*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#0d0d0d;--paper:#f5f0e8;--cream:#ede8dc;
  --gold:#b8860b;--gold-lt:#d4a017;
  --chain:#1a3a5c;--chain-lt:#2563a8;
  --muted:#6b6050;--danger:#8b2020;--success:#1a5c3a;
  --border:rgba(13,13,13,0.12);--r:4px;
  --shadow:0 2px 16px rgba(13,13,13,0.10);
}
body{font-family:'DM Sans',sans-serif;background:var(--paper);color:var(--ink);min-height:100vh;font-size:15px}
h1,h2,h3{font-family:'Playfair Display',serif}
.mono{font-family:'DM Mono',monospace;font-size:.78em}

/* Header */
header{background:var(--ink);color:var(--paper);padding:0 2rem;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;border-bottom:2px solid var(--gold)}
.logo{font-family:'Playfair Display',serif;font-size:1.5rem;letter-spacing:.04em}
.logo span{color:var(--gold)}
.header-right{display:flex;align-items:center;gap:.8rem;flex-wrap:wrap}
#wallet-badge{font-family:'DM Mono',monospace;font-size:.72em;background:rgba(184,134,11,.15);border:1px solid var(--gold);color:var(--gold-lt);padding:4px 10px;border-radius:2px;display:none}
#user-badge{font-size:.85em;color:var(--paper);opacity:.8;display:none}

/* Nav */
nav{background:var(--cream);border-bottom:1px solid var(--border);display:flex;padding:0 2rem;overflow-x:auto}
nav button{background:none;border:none;border-bottom:3px solid transparent;color:var(--muted);cursor:pointer;font-family:'DM Sans',sans-serif;font-size:.85em;font-weight:500;letter-spacing:.06em;padding:13px 18px;text-transform:uppercase;transition:all .2s;white-space:nowrap}
nav button:hover{color:var(--ink)}
nav button.active{color:var(--ink);border-bottom-color:var(--gold)}

/* Main */
main{max-width:1100px;margin:0 auto;padding:2.5rem 2rem}
.page{display:none}
.page.active{display:block}

/* Cards */
.card{background:#fff;border:1px solid var(--border);border-radius:var(--r);box-shadow:var(--shadow);padding:2rem}
.card-title{font-size:1.4rem;margin-bottom:1.4rem;display:flex;align-items:center;gap:.6rem}

/* Auth */
.auth-wrap{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
@media(max-width:700px){.auth-wrap{grid-template-columns:1fr}}

/* Forms */
.form-group{margin-bottom:1.1rem}
label{display:block;font-size:.76em;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:5px}
input,select,textarea{width:100%;border:1px solid var(--border);border-radius:var(--r);background:var(--paper);color:var(--ink);font-family:'DM Sans',sans-serif;font-size:.95em;padding:10px 14px;transition:border-color .2s;outline:none}
input:focus,select:focus{border-color:var(--chain-lt);background:#fff}
.wallet-input{font-family:'DM Mono',monospace!important;font-size:.78em!important}

/* Buttons */
.btn{border:none;border-radius:var(--r);cursor:pointer;font-family:'DM Sans',sans-serif;font-size:.85em;font-weight:500;letter-spacing:.06em;padding:10px 20px;text-transform:uppercase;transition:all .2s}
.btn-primary{background:var(--ink);color:var(--paper)}.btn-primary:hover{background:var(--chain)}
.btn-gold{background:var(--gold);color:#fff}.btn-gold:hover{background:var(--gold-lt)}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--ink)}.btn-outline:hover{border-color:var(--ink)}
.btn-danger{background:var(--danger);color:#fff}
.btn-success{background:var(--success);color:#fff}
.btn-chain{background:var(--chain);color:#fff}.btn-chain:hover{background:var(--chain-lt)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-sm{padding:6px 13px;font-size:.76em}
.btn-full{width:100%}

/* Book Grid */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:1.5rem;margin-top:1.5rem}
.book-card{background:#fff;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:transform .2s,box-shadow .2s}
.book-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(13,13,13,.14)}
.book-cover{height:155px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.book-cover-inner{text-align:center;color:var(--paper);padding:1rem}
.cover-title{font-family:'Playfair Display',serif;font-size:.92rem;line-height:1.3}
.cover-author{font-size:.7em;opacity:.6;margin-top:5px}
.book-cover-accent{position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--gold)}
.book-info{padding:.9rem}
.book-price{font-family:'DM Mono',monospace;font-size:.8em;color:var(--chain);font-weight:500}
.book-id{font-size:.68em;color:var(--muted);margin-bottom:6px}
.book-actions{display:flex;gap:5px;margin-top:8px;flex-wrap:wrap}

