:root {
    --sl-accent: #2563eb;
    --sl-accent2: #0ea5e9;
    --sl-green: #10b981;
    --sl-yellow: #f59e0b;
    --sl-red: #ef4444;
    --sl-purple: #8b5cf6;
    --sl-bg: var(--bg1,#0d1117);
    --sl-bg2: var(--bg2,#161b22);
    --sl-bg3: var(--bg3,#1c2333);
    --sl-line: var(--line,rgba(255,255,255,.08));
    --sl-line2: var(--line2,rgba(255,255,255,.13));
    --sl-t1: var(--t1,#f0f6fc);
    --sl-t2: var(--t2,#c9d1d9);
    --sl-t3: var(--t3,#8b949e);
    --sl-r: 10px;
    --sl-r-sm: 7px;
    --sl-r-lg: 14px;
    --sl-mono: 'JetBrains Mono','Fira Code',monospace;
    --sl-shadow: 0 4px 24px rgba(0,0,0,.35);
    --sl-shadow-sm: 0 2px 10px rgba(0,0,0,.25);
}

.lh-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 28px 20px 80px;
}

/* ── Page header ── */
.lh-header {
    margin-bottom: 28px;
}

.lh-header-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--sl-t1);
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
}

    .lh-header-title i {
        color: var(--sl-accent2);
    }

.lh-header-sub {
    font-size: 14px;
    color: var(--sl-t3);
    line-height: 1.7;
}

/* ── Layout ── */
.lh-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 22px;
    align-items: start;
}

/* ── Cards ── */
.sl-card {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    overflow: hidden;
    box-shadow: var(--sl-shadow-sm);
    transition: border-color .2s;
    margin-bottom: 16px;
}

    .sl-card:last-child {
        margin-bottom: 0;
    }

    .sl-card:hover {
        border-color: var(--sl-line2);
    }

.sl-card-hd {
    padding: 13px 18px;
    border-bottom: 1px solid var(--sl-line);
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--sl-bg3);
}

.sl-card-hd-ico {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    flex-shrink: 0;
}

.ico-blue {
    background: rgba(37,99,235,.15);
    color: var(--sl-accent2);
}

.ico-green {
    background: rgba(16,185,129,.14);
    color: var(--sl-green);
}

.ico-yellow {
    background: rgba(245,158,11,.14);
    color: var(--sl-yellow);
}

.ico-purple {
    background: rgba(139,92,246,.14);
    color: var(--sl-purple);
}

.ico-cyan {
    background: rgba(14,165,233,.14);
    color: #38bdf8;
}

.sl-card-title {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--sl-t1);
}

.sl-card-sub {
    font-size: 11px;
    color: var(--sl-t3);
    margin-top: 1px;
}

.sl-card-bd {
    padding: 20px;
}

.sl-card-ft {
    padding: 12px 18px;
    border-top: 1px solid var(--sl-line);
    background: rgba(255,255,255,.01);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
}

/* ── Form ── */
.pf-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

    .pf-group:last-child {
        margin-bottom: 0;
    }

.pf-label {
    font-size: 11.5px;
    font-weight: 600;
    color: var(--sl-t2);
    display: flex;
    align-items: center;
    gap: 5px;
}

    .pf-label i {
        color: var(--sl-t3);
        font-size: 10px;
    }

.pf-req {
    color: var(--sl-red);
}

.pf-input {
    background: var(--sl-bg3);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r-sm);
    padding: 9px 12px;
    color: var(--sl-t1);
    font-size: 13px;
    font-family: inherit;
    outline: none;
    transition: border-color .18s, box-shadow .18s, background .18s;
    width: 100%;
    box-sizing: border-box;
}

    .pf-input:focus {
        border-color: var(--sl-accent);
        box-shadow: 0 0 0 3px rgba(37,99,235,.14);
        background: var(--sl-bg2);
    }

    .pf-input::placeholder {
        color: var(--sl-t3);
    }

select.pf-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

textarea.pf-input {
    resize: vertical;
    min-height: 130px;
    line-height: 1.65;
}

