@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Playfair+Display:ital,wght@0,500;0,600;0,700;1,500;1,600&display=swap');
:root{--bg:#071322;--ice:#b9d7ed;--muted:#9db0c4;--white:#f2f7fc;--line:rgba(211,232,248,.17);--glass:rgba(15,34,54,.66);--accent:#9dc9ec}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{min-height:100%;background:var(--bg)}
body{margin:0;min-height:100vh;color:var(--white);font-family:'DM Sans',sans-serif;background:radial-gradient(ellipse at 70% 18%,#18344d 0,transparent 36%),radial-gradient(ellipse at 12% 90%,#142a40 0,transparent 42%),linear-gradient(135deg,#071322,#0a1a2b 55%,#091523);overflow-x:hidden}
button,input{font:inherit}button{cursor:pointer}
.rain-layer{position:fixed;inset:0;pointer-events:none;opacity:.23;z-index:0;background-image:repeating-linear-gradient(103deg,transparent 0 23px,rgba(183,216,241,.13) 24px,transparent 25px 52px);background-size:140px 250px;animation:rain 1.4s linear infinite;mask-image:linear-gradient(to bottom,transparent,black 15%,black 88%,transparent)}
.ambient{position:fixed;border-radius:50%;filter:blur(70px);opacity:.17;pointer-events:none;z-index:0}.ambient-one{width:260px;height:260px;background:#4b83b3;top:9%;left:-90px}.ambient-two{width:330px;height:330px;background:#264d70;right:-130px;bottom:3%}
.app-shell{position:relative;z-index:1;min-height:100vh;max-width:1440px;margin:auto;padding:28px clamp(18px,5vw,76px) 18px;display:flex;flex-direction:column}
.topbar{display:flex;justify-content:space-between;align-items:center;padding-bottom:20px;border-bottom:1px solid rgba(211,232,248,.12)}
.wordmark{display:flex;align-items:center;gap:10px;color:#e6f2fc;text-decoration:none;font-size:11px;font-weight:700;letter-spacing:.19em}.wordmark i{font-family:'Playfair Display',serif;font-weight:500;letter-spacing:.05em;color:#a9cce6}.wordmark-mark{display:grid;place-items:center;width:29px;height:29px;border:1px solid var(--line);border-radius:50%;color:#b9d7ed;font-size:15px}
.top-meta{font-size:11px;color:#a9bfd2;letter-spacing:.07em;display:flex;align-items:center;gap:9px}.live-dot{width:6px;height:6px;border-radius:50%;background:#9dc9ec;box-shadow:0 0 12px #9dc9ec}
.screen{display:none;flex:1;animation:fadeIn .65s ease both}.screen.active{display:flex}
.entry-screen{align-items:center;justify-content:center;min-height:calc(100vh - 125px);position:relative;padding:40px 0 60px}
.glass{background:linear-gradient(135deg,rgba(25,48,70,.78),rgba(8,24,40,.66));border:1px solid rgba(211,232,248,.2);box-shadow:0 25px 90px rgba(0,0,0,.23),inset 0 1px 0 rgba(255,255,255,.06);backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px)}
.entry-content{width:min(640px,100%);padding:clamp(30px,6vw,64px);border-radius:24px;position:relative;overflow:hidden}
.entry-content:after{content:"";position:absolute;right:-65px;top:-95px;width:220px;height:220px;border:1px solid rgba(201,226,246,.11);border-radius:50%;box-shadow:0 0 0 28px rgba(201,226,246,.025),0 0 0 57px rgba(201,226,246,.02);pointer-events:none}
.eyebrow{font-size:10px;letter-spacing:.24em;color:#b2cce0;display:flex;align-items:center;gap:11px}.eyebrow-line{height:1px;width:27px;background:#a5c8e4}
h1{font:500 clamp(55px,9vw,91px)/.98 'Playfair Display',serif;letter-spacing:-.055em;margin:28px 0 24px;color:#f4f8fc}h1 em{color:#a9cde9;font-weight:500}
.entry-copy{font-size:14px;line-height:1.9;color:#bdcddd;margin:0 0 36px}
