:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--page:#10120f;--surface:#1a1d18;--surface-soft:#20241d;--ink:#f3f1e8;--muted:#9ca091;--line:#ffffff1a;--accent:#d8f273;--accent-ink:#18200b}*{box-sizing:border-box}html{background:var(--page);overflow-x:hidden}body{min-width:320px;min-height:100dvh;color:var(--ink);background:var(--page);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;overflow-x:hidden}body:before{content:"";z-index:0;pointer-events:none;background:radial-gradient(at 18% 100%,#6f894829,#0000 68%);height:42dvh;position:fixed;bottom:0;left:0;right:0}button,input,select{font:inherit}button{-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round}.ambient{pointer-events:none;opacity:.14;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.08'/%3E%3C/svg%3E");position:fixed;inset:0}.app-shell{z-index:1;width:min(1080px,100%);min-height:100dvh;margin:auto;padding:18px 18px 110px;position:relative}.app-shell:has(.study-view.is-active){width:100%;padding:0}.topbar{justify-content:space-between;align-items:center;height:48px;display:flex}.brand{color:var(--ink);letter-spacing:.01em;cursor:pointer;background:0 0;border:0;align-items:center;gap:10px;padding:0;font-size:17px;font-weight:700;line-height:1;display:inline-flex}.brand-mark{width:34px;height:34px;color:var(--accent);place-items:center;display:grid}.brand-mark img{object-fit:contain;width:34px;height:34px;display:block}.streak-pill{color:var(--muted);align-items:center;gap:6px;font-size:12px;display:flex}.streak-pill span:first-child{color:var(--accent)}.view,.study-view{display:none}.view.is-active,.study-view.is-active{display:block}.home-view{width:min(680px,100%);margin:auto}.home-intro{padding:42px 2px 30px}.date-label,.section-label{color:var(--accent);letter-spacing:.14em;text-transform:uppercase;margin:0 0 10px;font-size:10px;font-weight:700}.home-intro h1,.page-heading h1{letter-spacing:-.035em;margin:0;font:400 clamp(36px,10vw,58px)/1.08 Georgia,Times New Roman,serif}.home-intro>p:last-child,.page-heading p{color:var(--muted);margin:14px 0 0;font-size:14px;line-height:1.7}.daily-card{background:linear-gradient(145deg,#2b3222eb,#191c17f0);border:1px solid #d8f2732e;border-radius:26px;padding:24px;box-shadow:0 24px 60px #00000040}.daily-card-head,.section-head{justify-content:space-between;align-items:flex-start;gap:18px;display:flex}.daily-card h2,.home-section h2,.settings-card h2{margin:0;font-size:16px;font-weight:600}.time-estimate,.section-head span{color:var(--muted);font-size:12px}.task-counts{align-items:center;gap:26px;margin:30px 0 26px;display:flex}.task-counts div{flex-direction:column;gap:4px;display:flex}.task-counts strong{font:400 42px/1 Georgia,serif}.task-counts span{color:var(--muted);font-size:12px}.task-counts i{background:var(--line);width:1px;height:38px}.start-button{width:100%;min-height:56px;color:var(--accent-ink);background:var(--accent);cursor:pointer;border:0;border-radius:17px;justify-content:center;align-items:center;gap:10px;font-weight:700;display:flex}.start-button svg{width:18px}.start-button:disabled{color:var(--muted);cursor:default;background:#ffffff12}.review-today-button{border:1px solid var(--line);width:100%;min-height:46px;color:var(--ink);cursor:pointer;background:#ffffff09;border-radius:15px;margin-top:10px;font-weight:650}.review-today-button:disabled{color:var(--muted);opacity:.5;cursor:default}.home-section{margin-top:32px;padding:0 2px}.home-progress{background:#ffffff14;border-radius:999px;height:6px;margin-top:18px;overflow:hidden}.home-progress span{border-radius:inherit;background:var(--accent);width:0;height:100%;transition:width .3s;display:block}.section-note{color:#73786c;margin:12px 