#dd-module{--dd:#1f6f78;--dd2:#174d54;--accent:#f0a128;--ink:#172233;--muted:#657180;--line:#dfe7ea;--soft:#f5f8f9;max-width:1180px;margin:25px auto;padding:0 16px;color:var(--ink);font-family:Arial,Helvetica,sans-serif}
#dd-module *{box-sizing:border-box}.dd-hero{background:linear-gradient(135deg,#173f45,#1f6f78);color:#fff;border-radius:22px;padding:34px;display:flex;justify-content:space-between;gap:24px;align-items:center;box-shadow:0 12px 30px rgba(20,50,60,.15)}
.dd-hero h1{font-size:38px;margin:7px 0 10px}.dd-hero p{font-size:18px;line-height:1.55;max-width:720px;margin:0}.dd-kicker{font-size:12px;text-transform:uppercase;letter-spacing:.11em;font-weight:800;opacity:.88}.dd-pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.dd-pills span{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);padding:7px 10px;border-radius:999px;font-weight:700;font-size:12px}
.dd-hero-diagram{min-width:300px;display:flex;align-items:center;justify-content:center}.dd-node{width:95px;height:95px;border-radius:18px;background:#fff;color:var(--ink);display:flex;flex-direction:column;align-items:center;justify-content:center;font-weight:900;box-shadow:0 8px 22px rgba(0,0,0,.18)}.dd-node small{font-weight:600;color:var(--muted)}.dd-radio{font-size:27px;margin:0 10px;color:#ffd27e}.dd-wire{width:36px;height:4px;background:#ffd27e}.dd-lamp{font-size:36px;margin-left:8px}
.dd-safety{margin:18px 0;background:#fff6e7;border:1px solid #f6d495;border-left:5px solid var(--accent);padding:14px 16px;border-radius:12px;display:flex;gap:12px;line-height:1.5}.dd-safety i{font-size:22px;color:#b87408}.dd-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0 16px}.dd-tabs button,.dd-sim-nav button{border:1px solid var(--line);background:#fff;border-radius:11px;padding:11px 14px;font-weight:800;color:#40505a;cursor:pointer}.dd-tabs button.active,.dd-sim-nav button.active{background:var(--dd);border-color:var(--dd);color:#fff}.dd-panel{display:none}.dd-panel.active{display:block}.dd-section-title{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:18px 0}.dd-section-title>div:first-child{display:flex;align-items:center;gap:10px}.dd-section-title h2{margin:0}.dd-step{width:42px;height:42px;border-radius:12px;background:#e7f2f3;color:var(--dd2);display:flex;align-items:center;justify-content:center;font-weight:900}.dd-progress{display:flex;align-items:center;gap:8px}.dd-progress>div{width:160px;height:8px;background:#e8edef;border-radius:99px;overflow:hidden}.dd-progress i{display:block;height:100%;width:0;background:var(--dd);transition:.25s}
.dd-lessons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.dd-lesson,.dd-mission{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:0 4px 15px rgba(20,50,60,.06)}.dd-lesson.done{border-color:#75b48a;background:#f7fff9}.dd-lesson header{display:flex;align-items:center;gap:10px}.dd-lesson header i{width:38px;height:38px;border-radius:10px;background:#e9f4f5;display:flex;align-items:center;justify-content:center;color:var(--dd)}.dd-lesson h3,.dd-mission h3{margin:0;font-size:19px}.dd-lesson-content{line-height:1.6;color:#42505a}.dd-callout{background:#eef8f8;border-left:4px solid var(--dd);padding:11px 13px;border-radius:8px;margin:12px 0}.dd-callout.warning{background:#fff8ea;border-left-color:var(--accent)}
.dd-btn{border:0;background:var(--dd);color:#fff;border-radius:10px;padding:10px 14px;font-weight:800;cursor:pointer;transition:.15s}.dd-btn:hover{transform:translateY(-1px);filter:brightness(.96)}.dd-btn.secondary{background:#314d58}.dd-btn.ghost{background:#eef2f3;color:#34454d}.dd-btn.dd-small{padding:8px 10px;font-size:13px}.dd-btn-validate.done{background:#398456}
