:root{--paper:#f5efe4;--paper-deep:#ebe2d4;--surface:#fffaf2;--surface-strong:#fff;--ink:#1d2923;--muted:#6e756e;--line:#1d29231f;--forest:#24493c;--forest-dark:#183329;--coral:#e76f51;--coral-soft:#f8d9cd;--sun:#f3c969;--sage:#b8cabb;--blue:#4a7184;--danger:#a54436;--shadow:0 18px 48px #2c261d17;--radius-sm:14px;--radius-md:22px;--radius-lg:32px;--content:1120px}*{box-sizing:border-box}html{background:var(--paper);color:var(--ink);scroll-behavior:smooth}body{background:var(--paper);-webkit-font-smoothing:antialiased;min-height:100vh;margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{color:inherit}::selection{background:var(--sun);color:var(--ink)}h1,h2,h3,p{margin-top:0}h1{letter-spacing:-.065em;font-size:clamp(2.3rem,5vw,4.8rem);font-weight:690;line-height:.98}h2{letter-spacing:-.045em;font-size:clamp(1.55rem,3vw,2.5rem);line-height:1.05}h3{letter-spacing:-.018em;font-size:1.05rem;line-height:1.25}.eyebrow{color:var(--coral);text-transform:uppercase;letter-spacing:.13em;font-size:.75rem;font-weight:760}.muted{color:var(--muted)}.meta{color:var(--muted);font-size:.78rem}.section-heading{justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:18px;display:flex}.section-heading h2{margin-bottom:0}.section-heading a{color:var(--forest);font-size:.88rem;font-weight:720}.button{cursor:pointer;border:0;border-radius:999px;justify-content:center;align-items:center;gap:9px;min-height:44px;padding:0 19px;font-weight:720;transition:transform .16s,background .16s,color .16s,box-shadow .16s;display:inline-flex}.button:active{transform:scale(.975)}.button:disabled{opacity:.55;cursor:wait}.button-primary{background:var(--forest);color:#fffaf1;box-shadow:0 8px 20px #24493c2e}.button-primary:hover{background:var(--forest-dark)}.button-secondary{background:var(--paper-deep);color:var(--ink)}.button-ghost{border:1px solid var(--line);background:0 0}.button-coral{background:var(--coral);color:#fff}.button-large{min-height:54px;padding-inline:24px}.full-width{width:100%}.icon-button{background:var(--paper-deep);cursor:pointer;border:0;border-radius:50%;place-items:center;width:44px;height:44px;display:inline-grid}.icon-button.active{background:var(--coral-soft);color:var(--danger)}.logo{letter-spacing:-.05em;align-items:center;gap:10px;font-size:1.4rem;font-weight:780;display:inline-flex}.logo-mark{background:var(--forest);color:#fffaf1;letter-spacing:-.08em;border-radius:12px;place-items:center;width:38px;height:38px;font-size:1.16rem;display:grid}.app-shell{min-height:100vh}.desktop-sidebar{display:none}.page-shell{min-height:100vh;padding:28px 20px calc(112px + env(safe-area-inset-bottom))}.page-content{width:min(100%, var(--content));margin-inline:auto}.page-header{justify-content:space-between;align-items:center;gap:18px;margin-bottom:28px;display:flex}.page-header h1{margin-bottom:7px;font-size:clamp(2.1rem,7vw,3.7rem)}.page-header p{color:var(--muted);margin-bottom:0}.bottom-nav{z-index:30;left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#fffaf2f0;border:1px solid #1d29231a;border-radius:22px;grid-template-columns:repeat(7,1fr);align-items:center;height:66px;padding:5px;display:grid;position:fixed;box-shadow:0 10px 34px #1d292329}.bottom-nav a{min-width:0;height:55px;color:var(--muted);border-radius:17px;flex-direction:column;justify-content:center;align-items:center;gap:3px;font-size:clamp(.52rem,1.7vw,.65rem);font-weight:680;display:flex}.bottom-nav a.active{background:var(--paper-deep);color:var(--forest)}.floating-add{z-index:35;right:21px;bottom:calc(91px + env(safe-area-inset-bottom));color:#fff;background:var(--coral);border-radius:50%;place-items:center;width:58px;height:58px;display:grid;position:fixed;box-shadow:0 12px 28px #b7452c4d}.app-shell:has(.selection-bar) .floating-add{display:none}.app-shell:has(.flashcards-page) .floating-add{display:none}.login-page{background:var(--forest);place-items:center;min-height:100svh;padding:24px;display:grid;position:relative;overflow:hidden}.login-ambient{color:#ffffff12;letter-spacing:-.08em;font-size:clamp(5rem,15vw,14rem);font-weight:740;position:absolute;inset:0}.login-ambient span{white-space:nowrap;position:absolute}.login-ambient span:first-child{top:-4%;left:-3%;transform:rotate(-6deg)}.login-ambient span:nth-child(2){top:40%;right:-15%;transform:rotate(8deg)}.login-ambient span:nth-child(3){bottom:-7%;left:4%;transform:rotate(-3deg)}.login-card{z-index:1;background:var(--surface);border-radius:30px;width:min(100%,480px);padding:30px;position:relative;box-shadow:0 30px 90px #07151059}.login-copy{padding-block:48px 28px}.login-copy h1{margin-bottom:20px;font-size:clamp(2.6rem,10vw,4.5rem)}.login-copy>p:last-child{color:var(--muted);font-size:1.05rem;line-height:1.6}.login-form{gap:15px;display:grid}.login-form label,.field-label{color:var(--muted);gap:7px;font-size:.78rem;font-weight:750;display:grid}.login-form input,.text-input,.select-input,.textarea-input{width:100%;min-height:52px;color:var(--ink);border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;outline:0;padding:13px 15px;transition:border .15s,box-shadow .15s}.login-form input:focus,.text-input:focus,.select-input:focus,.textarea-input:focus{border-color:var(--forest);box-shadow:0 0 0 3px #24493c1c}.textarea-input{resize:vertical;min-height:126px;line-height:1.5}.form-error{color:var(--danger);margin:0;font-size:.85rem}.hero-grid{gap:16px;margin-bottom:42px;display:grid}.continue-card{border-radius:var(--radius-lg);background:var(--forest);color:#fffaf1;min-height:340px;box-shadow:var(--shadow);flex-direction:column;justify-content:space-between;padding:28px;display:flex;position:relative;overflow:hidden}.continue-card:after{content:"";border:55px solid #f3c9692e;border-radius:50%;width:260px;height:260px;position:absolute;bottom:-110px;right:-100px}.continue-card .eyebrow{color:var(--sun)}.continue-card h2{max-width:620px;margin-bottom:8px;font-size:clamp(2.25rem,7vw,4rem)}.continue-card p{color:#fffaf1b3}.continue-bottom{z-index:1;justify-content:space-between;align-items:center;gap:18px;display:flex;position:relative}.play-main{background:var(--coral);color:#fff;border:0;border-radius:50%;flex:none;place-items:center;width:78px;height:78px;display:grid;box-shadow:0 14px 28px #0000002e}.waveform{flex:1;align-items:center;gap:4px;max-width:340px;height:42px;display:flex}.waveform i{background:#fffaf16b;border-radius:99px;width:4px;display:block}.waveform i:nth-child(4n+1){height:34%}.waveform i:nth-child(4n+2){height:80%}.waveform i:nth-child(4n+3){height:52%}.waveform i:nth-child(4n){height:100%}.progress-card{border-radius:var(--radius-lg);background:var(--sun);flex-direction:column;justify-content:space-between;min-height:190px;padding:24px;display:flex}.progress-card h3{margin-bottom:5px;font-size:1.35rem}.progress-ring{background:conic-gradient(var(--forest) var(--progress,0%), #ffffff73 0);border-radius:50%;place-items:center;width:86px;height:86px;display:grid;position:relative}.progress-ring:before{content:"";background:var(--sun);border-radius:50%;position:absolute;inset:9px}.progress-ring