:root{
  --bg:#f7f3ec; --card:#ffffff; --card2:#f1ebe0; --ink:#2c2620; --muted:#8a7f70; --faint:#b8ad9c;
  --accent:#c0663a; --accent2:#e08a5a; --accent-soft:#f6e6da; --ok:#5e8c6a; --gold:#c99a3f;
  --border:#eadfce; --shadow:0 14px 36px rgba(120,90,50,.12); --r:18px; --r-sm:13px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
body{font-family:'Lato',system-ui,sans-serif;background:var(--bg);color:var(--ink);min-height:100vh;display:flex;justify-content:center;padding:16px;padding-bottom:40px}
.app{width:100%;max-width:600px;display:flex;flex-direction:column;gap:14px}
h1,h2,h3{font-family:'Playfair Display',Georgia,serif}

.topbar{display:flex;justify-content:space-between;align-items:center;padding-top:calc(env(safe-area-inset-top) + 4px)}
.brand h1{font-size:26px;font-weight:800;letter-spacing:-.01em}
.loc{display:flex;align-items:center;gap:5px;font-size:12.5px;color:var(--muted);margin-top:3px;font-weight:700}
.loc svg{width:14px;height:14px;color:var(--accent)}
.fab{width:46px;height:46px;border-radius:15px;border:none;background:var(--accent);color:#fff;display:grid;place-items:center;cursor:pointer;transition:.2s;box-shadow:0 6px 16px rgba(192,102,58,.35)}
.fab:hover{transform:translateY(-2px)}
.fab svg{width:22px;height:22px}

.search{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:12px 15px;box-shadow:var(--shadow)}
.search svg{width:18px;height:18px;color:var(--muted);flex-shrink:0}
.search input{flex:1;border:none;background:none;outline:none;font-size:15px;font-family:inherit;color:var(--ink)}

.match-banner{background:linear-gradient(135deg,var(--accent-soft),#fbeee2);border:1px solid var(--accent2);border-radius:var(--r-sm);padding:12px 15px;font-size:13.5px;color:#9a4e28;font-weight:700;display:flex;align-items:center;gap:9px}
.match-banner svg{width:18px;height:18px;flex-shrink:0}

.tabs{display:flex;gap:6px;background:var(--card2);border-radius:12px;padding:5px}
.tab{flex:1;border:none;background:transparent;color:var(--muted);border-radius:9px;padding:9px 4px;font-size:12.5px;font-weight:700;cursor:pointer;transition:.2s;font-family:inherit}
.tab.active{background:var(--card);color:var(--ink);box-shadow:0 2px 8px rgba(120,90,50,.1)}

main{display:flex;flex-direction:column;gap:12px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.book{background:var(--card);border:1px solid var(--border);border-radius:var(--r-sm);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;animation:rise .3s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.cover{aspect-ratio:3/4;display:flex;flex-direction:column;justify-content:space-between;padding:14px;color:#fff;position:relative}
.cover .c-title{font-family:'Playfair Display',serif;font-size:16px;font-weight:700;line-height:1.2;text-shadow:0 1px 6px rgba(0,0,0,.25)}
.cover .c-author{font-size:11px;opacity:.9;font-weight:700}
.cover .c-badge{position:absolute;top:10px;right:10px;background:rgba(255,255,255,.92);color:var(--accent);font-size:10px;font-weight:800;padding:3px 8px;border-radius:7px}
.book-b{padding:11px 12px;display:flex;flex-direction:column;gap:7px}
.book-meta{font-size:11.5px;color:var(--muted);font-weight:700;display:flex;align-items:center;gap:5px}
.book-meta svg{width:12px;height:12px}
.b-btn{border:1px solid var(--accent);background:var(--accent-soft);color:var(--accent);border-radius:9px;padding:8px;font-size:12.5px;font-weight:700;cursor:pointer;transition:.2s;font-family:inherit}
.b-btn:hover{background:var(--accent);color:#fff}
.b-btn.sent{background:var(--ok);border-color:var(--ok);color:#fff;pointer-events:none}

