/* Song — Radiance / Сияние, Book II
   Standalone stylesheet for /ru/books/radiance/song/.
   No dependency on assets/books.css.
*/

:root{
  --bg:#07080b;
  --fg:#f2f2f4;
  --muted:#a9a9b2;
  --song-blue: rgba(91, 139, 178, 0.18);
  --song-silver: rgba(205, 215, 224, 0.14);
  --song-violet: rgba(126, 103, 166, 0.12);
  --song-line: rgba(242,242,244,0.14);
  --song-glass: rgba(0,0,0,0.23);
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,"Noto Sans","Liberation Sans",sans-serif;
  background:var(--bg);
  color:var(--fg);
}

a{color:var(--fg);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{min-height:100vh}

.page{
  position:relative;
  min-height:100vh;
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

.page::before{
  content:"";
  position:absolute;
  inset:0;
  background:center/cover no-repeat;
  transform:scale(1.02);
  z-index:0;
  will-change:transform;
  animation:songDrift 86s ease-in-out infinite alternate;
}

@keyframes songDrift{
  0%{transform:scale(1.02) translate3d(0,0,0)}
  100%{transform:scale(1.04) translate3d(-0.35%,-0.25%,0)}
}

@media(prefers-reduced-motion:reduce){
  .page::before{animation:none}
}

.page::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
}

.page.book-song::before{
  background-image:url("backgrounds/song-bg.webp");
  background-position:58% center;
  filter:brightness(.54) contrast(1.06) saturate(.86) blur(1.1px);
}

.page.book-song::after{
  background:
    linear-gradient(90deg,
      rgba(7,8,11,0.96) 0%,
      rgba(7,8,11,0.82) 30%,
      rgba(7,8,11,0.52) 58%,
      rgba(7,8,11,0.24) 84%,
      rgba(7,8,11,0.08) 100%),
    radial-gradient(60% 70% at 70% 36%,
      var(--song-blue) 0%,
      rgba(91,139,178,0.03) 50%,
      rgba(91,139,178,0.00) 74%),
    radial-gradient(46% 58% at 24% 78%,
      var(--song-violet) 0%,
      rgba(126,103,166,0.00) 76%);
}

.site-header{
  position:relative;
  z-index:2;
  padding:22px 44px 0;
  text-align:right;
}

.site-header .brand{
  margin:0 0 6px;
  letter-spacing:.22em;
  text-transform:uppercase;
  font-size:14px;
  font-weight:600;
  opacity:.92;
}

.site-header .menu{
  font-size:13px;
  color:var(--muted);
}

.site-header .menu a{
  color:var(--muted);
  margin:0 10px;
}

.site-header .menu a:hover{
  color:var(--fg);
  text-decoration:none;
}

.main{
  position:relative;
  z-index:2;
  flex:1;
  display:flex;
  align-items:flex-start;
  justify-content:center;
}

.container{
  width:min(100%,1040px);
  max-width:1040px;
  margin:0 auto;
  padding:28px 44px 56px;
  text-shadow:0 2px 8px rgba(0,0,0,.84),0 0 22px rgba(0,0,0,.46);
}

.h1{
  margin:0 0 10px;
  font-size:28px;
  font-weight:800;
  letter-spacing:.02em;
}

.lead{
  margin:0 0 16px;
  max-width:82ch;
  color:var(--muted);
  line-height:1.35;
}

.list{
  margin-top:14px;
  border:1px solid rgba(242,242,244,.07);
  border-radius:18px;
  background:rgba(0,0,0,.18);
  backdrop-filter:blur(4px);
  overflow:hidden;
  box-shadow:0 12px 34px rgba(0,0,0,.18);
}

.list-header{
  padding:14px 16px;
  border-bottom:1px solid rgba(242,242,244,.055);
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
}

.list-header h2{
  margin:0;
  font-size:16px;
  font-weight:700;
  line-height:1.25;
}

.list-header .note{
  margin:0;
  font-size:12px;
  color:var(--muted);
  line-height:1.25;
}

button.btn{font-family:inherit;background:none}

.btn,
.song-readmore summary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 18px;
  border-radius:14px;
  border:1px solid rgba(242,242,244,.18);
  background:rgba(0,0,0,.22);
  backdrop-filter:blur(3px);
  font-size:14px;
  font-weight:800;
  text-decoration:none;
  cursor:pointer;
  user-select:none;
  transition:transform 140ms ease,background 140ms ease,border-color 140ms ease,opacity 140ms ease;
  opacity:.95;
  color:var(--fg)!important;
  appearance:none;
  -webkit-appearance:none;
  outline:none;
}

.btn:hover,
.song-readmore summary:hover{
  background:rgba(255,255,255,.08);
  border-color:rgba(242,242,244,.34);
  transform:translateY(-1px);
  opacity:1;
  text-decoration:none;
  color:var(--fg)!important;
}

.btn:active,
.song-readmore summary:active{transform:translateY(0) scale(.99)}

.btn:focus-visible,
.song-readmore summary:focus-visible{
  box-shadow:0 0 0 2px rgba(242,242,244,.18),0 0 0 6px rgba(242,242,244,.08);
}

.btn.secondary{
  font-weight:700;
  border-color:rgba(242,242,244,.14);
  background:rgba(0,0,0,.16);
  opacity:.95;
}

.seal{
  display:flex;
  align-items:center;
  gap:10px;
  margin-top:24px;
  color:var(--muted);
  font-size:12px;
  line-height:1.35;
}

