:root {
    font-family: Tahoma, Arial, sans-serif;
    color: #221d16;
    background: #eee9df;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at top, #f7f2e7 0, #ded7ca 62%, #c8c0b2 100%); }
button, input, select { font: inherit; }
button { cursor: pointer; }
.app-shell { min-height: 100vh; }
.topbar { background: #191815; color: #eee6d4; padding: 12px clamp(14px, 4vw, 40px); border-bottom: 4px solid #7c633c; }
.topbar div { max-width: 1180px; margin: auto; display:flex; gap:18px; align-items:baseline; }
.topbar strong { letter-spacing:.08em; text-transform:uppercase; }
.topbar span { opacity:.7; font-size:.84rem; }
.enigma-page { max-width: 1180px; margin: 0 auto; padding: clamp(14px, 3vw, 30px); outline:none; }
.hero { display:flex; justify-content:space-between; gap:24px; align-items:flex-end; margin-bottom:20px; }
.hero h1 { margin:4px 0 8px; font-family: Georgia, serif; font-size:clamp(2rem,5vw,3.6rem); font-weight:600; }
.hero p { max-width:760px; margin:0; line-height:1.55; color:#51493e; }
.eyebrow { font-size:.72rem; letter-spacing:.16em; text-transform:uppercase; font-weight:bold; color:#876d42; }
.mode-switch { display:flex; background:#24221d; padding:5px; border-radius:9px; box-shadow:0 3px 12px #0002; }
.mode-button { border:0; padding:10px 20px; background:transparent; color:#bdb4a3; border-radius:6px; font-weight:bold; }
.mode-button.selected { background:#b49358; color:#16130e; }
.error-panel { background:#fff0ec; border:1px solid #b85945; color:#76301f; padding:12px 16px; border-radius:7px; margin-bottom:16px; }
.machine-shell { background:linear-gradient(#3a3025,#211b15); border:10px solid #6d4a2e; border-radius:18px; padding:clamp(18px,4vw,36px); box-shadow:0 18px 45px #21170d55, inset 0 0 0 2px #b78d58; color:#e8dec7; }
.machine-plaque { text-align:center; color:#cbb383; letter-spacing:.12em; border-bottom:1px solid #786246; padding-bottom:15px; margin-bottom:20px; }
.machine-plaque span { display:block; font-family:Georgia,serif; font-size:clamp(1.05rem,2.8vw,1.55rem); }
.machine-plaque small { display:block; opacity:.6; margin-top:5px; letter-spacing:.08em; }
.rotor-bank { display:grid; gap:clamp(8px,3vw,28px); max-width:730px; margin:0 auto 28px; }
.rotor-bank.four { grid-template-columns:repeat(4,1fr); }
.rotor-bank.three { grid-template-columns:repeat(3,1fr); max-width:570px; }
.rotor-unit { text-align:center; min-width:0; }
.rotor-title { font-size:.65rem; letter-spacing:.12em; text-transform:uppercase; opacity:.66; margin-bottom:6px; }
.rotor-wheel { background:linear-gradient(90deg,#b3aa94,#f0eadb 18%,#d3cbb8 52%,#9b927f); border:3px solid #191611; border-radius:8px; color:#15130f; box-shadow:inset 0 0 12px #0005,0 5px 10px #0006; overflow:hidden; }
.rotor-wheel span { display:block; }
.rotor-neighbour { font-size:.68rem; padding:5px; opacity:.5; }
.rotor-window { background:#f5ecd8; border-top:1px solid #766d5d; border-bottom:1px solid #766d5d; font-family:Georgia,serif; font-size:clamp(1.8rem,6vw,3rem); line-height:1.25; font-weight:bold; }
.rotor-name { display:inline-block; margin-top:7px; min-width:52px; padding:3px 8px; border:1px solid #947a52; border-radius:3px; font-weight:bold; color:#d3bd92; }
.section-title { text-align:center; text-transform:uppercase; letter-spacing:.18em; font-size:.7rem; color:#a99370; margin:18px 0 10px; }
.lampboard, .keyboard { max-width:760px; margin:auto; }
.lamp-row, .key-row { display:flex; justify-content:center; gap:clamp(5px,1.3vw,13px); margin:9px 0; }
.lamp { width:clamp(30px,6.3vw,55px); aspect-ratio:1; border-radius:50%; background:#151411; border:2px solid #5c5346; display:grid; place-items:center; color:#918a7d; font-family:Georgia,serif; font-weight:bold; font-size:clamp(.78rem,2.3vw,1.15rem); box-shadow:inset 0 0 8px #000; transition:.08s ease; }
.lamp.lit { background:#ffe793; color:#302612; border-color:#f6d673; box-shadow:0 0 12px #ffdc69,0 0 28px #ffcb4588,inset 0 0 5px white; }
.enigma-key { width:clamp(32px,6.7vw,58px); aspect-ratio:1; border-radius:50%; border:3px solid #a49a85; background:radial-gradient(circle at 40% 30%,#38352f,#111); color:#f4eee1; font-weight:bold; font-size:clamp(.8rem,2.3vw,1.1rem); box-shadow:0 5px 0 #090806,0 7px 8px #0008; touch-action:manipulation; }
.enigma-key:active { transform:translateY(4px); box-shadow:0 1px 0 #090806; }
.message-panel, .panel { background:#faf7f0; border:1px solid #cfc5b4; border-radius:12px; padding:20px; box-shadow:0 6px 18px #59483114; }
.message-panel { margin-top:18px; display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.message-panel label,.field-label { display:block; font-size:.72rem; text-transform:uppercase; letter-spacing:.12em; color:#7a6749; font-weight:bold; margin-bottom:6px; }
.message-tape { min-height:58px; background:#e8e2d7; border:1px solid #c5bbab; border-radius:6px; padding:12px; font-family:"Courier New",monospace; font-size:1.05rem; line-height:1.55; word-break:break-word; }
.message-tape.output { background:#fffaf0; font-weight:bold; }
.button-row { grid-column:1/-1; display:flex; flex-wrap:wrap; gap:8px; }
.action { border:1px solid #9d8a6c; background:#f6f0e5; color:#3d3429; padding:9px 13px; border-radius:6px; }
.action.primary { background:#3b3429; color:#fff7e8; border-color:#3b3429; }
.keyboard-hint { grid-column:1/-1; margin:0; color:#756b5d; font-size:.83rem; }
.lower-grid { display:grid; grid-template-columns:1.25fr .75fr; gap:18px; margin-top:18px; }
.panel-heading { display:flex; align-items:flex-start; justify-content:space-between; gap:14px; margin-bottom:18px; }
h2 { font-family:Georgia,serif; margin:3px 0 0; font-size:1.6rem; }
h3 { margin:20px 0 9px; font-size:.82rem; text-transform:uppercase; letter-spacing:.1em; color:#69593f; }
.settings-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.setting-field label { display:block; font-size:.75rem; margin-bottom:5px; color:#665a48; }
.number-grid { display:grid; gap:10px; }
.number-grid.four { grid-template-columns:repeat(4,1fr); }
.number-grid.three { grid-template-columns:repeat(3,1fr); }
.setting-field input,.setting-field select { width:100%; border:1px solid #b9ae9c; border-radius:5px; background:white; min-height:36px; padding:6px 8px; }
.help { margin:7px 0 0; font-size:.78rem; color:#796f61; }
.empty-trace { border:1px dashed #b8ab96; border-radius:8px; padding:30px 20px; color:#817766; text-align:center; }
.trace-summary { display:flex; justify-content:space-between; align-items:center; background:#332d24; color:#f8eddb; border-radius:7px; padding:12px 14px; gap:12px; }
.trace-summary strong { font-size:1.25rem; }
.trace-summary span { font-size:.76rem; opacity:.75; }
.trace-list { margin-top:10px; display:grid; gap:5px; }
.trace-stage { display:flex; justify-content:space-between; gap:15px; padding:7px 9px; background:#eee8dc; border-radius:4px; font-size:.8rem; }
.trace-stage strong { font-family:"Courier New",monospace; }
.lesson-note { margin-top:18px; padding-top:1px; border-top:1px solid #ddd3c3; color:#5f5547; line-height:1.55; font-size:.9rem; }
.classroom-panel { margin-top:18px; line-height:1.6; }
.classroom-panel p:last-child { margin-bottom:0; }
@media (max-width: 800px) {
    .hero { align-items:flex-start; flex-direction:column; }
    .lower-grid { grid-template-columns:1fr; }
    .settings-grid { grid-template-columns:repeat(2,1fr); }
    .message-panel { grid-template-columns:1fr; }
    .button-row,.keyboard-hint { grid-column:1; }
}
@media (max-width: 520px) {
    .topbar span { display:none; }
    .enigma-page { padding:10px; }
    .machine-shell { border-width:6px; padding:14px 7px 18px; border-radius:12px; }
    .rotor-bank { gap:6px; }
    .rotor-name { min-width:0; width:100%; padding:3px 2px; font-size:.73rem; }
    .rotor-title { font-size:.58rem; }
    .lamp-row,.key-row { gap:4px; margin:7px 0; }
    .lamp { width:9.5vw; max-width:42px; }
    .enigma-key { width:9.8vw; max-width:44px; border-width:2px; }
    .settings-grid { grid-template-columns:1fr 1fr; }
    .number-grid.four { grid-template-columns:repeat(4,1fr); gap:5px; }
    .panel,.message-panel { padding:14px; }
    .panel-heading { flex-direction:column; }
    .panel-heading .action { width:100%; }
    .trace-summary { align-items:flex-start; flex-direction:column; }
}