0 0;font-size:12px;line-height:1.6}.memory-grid{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:16px;display:grid}.memory-grid div{border:1px solid var(--line);background:#ffffff06;border-radius:17px;min-width:0;padding:18px 14px}.memory-grid strong,.memory-grid span{display:block}.memory-grid strong{font:400 25px Georgia,serif}.memory-grid span{color:var(--muted);margin-top:7px;font-size:11px}.page-heading{padding:42px 2px 28px}.book-view,.profile-view{width:min(720px,100%);margin:auto}.search-box{border:1px solid var(--line);background:#ffffff09;border-radius:16px;align-items:center;gap:10px;height:52px;padding:0 16px;display:flex}.search-box svg{width:19px;color:var(--muted)}.search-box input{min-width:0;color:var(--ink);background:0 0;border:0;outline:0;flex:1}.search-box input::placeholder{color:#6f7369}.word-list{border-top:1px solid var(--line);margin-top:16px}.word-row{border:0;border-bottom:1px solid var(--line);width:100%;color:var(--ink);text-align:left;cursor:pointer;background:0 0;justify-content:space-between;align-items:center;gap:20px;padding:17px 2px;display:flex}.word-row>span{min-width:0}.word-row strong,.word-row small{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.word-row strong{font:400 20px Georgia,serif}.word-row small{max-width:55vw;color:var(--muted);margin-top:5px;font-size:11px}.word-status{color:var(--muted);background:#ffffff0d;border-radius:999px;flex:none;padding:6px 9px;font-size:10px;font-style:normal}.word-status.review{color:#e8dba1;background:#e8dba117}.word-status.mastered{color:var(--accent);background:#d8f27317}.settings-list{gap:10px;display:grid}.settings-card{border:1px solid var(--line);background:#ffffff08;border-radius:20px;justify-content:space-between;align-items:center;gap:20px;padding:20px;display:flex}.settings-card-stack{flex-direction:column;align-items:stretch;gap:16px}.settings-card p{color:var(--muted);margin:7px 0 0;font-size:12px;line-height:1.5}.settings-card select{border:1px solid var(--line);min-width:108px;color:var(--ink);background:var(--surface);border-radius:12px;padding:10px}.word-book-pill{color:var(--accent);background:#d8f27312;border:1px solid #d8f2733d;border-radius:999px;flex:none;padding:9px 12px;font-size:12px;font-weight:700}.word-list-options{grid-template-columns:repeat(2,1fr);gap:10px;display:grid}.word-list-options label{border:1px solid var(--line);min-height:48px;color:var(--muted);cursor:pointer;background:#ffffff06;border-radius:14px;align-items:center;gap:10px;padding:0 14px;display:flex}.word-list-options label:has(input:checked){color:var(--ink);background:#d8f27312;border-color:#d8f27361}.word-list-options input{width:16px;height:16px;accent-color:var(--accent);margin:0}.profile-stats{grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px;display:grid}.profile-stats div{border:1px solid var(--line);border-radius:18px;padding:20px 14px}.profile-stats span,.profile-stats strong{display:block}.profile-stats span{color:var(--muted);font-size:11px}.profile-stats strong{margin-top:10px;font:400 28px Georgia,serif}.bottom-nav{z-index:20;left:50%;bottom:max(12px, env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#191c17eb;border:1px solid #ffffff1a;border-radius:22px;grid-template-columns:repeat(3,1fr);width:min(360px,100% - 28px);height:66px;padding:7px;display:grid;position:fixed;transform:translate(-50%);box-shadow:0 16px 45px #0006}.bottom-nav[hidden]{display:none}.bottom-nav button{color:#777b70;cursor:pointer;background:0 0;border:0;border-radius:16px;place-items:center;font-size:12px;display:grid}.bottom-nav button.is-active{color:var(--accent);background:#d8f27314}.study-view{background:0 