/* =============================================================
   CHAPTER UI  ·  reusable cinematic overlay components
   Shared across every BuildVerse chapter. Pair with chapter-ui.js.
   Provides: fullscreen overlay, comic reader, founder diary
   (page-turn book), and a simple "coming soon" modal.
   Uses the host chapter's brand tokens (--accent, --glass, …)
   with safe fallbacks.
   ============================================================= */
:root{
  --cu-accent:var(--accent,#e8520a);
  --cu-ink:var(--ink,#2F2B27);
  --cu-body:var(--body,#7d7367);
  --cu-paper:#fffdf6;
  --cu-paper2:#f4e9d2;
}

/* ---------------- fullscreen overlay shell ---------------- */
.cu-overlay{position:fixed; inset:0; z-index:100; display:grid; place-items:center;
  padding:clamp(14px,3vw,40px);
  opacity:0; visibility:hidden; transition:opacity .5s ease, visibility 0s linear .5s;}
.cu-overlay.open{opacity:1; visibility:visible; transition:opacity .5s ease;}
.cu-scrim{position:absolute; inset:0; background:rgba(18,11,4,.66);
  backdrop-filter:blur(9px) saturate(1.05); -webkit-backdrop-filter:blur(9px);}
.cu-stage{position:relative; z-index:1; width:100%; max-width:1080px; display:grid; place-items:center;
  transform:scale(.62); opacity:0; transform-origin:var(--ox,50%) var(--oy,50%);
  transition:transform .62s cubic-bezier(.2,.85,.2,1), opacity .5s ease;}
.cu-overlay.open .cu-stage{transform:scale(1); opacity:1;}

.cu-close{position:absolute; top:clamp(10px,2vw,20px); right:clamp(10px,2vw,22px); z-index:6;
  width:44px; height:44px; border-radius:50%; cursor:pointer; display:grid; place-items:center;
  font-size:18px; line-height:1; color:var(--cu-ink);
  background:var(--glass,linear-gradient(180deg,rgba(255,251,244,.82),rgba(255,247,237,.62)));
  border:1px solid var(--glass-brd,rgba(255,255,255,.6)); backdrop-filter:blur(12px);
  box-shadow:0 12px 26px -12px rgba(18,11,4,.6); transition:transform .3s, box-shadow .3s;}
.cu-close:hover{transform:rotate(90deg) scale(1.05); box-shadow:0 16px 30px -12px rgba(18,11,4,.7);}

.cu-title{position:absolute; top:clamp(12px,2.4vw,24px); left:0; right:0; z-index:4; text-align:center;
  font-family:'Cormorant Garamond',serif; font-weight:600; color:#f6e8d4;
  font-size:clamp(16px,2.4vw,24px); letter-spacing:.04em; text-shadow:0 2px 12px rgba(18,11,4,.7);
  pointer-events:none;}

/* generic nav arrows + hint (shared by comic & diary) */
.cu-arrow{position:absolute; top:50%; transform:translateY(-50%); z-index:5;
  width:52px; height:52px; border-radius:50%; cursor:pointer; display:grid; place-items:center;
  font-size:22px; color:var(--cu-ink);
  background:var(--glass,rgba(255,251,244,.8)); border:1px solid var(--glass-brd,rgba(255,255,255,.6));
  backdrop-filter:blur(12px); box-shadow:0 12px 26px -12px rgba(18,11,4,.6);
  transition:transform .3s, opacity .3s, box-shadow .3s;}
.cu-arrow:hover{box-shadow:0 16px 30px -12px rgba(18,11,4,.7);}
.cu-arrow.prev{left:clamp(6px,2vw,26px);} .cu-arrow.prev:hover{transform:translateY(-50%) translateX(-3px);}
.cu-arrow.next{right:clamp(6px,2vw,26px);} .cu-arrow.next:hover{transform:translateY(-50%) translateX(3px);}
.cu-arrow[disabled]{opacity:.25; pointer-events:none;}

.cu-counter{position:absolute; bottom:clamp(10px,2vw,22px); left:0; right:0; z-index:4; text-align:center;
  font-size:11px; letter-spacing:.24em; text-transform:uppercase; color:#e9d9c2; pointer-events:none;
  text-shadow:0 1px 8px rgba(18,11,4,.7);}

