.mobile-hero{padding:48px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:46px;align-items:center}
.mobile-hero h1{font-size:clamp(3.2rem,5.8vw,5.9rem);line-height:.9;letter-spacing:-.06em;margin:12px 0 20px}
.lead{font-size:1.17rem;line-height:1.65;color:#d8dde7}
.wtf{margin:20px 0;padding:15px 17px;border-left:3px solid var(--cyan);background:rgba(86,215,255,.055);border-radius:0 12px 12px 0;font-weight:850}

.fax-scene{width:min(100%,480px);justify-self:center;position:relative;height:400px;display:grid;place-items:center}
.fax-machine{position:relative;width:330px;height:255px;background:linear-gradient(145deg,#d8d6ce,#aaa9a2);border:1px solid #ebe9df;border-radius:20px;box-shadow:0 28px 60px rgba(0,0,0,.45);transform:rotate(2deg);z-index:3}
.fax-top{position:absolute;left:22px;right:22px;top:16px;height:28px;border-radius:8px;background:#797a76;display:flex;align-items:center;justify-content:space-between;padding:0 10px;color:#ddd;font-size:.65rem;font-weight:900}.fax-top i{width:52px;height:5px;background:#222;border-radius:99px}
.fax-display{position:absolute;left:24px;top:60px;width:118px;height:34px;background:#81936c;border:8px solid #35393b;border-radius:5px;display:grid;place-items:center;color:#263322;font-family:monospace;font-size:.72rem;font-weight:900}
.fax-pad{position:absolute;right:25px;top:59px;width:125px;display:grid;grid-template-columns:repeat(3,1fr);gap:5px}.fax-pad b{height:25px;border-radius:4px;background:#e7e5dc;border:1px solid #8e8e88;display:grid;place-items:center;color:#333;font-size:.65rem}
.fax-slot{position:absolute;left:28px;right:28px;bottom:45px;height:11px;background:#25282b;border-radius:3px}
.fax-paper{position:absolute;left:58px;width:214px;height:145px;bottom:-103px;background:#f5f1e8;color:#2e3236;padding:19px;box-sizing:border-box;border-radius:2px;box-shadow:0 15px 24px rgba(0,0,0,.3);display:flex;justify-content:space-between;font-family:monospace;font-size:.72rem;font-weight:900;transform:rotate(-1deg)}.fax-paper span:last-child{font-size:1.7rem;color:#b73d48}
.fax-wave{position:absolute;right:0;top:38px;display:flex;gap:6px;align-items:center;height:68px}.fax-wave i{width:4px;height:15px;background:var(--cyan);border-radius:4px;animation:wave 1s infinite ease-in-out;opacity:.55}.fax-wave i:nth-child(2){height:42px;animation-delay:.1s}.fax-wave i:nth-child(3){height:27px;animation-delay:.2s}.fax-wave i:nth-child(4){height:59px;animation-delay:.3s}.fax-wave i:nth-child(5){height:21px;animation-delay:.4s}.fax-wave i:nth-child(6){height:47px;animation-delay:.5s}.fax-wave i:nth-child(7){height:31px;animation-delay:.6s}@keyframes wave{50%{transform:scaleY(.45);opacity:1}}

.fact-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:11px;margin-top:28px}.fact{background:var(--panel);border:1px solid var(--line);border-radius:17px;padding:17px}.fact strong{display:block;color:var(--gold);font-size:1.18rem}.fact small{color:var(--muted)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:24px}
.network-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.network-card{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:22px}.network-card .g{font-size:2.45rem;font-weight:950;color:var(--cyan)}

