/* ---------- Base ---------- */
:root{
  --bg: #0b0f17;
  --card: #0f1624;
  --text: #e8eefc;
  --muted: #b6c2e2;
  --border: rgba(255,255,255,.10);
  --link: #7ab7ff;
  --link-hover: #a8d1ff;
  --accent: rgba(122,183,255,.18);
  --max: 920px;
}

*{ box-sizing: border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 600px at 20% -10%, rgba(122,183,255,.22), transparent 55%),
              radial-gradient(900px 500px at 90% 0%, rgba(122,183,255,.10), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ---------- Layout ---------- */
.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 18px 56px;
}

.site-header{
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(11,15,23,.65);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner{
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 18px;
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
}

.brand{
  display:flex;
  flex-direction: column;
  gap: 2px;
}
.brand a{
  color: var(--text);
  text-decoration:none;
  font-weight: 650;
  letter-spacing: .2px;
  font-size: 16px;
}
.brand small{
  color: var(--muted);
  font-size: 12px;
}

.nav{
  display:flex;
  gap: 14px;
  flex-wrap: wrap;
}
.nav a{
  color: var(--muted);
  text-decoration:none;
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}
.nav a:hover{
  color: var(--text);
  border-color: var(--border);
  background: rgba(255,255,255,.03);
}

/* ---------- Typography ---------- */
h1{
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.4px;
  margin: 26px 0 12px;
}
h2{
  font-size: 18px;
  color: var(--muted);
  font-weight: 600;
  margin: 22px 0 10px;
}
p{ margin: 0 0 14px; color: var(--text); }
a{ color: var(--link); }
a:hover{ color: var(--link-hover); }

/* ---------- Components ---------- */
.card{
  background: rgba(15,22,36,.72);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.hero{
  margin-top: 18px;
  padding: 22px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(122,183,255,.12), rgba(255,255,255,.02));
}

.badge{
  display:inline-block;
  font-size: 12px;
  color: var(--muted);
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.03);
  margin-bottom: 10px;
}

.doc-list{
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 12px;
}
.doc{
  background: rgba(15,22,36,.55);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 14px 12px;
}
.doc-title{
  font-weight: 650;
  margin: 0 0 6px;
}
.doc-meta{
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 10px;
}
.doc-actions a{
  display:inline-block;
  font-size: 14px;
  text-decoration:none;
  padding: 9px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.03);
}
.doc-actions a:hover{
  background: rgba(122,183,255,.10);
  border-color: rgba(122,183,255,.25);
}

.footer{
  margin-top: 30px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
hr{
  border: none;
  border-top: 1px solid var(--border);
  margin: 18px 0;
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 640px){
  h1{ font-size: 28px; }
  .header-inner{ align-items:flex-start; flex-direction: column; }
}

/* ---------- Book Hero ---------- */

.hero-grid{
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 28px;
  align-items: center;
}

.book-cover{
  width: 100%;
  max-width: 320px;
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0,0,0,.55);
  border: 1px solid var(--border);
}

@media (max-width: 800px){
  .hero-grid{
    grid-template-columns: 1fr;
  }
  .book-cover{
    max-width: 260px;
  }
}