:root{color:#171717;font-synthesis:none;--header-height:68px;--sidebar-width:232px;--sidebar-collapsed-width:72px;--color-background:#fff;--color-surface:#f7f7f7;--color-surface-hover:#ededed;--color-text:#171717;--color-text-secondary:#606060;--color-border:#d9d9d9;--color-brand:#1469d2;--color-brand-dark:#0b4f9f;--color-focus:#0b66c3;--color-warning:#805b00;--radius-card:14px;--radius-control:999px;--shadow-soft:0 3px 14px #00000014;--content-gap:24px;background:#fff;font-family:Arial,Noto Sans KR,system-ui,sans-serif}*{box-sizing:border-box}html{background:var(--color-background);min-width:320px;min-height:100%}body{background:var(--color-background);min-width:320px;min-height:100vh;color:var(--color-text);margin:0}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--color-focus);outline-offset:3px}button:disabled{cursor:not-allowed;opacity:.58}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.app-header{z-index:50;height:var(--header-height);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fffffff7;border-bottom:1px solid #ececec;grid-template-columns:minmax(210px,1fr) minmax(340px,640px) minmax(180px,1fr);align-items:center;gap:24px;padding:0 24px 0 16px;display:grid;position:fixed;inset:0 0 auto}.header-leading,.header-actions{align-items:center;gap:12px;display:flex}.header-actions{justify-content:flex-end}.icon-button{cursor:pointer;background:0 0;border:0;border-radius:50%;flex:0 0 44px;place-items:center;width:44px;height:44px;padding:0;display:inline-grid}.icon-button:hover{background:var(--color-surface-hover)}.brand{letter-spacing:-.045em;white-space:nowrap;align-items:center;gap:9px;min-height:44px;font-size:1.28rem;font-weight:800;display:inline-flex}.brand-symbol{background:linear-gradient(145deg, var(--color-brand), #56a6f5);color:#fff;border-radius:10px 13px;place-items:center;width:36px;height:30px;display:grid;transform:rotate(-2deg);box-shadow:0 3px 8px #1469d23d}.brand-symbol span{margin-left:2px;font-size:.9rem;transform:rotate(2deg)}.search-bar{border-radius:var(--radius-control);background:#fff;border:1px solid #bdbdbd;grid-template-columns:1fr auto auto;align-items:center;height:46px;display:grid;overflow:hidden;box-shadow:inset 0 1px 2px #00000008}.search-bar:focus-within{border-color:var(--color-focus);box-shadow:inset 2px 0 var(--color-focus)}.search-bar input{width:100%;min-width:0;height:100%;color:var(--color-text);background:0 0;border:0;outline:0;padding:0 8px 0 20px;font-size:1rem}.search-bar input::placeholder{color:#6d6d6d;opacity:1}.search-clear,.search-submit{cursor:pointer;background:0 0;border:0;place-items:center;width:44px;height:44px;padding:0;display:grid}.search-submit{border-left:1px solid var(--color-border);background:#f8f8f8;width:64px}.search-clear:hover,.search-submit:hover{background:#ededed}.time-chip{border-radius:var(--radius-control);color:#164c85;white-space:nowrap;background:#e8f2ff;align-items:center;gap:7px;min-height:42px;padding:0 14px;display:flex}.mobile-search-button,.mobile-search-panel{display:none}.side-navigation{z-index:40;top:var(--header-height);width:var(--sidebar-width);background:#fff;border-right:1px solid #eee;padding:16px 12px;transition:width .18s;position:fixed;bottom:0;left:0}.side-navigation nav{gap:4px;display:grid}.side-navigation a{border-radius:12px;align-items:center;gap:20px;min-height:48px;padding:0 16px;font-size:.96rem;font-weight:600;display:flex}.side-navigation a:hover{background:var(--color-surface)}.side-navigation a.active{background:#e9e9e9;font-weight:800}.side-navigation svg{flex:0 0 24px}.side-navigation>p{color:var(--color-text-secondary);margin:24px 12px;font-size:.78rem;line-height:1.55}.side-navigation.collapsed{width:var(--sidebar-collapsed-width);padding-inline:8px}.side-navigation.collapsed a{justify-content:center;min-height:58px;padding:0}.side-navigation.collapsed a span{clip:rect(0,0,0,0);width:1px;height:1px;position:absolute;overflow:hidden}.child-content{min-height:100vh;margin-left:var(--sidebar-width);padding:calc(var(--header-height) + 24px) clamp(20px, 3vw, 42px) 56px;transition:margin-left .18s}.navigation-collapsed .child-content{margin-left:var(--sidebar-collapsed-width)}.mobile-navigation{display:none}.library-page,.search-page,.watch-page{width:min(100%,1500px);margin:0 auto}.page-heading{justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:18px;display:flex}.page-heading h1{letter-spacing:-.04em;margin:0;font-size:clamp(1.55rem,2vw,2rem)}.page-heading p{color:var(--color-text-secondary);margin:7px 0 0;font-size:.95rem}.eyebrow{color:var(--color-brand-dark);letter-spacing:.04em;margin-bottom:5px;font-size:.76rem;font-weight:800;display:block}.result-count{border-radius:var(--radius-control);background:var(--color-surface);color:var(--color-text-secondary);flex:none;padding:7px 