/* v4 visual/classroom enhancements */
.hero-actions { display:flex; flex-direction:column; gap:8px; align-items:stretch; min-width:190px; }
.presentation-button { border:1px solid #8d7652; background:#f6f0e5; color:#3d3429; padding:9px 12px; border-radius:7px; font-weight:bold; }
.presentation-button.selected { background:#6e5530; color:#fff8e9; }
.machine-status { max-width:760px; margin:0 auto 14px; display:flex; justify-content:center; flex-wrap:wrap; gap:8px; }
.machine-status span { border:1px solid #695b47; background:#19171388; color:#a99a82; border-radius:999px; padding:5px 10px; font-size:.7rem; text-transform:uppercase; letter-spacing:.08em; }
.machine-status strong { color:#f0dfbd; margin-left:4px; }
.plugboard-visual { display:flex; flex-wrap:wrap; gap:7px; margin-top:11px; padding:12px; background:#29241d; border-radius:8px; min-height:48px; align-items:center; }
.plug-pair { display:flex; align-items:center; gap:3px; color:#f3e7d2; }
.plug-pair b { display:grid; place-items:center; width:25px; height:25px; border-radius:50%; border:1px solid #b49b73; background:#111; font-size:.75rem; }
.plug-pair i { width:14px; height:2px; background:#b49b73; display:block; }
.plugboard-empty { color:#9d917e; font-size:.78rem; }
.how-panel { margin-top:18px; }
.concept-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:10px; margin-top:14px; }
.concept-grid article { position:relative; background:#eee7da; border:1px solid #d2c5b2; border-radius:8px; padding:14px; min-height:145px; }
.concept-grid article > strong { display:grid; place-items:center; width:28px; height:28px; border-radius:50%; background:#3a3227; color:#fff1d8; }
.concept-grid h3 { margin:12px 0 6px; }
.concept-grid p { margin:0; line-height:1.45; color:#655a4a; font-size:.85rem; }
.presentation-mode .hero p, .presentation-mode .message-panel, .presentation-mode .lower-grid, .presentation-mode .how-panel, .presentation-mode .classroom-panel { display:none; }
.presentation-mode { max-width:1400px; }
.presentation-mode .machine-shell { min-height:calc(100vh - 190px); display:flex; flex-direction:column; justify-content:center; }
.presentation-mode .rotor-bank { max-width:900px; }
.presentation-mode .lampboard, .presentation-mode .keyboard { max-width:940px; }
.presentation-mode .lamp { max-width:68px; }
.presentation-mode .enigma-key { max-width:70px; }
@media (max-width: 800px) {
    .hero-actions { width:100%; min-width:0; }
    .concept-grid { grid-template-columns:repeat(2,1fr); }
}
@media (max-width: 520px) {
    .concept-grid { grid-template-columns:1fr; }
    .machine-status { gap:4px; }
    .machine-status span { font-size:.58rem; padding:4px 7px; }
    .presentation-mode .machine-shell { min-height:auto; }
}

/* v5 guided Learn Enigma course */
.topbar-inner { max-width:1180px; margin:auto; display:flex; align-items:center; justify-content:space-between; gap:22px; }
.topbar .brand-block { display:flex; gap:18px; align-items:baseline; }
.main-nav { display:flex; gap:6px; }
.main-nav a { color:#cfc6b5; text-decoration:none; padding:7px 11px; border-radius:6px; font-size:.82rem; }
.main-nav a.active { background:#b49358; color:#17130e; font-weight:bold; }
.learn-button { display:block; text-align:center; border:1px solid #8d7652; background:#2f2921; color:#f3e5cd; padding:9px 12px; border-radius:7px; font-weight:bold; text-decoration:none; }
.learn-button:hover { background:#43392c; }
.learn-page { max-width:1080px; margin:0 auto; padding:clamp(14px,3vw,30px); }
.learn-hero { display:flex; justify-content:space-between; gap:24px; align-items:flex-end; margin-bottom:20px; }
.learn-hero h1 { margin:4px 0 8px; font-family:Georgia,serif; font-size:clamp(2rem,5vw,3.4rem); font-weight:600; }
.learn-hero p { margin:0; max-width:760px; color:#51493e; line-height:1.6; }
.learn-back { text-decoration:none; white-space:nowrap; }
.lesson-progress { display:flex; justify-content:center; gap:8px; margin:20px 0; flex-wrap:wrap; }
.lesson-dot { width:38px; height:38px; border-radius:50%; border:1px solid #a4957e; background:#f7f2e9; color:#665a48; font-weight:bold; }
.lesson-dot.active { background:#3b3429; color:#fff3de; border-color:#3b3429; transform:scale(1.08); }
.lesson-dot.complete { background:#b59a6d; color:#201a13; border-color:#8e744d; }
.lesson-card { background:#faf7f0; border:1px solid #cfc5b4; border-radius:14px; padding:clamp(18px,4vw,34px); box-shadow:0 8px 22px #59483118; }
.lesson-heading { display:flex; justify-content:space-between; align-items:flex-start; gap:20px; padding-bottom:20px; border-bottom:1px solid #ddd3c4; }
.lesson-heading h2 { font-size:clamp(1.7rem,4vw,2.5rem); margin:4px 0 8px; }
.lesson-heading p { margin:0; line-height:1.6; color:#5d5345; max-width:760px; }
.lesson-number { font-size:.7rem; letter-spacing:.14em; text-transform:uppercase; color:#8a7047; font-weight:bold; }
.lesson-badge { border:1px solid #9b845f; border-radius:999px; padding:7px 11px; color:#6b5534; font-size:.68rem; font-weight:bold; letter-spacing:.1em; white-space:nowrap; }
.teaching-demo { margin:30px auto 20px; min-height:180px; max-width:760px; display:flex; align-items:center; justify-content:center; gap:20px; }
.demo-endpoint { width:112px; height:112px; border-radius:50%; background:#22201b; border:5px solid #8c806c; color:#f7eddb; display:flex; flex-direction:column; justify-content:center; text-align:center; box-shadow:0 8px 18px #0003; }
.demo-endpoint small { color:#aca18f; text-transform:uppercase; letter-spacing:.08em; font-size:.62rem; }
.demo-endpoint strong { font-family:Georgia,serif; font-size:2.8rem; line-height:1; }
.lamp-end { background:#efe2a4; color:#382c16; border-color:#bda158; box-shadow:0 0 25px #e9cb6c88; }
.electric-wire { height:5px; background:#ad8c54; width:min(46vw,370px); position:relative; box-shadow:0 0 8px #d0a75f88; }
.electric-wire span { position:absolute; left:50%; top:-27px; transform:translateX(-50%); white-space:nowrap; color:#786344; font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; }
.rotor-demo { gap:45px; }
.mini-rotor { min-width:145px; min-height:170px; background:linear-gradient(90deg,#aaa18e,#f0eadb 17%,#d2c9b5 50%,#918978); border:4px solid #2a251e; border-radius:10px; display:flex; flex-direction:column; align-items:center; justify-content:center; box-shadow:inset 0 0 15px #0004,0 8px 16px #0003; color:#1c1914; }
.mini-rotor span,.mini-rotor small { font-size:.65rem; letter-spacing:.12em; font-weight:bold; color:#5a5244; }
.mini-rotor strong { font-family:Georgia,serif; font-size:3.6rem; line-height:1.1; }
.mini-rotor.compact { min-width:110px; min-height:130px; }
.mini-rotor.compact strong { font-size:2rem; }
.demo-controls { display:flex; justify-content:center; flex-wrap:wrap; gap:9px; margin:14px 0 20px; align-items:center; }
.demo-message { font-family:"Courier New",monospace; background:#eee7db; padding:8px 12px; border-radius:6px; }
.explain-box { max-width:820px; margin:20px auto 0; background:#eee7db; border-left:5px solid #9b7a49; border-radius:7px; padding:15px 18px; color:#51483b; line-height:1.65; }
.explain-box h3 { margin:0 0 7px; color:#4b3e2c; }
.explain-box p { margin:7px 0; }
.explain-box.important { border-left-color:#574632; background:#e7dfd1; }
.stacked-rotors { margin:36px auto 28px; display:flex; align-items:center; justify-content:center; gap:12px; flex-wrap:wrap; }
.path-letter { width:66px; height:66px; border-radius:50%; display:grid; place-items:center; background:#29251f; color:#fff1db; font-family:Georgia,serif; font-size:2rem; font-weight:bold; }
.path-letter.accent { background:#af925e; color:#261f15; }
.path-arrow { color:#856d48; font-size:1.8rem; font-weight:bold; }
.reflector-demo { max-width:800px; margin:35px auto 25px; display:grid; grid-template-columns:1fr 170px; grid-template-rows:auto auto; gap:10px 20px; align-items:center; }
.reflector-block { grid-column:2; grid-row:1/3; background:#3c352b; color:#f4e8d3; border:4px solid #987b50; border-radius:50% 12px 12px 50%; min-height:150px; display:flex; flex-direction:column; justify-content:center; text-align:center; font-weight:bold; letter-spacing:.08em; }
.reflector-block small { font-weight:normal; letter-spacing:0; opacity:.75; margin-top:4px; }
.reflector-path { display:flex; align-items:center; justify-content:space-between; gap:7px; padding:13px; background:#eee7db; border-radius:7px; font-size:.78rem; }
.reflector-path b { color:#947744; }
.plugboard-demo { margin:35px auto 20px; max-width:720px; display:flex; align-items:center; justify-content:center; gap:0; }
.plug-socket { width:70px; height:70px; border-radius:50%; border:4px solid #aa956f; background:#171512; color:#f7ead4; display:grid; place-items:center; font-size:1.6rem; }
.plug-cable { width:180px; height:7px; background:#8b6844; box-shadow:0 2px 5px #0004; }
.plugboard-text { max-width:300px; margin-left:25px; line-height:1.5; color:#665746; }
.plugboard-mini-grid { max-width:700px; margin:0 auto; display:grid; grid-template-columns:repeat(13,1fr); gap:5px; background:#28231d; padding:12px; border-radius:8px; }
.plugboard-mini-grid span { aspect-ratio:1; border:1px solid #746552; border-radius:50%; color:#b9ab96; display:grid; place-items:center; font-size:.72rem; }
.plugboard-mini-grid span.paired { border-color:#d2b16f; background:#8c7144; color:#fff8e9; box-shadow:0 0 9px #e1bb6c66; }
.stepping-demo { margin:35px auto 20px; display:flex; justify-content:center; align-items:center; gap:35px; }
.stepping-readout { min-width:160px; background:#27231d; border:3px solid #8c795b; border-radius:8px; padding:15px; text-align:center; color:#f3e6d0; }
.stepping-readout small { display:block; text-transform:uppercase; letter-spacing:.1em; color:#aa9a83; font-size:.65rem; }
.stepping-readout strong { display:block; font-family:"Courier New",monospace; font-size:2rem; letter-spacing:.18em; margin-top:5px; }
.lamp-readout strong { color:#ffe292; text-shadow:0 0 9px #ffd056; }
.teaching-key { width:72px; max-width:none; }
.double-step-demo { max-width:850px; margin:30px auto 20px; border:1px solid #cabda9; border-radius:9px; overflow:hidden; }
.double-step-row { display:grid; grid-template-columns:90px 70px 80px 70px 1fr; align-items:center; gap:8px; padding:12px 14px; border-bottom:1px solid #ddd2c2; background:#f7f3eb; }
.double-step-row:last-child { border-bottom:0; }
.double-step-row.header { background:#3b342a; color:#eee3d0; text-transform:uppercase; letter-spacing:.06em; font-size:.67rem; }
.double-step-row b { display:grid; place-items:center; background:#e4dac9; border:1px solid #b8a88f; border-radius:5px; min-height:36px; font-family:Georgia,serif; font-size:1.3rem; }
.double-step-row.highlight { background:#f2e6ca; }
.double-step-row.highlight b:nth-child(3) { background:#caa962; color:#2c2110; }
.double-step-row.second b:nth-child(2),.double-step-row.second b:nth-child(3) { background:#caa962; color:#2c2110; }
.m4-lesson-demo { margin:35px auto 25px; display:flex; align-items:center; justify-content:center; gap:22px; flex-wrap:wrap; }
.m4-moving-bank { display:flex; gap:10px; }
.m4-rotor { min-width:105px; min-height:135px; border-radius:9px; border:3px solid #3a3328; background:linear-gradient(90deg,#aaa18e,#eee7d7,#a39a88); display:flex; flex-direction:column; justify-content:center; align-items:center; box-shadow:inset 0 0 12px #0003; }
.m4-rotor strong { font-family:Georgia,serif; font-size:2.2rem; }
.m4-rotor small,.m4-rotor span { font-size:.62rem; text-transform:uppercase; letter-spacing:.08em; color:#5f5648; }
.m4-rotor.stationary { border-color:#8b7049; background:linear-gradient(90deg,#927b5a,#eadbbf,#987f5b); }
.plus-sign { font-size:2rem; color:#826b48; }
.course-complete { max-width:820px; margin:22px auto 0; padding:18px; border-radius:9px; background:#322c23; color:#f3e8d5; display:flex; flex-wrap:wrap; align-items:center; gap:12px; }
.course-complete strong { font-family:Georgia,serif; font-size:1.2rem; }
.course-complete span { flex:1 1 300px; color:#c8baa4; }
.course-complete a { text-decoration:none; }
.lesson-nav { margin-top:30px; padding-top:20px; border-top:1px solid #ddd3c3; display:flex; justify-content:space-between; gap:10px; }
.lesson-nav button:disabled { opacity:.4; cursor:default; }
.why-panel { margin-top:18px; background:#2f2a22; color:#eee4d3; border-radius:12px; padding:22px; display:grid; grid-template-columns:280px 1fr; gap:25px; align-items:center; }
.why-panel h2 { margin:4px 0; }
.why-panel p { margin:0; color:#cfc3b0; line-height:1.65; }