/* ---------------- COMIC reader ---------------- */
.cu-comic{position:relative; width:min(94vw,1080px); height:min(84vh,820px);
  display:grid; place-items:center;}
.cu-comic__frame{position:relative; width:100%; height:100%; display:grid; place-items:center;}
.cu-comic__page{position:absolute; max-width:100%; max-height:100%;
  border-radius:8px; box-shadow:0 40px 90px -34px rgba(0,0,0,.8), 0 0 0 1px rgba(255,255,255,.06);
  object-fit:contain; opacity:0; transform:translateX(var(--enter,40px)) scale(.98);
  transition:opacity .5s ease, transform .55s cubic-bezier(.2,.8,.2,1);}
.cu-comic__page.show{opacity:1; transform:none;}
.cu-comic__page.leaving{opacity:0; transform:translateX(var(--leave,-40px)) scale(.98);}

/* ---------------- FOUNDER DIARY (page-turn book) ---------------- */
.cu-book{position:relative; width:min(94vw,980px); height:min(82vh,660px);
  perspective:2400px;}
.cu-book__deck{position:absolute; inset:0; transform-style:preserve-3d;}
/* static backing so the open book always has two visible halves */
.cu-book__back{position:absolute; top:0; bottom:0; width:50%;
  background:linear-gradient(180deg,#efe4cd,#e4d5b6);
  box-shadow:inset 0 0 60px rgba(80,55,25,.25);}
.cu-book__back.left{left:0; border-radius:8px 0 0 8px; box-shadow:inset -14px 0 26px -18px rgba(60,40,20,.5);}
.cu-book__back.right{right:0; border-radius:0 8px 8px 0; box-shadow:inset 14px 0 26px -18px rgba(60,40,20,.5);}
/* leaves live on the right half, hinge on the central spine */
.cu-leaf{position:absolute; top:0; right:0; width:50%; height:100%;
  transform-style:preserve-3d; transform-origin:left center;
  transition:transform 1.05s cubic-bezier(.2,.72,.16,1);}
.cu-leaf.turned{transform:rotateY(-180deg);}
.cu-face{position:absolute; inset:0; backface-visibility:hidden; -webkit-backface-visibility:hidden;
  overflow:hidden; border-radius:0 8px 8px 0;
  background:
    repeating-linear-gradient(transparent 0 33px, rgba(120,90,50,.06) 33px 34px),
    linear-gradient(180deg,var(--cu-paper),var(--cu-paper2));
  box-shadow:inset 13px 0 30px -20px rgba(60,40,20,.5);}
.cu-face--back{transform:rotateY(180deg);}
/* spine seam accent */
.cu-book::after{content:""; position:absolute; top:0; bottom:0; left:50%; width:2px;
  transform:translateX(-1px); z-index:3; pointer-events:none;
  background:linear-gradient(180deg, rgba(60,40,20,.05), rgba(60,40,20,.4), rgba(60,40,20,.05));}
.cu-book__strap{position:absolute; top:0; bottom:0; left:50%; width:26px; transform:translateX(-13px);
  z-index:2; pointer-events:none;
  background:repeating-linear-gradient(180deg, transparent 0 20px, rgba(80,55,25,.28) 20px 24px);}

