-delay: 0.12s;
}

.flow-label {
    margin: 0 0 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.flow-track {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    justify-content: center;
    gap: 0.35rem 0.45rem;
}

.flow-node {
    flex: 1 1 120px;
    max-width: 160px;
    min-width: 110px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.35rem;
    padding: 0.85rem 0.55rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.flow-node--accent {
    border-color: rgba(129, 140, 248, 0.45);
    box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.12);
}

.flow-node--key {
    border-color: rgba(52, 211, 153, 0.35);
}

.flow-node-icon {
    width: 28px;
    height: 28px;
    color: #c7d2fe;
}

.flow-node--key .flow-node-icon {
    color: #6ee7b7;
}

.flow-node-icon svg {
    width: 100%;
    height: 100%;
}

.flow-node-title {
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    font-family: "JetBrains Mono", ui-monospace, monospace;
}

.flow-node-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.35;
}

.flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(165, 180, 252, 0.65);
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0 0.1rem;
    animation: sec-pulse-arrow 1.8s ease-in-out infinite;
}

.sec-key-callout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    margin: 1.5rem 0 0;
    padding: 1rem 1.25rem;
    border-radius: 14px;
    border: 1px solid rgba(52, 211, 153, 0.35);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(99, 102, 241, 0.08));
    font-size: clamp(1.05rem, 2.4vw, 1.35rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    text-align: center;
    animation: sec-rise 0.8s ease 0.2s both;
}

.sec-key-callout-strong {
    display: inline-block;
    margin-top: 0.25rem;
    color: #6ee7b7;
}

.sec-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 3rem;
}

.sec-pillar {
    padding: 1.25rem 1.15rem;
    border-radius: var(--radius-lg, 16px);
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.sec-pillar h3 {
    margin: 0 0 0.55rem;
    font-size: 1rem;
    letter-spacing: -0.02em;
}

.sec-pillar p {
    margin: 0;
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--text-muted);
}

.sec-faq {
    margin-bottom: 3rem;
}

.sec-faq-list {
    margin: 0;
    display: grid;
    gap: 0.85rem;
}

.sec-faq-list > div {
    padding: 1.1rem 1.2rem;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
}

.sec-faq-list dt {
    font-weight: 600;
    margin: 0 0 0.35rem;
    letter-spacing: -0.01em;
}

.sec-faq-list dd {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

.sec-faq-list a.doc-link,
a.doc-link {
    display: inline;
    color: #c7d2fe;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgba(199, 210, 254, 0.45);
    padding-bottom: 0.05em;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.sec-faq-list a.doc-link:hover,
a.doc-link:hover {
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.6);
}

.sec-cta {
    text-align: center;
    padding: 2rem 1.5rem;
    border-radius: var(--radius-lg, 16px);
    border: 1px solid rgba(99, 102, 241, 0.28);
    background:
        radial-gradient(100% 120% at 50% 0%, rgba(99, 102, 241, 0.16), transparent 60%),
        var(--bg-card);
}

.sec-cta h2 {
    margin: 0 0 0.65rem;
    font-size: clamp(1.35rem, 3vw, 1.75rem);
    letter-spacing: -0.03em;
}

.sec-cta > p {
    margin: 0 auto 1.35rem;
    max-width: 480px;
    color: var(--text-muted);
    line-height: 1.65;
}

.sec-cta-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.sec-cta-actions .btn {
    width: auto;
    margin: 0;
}

@keyframes sec-rise {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes sec-pulse-arrow {
    0%, 100% { opacity: 0.45; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(2px); }
}

@media (max-width: 800px) {
    .sec-pillars {
        grid-template-columns: 1fr;
    }
    .flow-arrow {
        width: 100%;
        transform: rotate(90deg);
        padding: 0.15rem 0;
    }
    .flow-track {
        flex-direction: column;
        align-items: stretch;
    }
    .flow-node {
        max-width: none;
        flex-direction: row;
        text-align: left;
        gap: 0.75rem;
        padding: 0.85rem 1rem;
    }
    .flow-node-icon {
        flex-shrink: 0;
    }
}