@media (max-width: 800px) {
    .topbar-inner { align-items:flex-start; }
    .topbar .brand-block { flex-direction:column; gap:1px; }
    .learn-hero { flex-direction:column; align-items:flex-start; }
    .reflector-demo { grid-template-columns:1fr; grid-template-rows:auto; }
    .reflector-block { grid-column:1; grid-row:auto; border-radius:12px; min-height:100px; }
    .plugboard-demo { flex-wrap:wrap; }
    .plugboard-text { width:100%; max-width:520px; margin:15px 0 0; text-align:center; }
    .double-step-row { grid-template-columns:65px 45px 55px 45px 1fr; font-size:.82rem; padding:10px 8px; }
    .why-panel { grid-template-columns:1fr; gap:8px; }
}
@media (max-width: 560px) {
    .topbar-inner { flex-direction:column; gap:8px; }
    .main-nav { width:100%; }
    .main-nav a { flex:1; text-align:center; }
    .lesson-heading { flex-direction:column; }
    .teaching-demo { min-height:140px; gap:10px; }
    .demo-endpoint { width:80px; height:80px; border-width:3px; }
    .demo-endpoint strong { font-size:2rem; }
    .electric-wire { width:32vw; }
    .electric-wire span { display:none; }
    .rotor-demo { gap:10px; }
    .mini-rotor { min-width:110px; min-height:140px; }
    .mini-rotor strong { font-size:2.7rem; }
    .stacked-rotors .path-arrow { font-size:1rem; }
    .stacked-rotors .mini-rotor.compact { min-width:78px; min-height:105px; }
    .plugboard-mini-grid { grid-template-columns:repeat(9,1fr); }
    .stepping-demo { gap:10px; }
    .stepping-readout { min-width:100px; padding:10px 6px; }
    .stepping-readout strong { font-size:1.4rem; }
    .teaching-key { width:58px; }
    .double-step-demo { overflow-x:auto; }
    .double-step-row { min-width:620px; }
    .m4-moving-bank { gap:5px; }
    .m4-rotor { min-width:78px; min-height:110px; }
    .lesson-nav { flex-direction:column; }
    .lesson-nav .action { width:100%; }
}

/* Version 6: interactive signal laboratory */
.signal-lab { margin-top:18px; background:#f8f4ec; border:1px solid #cfc2ae; border-radius:12px; padding:clamp(18px,3vw,30px); box-shadow:0 8px 22px #59483118; }
.signal-lab-heading { display:flex; justify-content:space-between; gap:28px; align-items:flex-start; }
.signal-lab-heading h2 { margin:4px 0 8px; font-size:clamp(1.55rem,3vw,2.2rem); }
.signal-lab-heading p { margin:0; max-width:760px; color:#5d5345; line-height:1.6; }
.signal-lab-result { min-width:145px; padding:13px 16px; background:#2d2821; color:#f4e8d3; border:2px solid #92784e; border-radius:9px; text-align:center; }
.signal-lab-result small { display:block; color:#bbaa91; text-transform:uppercase; font-size:.62rem; letter-spacing:.12em; }
.signal-lab-result strong { display:block; margin-top:4px; font-family:Georgia,serif; font-size:1.65rem; color:#ffe292; }
.signal-letter-picker { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:24px 0 16px; }
.signal-letter-picker > span { margin-right:5px; font-weight:bold; color:#554a3b; }
.signal-choice { width:44px; height:44px; border-radius:50%; border:2px solid #9c8868; background:#eee6d8; color:#3c3328; font:700 1rem Georgia,serif; cursor:pointer; }
.signal-choice.selected { background:#3a3329; color:#ffe6a1; border-color:#c5a663; box-shadow:0 0 12px #c8a85f66; }
.signal-summary { display:flex; justify-content:center; flex-wrap:wrap; gap:8px; margin:16px 0; }
.signal-summary span { padding:7px 11px; border-radius:999px; background:#e9e0d1; color:#605342; font-size:.78rem; }
.signal-summary strong { font-family:"Courier New",monospace; letter-spacing:.12em; }
.signal-stage-list { display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:9px; margin:20px 0; }
.signal-stage { min-height:88px; border-radius:8px; border:1px solid #cfc3b1; background:#ece5da; padding:10px; display:flex; gap:9px; align-items:center; transition:opacity .15s ease, transform .15s ease, box-shadow .15s ease; }
.signal-stage.waiting { opacity:.36; }
.signal-stage.revealed { background:#f8f3e9; }
.signal-stage.current { border-color:#a27e45; box-shadow:0 0 0 2px #cbaa6b55,0 7px 14px #5a49321a; transform:translateY(-2px); }
.signal-stage-number { flex:0 0 29px; height:29px; border-radius:50%; display:grid; place-items:center; background:#40382d; color:#f7ead5; font-size:.72rem; }
.signal-stage small { display:block; color:#766a59; font-size:.67rem; line-height:1.25; }
.signal-stage strong { display:block; margin-top:3px; font-family:"Courier New",monospace; font-size:1.06rem; color:#3b3227; }
.signal-lab-controls { display:flex; justify-content:center; flex-wrap:wrap; gap:8px; margin:18px 0 4px; }
.signal-lab-controls button:disabled { opacity:.42; cursor:default; }
.reciprocal-demo { margin-top:24px; padding:18px; border-radius:9px; background:#332d25; color:#eee3d1; display:grid; grid-template-columns:1fr auto; gap:20px; align-items:center; }
.reciprocal-demo h3 { margin:4px 0 7px; }
.reciprocal-demo p { margin:0; color:#cfc1ad; line-height:1.55; }
.reciprocal-equation { padding:12px 15px; border:1px solid #a68a5d; border-radius:7px; background:#211e19; color:#ffe39b; white-space:nowrap; font:700 1.05rem "Courier New",monospace; }

@media (max-width: 700px) {
    .signal-lab-heading { flex-direction:column; }
    .signal-lab-result { width:100%; }
    .reciprocal-demo { grid-template-columns:1fr; }
    .reciprocal-equation { text-align:center; white-space:normal; }
}