.race-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:18px;align-items:stretch}
textarea{width:100%;box-sizing:border-box;margin:10px 0 12px;resize:vertical;min-height:128px;padding:14px;border:1px solid var(--line);border-radius:12px;background:#101720;color:#fff;font:inherit;line-height:1.5}
.fax-number{display:flex;justify-content:space-between;gap:12px;padding:12px 14px;margin-bottom:13px;border:1px solid var(--line);border-radius:11px;background:#0d121a}.fax-number span{font-size:.7rem;letter-spacing:.1em;color:var(--muted);font-weight:900}.small-note{color:var(--muted);font-size:.87rem;line-height:1.55}
.fax-transmission{min-height:320px;border-radius:22px;background:#0c121b;border:1px solid var(--line);padding:23px;display:flex;flex-direction:column;justify-content:center}
.transmission-head{display:flex;justify-content:space-between;gap:12px;font-weight:950;letter-spacing:.08em;color:var(--cyan)}
.fax-progress{height:22px;background:#111a24;border:1px solid var(--line);border-radius:99px;overflow:hidden;margin:14px 0 25px}.fax-progress div{height:100%;width:0;background:linear-gradient(90deg,var(--orange),var(--cyan));transition:width .35s ease}
.phone-line{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px}.machine-icon{font-size:2.4rem}.line-wave{height:70px;display:flex;justify-content:center;align-items:center;gap:7px;border-bottom:1px dashed #344250}.line-wave i{width:5px;height:10px;border-radius:5px;background:#506171;transition:.2s}.line-wave.active i{background:var(--cyan);animation:datawave .65s infinite ease-in-out}.line-wave.active i:nth-child(2n){height:45px;animation-delay:.1s}.line-wave.active i:nth-child(3n){height:26px;animation-delay:.2s}@keyframes datawave{50%{transform:scaleY(1.5);box-shadow:0 0 10px rgba(86,215,255,.4)}}
.fax-log{margin-top:22px;padding:13px;border-radius:11px;border:1px solid var(--line);background:#111821;color:#cad3de;font-family:monospace;font-size:.78rem;min-height:44px}

.receiver-lab{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.receiver-machine{min-height:350px;border-radius:20px;background:#0c121b;border:1px solid var(--line);display:grid;place-items:center;position:relative;overflow:hidden}
.receiver-slot{position:absolute;top:54px;width:270px;height:60px;border-radius:15px;background:#b6b5ae;border:1px solid #ddd;box-shadow:0 14px 30px rgba(0,0,0,.25)}.receiver-slot:after{content:"";position:absolute;left:28px;right:28px;bottom:8px;height:8px;border-radius:3px;background:#282c30}
.received-sheet{position:absolute;top:-180px;width:225px;min-height:210px;padding:25px;background:#f6f3e9;color:#292d31;box-shadow:0 16px 28px rgba(0,0,0,.35);transition:top 1.2s cubic-bezier(.2,.8,.2,1);font-family:monospace;box-sizing:border-box}.received-sheet.received{top:98px}.sheet-head{border-bottom:2px solid #333;padding-bottom:8px;margin-bottom:14px;font-weight:950}.received-sheet p{white-space:pre-wrap;overflow-wrap:anywhere}.received-sheet small{display:block;border-top:1px solid #999;padding-top:9px;margin-top:18px;color:#555}

.latency-lab{display:grid;grid-template-columns:1fr 1fr;gap:18px}.tonebox{min-height:290px;border-radius:20px;background:#0c121b;border:1px solid var(--line);padding:22px;display:grid;grid-template-columns:1fr 1fr;gap:10px;align-content:center}.tone-step{min-height:95px;border:1px solid var(--line);border-radius:14px;background:#18222e;color:#fff;cursor:pointer;text-align:left;padding:13px}.tone-step b{display:block;color:var(--cyan);font-size:1.5rem}.tone-step span{font-weight:900}.tone-step.active{border-color:var(--cyan);background:#14303d}.ascii-tone{margin-top:18px;padding:14px;border:1px solid var(--line);border-radius:10px;background:#0d121a;color:var(--gold);font-family:monospace;font-weight:900;letter-spacing:.08em}

.quiz-options{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}.choice{padding:14px;border:1px solid var(--line);border-radius:12px;background:#202631;color:#fff;font-weight:900;cursor:pointer}.choice.good{outline:2px solid var(--green);background:#113426}.choice.bad{outline:2px solid #ff6969;background:#3a1719}.quiz-result{min-height:44px;margin-top:14px;font-weight:850}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:15px;padding:16px 18px;margin:9px 0}.faq summary{font-weight:900;cursor:pointer}
.sources{color:var(--muted);border-top:1px solid var(--line);padding-top:20px}.sources a{color:#a9e8ff}
.next-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.next-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:19px;text-decoration:none}.next-card strong{display:block;margin:5px 0}.next-card small{color:var(--muted)}

@media(max-width:820px){
 .hero-grid,.race-grid,.receiver-lab,.latency-lab{grid-template-columns:1fr}
 .fact-strip{grid-template-columns:1fr 1fr}
 .network-cards{grid-template-columns:1fr}
 .mobile-hero h1{font-size:clamp(3rem,14vw,5rem)}
 .fax-scene{transform:scale(.82);margin:-28px 0}
 .quiz-options,.next-cards{grid-template-columns:1fr}
}