/* diary page content */
.diary{position:relative; height:100%; padding:clamp(26px,4vw,52px) clamp(26px,4.5vw,58px);
  display:flex; flex-direction:column; color:var(--cu-ink);}
.diary::before{content:""; position:absolute; top:26px; bottom:26px; left:clamp(20px,4vw,44px);
  width:1.5px; background:rgba(232,82,10,.28);}   /* margin line */
.diary__year{font-family:'Cormorant Garamond',serif; font-weight:700; font-size:clamp(30px,5vw,58px);
  color:var(--cu-accent); line-height:1; letter-spacing:.02em;}
.diary__title{font-family:'Cormorant Garamond',serif; font-weight:600; font-size:clamp(19px,2.5vw,27px);
  margin:2px 0 16px;}
.diary__illus{border:1.5px dashed rgba(120,90,50,.4); border-radius:10px; background:rgba(255,255,255,.35);
  aspect-ratio:16/7; display:grid; place-items:center; margin-bottom:18px;
  color:rgba(120,90,50,.7); font-size:11px; letter-spacing:.22em; text-transform:uppercase;}
.diary__illus b{font-style:normal; font-weight:600}
.diary__story{font-family:'Cormorant Garamond',serif; font-style:italic; font-size:clamp(14px,1.9vw,19px);
  line-height:1.55; color:#43382c;}
.diary__lesson{margin-top:auto; padding-top:16px; display:flex; align-items:flex-start; gap:10px;
  font-size:clamp(12px,1.5vw,14.5px); color:#5a4a38; line-height:1.4;}
.diary__lesson b{flex:none; font-size:9.5px; font-weight:600; letter-spacing:.18em; text-transform:uppercase;
  color:var(--cu-accent); background:rgba(232,82,10,.1); border:1px solid rgba(232,82,10,.2);
  padding:4px 9px; border-radius:20px; margin-top:1px;}
.diary__hw{font-family:'Caveat',cursive; font-size:clamp(15px,2vw,20px); color:#7a6448;}

/* diary title & closing pages */
.diary.cover{align-items:center; justify-content:center; text-align:center;}
.diary.cover::before{display:none;}
.diary.cover .k{font-size:10px; letter-spacing:.34em; text-transform:uppercase; color:var(--cu-accent); margin-bottom:16px;}
.diary.cover h2{font-family:'Cormorant Garamond',serif; font-weight:700; font-size:clamp(34px,6vw,64px);
  line-height:1; color:var(--cu-ink);}
.diary.cover .sub{margin-top:14px; font-family:'Cormorant Garamond',serif; font-style:italic;
  font-size:clamp(15px,2vw,20px); color:var(--cu-body);}
.diary.cover .seal{margin-top:26px; width:64px; height:64px; border-radius:50%; display:grid; place-items:center;
  font-size:26px; background:rgba(232,82,10,.1); border:1.5px solid rgba(232,82,10,.35);}

/* ---------------- COMING-SOON modal ---------------- */
.cu-modal{position:relative; width:min(90vw,440px); text-align:center;
  padding:clamp(34px,5vw,52px) clamp(28px,4vw,44px); border-radius:22px; color:var(--cu-ink);
  background:var(--glass,linear-gradient(180deg,rgba(255,251,244,.9),rgba(255,247,237,.75)));
  border:1px solid var(--glass-brd,rgba(255,255,255,.6)); backdrop-filter:blur(16px);
  box-shadow:0 40px 90px -34px rgba(18,11,4,.75);}
.cu-modal .ico{font-size:44px; margin-bottom:14px;}
.cu-modal h2{font-family:'Cormorant Garamond',serif; font-weight:600; font-size:clamp(24px,3.4vw,34px);
  line-height:1.1;}
.cu-modal p{margin-top:10px; color:var(--cu-body); font-size:14px;}
.cu-modal .badge{display:inline-block; margin-top:20px; font-size:10px; font-weight:600; letter-spacing:.2em;
  text-transform:uppercase; color:var(--cu-accent); background:rgba(232,82,10,.1);
  border:1px solid rgba(232,82,10,.22); padding:6px 14px; border-radius:20px;}