.entry-form{display:flex;flex-direction:column;gap:12px;max-width:390px}.entry-form label{font-size:11px;color:#d4e1ec;letter-spacing:.03em}.input-wrap{display:flex;align-items:center;border:1px solid rgba(205,227,245,.22);background:rgba(3,14,26,.28);border-radius:10px;padding:0 15px;transition:border-color .2s}.input-wrap:focus-within{border-color:#a6cbe7}.input-wrap input{width:100%;min-width:0;background:transparent;border:0;outline:0;color:#f5f9fd;padding:15px 0;font-size:13px}.input-wrap input::placeholder{color:#7f96aa}.input-wrap span{color:#9fc5e3}
.primary-btn{border:1px solid rgba(226,241,252,.8);background:#d9eaf6;color:#0b2032;padding:14px 17px;border-radius:10px;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:20px;transition:transform .2s,background .2s;box-shadow:0 5px 24px rgba(130,181,218,.08)}.primary-btn:hover{transform:translateY(-2px);background:#f0f7fc}.entry-foot{display:flex;justify-content:space-between;gap:12px;margin-top:46px;padding-top:17px;border-top:1px solid rgba(211,232,248,.13);font-size:9px;letter-spacing:.14em;color:#8da6bb}.entry-foot span:last-child{letter-spacing:.03em;font-style:italic}
.entry-side-note{position:absolute;right:0;bottom:20%;display:flex;align-items:center;gap:13px;font-size:10px;line-height:1.8;letter-spacing:.06em;color:#93abc0;text-transform:lowercase}.vertical-rule{width:1px;height:38px;background:rgba(174,210,236,.45)}
.story-screen{flex-direction:column;justify-content:center;padding:clamp(25px,4vw,52px) 0 22px;min-height:calc(100vh - 135px)}
.story-layout{display:grid;grid-template-columns:180px minmax(0,1fr);gap:clamp(22px,4vw,60px);width:100%;max-width:1100px;margin:auto;align-items:stretch}
.chapter-rail{display:flex;flex-direction:column;min-width:0;padding:12px 0 8px}.rail-caption{font-size:9px;letter-spacing:.2em;color:#7894ad;margin-bottom:23px}.rail-list{display:flex;flex-direction:column;gap:4px}.rail-item{display:flex;align-items:center;gap:12px;color:#7890a5;padding:10px 8px;border-radius:8px;font-size:11px;line-height:1.35;transition:color .2s,background .2s}.rail-item .rail-num{font-size:9px;color:#5e7891;font-variant-numeric:tabular-nums;flex:0 0 auto}.rail-item.active{color:#eef7ff;background:rgba(189,220,243,.09)}.rail-item.active .rail-num{color:#b7d8f0}.rail-bottom{margin-top:auto;padding-top:25px;border-top:1px solid var(--line);font-size:9px;letter-spacing:.13em;line-height:2;color:#7894ad}.rail-bottom strong{font-size:11px;color:#d2e5f4;letter-spacing:.2em}
.chapter-card{border-radius:22px;padding:clamp(24px,5vw,54px);min-height:540px;display:flex;flex-direction:column;overflow:hidden;position:relative;min-width:0}.chapter-card:before{content:"";position:absolute;width:300px;height:300px;border-radius:50%;border:1px solid rgba(190,222,245,.07);right:-170px;top:-175px;box-shadow:0 0 0 34px rgba(190,222,245,.025),0 0 0 70px rgba(190,222,245,.018);pointer-events:none}
.chapter-top{display:flex;align-items:center;gap:12px;font-size:9px;letter-spacing:.17em;color:#8ca8c0}.chapter-dash{width:25px;height:1px;background:#7299b9}.chapter-content{flex:1;position:relative;z-index:1;padding:38px 0 44px;animation:contentIn .4s ease both}.chapter-content .kicker{font-size:10px;color:#a4c9e6;letter-spacing:.16em;text-transform:uppercase;margin-bottom:17px}.chapter-content h2{font:500 clamp(34px,5vw,57px)/1.12 'Playfair Display',serif;letter-spacing:-.035em;margin:0 0 24px;max-width:700px;text-shadow:0 0 16px rgba(151,205,241,.13),0 0 34px rgba(116,174,218,.08)}.chapter-content h2 em{color:#a9cde9;font-weight:500}.chapter-content p{font-size:14px;line-height:1.95;color:#c0d0df;max-width:650px;margin:0 0 16px}.chapter-content .small-note{font-size:11px;color:#8ca7bd;margin-top:24px;font-style:italic}.chapter-content .pull-quote{font:italic 22px/1.55 'Playfair Display',serif;color:#e1eef8;border-left:1px solid #9fc6e5;padding:3px 0 3px 20px;margin:25px 0;max-width:580px}
