@font-face{font-family:Recharge;src:local('Avenir Next'),local('Avenir'),local('Century Gothic');font-display:swap}
:root{--bg:#122522;--surface:#1d322d;--paper:#f5f2e9;--text:#f3f2e9;--muted:#99aaa0;--ink:#20342c;--accent:#c6ef9b;--line:rgba(224,238,218,.12);--hot:#d6a780;--know:#b7cdb8;--energy:#e8cb88;--space-xs:6px;--space-sm:12px;--space-md:24px;--space-lg:40px;--space-xl:72px;--shadow-sm:0 4px 20px #061e1b1a;--shadow-lg:0 24px 70px #06130f38;--font-body:Recharge,'PingFang SC','Microsoft YaHei',sans-serif;--font-display:'Songti SC','Noto Serif CJK SC','STSong',serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:14px;-webkit-font-smoothing:antialiased;background-image:radial-gradient(ellipse at 50% -30%,#30503b70,transparent 65%)}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;border:0;cursor:pointer;background:none;color:inherit}button:disabled{opacity:.35;cursor:default}a{color:inherit;text-decoration:none}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,article:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button:focus:not(:focus-visible),article:focus:not(:focus-visible){outline:none}button:hover:not(:disabled){filter:brightness(1.06)}[hidden]{display:none!important}.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}.shell{width:min(1240px,calc(100% - 112px));margin-inline:auto}.site-header{height:116px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:600;letter-spacing:1px}.brand small{display:block;font-size:8px;letter-spacing:2.2px;font-weight:500;color:var(--muted);margin-top:7px}.brand-mark{height:42px;width:42px;background:var(--accent);color:var(--bg);border-radius:12px;display:grid;place-items:center;transform:rotate(-5deg)}.brand-mark .icon{width:26px;height:26px;fill:currentColor;stroke-width:0}.desktop-nav{display:flex;gap:40px;height:100%;align-items:center}.nav-link{position:relative;height:100%;font-size:13px;color:var(--muted);letter-spacing:1px;padding:0 3px}.nav-link.active{color:var(--text)}.nav-link.active:after{content:'';position:absolute;bottom:-1px;left:calc(50% - 10px);height:3px;width:20px;border-radius:2px;background:var(--accent)}.header-end{display:flex;align-items:center;gap:22px}.streak-pill{display:flex;gap:7px;align-items:center;color:var(--accent);font-size:12px}.streak-pill .icon{width:17px;height:17px;fill:currentColor;stroke-width:0}.streak-pill #header-streak{font-size:20px;font-weight:600}.icon-button{display:grid;place-items:center;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(270px,1fr) minmax(460px,568px);gap:clamp(60px,7.5vw,120px);padding-top:56px;padding-bottom:48px;align-items:start}.overview{padding-top:18px;max-width:440px}.edition{display:flex;align-items:center;gap:9px;color:#a9b5a5;font-size:10px;letter-spacing:1.5px}.live-dot{height:5px;width:5px;border-radius:50%;background:var(--accent)}.edition-line{height:1px;width:42px;background:var(--line);margin-left:5px}h1{font-family:var(--font-display);font-size:clamp(38px,3.65vw,54px);line-height:1.4;font-weight:500;letter-spacing:2px;margin:27px 0 19px}h1 span{color:var(--accent)}.intro-copy{font-size:13px;line-height:2.15;color:var(--muted);margin:0;letter-spacing:.6px}.daily-status{display:flex;align-items:center;gap:20px;margin-top:39px;padding:26px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.battery-visual{position:relative;display:flex;align-items:center;gap:3px;width:57px;height:32px;border:1px solid #b6cc9c73;border-radius:7px;padding:5px;color:var(--accent)}.battery-visual:after{position:absolute;content:'';height:12px;width:3px;right:-5px;border-radius:0 2px 2px 