@import"https://fonts.googleapis.com/css2?family=Exo+2:wght@400;600;700&display=swap";:root{--bg-top: #f7f8f5;--bg-bottom: #d8e3ef;--panel: rgba(255, 255, 255, .78);--panel-border: rgba(15, 33, 56, .18);--text-main: #13253d;--text-subtle: #365170;--button: #0f4c81;--button-hover: #0a3a63;--input-bg: #fefefe}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:"Exo 2",Trebuchet MS,sans-serif;color:var(--text-main);background:radial-gradient(circle at 15% 10%,rgba(255,146,67,.25),transparent 32%),radial-gradient(circle at 85% 80%,rgba(14,169,255,.25),transparent 34%),linear-gradient(165deg,var(--bg-top),var(--bg-bottom))}.app-shell{width:100%;min-height:100vh;padding:28px;display:grid;place-items:center}.card{width:min(920px,100%);border:1px solid var(--panel-border);border-radius:24px;padding:28px 28px 24px;background:var(--panel);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 18px 40px #0b1b2f1f,inset 0 1px #ffffff73}h1{margin:0;font-size:clamp(1.65rem,2.3vw,2.25rem);letter-spacing:.02em}.subtitle{margin:8px 0 20px;color:var(--text-subtle);font-size:1.02rem}.visualizer-wrap{width:min(560px,100%);margin:0 auto;aspect-ratio:1}#melody-visualizer{width:100%;height:100%;display:block}.controls{margin:18px auto 0;width:min(560px,100%);display:grid;gap:8px}.controls label{font-weight:600}.control-row{display:flex;gap:10px}#shift-input{width:140px;border:1px solid rgba(18,44,74,.28);border-radius:12px;padding:10px 12px;font:inherit;font-size:1rem;background:var(--input-bg);color:var(--text-main)}#shift-input:focus-visible,#play-button:focus-visible{outline:3px solid rgba(9,111,183,.3);outline-offset:1px}#play-button{min-width:110px;border:none;border-radius:12px;padding:10px 16px;font:inherit;font-weight:700;letter-spacing:.01em;color:#fff;background:var(--button);cursor:pointer;transition:transform .15s ease,background-color .15s ease}#play-button:hover{transform:translateY(-1px);background:var(--button-hover)}#play-button:active{transform:translateY(0)}.readout{margin:4px 0 0;color:var(--text-subtle);font-size:.98rem}.outer-guide{fill:#ffffff2e;stroke:#0b1f3214;stroke-width:1}.base-guide{fill:#ffffff4d;stroke:#0b1f321f;stroke-width:1}.note-sector{stroke:#ffffffd9;stroke-width:1;fill-opacity:.84;transition:fill-opacity .11s ease,filter .11s ease}.note-sector.sector-active{fill-opacity:1;filter:brightness(1.2) saturate(1.15)}.history-layer{fill-opacity:.72;stroke:#ffffffa3;stroke-width:.8}.note-label{fill:#08253f;font-size:16px;font-weight:700;text-anchor:middle;dominant-baseline:middle}.inner-circle{fill:#f3f8fc;stroke:#08243f2e;stroke-width:1.25}.arrow-shaft{stroke:#112f4b;stroke-width:6;stroke-linecap:round}.arrow-tip,.arrow-hub{fill:#112f4b}.center-readout{fill:#112f4b;font-size:18px;font-weight:700;text-anchor:middle}@media(max-width:700px){.app-shell{padding:14px}.card{padding:18px 16px 16px;border-radius:18px}.control-row{flex-wrap:wrap}#shift-input{width:100%;min-width:0}#play-button{width:100%}.note-label{font-size:14px}}