.chapter-footer{border-top:1px solid var(--line);padding-top:19px;display:flex;justify-content:space-between;align-items:center;gap:18px;position:relative;z-index:1}.progress-wrap{display:flex;align-items:center;gap:12px;color:#809bb3;font-size:9px;letter-spacing:.08em;min-width:120px}.progress-track{width:70px;height:2px;background:rgba(202,225,243,.14)}.progress-track div{height:100%;background:#b6d9f2;width:10%;transition:width .3s}.nav-buttons{display:flex;gap:10px;align-items:center}.quiet-btn{border:1px solid transparent;background:transparent;color:#a6bed1;padding:12px 10px;font-size:11px;border-radius:8px}.quiet-btn:hover{color:#f1f8fe}.quiet-btn:disabled{opacity:.25;cursor:default}.next-btn{padding:12px 17px;min-width:112px}.story-greeting{text-align:right;font-size:10px;color:#7e9bb4;letter-spacing:.04em;max-width:1100px;width:100%;margin:15px auto 0}
.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:650px;margin-top:26px}.feature-chip{border:1px solid rgba(204,227,245,.14);background:rgba(200,227,247,.035);padding:15px;border-radius:12px}.feature-chip b{display:block;font-size:11px;color:#e1edf7;margin-bottom:6px}.feature-chip span{font-size:11px;line-height:1.6;color:#93adc2}
.chat-scene{max-width:560px;display:flex;flex-direction:column;gap:11px;margin:22px 0 12px}.chat-bubble{padding:14px 17px;border:1px solid rgba(207,229,246,.15);border-radius:15px 15px 15px 4px;background:rgba(209,232,249,.055);color:#d8e6f2;font-size:12px;line-height:1.7;max-width:88%;align-self:flex-start}.chat-bubble.farid{align-self:flex-end;border-radius:15px 15px 4px 15px;background:rgba(124,176,215,.13);border-color:rgba(156,203,236,.2)}.chat-bubble small{display:block;color:#86a5bf;font-size:9px;letter-spacing:.08em;margin-bottom:5px}
.story-image{display:block;width:100%;max-width:580px;aspect-ratio:16/9;object-fit:cover;border-radius:14px;border:1px solid rgba(205,230,247,.22);margin:22px 0 12px;box-shadow:0 15px 45px rgba(0,0,0,.2)}
.final-illustration{margin:20px 0 22px;width:190px;height:190px;border-radius:50%;border:1px solid rgba(205,230,247,.22);background:radial-gradient(circle at 50% 36%,rgba(179,216,242,.24),rgba(111,154,188,.08) 65%,rgba(3,17,30,.3));display:grid;place-items:center;overflow:hidden;box-shadow:0 0 0 12px rgba(199,226,246,.025)}.final-illustration svg{width:180px;height:180px}.signature{margin-top:27px;color:#9bb9d1;font-size:11px;line-height:1.9}.signature strong{display:block;color:#e3eef7;font-size:12px;font-weight:600}
.gif-slot{position:relative;display:grid;place-items:center;flex:0 0 auto;width:100%;max-width:180px;min-height:110px;margin-top:22px;padding:9px;overflow:hidden;border-radius:15px;box-shadow:0 14px 35px rgba(0,0,0,.2),inset 0 1px 0 rgba(255,255,255,.07)}
.gif-slot img{display:block;width:100%;max-width:100%;max-height:100px;height:auto;object-fit:contain;object-position:center;background:transparent;border:0}