/* Version 7: knowledge check and practical decoding challenge */
.challenge-page { max-width:1280px; margin:0 auto; padding:22px; }
.challenge-hero { display:flex; justify-content:space-between; align-items:flex-end; gap:28px; margin:10px 0 18px; }
.challenge-hero h1 { margin:5px 0 8px; font-family:Georgia,serif; font-size:clamp(2rem,5vw,3.6rem); color:#30291f; }
.challenge-hero p { max-width:760px; margin:0; color:#625747; line-height:1.65; }
.challenge-hero-actions { display:flex; flex-wrap:wrap; gap:8px; }
.score-strip { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin-bottom:18px; }
.score-strip > div { border:1px solid #c9bda9; border-radius:9px; background:#f7f2e9; padding:12px 16px; display:flex; justify-content:space-between; align-items:center; gap:12px; }
.score-strip small { text-transform:uppercase; letter-spacing:.08em; color:#766853; font-size:.65rem; }
.score-strip strong { font-family:"Courier New",monospace; color:#332b21; }
.challenge-grid { display:grid; grid-template-columns:minmax(0,1.2fr) minmax(330px,.8fr); gap:18px; align-items:start; }
.quiz-panel,.mission-panel { background:#faf7f0; border:1px solid #cfc5b4; border-radius:12px; padding:20px; box-shadow:0 6px 18px #59483114; }
.challenge-heading { margin-bottom:12px; }
.quiz-card { position:relative; display:grid; grid-template-columns:46px 1fr; gap:13px; padding:17px 0; border-top:1px solid #ddd3c3; }
.quiz-card:first-of-type { border-top:0; }
.quiz-number { width:38px; height:38px; border-radius:50%; background:#3b342a; color:#f6ead7; display:grid; place-items:center; font-weight:bold; }
.quiz-card.correct .quiz-number { background:#476443; }
.quiz-card.incorrect .quiz-number { background:#87544a; }
.quiz-content h3 { margin:1px 0 12px; font-size:1rem; text-transform:none; letter-spacing:0; color:#40362a; }
.quiz-options { display:grid; gap:7px; }
.quiz-option { width:100%; min-height:44px; border:1px solid #c2b49f; border-radius:7px; background:#f3ede2; color:#473d31; padding:8px 10px; display:flex; align-items:center; text-align:left; gap:9px; }
.quiz-option span { flex:0 0 27px; height:27px; border-radius:50%; background:#d9cebc; display:grid; place-items:center; font-weight:bold; font-size:.74rem; }
.quiz-option:not(:disabled):hover { border-color:#9f8254; background:#fff9ee; }
.quiz-option.selected { border-color:#957448; background:#eee2ca; }
.quiz-option:disabled { opacity:.72; cursor:default; }
.quiz-feedback { margin-top:10px; border-radius:6px; padding:9px 11px; font-size:.82rem; line-height:1.5; }
.quiz-feedback.good { background:#e2eddf; color:#385136; border-left:4px solid #587a52; }
.quiz-feedback.bad { background:#f2e1dc; color:#673d35; border-left:4px solid #9a5b4e; }
.mission-panel { position:sticky; top:86px; }
.mission-panel > h2 { margin:4px 0 7px; }
.mission-panel > p { color:#655a4a; line-height:1.55; }
.mission-card { margin:18px 0 14px; background:#e8dfce; border:1px solid #bcae97; border-radius:8px; overflow:hidden; box-shadow:inset 0 0 22px #8b75531c; }
.mission-title { background:#3a3329; color:#f1e5d1; padding:8px 12px; text-align:center; font:bold .72rem "Courier New",monospace; letter-spacing:.15em; }
.mission-card dl { margin:0; padding:11px 14px; }
.mission-card dl div { display:flex; justify-content:space-between; gap:15px; border-bottom:1px dashed #b9a98f; padding:5px 0; }
.mission-card dl div:last-child { border-bottom:0; }
.mission-card dt { color:#73644f; font-size:.72rem; text-transform:uppercase; }
.mission-card dd { margin:0; font:700 .82rem "Courier New",monospace; color:#332b21; }
.cipher-slip { margin:0 14px 14px; border:1px solid #aa987d; background:#f8f0df; padding:10px; text-align:center; }
.cipher-slip small { display:block; text-transform:uppercase; letter-spacing:.12em; color:#75654d; font-size:.62rem; }
.cipher-slip strong { display:block; margin-top:4px; font:700 1.45rem "Courier New",monospace; letter-spacing:.24em; color:#2f281f; }
.mission-instruction { padding:10px 12px; background:#f2eadc; border-radius:7px; color:#5d5141; line-height:1.55; font-size:.86rem; }
.challenge-machine { margin-top:14px; border:4px solid #4d4335; border-radius:10px; background:#26221c; padding:14px; box-shadow:inset 0 0 22px #0008; color:#ede1cd; }
.challenge-rotors { display:grid; grid-template-columns:repeat(3,1fr); gap:6px; text-align:center; }
.challenge-rotors span { padding:5px; background:#8f8572; color:#28231d; border:1px solid #c2b7a5; border-radius:4px; font:bold .72rem Georgia,serif; }
.challenge-rotors strong { grid-column:1/-1; background:#0f0e0c; border:1px solid #6d604c; color:#f1dfb5; padding:7px; font:700 1.25rem "Courier New",monospace; letter-spacing:.4em; }
.challenge-tapes { display:grid; grid-template-columns:1fr 1fr; gap:7px; margin:10px 0; }
.challenge-tapes > div { background:#15130f; border:1px solid #665a49; padding:8px; min-height:55px; }
.challenge-tapes small { display:block; color:#998b74; text-transform:uppercase; font-size:.59rem; letter-spacing:.1em; }
.challenge-tapes strong { display:block; margin-top:4px; font:700 .95rem "Courier New",monospace; letter-spacing:.09em; word-break:break-all; }
.challenge-tapes strong.decoded { color:#ffe18b; }
.challenge-keyboard { padding:6px 0 10px; }
.challenge-key-row { display:flex; justify-content:center; gap:4px; margin:4px 0; }
.challenge-key { width:31px; height:31px; border-radius:50%; border:2px solid #988a74; background:#171511; color:#eee1cc; font:bold .7rem Georgia,serif; box-shadow:0 2px 0 #080705; }
.challenge-key:active { transform:translateY(2px); box-shadow:none; }
.mission-actions { display:flex; gap:7px; flex-wrap:wrap; }
.mission-actions .action { flex:1 1 130px; }
.mission-result { margin-top:10px; border-radius:6px; padding:10px; font-size:.82rem; line-height:1.5; }
.mission-result.success { background:#253723; border:1px solid #66815e; color:#e1f1dc; }
.mission-result.try-again { background:#4a302a; border:1px solid #8c5e52; color:#f3dcd5; }
.challenge-complete { margin-top:18px; padding:20px; border-radius:12px; background:#302a22; color:#eee2cf; display:grid; grid-template-columns:auto 1fr auto; gap:18px; align-items:center; border:1px solid #8e7751; }
.challenge-complete h2 { margin:4px 0; color:#ffe7ae; }
.challenge-complete p { margin:0; color:#cdbfa9; }
.challenge-seal { width:62px; height:62px; border-radius:50%; display:grid; place-items:center; background:#617655; border:3px solid #a7b59a; color:#fff; font-size:2rem; font-weight:bold; }

@media (max-width: 900px) {
    .challenge-grid { grid-template-columns:1fr; }
    .mission-panel { position:static; }
}
@media (max-width: 650px) {
    .challenge-page { padding:12px; }
    .challenge-hero { flex-direction:column; align-items:flex-start; }
    .score-strip { grid-template-columns:1fr; }
    .score-strip > div { padding:9px 12px; }
    .quiz-panel,.mission-panel { padding:14px; }
    .quiz-card { grid-template-columns:36px 1fr; gap:8px; }
    .quiz-number { width:31px; height:31px; }
    .challenge-complete { grid-template-columns:auto 1fr; }
    .challenge-complete .action { grid-column:1/-1; text-align:center; }
}