0;background:#b6cc9c73}.battery-visual>span{width:9px;height:20px;background:#c6ef9b1c;border-radius:2px}.battery-visual .icon{position:absolute;left:21px;top:6px;height:19px;width:14px;fill:var(--accent);stroke-width:0}.battery-visual>span:first-child{background:var(--accent);opacity:.3}.mini-label{color:var(--muted);font-size:10px;letter-spacing:1px}.daily-status p{margin:5px 0 0;display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}.daily-status strong{font-size:24px;line-height:1}.daily-status p>span{font-size:11px;color:var(--muted)}.daily-status em{font-style:normal;font-size:10px;color:#94a48e;margin-left:8px}.topic-guide{margin-top:31px}.topic-guide>.mini-label{display:block;margin-bottom:14px}.topic-guide>button{display:flex;align-items:center;gap:13px;padding:13px 0;width:100%;text-align:left}.topic-icon{width:39px;height:39px;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px}.topic-icon.hot{color:var(--hot)}.topic-icon.know{color:var(--know)}.topic-icon.energy{color:var(--energy)}.topic-guide strong{font-size:12px;font-weight:500;letter-spacing:.5px}.topic-guide small{display:block;color:var(--muted);font-size:10px;margin-top:6px}.topic-count{margin-left:auto;color:#91a48e;font-size:11px}.topic-guide>button>.icon{height:16px;width:16px;margin-left:5px;color:#6d8775}.quiet-note{margin-top:36px;font-size:10px;color:#718b7a}.quiet-note>span{display:block;margin-bottom:9px}.quiet-note button{display:flex;align-items:center;gap:5px;padding:6px 0;color:#9eb29a;font-size:10px}.quiet-note .icon{height:12px;width:12px}.reader{min-width:0}.reader-toolbar{height:48px;margin-bottom:17px;display:flex;align-items:flex-start;justify-content:space-between;gap:10px}.category-tabs{display:flex;gap:4px;background:#0c1d183d;border:1px solid var(--line);border-radius:24px;padding:4px}.category-tabs button{position:relative;min-width:64px;padding:9px 13px;font-size:12px;border-radius:20px;color:#aab8aa;transition:background .2s,color .2s;white-space:nowrap}.category-tabs button[aria-selected=true]{background:var(--accent);color:var(--bg);font-weight:600}.reader-caption{font-size:10px;color:var(--muted);padding-top:15px;letter-spacing:.5px}.deck{min-height:590px;perspective:1800px}.learning-card{width:100%;height:590px;touch-action:pan-y;cursor:pointer;border-radius:20px;isolation:isolate}.card-inner{position:relative;height:100%;width:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.22,.75,.2,1)}.learning-card.is-flipped .card-inner{transform:rotateY(180deg)}.card-face{position:absolute;inset:0;border-radius:20px;overflow:hidden;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:var(--shadow-lg)}.card-front{background:var(--paper);color:var(--ink);display:flex;flex-direction:column;transform:rotateY(0deg);z-index:2}.card-art{position:relative;height:258px;flex-shrink:0;background:#1b3632;overflow:hidden;border-radius:20px 20px 0 0}.card-art>img{width:100%;height:100%;object-fit:cover;object-position:center 48%;display:block}.card-art:after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,#071f1940,transparent 40%,#081b1844);pointer-events:none}.art-grain{position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(0deg,#fff1 0px,transparent 1px,transparent 3px);opacity:.09}.card-type{position:absolute;top:22px;left:24px;z-index:1;display:flex;align-items:center;gap:6px;border:1px solid #f2f2df33;background:#102c2766;backdrop-filter:blur(12px);border-radius:18px;padding:7px 11px;font-size:10px;color:#f0f0df;letter-spacing:1px}.card-type .icon{width:13px;height:13px}.save-button{position:absolute;right:21px;top:19px;z-index:3;width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:#102c2755;backdrop-filter:blur(12px);border:1px solid #f2f2df33;color:#f0f0df}.save-button[aria-pressed=true]{background:var(--accent);color:var(--bg)}.save-button[aria-pressed=true] .icon{fill:currentColor}.save-button .icon{height:17px;width:17px}.art-caption{position:absolute;bottom:17px;left:25px;color:#fffff593;font-size:7px;letter-spacing:2px;z-index:1}.art-fallback{position:absolute;inset:0;display:grid;place-items:center;background:radial-gradient(ellipse at center,#42634a,#18332d);color:var(--accent)}.art-fallback .icon{width:80px;height:80px;stroke-width:.6}.card-copy{padding:26px 30px 23px;flex:1;display:flex;flex-direction:column;min-height:0}.card-meta{display:flex;align-items:center;justify-content:space-between;font-size:8px;letter-spacing:1.4px;color:#758075}.card-meta>span:last-child{font-size:9px;letter-spacing:.5px}.card-copy h2{font-family:var(--font-display);font-size:27px;font-weight:600;line-height:1.4;letter-spacing:.5px;margin:15px 0 7px}.card-sub{font-size:11px;color:#85907c;margin:0 0 15px;letter-spacing:.3px}.card-body{font-size:13px;line-height:1.95;letter-spacing:.25px;margin:0;overflow-y:auto;min-height:40px;scrollbar-width:thin;overscroll-behavior:contain}.card-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #20342c15;padding-top:15px;gap:12px;min-height:44px}.source-links{min-width:0;font-size:8px;color:#86917e;line-height:1.6}.source-links a{display:inline-flex;align-items:center;gap:4px;max-width:240px}.source-links a:hover{text-decoration:underline}.source-links .icon{height:11px;width:11px}.flip-link{display:flex;align-items:center;gap:6px;color:#4c6542;font-size:10px;white-space:nowrap;padding:8px 0}.flip-link .icon{width:15px;height:15px}.card-back{transform:rotateY(180deg);background:#dbe5cb;color:#263c2b;padding:32px;display:flex;flex-direction:column;z-index:1}.back-top{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#5f7751}.back-top>span:first-child{display:flex;align-items:center;gap:6px}.back-top .icon{height:16px;width:16px}.back-top>span:last-child{font-size:15px}.back-watermark{position:absolute;top:50px;right:30px;font-family:Georgia,serif;font-size:210px;line-height:1;color:#b4c6a36b}.back-content{margin:auto 0;position:relative;padding:28px 0}.back-content .mini-label{font-size:8px;color:#68845d;letter-spacing:2px}.back-content h2{font-family:var(--font-display);font-size:33px;line-height:1.5;font-weight:500;margin:24px 0}.back-content p{font-size:18px;line-height:2;max-height:280px;overflow-y:auto}.back-tags{display:flex;gap:7px;margin-top:27px}.back-tags span{font-size:9px;border:1px solid #59774c33;padding:6px 10px;border-radius:20px;color:#5c7550}.back-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #59774c26;padding-top:18px;gap:10px}.back-bottom span,.back-bottom button{font-size:9px;display:flex;gap:5px;align-items:center}.back-bottom span{color:#6c865e}.back-bottom .icon{width:13px;height:13px}.deck-navigation{display:flex;align-items:center;gap:24px;margin-top:25px}.round-button{height:43px;width:43px;border:1px solid #bbd4ae40;display:grid;place-items:center;border-radius:50%}.arrow-left{transform:rotate(180deg)}.next-button{display:flex;align-items:center;justify-content:center;gap:15px;border-radius:24px;height:43px;padding:0 22px;background:var(--accent);color:#213b26;font-size:12px;min-width:116px;font-weight:500}.next-button .icon{width:17px;height:17px}.deck-position{flex:1;max-width:260px;margin-right:auto}.deck-position>span{display:block;font-size:12px;letter-spacing:2px;margin-bottom:9px}.deck-position