:root{
  --bg:#000;
  --bg-soft:#0b0d0a;
  --surface:#10130f;
  --surface-2:#171b15;
  --text:#fff;
  --muted:#a5aaa3;
  --accent:#baa274;
  --farm:#8fb36a;
  --line:rgba(255,255,255,.48);
  --max:1372px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Montserrat,Arial,sans-serif;
  font-size:16px;
  font-weight:300;
  line-height:1.75;
}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
img{max-width:100%}
.container{width:calc(100% - 52px);max-width:var(--max);margin:0 auto}

/* ===== HEADER : mirrors the uploaded WEB.zip structure ===== */
.main-header{
  position:absolute;
  left:0;top:0;width:100%;
  z-index:50;
  padding:37px 0;
  transition:.35s ease;
}
.main-header::before{
  content:"";
  position:absolute;
  left:50%;bottom:1px;
  transform:translateX(-50%);
  width:calc(100% - 52px);
  max-width:1600px;
  height:.5px;
  background:var(--line);
}
.header-grid{
  display:grid;
  grid-template-columns:1fr 220px 1fr;
  align-items:center;
  gap:28px;
}
.header-menu{
  display:flex;
  align-items:center;
  gap:2.5rem;
  list-style:none;
  padding:0;margin:0;
}
.header-menu.right{justify-content:flex-end}
.header-menu a{
  display:inline-block;
  padding:5px 0;
  color:#fff;
  font-size:12px;
  font-weight:500;
  line-height:15px;
  transition:.2s ease;
  white-space:nowrap;
}
.header-menu a:hover,
.header-menu a.active{
  color:var(--accent);
  text-shadow:.5px 0 0 var(--accent);
}
.brand{
  text-align:center;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  line-height:1;
}
.brand-logo{
  font-size:26px;
  font-weight:700;
  letter-spacing:4.5px;
}
.brand-logo em{
  color:var(--farm);
  font-style:normal;
}
.brand-sub{
  font-size:8px;
  margin-top:7px;
  color:#d6d6d6;
  letter-spacing:2.6px;
  text-transform:uppercase;
}
.mobile-toggle{
  display:none;
  border:0;
  color:#fff;
  background:transparent;
  font-size:28px;
  cursor:pointer;
}

/* ===== MAIN ===== */
.site-main{min-height:500px}
.catalogue-stage{
  background:#000;
  padding:185px 0 96px;
}
.page-title{
  text-align:center;
  margin:0 0 65px;
}
.page-title h1{
  color:var(--accent);
  font-size:40px;
  font-weight:300;
  line-height:1.35;
  margin:0;
  letter-spacing:.02em;
}
.page-title p{
  margin:14px auto 0;
  max-width:760px;
  color:#b5b5b5;
  font-size:14px;
}
.section-kicker{
  text-transform:uppercase;
  letter-spacing:3.5px;
  font-size:12px;
  color:var(--farm);
  margin-bottom:8px;
}