/* Version 8: progressive radio-operator missions */
.missions-page { max-width:1280px; margin:0 auto; padding:22px; }
.missions-hero { display:flex; justify-content:space-between; align-items:flex-end; gap:28px; margin:10px 0 18px; }
.missions-hero h1 { margin:5px 0 8px; font-family:Georgia,serif; font-size:clamp(2rem,5vw,3.6rem); color:#30291f; }
.missions-hero p { max-width:760px; margin:0; color:#625747; line-height:1.65; }
.missions-hero-actions { display:flex; flex-wrap:wrap; gap:8px; }
.mission-progress { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin:18px 0; }
.mission-tab { border:1px solid #bcae98; border-radius:10px; background:#eee7da; padding:11px 13px; display:flex; align-items:center; gap:10px; text-align:left; color:#443a2e; cursor:pointer; }
.mission-tab > span { width:34px; height:34px; flex:0 0 34px; border-radius:50%; display:grid; place-items:center; background:#55493a; color:#f3e5cf; font-weight:bold; }
.mission-tab div { display:flex; flex-direction:column; min-width:0; }
.mission-tab strong { font-size:.85rem; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.mission-tab small { color:#766a58; font-size:.68rem; margin-top:2px; }
.mission-tab.active { border-color:#80663f; background:#f8efd9; box-shadow:0 0 0 2px #aa8b5860; }
.mission-tab.complete > span { background:#58704f; }
.mission-tab:disabled { opacity:.48; cursor:default; }
.mission-workspace { display:grid; grid-template-columns:minmax(330px,.78fr) minmax(0,1.22fr); gap:18px; align-items:start; }
.key-sheet { background:#e9dfcc; border:1px solid #b8a88d; border-radius:8px; box-shadow:0 8px 20px #4c3c251e; overflow:hidden; }
.paper-heading { background:#383127; color:#efe2cd; padding:10px 14px; display:flex; justify-content:space-between; gap:12px; font:.72rem "Courier New",monospace; letter-spacing:.1em; }
.paper-heading strong { color:#ffe19b; }
.mission-brief { padding:18px 18px 8px; }
.mission-brief h2 { margin:4px 0 8px; font-family:Georgia,serif; color:#392f25; }
.mission-brief p { margin:0; color:#675945; line-height:1.55; }
.key-grid { margin:8px 18px 14px; padding:0; }
.key-grid div { display:grid; grid-template-columns:105px 1fr; gap:10px; padding:7px 0; border-bottom:1px dashed #b8a88e; }
.key-grid dt { font-size:.67rem; text-transform:uppercase; letter-spacing:.08em; color:#796a53; }
.key-grid dd { margin:0; text-align:right; font:700 .78rem "Courier New",monospace; color:#332b22; word-break:break-word; }
.intercept-paper { margin:0 18px 14px; padding:14px; border:1px solid #aa987b; background:#fbf3df; text-align:center; }
.intercept-paper small { display:block; font-size:.63rem; letter-spacing:.13em; color:#76664e; }
.intercept-paper strong { display:block; margin-top:7px; font:700 clamp(1.05rem,3vw,1.55rem) "Courier New",monospace; letter-spacing:.2em; color:#29231c; overflow-wrap:anywhere; }
.operator-note { margin:0 18px 18px; border-left:4px solid #856943; background:#ddd0b9; padding:10px 12px; display:flex; flex-direction:column; gap:3px; color:#594a37; font-size:.78rem; line-height:1.45; }
.field-machine { border:5px solid #493f32; border-radius:12px; background:linear-gradient(#2c271f,#1e1b16); color:#eee1ce; padding:18px; box-shadow:inset 0 0 32px #0009,0 8px 20px #4b3b2522; }
.field-machine-top { display:flex; justify-content:space-between; align-items:flex-start; gap:15px; }
.field-machine-top h2 { margin:4px 0 0; color:#f3e5cf; font-family:Georgia,serif; }
.mission-difficulty { border:1px solid #8e795b; border-radius:999px; padding:6px 10px; color:#d8c5a9; font-size:.7rem; }
.field-rotors { margin:18px auto 12px; display:grid; grid-template-columns:repeat(3,1fr); gap:8px; max-width:620px; }
.field-rotors.four { grid-template-columns:repeat(4,1fr); }
.field-rotors > div { background:linear-gradient(90deg,#817966,#d6ceba,#847b68); color:#29241d; border:2px solid #b1a48e; border-radius:6px; padding:7px; text-align:center; }
.field-rotors small { display:block; color:#5f574a; text-transform:uppercase; font-size:.56rem; letter-spacing:.09em; }
.field-rotors span { display:block; margin-top:2px; font:700 .82rem Georgia,serif; }
.field-rotors > strong { grid-column:1/-1; background:#0e0d0b; border:1px solid #6e604b; color:#ffe1a0; padding:8px; text-align:center; font:700 1.45rem "Courier New",monospace; letter-spacing:.42em; }
.field-tapes { display:grid; grid-template-columns:1fr 1fr; gap:9px; margin:12px 0; }
.field-tapes > div { min-height:72px; background:#12100d; border:1px solid #665a48; padding:10px; }
.field-tapes small { display:block; color:#91836f; text-transform:uppercase; letter-spacing:.09em; font-size:.58rem; }
.field-tapes strong { display:block; margin-top:5px; font:700 1rem "Courier New",monospace; letter-spacing:.08em; overflow-wrap:anywhere; }
.field-tapes .plain-tape { color:#ffe28d; }
.field-lamp { width:86px; height:86px; margin:15px auto 10px; border-radius:50%; border:5px solid #544936; background:#17140f; display:flex; flex-direction:column; align-items:center; justify-content:center; box-shadow:inset 0 0 16px #000; }
.field-lamp small { text-transform:uppercase; color:#7e705b; font-size:.52rem; }
.field-lamp strong { font:700 2.2rem Georgia,serif; color:#ffe59b; text-shadow:0 0 12px #ffd55d; }
.mission-keyboard { margin-top:8px; }
.mission-keyboard .challenge-key { width:40px; height:40px; font-size:.78rem; }
.mission-entry-status { display:grid; grid-template-columns:auto 1fr; gap:12px; align-items:center; margin:12px 0; color:#b9aa94; font-size:.68rem; }
.mission-entry-status > div { height:7px; border-radius:999px; background:#0e0d0b; overflow:hidden; border:1px solid #574c3c; }
.mission-entry-status i { display:block; height:100%; background:#b39155; transition:width .15s ease; }
.mission-graduation { margin-top:18px; padding:20px; border-radius:12px; background:#302a22; color:#eee2cf; display:grid; grid-template-columns:auto 1fr auto; gap:18px; align-items:center; border:1px solid #8e7751; }
.mission-graduation h2 { margin:4px 0; color:#ffe7ae; }
.mission-graduation p { margin:0; color:#cdbfa9; }
.mission-seal { width:64px; height:64px; border-radius:50%; display:grid; place-items:center; background:#806840; border:3px solid #c3a875; color:#fff4d8; font-size:2rem; }

@media (max-width: 900px) {
    .mission-workspace { grid-template-columns:1fr; }
    .mission-progress { grid-template-columns:1fr; }
}
@media (max-width: 650px) {
    .missions-page { padding:12px; }
    .missions-hero { flex-direction:column; align-items:flex-start; }
    .field-machine { padding:12px; }
    .field-tapes { grid-template-columns:1fr; }
    .mission-keyboard .challenge-key { width:32px; height:32px; }
    .field-rotors > strong { letter-spacing:.25em; }
    .mission-graduation { grid-template-columns:auto 1fr; }
    .mission-graduation .action { grid-column:1/-1; text-align:center; }
}


/* Version 9: message exchange */
.exchange-page { max-width:1280px; margin:0 auto; padding:22px; }
.exchange-hero { display:flex; justify-content:space-between; align-items:flex-end; gap:28px; margin:10px 0 16px; }
.exchange-hero h1 { margin:5px 0 8px; font-family:Georgia,serif; font-size:clamp(2rem,5vw,3.6rem); color:#30291f; }
.exchange-hero p { max-width:760px; margin:0; color:#625747; line-height:1.65; }
.exchange-hero-actions { display:flex; gap:8px; flex-wrap:wrap; }
.exchange-note { display:flex; gap:14px; align-items:center; padding:11px 14px; border:1px solid #bcae98; background:#eee7da; border-radius:9px; color:#5e5242; margin-bottom:16px; }
.exchange-note strong { white-space:nowrap; color:#3d3429; }
.exchange-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; align-items:start; }
.exchange-card { background:#f2eadc; border:1px solid #b9aa92; border-radius:11px; padding:18px; box-shadow:0 7px 18px #4c3c2518; }
.exchange-card-heading h2 { margin:4px 0 7px; font-family:Georgia,serif; color:#3a3025; }
.exchange-help { color:#665946; line-height:1.55; font-size:.9rem; }
.exchange-settings { margin:14px 0; padding:0; border-top:1px dashed #b7a78d; }
.exchange-settings div { display:grid; grid-template-columns:105px 1fr; gap:10px; padding:7px 0; border-bottom:1px dashed #b7a78d; }
.exchange-settings dt { font-size:.66rem; text-transform:uppercase; letter-spacing:.08em; color:#796a53; }
.exchange-settings dd { margin:0; text-align:right; font:700 .78rem "Courier New",monospace; color:#332b22; overflow-wrap:anywhere; }
.exchange-label { display:block; margin:12px 0 5px; color:#5b4e3d; font-size:.7rem; font-weight:bold; text-transform:uppercase; letter-spacing:.08em; }
.exchange-input,.exchange-code { width:100%; box-sizing:border-box; border:1px solid #aa9b83; border-radius:6px; background:#fffaf0; color:#30291f; padding:9px 10px; font-family:"Courier New",monospace; }
.exchange-code { resize:vertical; line-height:1.45; overflow-wrap:anywhere; }
.exchange-cipher { min-height:54px; padding:11px; border:1px solid #aa987b; background:#fbf3df; color:#29231c; font:700 1rem "Courier New",monospace; letter-spacing:.13em; overflow-wrap:anywhere; }
.exchange-actions { display:flex; gap:8px; flex-wrap:wrap; margin-top:12px; }
.exchange-actions .action { flex:1 1 150px; }
.transmission-sheet { margin-top:16px; border:2px solid #665744; background:#fbf3df; color:#2f281f; box-shadow:3px 4px 0 #8f7c6050; }
.transmission-sheet-head { display:flex; justify-content:space-between; gap:12px; padding:8px 10px; background:#3b3329; color:#efe2cd; font:.7rem "Courier New",monospace; }
.transmission-sheet-head strong { color:#ffe19b; }
.transmission-meta { display:flex; flex-wrap:wrap; gap:8px 16px; padding:9px 11px; border-bottom:1px dashed #aa987b; font:.7rem "Courier New",monospace; }
.transmission-sheet > small { display:block; padding:9px 11px 0; color:#77664d; letter-spacing:.12em; }
.transmission-cipher { display:block; padding:6px 11px 13px; font:700 1.25rem "Courier New",monospace; letter-spacing:.18em; overflow-wrap:anywhere; }
.exchange-tip { color:#776a58; font-size:.76rem; line-height:1.5; margin:7px 0 0; }
.exchange-result { margin-top:12px; border-radius:6px; padding:10px; font-size:.82rem; }
.exchange-result.error { background:#f0dcd7; border:1px solid #b8897e; color:#6d332a; }
.received-banner { margin-top:16px; padding:10px 12px; border-left:4px solid #5d7755; background:#dfe8d9; display:flex; justify-content:space-between; gap:12px; color:#40503b; }
.received-banner span { font-size:.72rem; text-transform:uppercase; }
.received-banner strong { font-family:"Courier New",monospace; }
.received-intercept { margin:12px 0; padding:14px; border:1px solid #aa987b; background:#fbf3df; text-align:center; }
.received-intercept small { display:block; font-size:.62rem; letter-spacing:.12em; color:#75654d; }
.received-intercept strong { display:block; margin-top:6px; font:700 1.25rem "Courier New",monospace; letter-spacing:.17em; overflow-wrap:anywhere; }
.action.wide { width:100%; }
.exchange-future { margin-top:18px; padding:18px; border-radius:11px; background:#302a22; color:#eee2cf; display:grid; grid-template-columns:auto 1fr; gap:18px; align-items:center; border:1px solid #8e7751; }
.exchange-future h2 { margin:4px 0; color:#ffe7ae; }
.exchange-future p { margin:0; color:#cdbfa9; line-height:1.55; }
.future-qr { width:70px; height:70px; display:grid; place-items:center; background:#f3ead8; color:#29231d; border:4px solid #9b8764; font-size:3rem; line-height:1; }

