:root{
  --navy:#0d4067;
  --blue:#1784bd;
  --cyan:#72c7e7;
  --pale:#eef9fd;
  --ink:#173b57;
  --muted:#6d8392;
  --line:#dbeaf1;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,Helvetica,sans-serif;
  color:var(--ink);
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit}
#home,#authors-contact,#books,#feedback{scroll-margin-top:104px}

.site-header{
  position:sticky;
  top:0;
  z-index:20;
  background:rgba(255,255,255,.965);
  backdrop-filter:blur(9px);
  border-bottom:1px solid #edf3f6;
}
.header-inner{
  width:min(1200px,calc(100% - 44px));
  margin:auto;
  min-height:88px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:34px;
}
.brand img{width:232px;height:auto}
.nav{
  display:flex;
  align-items:center;
  gap:29px;
  font-size:14px;
  font-weight:700;
  white-space:nowrap;
}
.nav a{
  text-decoration:none;
  padding:33px 0 29px;
  border-bottom:2px solid transparent;
}
.nav a:hover,.nav a:focus{color:var(--blue);border-bottom-color:var(--blue)}

.hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(circle at 78% 38%,rgba(255,255,255,.98) 0 12%,rgba(255,255,255,.62) 31%,transparent 53%),
    radial-gradient(circle at 8% 12%,rgba(104,199,234,.24),transparent 43%),
    linear-gradient(106deg,#fbfeff 0%,#eaf7fc 50%,#fffefa 100%);
}
.hero:before{
  content:"";
  position:absolute;
  width:460px;height:460px;
  border:2px solid rgba(83,180,218,.10);
  border-radius:50%;
  left:-285px;top:-210px;
  box-shadow:120px 130px 0 -2px rgba(83,180,218,.06);
}
.hero-inner{
  position:relative;
  z-index:2;
  width:min(1200px,calc(100% - 44px));
  margin:auto;
  min-height:475px;
  display:grid;
  grid-template-columns:1.02fr .98fr;
  align-items:center;
  gap:42px;
  padding:50px 0 54px;
}
.hero-copy h1{
  margin:0;
  font-family:Georgia,"Times New Roman",serif;
  font-weight:500;
  font-size:clamp(51px,5.4vw,76px);
  line-height:.98;
  letter-spacing:-.037em;
  color:#123f67;
}
.hero-copy h1 span{display:block;color:#1784bd}
.hero-rule{width:53px;height:3px;background:#6bc4e7;margin:25px 0 18px}
.hero-copy p{
  margin:0;
  max-width:535px;
  font-family:Georgia,"Times New Roman",serif;
  font-size:18px;
  line-height:1.55;
  color:#3c5f76;
}
.hero-books{
  position:relative;
  min-height:345px;
  display:flex;
  align-items:flex-end;
  justify-content:center;
  padding:18px 0 8px;
}
.hero-books:after{
  content:"";
  position:absolute;
  left:9%;right:4%;bottom:3px;height:28px;
  border-radius:50%;
  background:rgba(9,61,97,.12);
  filter:blur(19px);
}
.hero-book{
  position:relative;
  z-index:3;
  width:148px;
  aspect-ratio:.62;
  object-fit:cover;
  border-radius:4px;
  border:1px solid rgba(18,63,103,.12);
  background:white;
  box-shadow:0 20px 35px rgba(18,63,103,.20);
  transform-origin:bottom center;
}
.hero-book-1{transform:rotate(-8deg) translate(45px,18px);z-index:1}
.hero-book-2{transform:rotate(-3deg) translate(18px,3px);z-index:2}
.hero-book-3{transform:rotate(3deg) translate(-8px,0);z-index:4}
.hero-book-4{transform:rotate(8deg) translate(-36px,19px);z-index:2}