/* catalogue-like course covers */
.book-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:46px 34px;
  align-items:start;
}
.book{
  cursor:pointer;
}
.book-cover{
  position:relative;
  aspect-ratio: .72 / 1;
  overflow:hidden;
  background:#111;
  box-shadow:0 14px 34px rgba(0,0,0,.35);
  border:1px solid #282828;
  transition:transform .28s ease, box-shadow .28s ease;
}
.book:hover .book-cover{
  transform:translateY(-8px);
  box-shadow:0 24px 50px rgba(0,0,0,.55);
}
.book-cover::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,transparent 38%,rgba(0,0,0,.76) 100%);
  pointer-events:none;
}
.cover-art{
  position:absolute;
  inset:0;
  overflow:hidden;
}
.cover-art::before,
.cover-art::after{
  content:"";
  position:absolute;
  border-radius:999px;
  filter:blur(.2px);
}
.cover-art::before{
  width:125%;height:48%;
  left:-18%;bottom:10%;
  background:linear-gradient(155deg,rgba(143,179,106,.95),rgba(45,88,47,.9));
  transform:rotate(-6deg);
}
.cover-art::after{
  width:72%;height:72%;
  right:-28%;top:-20%;
  border:1px solid rgba(255,255,255,.18);
  background:radial-gradient(circle at 35% 35%,rgba(186,162,116,.72),rgba(186,162,116,.02) 68%);
}
.cover-art.c2::before{background:linear-gradient(155deg,#557058,#21372d)}
.cover-art.c3::before{background:linear-gradient(155deg,#366d6f,#17363d)}
.cover-art.c4::before{background:linear-gradient(155deg,#817448,#453b22)}
.cover-art.c5::before{background:linear-gradient(155deg,#7d9d63,#294631)}
.cover-art.c6::before{background:linear-gradient(155deg,#44708f,#1f3542)}
.cover-art.c7::before{background:linear-gradient(155deg,#8b633c,#472f1c)}
.cover-art.c8::before{background:linear-gradient(155deg,#5d7d86,#233c45)}
.cover-art.c9::before{background:linear-gradient(155deg,#5e646c,#262b31)}
.cover-art.c10::before{background:linear-gradient(155deg,#678d56,#263e25)}
.cover-no{
  position:absolute;
  top:19px;left:20px;
  z-index:2;
  font-size:12px;
  letter-spacing:2px;
  color:rgba(255,255,255,.72);
}
.cover-icon{
  position:absolute;
  z-index:2;
  top:29%;left:50%;
  transform:translate(-50%,-50%);
  font-size:54px;
  filter:grayscale(.25);
}
.cover-copy{
  position:absolute;
  z-index:3;
  left:20px;right:20px;bottom:22px;
}
.cover-copy small{
  display:block;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:2px;
  font-size:9px;
  margin-bottom:5px;
}
.cover-copy strong{
  display:block;
  color:#fff;
  font-size:22px;
  line-height:1.27;
  font-weight:400;
}
.book-meta{
  text-align:center;
  padding:15px 8px 0;
}
.book-meta h3{
  font-size:13px;
  line-height:1.55;
  font-weight:400;
  margin:0;
  color:#fff;
}
.book-meta span{
  display:block;
  font-size:11px;
  color:#777;
  margin-top:4px;
}
.progress-line{
  height:2px;
  background:#242424;
  margin:10px auto 0;
  max-width:150px;
}
.progress-line i{
  display:block;height:100%;
  background:var(--accent);
}

/* ===== LESSON ===== */
.lesson-stage{
  padding:175px 0 100px;
}
.lesson-hero{
  display:grid;
  grid-template-columns:36% 1fr;
  gap:74px;
  align-items:center;
  padding-bottom:70px;
  border-bottom:1px solid rgba(255,255,255,.16);
}
.lesson-poster{
  aspect-ratio:.72/1;
  max-width:390px;
  position:relative;
  overflow:hidden;
  border:1px solid #2a2a2a;
  background:linear-gradient(150deg,#182317,#0c0e0c);
}
.lesson-poster .cover-art{inset:0}
.lesson-poster .cover-icon{font-size:82px}
.lesson-poster .cover-copy strong{font-size:31px}
.lesson-copy .lesson-label{
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:3px;
  font-size:12px;
}
.lesson-copy h1{
  font-size:52px;
  line-height:1.15;
  font-weight:300;
  margin:14px 0 18px;
}
.lesson-copy p{color:#b7b7b7;max-width:760px}
.lesson-actions{
  display:flex;
  gap:20px;
  align-items:center;
  margin-top:28px;
  flex-wrap:wrap;
}
.link-button{
  color:var(--accent);
  border:0;
  border-bottom:1px solid var(--accent);
  background:transparent;
  padding:3px 0 7px;
  font-size:16px;
  cursor:pointer;
}
.link-button:hover{color:#fff;border-color:#fff}
.lesson-content{
  display:grid;
  grid-template-columns:280px 1fr;
  gap:55px;
  padding-top:70px;
}
.lesson-nav{
  position:sticky;
  top:30px;
  align-self:start;
}
.lesson-nav h4{
  color:var(--accent);
  font-weight:400;
  margin:0 0 18px;
  font-size:13px;
  text-transform:uppercase;
  letter-spacing:2px;
}
.lesson-nav a{
  display:block;
  padding:10px 0;
  border-bottom:1px solid #222;
  color:#8d8d8d;
  font-size:13px;
}
.lesson-nav a:hover,.lesson-nav a.active{color:#fff}
.lesson-article h2{
  font-size:34px;
  font-weight:300;
  line-height:1.3;
  margin:0 0 18px;
}
.lesson-article p{color:#b0b0b0}
.info-block{
  border:1px solid #242424;
  background:#0c0e0c;
  padding:26px;
  margin:28px 0;
}
.flow{
  display:grid;
  grid-template-columns:repeat(7,auto);
  justify-content:center;
  align-items:center;
  gap:10px;
  padding:30px 18px;
  margin:30px 0;
  border-top:1px solid #242424;
  border-bottom:1px solid #242424;
}
.flow .node{
  border:1px solid #333;
  padding:10px 14px;
  color:#fff;
  font-size:12px;
}
.flow .arrow{color:var(--accent)}
.simulator{
  margin-top:30px;
  border:1px solid #2c2c2c;
  padding:28px;
  background:#0b0e0b;
}
.simulator input[type=range]{width:100%;accent-color:var(--accent)}
.sim-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:#292929;
  margin-top:25px;
}
.sim-box{
  background:#111;
  padding:22px;
}
.sim-box span{
  color:#777;
  font-size:10px;
  text-transform:uppercase;
  letter-spacing:1.8px;
}
.sim-box strong{
  display:block;
  margin-top:6px;
  font-size:28px;
  font-weight:300;
}

