*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--panel-bg: #1e1e1e;--metal-light: #3a3a3a;--metal-dark: #111;--green: #00ff88;--yellow: #ffcc00;--red: #ff3333;--dim: #1a1a1a;--text: #ccc;--screw: #2a2a2a}html,body{width:100%;min-height:100%;background:#0a0a0a;font-family:Courier New,monospace;color:var(--text);overflow-y:auto;-webkit-tap-highlight-color:transparent;overscroll-behavior:none}#app{display:flex;justify-content:center;align-items:flex-start;min-height:100dvh;padding:calc(8px + env(safe-area-inset-top)) calc(8px + env(safe-area-inset-right)) calc(24px + env(safe-area-inset-bottom)) calc(8px + env(safe-area-inset-left))}#panel{position:relative;width:100%;max-width:420px;background:linear-gradient(160deg,#2a2a2a,#181818,#222);border:2px solid #444;border-radius:12px;padding:12px;box-shadow:0 0 0 1px #555 inset,0 4px 24px #000c,0 1px #555;display:flex;flex-direction:column;gap:8px}#panel:before,#panel:after{content:"⊕";position:absolute;font-size:14px;color:#3a3a3a;text-shadow:0 1px 0 #555,0 -1px 0 #111}#panel:before{top:8px;left:10px}#panel:after{top:8px;right:10px}#title-bar{display:flex;justify-content:center;align-items:center;gap:8px;padding:4px 0 6px;border-bottom:1px solid #333;position:relative}#btn-mode-toggle{position:absolute;right:0;top:50%;transform:translateY(-50%);flex:none;padding:2px 8px;min-height:28px;font-size:9px;letter-spacing:1px;border-color:#3a3a3a;color:#666}#panel.simple-mode #btn-mode-toggle{border-color:#0f8;color:var(--green);text-shadow:0 0 6px rgba(0,255,136,.4)}.title-text{font-size:13px;font-weight:700;letter-spacing:4px;color:#aaa;text-shadow:0 0 8px rgba(170,170,170,.4)}.indicator{font-size:16px;cursor:default}.indicator.on{color:var(--green);text-shadow:0 0 8px var(--green)}.indicator.off{color:#333}.meter-section{position:relative;background:#0d0d0d;border:1px solid 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2px}#noise-bar{position:absolute;inset:0;border-radius:5px;background:linear-gradient(to right,#1a6b3a,#0f8,#8f0 36%,#fc0 55%,#f80 73%,#f33);opacity:.7}#noise-needle{position:absolute;top:-3px;width:3px;height:16px;background:#fff;border-radius:2px;box-shadow:0 0 6px #fffc;transform:translate(-50%);left:0%;transition:left .3s ease}#noise-zones{display:flex;justify-content:space-between;margin:4px 2px 0;font-size:8px;color:#444;letter-spacing:.5px}#noise-label{text-align:center;font-size:11px;font-weight:700;letter-spacing:1px;color:#aaa;margin-top:4px;min-height:16px}#noise-note{text-align:center;font-size:8px;color:#333;margin-top:2px;letter-spacing:.5px;min-height:10px}#controls{display:flex;gap:6px}.ctl-btn{flex:1;padding:10px 4px;min-height:44px;border:1px solid #444;border-radius:6px;font-family:Courier New,monospace;font-size:11px;font-weight:700;letter-spacing:1px;cursor:pointer;background:linear-gradient(180deg,#2a2a2a,#1a1a1a);color:#aaa;box-shadow:0 2px 4px #0006,0 1px #555 inset;transition:all .1s}.ctl-btn:active:not(:disabled){background:linear-gradient(180deg,#1a1a1a,#222);box-shadow:0 1px 2px #0009,0 -1px #555 inset;transform:translateY(1px)}.ctl-btn:disabled{opacity:.3;cursor:default}.btn-start{border-color:#2a5a2a;color:var(--green);text-shadow:0 0 6px rgba(0,255,136,.4)}.btn-rec{border-color:#5a2a2a;color:var(--red);text-shadow:0 0 6px