/* estantería / listas verticales */
.row{background:var(--card);border:1px solid var(--border);border-radius:var(--r-sm);padding:12px;display:flex;gap:13px;align-items:center;box-shadow:var(--shadow);animation:rise .3s ease}
.row .mini-cover{width:46px;height:62px;border-radius:7px;flex-shrink:0;display:flex;align-items:flex-end;padding:6px;color:#fff;font-size:9px;font-weight:700;line-height:1.1;overflow:hidden}
.row-main{flex:1;min-width:0}
.row-title{font-family:'Playfair Display',serif;font-size:16px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row-sub{font-size:12.5px;color:var(--muted);margin-top:3px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.chip{font-size:10.5px;font-weight:700;padding:2px 8px;border-radius:6px;background:var(--card2);color:var(--muted)}
.chip.avail{background:rgba(94,140,106,.16);color:var(--ok)}
.chip.match{background:var(--accent-soft);color:var(--accent)}
.row-act{background:none;border:none;color:var(--faint);font-size:20px;cursor:pointer;padding:0 4px}
.row-act:hover{color:var(--accent)}
.empty{text-align:center;color:var(--faint);padding:44px 20px;font-size:14px}
.empty svg{width:44px;height:44px;opacity:.4;margin-bottom:10px}

.icon-btn{width:34px;height:34px;border-radius:10px;border:1px solid var(--border);background:var(--card2);color:var(--ink);display:grid;place-items:center;cursor:pointer;font-size:15px}
.backdrop{position:fixed;inset:0;background:rgba(44,38,32,.42);opacity:0;pointer-events:none;transition:.3s;z-index:40}
.backdrop.on{opacity:1;pointer-events:auto}
.sheet{position:fixed;left:50%;bottom:0;transform:translate(-50%,102%);width:100%;max-width:600px;background:var(--card);border-radius:24px 24px 0 0;border:1px solid var(--border);border-bottom:none;padding:22px 20px calc(26px + env(safe-area-inset-bottom));z-index:50;transition:transform .35s cubic-bezier(.4,0,.2,1);max-height:88vh;overflow-y:auto;box-shadow:0 -20px 50px rgba(120,90,50,.2)}
.sheet.on{transform:translate(-50%,0)}
.sheet-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.sheet-head h2{font-size:21px;font-weight:800}
.seg{display:flex;gap:8px;background:var(--card2);border-radius:11px;padding:5px;margin-bottom:16px}
.seg-b{flex:1;border:none;background:transparent;color:var(--muted);border-radius:8px;padding:10px;font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;transition:.2s}
.seg-b.active{background:var(--card);color:var(--ink);box-shadow:0 2px 6px rgba(0,0,0,.06)}
.field{display:flex;flex-direction:column;gap:7px;margin-bottom:14px}
.field>span{font-size:12.5px;font-weight:700;color:var(--muted)}
.field input,.field select{background:var(--card2);border:1px solid var(--border);border-radius:11px;padding:12px 13px;font-size:15px;font-family:inherit;color:var(--ink);outline:none;width:100%}
.field input:focus,.field select:focus{border-color:var(--accent)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field.check{flex-direction:row;justify-content:space-between;align-items:center}
.field.check span{font-size:14px;color:var(--ink);font-weight:700}
.field.check input[type=checkbox]{width:46px;height:26px;appearance:none;background:var(--card2);border:1px solid var(--border);border-radius:999px;position:relative;cursor:pointer;transition:.2s}
.field.check input[type=checkbox]:checked{background:var(--accent)}
.field.check input[type=checkbox]::after{content:'';position:absolute;width:20px;height:20px;border-radius:50%;background:#fff;top:2px;left:2px;transition:.2s}
.field.check input[type=checkbox]:checked::after{left:22px}
.hidden{display:none}
.save-btn{width:100%;border:none;border-radius:13px;padding:15px;font-weight:800;color:#fff;background:var(--accent);cursor:pointer;font-size:15px;font-family:inherit;margin-top:4px}
.save-btn:disabled{opacity:.5;cursor:default}
.swap-intro{font-size:14px;color:var(--muted);margin-bottom:16px;line-height:1.5}
.swap-intro b{color:var(--ink)}
.swap-sub{font-size:14px;font-weight:700;margin-bottom:12px}
.offer-list{display:flex;flex-direction:column;gap:9px;margin-bottom:16px}
.offer{display:flex;gap:11px;align-items:center;background:var(--card2);border:2px solid transparent;border-radius:11px;padding:10px;cursor:pointer;transition:.2s}
.offer.sel{border-color:var(--accent);background:var(--accent-soft)}
.offer .mini-cover{width:36px;height:48px;font-size:8px}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,120px);background:var(--ink);color:var(--bg);padding:12px 18px;border-radius:12px;font-size:13.5px;font-weight:700;z-index:60;transition:transform .3s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow);max-width:90vw;text-align:center}
.toast.on{transform:translate(-50%,0)}