.help-header {
        text-align: center;
        margin-bottom: var(--fs-spacing-2xl);
        position: relative;
    }
    
    .help-header::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 300px;
        height: 300px;
        background: radial-gradient(circle, var(--fs-accent-glow) 0%, transparent 70%);
        z-index: -1;
        pointer-events: none;
    }

    .help-header h1 {
        font-size: 3rem;
        background: var(--fs-gradient-primary);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        margin-bottom: var(--fs-spacing-sm);
    }
    
    .help-header p {
        font-size: 1.1rem;
        color: var(--fs-text-secondary);
        max-width: 600px;
        margin: 0 auto;
    }

    /* Quick navigation bar */
    .learn-nav {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        justify-content: center;
        margin-bottom: var(--fs-spacing-2xl);
        padding: 12px 16px;
        background: var(--fs-bg-elevated);
        border: 1px solid var(--fs-border);
        border-radius: var(--fs-radius-lg);
    }
    .learn-nav-item {
        padding: 6px 14px;
        font-size: 0.8rem;
        font-weight: 600;
        color: var(--fs-text-muted);
        text-decoration: none;
        border-radius: var(--fs-radius-sm);
        transition: all var(--fs-transition-fast);
    }
    .learn-nav-item:hover {
        color: var(--fs-accent);
        background: var(--fs-accent-subtle);
    }

    .help-section {
        margin-bottom: var(--fs-spacing-2xl);
        scroll-margin-top: 80px;
    }

    .help-section-title {
        display: flex;
        align-items: center;
        gap: var(--fs-spacing-sm);
        margin-bottom: var(--fs-spacing-lg);
        font-size: 1.5rem;
        color: var(--fs-text-primary);
        border-bottom: 1px solid var(--fs-border-strong);
        padding-bottom: var(--fs-spacing-sm);
    }

    .help-section-title span.icon {
        background: var(--fs-bg-elevated);
        padding: 8px;
        border-radius: var(--fs-radius-sm);
        font-size: 1.2rem;
        border: 1px solid var(--fs-border);
    }

    .grid-cards {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--fs-spacing-lg);
    }
    .grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

    .step-card {
        position: relative;
        overflow: hidden;
    }

    .step-card::before {
        content: '';
        position: absolute;
        top: 0; left: 0; width: 100%; height: 4px;
        background: var(--fs-gradient-primary);
        opacity: 0;
        transition: opacity var(--fs-transition-base);
    }

    .step-card:hover::before {
        opacity: 1;
    }

    .step-number {
        font-family: var(--fs-font-mono);
        font-size: 2.5rem;
        font-weight: 800;
        color: var(--fs-accent-subtle);
        position: absolute;
        top: 10px;
        right: 20px;
        line-height: 1;
    }

    .step-icon {
        font-size: 2rem;
        margin-bottom: var(--fs-spacing-md);
        display: inline-block;
    }

    .step-title {
        font-size: 1.2rem;
        font-weight: 600;
        margin-bottom: var(--fs-spacing-sm);
        color: var(--fs-text-primary);
    }

    .step-desc {
        font-size: 0.95rem;
        color: var(--fs-text-secondary);
        line-height: 1.6;
    }

    /* Two-column learn layout */
    .learn-two-col {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--fs-spacing-xl);
        align-items: start;
    }
    @media (max-width: 768px) {
        .learn-two-col { grid-template-columns: 1fr; }
    }

    .learn-subtitle {
        font-size: 1.05rem;
        font-weight: 700;
        color: var(--fs-text-primary);
        margin-bottom: var(--fs-spacing-sm);
        margin-top: var(--fs-spacing-md);
    }
    .learn-subtitle:first-child { margin-top: 0; }

    .learn-text {
        font-size: 0.95rem;
        color: var(--fs-text-secondary);
        line-height: 1.7;
    }
    .learn-text.mb { margin-bottom: var(--fs-spacing-lg); }

    .learn-steps {
        list-style: none;
        counter-reset: ls;
        padding-left: 0;
    }
    .learn-steps li {
        counter-increment: ls;
        position: relative;
        padding-left: 32px;
        margin-bottom: 12px;
        font-size: 0.92rem;
        color: var(--fs-text-secondary);
        line-height: 1.6;
    }
    .learn-steps li::before {
        content: counter(ls);
        position: absolute;
        left: 0; top: 1px;
        width: 22px; height: 22px;
        background: var(--fs-accent-subtle);
        color: var(--fs-accent);
        border-radius: 50%;
        font-size: 0.72rem;
        font-weight: 700;
        display: flex; align-items: center; justify-content: center;
    }

    .learn-list {
        list-style: none;
        padding-left: 0;
    }
    .learn-list li {
        padding: 6px 0 6px 24px;
        position: relative;
        font-size: 0.92rem;
        color: var(--fs-text-secondary);
        line-height: 1.5;
    }
    .learn-list li::before {
        content: '→';
        position: absolute;
        left: 0;
        color: var(--fs-accent);
        font-weight: 700;
    }