i{font-style:normal;color:#708b78;font-size:10px}.progress-track{height:2px;background:#acc59426;border-radius:2px;overflow:hidden}.progress-track>span{height:100%;display:block;width:0;background:var(--accent);transition:width .3s}.reader-hint{display:flex;align-items:center;justify-content:center;gap:7px;color:#78927e;font-size:9px;letter-spacing:.4px;margin:20px 0 0}.reader-hint .icon{height:13px;width:13px}.site-footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-block:22px;font-size:9px;color:#6f8877;letter-spacing:.5px}.site-footer i{font-style:normal;margin:0 10px}.mobile-nav{display:none}.app-dialog{background:var(--paper);color:var(--ink);padding:0;border:1px solid #ced7c5;border-radius:24px;width:min(480px,calc(100% - 32px));max-height:calc(100dvh - 64px);box-shadow:0 30px 150px #020e0be0;overflow:auto;overscroll-behavior:contain}.app-dialog::backdrop{background:#041710ad;backdrop-filter:blur(12px)}.dialog-shell{position:relative;padding:38px 32px 28px}.dialog-close{position:absolute;top:16px;right:16px;color:#607254;border-color:#29432d1a;z-index:2;width:34px;height:34px}.dialog-close .icon{width:16px;height:16px}.dialog-eyebrow{display:block;color:#789168;font-size:9px;letter-spacing:2px;margin-bottom:16px}.dialog-shell h2{font-family:var(--font-display);font-size:31px;line-height:1.5;margin:12px 0 16px;font-weight:500}.dialog-shell p{font-size:13px;line-height:1.9;color:#738169}.dialog-symbol{background:#dce8ca;border-radius:20px;width:64px;height:64px;display:grid;place-items:center;margin-bottom:24px;color:#537148}.dialog-symbol .icon{height:30px;width:30px}.feature-list{display:grid;gap:20px;margin:29px 0}.feature-item{display:flex;align-items:center;gap:15px;font-size:12px}.feature-item>.icon{height:20px;width:20px;color:#678259}.feature-item strong{display:block;font-weight:500;margin-bottom:5px}.feature-item small{font-size:10px;color:#8a9580}.primary,.secondary{display:flex;justify-content:center;align-items:center;gap:10px;min-height:46px;padding:12px 20px;border-radius:12px;font-size:12px;width:100%;font-weight:500}.primary{background:#29412f;color:#e6efd9}.secondary{background:#e8eadf;color:#5b7150;margin-top:10px}.primary .icon,.secondary .icon{height:17px;width:17px}.fine-print{font-size:10px!important;color:#8c967f!important;margin-top:17px!important;line-height:1.8!important}.level-badge{display:inline-flex;align-items:center;gap:7px;color:#5e794d;background:#e4e9d7;font-size:10px;padding:7px 12px;border-radius:20px}.dashboard-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;padding-block:25px;border-bottom:1px solid #667d4a20;margin-bottom:25px}.dashboard-stats strong{display:block;font-size:29px;font-weight:500}.dashboard-stats span{display:block;font-size:10px;color:#889477;margin-top:7px}.section-label{font-size:11px;font-weight:500;display:flex;justify-content:space-between;align-items:center;margin:24px 0 14px}.section-label button{color:#82956e;font-size:10px;padding:5px 0}.category-stat{margin-top:15px;display:grid;grid-template-columns:38px 1fr 32px;gap:12px;align-items:center;font-size:10px;color:#7b8b6c}.category-stat>div{height:5px;background:#e2e8d8;border-radius:4px;overflow:hidden}.category-stat i{display:block;height:100%;background:#859c71;border-radius:4px}.category-stat b{font-weight:400;text-align:right}.