/* ===== Brand tokens (จาก Tong Lampang Luang Color) ===== */
:root {
  --ink:#273937;       /* primary dark */
  --sage:#8ca88a;
  --brown:#9b7150;
  --peach:#f0c0a6;
  --mist:#d6e2d4;
  --paper:#f6f0e4;     
  --paper-2:#fbf7ee;
  --line:rgba(39,57,55,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:'Prompt',sans-serif;overflow-x:hidden;
}

/* เกรนกระดาษทั้งหน้า */
body::before{
  content:"";position:fixed;inset:0;z-index:1;pointer-events:none;
  opacity:0.15;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .55  0 0 0 0 .45  0 0 0 0 .33  0 0 0 .22 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  transform: translateZ(0); 
  will-change: transform;
}

.display{font-family:'Chonburi','Prompt',serif;font-weight:400}
.print{font-family:'Noto Serif Thai','Prompt',serif}
.hide-scrollbar::-webkit-scrollbar{display:none}.hide-scrollbar{scrollbar-width:none}
.pre-line{white-space:pre-line;word-break:break-word}

/* ===== Hero ===== */
.hero{background:var(--ink);color:var(--paper);position:relative;overflow:hidden}
.hero::after{ 
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:22px;background:var(--paper);
  -webkit-mask:radial-gradient(circle 11px at 11px 22px,#0000 98%,#000) 0 0/22px 22px repeat-x;
          mask:radial-gradient(circle 11px at 11px 22px,#0000 98%,#000) 0 0/22px 22px repeat-x;
}
.hero-bloom{position:absolute;color:var(--sage);opacity:.14;pointer-events:none}
.chip-tag{
  display:inline-flex;align-items:center;gap:.5rem;font-size:.7rem;letter-spacing:.14em;
  padding:.35rem .9rem;border-radius:999px;border:1px solid rgba(240,192,166,.45);color:var(--peach);
}

/* ===== Marquee ===== */
.marquee{background:var(--peach);color:var(--ink);overflow:hidden;white-space:nowrap;border-bottom:1px solid var(--line)}
.marquee-track{display:inline-flex;gap:2rem;padding:.55rem 0;animation:slide 38s linear infinite}
.marquee-track span{font-size:.8rem;font-weight:500;display:inline-flex;align-items:center;gap:2rem}
.marquee-track span::after{content:"✦";color:var(--brown)}
@keyframes slide{to{transform:translateX(-50%)}}

/* ===== Book object ===== */
.wrap{width:100%;max-width:1760px;margin:0 auto;padding-inline:clamp(1.25rem,3.5vw,3.5rem)}
.shelf{display:grid;grid-template-columns:repeat(2,1fr);gap:2.25rem 1rem}
@media(min-width:640px){.shelf{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:3.25rem 1.75rem}}
@media(min-width:1536px){.shelf{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:3.75rem 2.25rem}}

.book-card{cursor:pointer;display:flex;flex-direction:column;align-items:center;text-align:center;outline:none}
.book-stage{
  width:100%;aspect-ratio:3/4;position:relative;display:flex;align-items:center;justify-content:center;
  border-radius:18px;
}
.book-stage::before{
  content:"";position:absolute;inset:0;border-radius:18px;background:var(--stage,var(--mist));
  transition:transform .35s ease;
}
.book-card:hover .book-stage::before,.book-card:focus-visible .book-stage::before{transform:scale(1.03)}
.book{
  position:relative;width:78%;aspect-ratio:3/4.2;
  transform:rotate(var(--tilt,0deg));transition:transform .4s cubic-bezier(.2,.8,.2,1),box-shadow .4s;
  box-shadow:0 1px 0 rgba(255,255,255,.4) inset, 2px 3px 0 rgba(39,57,55,.18), 8px 14px 22px -6px rgba(39,57,55,.45);
  border-radius:2px 5px 5px 2px;background:var(--paper-2);overflow:hidden;
}
.book-card:hover .book,.book-card:focus-visible .book{transform:rotate(0) translateY(-8px) scale(1.04);
  box-shadow:2px 3px 0 rgba(39,57,55,.18), 14px 26px 30px -8px rgba(39,57,55,.5)}
.book::before{content:"";position:absolute;inset:0 auto 0 0;width:9%;z-index:3;
  background:linear-gradient(90deg,rgba(0,0,0,.28),rgba(255,255,255,.12) 55%,rgba(0,0,0,.06));}
.book::after{content:"";position:absolute;inset:0;z-index:4;pointer-events:none;
  box-shadow:inset 0 0 28px rgba(110,80,40,.35);
  background:linear-gradient(135deg,rgba(255,240,210,.14),transparent 40%,rgba(80,50,20,.12));
  mix-blend-mode:multiply;}
.book img{width:100%;height:100%;object-fit:cover;display:block;
  filter:sepia(.18) saturate(.92) contrast(.96);}