@media (max-width: 900px) {
    .exchange-grid { grid-template-columns:1fr; }
}
@media (max-width: 650px) {
    .exchange-page { padding:12px; }
    .exchange-hero { flex-direction:column; align-items:flex-start; }
    .exchange-note { flex-direction:column; align-items:flex-start; }
    .exchange-card { padding:14px; }
    .exchange-settings div { grid-template-columns:85px 1fr; }
    .transmission-sheet-head { flex-direction:column; gap:3px; }
}


/* Version 10: QR transmission */
.qr-panel { margin-top:14px; padding:13px; border:1px solid #a99573; border-radius:8px; background:#e8dfcf; }
.qr-panel-head { display:flex; justify-content:space-between; gap:12px; align-items:center; }
.qr-panel-head h3 { margin:3px 0 0; color:#3c3227; font-family:Georgia,serif; }
.qr-output { margin-top:13px; display:grid; grid-template-columns:auto 1fr; gap:18px; align-items:center; padding:14px; background:#fffaf0; border:1px solid #b4a487; border-radius:7px; }
.qr-canvas { width:276px; height:276px; display:grid; place-items:center; padding:10px; box-sizing:border-box; background:white; border:1px solid #d0c4b0; }
.qr-canvas svg { display:block; width:256px !important; height:256px !important; max-width:100%; }
.qr-instructions { display:flex; flex-direction:column; align-items:flex-start; gap:8px; color:#5c503f; line-height:1.5; }
.qr-instructions strong { color:#30281f; font-family:Georgia,serif; font-size:1.15rem; }
.qr-instructions span { font-size:.82rem; }
.qr-local { color:#58704e; font-weight:bold; }
@media (max-width:650px) {
    .qr-panel-head { align-items:flex-start; flex-direction:column; }
    .qr-output { grid-template-columns:1fr; justify-items:center; text-align:center; }
    .qr-canvas { width:min(276px,100%); height:auto; aspect-ratio:1; }
    .qr-instructions { align-items:center; }
}


/* Version 11: direct QR receive */
.exchange-result.warning { background:#f5e8c8; border:1px solid #c5a55d; color:#6d5420; }
.receive-page { max-width:900px; margin:0 auto; padding:24px; }
.receive-hero { display:grid; grid-template-columns:auto 1fr; gap:18px; align-items:center; margin:10px 0 18px; }
.receive-hero h1 { margin:4px 0 7px; font-family:Georgia,serif; color:#332b22; font-size:clamp(2rem,5vw,3.2rem); }
.receive-hero p { margin:0; color:#675a48; line-height:1.55; }
.receive-radio-badge { width:74px; height:74px; display:grid; place-items:center; border-radius:50%; background:#3a332a; border:4px double #ac946a; color:#f8df9f; font:700 1.55rem "Courier New",monospace; box-shadow:0 5px 14px #362a1c30; }
.receive-card { background:#f2eadc; border:1px solid #b9aa92; border-radius:11px; padding:20px; box-shadow:0 7px 18px #4c3c2518; }
.receive-error { border-color:#b8897e; background:#f0e2dc; }
.receive-banner-large { margin-top:0; padding:13px 14px; }
.receive-intro { display:grid; grid-template-columns:auto 1fr; gap:12px; align-items:start; margin:20px 0 8px; }
.receive-intro h2 { margin:1px 0 3px; font-family:Georgia,serif; color:#3c3227; font-size:1.2rem; }
.receive-intro p { margin:0; color:#70624f; font-size:.84rem; line-height:1.5; }
.receive-step { width:30px; height:30px; display:grid; place-items:center; border-radius:50%; background:#4f6048; color:#fff9e9; font:bold .85rem "Courier New",monospace; }
.receive-intercept-large { padding:18px; }
.receive-intercept-large strong { font-size:clamp(1rem,4vw,1.5rem); line-height:1.65; }
.receive-load { width:100%; margin-top:7px; font-size:1rem; padding:12px 16px; }
.receive-technical { margin-top:16px; border-top:1px dashed #b4a68f; padding-top:12px; color:#756650; }
.receive-technical summary { cursor:pointer; font-size:.75rem; font-weight:bold; text-transform:uppercase; letter-spacing:.06em; margin-bottom:8px; }
@media (max-width:650px) {
    .receive-page { padding:12px; }
    .receive-hero { grid-template-columns:1fr; }
    .receive-radio-badge { width:58px; height:58px; font-size:1.2rem; }
    .receive-card { padding:14px; }
}


/* Version 12: exhibit / classroom polish */
.brand-link { color:inherit; text-decoration:none; }
.brand-link:hover strong { color:#f5e4bd; }

.welcome-page {
    max-width:1180px;
    margin:0 auto;
    padding:clamp(16px,3vw,34px);
}
.welcome-hero {
    min-height:520px;
    display:grid;
    grid-template-columns:minmax(0,1.08fr) minmax(360px,.92fr);
    gap:clamp(28px,5vw,64px);
    align-items:center;
    padding:clamp(22px,5vw,60px) 0;
}
.welcome-copy h1 {
    margin:8px 0 16px;
    max-width:720px;
    font:600 clamp(2.7rem,6.5vw,5.4rem)/.98 Georgia,serif;
    letter-spacing:-.035em;
    color:#2c261f;
}
.welcome-lead {
    max-width:690px;
    margin:0;
    color:#5b5144;
    font-size:clamp(1rem,2vw,1.18rem);
    line-height:1.68;
}
.welcome-actions {
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top:25px;
}
.welcome-primary,.welcome-secondary {
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:11px 17px;
    border-radius:8px;
    font-weight:bold;
    text-decoration:none;
    border:1px solid #4b4032;
}
.welcome-primary {
    background:#373027;
    color:#fff4df;
    box-shadow:0 5px 14px #2d24182b;
}
.welcome-primary:hover { background:#4b4032; }
.welcome-secondary {
    background:#f5efe4;
    color:#3c3328;
    border-color:#aa987d;
}
.welcome-secondary:hover { background:#fffaf1; }
.welcome-audience {
    display:flex;
    flex-wrap:wrap;
    gap:7px;
    margin-top:20px;
}
.welcome-audience span {
    padding:6px 9px;
    border:1px solid #c9bba6;
    border-radius:999px;
    color:#766753;
    background:#f7f2e9aa;
    font-size:.73rem;
}
.welcome-machine {
    position:relative;
    padding:24px 24px 30px;
    border:9px solid #65462d;
    border-radius:18px;
    background:linear-gradient(145deg,#3a3025,#1e1914);
    box-shadow:0 22px 45px #30231540,inset 0 0 0 2px #a47a4c;
    transform:rotate(1deg);
}
.welcome-plaque {
    text-align:center;
    color:#d2bc8b;
    font:700 1rem Georgia,serif;
    letter-spacing:.28em;
    padding-bottom:14px;
    border-bottom:1px solid #6e5d45;
}
.welcome-rotors {
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:12px;
    max-width:340px;
    margin:23px auto;
}
.welcome-rotors div {
    text-align:center;
    border:2px solid #1b1712;
    border-radius:7px;
    overflow:hidden;
    background:linear-gradient(90deg,#aaa18d,#eee7d6,#9f9682);
    box-shadow:inset 0 0 8px #0005;
}
.welcome-rotors small {
    display:block;
    padding:5px 3px 3px;
    font-size:.54rem;
    letter-spacing:.12em;
    color:#5e5547;
}
.welcome-rotors strong {
    display:block;
    padding:4px 0 8px;
    font:700 2.2rem Georgia,serif;
    color:#1b1814;
}
.welcome-lamps,.welcome-keyboard {
    display:flex;
    justify-content:center;
    gap:8px;
    margin-top:13px;
}
.welcome-lamps span,.welcome-keyboard span {
    width:39px;
    height:39px;
    display:grid;
    place-items:center;
    border-radius:50%;
    font-family:Georgia,serif;
    font-weight:bold;
}
.welcome-lamps span {
    background:#141310;
    border:2px solid #5d5447;
    color:#817a6f;
    box-shadow:inset 0 0 6px #000;
}
.welcome-lamps span.lit {
    background:#ffe89d;
    color:#342a16;
    border-color:#e3c460;
    box-shadow:0 0 18px #eecb5eaa;
}
.welcome-keyboard span {
    width:31px;
    height:31px;
    background:#171512;
    border:2px solid #9c9383;
    color:#eee6d7;
    font-size:.72rem;
    box-shadow:0 3px 0 #080706;
}

.journey-section { padding:30px 0 18px; }
.journey-heading { max-width:760px; margin-bottom:20px; }
.journey-heading h2,.festival-section h2 {
    margin:5px 0 7px;
    font-size:clamp(1.8rem,4vw,2.7rem);
}
.journey-heading p { margin:0; color:#675b4b; line-height:1.55; }
.journey-grid {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:13px;
}
.journey-card {
    position:relative;
    min-height:295px;
    display:flex;
    flex-direction:column;
    padding:19px;
    color:#3c3328;
    text-decoration:none;
    background:#faf7f0;
    border:1px solid #cfc3b0;
    border-radius:13px;
    box-shadow:0 6px 18px #59483112;
    transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.journey-card:hover {
    transform:translateY(-4px);
    border-color:#9f8762;
    box-shadow:0 12px 26px #59483122;
}
.journey-number {
    color:#9c835b;
    font:bold .7rem "Courier New",monospace;
    letter-spacing:.12em;
}
.journey-icon {
    width:48px;
    height:48px;
    display:grid;
    place-items:center;
    margin:18px 0 3px;
    border-radius:50%;
    background:#393229;
    color:#f8e7bd;
    border:3px double #a98b5e;
    font:bold 1rem Georgia,serif;
}
.journey-card h3 {
    margin:10px 0 5px;
    color:#382f25;
    font:600 1.35rem Georgia,serif;
    text-transform:none;
    letter-spacing:0;
}
.journey-card p {
    flex:1;
    margin:0;
    color:#6a5f50;
    line-height:1.55;
    font-size:.88rem;
}
.journey-card strong {
    display:block;
    margin-top:15px;
    color:#6c5533;
    font-size:.8rem;
}