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}.tag-cloud button{font-size:10px;background:#e8ecde;color:#6a8057;border-radius:20px;padding:9px 13px;max-width:100%;text-align:left}.clear-button{font-size:9px;text-decoration:underline;text-underline-offset:4px;color:#9c9e8d;padding:10px 0;margin-top:15px}.favorite-list{display:grid;gap:10px;margin-top:25px}.favorite-row{display:flex;align-items:center;text-align:left;gap:12px;padding:14px;background:#e9ede0;border-radius:12px;width:100%}.favorite-row>span{min-width:0;flex:1}.favorite-row strong{display:block;font-size:12px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.favorite-row small{display:block;font-size:9px;color:#8a967c;margin-top:6px}.favorite-row>.icon{width:16px;height:16px;color:#8a9f77}.saved-body{font-size:14px!important;color:#4c6044!important;margin:20px 0!important}.saved-tip{background:#e5ebd9;padding:20px;border-radius:14px;font-size:13px;line-height:2;color:#5d754b;margin:20px 0}.toast{position:fixed;bottom:35px;left:50%;transform:translate(-50%,20px);background:#e5efd6;color:#2b432f;box-shadow:0 4px 35px #00180c44;border:1px solid #f4faee55;border-radius:12px;padding:13px 21px;font-size:12px;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;max-width:calc(100% - 32px);text-align:center;line-height:1.6}.toast.visible{opacity:1;transform:translate(-50%,0)}.empty-state{min-height:590px;background:#1d322d;border:1px solid var(--line);border-radius:20px;padding:70px 30px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center}.empty-state>.icon{width:50px;height:50px;color:var(--accent)}.empty-state h2{font-family:var(--font-display);font-size:25px;font-weight:500}.empty-state p{font-size:12px;color:var(--muted);margin-bottom:30px}.empty-state .primary{max-width:200px;background:var(--accent);color:var(--ink)}.skip-link{position:fixed;top:-100px;left:20px;z-index:100;background:var(--accent);color:var(--ink);padding:15px}.skip-link:focus{top:15px}.complete-number{font-size:72px;font-weight:400;line-height:1;margin:20px 0 5px;letter-spacing:-4px}.complete-number small{font-size:13px;letter-spacing:0;margin-left:10px;color:#7b906a}.complete-summary{display:flex;justify-content:space-between;margin:25px 0;font-size:11px;padding:16px 0;border-block:1px solid #667d4a20;color:#7b906a}.poster-wrap{background:#e1e5d7;padding:12px;border-radius:14px;margin:20px 0}.poster-wrap canvas{width:100%;height:auto;display:block;border-radius:7px}.confetti-piece{position:fixed;top:-15px;width:7px;height:14px;z-index:30;pointer-events:none;animation:fall 2.8s cubic-bezier(.15,.6,.4,1) forwards}.noscript{text-align:center;padding:20px;color:var(--accent)}@keyframes fall{to{transform:translate(var(--drift),105vh) rotate(560deg);opacity:0}}@keyframes appear{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.overview,.reader{animation:appear .6s cubic-bezier(.2,.8,.2,1) both}.reader{animation-delay:.08s}
@media(min-width:1500px){.workspace{padding-top:72px;padding-bottom:64px}.deck,.learning-card{height:630px;min-height:630px}.card-art{height:284px}.card-copy{padding:28px 34px}.card-copy h2{font-size:29px}.card-body{font-size:14px}.overview{padding-top:32px}.daily-status{margin-top:45px}}
@media(max-width:1100px){.shell{width:calc(100% - 64px)}.workspace{gap:45px;grid-template-columns:minmax(240px,1fr) minmax(390px,1.35fr)}.desktop-nav{gap:23px}.reader-caption{display:none}.category-tabs{width:100%;justify-content:space-between}.category-tabs button{flex:1;min-width:0}.card-copy h2{font-size:24px}.card-copy{padding-inline:25px}.daily-status{gap:15px}.daily-status em{display:block;width:100%;margin-left:0}.back-content h2{font-size:29px}.back-content p{font-size:17px}.site-footer{font-size:8px}}