/* ===== QUIZ ===== */
.quiz-wrap{
  width:min(920px,100%);
  margin:0 auto;
}
.quiz-question{
  padding:30px 0;
  border-bottom:1px solid #242424;
}
.quiz-question h3{
  font-size:20px;
  font-weight:400;
  line-height:1.6;
  margin:0 0 16px;
}
.quiz-option{
  display:block;
  padding:9px 0;
  color:#bdbdbd;
  cursor:pointer;
}
.quiz-option input{margin-right:9px;accent-color:var(--accent)}
.quiz-result{
  display:none;
  margin-top:30px;
  padding:22px;
  border:1px solid var(--accent);
  color:var(--accent);
}

/* ===== FOOTER : mirrors the uploaded WEB.zip hierarchy ===== */
.footer-content{
  position:relative;
  background:
    radial-gradient(circle at 14% 35%,rgba(86,112,70,.36),transparent 28%),
    radial-gradient(circle at 84% 44%,rgba(92,78,47,.35),transparent 28%),
    linear-gradient(135deg,#1b2418,#080a08);
}
.footer-content::before{
  content:"";
  position:absolute;inset:0;
  background:#000;
  opacity:.52;
}
.footer-inner{position:relative;z-index:2}
.footer-top{
  display:grid;
  grid-template-columns:1fr 1fr;
  padding:62px 0 48px;
  align-items:end;
}
.footer-brand .brand{
  align-items:flex-start;
  text-align:left;
}
.socials{
  display:flex;
  gap:16px;
  margin-top:26px;
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:1px;
}
.footer-contact{
  text-align:right;
  color:#fff;
}
.footer-contact p{margin:4px 0}
.footer-bottom{
  display:grid;
  grid-template-columns:1.25fr .75fr;
  gap:50px;
  padding:38px 0 56px;
  border-top:1px solid rgba(255,255,255,.25);
}
.footer-menu{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px 24px;
}
.footer-menu a{
  font-size:12px;
  color:#fff;
}
.footer-menu a:hover{color:var(--accent)}
.newsletter label{
  display:block;
  color:#fff;
  font-size:13px;
  margin-bottom:12px;
}
.newsletter-row{
  display:flex;
  align-items:center;
  border-bottom:1px solid #fff;
}
.newsletter input{
  width:100%;
  background:transparent;
  border:0;
  outline:0;
  color:#fff;
  padding:13px 0;
}
.newsletter button{
  border:0;background:transparent;color:var(--accent);cursor:pointer;
}
.footer-legal{
  display:flex;
  justify-content:space-between;
  gap:24px;
  padding:18px 0 25px;
  border-top:1px solid rgba(255,255,255,.18);
  color:#9f9f9f;
  font-size:10px;
}
.footer-legal-links{display:flex;gap:18px}