.dd-sim-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.dd-sim{display:none;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.dd-sim.active{display:block}.dd-sim-grid{display:grid;grid-template-columns:320px 1fr;gap:28px;align-items:center}.dd-device-card{background:linear-gradient(#f8f9f9,#eceff0);border:2px solid #aeb9bd;border-radius:18px;padding:26px;text-align:center;min-height:240px;box-shadow:inset 0 0 0 5px #fff}.dd-device-title{font-size:26px;font-weight:900}.dd-device-meta{font-size:12px;color:var(--muted);margin-top:20px}.dd-terminal-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:45px 0 6px}.dd-terminal-row span,.dd-mini-terminals span{padding:9px 4px;background:#263840;color:#fff;border-radius:6px;font-weight:900}.dd-mini-terminals{display:flex;gap:8px;justify-content:center;margin-top:12px}.dd-radio-card:after{content:'X3D )))';display:block;color:var(--dd);font-weight:900;margin-top:14px}.dd-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0}.dd-form-stack{display:grid;gap:10px;margin:14px 0}.dd-form-grid label,.dd-form-stack label{font-weight:800;font-size:13px}.dd-form-grid select,.dd-form-stack select{display:block;width:100%;margin-top:5px;padding:10px;border:1px solid #cbd6da;border-radius:8px;background:#fff}.dd-feedback{margin-top:12px;padding:0;line-height:1.45}.dd-feedback.ok,.dd-feedback.bad{padding:10px 12px;border-radius:8px;font-weight:700}.dd-feedback.ok{background:#eaf8ef;color:#24683c}.dd-feedback.bad{background:#fff0ef;color:#a33e34}
.dd-assoc-stage{display:flex;align-items:center;justify-content:center;gap:28px;margin:25px 0}.dd-assoc-device{width:230px;border:1px solid var(--line);border-radius:16px;padding:20px;text-align:center;background:var(--soft)}.dd-led{width:15px;height:15px;border-radius:50%;background:#777;margin:14px auto;box-shadow:0 0 0 4px #e1e6e8}.dd-led.blink{background:var(--accent);box-shadow:0 0 13px var(--accent)}.dd-led.ok{background:#3d9a5e;box-shadow:0 0 13px #3d9a5e}.dd-switch{padding:10px;background:#fff;border-radius:8px;margin:10px 0}.dd-waves{font-size:30px;color:#a4afb3}.dd-waves.active{color:var(--dd);animation:pulse .7s infinite alternate}.dd-assoc-actions{text-align:center;display:flex;gap:8px;justify-content:center}.dd-topologies{display:grid;gap:10px;margin:16px 0}.dd-topologies label{padding:13px;border:1px solid var(--line);border-radius:10px;background:var(--soft);cursor:pointer}
.dd-missions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.dd-mission p{line-height:1.55;color:#4c5962}.dd-difficulty{color:#d98b11;letter-spacing:2px;font-size:13px;margin-bottom:8px}.dd-trouble{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;display:grid;grid-template-columns:120px 1fr;gap:24px}.dd-trouble-icon{width:100px;height:100px;border-radius:20px;background:#eef5f6;color:var(--dd);font-size:40px;display:flex;align-items:center;justify-content:center}.dd-fault-options{display:grid;gap:8px;margin:12px 0}.dd-fault-options button{text-align:left;border:1px solid var(--line);background:#fff;border-radius:9px;padding:10px;cursor:pointer}.dd-fault-options button.selected{border-color:var(--dd);background:#eef8f8}
.dd-quiz{display:grid;gap:12px}.dd-question{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.dd-question h3{font-size:16px;margin:0 0 12px}.dd-qchoices{display:grid;gap:7px}.dd-qchoices label{padding:9px 10px;border-radius:8px;background:var(--soft);cursor:pointer}.dd-question.good{border-color:#6eb786}.dd-question.wrong{border-color:#d8776e}.dd-explain{font-size:13px;margin-top:8px;display:none}.dd-question.corrected .dd-explain{display:block}.dd-quiz-footer{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:14px}.dd-score{font-weight:900;font-size:18px}.dd-sources{margin:22px 0 50px;padding:14px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;line-height:1.5}.dd-ad{margin:20px 0;min-height:20px}.dd-admin-link{float:right}
@keyframes pulse{from{transform:scale(1)}to{transform:scale(1.12)}}
@media(max-width:800px){.dd-hero{display:block}.dd-hero-diagram{margin-top:24px;min-width:0}.dd-lessons,.dd-missions,.dd-sim-grid{grid-template-columns:1fr}.dd-trouble{grid-template-columns:1fr}.dd-progress{display:none}.dd-hero h1{font-size:30px}.dd-assoc-stage{flex-direction:column}.dd-form-grid{grid-template-columns:1fr}}