.festival-section {
    display:grid;
    grid-template-columns:1fr auto;
    gap:28px;
    align-items:center;
    margin:35px 0 20px;
    padding:clamp(22px,4vw,36px);
    border-radius:15px;
    background:linear-gradient(135deg,#2d2923,#433727);
    color:#f7eddc;
    border:1px solid #68553c;
    box-shadow:0 10px 28px #30231528;
}
.festival-section .eyebrow { color:#ceb27d; }
.festival-section h2 { color:#fff3dc; }
.festival-section p {
    max-width:760px;
    margin:0;
    color:#d8cdbb;
    line-height:1.6;
}
.festival-flow {
    display:flex;
    flex-wrap:wrap;
    gap:8px;
    align-items:center;
    margin-top:17px;
}
.festival-flow span {
    display:inline-flex;
    align-items:center;
    gap:7px;
    font-size:.77rem;
}
.festival-flow b {
    width:25px;
    height:25px;
    display:grid;
    place-items:center;
    border-radius:50%;
    background:#b49358;
    color:#211a12;
}
.festival-flow i { color:#a89270; font-style:normal; }
.festival-button {
    white-space:nowrap;
    background:#c2a365;
    color:#241c12;
    border-color:#e0c990;
}
.festival-button:hover { background:#d3b77b; }

.history-strip {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:1px;
    margin:28px 0 12px;
    overflow:hidden;
    border:1px solid #c9bca8;
    border-radius:10px;
    background:#c9bca8;
}
.history-strip div {
    background:#eee7db;
    padding:16px;
}
.history-strip strong {
    display:block;
    margin-bottom:4px;
    font:600 1.15rem Georgia,serif;
    color:#3a3127;
}
.history-strip span {
    display:block;
    color:#746654;
    line-height:1.4;
    font-size:.76rem;
}

@media (max-width:900px) {
    .welcome-hero {
        min-height:0;
        grid-template-columns:1fr;
        padding-top:32px;
    }
    .welcome-machine {
        max-width:560px;
        width:100%;
        margin:0 auto;
        transform:none;
    }
    .journey-grid { grid-template-columns:repeat(2,1fr); }
    .festival-section { grid-template-columns:1fr; }
    .festival-button { justify-self:start; }
    .history-strip { grid-template-columns:repeat(2,1fr); }
}

@media (max-width:620px) {
    .welcome-page { padding:12px; }
    .welcome-copy h1 { font-size:clamp(2.55rem,14vw,4rem); }
    .welcome-actions { flex-direction:column; }
    .welcome-primary,.welcome-secondary { width:100%; }
    .welcome-machine { padding:18px 10px 22px; border-width:6px; }
    .welcome-lamps { gap:5px; }
    .welcome-lamps span { width:34px; height:34px; }
    .welcome-keyboard { gap:3px; }
    .welcome-keyboard span { width:28px; height:28px; font-size:.65rem; }
    .journey-grid { grid-template-columns:1fr; }
    .journey-card { min-height:0; }
    .festival-flow i { display:none; }
    .festival-flow { align-items:flex-start; flex-direction:column; }
    .history-strip { grid-template-columns:1fr; }

    .topbar { padding:10px 12px; }
    .topbar-inner { gap:7px; }
    .topbar .brand-block { width:100%; justify-content:space-between; }
    .main-nav {
        overflow-x:auto;
        padding-bottom:3px;
        justify-content:flex-start;
        scrollbar-width:thin;
    }
    .main-nav a {
        flex:0 0 auto;
        white-space:nowrap;
        padding:7px 10px;
    }
}


/* Version 13: standalone WebAssembly host */
.wasm-loading {
    min-height:100vh;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:10px;
    padding:24px;
    text-align:center;
    background:#eee7db;
    color:#4c4032;
}
.wasm-loading-badge {
    width:105px;
    height:105px;
    display:grid;
    place-items:center;
    margin-bottom:8px;
    border-radius:50%;
    background:#352e26;
    border:5px double #a88d62;
    color:#f5dfaa;
    font:700 1rem Georgia,serif;
    letter-spacing:.12em;
    box-shadow:0 10px 28px #3528182a;
}
.wasm-loading strong {
    font:600 1.45rem Georgia,serif;
}
.wasm-loading span {
    color:#776954;
    font-size:.85rem;
}
#blazor-error-ui {
    display:none;
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:10000;
    padding:10px 16px;
    background:#6f302b;
    color:white;
    box-shadow:0 -2px 10px #0004;
}
#blazor-error-ui .reload,
#blazor-error-ui .dismiss {
    color:white;
    font-weight:bold;
    margin-left:12px;
}


/* ==========================================================
   v14 Radio Room
   ========================================================== */
.radio-page{max-width:1320px;margin:0 auto;padding:34px 24px 70px;color:#312b24}.radio-hero{display:flex;justify-content:space-between;gap:32px;align-items:flex-end;padding:30px 34px;background:linear-gradient(135deg,#312d27,#514b40);color:#f6eedf;border-radius:18px;box-shadow:0 18px 42px #2d241a26}.radio-hero h1{margin:.2rem 0 .55rem;font:700 clamp(2rem,4vw,3.5rem) Georgia,serif}.radio-hero p{max-width:760px;margin:0;color:#ded2bf;font-size:1.05rem;line-height:1.6}.radio-flow{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}.radio-flow span{border:1px solid #b8a57e;border-radius:999px;padding:7px 9px;font-size:.7rem;font-weight:800;letter-spacing:.08em;background:#211f1b}.radio-flow b{color:#d6bc84}.radio-explainer{display:flex;gap:18px;align-items:center;margin:18px 0 24px;padding:14px 18px;border-left:5px solid #987c4e;background:#f2eadc;border-radius:6px 12px 12px 6px}.radio-explainer span{color:#665b4b}.radio-console-grid,.radio-operator-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:22px}.radio-console{background:#222521;color:#ece6d6;border:7px solid #504737;border-radius:18px;padding:22px;box-shadow:inset 0 0 0 2px #796a52,0 12px 28px #271f1720}.radio-console-head{display:flex;align-items:center;gap:10px;justify-content:space-between;border-bottom:1px solid #66604f;padding-bottom:14px}.radio-console h2{margin:.1rem 0;font:600 1.55rem Georgia,serif}.radio-lamp{display:flex;gap:7px;align-items:center;font-size:.68rem;font-weight:800;letter-spacing:.08em;border:1px solid #58584d;border-radius:999px;padding:7px 10px;color:#aaa99e;background:#171916}.radio-lamp i{width:10px;height:10px;border-radius:50%;background:#45483e;box-shadow:inset 0 0 4px #000}.radio-lamp.on{color:#dce6ca;border-color:#737e60}.radio-lamp.on i{background:#b9db78;box-shadow:0 0 12px #b9db78}.radio-lamp.hot i{background:#ffbf4d;box-shadow:0 0 15px #ff9b28}.radio-fields{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin-top:17px}.radio-fields label,.transmission-options label{display:flex;flex-direction:column;gap:6px}.radio-fields label span,.transmission-options span,.radio-label{font-size:.73rem;text-transform:uppercase;letter-spacing:.08em;color:#c8bda8;font-weight:700}.radio-fields input,.radio-fields select,.transmission-options select,.radio-paper textarea{width:100%;box-sizing:border-box;border:1px solid #756c5c;background:#141613;color:#f4eddd;border-radius:8px;padding:10px;font:inherit}.radio-relay-field{grid-column:1/-1}.radio-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:17px}.radio-actions.compact{margin-top:12px}.radio-status{margin-top:14px;padding:10px 12px;background:#30352d;border-left:4px solid #95a776;border-radius:5px;color:#dce5cf}.radio-status.error{border-left-color:#c86a5f;background:#3e2926;color:#f1cbc5}.incoming-call{display:flex;align-items:center;gap:14px;margin-top:16px;padding:14px;background:#4a402b;border:1px solid #9b895a;border-radius:10px}.incoming-call small{display:block;color:#d7caa7}.incoming-call strong{display:block}.incoming-call .action{margin-left:auto}.incoming-pulse{width:15px;height:15px;border-radius:50%;background:#f5ca5c;box-shadow:0 0 0 0 #f5ca5c80;animation:radioPulse 1.1s infinite}@keyframes radioPulse{70%{box-shadow:0 0 0 10px #f5ca5c00}}.signal-console{position:relative}.signal-meter{height:54px;display:flex;align-items:flex-end;gap:5px;margin:20px 0;padding:8px 12px;background:#11130f;border:2px inset #5c594f;border-radius:8px}.signal-meter i{flex:1;height:12%;background:#34382f;border-radius:2px;transition:.12s}.signal-meter i:nth-child(2){height:18%}.signal-meter i:nth-child(3){height:26%}.signal-meter i:nth-child(4){height:34%}.signal-meter i:nth-child(5){height:44%}.signal-meter i:nth-child(6){height:55%}.signal-meter i:nth-child(7){height:67%}.signal-meter i:nth-child(8){height:78%}.signal-meter i:nth-child(9){height:88%}.signal-meter i:nth-child(10){height:96%}.signal-meter i:nth-child(11){height:88%}.signal-meter i:nth-child(12){height:75%}.signal-meter i.active{background:#b7c875;box-shadow:0 0 7px #bfdb68}.morse-window{padding:18px;text-align:center;background:#c7c197;color:#24281e;border:5px inset #77735b;border-radius:8px;font-family:'Courier New',monospace}.morse-window small,.morse-window span{display:block}.morse-window strong{display:block;margin:9px 0;font-size:2rem;letter-spacing:.22em}.morse-window span{font-weight:800}.radio-log{height:124px;overflow:hidden;margin-top:14px;padding:10px;background:#11130f;border-radius:7px;font:12px/1.55 'Courier New',monospace;color:#aeb99d}.radio-paper{background:#f3ead4;border:1px solid #cbbb9b;border-radius:12px;padding:25px;box-shadow:0 10px 25px #4c3b2520;background-image:repeating-linear-gradient(0deg,#0000,#0000 31px,#9d8d6d19 32px)}.paper-heading{display:flex;justify-content:space-between;gap:15px;align-items:flex-start;border-bottom:2px solid #7f725d;padding-bottom:11px}.paper-heading h2{margin:.15rem 0;font:600 1.55rem Georgia,serif}.paper-callsign{font:700 1rem 'Courier New',monospace;border:2px solid #786b55;padding:7px 10px;transform:rotate(1deg)}.radio-paper p{color:#6d604d;line-height:1.55}.radio-paper textarea{margin-top:7px;background:#fffaf0;color:#312a20;border-color:#aa9b7f;font-family:'Courier New',monospace;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.transmission-options{display:flex;gap:18px;align-items:end;margin:17px 0}.transmission-options select{background:#fffaf0;color:#312a20;border-color:#aa9b7f}.check-option{flex-direction:row!important;align-items:center;padding-bottom:9px;color:#594e3e!important;text-transform:none!important;letter-spacing:0!important}.check-option input{width:18px;height:18px}.radio-transmit{font-weight:900;letter-spacing:.09em}.paper-tape{margin-top:18px;padding:16px;background:#fbf7eb;border:1px dashed #9b8e75;min-height:80px}.paper-tape small{display:block;color:#7b6d55;letter-spacing:.1em}.paper-tape strong{display:block;margin-top:9px;font:700 1.18rem/1.65 'Courier New',monospace;letter-spacing:.09em;word-break:break-word}.paper-tape.incoming{min-height:170px}.receiver-strip{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0}.receiver-strip span{background:#e1d5bc;border:1px solid #b8a98a;border-radius:5px;padding:7px 9px;font-size:.73rem}.operator-note{margin-top:18px;padding:13px 14px;border-left:4px solid #867450;background:#e9dec5}.operator-note strong,.operator-note span{display:block}.operator-note span{margin-top:5px;color:#645843;line-height:1.45}.radio-history-note{display:flex;align-items:center;gap:20px;margin-top:26px;padding:22px 26px;background:#e5dccb;border-radius:14px}.radio-key-icon{display:grid;place-items:center;min-width:74px;height:74px;border-radius:50%;background:#383229;color:#e8d7ac;font-size:2.5rem}.radio-history-note h2{margin:.15rem 0 .35rem;font:600 1.4rem Georgia,serif}.radio-history-note p{margin:0;line-height:1.55;color:#665b4c}
@media(max-width:900px){.radio-hero{align-items:flex-start;flex-direction:column}.radio-flow{justify-content:flex-start}.radio-console-grid,.radio-operator-grid{grid-template-columns:1fr}.radio-fields{grid-template-columns:1fr 1fr}.radio-relay-field{grid-column:1/-1}}
@media(max-width:620px){.radio-page{padding:20px 12px 50px}.radio-hero{padding:22px 19px}.radio-flow b{display:none}.radio-explainer{align-items:flex-start;flex-direction:column;gap:5px}.radio-console{padding:15px;border-width:5px}.radio-fields{grid-template-columns:1fr}.radio-relay-field{grid-column:auto}.radio-console-head{flex-wrap:wrap;justify-content:flex-start}.radio-console-head>div:first-child{margin-right:auto}.incoming-call{align-items:flex-start;flex-wrap:wrap}.incoming-call .action{margin-left:0;width:100%}.transmission-options{align-items:stretch;flex-direction:column}.radio-history-note{align-items:flex-start;flex-direction:column}.paper-heading{flex-direction:column}.receiver-strip{display:grid;grid-template-columns:1fr 1fr}.morse-window strong{font-size:1.55rem}.radio-paper{padding:18px}}