/* ===== RESPONSIVE ===== */
@media(max-width:1399px){
  :root{--max:1187px}
  .main-header{padding:19px 0}
  .header-menu{gap:1rem}
}
@media(max-width:1100px){
  .book-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:991px){
  .container{width:calc(100% - 42px)}
  .main-header{padding:23px 0}
  .main-header::before{display:none}
  .header-grid{
    grid-template-columns:54px 1fr 54px;
  }
  .header-left,.header-right{display:none}
  .mobile-toggle{display:block}
  .brand-logo{font-size:22px}
  .mobile-panel{
    display:none;
    position:absolute;
    top:82px;left:0;right:0;
    height:calc(100vh - 82px);
    overflow:auto;
    background:linear-gradient(to right,#000,rgba(0,0,0,.84));
    padding:24px 36px;
  }
  .mobile-panel.open{display:block}
  .mobile-panel a{
    display:block;
    padding:14px 0;
    color:#fff;
    border-bottom:1px solid rgba(255,255,255,.12);
    font-size:18px;
  }
  .catalogue-stage{padding-top:145px}
  .book-grid{grid-template-columns:repeat(2,1fr);gap:34px 24px}
  .lesson-hero{grid-template-columns:1fr;gap:38px}
  .lesson-poster{margin:auto}
  .lesson-content{grid-template-columns:1fr}
  .lesson-nav{position:static}
  .footer-top,.footer-bottom{grid-template-columns:1fr}
  .footer-contact{text-align:left;margin-top:28px}
}
@media(max-width:575px){
  .container{width:calc(100% - 34px)}
  .page-title{margin-bottom:42px}
  .page-title h1{font-size:32px}
  .book-grid{grid-template-columns:1fr 1fr;gap:28px 14px}
  .book-meta h3{font-size:11px}
  .cover-copy{left:12px;right:12px;bottom:14px}
  .cover-copy strong{font-size:15px}
  .cover-copy small{font-size:7px}
  .cover-no{top:12px;left:12px}
  .cover-icon{font-size:38px}
  .lesson-copy h1{font-size:38px}
  .lesson-content{padding-top:45px}
  .flow{grid-template-columns:1fr;text-align:center}
  .flow .arrow{transform:rotate(90deg)}
  .sim-grid{grid-template-columns:1fr}
  .footer-menu{grid-template-columns:1fr 1fr}
  .footer-legal{flex-direction:column}
}

/* ===== CATALOG / PDF FLIPBOOK ===== */
.catalog-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:54px 38px;
  align-items:start;
  max-width:1060px;
  margin:0 auto;
}
.catalog-book{display:block;text-align:center}
.catalog-cover{
  position:relative;
  aspect-ratio:.707/1;
  background:#111;
  border:1px solid #272727;
  overflow:hidden;
  box-shadow:0 18px 46px rgba(0,0,0,.5);
  transition:.3s ease;
}
.catalog-cover::after{
  content:"OPEN BOOK";
  position:absolute;
  left:50%;top:50%;
  transform:translate(-50%,-42%);
  opacity:0;
  padding:10px 16px;
  border:1px solid rgba(255,255,255,.75);
  color:#fff;
  font-size:10px;
  letter-spacing:2px;
  background:rgba(0,0,0,.55);
  transition:.25s ease;
  white-space:nowrap;
}
.catalog-cover img{width:100%;height:100%;object-fit:cover;display:block;transition:.35s ease}
.catalog-book:hover .catalog-cover{transform:translateY(-8px);box-shadow:0 28px 58px rgba(0,0,0,.68)}
.catalog-book:hover .catalog-cover img{transform:scale(1.025);filter:brightness(.64)}
.catalog-book:hover .catalog-cover::after{opacity:1;transform:translate(-50%,-50%)}
.catalog-book h3{font-size:14px;font-weight:400;margin:16px 0 3px;color:#fff}
.catalog-book p{font-size:11px;color:#777;margin:0}
.catalog-note{
  max-width:1060px;
  margin:46px auto 0;
  padding-top:24px;
  border-top:1px solid #202020;
  color:#7e7e7e;
  font-size:12px;
  text-align:center;
}

