:root{font-family:Inter,"Segoe UI","Noto Sans SC","Microsoft YaHei",sans-serif;color:#12243a;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body{margin:0;min-height:100%;scrollbar-width:thin;scrollbar-color:rgba(90,145,126,.38) transparent}html::-webkit-scrollbar{width:6px}html::-webkit-scrollbar-thumb{background:rgba(90,145,126,.38);border-radius:8px}body{--accent:#36a378;--accent-deep:#0f543e;--accent-bg:rgba(90,196,137,.17);--text:#70809b;--bg-image:url('./assets/prea1-bg.png');background:#e8f5ec}body[data-level="a1"]{--accent:#4c91e2;--accent-deep:#173e79;--accent-bg:rgba(96,160,237,.19);--text:#6e80a7;--bg-image:url('./assets/a1-bg.png');background:#e5f1ff}button,select{font:inherit;cursor:pointer}button:focus-visible,select:focus-visible,.lyric-frame:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{height:calc(64px + env(safe-area-inset-top));padding:env(safe-area-inset-top) max(24px,env(safe-area-inset-right)) 0 max(24px,env(safe-area-inset-left))}.header-inner{max-width:1050px;margin:auto;height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-size:19px;letter-spacing:-.7px;color:#21394a;text-decoration:none;font-weight:750}.brand span{color:var(--accent)}.level-menu{display:flex;gap:3px;padding:4px;border-radius:14px;background:rgba(255,255,255,.46)}.level-choice{border:0;background:transparent;padding:8px 15px;border-radius:10px;color:#677a89;font-size:13px;font-weight:650}.level-choice.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px rgba(34,80,69,.12)}
.shell{display:flex;justify-content:center;padding:0 24px 20px;min-height:calc(100svh - 64px - env(safe-area-inset-top))}.reader-panel{position:relative;display:flex;flex-direction:column;width:min(100%,650px);height:calc(100svh - 84px - env(safe-area-inset-top));min-height:440px;max-height:940px;overflow:hidden;border-radius:32px;background-image:var(--bg-image);background-size:100% 100%;box-shadow:0 20px 65px rgba(47,80,100,.12)}.glass{background:rgba(255,255,255,.52);backdrop-filter:blur(17px);-webkit-backdrop-filter:blur(17px);border:1px solid rgba(255,255,255,.65)}.info-panel{flex:none;margin:22px 24px 0;border-radius:24px;padding:16px 20px;z-index:2;max-height:min(38%,240px);overflow:auto;scrollbar-width:thin;scrollbar-color:rgba(84,130,120,.4) transparent}.intro-line{display:flex;align-items:center;gap:12px;min-width:0}.level-pill{color:white;font-size:14px;font-weight:750;background:var(--accent);padding:5px 9px;border-radius:8px;white-space:nowrap}h1{font-size:20px;margin:0;letter-spacing:-.5px;min-width:0;flex:1;overflow-wrap:anywhere}.quiet-button{background:transparent;border:0;color:#687e89;font-size:13px;padding:8px;white-space:nowrap}.info-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;align-items:start;margin-top:15px}.translation,.vocab{min-width:0;overflow-wrap:anywhere;word-break:break-word}.translation{font-size:16px;font-weight:550;line-height:1.5;margin:0}.vocab{border-left:1px solid rgba(38,112,136,.2);padding-left:14px;display:flex;flex-direction:column;gap:4px}.vocab:empty{display:none}.info-grid:has(.vocab:empty){grid-template-columns:1fr}.vocab-line{font-size:13px;line-height:1.5;color:#385060}.vocab-line strong{margin-right:7px}
.lyric-frame{flex:1;min-height:0;position:relative;overflow-y:auto;overflow-x:hidden;scrollbar-width:none;mask-image:linear-gradient(to bottom,transparent,black 7%,black 93%,transparent);-webkit-mask-image:linear-gradient(to bottom,transparent,black 7%,black 93%,transparent);margin:4px 18px;scroll-behavior:smooth}.lyric-frame::-webkit-scrollbar{display:none}.lines{position:relative;padding:28vh 0 34vh;display:flex;flex-direction:column;gap:13px}.sentence{width:fit-content;max-width:calc(100% - 30px);margin:0 15px;padding:4px 13px;line-height:1.38;font-size:clamp(24px,2.45vw,34px);font-weight:600;letter-spacing:-.5px;border-radius:17px;color:var(--text);cursor:pointer;overflow-wrap:anywhere;transition:color .25s,background .25s,opacity .25s}.sentence.active{background:var(--accent-bg);color:var(--accent-deep);font-weight:750}.sentence.read{opacity:.7}.sentence:hover:not(.active){background:rgba(255,255,255,.25)}