/* ปกสำรอง */
.art{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:12% 12% 10% 16%;color:var(--fg);background:var(--bg);text-align:center}
.art .frame{position:absolute;inset:6% 6% 6% 12%;border:1px solid currentColor;opacity:.45;pointer-events:none}
.art .frame::after{content:"";position:absolute;inset:4px;border:1px solid currentColor;opacity:.6}
.art .bloom{position:absolute;width:120%;right:-45%;bottom:-30%;opacity:.16;color:var(--fg);transform:rotate(var(--rot,0deg))}
.art .code{font-size:.55rem;letter-spacing:.28em;opacity:.85;z-index:2}
.art .t{font-family:'Chonburi','Prompt',serif;line-height:1.35;z-index:2;font-size:clamp(.72rem,1.15vw + .35rem,1.05rem);
  display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}
.art .orn{width:22px;height:22px;z-index:2;opacity:.9}

/* ป้ายใต้เล่ม */
.tag-card{
  margin-top:.9rem;width:100%;background:var(--paper-2);border:1px solid var(--line);border-radius:6px;
  padding:.6rem .75rem .65rem;position:relative;transition:border-color .25s,transform .25s;
  background-image:repeating-linear-gradient(transparent 0 21px,rgba(155,113,80,.12) 21px 22px);
}
.tag-card::before{content:"";position:absolute;top:50%;left:7px;width:6px;height:6px;border-radius:50%;background:var(--paper);box-shadow:inset 0 1px 1px rgba(0,0,0,.25);transform:translateY(-50%)}
.book-card:hover .tag-card{border-color:var(--brown);transform:translateY(-2px)}
.tag-card h3{font-size:.8rem;line-height:1.4;font-weight:500;margin:0;padding-left:.5rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.8em}
.tag-meta{display:flex;justify-content:space-between;align-items:center;font-size:.65rem;color:var(--brown);margin-top:.3rem;padding-left:.5rem;font-weight:500;letter-spacing:.04em}
.tag-meta .go{color:var(--ink);opacity:0;transform:translateX(-4px);transition:.25s}
.book-card:hover .tag-meta .go{opacity:1;transform:none}

/* ===== Search ===== */
.search{display:flex;gap:.6rem;max-width:34rem}
.search .field{position:relative;flex:1}
.search input{width:100%;padding:.9rem 1.1rem .9rem 2.8rem;border-radius:999px;border:2px solid transparent;background:var(--paper-2);color:var(--ink);font:500 .9rem 'Prompt';outline:none;transition:.2s}
.search input:focus{border-color:var(--peach)}
.search i.s{position:absolute;left:1.1rem;top:50%;transform:translateY(-50%);color:var(--brown)}
.btn-peach{background:var(--peach);color:var(--ink);border:0;border-radius:999px;padding:0 1.1rem;font:600 .8rem 'Prompt';cursor:pointer;white-space:nowrap;transition:.2s}
.btn-peach:hover{background:#f6d0bb;transform:rotate(-2deg) scale(1.04)}