strong{font-size:1.15rem;position:relative}.progress-card-bottom{justify-content:space-between;align-items:flex-end;gap:15px;display:flex}.quick-grid{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:42px;display:grid}.quick-card{border-radius:var(--radius-md);background:var(--surface);border:1px solid var(--line);flex-direction:column;justify-content:space-between;min-height:128px;padding:18px;display:flex}.quick-card>span:first-child{background:var(--coral-soft);width:40px;height:40px;color:var(--danger);border-radius:13px;place-items:center;display:grid}.quick-card:nth-child(2)>span:first-child{color:var(--forest);background:#dbe7df}.quick-card strong{font-size:1rem}.quick-card small{color:var(--muted);margin-top:3px;display:block}.lesson-list{gap:10px;display:grid}.lesson-row{background:var(--surface);border:1px solid var(--line);border-radius:19px;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:13px;padding:13px;display:grid}.lesson-row-main{grid-template-columns:auto minmax(0,1fr);align-items:center;gap:13px;min-width:0;display:grid}.lesson-copy{min-width:0}.lesson-art{background:var(--sage);width:56px;height:56px;color:var(--forest);border-radius:16px;place-items:center;display:grid}.lesson-row:nth-child(3n+2) .lesson-art{background:var(--coral-soft);color:var(--danger)}.lesson-row h3{text-overflow:ellipsis;white-space:nowrap;margin-bottom:5px;overflow:hidden}.lesson-row p{color:var(--muted);margin:0;font-size:.78rem}.status-pill{background:var(--paper-deep);width:fit-content;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;border-radius:999px;align-items:center;gap:5px;padding:5px 9px;font-size:.68rem;font-weight:760;display:inline-flex}.status-pill.ready{color:var(--forest);background:#dcebe0}.status-pill.failed{background:var(--coral-soft);color:var(--danger)}.lesson-row-actions{align-items:center;gap:8px;display:flex}.lesson-play,.lesson-delete{width:38px;height:38px;color:var(--forest);border-radius:50%;place-items:center;display:grid}.lesson-delete{cursor:pointer;color:var(--muted);background:0 0;border:0;transition:color .15s,background .15s}.lesson-delete:hover{color:var(--danger);background:var(--coral-soft)}.lesson-delete:disabled{cursor:not-allowed;opacity:.38}.lesson-error{color:var(--danger);margin-top:5px;font-size:.7rem;display:block}.automatic-audio-card{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--forest);color:#fffaf1;box-shadow:var(--shadow);grid-template-columns:auto minmax(0,1fr);align-items:start;gap:16px;margin-bottom:18px;padding:22px;display:grid;position:relative;overflow:hidden}.automatic-audio-card:after{content:"AUTO";color:#ffffff0b;letter-spacing:-.08em;pointer-events:none;font-size:5.8rem;font-weight:800;position:absolute;bottom:-28px;right:-9px}.automatic-audio-card.ready{color:var(--forest);box-shadow:none;background:#dce8de}.automatic-audio-card.ready:after{color:#24493c0b}.automatic-audio-mark{z-index:1;background:var(--sun);width:50px;height:50px;color:var(--forest);border-radius:16px;place-items:center;display:grid;position:relative}.automatic-audio-card>div{z-index:1;position:relative}.automatic-audio-card .eyebrow{color:var(--sun);margin-bottom:7px}.automatic-audio-card.ready .eyebrow{color:var(--forest)}.automatic-audio-card h2{margin-bottom:7px;font-size:clamp(1.35rem,4vw,2rem)}.automatic-audio-card p:last-child{color:#fffaf1ad;max-width:720px;margin:0;font-size:.86rem;line-height:1.5}.automatic-audio-card.ready p:last-child{color:var(--muted)}.automatic-audio-status{z-index:1;color:#fffaf1c2;text-transform:uppercase;letter-spacing:.06em;border:1px solid #ffffff29;border-radius:999px;grid-column:2;width:fit-content;padding:6px 10px;font-size:.68rem;font-weight:750;position:relative}.automatic-audio-card.ready .automatic-audio-status{color:var(--forest);border-color:#24493c24}.custom-lesson-panel{margin-top:18px}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.category-card{border-radius:var(--radius-md);background:var(--surface);border:1px solid var(--line);flex-direction:column;justify-content:space-between;min-height:174px;padding:20px;transition:transform .17s,box-shadow .17s;display:flex}.category-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.category-card:nth-child(4n+1){background:var(--forest);color:#fffaf1}.category-card:nth-child(4n+2){background:var(--sun)}.category-card:nth-child(4n+3){background:#dbe7df}.category-card:nth-child(4n){background:var(--coral-soft)}.category-card .category-icon{background:#ffffff7a;border-radius:14px;place-items:center;width:42px;height:42px;display:grid}.category-card h3{margin:0;font-size:1.13rem}.category-card p{opacity:.66;margin:6px 0 0;font-size:.78rem;line-height:1.35}.book-grid{gap:18px;display:grid}.book-card{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);min-height:360px;box-shadow:var(--shadow);grid-template-columns:minmax(150px,210px) minmax(0,1fr);align-items:center;gap:clamp(22px,4vw,48px);padding:22px;transition:transform .18s,box-shadow .18s;display:grid;position:relative;overflow:hidden}.book-card:hover{transform:translateY(-3px);box-shadow:0 24px 64px #2c261d21}.book-cover{aspect-ratio:3/4;background:var(--forest);color:#fffaf1;border-radius:8px 18px 18px 8px;flex-direction:column;padding:24px 19px;display:flex;position:relative;overflow:hidden;box-shadow:-8px 12px 28px #1d292333,inset 7px 0 #ffffff0f}.book-cover:after{content:"ES";color:#f3c96921;letter-spacing:-.1em;font-size:7.5rem;font-weight:790;position:absolute;bottom:-30px;right:-12px}.book-cover>span{color:var(--sun);letter-spacing:.13em;text-transform:uppercase;font-size:.58rem;font-weight:760}.book-cover strong{z-index:1;letter-spacing:-.065em;max-width:150px;margin:auto 0;font-size:clamp(1.65rem,4vw,2.45rem);line-height:.94;position:relative}.book-cover small{z-index:1;color:#fffaf1a6;font-size:.64rem;font-weight:650;position:relative}.book-card-copy{gap:20px;display:grid}.book-card-icon{background:var(--coral-soft);width:48px;height:48px;color:var(--danger);border-radius:16px;place-items:center;display:grid}.book-card-copy h2{margin:8px 0 10px;font-size:clamp(2rem,5vw,3.6rem)}.book-card-copy p{max-width:560px;color:var(--muted);margin:0;line-height:1.55}.book-card-meta{flex-wrap:wrap;gap:8px;display:flex}.book-card-meta span{background:var(--paper-deep);min-height:34px;color:var(--muted);border-radius:999px;align-items:center;gap:6px;padding:0 12px;font-size:.72rem;font-weight:690;display:inline-flex}.book-card-arrow{color:var(--forest);position:absolute;top:24px;right:24px}.book-back{width:fit-content;color:var(--muted);align-items:center;gap:7px;margin-bottom:24px;font-size:.8rem;font-weight:720;display:inline-flex}.book-back:hover{color:var(--forest)}.book-detail-hero{border-radius:var(--radius-lg);background:var(--forest);color:#fffaf1;min-height:350px;box-shadow:var(--shadow);flex-direction:column;justify-content:space-between;margin-bottom:46px;padding:clamp(28px,5vw,52px);display:flex;position:relative;overflow:hidden}.book-detail-hero:after{content:"KTS";color:#ffffff0d;letter-spacing:-.12em;font-size:clamp(8rem,22vw,16rem);font-weight:800;position:absolute;bottom:-55px;right:-22px}.book-detail-hero>div{z-index:1;position:relative}.book-detail-hero .eyebrow{color:var(--sun)}.book-detail-hero h1{max-width:780px;margin-bottom:14px;font-size:clamp(2.8rem,8vw,6.3rem)}.book-detail-hero>div>p:last-child{color:#fffaf1ad;max-width:660px;margin-bottom:32px;font-size:1rem;line-height:1.6}.book-detail-rhythm{flex-wrap:wrap;gap:8px;display:flex}.book-detail-rhythm span{color:#fffaf1c7;border:1px solid #ffffff24;border-radius:999px;align-items:center;gap:7px;min-height:36px;padding:0 12px;font-size:.72rem;font-weight:680;display:inline-flex}.book-listening-section{margin-bottom:48px}.book-listening-heading{grid-template-columns:auto minmax(0,1fr);align-items:start;gap:16px;margin-bottom:18px;display:grid}.book-listening-mark{background:var(--coral);color:#fff;border-radius:18px;place-items:center;width:56px;height:56px;display:grid;box-shadow:0 10px 24px #b7452c33}.book-listening-heading .eyebrow{margin:2px 0 8px}.book-listening-heading h2{max-width:760px;margin-bottom:9px;font-size:clamp(2rem,5vw,3.7rem)}.book-listening-heading>div>p:last-child{max-width:730px;color:var(--muted);margin:0;line-height:1.55}.book-listening-controls{flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 18px 72px;display:flex}.book-listening-controls>span{color:var(--muted);font-size:.7rem;font-weight:680}.book-gap-picker{border:1px solid var(--line);background:var(--paper-deep);border-radius:999px;align-items:center;gap:11px;width:fit-content;min-height:48px;padding:5px 6px 5px 13px;display:flex}.book-gap-picker>span{color:var(--muted);white-space:nowrap;font-size:.7rem;font-weight:720}.book-gap-options{align-items:center;gap:3px;display:flex}.book-gap-options button{min-width:42px;height:36px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:999px;padding:0 9px;font-size:.72rem;font-weight:760;transition:background .15s,color .15s,transform .15s}.book-gap-options button:active{transform:scale(.95)}.book-gap-options button.active{background:var(--forest);color:#fff;box-shadow:0 5px 13px #24493c2e}.book-listening-grid{gap:12px;display:grid}.book-listening-pack{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);flex-direction:column;min-height:270px;padding:22px;display:flex;position:relative;overflow:hidden;box-shadow:0 12px 34px #2c261d0e}.book-listening-pack:after{content:attr(data-range);color:#24493c09;letter-spacing:-.1em;pointer-events:none;font-size:7rem;font-weight:800;position:absolute;bottom:-26px;right:-12px}.book-listening-pack:nth-child(4n+2) .book-pack-range{background:var(--sun)}.book-listening-pack:nth-child(4n+3) .book-pack-range{background:var(--coral-soft);color:var(--danger)}.book-listening-pack:nth-child(4n) .book-pack-range{background:#dbe7df}.book-pack-topline{z-index:1;justify-content:space-between;align-items:center;gap:10px;display:flex;position:relative}.book-pack-topline>span:last-child{color:var(--muted);align-items:center;gap:5px;font-size:.68rem;font-weight:700;display:inline-flex}.book-pack-range{background:var(--paper-deep);min-height:34px;color:var(--forest);letter-spacing:.08em;border-radius:10px;align-items:center;padding:0 11px;font-size:.72rem;font-weight:790;display:inline-flex}.book-pack-copy{z-index:1;margin:27px 0 22px;position:relative}.book-pack-copy .eyebrow{margin-bottom:7px;font-size:.64rem}.book-pack-copy h3{margin-bottom:8px;font-size:clamp(1.45rem,3vw,1.95rem)}.book-pack-copy>p:last-child{color:var(--muted);margin:0;font-size:.76rem}.book-pack-actions{z-index:1;grid-template-columns:1fr 1fr;gap:8px;margin-top:auto;display:grid;position:relative}.book-pack-actions .button{min-width:0;padding-inline:12px;font-size:.78rem}.book-pack-actions .button-ghost{background:#ffffff85}.book-pack-unavailable{z-index:1;color:var(--danger);margin-top:9px;font-size:.68rem;line-height:1.4;position:relative}.book-listening-error{margin-top:12px}.book-chapter-list{gap:11px;display:grid}.book-chapter-card{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:17px;min-height:118px;padding:16px;transition:transform .16s,border-color .16s;display:grid}.book-chapter-card:hover{border-color:var(--sage);transform:translate(3px)}.book-chapter-number{background:var(--paper-deep);width:68px;height:80px;color:var(--forest);letter-spacing:-.04em;border-radius:18px;place-items:center;font-size:1.35rem;font-weight:770;display:grid}.book-chapter-card:nth-child(2n) .book-chapter-number{background:var(--sun)}.book-chapter-copy .eyebrow{margin-bottom:7px;font-size:.65rem}.book-chapter-copy h3{margin-bottom:6px;font-size:clamp(1.2rem,3vw,1.55rem)}.book-chapter-copy p{color:var(--muted);margin:0;font-size:.78rem}.book-chapter-arrow{background:var(--forest);color:#fff;border-radius:50%;place-items:center;width:42px;height:42px;display:grid}.book-chapter-header{justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px;display:flex}.book-chapter-header h1{max-width:800px;margin:8px 0 12px;font-size:clamp(2.7rem,8vw,5.6rem)}.book-chapter-header>div>p:last-child{max-width:650px;color:var(--muted);margin:0;line-height:1.55}.book-chapter-emblem{background:var(--sun);width:112px;height:112px;color:var(--forest);border-radius:30px;flex:none;align-content:center;place-items:center;gap:8px;display:grid}.book-chapter-emblem small{font-size:.63rem;font-weight:730}.chapter-reader{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow);margin-bottom:34px;padding:clamp(18px,4vw,34px)}.chapter-reader-heading{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:22px;padding-bottom:18px;display:flex}.chapter-reader-heading h2{margin:7px 0 0}.chapter-reader-heading>span{background:var(--paper-deep);min-height:32px;color:var(--muted);border-radius:999px;flex:none;align-items:center;gap:6px;padding:0 10px;font-size:.68rem;font-weight:740;display:inline-flex}.chapter-sentence-list{display:grid}.chapter-sentence{border-bottom:1px solid var(--line);grid-template-columns:36px minmax(0,1fr);gap:14px;padding:20px 0;display:grid}.chapter-sentence:last-child{border-bottom:0}.chapter-sentence-number{background:var(--paper-deep);width:32px;height:32px;color:var(--muted);border-radius:10px;place-items:center;font-size:.65rem;font-weight:760;display:grid}.chapter-sentence .spanish{letter-spacing:-.025em;margin:0 0 7px;font-size:clamp(1.22rem,3vw,1.65rem);font-weight:680;line-height:1.4}.chapter-sentence .english{color:var(--muted);margin:0;font-size:.92rem;line-height:1.5}.chapter-recall{margin-bottom:34px}.chapter-recall-heading{margin-bottom:17px}.chapter-recall-heading h2{margin:7px 0 8px}.chapter-recall-heading p:last-child{color:var(--muted);margin:0;line-height:1.5}.chapter-recall-grid{gap:10px;display:grid}.chapter-recall-card{border:1px solid var(--line);background:var(--surface);border-radius:20px;overflow:hidden}.chapter-recall-card summary{cursor:pointer;justify-content:space-between;align-items:center;gap:14px;min-height:90px;padding:17px 19px;list-style:none;display:flex}.chapter-recall-card summary::-webkit-details-marker{display:none}.chapter-recall-card summary>span:first-child{gap:5px;display:grid}.chapter-recall-card summary 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