.flipbook-page{
  margin:0;
  min-height:100vh;
  background:#242424;
  overflow:hidden;
  color:#fff;
}
.flipbook-app{
  min-height:100vh;
  display:grid;
  grid-template-rows:58px 1fr 70px;
  background:
    radial-gradient(circle at 50% 44%,rgba(255,255,255,.07),transparent 38%),
    #242424;
}
.flip-topbar,
.flip-toolbar{
  display:flex;
  align-items:center;
  gap:12px;
  padding:0 18px;
  background:rgba(17,17,17,.94);
  border-color:#353535;
  z-index:30;
}
.flip-topbar{border-bottom:1px solid #353535}
.flip-toolbar{border-top:1px solid #353535;justify-content:center}
.flip-title{
  min-width:0;
  flex:1;
  text-align:center;
  font-size:13px;
  color:#d7d7d7;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.flip-control{
  border:0;
  background:transparent;
  color:#d6d6d6;
  min-width:38px;
  height:38px;
  border-radius:8px;
  cursor:pointer;
  display:grid;
  place-items:center;
  font-size:17px;
}
.flip-control:hover{background:#323232;color:#fff}
.flip-control[disabled]{opacity:.32;cursor:not-allowed}
.flip-back{font-size:13px;width:auto;padding:0 10px;text-decoration:none}
.flip-page-number{min-width:106px;text-align:center;font-size:12px;color:#b8b8b8}
.flip-viewer{
  position:relative;
  min-height:0;
  overflow:auto;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px 42px;
  perspective:2200px;
}
.book-stage{
  position:relative;
  width:min(1080px,88vw);
  height:min(76vh,760px);
  display:flex;
  justify-content:center;
  align-items:center;
  transform-origin:center center;
  transition:transform .2s ease;
}
.book-spread{
  position:relative;
  display:flex;
  justify-content:center;
  align-items:stretch;
  height:100%;
  max-width:100%;
  filter:drop-shadow(0 22px 25px rgba(0,0,0,.48));
  transform-style:preserve-3d;
}
.book-spread::before{
  content:"";
  position:absolute;
  left:50%;top:0;bottom:0;
  width:18px;
  transform:translateX(-50%);
  z-index:8;
  pointer-events:none;
  background:linear-gradient(90deg,rgba(0,0,0,.22),rgba(255,255,255,.08),rgba(0,0,0,.25));
  opacity:.7;
}
.page-pane{
  position:relative;
  height:100%;
  aspect-ratio:.707/1;
  background:#f5f5f5;
  overflow:hidden;
  backface-visibility:hidden;
}
.page-pane.left{box-shadow:inset -16px 0 22px -22px #000}
.page-pane.right{box-shadow:inset 16px 0 22px -22px #000}
.page-pane.blank{background:transparent;box-shadow:none}
.page-pane.blank canvas{display:none}
.page-pane canvas{width:100%;height:100%;display:block;background:#fff}
.page-edge{
  position:absolute;
  top:0;bottom:0;width:17%;
  z-index:12;
  cursor:pointer;
}
.page-edge.prev{left:0}
.page-edge.next{right:0}
.flip-sheet{
  position:absolute;
  top:0;
  height:100%;
  width:50%;
  z-index:20;
  background-size:100% 100%;
  background-repeat:no-repeat;
  background-color:#fff;
  backface-visibility:hidden;
  transform-style:preserve-3d;
  box-shadow:0 10px 30px rgba(0,0,0,.35);
  pointer-events:none;
}
.flip-sheet::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(0,0,0,.12),transparent 35%,rgba(0,0,0,.08));
}
.flip-sheet.next{right:0;transform-origin:left center;animation:turnNext .68s cubic-bezier(.2,.65,.25,1) forwards}
.flip-sheet.prev{left:0;transform-origin:right center;animation:turnPrev .68s cubic-bezier(.2,.65,.25,1) forwards}
@keyframes turnNext{
  0%{transform:rotateY(0deg)}
  52%{filter:brightness(.88)}
  100%{transform:rotateY(-180deg);filter:brightness(.7)}
}
@keyframes turnPrev{
  0%{transform:rotateY(0deg)}
  52%{filter:brightness(.88)}
  100%{transform:rotateY(180deg);filter:brightness(.7)}
}
.flip-loading{
  position:absolute;inset:0;
  display:grid;place-items:center;
  background:#242424;
  z-index:40;
  color:#bbb;
  font-size:13px;
  letter-spacing:1px;
}
.flip-loading.hidden{display:none}
.flip-error{
  max-width:620px;
  text-align:center;
  color:#ddd;
  padding:28px;
  border:1px solid #444;
  background:#1b1b1b;
  line-height:1.8;
}
.flip-error a{color:var(--accent);text-decoration:underline}
.zoom-label{font-size:11px;color:#888;min-width:38px;text-align:center}