.author-band{
  background:linear-gradient(90deg,#ecf8fd 0%,#f9fdff 52%,#ecf8fd 100%);
  border-bottom:1px solid #deedf3;
}
.author-inner{
  width:min(1200px,calc(100% - 44px));
  margin:auto;
  display:grid;
  grid-template-columns:82px 1fr auto;
  gap:24px;
  align-items:center;
  padding:26px 0;
}
.mail-icon{
  width:68px;height:68px;
  border-radius:50%;
  background:#d8f0fa;
  display:grid;place-items:center;
  color:#0c689f;
  font-size:31px;
}
.author-inner h2{
  margin:0 0 7px;
  font-family:Georgia,"Times New Roman",serif;
  color:#123f67;
  font-size:27px;
  font-weight:500;
}
.author-inner p{margin:0;color:#476578;line-height:1.5;font-size:15px;max-width:720px}
.email-display{font-size:18px;font-weight:700;color:#0d75ae;white-space:nowrap;text-decoration:none}
.email-display:hover,.email-display:focus{text-decoration:underline}

.section-wrap{border-bottom:1px solid #edf3f6}
.books-wrap{background:linear-gradient(180deg,#fff 0%,#fffefa 100%)}
.feedback-wrap{
  background:linear-gradient(90deg,rgba(233,248,253,.88),rgba(255,255,255,.96) 50%,rgba(233,248,253,.88));
}
.section{
  width:min(1200px,calc(100% - 44px));
  margin:auto;
  padding:62px 0 66px;
}
.section-head{
  display:flex;
  justify-content:space-between;
  align-items:end;
  gap:28px;
  margin-bottom:31px;
}
.section h2{
  margin:0;
  font-family:Georgia,"Times New Roman",serif;
  font-weight:500;
  font-size:39px;
  letter-spacing:-.02em;
  color:#123f67;
}
.section-note{max-width:430px;font-size:14px;line-height:1.55;color:#718794}

.book-grid{
  display:grid;
  grid-template-columns:repeat(8,1fr);
  gap:18px;
  align-items:start;
}
.book-card{min-width:0;text-align:center}
.cover-frame{
  width:100%;
  aspect-ratio:.625;
  background:#f8fafb;
  border-radius:4px;
  box-shadow:0 13px 25px rgba(20,61,87,.12);
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
}
.cover-frame img{width:100%;height:100%;object-fit:cover}
.book-title{
  margin:12px 3px 4px;
  font-family:Georgia,"Times New Roman",serif;
  font-size:14px;
  line-height:1.23;
  color:#173f5d;
}
.book-author{font-size:11px;line-height:1.25;color:#768994}

.feedback-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.quote{
  min-height:226px;
  padding:28px 30px 25px;
  background:rgba(255,255,255,.94);
  border:1px solid #e0edf2;
  border-radius:14px;
  box-shadow:0 9px 22px rgba(20,69,97,.05);
}
.quote-mark{
  height:30px;
  font-family:Georgia,serif;
  font-size:60px;
  line-height:.62;
  color:#9dd9ef;
}
.quote blockquote{
  margin:17px 0 22px;
  font-family:Georgia,"Times New Roman",serif;
  color:#2d4e63;
  font-size:17px;
  line-height:1.55;
}
.quote strong{display:block;color:#123f67;font-size:14px}
.quote small{display:block;margin-top:4px;color:#788b98;font-style:italic}

.footer{
  background:linear-gradient(100deg,#0b527f,#07517d 62%,#073f67);
  color:white;
}
.footer-inner{
  width:min(1200px,calc(100% - 44px));
  margin:auto;
  min-height:150px;
  padding:32px 0;
  display:grid;
  grid-template-columns:255px 1fr auto;
  gap:34px;
  align-items:center;
}
.footer-logo img{width:202px;filter:brightness(0) invert(1);opacity:.98}
.footer-nav{display:flex;justify-content:center;gap:23px;flex-wrap:wrap;font-size:13px;color:#dceef6}
.footer-nav a{text-decoration:none}
.footer-contact{text-align:right;color:#d4eaf4;font-size:13px;line-height:1.65}
.footer-contact strong{color:white}
.footer-contact a{color:inherit;text-decoration:none}
.footer-contact a:hover,.footer-contact a:focus{text-decoration:underline}
.privacy-email{color:#0d75ae;font-weight:700;text-decoration:none}
.privacy-email:hover,.privacy-email:focus{text-decoration:underline}

