:root{color-scheme:dark;font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#090e10;color:#edf3ed;font-synthesis:none;-webkit-text-size-adjust:100%}
*{box-sizing:border-box}body{margin:0}#load{font:inherit}main{max-width:520px;min-height:100vh;min-height:100dvh;margin:auto;background:#111719;padding-bottom:calc(126px + env(safe-area-inset-bottom,0px))}
header{padding:calc(18px + env(safe-area-inset-top,0px)) 20px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px}.brand{display:flex;align-items:center;gap:9px;font-size:16px;font-weight:700;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:29px;height:29px;border-radius:9px;background:#c2ef95;color:#182710;font-size:13px}.header-note{font-size:11px;color:#a3b1ac}
.screen{position:relative;aspect-ratio:16/9;background:#050808;width:100%;isolation:isolate}.screen:fullscreen{aspect-ratio:auto;height:100%;max-width:none}#player{width:100%;height:100%}.player-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:#a3b1ac;font-size:12px;pointer-events:none;background:radial-gradient(ellipse at 50% 100%,#25352c 0%,#101a16 45%,#080e0b 100%)}.play-symbol{display:grid;place-items:center;width:54px;height:54px;border:1px solid #bce59866;border-radius:50%;color:#c2ef95;font-size:19px;padding-left:3px}
.lesson{padding:26px 22px 22px}.eyebrow{display:flex;align-items:center;gap:7px;font-size:11px;color:#bad7a4;letter-spacing:1px}.dot{width:5px;height:5px;background:#c2ef95;border-radius:50%}.divider{margin:0 4px;color:#53615b}h1{font-size:24px;line-height:1.45;letter-spacing:-.5px;margin:13px 0 8px}p{margin:0}.intro{font-size:13px;line-height:1.8;color:#a3b1ac}.status-box{display:flex;gap:9px;align-items:flex-start;margin-top:22px;padding:13px 14px;background:#1b2521;border:1px solid #2d3c33;border-radius:10px}.status-dot{width:6px;height:6px;flex-shrink:0;margin-top:7px;border-radius:50%;background:#c2ef95}#status{font-size:12px;line-height:1.75;color:#cbd8ce;overflow-wrap:anywhere}
.guide{margin:0 22px;padding:21px 0 5px;border-top:1px solid #2a3430}h2{font-size:14px;font-weight:600;margin:0 0 22px}.tip{display:flex;gap:14px;margin-bottom:22px}.tip-number{padding-top:2px;font-size:12px;color:#a6bc94;font-variant-numeric:tabular-nums}h3{font-size:13px;font-weight:500;margin:0 0 5px}.tip p{font-size:12px;line-height:1.8;color:#8f9e97}footer{text-align:center;font-size:11px;color:#798a80;padding:15px 20px}
.actions{position:fixed;z-index:10;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:520px;background:#111719f5;border-top:1px solid #29352e;padding:14px 22px calc(12px + env(safe-area-inset-bottom,0px));backdrop-filter:blur(14px)}#load{display:block;width:100%;min-height:50px;border:0;border-radius:12px;background:#c2ef95;color:#1c2d12;font-weight:650;font-size:15px;cursor:pointer;touch-action:manipulation}#load:hover{background:#d2f7af}#load:active{transform:translateY(1px)}#load:disabled{opacity:.55;cursor:wait}#load:focus-visible{outline:3px solid #fff;outline-offset:3px}.action-note{display:block;text-align:center;font-size:10px;color:#91a18f;margin-top:8px}
@media(min-width:600px){main{box-shadow:0 0 80px #0005}.lesson{padding-top:30px}}
#account{background:transparent;color:#c2ef95;border:1px solid #42523c;border-radius:20px;min-height:40px;padding:6px 12px;font-size:12px;cursor:pointer}
dialog{color:#edf3ed;background:#17201b;border:1px solid #3b4c40;border-radius:20px;width:calc(100% - 32px);max-width:400px;max-height:90dvh;padding:30px 22px;overflow-y:auto}dialog::backdrop{background:#000b}dialog h2{font-size:23px;margin:0 30px 12px 0}.login-intro{color:#a3b1ac;font-size:13px;line-height:1.7;margin-bottom:22px}#close-login{position:absolute;right:10px;top:8px;width:44px;height:44px;border:0;background:none;color:#cbd8ce;font-size:28px;cursor:pointer}form>label{display:block;font-size:13px;margin:16px 0 8px}input:not([type=checkbox]){display:block;min-width:0;width:100%;height:48px;border:1px solid #53614e;background:#0f1712;color:#fff;border-radius:9px;font:inherit;font-size:16px;padding:10px 12px}input:focus{outline:2px solid #c2ef95;outline-offset:2px}.code-row{display:flex;gap:10px}.code-row input{flex:1}#send-code{flex-shrink:0;min-height:48px;padding:0 10px;border:1px solid #5d7150;background:#263520;color:#d5efc0;border-radius:9px;font-size:13px;cursor:pointer}.consent{display:flex;align-items:flex-start;gap:8px;font-size:11px;line-height:1.8;color:#a3b1ac}.consent input{margin-top:4px;flex-shrink:0;width:18px;height:18px;accent-color:#c2ef95}#login-status{min-height:24px;font-size:12px;color:#f2d6a5;line-height:1.7;margin:12px 0}#login-submit{width:100%;height:50px;border:0;background:#c2ef95;color:#1c2d12;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer}#send-code:disabled,#login-submit:disabled{opacity:.5;cursor:wait}
@media(max-width:350px){header{padding-left:16px;padding-right:16px}.header-note{font-size:10px}.lesson{padding-left:16px;padding-right:16px}h1{font-size:21px}.guide{margin-left:16px;margin-right:16px}.actions{padding-left:16px;padding-right:16px}}
@media(orientation:landscape) and (max-height:500px){main{max-width:760px;padding-bottom:20px}.screen{max-height:72vh;aspect-ratio:16/9;width:auto;margin:auto}.actions{position:static;transform:none;max-width:none;margin-top:18px}.lesson{padding-top:20px}}