@media(max-width:760px){body{background-image:radial-gradient(ellipse at 100% 0,#34553a55,transparent 55%);padding-bottom:calc(84px + env(safe-area-inset-bottom))}.shell{width:calc(100% - 40px)}.site-header{height:85px;border:0;gap:12px;padding-top:env(safe-area-inset-top)}.brand{font-size:17px;gap:9px;letter-spacing:.5px}.brand small{font-size:6px;letter-spacing:1.6px;margin-top:5px}.brand-mark{height:34px;width:34px;border-radius:10px}.brand-mark .icon{width:23px;height:23px}.desktop-nav,.help-button{display:none}.header-end{gap:0}.streak-pill{background:#d8edbd0c;border:1px solid var(--line);padding:7px 10px;border-radius:20px;font-size:10px;gap:4px}.streak-pill #header-streak{font-size:15px}.streak-pill .icon{height:13px;width:13px}.workspace{display:block;padding-top:9px;padding-bottom:0}.overview{padding-top:0;max-width:none}.edition{font-size:8px;letter-spacing:1px;gap:7px}.edition-line{width:24px}.overview h1{font-size:30px;line-height:1.45;letter-spacing:1px;margin:12px 0 6px}.overview h1 br{display:none}.overview h1 span{display:inline}.intro-copy{font-size:10px;line-height:1.8;letter-spacing:.25px}.intro-copy br{display:none}.daily-status,.topic-guide,.quiet-note{display:none}.reader{margin-top:25px;animation-delay:.04s}.reader-toolbar{height:43px;margin-bottom:15px}.category-tabs{border:0;background:#0c1d1850;padding:4px;border-radius:14px}.category-tabs button{border-radius:10px;font-size:11px;padding:9px 12px;min-height:36px}.deck{min-height:515px}.learning-card{height:515px;border-radius:18px}.card-face{border-radius:18px}.card-art{height:215px;border-radius:18px 18px 0 0}.card-copy{padding:21px 23px 17px}.card-copy h2{font-size:24px;line-height:1.45;letter-spacing:.1px;margin:12px 0 7px}.card-sub{font-size:10px;margin-bottom:12px}.card-body{font-size:12px;line-height:1.95;letter-spacing:.2px}.card-meta{font-size:7px}.card-meta>span:last-child{font-size:8px}.card-bottom{padding-top:10px;min-height:35px}.source-links{font-size:7px}.source-links a{max-width:180px}.flip-link{font-size:9px}.flip-link .icon{height:13px;width:13px}.card-type{top:17px;left:18px;padding:6px 10px;font-size:9px}.save-button{top:15px;right:16px;height:35px;width:35px}.art-caption{font-size:6px;left:20px;bottom:14px;letter-spacing:1.7px}.deck-navigation{margin-top:19px;gap:21px}.round-button{height:43px;width:43px}.next-button{height:43px;font-size:11px;padding:0 20px;min-width:112px}.deck-position>span{font-size:11px}.reader-hint{margin:15px 0;font-size:8px;gap:6px}.reader-hint .icon{height:12px;width:12px}.site-footer{border:0;display:block;text-align:center;padding:7px 0 14px;font-size:8px}.site-footer>span:first-child{display:none}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#10251fee;backdrop-filter:blur(20px);border-top:1px solid #c4d7b317;padding:11px 25px calc(10px + env(safe-area-inset-bottom));justify-content:space-around;z-index:15}.mobile-nav button{min-width:60px;display:flex;align-items:center;flex-direction:column;gap:6px;color:#7a927e;font-size:9px}.mobile-nav button>.icon{height:20px;width:20px}.mobile-nav button.active{color:var(--accent)}.mobile-nav button.active>.icon{fill:var(--accent);stroke-width:0}.back-content h2{font-size:29px}.back-content p{font-size:16px;max-height:250px}.card-back{padding:27px}.back-top{font-size:10px}.back-bottom span{max-width:160px;line-height:1.7;font-size:8px}.back-bottom button{font-size:9px;white-space:nowrap}.back-watermark{font-size:180px;top:48px}.toast{bottom:calc(90px + env(safe-area-inset-bottom));font-size:11px}.app-dialog{border-radius:22px;max-height:calc(100dvh - 44px)}.dialog-shell{padding:35px 25px 25px}.dialog-shell h2{font-size:28px}.empty-state{min-height:515px}.dialog-symbol{height:56px;width:56px;border-radius:17px}}
