:root{--ink:#183746;--navy:#102f3d;--teal:#1d7776;--teal2:#155f63;--aqua:#dcefed;--cream:#f6f7f2;--gold:#efc15b;--muted:#55727c;--line:#dce5e3;--white:#fff;--radius:17px;--shadow:0 14px 35px #18374612;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.53}button,input,select{font:inherit}button{cursor:pointer}a{color:var(--teal2)}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.shell{width:min(1180px,calc(100% - 44px));margin:0 auto}.skip-link{position:absolute;top:-70px;left:12px;padding:12px;background:var(--gold);color:var(--navy);z-index:100}.skip-link:focus{top:8px}.site-header{background:var(--navy);color:white;position:relative;z-index:5;box-shadow:0 7px 20px #0e2c3920}.header-inner{min-height:99px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:white;min-width:240px}.brand-square{display:grid;place-items:center;border-radius:12px;background:var(--gold);color:var(--navy);font-size:1rem;font-weight:900;letter-spacing:.025em;width:51px;height:51px;box-shadow:inset 0 -4px 0 #d0a542}.brand-type{display:flex;flex-direction:column;line-height:1.14;gap:3px}.brand-kicker{font-size:.66rem;letter-spacing:.12em;font-weight:730;color:#bdd5df}.brand-type strong{font-size:1.63rem;letter-spacing:-.025em}.brand-type small{color:#d9dcb6;font-size:.74rem}.info-mark{font-size:.72rem;margin-left:3px}.site-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.site-nav a{color:#dce8e9;text-decoration:none;font-size:.88rem;font-weight:650;padding:11px 13px;border-radius:10px}.site-nav a:hover,.site-nav a.active{color:#fff;background:#ffffff19}.about-button{background:#e1f2f0;border:0;color:#134b55;font-weight:800;border-radius:50%;width:28px;height:28px;margin-left:8px}.app-main{min-height:68vh;padding-top:35px;padding-bottom:85px}.eyebrow{color:var(--teal2);font-weight:850;font-size:.72rem;letter-spacing:.13em;margin:0 0 9px;text-transform:uppercase}.hero{display:grid;grid-template-columns:1.08fr .92fr;gap:36px;align-items:stretch}.hero-copy{padding:53px 4px 50px 0}.hero h1{font-size:clamp(2.8rem,6.8vw,5.25rem);line-height:1.05;letter-spacing:-.055em;color:var(--navy);margin:10px 0 17px}.hero h1 em{font-style:normal;color:var(--teal)}.hero-lead{font-size:1.16rem;color:#3f616c;max-width:630px;line-height:1.75}.hero-btns,.detail-actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:26px}.btn{display:inline-flex;justify-content:center;align-items:center;gap:9px;padding:12px 18px;border-radius:11px;border:1px solid #1d7776;background:var(--teal);font-weight:780;text-decoration:none;color:#fff;transition:transform .14s ease,background .14s ease}.btn:hover{background:var(--teal2);transform:translateY(-1px)}.btn.outline{background:#fff;color:var(--teal2);border-color:#aac9c6}.btn.outline:hover{background:#e6f4f0}.btn.small{padding:9px 13px;font-size:.86rem}.cover{min-height:440px;background:linear-gradient(147deg,#103645,#174f5d 55%,#1f7a73);border-radius:23px;padding:26px;display:flex;align-items:stretch;box-shadow:0 22px 55px #0e333d38;overflow:hidden}.cover-inner{border:1px solid #ffffff66;border-radius:14px;flex:1;display:flex;flex-direction:column;padding:31px 27px;position:relative;isolation:isolate;overflow:hidden}.cover-inner:before{content:"";position:absolute;width:330px;height:330px;border:44px solid #c8e8d222;border-radius:50%;right:-170px;bottom:-150px;z-index:-1}.cover-tag{letter-spacing:.14em;color:#c5e4e4;font-size:.8rem;font-weight:720}.cover-title{margin:65px 0 