@media(max-width:900px){
  .catalog-grid{grid-template-columns:repeat(2,1fr);gap:40px 24px}
  .flip-title{text-align:left}
  .book-stage{height:min(72vh,700px);width:min(94vw,620px)}
  .book-spread::before{display:none}
  .page-pane.left{display:none}
  .page-pane.right{height:100%}
  .flip-sheet{width:100%;left:0!important;right:0!important}
  .flip-sheet.next{transform-origin:left center}
  .flip-sheet.prev{transform-origin:right center}
}
@media(max-width:575px){
  .catalog-grid{grid-template-columns:1fr 1fr;gap:30px 14px}
  .catalog-book h3{font-size:11px;line-height:1.45}
  .catalog-book p{font-size:9px}
  .flipbook-app{grid-template-rows:52px 1fr 64px}
  .flip-topbar,.flip-toolbar{padding:0 8px;gap:4px}
  .flip-viewer{padding:12px 8px}
  .flip-title{font-size:11px}
  .flip-control{min-width:34px;height:34px}
  .flip-page-number{min-width:80px;font-size:10px}
  .book-stage{height:min(72vh,640px);width:96vw}
}

/* ===== REAL SHEET FLIPBOOK (TEST.zip / DearFlip-like interaction) ===== */
.flipbook-lock{overflow:hidden!important}
.real-flipbook-overlay{
  position:fixed;inset:0;z-index:9999;
  display:grid;grid-template-rows:58px 1fr 64px;
  background:radial-gradient(circle at 50% 42%,#3d3d3d 0,#242424 38%,#171717 100%);
  color:#fff;opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .22s ease;
}
.real-flipbook-overlay.open{opacity:1;visibility:visible;pointer-events:auto}
.real-flipbook-overlay[data-standalone="true"]{position:fixed;opacity:1;visibility:visible;pointer-events:auto}
.real-topbar,.real-toolbar{
  background:rgba(12,12,12,.94);display:flex;align-items:center;gap:8px;
  padding:0 14px;border-color:#3a3a3a;z-index:30
}
.real-topbar{border-bottom:1px solid #343434}
.real-toolbar{border-top:1px solid #343434;justify-content:center}
.real-title{flex:1;text-align:center;color:#d7d7d7;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.real-btn{
  appearance:none;border:0;background:transparent;color:#d7d7d7;height:38px;min-width:38px;
  border-radius:7px;display:inline-grid;place-items:center;cursor:pointer;font-size:16px
}
.real-btn:hover{background:#313131;color:#fff}.real-btn:disabled{opacity:.28;cursor:not-allowed}
.real-close{font-size:24px}.real-pdf-link{text-decoration:none;font-size:12px;padding:0 8px;width:auto}
.real-viewer-area{position:relative;min-height:0;overflow:auto;display:flex;align-items:center;justify-content:center;padding:16px 28px}
.real-book-stage{position:relative;display:grid;place-items:center;perspective:2400px;touch-action:none;user-select:none}
.real-book-stage.dragging{cursor:grabbing}
.real-book{
  position:relative;transform-style:preserve-3d;transform-origin:center center;
  filter:drop-shadow(0 26px 26px rgba(0,0,0,.55));transition:transform .18s ease
}
.real-book::before{
  content:"";position:absolute;z-index:500;left:50%;top:0;bottom:0;width:14px;transform:translateX(-50%);
  background:linear-gradient(90deg,rgba(0,0,0,.24),rgba(255,255,255,.06),rgba(0,0,0,.3));pointer-events:none;opacity:.82
}
.paper-sheet{
  position:absolute;right:0;top:0;width:50%;height:100%;transform-origin:left center;transform-style:preserve-3d;
