@font-face{font-family:NNT;src:local("Inter"),local("Arial");font-display:swap}
:root{font-family:NNT,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#242b29;background:#f7f9f8;font-synthesis:none;letter-spacing:0;--line:#e0e6e3;--mint:#c3efdf;--muted:#75817c;--header:76px}
*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button{color:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:disabled{cursor:wait;opacity:.6}[hidden]{display:none!important}:focus-visible{outline:2px solid #388e71;outline-offset:4px}button{letter-spacing:0}.header{height:var(--header);padding:0 40px;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--line);position:fixed;inset:0 0 auto;z-index:40}.brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:650}.brand img{border-radius:6px;object-fit:contain}.account{position:relative}.avatar-button{height:34px;width:34px;padding:0;border:1px solid #cfdad5;border-radius:50%;background:#e1eee7;overflow:hidden;display:grid;place-items:center;font-size:14px;font-weight:600}.avatar-button img{width:100%;height:100%;object-fit:cover;grid-area:1/1}.avatar-button span{grid-area:1/1}.account-menu{position:absolute;right:0;top:46px;width:248px;max-width:calc(100vw - 32px);background:white;border:1px solid var(--line);border-radius:8px;padding:16px;box-shadow:0 8px 28px #202c2610}.account-menu p{margin:0 0 4px;overflow-wrap:anywhere;font-size:14px}.account-menu .muted{font-size:12px;margin-bottom:14px}.account-menu button,.account-menu a{display:block;width:100%;padding:10px 0;text-align:left;border:0;background:none;font-size:13px}.account-menu .danger{color:#a74444}.muted{color:var(--muted)}.library{padding-top:var(--header)}.cards-region{margin-left:76px;padding:36px 40px 64px;max-width:1380px}.view-heading{min-height:36px;margin-bottom:26px;display:flex;align-items:center;gap:12px}.view-heading h1{font-size:19px;font-weight:600;line-height:1.5;margin:0;overflow-wrap:anywhere;min-width:0}.view-meta{color:var(--muted);font-size:12px;margin-left:auto;white-space:nowrap}.icon-button{width:32px;height:32px;border:0;background:transparent;display:inline-grid;place-items:center;border-radius:6px;flex-shrink:0}.icon-button:hover{background:#e8eeeb}.icon-button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:4px;column-gap:24px;position:relative;align-items:start}.word-card{min-width:0;align-self:start}.card-inner{background:#fff;border:1px solid var(--line);border-radius:8px;padding:25px 24px 18px;overflow:hidden}.word-card:hover .card-inner{border-color:#b8cfc3}.card-term{margin:0;font-size:23px;font-weight:600;line-height:1.35;overflow-wrap:anywhere}.card-source-term{display:block;color:#6c8377;font-size:13px;line-height:1.6;margin-top:6px;overflow-wrap:anywhere}.card-explanation{margin:20px 0 24px;font-size:14px;line-height:1.85;white-space:pre-wrap;overflow-wrap:anywhere}.card-footer{border-top:1px solid #edf0ee;padding-top:14px;display:flex;align-items:center;gap:9px;min-width:0;color:#78847e}.card-footer img{width:38px;height:26px;object-fit:cover;flex-shrink:0;border-radius:3px;background:#edf1ee}.card-video-title{font-size:11px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-width:0}.card-footer time{margin-left:auto;font-size:11px;flex-shrink:0;font-variant-numeric:tabular-nums}.card-footer:hover{color:#286c51}.cards-state{text-align:center;color:var(--muted);font-size:14px;padding:64px 20px}.cards-state:empty{display:none}.cards-state p{margin:0 0 16px}.more-row{text-align:center;padding-top:16px}.plain-button,.delete-button{background:#fff;border:1px solid #ccd8d1;border-radius:6px;padding:10px 18px;font-size:13px;min-height:38px}.plain-button:hover{background:#eef5f0}.text-button{border:0;background:none;padding:12px 0;font-size:12px;color:#587564}.timeline{position:fixed;top:var(--header);bottom:0;left:0;z-index:30;width:76px;transition:width .18s ease;background:#f7f9f8}.timeline.is-open{width:282px;box-shadow:12px 0 24px #24362b0a;border-right:1px solid var(--line);background:#fff}.timeline-ruler{position:absolute;inset:0;display:flex;justify-content:center;padding-top:92px}.timeline-ruler>button{border:0;background:none;width:56px;padding:0 12px;align-self:flex-start;text-align:left;min-height:280px}.timeline.is-open .timeline-ruler{display:none}.ruler-year{display:block;font-size:10px;font-weight:600;color:#65766d;margin:0 0 18px}.ruler-tick{display:block;width:17px;height:1px;background:#a9bbb1;margin:0 0 