.subnet-lesson .rl-hero-layout { grid-template-columns:1.2fr 1fr; }
.sl-hero-card { width:100%; max-width:430px; justify-self:end; padding:24px; background:linear-gradient(135deg,#17243d,#232047); border-radius:18px; color:#fff; box-shadow:0 18px 40px -24px #17243d99; }
.sl-card-kicker { display:block; font-size:10px; letter-spacing:.12em; font-weight:750; color:#c7d2fe; }
.sl-hero-ip { display:block; font-size:clamp(22px,2.8vw,34px); letter-spacing:-.025em; margin:18px 0; white-space:nowrap; }
.sl-hero-ip>span { color:#a5b4fc; }
.sl-hero-range { display:flex; justify-content:space-between; align-items:center; gap:10px; padding:15px 0; border-block:1px solid #ffffff20; }
.sl-hero-range div>span { display:block; color:#bdc8dc; font-size:11px; }
.sl-hero-range strong { font-size:14px; font-variant-numeric:tabular-nums; }
.sl-hero-card>p { font-size:13px; color:#d1daec; margin:16px 0 10px; }
.sl-card-foot { display:block; font-size:11px; color:#bdc8dc; line-height:1.7; }
.sl-home-network { border:1px solid var(--rl-line); border-radius:16px; padding:24px; background:var(--rl-paper); margin:24px 0; }
.sl-router { background:var(--rl-soft); color:var(--rl-accent); border:1px solid var(--rl-line); max-width:240px; margin:0 auto 25px; padding:14px; border-radius:12px; text-align:center; position:relative; }
.sl-router::after { content:''; position:absolute; width:1px; height:26px; background:var(--rl-line); left:50%; bottom:-26px; }
.sl-router span,.sl-device-row span { display:block; font-size:13px; }
.sl-device-row { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:10px; }
.sl-device-row>div { border:1px solid var(--rl-line); border-radius:10px; padding:14px 6px; text-align:center; background:var(--rl-bg); }
.sl-device-row strong,.sl-router strong { font-size:14px; }
.sl-home-network>p { color:var(--rl-muted); font-size:12px; margin:16px 0 0; text-align:center; }
.sl-definitions { margin:24px 0; }
.sl-definitions>div { padding:15px 0; border-bottom:1px solid var(--rl-line); }
.sl-definitions dt { font-size:14px; font-weight:800; color:var(--rl-accent); }
.sl-definitions dd { margin:5px 0 0; font-size:14px; line-height:1.9; color:var(--rl-muted); }
.subnet-lesson .rl-formula { overflow-wrap:anywhere; }
.sl-table-wrap { overflow-x:auto; border:1px solid var(--rl-line); border-radius:12px; margin:24px 0; background:var(--rl-paper); }
.sl-table { width:100%; border-collapse:collapse; min-width:530px; font-size:13px; text-align:left; }
.sl-table caption { padding:14px; font-size:12px; text-align:left; color:var(--rl-muted); }
.sl-table td,.sl-table th { padding:12px 14px; border-top:1px solid var(--rl-line); }
.sl-table thead { color:var(--rl-muted); font-size:11px; }
.sl-selected { color:var(--rl-accent); background:var(--rl-soft); font-weight:700; }
.sl-lab { padding:24px; background:var(--rl-paper); border:1px solid var(--rl-line); border-radius:16px; margin:24px 0; }
.sl-lab label { display:block; font-size:14px; font-weight:700; margin-bottom:10px; }
.sl-slider-label { margin-top:24px; }
.sl-slider-label strong { color:var(--rl-accent); margin-left:12px; }
#sl-prefix { width:100%; height:28px; accent-color:var(--rl-accent); cursor:pointer; }
.sl-lab>p { color:var(--rl-muted); font-size:12px; margin:10px 0; line-height:1.8; }
.sl-bits { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; margin:20px 0; }
.sl-bit-octet { display:flex; gap:3px; }
.sl-bit-octet span { flex:1; min-width:0; text-align:center; background:var(--rl-bg); color:var(--rl-muted); padding:5px 0; font-size:13px; border-radius:4px; }
.sl-bit-octet .is-network { background:var(--rl-soft); color:var(--rl-accent); font-weight:800; box-shadow:inset 0 -2px var(--rl-accent); }
.sl-lab-results { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.sl-lab-results>div { padding:12px; border:1px solid var(--rl-line); background:var(--rl-bg); border-radius:10px; }
.sl-lab-results dt { font-size:11px; color:var(--rl-muted); }
.sl-lab-results dd { margin:5px 0 0; font-size:15px; font-weight:800; font-variant-numeric:tabular-nums; overflow-wrap:anywhere; }
.sl-binary { margin:16px 0; padding:12px; background:var(--rl-paper); border-radius:10px; }
.sl-binary>div { display:flex; align-items:center; justify-content:space-between; gap:10px; padding:5px 0; font-size:12px; }
.sl-binary code { font:700 16px/1.5 ui-monospace,monospace; letter-spacing:2px; color:var(--rl-accent); }
.subnet-lesson .rl-player-equation { font-size:16px; }
.subnet-lesson .rl-player-result strong { font-size:20px; }
.subnet-lesson .rl-question-equation { font-size:22px; line-height:1.6; letter-spacing:-.02em; }
@media(max-width:900px) { .subnet-lesson .rl-hero-layout { grid-template-columns:1fr 1fr; gap:24px; } .sl-hero-range { align-items:flex-start; flex-direction:column; gap:6px; } .sl-hero-range>span { display:none; } }
@media(max-width:680px) {
    .subnet-lesson .rl-hero-layout { grid-template-columns:1fr; }
    .sl-hero-card { max-width:380px; justify-self:center; }
    .sl-hero-range { flex-direction:row; }
    .sl-hero-range strong { font-size:12px; }
    .sl-home-network,.sl-lab { padding:18px; }
    .sl-device-row { grid-template-columns:1fr; }
    .sl-device-row>div { display:flex; align-items:center; justify-content:space-between; gap:10px; padding:12px; }
    .sl-lab .rl-answer-row { flex-direction:column; align-items:stretch; }
    .sl-lab .rl-answer-row input { width:100%; }
    .sl-bits,.sl-lab-results { grid-template-columns:1fr; }
    .sl-bit-octet span { font-size:15px; }
    .subnet-lesson .rl-player-expression { font-size:17px; }
    .subnet-lesson .rl-question-equation { font-size:18px; }
}