  transform:rotateY(0deg);will-change:transform;cursor:grab
}
.paper-sheet::after{
  content:"";position:absolute;inset:0;pointer-events:none;backface-visibility:hidden;
  box-shadow:inset 18px 0 28px -28px rgba(0,0,0,.8),0 4px 16px rgba(0,0,0,.25)
}
.paper-face{position:absolute;inset:0;background:#fff;overflow:hidden;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.paper-face img{width:100%;height:100%;display:block;object-fit:fill;pointer-events:none;user-select:none;-webkit-user-drag:none}
.paper-front{box-shadow:inset 14px 0 24px -24px rgba(0,0,0,.9)}
.paper-back{transform:rotateY(180deg);box-shadow:inset -14px 0 24px -24px rgba(0,0,0,.9)}
.paper-blank{background:linear-gradient(90deg,#f4f1e8,#fff)}
.paper-page-no{position:absolute;bottom:8px;right:11px;color:rgba(0,0,0,.42);font:10px/1 Arial,sans-serif;background:rgba(255,255,255,.65);padding:4px 5px;border-radius:3px}
.paper-back .paper-page-no{right:auto;left:11px}
.real-book::after{
  content:"";position:absolute;left:50%;top:1.5%;bottom:1.5%;width:50%;pointer-events:none;z-index:450;
  background:linear-gradient(90deg,rgba(0,0,0,.12),transparent 12%);opacity:calc(.18 + var(--drag-shadow,0))
}
.real-loading{position:absolute;inset:0;display:grid;place-items:center;background:#242424;z-index:800;color:#c7c7c7;font-size:13px;letter-spacing:.4px}
.real-loading.hidden{display:none}
.real-page-number{min-width:112px;text-align:center;color:#bcbcbc;font-size:12px}
.real-zoom-label{min-width:42px;text-align:center;color:#909090;font-size:10px}
.real-thumbs{
  position:absolute;z-index:50;left:0;top:0;bottom:0;width:260px;background:rgba(18,18,18,.97);border-right:1px solid #3a3a3a;
  padding:16px 12px;overflow:auto;display:grid;grid-template-columns:1fr 1fr;align-content:start;gap:12px;
  transform:translateX(-100%);transition:transform .25s ease
}
.thumbs-open .real-thumbs{transform:translateX(0)}
.real-thumb{border:1px solid #353535;background:#111;padding:5px;cursor:pointer;color:#aaa;position:relative}
.real-thumb:hover,.real-thumb.active{border-color:var(--accent);color:#fff}.real-thumb img{width:100%;display:block}.real-thumb span{display:block;text-align:center;font-size:9px;padding:4px 0 1px}
.real-help{position:absolute;z-index:20;left:50%;bottom:18px;transform:translateX(-50%);padding:7px 12px;border-radius:99px;background:rgba(0,0,0,.48);color:#bcbcbc;font-size:10px;pointer-events:none;opacity:.9}

@media(max-width:900px){
  .real-flipbook-overlay{grid-template-rows:52px 1fr 60px}
  .real-title{text-align:left;font-size:11px}.real-viewer-area{padding:10px 4px}.real-topbar,.real-toolbar{padding:0 6px;gap:2px}
  .real-btn{min-width:34px;height:34px}.real-page-number{min-width:86px;font-size:10px}.real-thumbs{width:210px}
  .real-help{display:none}
}

/* PDF.js pages used by the real flipbook */
.pdf-page-canvas,
.thumb-canvas{display:block;background:#fff}
.pdf-page-canvas{width:100%;height:100%}
.thumb-canvas{width:100%;height:auto}
.real-loading.error{padding:30px;text-align:center;line-height:1.8}
.real-loading.error a{color:var(--accent);text-decoration:underline}