0;padding-bottom:0}.study-view.is-active{overscroll-behavior:contain;width:100vw;min-height:100dvh;overflow:hidden}.study-header{z-index:25;pointer-events:none;height:2px;margin:0;display:block;position:fixed;top:0;left:0;right:0}.back-button{border:1px solid var(--line);color:var(--ink);cursor:pointer;background:#ffffff0a;border-radius:50%;place-items:center;display:none}.back-button svg{width:19px}.study-header>span{display:none}.study-progress{background:#ffffff14;border-radius:0;height:2px;position:absolute;top:0;left:0;right:0;overflow:hidden}.study-progress span{background:var(--accent);width:0;height:100%;transition:width .3s;display:block}.study-view.is-book-session .study-progress,.study-view.is-book-session .study-header>span{display:none}.study-layout{overscroll-behavior-y:contain;scroll-snap-type:y mandatory;scrollbar-width:none;background:0 0;width:100vw;height:100dvh;padding-top:0;position:relative;overflow:hidden auto}.study-layout::-webkit-scrollbar{display:none}.study-page{width:100vw;height:100dvh;min-height:100dvh;padding:18px 28px max(36px, env(safe-area-inset-bottom));scroll-snap-align:start;scroll-snap-stop:always;background:0 0;align-content:start;gap:18px;display:grid;overflow:visible}.word-page-preview{width:100vw;height:100dvh;min-height:100dvh;color:var(--ink);pointer-events:none;background:0 0}.word-page-preview .video-stage,.word-page-preview .word-panel{justify-self:center}.video-stage{isolation:isolate;touch-action:pan-y;justify-content:center;justify-self:center;width:min(100%,480px);height:min(512px,80dvh - 134.4px);display:flex;position:relative;overflow:visible}.video-frame,.smart-video,.native-video{width:100%;height:100%}.video-frame{border:1px solid var(--line);background:#090a09;border-radius:24px;transition:width .18s;position:relative;overflow:hidden;box-shadow:0 28px 70px #00000059}.video-frame.is-douyin-iframe{width:min(100%,326px)}.video-slot{opacity:0;pointer-events:none;will-change:transform;position:absolute;inset:0}.video-slot.is-active{opacity:1;pointer-events:auto}.video-slot.is-drag-preview{opacity:1;pointer-events:none}.native-video{object-fit:contain;object-position:center;background:#090a09;border:0;animation:.18s ease-out video-in;display:block}.video-cover-placeholder{background-color:#090a09;background-position:50%;background-repeat:no-repeat;background-size:contain;width:100%;height:100%}.smart-video{position:relative}.video-cover-overlay{z-index:2;pointer-events:none;opacity:1;transition:opacity .18s;position:absolute;inset:0}.video-cover-overlay.is-hidden{opacity:0}.video-stage.is-video-dragging,.video-frame.is-video-dragging{overflow:visible}.video-frame.is-video-dragging{box-shadow:none;background:0 0;border-color:#0000}.video-stage.is-video-dragging .video-slot{border:1px solid var(--line);background:#090a09;border-radius:24px;overflow:hidden;box-shadow:0 28px 70px #00000059}.video-stage.is-carousel,.video-frame.is-carousel{overflow:visible}.video-stage.is-carousel{box-shadow:none;background:0 0;border-color:#0000}.video-frame.is-carousel{background:0 0}.video-carousel{pointer-events:none;grid-template-columns:100vw 100vw;width:200vw;height:100%;display:grid;position:absolute;top:0;left:50%}.video-carousel.is-next{animation:.26s cubic-bezier(.22,.8,.22,1) forwards carousel-next}.video-carousel.is-prev{animation:.26s cubic-bezier(.22,.8,.22,1) forwards carousel-prev}.video-slide{justify-content:center;min-width:0;height:100%;display:flex}.video-slide>.native-video,.video-slide>.video-error{border:1px solid var(--line);border-radius:24px;width:min(100vw - 36px,480px);height:100%;box-shadow:0 28px 70px #00000059}@keyframes