.pf-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

/* Alert */
.lh-alert {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 15px;
    border-radius: var(--sl-r-sm);
    font-size: 13px;
    margin-bottom: 16px;
}

    .lh-alert i {
        flex-shrink: 0;
        margin-top: 1px;
    }

.lh-alert-ok {
    background: rgba(16,185,129,.08);
    border: 1px solid rgba(16,185,129,.2);
    color: var(--sl-green);
}

.lh-alert-warn {
    background: rgba(245,158,11,.08);
    border: 1px solid rgba(245,158,11,.2);
    color: var(--sl-yellow);
}

/* ── Info cards (sidebar) ── */
.lh-info-card {
    background: var(--sl-bg2);
    border: 1px solid var(--sl-line);
    border-radius: var(--sl-r);
    overflow: hidden;
    box-shadow: var(--sl-shadow-sm);
    margin-bottom: 14px;
}

    .lh-info-card:last-child {
        margin-bottom: 0;
    }

.lh-info-hd {
    padding: 12px 16px;
    border-bottom: 1px solid var(--sl-line);
    background: var(--sl-bg3);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--sl-t1);
}

.lh-info-bd {
    padding: 16px;
}

/* Info rows */
.lh-info-row {
    display: flex;
    align-items: flex-start;
    gap: 11px;
    padding: 10px 0;
    border-bottom: 1px solid var(--sl-line);
    font-size: 13px;
}

    .lh-info-row:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }

.lh-info-ico {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
}

.lh-info-label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .4px;
    color: var(--sl-t3);
    margin-bottom: 2px;
}

.lh-info-val {
    font-size: 13px;
    font-weight: 600;
    color: var(--sl-t1);
}

/* FAQ */
.lh-faq-item {
    border-bottom: 1px solid var(--sl-line);
    padding: 10px 0;
}

    .lh-faq-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }

.lh-faq-q {
    font-size: 13px;
    font-weight: 600;
    color: var(--sl-t1);
    margin-bottom: 5px;
    display: flex;
    align-items: flex-start;
    gap: 7px;
}

    .lh-faq-q i {
        color: var(--sl-accent2);
        font-size: 11px;
        margin-top: 3px;
        flex-shrink: 0;
    }

.lh-faq-a {
    font-size: 12.5px;
    color: var(--sl-t3);
    line-height: 1.65;
    padding-left: 18px;
}

/* Quick links */
.lh-quick-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--sl-line);
    text-decoration: none;
    color: var(--sl-t2);
    font-size: 13px;
    transition: color .15s;
}

    .lh-quick-link:last-child {
        border-bottom: none;
    }

    .lh-quick-link:hover {
        color: var(--sl-accent2);
    }

    .lh-quick-link i.arrow {
        font-size: 10px;
        color: var(--sl-t3);
    }

    .lh-quick-link .left {
        display: flex;
        align-items: center;
        gap: 8px;
    }

        .lh-quick-link .left i {
            width: 14px;
            text-align: center;
            color: var(--sl-t3);
        }

    .lh-quick-link:hover .left i {
        color: var(--sl-accent2);
    }

/* Char counter */
.char-counter {
    font-size: 11px;
    color: var(--sl-t3);
    text-align: right;
    margin-top: 4px;
}

    .char-counter.warn {
        color: var(--sl-yellow);
    }

    .char-counter.limit {
        color: var(--sl-red);
    }

/* Responsive */
@media (max-width: 860px) {
    .lh-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .lh-page {
        padding: 14px 12px 60px;
    }

    .lh-header-title {
        font-size: 20px;
    }

    .pf-grid-2 {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .sl-card-hd {
        padding: 11px 14px;
    }

    .sl-card-bd {
        padding: 14px;
    }

    .sl-card-ft {
        padding: 10px 14px;
    }

        .sl-card-ft .btn {
            flex: 1;
            justify-content: center;
        }
}