/* ---------------- INTERIOR (reusable room) ---------------- */
.cu-interior{position:relative; width:min(96vw,1180px); max-height:88vh; display:flex; flex-direction:column;
  overflow:hidden; border-radius:20px; color:var(--cu-ink);
  background:
    repeating-linear-gradient(93deg, rgba(0,0,0,.035) 0 1.5px, transparent 1.5px 7px),
    linear-gradient(180deg,#f6ead2 0%,#eed8ad 45%,#e0c58a 100%);
  border:1px solid rgba(90,55,20,.35);
  box-shadow:0 60px 120px -40px rgba(15,8,2,.9),
    inset 0 2px 0 rgba(255,232,190,.6), inset 0 -30px 60px -30px rgba(80,45,15,.45);}
.cu-interior__head{position:relative; padding:26px clamp(20px,3vw,36px) 18px; text-align:center;
  border-bottom:1px solid rgba(90,55,20,.28);
  background:linear-gradient(180deg, rgba(255,238,205,.65), rgba(240,215,165,.15));}
.cu-interior__head .k{font-size:10px; letter-spacing:.34em; text-transform:uppercase; color:var(--cu-accent);}
.cu-interior__head h2{font-family:'Cormorant Garamond',serif; font-weight:700;
  font-size:clamp(24px,3.4vw,38px); line-height:1.05; margin-top:6px; color:#2e2116;}
.cu-interior__head p{margin:6px auto 0; max-width:60ch; color:#6b5233; font-size:14px; line-height:1.5;}
.cu-interior__body{padding:24px clamp(18px,3vw,32px) 30px; overflow:auto;
  scrollbar-color:rgba(90,55,20,.35) transparent;}
.cu-section + .cu-section{margin-top:26px;}
.cu-section__hd{display:flex; align-items:baseline; gap:14px; margin-bottom:14px;
  border-bottom:1px dashed rgba(90,55,20,.32); padding-bottom:8px;}
.cu-section__hd h3{font-family:'Cormorant Garamond',serif; font-weight:600; font-size:clamp(16px,2vw,20px); color:#3a2a18;}
.cu-section__hd span{font-size:11px; letter-spacing:.18em; text-transform:uppercase; color:#8c6d3d;}
.cu-grid{display:grid; gap:14px;}
.cu-grid--1{grid-template-columns:1fr}
.cu-grid--2{grid-template-columns:repeat(2,1fr)}
.cu-grid--3{grid-template-columns:repeat(3,1fr)}
.cu-grid--4{grid-template-columns:repeat(4,1fr)}
@media (max-width:820px){.cu-grid--3,.cu-grid--4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.cu-grid--2,.cu-grid--3,.cu-grid--4{grid-template-columns:1fr}}

/* individual station card — warm handcrafted panel */
.cu-station{--tint:232,82,10;
  display:flex; flex-direction:column; overflow:hidden; border-radius:12px;
  background:linear-gradient(180deg,#fffaee,#f2e2bd);
  border:1px solid rgba(90,55,20,.22);
  box-shadow:0 14px 26px -14px rgba(60,38,12,.35), inset 0 1px 0 rgba(255,255,255,.55);
  transition:transform .35s cubic-bezier(.2,.8,.25,1), box-shadow .35s ease;}
.cu-station:hover{transform:translateY(-3px); box-shadow:0 22px 40px -16px rgba(60,38,12,.45), inset 0 1px 0 rgba(255,255,255,.6);}
.cu-station__body{padding:14px 15px 15px; display:flex; flex-direction:column; gap:6px;}
.cu-station__body h4{font-family:'Cormorant Garamond',serif; font-weight:600; font-size:19px; color:#2e2116; line-height:1.1;}
.cu-station__body p{color:#6b5233; font-size:13px; line-height:1.45;}
.cu-badge{align-self:flex-start; margin-top:6px; font-size:9.5px; font-weight:600; letter-spacing:.2em;
  text-transform:uppercase; padding:5px 10px; border-radius:20px;}
.cu-badge--soon{color:#a05018; background:rgba(232,82,10,.1); border:1px solid rgba(232,82,10,.24);}
.cu-badge--live{color:#1e6b3a; background:rgba(46,160,80,.12); border:1px solid rgba(46,160,80,.32);}

/* rectangular action button (Visit / Read) — inherits card tint */
.cu-cta{align-self:flex-start; margin-top:10px; cursor:pointer; font:inherit;
  padding:9px 16px; border-radius:6px; letter-spacing:.02em; font-size:12.5px; font-weight:600;
  color:#fff; background:linear-gradient(180deg, rgba(var(--tint),1), rgba(var(--tint),.82));
  border:1px solid rgba(0,0,0,.14);
  box-shadow:0 6px 12px -6px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.35);
  transition:transform .2s ease, box-shadow .2s ease, filter .2s ease;}
.cu-cta:hover{transform:translateY(-1px); filter:brightness(1.06);
  box-shadow:0 10px 18px -8px rgba(0,0,0,.45), inset 0 1px 0 rgba(255,255,255,.4);}
.cu-cta:active{transform:translateY(0)}