.gif-placeholder{width:100%;min-height:88px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;border:1px dashed rgba(179,215,240,.24);border-radius:9px;color:#8daac2;font-size:9px;letter-spacing:.17em;text-align:center}.gif-placeholder-icon{font-size:19px;color:#b9d7ed;text-shadow:0 0 16px rgba(157,201,236,.24)}.gif-placeholder small{font-size:9px;letter-spacing:.03em;color:#6f8ba4}
.music-widget{position:fixed;right:clamp(14px,3vw,36px);bottom:clamp(56px,6vh,70px);z-index:5;width:min(310px,calc(100vw - 28px));display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:15px;box-shadow:0 15px 45px rgba(0,0,0,.24),inset 0 1px 0 rgba(255,255,255,.07)}.music-toggle{flex:0 0 34px;width:34px;height:34px;border:1px solid rgba(206,230,247,.24);border-radius:50%;background:rgba(200,226,245,.1);color:#d9edf9;font-size:12px;display:grid;place-items:center}.music-toggle:hover{background:rgba(200,226,245,.2)}.music-meta{min-width:0;flex:1;display:flex;flex-direction:column;gap:4px}.music-kicker{color:#7e9bb4;font-size:7px;letter-spacing:.13em;white-space:nowrap}.music-title{color:#d8e8f5;font-size:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.music-volume{width:50px;accent-color:#a9cde9}
.visit-count{letter-spacing:.03em}.site-footer{display:flex;justify-content:space-between;gap:15px;border-top:1px solid rgba(211,232,248,.1);padding-top:15px;margin-top:auto;color:#6f879d;font-size:9px;letter-spacing:.1em}.site-footer span:last-child{letter-spacing:.02em}
@keyframes rain{from{background-position:0 0}to{background-position:-25px 250px}}@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes contentIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:800px){.app-shell{padding:18px 17px 14px}.entry-side-note{display:none}.entry-screen{min-height:calc(100vh - 110px);padding:28px 0 45px}.entry-content{padding:31px 25px;border-radius:20px}.entry-foot{margin-top:35px}.story-screen{padding:22px 0;min-height:calc(100vh - 110px)}.story-layout{grid-template-columns:1fr;gap:15px}.chapter-rail{padding:0;display:block}.rail-caption,.rail-bottom{display:none}.rail-list{flex-direction:row;overflow-x:auto;padding:2px 0 8px;gap:6px;scrollbar-width:none}.rail-list::-webkit-scrollbar{display:none}.rail-item{flex:0 0 auto;padding:9px 11px;border:1px solid transparent;white-space:nowrap}.rail-item.active{border-color:rgba(198,225,245,.14)}.rail-item .rail-num{display:none}.chapter-card{min-height:calc(100vh - 225px);padding:25px 21px 20px;border-radius:18px}.chapter-content{padding:31px 0 32px}.chapter-content h2{font-size:clamp(34px,8vw,47px)}.chapter-content p{font-size:13px}.chapter-footer{align-items:flex-end}.progress-wrap{min-width:auto;gap:8px}.progress-track{width:38px}.quiet-btn{padding:10px 5px}.quiet-btn span{display:none}.next-btn{min-width:98px}.story-greeting{font-size:9px}.site-footer{font-size:8px}.site-footer span:last-child{text-align:right}.feature-grid{grid-template-columns:1fr}.chat-bubble{max-width:95%}.music-widget{bottom:54px;right:12px;width:min(285px,calc(100vw - 24px));padding:8px 10px}.music-volume{width:40px}}
@media(max-width:390px){.top-meta{font-size:9px}.wordmark{font-size:9px}.entry-content{padding:27px 20px}h1{font-size:58px}.entry-copy{font-size:13px}.chapter-card{padding:22px 17px 17px}.chapter-top{font-size:8px;gap:8px}.chapter-content h2{font-size:32px}.chapter-content p{font-size:12px}.nav-buttons{gap:3px}.next-btn{min-width:88px;padding:11px}.progress-wrap{font-size:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}.rain-layer{display:none}}