    /* Table */
    .learn-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.88rem;
        margin-top: var(--fs-spacing-sm);
    }
    .learn-table th {
        text-align: left;
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--fs-text-muted);
        padding: 8px 12px;
        border-bottom: 2px solid var(--fs-border);
    }
    .learn-table td {
        padding: 8px 12px;
        border-bottom: 1px solid var(--fs-border-subtle);
        color: var(--fs-text-secondary);
    }
    .learn-table tr:last-child td { border-bottom: none; }

    /* Envelope cards */
    .envelope-card {
        background: var(--fs-bg-elevated);
        border: 1px solid var(--fs-border);
        border-radius: var(--fs-radius-md);
        padding: 20px;
        position: relative;
    }
    .envelope-card h4 {
        font-size: 0.95rem;
        color: var(--fs-text-primary);
        margin-bottom: 6px;
    }
    .envelope-card p {
        font-size: 0.85rem;
        color: var(--fs-text-secondary);
        line-height: 1.6;
    }
    .envelope-num {
        width: 28px; height: 28px;
        background: var(--fs-gradient-primary);
        color: #fff;
        border-radius: 50%;
        display: flex; align-items: center; justify-content: center;
        font-size: 0.78rem; font-weight: 800;
        margin-bottom: 12px;
    }

    /* Signature type cards */
    .sig-type-card {
        background: var(--fs-bg-elevated);
        border: 1px solid var(--fs-border);
        border-radius: var(--fs-radius-md);
        padding: 20px;
    }
    .sig-type-card h4 {
        font-size: 0.95rem;
        color: var(--fs-text-primary);
        margin-bottom: 6px;
    }
    .sig-type-card p {
        font-size: 0.85rem;
        color: var(--fs-text-secondary);
        line-height: 1.6;
    }
    .sig-type-icon {
        font-size: 1.5rem;
        margin-bottom: 10px;
        width: 40px; height: 40px;
        display: flex; align-items: center; justify-content: center;
        border-radius: var(--fs-radius-sm);
    }
    .sig-type-icon.crypto { background: rgba(59,130,246,0.12); }
    .sig-type-icon.esign  { background: rgba(34,197,94,0.12); }
    .sig-type-icon.wallet { background: rgba(168,85,247,0.12); }

    /* Security cards */
    .security-card {
        background: var(--fs-bg-elevated);
        border: 1px solid var(--fs-border);
        border-radius: var(--fs-radius-md);
        padding: 20px;
    }
    .security-card h4 {
        font-size: 0.92rem;
        color: var(--fs-text-primary);
        margin-bottom: 6px;
    }
    .security-card p {
        font-size: 0.85rem;
        color: var(--fs-text-secondary);
        line-height: 1.6;
    }
    .security-card code {
        background: var(--fs-bg-surface, rgba(0,0,0,0.2));
        padding: 1px 5px;
        border-radius: 3px;
        font-size: 0.82rem;
    }

    /* FAQ */
    .faq-item {
        background: var(--fs-bg-elevated);
        border: 1px solid var(--fs-border);
        border-radius: var(--fs-radius-md);
        margin-bottom: var(--fs-spacing-md);
        overflow: hidden;
        transition: all var(--fs-transition-base);
    }

    .faq-item:hover {
        border-color: var(--fs-accent);
        box-shadow: var(--fs-shadow-sm);
    }

    .faq-question {
        padding: var(--fs-spacing-md) var(--fs-spacing-lg);
        font-weight: 600;
        color: var(--fs-text-primary);
        display: flex;
        justify-content: space-between;
        align-items: center;
        cursor: pointer;
    }

    .faq-answer {
        padding: 0 var(--fs-spacing-lg) var(--fs-spacing-md);
        color: var(--fs-text-secondary);
        font-size: 0.95rem;
        line-height: 1.6;
        display: none;
    }

    .faq-item.active .faq-answer {
        display: block;
    }
    
    .faq-item.active .faq-icon {
        transform: rotate(45deg);
        color: var(--fs-accent);
    }

    .faq-icon {
        transition: transform var(--fs-transition-fast);
        color: var(--fs-text-muted);
    }
    
    .callout-box {
        background: var(--fs-accent-subtle);
        border-left: 4px solid var(--fs-accent);
        padding: var(--fs-spacing-md) var(--fs-spacing-lg);
        border-radius: 0 var(--fs-radius-md) var(--fs-radius-md) 0;
        margin: var(--fs-spacing-lg) 0;
    }
    
    .callout-title {
        font-weight: 600;
        color: var(--fs-accent-hover);
        margin-bottom: 4px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    
    .callout-text {
        font-size: 0.95rem;
        color: var(--fs-text-secondary);
    }

    .platform-overview-text {
        font-size: 1.05rem;
        color: var(--fs-text-secondary);
        line-height: 1.7;
    }
    
    .platform-overview-text.mb {
        margin-bottom: var(--fs-spacing-md);
    }