/* whole-card clickable variant — used when a card holds an href or pages */
.cu-station--clickable{cursor:pointer; background:linear-gradient(180deg,#fffaee,#f2e2bd); font:inherit;
  text-align:left; padding:0;}

/* CLAY WORKSTATION art — a tiny monitor + blueprint + desk items,
   tinted per Flow. Reusable by any station with .cu-workstation. */
.cu-workstation{position:relative; aspect-ratio:16/9;
  background:
    radial-gradient(120% 80% at 50% 100%, rgba(120,80,30,.28), transparent 68%),
    linear-gradient(180deg, rgba(var(--tint),.14) 0%, rgba(var(--tint),.06) 60%, transparent 100%),
    linear-gradient(180deg,#dcc79b,#bfa06a);
  overflow:hidden;}
.cu-workstation::before{content:""; position:absolute; left:8%; right:8%; bottom:12%; top:60%; border-radius:2px;
  background:repeating-linear-gradient(90deg, rgba(180,140,80,.35) 0 12px, rgba(140,100,50,.25) 12px 14px);
  box-shadow:inset 0 1px 0 rgba(255,235,195,.4);}
.cu-workstation .lamp{position:absolute; left:14%; top:14%; width:22%; aspect-ratio:1; border-radius:50%;
  background:radial-gradient(closest-side, rgba(255,215,140,.65), transparent 72%); mix-blend-mode:screen;
  animation:cu-breathe 6s ease-in-out infinite;}
@keyframes cu-breathe{0%,100%{opacity:.75}50%{opacity:1}}
.cu-workstation .monitor{position:absolute; right:14%; top:22%; width:42%; height:42%; border-radius:4px;
  background:linear-gradient(160deg,#2a2019,#181310); border:2px solid #6a4a24;
  box-shadow:0 6px 10px -6px rgba(0,0,0,.6), inset 0 0 0 1px rgba(255,255,255,.05);}
.cu-workstation .monitor::before{content:""; position:absolute; inset:5%; border-radius:2px;
  background:
    repeating-linear-gradient(rgba(255,255,255,.14) 0 1px, transparent 1px 3px),
    linear-gradient(160deg, rgba(var(--tint),.9), rgba(var(--tint),.6));}
.cu-workstation .monitor::after{content:""; position:absolute; left:50%; bottom:-8%; width:34%; height:6%;
  transform:translateX(-50%); background:#4d341a; border-radius:2px;}
.cu-workstation .blueprint{position:absolute; left:14%; top:34%; width:34%; height:26%; border-radius:2px;
  background:
    repeating-linear-gradient(0deg, rgba(255,255,255,.15) 0 6px, transparent 6px 12px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.15) 0 6px, transparent 6px 12px),
    linear-gradient(180deg,#2e5b8a,#1e4370);
  box-shadow:0 3px 5px -2px rgba(0,0,0,.4);}
.cu-workstation .items{position:absolute; right:16%; bottom:16%; width:20%; height:16%;
  background:radial-gradient(closest-side at 30% 60%, #c37a2c 0 6px, transparent 7px),
    radial-gradient(closest-side at 70% 50%, #7c5a34 0 5px, transparent 6px),
    radial-gradient(closest-side at 90% 70%, #5a4a2b 0 4px, transparent 5px);}

/* GIF card — clay TV frame for the Animation Studio */
.cu-station__tv{position:relative; aspect-ratio:4/3; padding:14px; overflow:hidden;
  background:#ffffff;
  border-bottom:1px solid rgba(90,55,20,.4);}
.cu-station__tv::before{content:""; position:absolute; inset:0; pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);}
.cu-station__tv img,
.cu-station__tv video{width:100%; height:100%; object-fit:contain; border-radius:4px; display:block;
  background:#ffffff;}

/* wide cover image (hero banner sitting above a section's cards) */
.cu-station__cover{position:relative; width:100%; overflow:hidden; background:#0d0906;
  border-bottom:1px solid rgba(90,55,20,.4);}
.cu-station__cover img{width:100%; height:auto; display:block;}
.cu-station:has(.cu-station__cover) .cu-station__body{display:none;}