/* === BEHIND THE RAIN: LIVING BACKGROUND === */

/* Hujan disimpan, tetapi sementara disembunyikan */
.rain-layer {
  display: none;
  opacity: 0.38;
  background-image:
    repeating-linear-gradient(
      103deg,
      transparent 0 22px,
      rgba(183, 216, 241, 0.32) 23px,
      transparent 24px 48px
    );
  background-size: 140px 250px;
  animation: rain 1.15s linear infinite;
}

}

/* Gradient biru bergerak perlahan */
body {
  background-size: 160% 160%;
  animation: blueGradientDrift 22s ease-in-out infinite alternate;
}

@keyframes blueGradientDrift {
  0% {
    background-position: 0% 0%;
  }
  50% {
    background-position: 50% 30%;
  }
  100% {
    background-position: 100% 80%;
  }
}

/* Cahaya biru ikut bergeser */
.ambient-one {
  animation: blueGlowOne 16s ease-in-out infinite alternate;
}

.ambient-two {
  animation: blueGlowTwo 20s ease-in-out infinite alternate;
}

@keyframes blueGlowOne {
  from {
    transform: translate(0, 0);
  }
  to {
    transform: translate(65px, 45px);
  }
}

@keyframes blueGlowTwo {
  from {
    transform: translate(0, 0);
  }
  to {
    transform: translate(-55px, -35px);
  }
}

/* Hormati pengaturan pengurangan animasi */
@media (prefers-reduced-motion: reduce) {
  body,
  .ambient-one,
  .ambient-two {
    animation: none;
  }
}

/* Soft blurred decorative shapes */
.entry-content::after,
.chapter-card::before,
.chapter-card::after {
  filter: blur(18px);
  opacity: 0.45;
}

/* Make large circular outlines less defined */
.entry-content::after {
  border-color: rgba(201, 226, 246, 0.05);
  box-shadow:
    0 0 0 28px rgba(201, 226, 246, 0.018),
    0 0 0 57px rgba(201, 226, 246, 0.012);
}

/* Keep the glass panels and text crisp */
.glass,
.chapter-card {
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

/* === GLOWING STARFALL === */

/* Brighter falling stars */
.starfall {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 1;
  background-image:
    radial-gradient(circle, #fff 0 1.5px, rgba(220,242,255,.8) 2px, transparent 5px),
    radial-gradient(circle, #fff 0 1px, rgba(220,242,255,.7) 2px, transparent 4px),
    radial-gradient(circle, #fff 0 1.2px, rgba(220,242,255,.6) 2px, transparent 4px);
  background-size: 113px 173px, 167px 223px, 241px 197px;
  background-position: 20px 0, 70px 50px, 130px 20px;
  animation: starsFall 35s linear infinite;
  filter: drop-shadow(0 0 5px rgba(220,242,255,.9));
}

.starfall::after {
  content: "";
  position: absolute;
  inset: -100px 0 0;
  background-image:
    radial-gradient(circle, #fff 0 2px, rgba(220,242,255,.7) 3px, transparent 8px),
    radial-gradient(circle, #fff 0 1.5px, rgba(220,242,255,.6) 3px, transparent 7px);
  background-size: 307px 330px, 397px 420px;
  background-position: 50px 0, 200px 100px;
  animation: starsFall 45s linear infinite, starsTwinkle 4s ease-in-out infinite alternate;
}