/* Privacy page */
.privacy-hero{
  background:linear-gradient(110deg,#eef9fd,#fffefa);
  border-bottom:1px solid var(--line);
}
.privacy-hero-inner{
  width:min(980px,calc(100% - 44px));
  margin:auto;
  padding:52px 0 44px;
}
.privacy-hero h1{
  margin:0 0 10px;
  font-family:Georgia,"Times New Roman",serif;
  font-size:48px;
  font-weight:500;
  color:#123f67;
}
.privacy-hero p{margin:0;color:#68808f}
.privacy-content{
  width:min(980px,calc(100% - 44px));
  margin:auto;
  padding:48px 0 64px;
  line-height:1.66;
  color:#334f62;
}
.privacy-content h2{
  font-family:Georgia,"Times New Roman",serif;
  font-size:27px;
  font-weight:500;
  color:#123f67;
  margin:38px 0 12px;
}
.privacy-content h2:first-child{margin-top:0}
.privacy-content p{margin:0 0 14px}
.privacy-content ul{padding-left:22px}
.privacy-content li{margin:7px 0}
.privacy-content strong{color:#183e5c}
.company-box{
  margin-top:42px;
  padding:20px 22px;
  border:1px solid #dbeaf1;
  border-radius:10px;
  background:#f8fcfe;
  font-size:14px;
}
.back-link{
  display:inline-block;
  margin-top:24px;
  font-weight:700;
  color:#0d75ae;
  text-decoration:none;
}
.back-link:hover{text-decoration:underline}

@media(max-width:1100px){
  .book-grid{grid-template-columns:repeat(4,1fr);gap:28px 24px}
}
@media(max-width:900px){
  .header-inner{min-height:78px}
  .brand img{width:200px}
  .nav{gap:17px;font-size:12px}
  .nav a{padding:27px 0 24px}
  .hero-inner{grid-template-columns:1fr;padding:44px 0 34px}
  .hero-books{justify-content:flex-start;min-height:285px;margin-left:-17px}
  .hero-book{width:120px}
  .author-inner{grid-template-columns:68px 1fr}
  .email-display{grid-column:2}
  .feedback-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr;gap:20px}
  .footer-nav{justify-content:flex-start}
  .footer-contact{text-align:left}
}
@media(max-width:650px){
  #home,#authors-contact,#books,#feedback{scroll-margin-top:135px}
  .header-inner{
    width:min(100% - 28px,1200px);
    align-items:flex-start;
    flex-direction:column;
    gap:9px;
    padding:13px 0 11px;
  }
  .brand img{width:184px}
  .nav{width:100%;overflow:auto;gap:20px;padding-bottom:1px}
  .nav a{padding:2px 0 8px}
  .hero-inner,.author-inner,.section,.footer-inner{width:min(100% - 28px,1200px)}
  .hero-inner{padding-top:34px}
  .hero-copy h1{font-size:45px}
  .hero-copy p{font-size:17px}
  .hero-books{min-height:225px;width:112%;transform:scale(.87);transform-origin:left bottom}
  .author-inner{grid-template-columns:56px 1fr;gap:14px}
  .mail-icon{width:54px;height:54px;font-size:25px}
  .email-display{font-size:15px;overflow-wrap:anywhere}
  .section{padding:47px 0 50px}
  .section-head{display:block}
  .section-note{margin-top:11px}
  .section h2{font-size:33px}
  .book-grid{grid-template-columns:repeat(2,1fr);gap:29px 16px}
  .book-title{font-size:15px}
  .privacy-hero-inner,.privacy-content{width:min(100% - 28px,980px)}
  .privacy-hero h1{font-size:39px}
}

/* Version 4 logo substitution only — approved page design otherwise unchanged. */
.brand img{width:248px;height:auto}
.footer-logo img{width:218px;filter:none;opacity:1}
@media(max-width:900px){.brand img{width:214px}}
@media(max-width:650px){.brand img{width:196px}}