10px}.ruler-tick.major{width:25px;background:#6c897a}.ruler-tick.active{height:2px;background:#33795a;width:27px}.timeline-detail{position:absolute;inset:0;width:281px;padding:24px 22px;overflow-y:auto;opacity:0;visibility:hidden}.timeline.is-open .timeline-detail{opacity:1;visibility:visible}.timeline-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.timeline-heading h2{font-size:13px;font-weight:500;color:var(--muted);margin:0}.timeline-heading .icon-button{width:26px;height:26px}.timeline-year{font-size:20px;line-height:1.3;margin:26px 0 20px;font-weight:650}.timeline-year:first-child{margin-top:4px}.timeline-date{margin:18px 0 9px;font-size:11px;color:#7f8b84;font-variant-numeric:tabular-nums}.timeline-video{width:100%;border:0;display:flex;align-items:flex-start;gap:9px;background:transparent;text-align:left;border-radius:6px;padding:7px;margin-left:-7px;box-sizing:content-box}.timeline-video:hover,.timeline-video[aria-current=true]{background:#e9f4ed}.timeline-video img{width:93px;height:54px;object-fit:cover;border-radius:4px;background:#edf1ee;flex-shrink:0}.timeline-video-title{font-size:11px;line-height:1.55;overflow-wrap:anywhere;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.timeline-state{color:var(--muted);font-size:12px;line-height:1.8}.mobile-timeline,.timeline-scrim{display:none}.sign-in{min-height:100svh;padding:calc(var(--header) + 80px) 24px 80px;display:flex;align-items:center;flex-direction:column;justify-content:center}.sign-in>img{margin-bottom:22px}.sign-in h1{font-size:26px;font-weight:600;margin:0 0 32px}.google-sign-in{min-height:44px;display:flex;align-items:center;justify-content:center;gap:12px;padding:0 24px;border:1px solid #cfdad4;border-radius:6px;background:#fff;font-size:14px}.google-sign-in:hover{background:#edf5f0}.privacy-link{font-size:12px;color:var(--muted);margin-top:25px}.center-state{min-height:100svh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:100px 24px;color:var(--muted);font-size:14px}.spinner{display:block;height:20px;width:20px;border:2px solid #dce7df;border-top-color:#4c8769;border-radius:50%;animation:spin .8s linear infinite}.notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#273d30;color:#fff;padding:12px 18px;border-radius:6px;z-index:80;max-width:calc(100vw - 32px);font-size:13px}dialog{border:1px solid var(--line);border-radius:8px;max-width:420px;width:calc(100% - 32px);padding:28px;color:#25332b}dialog::backdrop{background:#14261e40}dialog h2{margin:0 0 16px;font-size:19px}dialog p{font-size:14px;color:#6d7b72;line-height:1.7}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}.delete-button{background:#a94040;color:#fff;border-color:#a94040}.error{color:#a94040!important}.privacy-page{max-width:700px;padding:calc(var(--header) + 64px) 24px 80px;margin:auto}.privacy-page h1{font-size:25px;margin:0 0 34px}.privacy-page h2{font-size:16px;margin:32px 0 12px}.privacy-page p{font-size:14px;line-height:1.9;color:#59685e}.privacy-page a{color:#286c51;text-decoration:underline}@keyframes spin{to{transform:rotate(360deg)}}
@media(min-width:1600px){.cards-region{margin-left:auto;margin-right:auto;padding-left:76px;padding-right:40px}}
@media(max-width:1150px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.cards-region{padding-right:28px;padding-left:24px}}
@media(max-width:700px){:root{--header:64px}.header{padding:0 20px}.brand{font-size:17px}.brand img{width:29px;height:29px}.cards-region{margin-left:0;padding:24px 20px 48px}.view-heading{margin-left:38px;margin-bottom:24px;min-height:32px;gap:8px}.view-heading h1{font-size:17px}.view-meta{display:none}.cards{grid-template-columns:minmax(0,1fr);column-gap:0}.card-inner{padding:24px 22px 18px}.mobile-timeline{display:grid;position:absolute;top:88px;left:17px;z-index:10}.timeline{width:282px;background:#fff;transform:translateX(-100%);transition:transform .18s ease;z-index:60;top:0}.timeline.is-open{transform:translateX(0);width:282px}.timeline-ruler{display:none}.timeline-detail{padding-top:24px}.timeline-scrim:not([hidden]){display:block;position:fixed;inset:0;border:0;background:#14261e40;z-index:50}.sign-in{padding-top:calc(var(--header) + 48px)}.card-term{font-size:22px}.timeline-video{box-sizing:border-box;width:calc(100% + 14px)}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition:none!important}}
.timeline-video-time{display:block;font-size:10px;color:#7f8b84;margin-top:5px;font-variant-numeric:tabular-nums}
.cards{--card-columns:3}
@media(max-width:1150px){.cards{--card-columns:2}}
@media(max-width:700px){.cards{--card-columns:1}}