carousel-next{0%{transform:translate(-50vw)}to{transform:translate(-150vw)}}@keyframes carousel-prev{0%{transform:translate(-150vw)}to{transform:translate(-50vw)}}@keyframes video-in{0%{opacity:.35}to{opacity:1}}.video-error{width:100%;height:100%;color:var(--accent);background:var(--surface);text-align:center;place-items:center;padding:24px;font-size:12px;text-decoration:none;display:grid}.douyin-iframe{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;background:#000;border:0;width:100%;height:100%;display:block;overflow:hidden}.video-gesture-layer{z-index:2;pointer-events:none;background:0 0;position:absolute;inset:0}.video-gesture-top{pointer-events:none;touch-action:pan-x;height:104px;position:absolute;top:0;left:0;right:0}.video-stage.has-multiple-videos .video-gesture-top{pointer-events:auto}.video-dots{z-index:3;gap:7px;display:flex;position:absolute;top:16px;left:50%;transform:translate(-50%)}.video-dot{background:#ffffff59;border:0;border-radius:9px;width:6px;height:6px;padding:0;transition:all .18s}.video-dot.is-active{background:var(--accent);width:18px}.empty-video{background:radial-gradient(circle at 50% 30%,#d8f2732e,#0000 28%),linear-gradient(145deg,#303a29,#171a16 65%);flex-direction:column;justify-content:flex-end;gap:9px;height:100%;padding:28px 22px;display:flex;position:relative;overflow:hidden}.empty-letter{color:#ffffff0e;place-items:center;font:200 180px Georgia,serif;display:grid;position:absolute;inset:0}.empty-video strong,.empty-video p{position:relative}.empty-video strong{font-size:15px}.empty-video p{color:var(--muted);margin:0;font-size:12px}.word-panel{flex-direction:column;justify-content:flex-start;justify-self:center;width:min(620px,100%);min-height:0;display:flex}.word-heading{justify-content:space-between;align-items:center;gap:16px;display:flex}.word-heading h1{overflow-wrap:anywhere;letter-spacing:-.045em;margin:0;font:400 clamp(45px,13vw,80px)/.98 Georgia,serif}.phonetic{min-height:19px;color:var(--accent);flex-wrap:wrap;gap:9px;margin:12px 0 0;font:13px Georgia,serif;display:flex}.phonetic-button{min-height:24px;color:var(--accent);font:inherit;cursor:pointer;background:0 0;border:0;align-items:center;gap:5px;padding:0;display:inline-flex}.phonetic-button svg{opacity:.9;width:17px;height:17px}.answer-panel{filter:blur(9px);opacity:0;-webkit-user-select:none;user-select:none;min-height:0;max-height:0;margin:0;padding:0;transition:all .2s;overflow:hidden}.answer-panel.is-revealed{filter:none;opacity:1;-webkit-user-select:auto;user-select:auto;max-height:none;margin-top:16px;padding-top:0;overflow:visible}.translation{color:#d4d5cd;margin:0;font-size:16px;line-height:1.7}.answer-tabs{background:#ffffff09;border:1px solid #ffffff14;border-radius:999px;gap:6px;margin-top:14px;padding:4px;display:inline-flex}.answer-tabs button{min-height:30px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:999px;padding:0 13px;font-size:12px;font-weight:700}.answer-tabs button.is-active{color:var(--accent-ink);background:var(--accent)}.video-context{gap:10px;margin-top:14px;display:grid}.video-context-block{background:#ffffff09;border:1px solid #ffffff14;border-radius:14px;padding:12px 13px}.video-context-block span{color:var(--accent);letter-spacing:.08em;margin-bottom:6px;font-size:10px;font-weight:700;display:block}.video-context-block p{color:#e2e5db;margin:0;font-size:13px;line-height:1.65}.dictionary-panel{gap:12px;margin-top:14px;display:grid}.dictionary-empty{color:var(--muted);margin:0;font-size:13px;line-height:1.65}.dictionary-phonetics{flex-wrap:wrap;gap:8px;display:flex}.dictionary-phonetics span{color:var(--accent);background:#d8f2730e;border:1px solid #d8f2732e;border-radius:999px;padding:7px 