rgba(255,51,51,.4)}.btn-stop{border-color:#555}.btn-cal{border-color:#3a3a5a;color:#8af;font-size:10px}#controls-2{display:flex;gap:6px}.btn-peak{border-color:#3a3a2a;color:var(--yellow);font-size:10px}.btn-spl{border-color:#2a3a3a;color:#8cf;font-size:10px}.btn-hist{border-color:#2a2a4a;color:#c8f;font-size:10px}.btn-spl.active{border-color:#0af;color:#0cf;text-shadow:0 0 6px rgba(0,200,255,.6)}#spectrum-section canvas{height:100px}#history-panel{background:#0a0a0a;border:1px solid #2a2a2a;border-radius:6px;overflow:hidden}#history-panel canvas{display:block;width:100%;height:120px}#history-controls{display:flex;justify-content:space-between;align-items:center;padding:4px 6px;border-top:1px solid #1a1a1a}#history-controls button{padding:4px 10px;min-height:44px;border-radius:4px;border:1px solid #444;background:#1a1a1a;color:#888;cursor:pointer;font-family:Courier New,monospace;font-size:10px;letter-spacing:1px}#history-range{display:flex;gap:4px}.btn-range{padding:2px 8px;min-height:44px;border-radius:4px;border:1px solid #333;background:#111;color:#666;cursor:pointer;font-family:Courier New,monospace;font-size:9px;letter-spacing:1px}.btn-range.active{border-color:#c8f;color:#c8f;text-shadow:0 0 6px rgba(204,136,255,.5)}#calibration-panel{background:#111;border:1px solid #333;border-radius:6px;padding:12px;font-size:12px;display:flex;flex-direction:column;gap:8px}#calibration-panel input{background:#000;border:1px solid #444;border-radius:3px;color:var(--green);font-family:Courier New,monospace;padding:4px 6px;min-height:44px;width:70px;margin-left:6px}.cal-error{font-size:10px;color:var(--red);text-shadow:0 0 6px rgba(255,51,51,.5);letter-spacing:.5px;margin:0}#calibration-panel button{padding:6px 14px;min-height:44px;border-radius:4px;border:1px solid #444;background:#222;color:#aaa;cursor:pointer;font-family:Courier New,monospace;font-size:11px}#ios-guide{background:#111827;border:1px solid #374151;border-radius:6px;padding:12px;font-size:12px;line-height:1.6;text-align:center}#ios-guide strong{color:var(--yellow)}#ios-guide button{margin-top:8px;padding:6px 20px;min-height:44px;background:#1e40af;border:none;border-radius:4px;color:#fff;cursor:pointer;font-size:12px}.hidden{display:none!important}#help-overlay{position:fixed;inset:0;background:#000000d9;z-index:100;display:flex;justify-content:center;align-items:flex-start;padding:16px 8px;overflow-y:auto;backdrop-filter:blur(4px)}#help-modal{width:100%;max-width:480px;background:#141414;border:1px solid #333;border-radius:10px;box-shadow:0 8px 40px #000c;overflow:hidden}#help-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:#1e1e1e;border-bottom:1px solid #2a2a2a;font-size:13px;font-weight:700;letter-spacing:4px;color:#aaa}#btn-help-close{background:none;border:1px solid #444;border-radius:4px;color:#888;font-size:14px;cursor:pointer;padding:2px 8px;min-height:44px;min-width:44px;font-family:Courier New,monospace}#btn-help-close:hover{color:#ccc;border-color:#666}#help-body{padding:16px;display:flex;flex-direction:column;gap:20px}.help-section h2{font-size:10px;letter-spacing:3px;color:#555;margin-bottom:10px;padding-bottom:4px;border-bottom:1px solid #1e1e1e}.help-item{margin-bottom:12px}.help-label{font-size:11px;font-weight:700;letter-spacing:1px;color:var(--green);text-shadow:0 0 6px rgba(0,255,136,.5);margin-bottom:4px}.help-desc{font-size:11px;line-height:1.7;color:#888}.help-desc 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