.seal img{
  height:22px;
  width:auto;
  opacity:.75;
}

.song-kicker{
  margin:0 0 10px;
  color:var(--muted);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
}

.song-hero{
  display:grid;
  grid-template-columns:minmax(0,1fr) 260px;
  gap:24px;
  align-items:end;
  margin-top:16px;
}

.song-hero-copy{min-width:0}

.song-title-note{
  margin:8px 0 0;
  color:rgba(242,242,244,.86);
  font-family:Georgia,'Times New Roman',serif;
  font-size:20px;
  line-height:1.35;
  max-width:74ch;
}

.song-cover-panel{
  width:100%;
  max-width:260px;
  justify-self:end;
}

.song-cover-frame{
  display:block;
  aspect-ratio:2/3;
  border-radius:18px;
  overflow:hidden;
  border:1px solid rgba(242,242,244,.16);
  background:linear-gradient(145deg,rgba(91,139,178,.12),rgba(0,0,0,.30));
  box-shadow:0 22px 60px rgba(0,0,0,.44);
}

.song-cover-frame img,
.song-cover img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.song-cover-caption{
  margin:10px 0 0;
  color:var(--muted);
  font-size:12px;
  line-height:1.35;
  text-align:center;
}

.song-quote{
  margin:0;
  font-family:Georgia,'Times New Roman',serif;
  font-size:24px;
  line-height:1.35;
  color:var(--fg);
}

.song-copy{
  max-width:82ch;
  font-size:14px;
  line-height:1.35;
  color:var(--muted);
}

.song-copy p{margin:0 0 12px}
.song-copy p:last-child{margin-bottom:0}

.song-fragment-body{padding:18px}

.song-fragment-title{
  margin:0 0 14px;
  color:rgba(242,242,244,.72);
  font-size:13px;
  line-height:1.35;
}

.song-fragment-line{
  margin:0 0 18px;
  font-family:Georgia,'Times New Roman',serif;
  font-size:24px;
  line-height:1.35;
  color:var(--fg);
}

.song-readmore{margin:0}
.song-readmore summary{list-style:none}
.song-readmore summary::-webkit-details-marker{display:none}

.song-fragment-more{
  margin-top:16px;
  max-width:78ch;
  color:rgba(242,242,244,.78);
  font-size:14px;
  line-height:1.35;
}

.song-fragment-more p{margin:0 0 10px}

.song-fragment-note{
  margin:14px 0 0;
  color:rgba(169,169,178,.78);
  font-size:12px;
  line-height:1.35;
  max-width:72ch;
}

.song-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
  padding:18px;
}

.song-card{
  border:1px solid var(--song-line);
  border-radius:18px;
  padding:16px;
  background:var(--song-glass);
  backdrop-filter:blur(5px);
  box-shadow:0 12px 34px rgba(0,0,0,.20);
}

.song-card h3{
  margin:0 0 8px;
  font-size:17px;
  line-height:1.25;
}

.song-card p{
  margin:0;
  color:var(--muted);
  font-size:13px;
  line-height:1.35;
}

.song-section-body{padding:18px}

.song-status-grid{
  display:block;
  padding:10px 18px 12px;
}

.song-status{
  min-height:0;
  display:flex;
  align-items:baseline;
  gap:14px;
  border:0;
  border-top:1px solid rgba(242,242,244,.08);
  border-radius:0;
  padding:10px 0;
  background:transparent;
}

.song-status:first-child{border-top:none}

.song-status strong{
  display:block;
  flex:0 0 34px;
  margin:0;
  font-size:13px;
  line-height:1.35;
  letter-spacing:.06em;
  color:var(--fg);
}

.song-status span{
  display:block;
  color:var(--muted);
  font-size:13px;
  line-height:1.35;
}

.song-two-col{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  padding:18px;
}

.song-partner-box{
  border:1px solid rgba(91,139,178,.22);
  border-radius:18px;
  padding:16px;
  background:rgba(91,139,178,.045);
}

.song-partner-box h3{
  margin:0 0 8px;
  font-size:17px;
  line-height:1.25;
}

.song-partner-box p,
.song-partner-box li{
  color:var(--muted);
  font-size:13px;
  line-height:1.35;
}

.song-list{
  margin:0;
  padding-left:18px;
}

.song-list li{margin:0 0 8px}
.song-list li:last-child{margin-bottom:0}

.song-links-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:12px;
}

.song-audio-line{
  position:relative;
  height:1px;
  margin:18px 0;
  background:linear-gradient(90deg,rgba(242,242,244,0),rgba(205,215,224,.34),rgba(242,242,244,0));
}

.song-audio-line::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:7px;
  height:7px;
  border-radius:50%;
  transform:translate(-50%,-50%);
  background:rgba(205,215,224,.64);
  box-shadow:0 0 22px rgba(91,139,178,.36);
}

@media(max-width:900px){
  .site-header{padding:16px 22px 0}
  .main{align-items:flex-start;justify-content:center}
  .container{width:100%;padding:22px 22px 44px}
  .page.book-song::before{background-position:64% center}
  .song-hero,
  .song-grid,
  .song-two-col{grid-template-columns:1fr}
  .song-cover-panel{max-width:280px;justify-self:start}
  .song-cover{max-width:280px}
  .song-quote,
  .song-fragment-line{font-size:21px}
}