:root{color:#17312a;background:#f3f1eb;font-family:Avenir Next,Avenir,Segoe UI,Helvetica Neue,Arial,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--page-max: 1180px;--ink: #17312a;--muted: #5d6c67}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 18% 8%,rgba(255,255,255,.95),transparent 24rem),linear-gradient(135deg,#f8f7f1,#e7e5dd)}body.modal-open{overflow:hidden}button{font:inherit}.site-shell{width:min(var(--page-max),calc(100% - 32px));margin:0 auto;padding:34px 0 52px}.hero{position:relative;display:flex;align-items:end;justify-content:space-between;gap:24px;min-height:168px;padding:8px 6px 30px}.hero__header{flex:1 1 auto;max-width:1040px;min-width:0}.eyebrow{margin:0 0 10px;color:#006f32;font-size:.82rem;font-weight:800;letter-spacing:0;text-transform:uppercase}.hero h1{max-width:1040px;margin:0;color:var(--ink);font-size:4.8rem;line-height:.95;letter-spacing:0}.hero__intro{max-width:620px;margin:18px 0 0;color:var(--muted);font-size:1.12rem;line-height:1.55}.hero__fastener{flex:0 0 auto;width:78px;height:78px;margin:0 18px 16px 0;border-radius:999px;background:radial-gradient(circle at 43% 38%,#ffffff 0 9px,transparent 10px),radial-gradient(circle at 50% 50%,#f5f5f2 0,#f5f5f2 35%,#d7d7d0 36%,#d7d7d0 53%,#fff 54%);box-shadow:0 14px 24px #3237343d,inset 0 -5px 10px #0000001f}.card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;align-items:stretch}.card-button{position:relative;display:block;width:100%;min-width:0;padding:0;border:0;border-radius:20px;background:transparent;cursor:pointer;transform:rotate(var(--tilt));transition:transform .18s ease,filter .18s ease}.card-button:hover,.card-button:focus-visible{z-index:2;transform:translateY(-8px) rotate(0);filter:saturate(1.08)}.card-button:focus-visible{outline:4px solid rgba(23,49,42,.3);outline-offset:6px}.lesson-card{position:relative;display:grid;overflow:hidden;width:100%;color:#fff;background:linear-gradient(160deg,rgba(255,255,255,.12),transparent 28%),radial-gradient(circle at 72% 72%,rgba(0,0,0,.12),transparent 27%),var(--card-color);border:1px solid rgba(255,255,255,.34);border-radius:18px;box-shadow:0 24px 36px #1c24202e,inset 0 0 0 1px #ffffff24;isolation:isolate}.lesson-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;opacity:.16;background-image:linear-gradient(0deg,rgba(255,255,255,.26) 1px,transparent 1px),linear-gradient(90deg,rgba(0,0,0,.2) 1px,transparent 1px);background-size:5px 5px,7px 7px;mix-blend-mode:soft-light}.lesson-card:after{content:"";position:absolute;width:46px;height:46px;border-radius:999px;background:radial-gradient(circle at 45% 40%,#ffffff 0 6px,transparent 7px),radial-gradient(circle at 50% 50%,#fff 0,#fff 44%,#dadad2 45%,#dadad2 60%,#fff 61%);box-shadow:0 8px 14px #00000038,inset 0 -3px 6px #00000021}.lesson-card--tile{aspect-ratio:.55;min-height:420px;padding:13% 9% 12%;grid-template-rows:33% minmax(0,1fr) auto}.lesson-card--tile:after{top:18px;left:18px}.lesson-card--spread{width:min(430px,100%);min-height:min(78vh,690px);padding:42px 30px 36px;grid-template-rows:30% 1fr auto;border-radius:20px 4px 4px 20px}.lesson-card--spread:after{top:20px;right:20px}.lesson-card__icon{display:flex;align-items:end;justify-content:center;min-height:96px;color:#ffffffe6}.card-icon{width:min(56%,138px);height:auto;max-height:138px;object-fit:contain;filter:brightness(0) invert(1)}.lesson-card--spread .card-icon{width:132px}.lesson-card__title{align-self:center;margin:0;color:#ffffffed;font-size:1.9rem;font-weight:400;line-height:1.35;letter-spacing:0;text-align:right}.lesson-card--tile .lesson-card__title{font-size:1.24rem;text-align:center;overflow-wrap:anywhere}.lesson-card--spread .lesson-card__title{font-size:2.65rem}.lesson-card__title span{display:block}.lesson-card__footer{display:grid;gap:2px;justify-items:end;color:#ffffff94;font-size:.96rem;font-style:italic;font-weight:300;line-height:1.18;text-align:right}.lesson-card__footer i{display:block;width:80%;height:2px;margin:7px 0 4px;background:#ffffffb3}.lesson-card__footer span:last-child{font-style:normal}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:grid;place-items:center;padding:24px;background:#131d1aad;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.book-modal{width:min(1120px,100%);max-height:min(880px,calc(100vh - 48px));overflow:auto;color:var(--ink)}.book-controls{display:grid;grid-template-columns:48px 1fr 48px 48px;gap:12px;align-items:center;margin-bottom:14px}.book-title-wrap{min-width:0;color:#fff;text-align:center}.book-title-wrap p,.book-title-wrap h2{margin:0}.book-title-wrap p{color:#ffffffb3;font-size:.82rem;font-weight:800;letter-spacing:0;text-transform:uppercase}.book-title-wrap h2{overflow:hidden;font-size:1.7rem;letter-spacing:0;text-overflow:ellipsis;white-space:nowrap}.icon-button{display:grid;place-items:center;width:48px;height:48px;border:1px solid rgba(255,255,255,.28);border-radius:999px;color:#fff;background:#ffffff1f;cursor:pointer;transition:transform .16s ease,background .16s ease}.icon-button span{font-size:2rem;line-height:1}.icon-button--close span{font-size:1.65rem}.icon-button:hover,.icon-button:focus-visible{background:#ffffff38;transform:translateY(-1px)}.icon-button:focus-visible{outline:3px solid rgba(255,255,255,.45);outline-offset:3px}.book-spread{display:grid;grid-template-columns:minmax(340px,.98fr) minmax(340px,1.12fr);align-items:stretch;justify-content:center;filter:drop-shadow(0 26px 46px rgba(0,0,0,.34))}.mobile-flip-cue{display:none}.book-page{position:relative;overflow:hidden;min-height:min(78vh,690px);padding:clamp(28px,4vw,54px);color:#ffffffeb;background:linear-gradient(160deg,rgba(255,255,255,.12),transparent 30%),radial-gradient(circle at 73% 74%,rgba(0,0,0,.16),transparent 28%),var(--card-color);border-left:1px solid rgba(255,255,255,.24);border-radius:4px 20px 20px 4px;box-shadow:inset 12px 0 22px #00000029}.book-page:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.12;background-image:linear-gradient(0deg,rgba(255,255,255,.28) 1px,transparent 1px),linear-gradient(90deg,rgba(0,0,0,.22) 1px,transparent 1px);background-size:5px 5px,7px 7px;mix-blend-mode:soft-light;pointer-events:none}.book-page__label{position:relative;margin:0 0 8px;color:#ffffff9e;font-size:.75rem;font-weight:800;letter-spacing:0;text-transform:uppercase}.book-page__topic{position:relative;margin:0 0 clamp(20px,4vh,36px);color:#fff;font-size:2.15rem;line-height:1.08;letter-spacing:0}.book-page__copy,.book-page__bullets{position:relative}.book-page__copy{display:grid;gap:18px;margin-bottom:clamp(24px,5vh,42px);font-size:1.48rem;line-height:1.32}.book-page__copy p{margin:0}.book-page strong{font-weight:850}.book-page__bullets{display:grid;gap:17px;margin:0;padding:0;color:#ffffffc7;font-size:1.15rem;font-weight:450;line-height:1.38;list-style:none}.book-page__bullets