/* mascot slot (Character Gallery placeholder tiles) */
.cu-station__mascot{aspect-ratio:1; display:grid; place-items:center;
  background:
    radial-gradient(120% 80% at 50% 100%, rgba(120,80,30,.35), transparent 65%),
    linear-gradient(180deg, rgb(var(--tint) / .18), rgba(var(--tint),.06));
  font-size:56px; line-height:1;}

@media (max-aspect-ratio:1/1){
  /* on portrait, show the diary one page at a time (hide the left backing pad) */
  .cu-book{height:min(78vh,620px);}
}

/* ---------- Mobile: tighten padding so content isn't drowning in whitespace ---------- */
@media (max-width:900px){
  .cu-overlay{ padding:8px; }
  .cu-title{ font-size:13px; top:6px; }
  .cu-counter{ font-size:9px; bottom:6px; letter-spacing:.18em; }

  .cu-interior{ width:min(98vw,1180px); max-height:92dvh; border-radius:14px; }
  .cu-interior__head{ padding:12px 16px 10px; }
  .cu-interior__head .k{ font-size:9px; letter-spacing:.24em; }
  .cu-interior__head h2{ font-size:20px; margin-top:2px; line-height:1.05; }
  .cu-interior__head p{ font-size:11.5px; margin-top:4px; line-height:1.4; }
  .cu-interior__body{ padding:12px 14px 16px; }
  .cu-section + .cu-section{ margin-top:14px; }
  .cu-section__hd{ margin-bottom:8px; padding-bottom:5px; gap:8px; }
  .cu-section__hd h3{ font-size:14px; }
  .cu-section__hd span{ font-size:9px; letter-spacing:.14em; }
  .cu-grid{ gap:8px; }
  /* keep 2 columns on landscape phone so cards fill available width */
  .cu-grid--3, .cu-grid--4{ grid-template-columns:repeat(2,1fr); }
  .cu-station__body{ padding:9px 10px 10px; gap:3px; }
  .cu-station__body h4{ font-size:14px; }
  .cu-station__body p{ font-size:11px; line-height:1.35; }
  .cu-badge{ font-size:8px; padding:3px 7px; margin-top:3px; }
  .cu-station__mascot{ font-size:34px; }

  .cu-close{ width:34px; height:34px; font-size:14px; top:8px; right:8px; }

  /* Comic + Book: leave a clear gutter on each side for the nav arrows
     so they don't overlap the page content. */
  .cu-comic{ width:88vw; height:86dvh; }
  .cu-book{ width:88vw; height:78dvh; }

  /* Smaller arrows tucked closer to the viewport edge (outside the book) */
  .cu-arrow{ width:38px; height:38px; font-size:17px; }
  .cu-arrow.prev{ left:4px; }
  .cu-arrow.next{ right:4px; }

  /* Diary: reduce padding + type so both pages fit fully inside each face */
  .diary{ padding:14px 16px 14px 22px; }
  .diary::before{ top:14px; bottom:14px; left:12px; }
  .diary__year{ font-size:22px; }
  .diary__title{ font-size:15px; margin:2px 0 8px; }
  .diary__illus{ aspect-ratio:16/6; margin-bottom:8px; font-size:9px; }
  .diary__story{ font-size:12.5px; line-height:1.5; }
  .diary__lesson{ padding-top:8px; font-size:10.5px; gap:6px; }
  .diary__lesson b{ font-size:8px; padding:3px 6px; }
  .diary.cover .k{ font-size:9px; margin-bottom:8px; }
  .diary.cover h2{ font-size:26px; }
  .diary.cover .sub{ font-size:13px; margin-top:8px; }
  .diary.cover .seal{ width:44px; height:44px; font-size:18px; margin-top:14px; }
}

@media (prefers-reduced-motion:reduce){
  .cu-stage{transition:opacity .3s ease!important; transform:none!important;}
  .cu-leaf{transition:transform .3s ease!important;}
  .cu-comic__page{transition:opacity .3s ease!important;}
}