@media(max-width:360px){.shell{width:calc(100% - 28px)}.overview h1{font-size:26px}.card-copy{padding-inline:19px}.card-copy h2{font-size:21px}.card-art{height:194px}.learning-card,.deck{height:510px;min-height:510px}.source-links a{max-width:142px}.category-tabs button{padding-inline:8px}.back-content h2{font-size:25px}.back-content p{font-size:15px}.card-back{padding:24px}.reader-hint{letter-spacing:0;font-size:7px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.card-inner,.learning-card.is-flipped .card-inner{transform:none}.card-back{transform:none}.learning-card:not(.is-flipped) .card-back,.learning-card.is-flipped .card-front{visibility:hidden}.learning-card.is-flipped .card-back{z-index:3}}
@supports not (backface-visibility:hidden){.card-inner,.learning-card.is-flipped .card-inner{transform:none}.card-back{transform:none}.learning-card:not(.is-flipped) .card-back,.learning-card.is-flipped .card-front{visibility:hidden}.learning-card.is-flipped .card-back{z-index:3}}
/* Keep the primary action above the mobile app bar on typical portrait screens. */
@media(max-width:760px){.site-header{height:77px}.reader{margin-top:19px}.learning-card{height:clamp(440px,calc(100svh - 395px),515px)}.deck{min-height:clamp(440px,calc(100svh - 395px),515px)}.card-art{height:clamp(175px,calc(30svh - 65px),215px)}.save-button{width:44px;height:44px;right:13px;top:12px}.flip-link{min-height:36px}.card-copy{padding-top:18px}.card-copy h2{margin-top:10px}.reader-hint{margin-block:12px}.card-back .back-content p{max-height:200px}}
@media(max-width:360px){.learning-card{height:460px}.deck{height:auto;min-height:460px}.card-art{height:175px}.card-copy{padding-top:18px}}
@media(max-width:760px){.category-tabs button{min-height:44px}.reader-toolbar{height:51px}.learning-card{height:clamp(440px,calc(100svh - 415px),515px)}.deck{min-height:clamp(440px,calc(100svh - 415px),515px)}.round-button,.next-button{height:44px}.flip-link{min-height:44px}.card-body{font-size:13px;line-height:1.85}.mobile-nav button{min-height:44px}.card-copy{padding-bottom:13px}.card-bottom{padding-top:4px}.card-sub{margin-bottom:10px}}
.preview-banner{background:#e5cd8c;color:#3b3e26;padding:10px 20px;text-align:center;font-size:12px;line-height:1.6}
.dashboard-actions{display:flex;justify-content:space-between;gap:20px}.dashboard-actions .clear-button{min-height:44px}
/* Safari/WebKit fallback: backdrop-filter may flatten the 3D layer tree. */
.flat-flip .card-inner,.flat-flip .learning-card.is-flipped .card-inner{transform:none!important;transition:none}
.flat-flip .card-face{backface-visibility:visible;-webkit-backface-visibility:visible;transition:opacity .18s ease-out}
.flat-flip .card-back{transform:none;visibility:hidden;opacity:0}
.flat-flip .learning-card.is-flipped .card-front{visibility:hidden;opacity:0}
.flat-flip .learning-card.is-flipped .card-back{visibility:visible;opacity:1;z-index:3}
/* Let a long back scroll between the fixed label and return action. */
.back-content{min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.card-back .back-content p{max-height:none;overflow:visible}
.back-top,.back-bottom{flex-shrink:0}
@media(max-width:760px){.back-content{padding-block:10px}.back-content h2{margin:18px 0}.back-tags{margin-top:20px}.back-bottom{padding-top:13px}}
.deck-dots{display:flex;gap:3px;margin-top:7px;height:3px;max-width:160px}.deck-dots span{height:3px;flex:1;min-width:1px;max-width:10px;border-radius:2px;background:#44604a70}.deck-dots span.absorbed{background:#879d71}.deck-dots span.current{background:var(--accent)}