:root{font-family:system-ui,-apple-system,sans-serif;color:#253329;background:#f5f5f0;--nav-height: calc(64px + env(safe-area-inset-bottom,0px)) }*{box-sizing:border-box}body{margin:0;min-width:320px;-webkit-text-size-adjust:100%}button,input{font:inherit}button,a,summary{touch-action:manipulation}button{min-height:44px;padding:9px 14px;border:1px solid #cbd4c7;border-radius:8px;background:#fff;color:#30513d;cursor:pointer}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,[tabindex]:focus-visible,summary:focus-visible{outline:2px solid #527137;outline-offset:2px}input{min-height:48px;font-size:16px;padding:12px;border:1px solid #becab8;border-radius:8px;max-width:100%;min-width:0;background:#fff}h1{font-size:24px;margin:0 0 24px}p{line-height:1.7}a{color:#30513d}[hidden]{display:none!important}.app-shell{min-height:100dvh;padding-bottom:var(--nav-height)}.page{max-width:760px;margin:auto;padding:32px max(20px,env(safe-area-inset-right)) 32px max(20px,env(safe-area-inset-left))}.input-page{padding-top:max(64px,env(safe-area-inset-top));display:flex;flex-direction:column;gap:20px}.url-form{display:flex;flex-direction:column;gap:14px}.url-form label{font-weight:600}.url-form input{width:100%}.primary,.save-word>button{background:#30513d;color:#fff;border-color:#30513d}.text-button{background:transparent;border-color:transparent}.input-page>.text-button{align-self:flex-start}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:10;height:var(--nav-height);padding:6px max(8px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));display:flex;background:#fff;border-top:1px solid #dfe5da}.bottom-nav button{flex:1;border:0;background:transparent;font-size:14px;font-weight:600}.bottom-nav button[aria-current=page]{color:#284832;background:#eaf0e3}.watch-screen{position:fixed;inset:0 0 var(--nav-height);display:flex;flex-direction:column;overflow:hidden}.video-area{flex-shrink:0}.player-frame{position:relative;width:100%;height:clamp(200px,56.25vw,42dvh);background:#17241c}.player-frame>#youtube-player,.player-frame iframe{width:100%;height:100%;border:0}.player-frame iframe{position:absolute;top:0;right:0;bottom:0;left:0}.player-controls{display:flex;align-items:center;gap:8px;padding:8px max(10px,env(safe-area-inset-right)) 8px max(10px,env(safe-area-inset-left))}.player-controls button{font-size:14px}.change-video{margin-left:auto}.learning-panel{display:flex;flex-direction:column;min-height:0;height:40%;flex-shrink:1;margin-top:auto;border-top:1px solid #dce4d4;border-radius:16px 16px 0 0;background:#fff;overflow:hidden;padding:0 env(safe-area-inset-right) 0 env(safe-area-inset-left)}.learning-panel.has-explanation{flex:1;height:auto;margin-top:8px}.caption-list{position:relative;flex:1;min-height:0;overflow:auto;padding:8px;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.caption-line{display:grid;grid-template-columns:48px minmax(0,1fr);gap:8px;align-items:start;padding:8px;border-radius:8px;color:#66705f;line-height:1.7}.caption-line.active{background:#eaf1e2;color:#253f2c}.caption-line>span{min-width:0;overflow-wrap:anywhere}.caption-seek{border:0;background:transparent;padding:8px 0;font-size:12px;font-variant-numeric:tabular-nums;color:#687d5a}.word-button{border:0;border-bottom:1px dotted #aab99c;background:transparent;color:inherit;min-height:44px;padding:4px;max-width:100%;overflow-wrap:anywhere;font-size:16px;border-radius:3px}.word-button:hover{background:#e0ead4}.caption-toolbar{display:flex;justify-content:flex-end;padding:4px 12px;border-bottom:1px solid #edf0e9}.caption-toolbar button{font-size:13px}.panel-message{padding:12px 18px;margin:0;overflow:auto;flex-shrink:1}.panel-message button{margin:4px}.error-banner{background:#fae9e3;color:#933a27;padding:12px;font-size:14px;overflow-wrap:anywhere}.error-banner button{margin:8px}.video-area>.error-banner{max-height:100px;overflow:auto;margin:0}.word-explanation{display:flex;flex-direction:column;flex:1;min-height:0}.explanation-top{display:flex;align-items:center;gap:16px;padding:8px 16px;border-bottom:1px solid #e5eadd}.explanation-top button{flex-shrink:0}.explanation-top h2{font-size:20px;margin:0;overflow-wrap:anywhere}.explanation-body{flex:1;min-height:0;overflow:auto;padding:0 20px;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.explanation-actions{padding:8px 16px;border-top:1px solid #e5eadd;background:#fff}.save-word>button{width:100%}.save-word p{font-size:13px;margin:4px 0}.explanation-note,.saved-date{font-size:12px;color:#68725f;line-height:1.7}blockquote{margin:16px 0;padding:12px;border-left:3px solid #9eb58a;background:#f0f4ea;overflow-wrap:anywhere}.explanation-details