0;font-size:clamp(3rem,5vw,4.8rem);line-height:.98;color:white;letter-spacing:-.055em}.cover-sub{color:#f4cd73;font-size:1rem;font-weight:700;margin-top:24px}.cover-author{margin:auto 0 0;color:#dceee8}.stat-strip{display:flex;gap:27px;flex-wrap:wrap;margin-top:26px;border-top:1px solid var(--line);padding-top:19px}.stat-strip b{font-size:1.4rem;display:block;color:var(--navy)}.stat-strip small{color:var(--muted)}.intro-note{margin-top:29px;background:white;border:1px solid var(--line);border-radius:var(--radius);padding:27px 30px;box-shadow:var(--shadow)}.intro-note p{margin:7px 0 0;color:#4e6e77}.section-heading{margin-top:58px;margin-bottom:18px;display:flex;justify-content:space-between;align-items:end;gap:12px}.section-heading h2,.page-heading h1{font-size:clamp(1.85rem,3.7vw,2.7rem);line-height:1.12;letter-spacing:-.035em;margin:4px 0;color:var(--navy)}.section-heading p,.page-heading p{color:var(--muted);margin:8px 0 0}.block-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.block-card{display:flex;flex-direction:column;text-decoration:none;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:24px;min-height:211px;box-shadow:0 7px 20px #153e4810;transition:transform .15s ease,box-shadow .15s ease}.block-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.block-num{display:inline-flex;font-size:.75rem;font-weight:800;color:var(--teal2);background:#e4f2ee;border-radius:20px;padding:5px 10px;align-self:flex-start}.block-card strong{font-size:1.16rem;line-height:1.27;margin-top:16px;color:var(--navy)}.block-card small{color:var(--muted);margin-top:8px}.block-card .block-range{margin-top:auto;padding-top:13px;color:#226a70;font-weight:750;font-size:.84rem}.page-heading{margin-bottom:25px}.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:16px}.crumbs a{text-decoration:none;font-weight:650}.course-list{display:flex;flex-direction:column;gap:23px}.block-section{background:white;border:1px solid var(--line);border-radius:19px;padding:25px 26px;box-shadow:var(--shadow)}.block-section h2{margin:0;font-size:1.34rem;line-height:1.3}.block-description{color:var(--muted);margin:8px 0 14px}.units-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:17px}.unit-card{display:flex;align-items:flex-start;gap:12px;text-decoration:none;color:var(--ink);padding:14px;border:1px solid #dce7e4;border-radius:12px;background:#fbfcfa}.unit-card:hover{border-color:#83b7ad;background:#eef8f4}.unit-num{background:#e2f0ed;border-radius:10px;padding:8px 9px;font-size:.8rem;min-width:40px;text-align:center;font-weight:860;color:#1e6f72}.unit-content{display:flex;flex-direction:column;gap:3px;min-width:0}.unit-content strong{font-weight:780}.unit-content small{color:var(--muted);font-size:.82rem;line-height:1.4}.search-controls{display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin:20px 0 21px}.search-controls input,.search-controls select{border:1px solid #b8cecd;border-radius:12px;background:#fff;color:var(--navy);padding:13px 15px;min-height:48px}.search-controls input{flex:1;min-width:220px}.search-controls select{min-width:200px}.results-count{color:var(--muted);font-size:.86rem;margin-bottom:15px}.lesson-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:19px 20px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--ink);min-height:160px;transition:border-color .15s ease,transform .15s ease}.lesson-card:hover{border-color:#5da69f;transform:translateY(-2px)}.lesson-card strong{font-size:1.03rem;line-height:1.35}.lesson-card small{color:var(--muted)}.lesson-card .lesson-arrow{font-size:.85rem;color:var(--teal2);font-weight:750;margin-top:auto}.empty{padding:35px;color:var(--muted);background:white;border-radius:15px}.load-row{text-align:center;margin-top:25px}.pill{display:inline-block;background:#e1f2ee;color:var(--teal2);font-weight:750;font-size:.8rem;border-radius:30px;padding:5px 11px}.lesson-page{max-width:900px;margin:auto}.lesson-panel{background:#fff;border:1px solid var(--line);border-radius:19px;padding:clamp(20px,5vw,39px);box-shadow:var(--shadow)}.lesson-panel h1{font-size:clamp(1.7rem,4vw,2.6rem);line-height:1.18;letter-spacing:-.025em;margin:14px 0 17px}.lesson-panel h2{font-size:1.14rem;margin:30px 0 12px;color:#1a6068}.lesson-panel p{color:#435e67}.lesson-panel ul,.lesson-panel ol{padding-left:23px;color:#385860;line-height:1.75}.lesson-panel li{padding-bottom:7px}.lesson-panel table{border-collapse:collapse;width:100%;font-size:.95rem}.lesson-panel td{padding:10px;border-bottom:1px solid var(--line);vertical-align:top}.lesson-panel td:first-child{width:40%;color:#425e65}.example-line{border-left:3px solid #94c7bb;padding:6px 13px;margin:6px 0;background:#f2f9f5;color:#214d4c}.lesson-audio{padding:17px;background:#eaf5f2;border:1px solid #c8e2dc;border-radius:12px;margin:23px 0}.lesson-audio strong{display:block;margin-bottom:9px}.lesson-audio audio{width:100%;display:block}.lesson-reminder{margin-top:25px;padding:16px;border-radius:12px;background:#fff7e6;border:1px solid #eed7a0}.unit-page{max-width:1280px;margin:0 auto}.unit-header{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 20px;display:flex;justify-content:space-between;align-items:center;gap:13px;margin-bottom:14px;flex-wrap:wrap}.unit-header h1{font-size:1.24rem;line-height:1.35;margin:2px 0}.unit-actions{display:flex;gap:7px;flex-wrap:wrap}.unit-actions a{padding:8px 12px;border-radius:9px;text-decoration:none;border:1px solid #bdd9d4;color:#21656a;font-size:.82rem;font-weight:730;background:#f8fdfa}.unit-frame-wrap{background:white;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}.unit-frame{display:block;width:100%;height:max(780px,calc(100vh - 188px));border:0;background:white}.unit-footnote{font-size:.82rem;color:var(--muted);margin-top:12px}.footer{background:#123442;color:#c4d9de;padding:26px 0}.foot-inner{display:flex;gap:14px;justify-content:space-between;flex-wrap:wrap;font-size:.8rem}.footer strong{color:white}.about-dialog{width:min(680px,calc(100vw - 30px));max-height:87vh;border:0;border-radius:19px;padding:0;box-shadow:0 24px 75px #0a2b3b80;color:var(--ink)}.about-dialog::backdrop{background:#0b2239bb}.about-head{background:#154656;color:white;padding:23px 28px;display:flex;align-items:flex-start;justify-content:space-between}.about-head .eyebrow{color:#b6e0db}.about-head h2{font-size:2rem;margin:3px 0}.about-head p{margin:5px 0;color:#d5e7df}.close-button{border:0;background:#eff6f5;color:#133f46;border-radius:50%;height:34px;width:34px;font-weight:700}.about-body{padding:22px 30px 30px;max-height:65vh;overflow:auto}.about-body h3{margin:25px 0 9px;color:#1b5862}.about-body p{color:#405e66;line-height:1.7;margin:11px 0}