11px;font-size:.84rem;font-weight:700}.gentle-notice{color:#624a12;background:#fff3cf;border-radius:12px;margin:0 0 20px;padding:13px 16px;font-weight:700}.gentle-notice.time-over{color:#245b3d;background:#e9f5ed}.video-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:30px 18px;display:grid}.video-card{border-radius:var(--radius-card);min-width:0}.video-card-link{border-radius:var(--radius-card);display:block}.video-card-link:hover .video-thumbnail,.video-card-link:focus-visible .video-thumbnail{box-shadow:var(--shadow-soft);transform:translateY(-2px)}.video-thumbnail{aspect-ratio:16/9;border-radius:var(--radius-card);background:#dce9ef;transition:transform .16s,box-shadow .16s;position:relative;overflow:hidden}.video-thumbnail img{object-fit:cover;width:100%;height:100%}.placeholder-art{background:linear-gradient(145deg,#d9eff4,#78bfd2);place-items:center;width:100%;height:100%;display:grid}.placeholder-art span{filter:drop-shadow(0 6px 5px 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0;font-size:.84rem}.favorite-mark{color:#a76300;font-size:1.16rem}.demo-label{color:#777;margin-top:5px;font-size:.7rem;display:block}.load-more{border:1px solid var(--color-border);border-radius:var(--radius-control);min-width:180px;min-height:46px;color:var(--color-brand-dark);cursor:pointer;background:#fff;margin:34px auto 0;padding:0 22px;font-weight:800;display:block}.load-more:hover{background:var(--color-surface)}.empty-state{background:var(--color-surface);text-align:center;border-radius:20px;place-content:center;justify-items:center;gap:8px;min-height:300px;padding:32px;display:grid}.empty-state>span{font-size:3.6rem}.empty-state p{color:#4f4f4f;max-width:520px;margin:4px 0 10px;font-size:1.05rem;line-height:1.65}.primary-button,.secondary-button{background:var(--color-brand);color:#fff;cursor:pointer;border:0;border-radius:12px;justify-content:center;align-items:center;min-height:46px;padding:0 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380px;gap:28px;display:grid}.back-link{min-height:44px;color:var(--color-text-secondary);align-items:center;gap:5px;margin-bottom:8px;font-size:.9rem;font-weight:700;display:inline-flex}.youtube-frame,.player-placeholder{aspect-ratio:16/9;background:#090909;border-radius:16px;width:100%;overflow:hidden}.youtube-frame>div,.youtube-frame iframe{width:100%;height:100%}.player-placeholder{color:#fff;text-align:center;place-content:center;justify-items:center;padding:30px;display:grid}.player-placeholder span{font-size:3.4rem}.player-placeholder p{font-size:1.06rem}.demo-warning,.player-error{color:#675016;background:#fff2c7;border-radius:10px;margin:0 0 12px;padding:12px 14px;font-size:.86rem}.player-error{color:#852c22;background:#ffe9e5;margin-top:12px}.watch-info h1{letter-spacing:-.03em;margin:16px 0 12px;font-size:clamp(1.35rem,2.3vw,1.9rem)}.watch-meta{justify-content:space-between;align-items:center;gap:18px;display:flex}.watch-meta>div{gap:3px;display:grid}.watch-meta 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form{gap:14px;display:grid}.auth-card label{gap:7px;font-weight:700;display:grid}.google-signin-slot{place-items:center;min-height:44px;display:grid}.membership-summary{gap:8px;margin:0;display:grid}.membership-summary div{background:#f3f6fa;border-radius:10px;justify-content:space-between;gap:16px;padding:10px 12px;display:flex}.membership-summary dt{color:var(--color-text-secondary)}.membership-summary dd{margin:0;font-weight:800}.family-management-card,.migration-card{grid-column:1/-1}.invite-actions,.migration-card>div{flex-wrap:wrap;gap:10px;display:flex}.invite-code-result{background:#edf6ff;border-radius:12px;gap:6px;margin:14px 0;padding:16px;display:grid}.invite-code-result code{letter-spacing:.12em;font-size:1.35rem;font-weight:900}.member-list{gap:8px;margin-bottom:20px;display:grid}.member-row{border:1px solid #e4e8ee;border-radius:11px;justify-content:space-between;align-items:center;gap:14px;padding:11px;display:flex}.member-row>div:last-child{flex-wrap:wrap;gap:7px;display:flex}.member-identity{align-items:center;gap:10px;min-width:0;display:flex}.member-identity img,.member-identity>span{object-fit:cover;background:#edf1f6;border-radius:50%;flex:none;place-items:center;width:42px;height:42px;display:grid}.member-identity strong,.member-identity small{overflow-wrap:anywhere;display:block}.member-identity small{color:var(--color-text-secondary);margin-top:3px}.status-toast{z-index:100;color:#fff;max-width:calc(100% - 30px);box-shadow:var(--shadow-soft);text-align:center;background:#17365c;border-radius:12px;padding:13px 18px;position:fixed;bottom:20px;left:50%;transform:translate(-50%)}.update-toast{align-items:center;gap:9px;display:flex}.update-toast button{cursor:pointer;background:#fff;border:0;border-radius:8px;min-height:44px;padding:0 12px}@media 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