/* Version 14.2: offline festival network */
.festival-network-note{
    display:flex;align-items:center;gap:8px;margin-top:14px;
    padding:8px 10px;border:1px solid #57594d;border-radius:7px;
    background:#181a17;color:#c7c6b8;font-size:.78rem
}
.network-dot{width:9px;height:9px;border-radius:50%;background:#777;box-shadow:inset 0 0 3px #000}
.network-dot.online{background:#b9db78;box-shadow:0 0 9px #b9db78}
.station-board{
    margin-top:14px;padding:12px;background:#151713;border:1px solid #555749;border-radius:8px
}
.station-board>span{
    display:block;margin-bottom:8px;color:#aaa995;font-size:.68rem;font-weight:800;letter-spacing:.09em
}
.station-board>div{display:flex;flex-wrap:wrap;gap:7px}
.station-board b,.station-board em{
    display:inline-block;padding:5px 8px;border:1px solid #616454;border-radius:999px;
    color:#d8dec7;background:#262a22;font:700 .72rem 'Courier New',monospace
}
.station-board b.self{border-color:#a59363;color:#f2dca1;background:#393322}
.station-board em{color:#929286;font-style:normal;font-weight:400}


/* Version 15: Wireless Operations Experience */
.ops-status-board{display:grid;grid-template-columns:auto 1fr auto auto;align-items:center;gap:16px;margin:20px 0 12px;padding:14px 18px;background:#171a16;color:#eee5d3;border:5px solid #504737;border-radius:12px;box-shadow:inset 0 0 0 1px #766b56}.ops-status-board small,.ops-station-plate small{display:block;font-size:.65rem;letter-spacing:.13em;color:#b9ad96}.ops-status-board strong{display:block;margin-top:2px;font:700 .95rem 'Courier New',monospace;letter-spacing:.08em}.ops-status-light{width:18px;height:18px;border-radius:50%;background:#555;box-shadow:inset 0 0 5px #000}.ops-status-light.ready{background:#b8d66f;box-shadow:0 0 15px #a9d45f}.ops-status-light.receiving,.ops-status-light.transmitting{background:#ffc04d;box-shadow:0 0 18px #ff9e2e;animation:radioPulse .8s infinite}.ops-station-plate{padding-left:18px;border-left:1px solid #5e594e}.visitor-flow{display:flex;align-items:center;justify-content:center;gap:8px;margin:12px 0 20px;padding:12px;background:#e7dfd0;border-radius:10px}.visitor-flow i{font-style:normal;color:#89785e;font-size:1.5rem}.flow-step{display:flex;align-items:center;gap:7px;opacity:.5}.flow-step b{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#756a58;color:#fff;font-size:.75rem}.flow-step span{font-size:.68rem;font-weight:800;letter-spacing:.06em}.flow-step.active,.flow-step.done{opacity:1}.flow-step.active b{background:#9b6a2f;box-shadow:0 0 0 4px #c99b6040}.flow-step.done b{background:#5e7653}.incoming-signal-banner{display:flex;align-items:center;gap:18px;margin:14px 0;padding:17px 22px;background:#4b2d21;color:#fff2d3;border:2px solid #d89a4b;border-radius:10px;box-shadow:0 0 22px #d57d3538}.incoming-signal-banner>span{font-size:2rem;color:#ffc35d;animation:radioPulse .7s infinite}.incoming-signal-banner small,.incoming-signal-banner strong,.incoming-signal-banner em{display:block}.incoming-signal-banner small{letter-spacing:.16em}.incoming-signal-banner strong{font:700 1.3rem 'Courier New',monospace;margin:2px 0}.incoming-signal-banner em{font-style:normal;color:#dfcaa7}.traffic-desk{margin-top:26px;padding:24px;background:#3a342b;border-radius:14px;color:#eee4d1;box-shadow:0 12px 28px #2a211829}.traffic-desk-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #716653;padding-bottom:12px}.traffic-desk-head h2{margin:.1rem 0;font:600 1.5rem Georgia,serif}.traffic-desk-head>span{font-size:.75rem;color:#c7baa3}.traffic-empty{padding:25px;text-align:center;color:#bdb09a;font-style:italic}.traffic-slips{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:16px}.traffic-slip{position:relative;background:#f3ead4;color:#30291f;padding:16px;border:1px solid #bcae91;box-shadow:0 5px 10px #0003;transform:rotate(-.2deg)}.traffic-slip:nth-child(even){transform:rotate(.25deg)}.traffic-slip header{display:flex;justify-content:space-between;border-bottom:2px solid #776a55;padding-bottom:7px;font:700 .82rem 'Courier New',monospace}.slip-meta{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin:9px 0;font-size:.7rem}.slip-meta span{border-bottom:1px solid #c7b99e;padding:3px}.slip-text{min-height:44px;padding:8px;background:#fff9ea;font:700 .9rem/1.55 'Courier New',monospace;letter-spacing:.08em;word-break:break-word}.slip-stamp{position:absolute;right:18px;bottom:12px;border:3px double #8d4f42;color:#8d4f42;padding:3px 8px;font:900 .75rem 'Courier New',monospace;transform:rotate(-8deg);opacity:.75}.museum-note{display:flex;gap:16px;margin-top:20px;padding:14px 18px;border:1px solid #c3b394;background:#f2eadb;color:#665947;border-radius:8px}.museum-note strong{white-space:nowrap;font-size:.72rem;letter-spacing:.1em;color:#5b4b36}.museum-note span{line-height:1.45;font-size:.9rem}
@media(max-width:900px){.ops-status-board{grid-template-columns:auto 1fr auto}.ops-station-plate:last-child{display:none}.visitor-flow{overflow-x:auto;justify-content:flex-start}.traffic-slips{grid-template-columns:1fr}}
@media(max-width:620px){.ops-status-board{grid-template-columns:auto 1fr}.ops-station-plate{display:none}.visitor-flow{padding:10px 8px}.flow-step span{display:none}.visitor-flow i{font-size:1rem}.incoming-signal-banner{padding:14px}.traffic-desk{padding:16px}.museum-note{flex-direction:column;gap:5px}}