@keyframes starsFall {
  from { background-position: 20px -200px, 70px -250px, 130px -180px; }
  to { background-position: 50px 800px, 100px 1000px, 90px 900px; }
}

@keyframes starsTwinkle {
  from { opacity: .45; }
  to { opacity: 1; }
}


/* Starfall: slower, softer, seamless-looking fade */
.starfall {
  animation-duration: 35s, 35s;
  animation-timing-function: linear, ease-in-out;
  animation-iteration-count: infinite, infinite;
  opacity: 0;
  animation-name: starsFall, starsFade;
}

.starfall::after {
  animation-duration: 45s, 4s;
  animation-timing-function: linear, ease-in-out;
  animation-iteration-count: infinite, infinite;
}

@keyframes starsFade {
  0% {
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  78% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.chapter-card {
  background: rgba(15, 35, 53, 0.48);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Glass blur untuk opening dan card cerita */

/* Strong frosted glass: opening + chapter */
.chapter-card.glass,
#landing .glass {
  background: linear-gradient(
    135deg,
    rgba(25, 48, 70, 0.30),
    rgba(8, 24, 40, 0.24)
  );

  backdrop-filter: blur(32px) saturate(125%);
  -webkit-backdrop-filter: blur(32px) saturate(125%);
}

/* Animasi setiap kali chapter berganti */
.chapter-content.reflow {
  animation: contentIn 650ms ease-out both;
}

@keyframes contentIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Chapter illustrations: compact landscape presentation */
.chapter-asset{display:block;width:100%;max-width:420px;height:auto;aspect-ratio:16/9;object-fit:cover;object-position:center;border-radius:12px;border:1px solid rgba(205,230,247,.22);margin:16px 0 18px;box-shadow:0 12px 32px rgba(0,0,0,.18)}
@media(max-width:800px){.chapter-asset{max-width:100%;aspect-ratio:16/9;margin:14px 0 16px}}


/* GIF dekoratif tanpa card/background */
.gif-slot{
  background:transparent!important;
  border:0!important;
  box-shadow:none!important;
  backdrop-filter:none!important;
  -webkit-backdrop-filter:none!important;
  border-radius:0!important;
  padding:0!important;
  min-height:0!important;
  overflow:visible!important;
}
.gif-slot img{
  width:100%;
  max-width:180px;
  max-height:110px;
  object-fit:contain;
  filter:drop-shadow(0 5px 12px rgba(0,0,0,.16));
}
.gif-placeholder{
  min-height:0;
  border:0;
  border-radius:0;
  background:transparent;
}

/* BTR signature intro — the same traveling silver/ice-blue sweep on "the Rain." */
.entry-content h1 em{position:relative;display:inline-block;color:#a9cde9;font-weight:500;text-shadow:none}
.entry-content h1 em::after{content:"the Rain.";position:absolute;inset:0;pointer-events:none;color:transparent;background:linear-gradient(108deg,transparent 0%,transparent 31%,#a8ddff00 38%,#a8ddff 44%,#f8fdff 49%,#fff 52%,#9edcff 57%,#7fcaff00 65%,transparent 72%);background-size:260% 100%;background-position:145% center;background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;opacity:0;filter:drop-shadow(0 0 9px #a6e2ff) drop-shadow(0 0 20px #69bdff) drop-shadow(0 0 34px #4daaff85);animation:btrSignatureSweep 2.8s .62s cubic-bezier(.2,.7,.22,1) 1 both}
@keyframes btrSignatureSweep{0%{opacity:0;background-position:145% center;filter:drop-shadow(0 0 0 #a6e2ff)}14%{opacity:.25}28%{opacity:1;filter:drop-shadow(0 0 12px #a6e2ff) drop-shadow(0 0 25px #69bdff)}48%{opacity:.9;background-position:35% center;filter:drop-shadow(0 0 16px #e4f8ff) drop-shadow(0 0 36px #69bdff) drop-shadow(0 0 50px #4daaff85)}70%{opacity:.35;background-position:-25% center}88%,100%{opacity:0;background-position:-45% center;filter:drop-shadow(0 0 0 #a6e2ff)}}
@media(prefers-reduced-motion:reduce){.entry-content h1 em::after{animation:none;opacity:0}}