/* My Books */
.my-book-item{display:grid;grid-template-columns:1fr auto;align-items:center;gap:1rem;padding:1.2rem;border:1px solid var(--border);border-radius:var(--r);background:#fff;margin-bottom:.8rem}
.my-book-title{font-family:'Playfair Display',serif;font-size:1.05rem}
.my-book-meta{font-size:.76em;color:var(--muted);margin-top:3px}
.tag{display:inline-block;font-size:.66em;font-weight:500;letter-spacing:.06em;padding:2px 7px;border-radius:2px;text-transform:uppercase;margin-left:5px}
.tag-sale{background:#fff3cd;color:#7a5a00;border:1px solid #e6c200}
.tag-owned{background:#d4edda;color:#1a5c3a;border:1px solid #57b07c}
.tag-drm{background:#e8d5f5;color:#5a1a7c;border:1px solid #b07cd4}

/* Alerts */
.alert{border-radius:var(--r);font-size:.86em;margin-bottom:1rem;padding:11px 15px}
.alert-success{background:#d4edda;border:1px solid #57b07c;color:#1a5c3a}
.alert-error{background:#f8d7da;border:1px solid #e07070;color:var(--danger)}
.alert-info{background:#d1ecf1;border:1px solid #5db8cc;color:#0c5460}

/* Tx hash */
.tx-hash{font-family:'DM Mono',monospace;font-size:.68em;color:var(--chain-lt);word-break:break-all;margin-top:3px}

/* Section */
.section-header{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:1.5rem}
.section-title{font-family:'Playfair Display',serif;font-size:1.6rem}
.empty-state{text-align:center;padding:3rem;color:var(--muted)}
.empty-icon{font-size:3rem;margin-bottom:1rem}
.divider{border:none;border-top:1px solid var(--border);margin:1.5rem 0}

/* Chain badge */
.chain-badge{display:inline-flex;align-items:center;gap:5px;font-family:'DM Mono',monospace;font-size:.7em;background:var(--chain);color:#fff;padding:3px 8px;border-radius:2px}
.chain-dot{width:6px;height:6px;background:#4ade80;border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* Spinner */
.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;vertical-align:middle;margin-right:5px}
@keyframes spin{to{transform:rotate(360deg)}}

/* Modal */
.modal-overlay{position:fixed;inset:0;background:rgba(13,13,13,.6);backdrop-filter:blur(3px);z-index:200;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .2s}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal{background:#fff;border-radius:6px;border-top:4px solid var(--gold);box-shadow:0 20px 60px rgba(13,13,13,.3);max-width:500px;width:92%;padding:2rem;transform:translateY(20px);transition:transform .2s}
.modal-overlay.open .modal{transform:translateY(0)}
.modal-title{font-family:'Playfair Display',serif;font-size:1.3rem;margin-bottom:1.2rem}
.modal-actions{display:flex;gap:.8rem;margin-top:1.4rem;justify-content:flex-end}

/* Tab toggle */
.tab-toggle{display:flex;border:1px solid var(--border);border-radius:var(--r);overflow:hidden;margin-bottom:1rem}
.tab-toggle button{flex:1;background:none;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;font-size:.8em;font-weight:500;padding:9px;transition:all .2s;color:var(--muted)}
.tab-toggle button.active{background:var(--ink);color:var(--paper)}

/* PDF Viewer */
.pdf-viewer{position:fixed;inset:0;background:rgba(5,10,20,.95);z-index:300;display:none;flex-direction:column}
.pdf-viewer.open{display:flex}
.pdf-toolbar{background:#111;color:#fff;padding:.8rem 1.5rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(184,134,11,.4)}
.pdf-toolbar-title{font-family:'Playfair Display',serif;font-size:1.1rem;color:var(--gold-lt)}
.pdf-frame{flex:1;border:none;width:100%;background:#fff}
.drm-badge{font-family:'DM Mono',monospace;font-size:.68em;background:rgba(184,134,11,.15);border:1px solid var(--gold);color:var(--gold-lt);padding:3px 9px;border-radius:2px}

/* Marketplace item */
.listing-item{display:grid;grid-template-columns:1fr auto;align-items:center;gap:1rem;padding:1.2rem;border:1px solid var(--border);border-radius:var(--r);background:#fff;margin-bottom:.8rem}
.listing-price{font-family:'DM Mono',monospace;font-size:.9em;color:var(--chain);font-weight:500}

/* Info box */
.info-box{background:var(--cream);border-left:3px solid var(--gold);border-radius:0 var(--r) var(--r) 0;padding:1rem 1.2rem;font-size:.82em;color:var(--muted);line-height:1.6;margin-bottom:1.5rem}
.info-box strong{color:var(--ink)}