10px;font:13px Georgia,serif}.dictionary-meanings{gap:10px;display:grid}.dictionary-meaning{background:0 0;border:0;border-top:1px solid #ffffff17;border-radius:0;padding:14px 0}.dictionary-meaning:first-child{border-top:0;padding-top:0}.dictionary-meaning>span{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px;font-size:10px;font-weight:700;display:block}.dictionary-meaning ol{color:#e2e5db;gap:9px;margin:0;padding-left:18px;display:grid}.dictionary-meaning p{margin:0;font-size:13px;line-height:1.55}.dictionary-meaning em{color:var(--muted);margin-top:4px;font-size:12px;font-style:normal;line-height:1.5;display:block}.dictionary-links{flex-wrap:wrap;gap:8px;display:flex}.dictionary-links a{color:var(--muted);text-underline-offset:4px;background:0 0;border:0;border-radius:0;padding:6px 0;font-size:12px;text-decoration:underline}.recall-actions{margin-top:18px}.reveal-button{border:1px solid var(--accent);width:100%;min-height:54px;color:var(--accent-ink);background:var(--accent);cursor:pointer;border-radius:16px;font-weight:700}.rating-actions{grid-template-columns:repeat(4,1fr);gap:7px;margin-top:10px;display:grid}.rating-actions.is-visible{display:grid}.rating-actions button{border:1px solid var(--line);min-width:0;min-height:60px;color:var(--ink);cursor:pointer;background:#ffffff09 padding-box padding-box;border-radius:16px;padding:8px 3px;overflow:hidden}.rating-actions strong,.rating-actions span{display:block}.rating-actions strong{font-size:12px}.rating-actions span{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin-top:4px;font-size:8px;overflow:hidden}.toast{z-index:30;border:1px solid var(--line);max-width:calc(100% - 32px);color:var(--ink);opacity:0;pointer-events:none;background:#191c17f5;border-radius:999px;padding:10px 14px;font-size:12px;transition:all .18s;position:fixed;bottom:96px;left:50%;transform:translate(-50%,16px);box-shadow:0 12px 30px #0000004d}.toast.is-visible{opacity:1;transform:translate(-50%)}.debug-mode-button{z-index:40;min-height:32px;color:var(--accent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);cursor:pointer;background:#0a0c0ac7;border:1px solid #d8f27347;border-radius:999px;padding:0 11px;font-size:11px;position:fixed;bottom:14px;left:14px;box-shadow:0 10px 24px #0000004d}.seo-snapshot{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}@media (min-width:820px){.app-shell{padding:24px 34px 70px}.bottom-nav{width:auto;height:auto;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border:0;border-radius:0;gap:28px;padding:0;display:flex;inset:34px 34px auto auto;transform:none}.bottom-nav button{color:#f3f1e86b;letter-spacing:.03em;background:0 0;border-radius:0;padding:0;font-size:13px;display:block}.bottom-nav button.is-active{color:var(--accent);background:0 0}.bottom-nav button:hover{color:#f3f1e8c7}.bottom-nav button.is-active:hover{color:var(--accent)}.streak-pill{display:none}.home-intro,.page-heading{padding-top:80px}.study-page{grid-template-columns:minmax(320px,480px) minmax(390px,540px);place-content:center;align-items:center;gap:clamp(44px,6vw,80px);height:100dvh;min-height:100dvh;padding:20px 34px}.word-page-preview{height:100dvh;min-height:100dvh}.video-stage{width:min(100%,480px);height:min(640px,100dvh - 150px)}.video-dots{flex-direction:row;align-items:center;gap:9px;top:auto;bottom:-28px;right:50%;transform:translate(50%)}.video-dot{cursor:pointer;background:#ffffff52;width:7px;height:7px}.video-dot.is-active{background:var(--accent);width:20px}.word-panel{width:min(540px,100%);min-height:0;padding:28px 0}.rating-actions{gap:10px;margin-top:12px}.rating-actions button{min-height:70px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}