/* Main BTR — shared signature intro, without a chapter label */
.signature-intro{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:clamp(22px,6vw,80px);background:#03070d;overflow:hidden;animation:signatureIntroExit .9s 3.35s ease forwards}
.signature-intro:before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 50% 48%,#16406438,transparent 55%),linear-gradient(180deg,#02050a22,#02050a88)}
.signature-intro .signature{width:min(920px,100%);padding-left:clamp(0px,3vw,40px)}
.signature{position:relative;isolation:isolate;width:min(920px,100%);padding-left:clamp(0px,3vw,40px)}.signature::before{content:"";position:absolute;z-index:-1;pointer-events:none;left:clamp(0px,1vw,12px);top:clamp(82px,11vw,125px);width:min(700px,88vw);height:clamp(120px,20vw,235px);opacity:0;background:repeating-conic-gradient(from -10deg at 48% 52%,transparent 0deg 7deg,#bfeaff35 7.2deg 7.7deg,transparent 8deg 15deg);-webkit-mask-image:radial-gradient(ellipse at center,#000 0%,#000 20%,transparent 72%);mask-image:radial-gradient(ellipse at center,#000 0%,#000 20%,transparent 72%);filter:blur(4px);transform:scale(.78) rotate(-7deg);animation:introRayFlash 3.2s .45s cubic-bezier(.16,.7,.25,1) both}.signature h1{position:relative}.word-rain{position:relative;isolation:isolate}.word-rain::after{content:"";position:absolute;inset:-12% -7%;z-index:-1;pointer-events:none;background:repeating-conic-gradient(from -10deg at 48% 52%,transparent 0deg 8deg,#bfeaff45 8.2deg 8.8deg,transparent 9deg 17deg);-webkit-mask-image:radial-gradient(ellipse at center,#000 0%,#000 22%,transparent 70%);mask-image:radial-gradient(ellipse at center,#000 0%,#000 22%,transparent 70%);filter:blur(3px);opacity:0;transform:scale(.75);animation:rainWordRayFlash 3.2s .45s cubic-bezier(.16,.7,.25,1) both}.signature h1::after{content:"";position:absolute;z-index:-1;left:28%;top:34%;width:68%;height:60%;pointer-events:none;background:radial-gradient(ellipse at center,#8fd5ff42,transparent 68%);filter:blur(25px);opacity:0;animation:titleGlowFlash 3s .5s ease-out both}.signature-kicker{display:flex;align-items:center;gap:12px;color:#9fb7ca;font-size:9px;letter-spacing:.24em;font-weight:700;margin-bottom:27px;animation:fadeUp .7s .15s both}.signature-kicker i{width:27px;height:1px;background:#a9cde8;display:inline-block}.signature h1{margin:0;display:flex;flex-direction:column;align-items:flex-start;line-height:.86;font-weight:500}.word-behind{font:600 clamp(68px,11vw,132px)/.9 "Playfair Display",Georgia,serif;letter-spacing:-.065em;color:#f0f3f8;animation:wordReveal .95s .2s both}.word-rain{font:italic 600 clamp(58px,10.5vw,122px)/.95 "Playfair Display",Georgia,serif;letter-spacing:-.065em;background:linear-gradient(105deg,#f4fbff 0%,#8bd5ff 19%,#d5f0ff 34%,#5aa9df 48%,#f5fcff 59%,#9bd9ff 76%,#eaf7ff 90%,#6db7e9 100%);background-size:300% auto;background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 13px #78caff2e);animation:wordReveal .9s .52s both,gradientFlow 4.6s 1.3s ease-in-out infinite}.signature-tagline{color:#a9b9c9;font-size:clamp(12px,1.35vw,15px);margin:22px 0 0;animation:fadeUp .65s 1.05s both}.eyebrow{font-size:9px;letter-spacing:.23em;color:#9ecff2;font-weight:700}