/* ===== Chat (ล็อกหน้าจอแล้วใช้เลื่อนเฉพาะแชท) ===== */
#view-chat{position:fixed; inset:0; z-index:50; background:var(--paper); display:flex; flex-direction:column}
#view-chat.hidden{display:none}
.chat-head{background:var(--ink);color:var(--paper);position:relative; z-index:40; flex-shrink:0; box-shadow: 0 4px 12px rgba(0,0,0,0.15);}
.chat-head .mini{width:52px;flex-shrink:0}
.mini .book{width:100%;--tilt:-3deg}
.mini .art{padding:10% 8% 8% 14%}.mini .art .t,.mini .art .code,.mini .art .orn{display:none}
.mini .art .frame{display:none}
.bubble-bot{
  background:var(--paper-2);border:1px solid var(--line);border-left:4px solid var(--peach);
  border-radius:4px 18px 18px 18px;font-family:'Noto Serif Thai','Prompt',serif;line-height:1.85;
  box-shadow:0 6px 18px -10px rgba(39,57,55,.35);
  background-image:repeating-linear-gradient(transparent 0 29px,rgba(155,113,80,.08) 29px 30px);
}
.bubble-user{background:var(--ink);color:var(--mist);border-radius:18px 18px 4px 18px;box-shadow:0 6px 18px -10px rgba(39,57,55,.6)}
.page-stamp{display:inline-flex;align-items:center;gap:.35rem;margin:.7rem .35rem 0 0;padding:.2rem .65rem;border:1px dashed var(--brown);border-radius:999px;font:500 .68rem 'Prompt';color:var(--brown);background:rgba(240,192,166,.25);transform:rotate(-1.5deg)}
.who{font:600 .62rem 'Prompt';letter-spacing:.18em;color:var(--brown);margin-bottom:.4rem;display:flex;align-items:center;gap:.4rem}
.who i{color:var(--sage)}
.qchip{flex-shrink:0;padding:.45rem 1rem;background:var(--paper-2);border:1px solid var(--line);border-radius:999px;font:500 .78rem 'Prompt';color:var(--ink);cursor:pointer;transition:.2s}
.qchip:hover{background:var(--peach);border-color:var(--peach)}
.composer{display:flex;align-items:flex-end;background:#fff;border-radius:26px;border:2px solid var(--line);padding:.35rem;transition:.2s}
.composer:focus-within{border-color:var(--sage);box-shadow:0 10px 30px -14px rgba(39,57,55,.45)}
.composer textarea{flex:1;border:0;outline:0;resize:none;background:transparent;padding:.75rem 1rem;font:500 .92rem 'Prompt';color:var(--ink);min-height:46px;max-height:120px}
.composer button{width:42px;height:42px;border-radius:50%;border:0;background:var(--ink);color:var(--peach);cursor:pointer;transition:.2s;flex-shrink:0}
.composer button:hover:not(:disabled){transform:scale(1.07) rotate(-8deg)}
.composer button:disabled{background:var(--mist);color:var(--sage);cursor:default}
.dots span{width:7px;height:7px;border-radius:50%;background:var(--brown);display:inline-block;animation:b 1.2s infinite}
.dots span:nth-child(2){animation-delay:.15s}.dots span:nth-child(3){animation-delay:.3s}
@keyframes b{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-5px);opacity:1}}

/* ===== History drawer ===== */
.hist-overlay{position:fixed;inset:0;z-index:60;background:rgba(39,57,55,.45);opacity:0;pointer-events:none;transition:opacity .25s}
.hist-overlay.open{opacity:1;pointer-events:auto}
.hist-drawer{position:fixed;top:0;bottom:0;left:0;width:min(340px,88vw);z-index:65;background:var(--paper-2);border-right:1px solid var(--line);
  display:flex;flex-direction:column;transform:translateX(-102%);transition:transform .3s cubic-bezier(.2,.8,.2,1);box-shadow:20px 0 40px -20px rgba(39,57,55,.4)}
.hist-drawer.open{transform:none}
.newchat{width:100%;padding:.7rem 1rem;border-radius:14px;border:0;background:var(--ink);color:var(--peach);font:600 .85rem 'Prompt';cursor:pointer;transition:.2s}
.newchat:hover{transform:translateY(-1px)}
.seg{flex:1;padding:.4rem;border-radius:999px;border:1px solid var(--line);background:transparent;font:500 .75rem 'Prompt';color:var(--ink);cursor:pointer}
.seg.on{background:var(--peach);border-color:var(--peach)}
.hist-item{display:flex;align-items:center;gap:.5rem;width:100%;padding:.65rem .75rem;border-radius:12px;cursor:pointer;color:var(--ink);transition:.15s;outline:none}
.hist-item:hover,.hist-item:focus-visible{background:var(--mist)}
.hist-item.cur{background:rgba(240,192,166,.45)}
.hist-item .tt{font:500 .82rem 'Prompt';display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.hist-item .mm{font:400 .68rem 'Prompt';color:var(--brown);margin-top:.15rem}
.hist-del{border:0;background:transparent;color:var(--brown);cursor:pointer;padding:.4rem .55rem;border-radius:8px;font:500 .7rem 'Prompt';flex-shrink:0;opacity:.6}
.hist-del:hover{opacity:1;background:rgba(155,113,80,.15)}
.hist-del.sure{background:#b4533f;color:#fff;opacity:1}
@keyframes up{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.up{animation:up .45s ease-out both}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}