li{display:grid;grid-template-columns:22px 1fr;gap:8px}.book-page__bullets li:before{content:"";width:16px;height:2px;margin-top:.72em;background:#ffffffbf}@media(max-width:840px){.site-shell{width:min(100% - 22px,var(--page-max));padding-top:24px}.hero{min-height:0;padding-bottom:24px}.hero h1{font-size:3.15rem}.hero__intro{font-size:1rem}.hero__fastener{display:none}.card-grid{grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:18px}.lesson-card--tile{min-height:340px}.lesson-card--tile:after{top:10px;left:10px}.lesson-card--tile .lesson-card__title{font-size:1rem}.lesson-card__footer{font-size:.76rem}.book-spread{display:block;position:relative;width:min(390px,calc(100vw - 28px));height:min(72vh,620px);min-height:520px;margin:0 auto;cursor:pointer;outline:none;perspective:1400px;touch-action:pan-y;transform:translate(var(--swipe-x, 0)) rotate(var(--swipe-rotate, 0deg));transform-style:preserve-3d;transition:opacity .18s ease,transform .18s cubic-bezier(.22,1,.36,1);will-change:transform}.book-spread:focus-visible{outline:4px solid rgba(255,255,255,.45);outline-offset:8px}.book-spread--swipe-dragging{transition:none}.book-spread--swipe-next{opacity:.64;transform:translate(-34%) rotate(-4deg) scale(.98)}.book-spread--swipe-previous{opacity:.64;transform:translate(34%) rotate(4deg) scale(.98)}.lesson-card--spread{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;min-height:0;padding:38px 28px 32px;border-radius:20px;backface-visibility:hidden;transform:rotateY(0);transition:transform .52s cubic-bezier(.22,1,.36,1)}.book-page{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;min-height:0;overflow:auto;padding:34px 28px;border-left:0;border-radius:20px;backface-visibility:hidden;box-shadow:inset 0 0 0 1px #ffffff1f;transform:rotateY(180deg);transition:transform .52s cubic-bezier(.22,1,.36,1)}.book-spread--flipped .lesson-card--spread{transform:rotateY(-180deg)}.book-spread--flipped .book-page{transform:rotateY(0)}.mobile-flip-cue{position:absolute;left:18px;bottom:18px;z-index:4;display:grid;place-items:center;width:46px;height:46px;border:1px solid rgba(255,255,255,.42);border-radius:999px;color:#fff;background:#ffffff29;box-shadow:0 12px 22px #0000002e;pointer-events:none;transition:opacity .22s ease,transform .52s cubic-bezier(.22,1,.36,1)}.mobile-flip-cue span{font-size:1.45rem;line-height:1}.book-spread--flipped .mobile-flip-cue{transform:rotate(180deg)}.book-page__topic{font-size:1.55rem}.book-page__copy{font-size:1.02rem}.book-page__bullets{gap:12px;font-size:.92rem;line-height:1.3}}@media(max-width:560px){.modal-overlay{padding:12px;align-items:center}.book-modal{max-height:calc(100vh - 24px);overflow:visible}.book-controls{grid-template-columns:42px 1fr 42px 42px;gap:8px}.icon-button{width:42px;height:42px}.lesson-card--spread{padding:34px 24px 28px}.hero h1{font-size:2.35rem}.lesson-card--tile .lesson-card__title{font-size:.92rem}.lesson-card--spread .lesson-card__title{font-size:1.82rem}.book-title-wrap h2{font-size:1.18rem}.book-spread{width:min(360px,calc(100vw - 24px));height:min(70vh,560px);min-height:480px}.book-page{padding:28px 22px}.book-page__topic{font-size:1.28rem}.book-page__copy{gap:12px;margin-bottom:18px;font-size:.9rem}.book-page__bullets{gap:10px;font-size:.8rem}.book-page__bullets li{grid-template-columns:18px 1fr}}