.signature-intro .word-rain{filter:drop-shadow(0 0 7px #83cfff99) drop-shadow(0 0 24px #65bfff70);animation:wordReveal .9s .52s both,gradientFlow 4.6s 1.3s ease-in-out infinite}
.signature-intro .word-rain::before{content:"the Rain.";position:absolute;inset:0;z-index:2;pointer-events:none;font:inherit;letter-spacing:inherit;line-height:inherit;white-space:nowrap;background:linear-gradient(108deg,transparent 0%,transparent 31%,#a8ddff00 38%,#a8ddff 44%,#f8fdff 49%,#fff 52%,#9edcff 57%,#7fcaff00 65%,transparent 72%);background-size:260% 100%;background-position:145% center;background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent;mix-blend-mode:screen;opacity:0;filter:drop-shadow(0 0 9px #a6e2ff) drop-shadow(0 0 20px #69bdff) drop-shadow(0 0 34px #4daaff85);animation:signatureSweep 2.8s .62s cubic-bezier(.2,.7,.22,1) 1 both}
@keyframes signatureSweep{0%{opacity:0;background-position:145% center;filter:drop-shadow(0 0 0 #a6e2ff)}14%{opacity:.25}28%{opacity:1;filter:drop-shadow(0 0 12px #a6e2ff) drop-shadow(0 0 25px #69bdff)}48%{opacity:.9;background-position:35% center;filter:drop-shadow(0 0 16px #e4f8ff) drop-shadow(0 0 36px #69bdff) drop-shadow(0 0 50px #4daaff85)}70%{opacity:.35;background-position:-25% center}88%,100%{opacity:0;background-position:-45% center;filter:drop-shadow(0 0 0 #a6e2ff)}}
@keyframes signatureIntroExit{to{opacity:0;visibility:hidden;pointer-events:none}}
@media(max-width:760px){.signature-intro{padding:24px}.signature-intro .signature{padding-left:0}.signature-intro .word-behind{font-size:clamp(58px,15vw,92px)}.signature-intro .word-rain{font-size:clamp(50px,14vw,84px)}}
@media(prefers-reduced-motion:reduce){.signature-intro{animation:signatureIntroExit .01ms 1.2s forwards}.signature-intro .signature::before,.signature-intro .word-rain::before,.signature-intro .word-rain::after,.signature-intro .signature h1::after{animation:none;opacity:0}}

/* Signature intro animation keyframes shared with AU Chapter 1 */

@keyframes wordReveal{from{opacity:0;transform:translateY(17px);filter:blur(10px)}to{opacity:1;transform:none;filter:blur(0)}}

@keyframes gradientFlow{0%,100%{background-position:0% center}50%{background-position:100% center}}

@keyframes introRayFlash{0%{opacity:0;transform:scale(.7) rotate(-9deg)}12%{opacity:.82}28%{opacity:.62;transform:scale(.95) rotate(-2deg)}55%{opacity:.3;transform:scale(1.08) rotate(1deg)}78%{opacity:.12}100%{opacity:0;transform:scale(1.18) rotate(3deg)}}

@keyframes rainWordRayFlash{0%{opacity:0;transform:scale(.68)}12%{opacity:1;transform:scale(.88)}28%{opacity:.7;transform:scale(1)}52%{opacity:.35;transform:scale(1.08)}78%{opacity:.12}100%{opacity:0;transform:scale(1.15)}}

@keyframes titleGlowFlash{0%{opacity:0;transform:scale(.72)}18%{opacity:.85}38%{opacity:.55;transform:scale(1)}68%{opacity:.2}100%{opacity:0;transform:scale(1.12)}}

@keyframes fadeUp{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}