@media(max-width:960px){.block-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1fr 1fr;gap:15px}.cover{min-height:390px}.hero-copy{padding-top:35px}.cover-title{margin-top:46px}.site-nav a{padding:9px}}@media(max-width:700px){.shell{width:min(100% - 28px,1180px)}.site-header{position:relative}.header-inner{display:block;padding:13px 0 12px}.brand{justify-content:flex-start}.site-nav{margin-top:17px;gap:4px}.site-nav a{padding:10px;flex:1;text-align:center;white-space:nowrap;font-size:.83rem}.about-button{margin-left:1px}.app-main{padding-top:25px}.hero{grid-template-columns:1fr}.hero-copy{padding:17px 0 15px}.hero h1{font-size:3.55rem}.hero-lead{font-size:1.02rem}.cover{min-height:270px;max-width:none}.cover-inner{padding:20px}.cover-title{font-size:3rem;margin-top:24px}.cover-author{margin-top:30px}.section-heading{margin-top:35px}.block-grid{grid-template-columns:1fr}.block-card{min-height:160px}.block-section{padding:20px}.units-grid,.lesson-list{grid-template-columns:1fr}.search-controls{flex-direction:column;align-items:stretch}.search-controls input,.search-controls select{min-width:0;width:100%}.unit-frame{height:calc(100dvh - 135px);min-height:650px}.unit-header{padding:15px}.unit-actions{width:100%}.unit-actions a{flex:1;text-align:center}.foot-inner{flex-direction:column}.intro-note{padding:20px}.about-body{padding:20px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}

/* Book header: real information control immediately beside ESPAÑOL. */
.brand-square{text-decoration:none}.brand-title{display:flex;flex-direction:column;gap:3px;color:white;text-decoration:none}.brand-kicker-row{display:flex;align-items:center;gap:6px}.header-info{display:grid;place-items:center;border:1px solid #91b7b8;border-radius:50%;background:#e4f2f2;color:#11475a;width:20px;height:20px;min-width:20px;padding:0;font-size:.71rem;font-weight:850;line-height:1}

/* INTEGRATION FIX 01 — Expanded unit view stays in the book and has a visible way home. */
body.fullpage-mode{margin:0;overflow:hidden;background:#f7faf9}
body.fullpage-mode .site-header,body.fullpage-mode .footer,body.fullpage-mode .skip-link{display:none}
body.fullpage-mode .app-main{margin:0!important;padding:0!important;width:100%!important;max-width:none!important;min-height:100dvh!important}
.fullpage-unit{height:100dvh;display:flex;flex-direction:column;min-width:0;background:white}
.fullpage-toolbar{flex:0 0 auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 14px;border-bottom:1px solid #c7ddd8;background:#123e4a;color:white;min-height:55px;box-shadow:0 2px 8px #062b3830;position:relative;z-index:3}
.fullpage-toolbar a{display:inline-flex;align-items:center;justify-content:center;min-height:37px;padding:6px 11px;border-radius:9px;border:1px solid #a1d4cb;background:#eaf8f5;color:#12535a;text-decoration:none;font-size:.86rem;font-weight:780}
.fullpage-toolbar a:hover,.fullpage-toolbar a:focus-visible{background:#fff;outline-offset:2px}
.fullpage-label{font-weight:700;color:#e1eeec;font-size:.85rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-left:auto}
.fullpage-unit .unit-frame-wrap{flex:1 1 auto;min-height:0;border:0;border-radius:0;box-shadow:none}
.fullpage-unit .unit-frame{height:100%;min-height:0;width:100%;border:0}
@media(max-width:710px){.fullpage-toolbar{gap:7px;padding:6px 9px}.fullpage-label{display:none}.fullpage-toolbar a{font-size:.78rem;min-height:40px;padding:5px 8px}.fullpage-all{margin-left:auto}}
@media(max-width:380px){.fullpage-toolbar .fullpage-all{display:none}.fullpage-toolbar{justify-content:space-between}}

/* INTEGRATION FIX 02 — Show all six units of each selected block in one vertical list.
   Keep the document's natural scroll, with no columns or pagination. */
.block-section .units-grid{grid-template-columns:minmax(0,1fr);row-gap:11px}
.block-section .unit-card{width:100%;min-width:0}