.player{flex:none;margin:0 20px 18px;border-radius:20px;padding:12px 16px 10px}.control-row{display:flex;align-items:center;justify-content:space-between;gap:5px;margin-bottom:12px}.control{flex:0 0 42px;width:42px;height:42px;display:grid;place-items:center;border:0;background:transparent;border-radius:13px;color:#39576a}.control:hover,.text-control:hover{background:rgba(255,255,255,.6)}.control svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.control.play{width:48px;height:48px;flex-basis:48px;color:white;background:var(--accent)}.play svg{fill:currentColor;stroke:none}.icon-pause,.play.playing .icon-play{display:none}.play.playing .icon-pause{display:block}.control.on{color:var(--accent-deep);background:var(--accent-bg)}.speed-label{position:relative;flex:none}.speed-label:after{content:'';position:absolute;right:12px;top:15px;width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);pointer-events:none;color:#496478}.speed-label select{appearance:none;-webkit-appearance:none;border:1px solid rgba(93,132,137,.16);border-radius:12px;padding:9px 27px 9px 10px;min-height:40px;background:rgba(255,255,255,.5);color:#39566c;font-size:13px;font-weight:650}.text-control{border:0;background:transparent;border-radius:10px;padding:9px;color:#486279;font-size:13px;white-space:nowrap}.text-control[aria-pressed="true"]{color:var(--accent-deep);background:var(--accent-bg)}.progress-line{height:3px;background:rgba(44,90,131,.12);border-radius:3px;overflow:hidden}.progress-line span{height:100%;width:0;display:block;background:var(--accent);transition:width .2s linear}.player-status:not(:empty){font-size:12px;color:#4c6070;padding:6px 4px 0;line-height:1.4}.player-foot{display:flex;justify-content:space-between;align-items:center;margin-top:3px;color:#718499;font-size:12px}.player-foot .text-control{padding:6px}
@media(max-width:700px){.site-header{height:calc(58px + env(safe-area-inset-top));padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}.header-inner{height:58px}.shell{padding:0;min-height:calc(100svh - 58px - env(safe-area-inset-top))}.reader-panel{width:100%;height:calc(100svh - 58px - env(safe-area-inset-top));min-height:420px;border-radius:24px 24px 0 0;box-shadow:none}.info-panel{margin:14px 15px 0;padding:14px 16px}.sentence{font-size:clamp(23px,5.4vw,34px);margin:0 12px}.lines{padding:26vh 0 30vh;gap:11px}.player{margin:0 12px calc(env(safe-area-inset-bottom) + 12px)}.translation{font-size:15px}}
@media(max-width:370px){.info-panel{padding:12px}.intro-line{gap:8px}h1{font-size:18px}.control{flex-basis:36px;width:36px}.control.play{flex-basis:43px;width:43px}.player{padding:10px}.speed-label select{font-size:12px;padding-left:7px}.text-control{padding:7px}.level-choice{padding:7px 12px}}
@media(max-height:520px){.shell{min-height:0}.reader-panel{min-height:420px}.site-header{height:58px}.header-inner{height:58px}}@media(prefers-reduced-motion:reduce){.lyric-frame{scroll-behavior:auto}.sentence{transition:none}}
.key-word{text-decoration-line:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:.2em;text-decoration-skip-ink:auto}.repeat-count{font-size:12px;color:#668576;white-space:nowrap}
.login-button{border:1px solid rgba(76,130,114,.22);border-radius:12px;padding:9px 16px;background:rgba(255,255,255,.5);font-weight:650;font-size:13px;white-space:nowrap;color:#385c52}.header-inner .level-menu{margin-left:auto}#loginDialog{border:1px solid rgba(255,255,255,.8);border-radius:24px;padding:24px;width:min(360px,calc(100% - 36px));color:#223a49;background:#f4fbf7;box-shadow:0 24px 90px #193c3233}#loginDialog::backdrop{background:rgba(25,44,42,.35);backdrop-filter:blur(3px)}.login-dialog-head{display:flex;justify-content:space-between;align-items:center}.login-dialog-head h2{margin:0;font-size:20px}.close-login{border:0;background:transparent;font-size:25px;color:#688078;padding:0 3px}.login-dialog-head+p{font-size:13px;color:#72887e;margin:13px 0 20px}.login-options{display:grid;gap:10px}.login-options button{border:1px solid #deebe4;background:#eaf4ef;color:#8ba298;border-radius:12px;padding:13px;font-weight:600;cursor:not-allowed}@media(max-width:370px){.header-inner{gap:7px}.brand{font-size:17px}.level-choice{padding:7px 9px}.login-button{padding:8px 10px}}