dt{font-size:13px;color:#61794f;margin-top:16px;font-weight:700}.explanation-details dd{margin:4px 0;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}.uncertainty{background:#fff1d7;padding:12px;line-height:1.7}.auth-panel{padding:16px;background:#edf2e6;border-radius:10px;font-size:14px}.auth-account,.wordbook-tools,.word-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.auth-account span{flex:1;min-width:0;overflow-wrap:anywhere}.word-search{display:flex;align-items:end;gap:10px;margin:20px 0}.word-search label{display:flex;flex-direction:column;gap:8px;flex:1;min-width:0}.word-search input{width:100%}.wordbook-tools{margin:16px 0}.word-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}.word-list>li{background:#fff;border:1px solid #dfe5d9;border-radius:10px;padding:18px;overflow-wrap:anywhere}.word-list h3{margin:0;font-size:20px}.word-list small{font-weight:400;font-size:13px;color:#68725f}.word-list summary{min-height:44px;padding:10px 0;cursor:pointer}.word-actions{margin-top:12px}.word-actions a{display:inline-flex;align-items:center;min-height:44px}.import-panel{border:1px solid #dfe5d9;background:#fff;border-radius:10px;padding:16px;min-width:0}.subtitle-import{font-size:14px;line-height:1.7;min-width:0}.subtitle-import label{display:block;font-weight:600;margin:12px 0}.subtitle-import input{width:100%;padding:0;border:0}.subtitle-import input::file-selector-button{min-height:44px;padding:8px;border:1px solid #becab3;border-radius:6px;background:#f1f4eb;color:#314d3d;font:inherit}.subtitle-import p{overflow-wrap:anywhere}.subtitle-import>button{width:100%;background:#30513d;color:#fff}.subtitle-preview{max-height:160px;overflow:auto;padding:12px;background:#f0f4ea;white-space:pre-wrap;overflow-wrap:anywhere}.login-help{font-size:12px}.login-help code{display:block;overflow-wrap:anywhere}.login-help summary{padding:12px 0;min-height:44px}@media (max-height:500px) and (orientation:landscape){.watch-screen{display:grid;grid-template-columns:1fr 1fr;gap:8px}.player-frame{height:calc(100dvh - var(--nav-height) - 64px);min-height:0}.learning-panel,.learning-panel.has-explanation{height:100%;margin:0;border-radius:0}.player-controls{gap:4px;padding:6px}.player-controls button{padding:8px;font-size:12px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}.input-page{padding-top:32px}.eyebrow{font-size:12px;letter-spacing:.08em;color:#687d5a;margin:0 0 8px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.page-heading h1,.input-page h1{margin:0}.page-description{color:#66705f;margin:12px 0 24px}.video-library{list-style:none;padding:0;margin:24px 0;display:grid;gap:16px}.video-card{width:100%;display:flex;align-items:center;text-align:left;gap:16px;padding:12px;border-radius:16px;box-shadow:0 3px 14px #25332908;overflow:hidden}.video-card:hover{border-color:#789565;background:#fbfcf8}.video-card img{width:36%;max-width:200px;aspect-ratio:16/9;object-fit:cover;border-radius:9px;background:#eaf0e3}.video-card-copy{display:flex;flex-direction:column;gap:12px;min-width:0}.video-card-copy strong{font-size:16px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}.video-card-copy>span{font-size:12px;color:#687d5a}.library-empty{padding:32px 24px;border:1px solid #dfe5d9;border-radius:16px;background:#fff;text-align:center;margin-top:24px}.library-empty h2{font-size:19px;line-height:1.6}.library-empty p{color:#66705f}.watch-header{display:flex;align-items:center;gap:8px;flex-shrink:0;padding:4px max(8px,env(safe-area-inset-right)) 4px max(8px,env(safe-area-inset-left));padding-top:max(4px,env(safe-area-inset-top));border-bottom:1px solid #dfe5da;background:#fff}.watch-header button{flex-shrink:0;font-size:14px}.watch-header>span{font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#66705f}.player-frame{height:auto;aspect-ratio:16/9;max-height:34dvh;min-height:0}.player-frame>#youtube-player{position:absolute;top:0;right:0;bottom:0;left:0}.player-controls{justify-content:center;padding:8px 12px 0}.player-controls .playback-toggle{min-height:56px;width:192px;font-size:18px;font-weight:600;border-radius:14px}.learning-panel,.learning-panel.has-explanation{flex:1;height:auto;margin-top:8px}.caption-list{padding-bottom:min(30dvh,180px)}@media (max-height:500px) and (orientation:landscape){.watch-screen{grid-template-rows:auto minmax(0,1fr)}.watch-header{grid-column:1/-1}.player-frame{height:calc(100dvh - var(--nav-height) - 128px);max-height:none;aspect-ratio:auto}.learning-panel,.learning-panel.has-explanation{height:100%;margin:0}.player-controls .playback-toggle{min-height:48px;font-size:16px}}