:root {
  --bg: #0a0a0f; --bg-elevated: #111118; --surface: #16161f; --surface-hover: #1c1c28;
  --border: rgba(255,255,255,0.06); --border-hover: rgba(255,255,255,0.12);
  --text: #f1f5f9; --text-muted: #94a3b8; --text-dim: #64748b;
  --primary: #f59e0b; --primary-hover: #fbbf24; --primary-glow: rgba(245,158,11,0.15);
  --accent: #0ea5e9; --accent-glow: rgba(14,165,233,0.15);
  --success: #22c55e; --danger: #ef4444;
  --shadow: 0 4px 24px rgba(0,0,0,0.4); --shadow-lg: 0 8px 40px rgba(0,0,0,0.5); --shadow-glow: 0 0 40px rgba(245,158,11,0.08);
  --radius: 16px; --radius-sm: 12px; --radius-xs: 8px;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif; background:var(--bg); color:var(--text); line-height:1.6; -webkit-font-smoothing:antialiased; }
.container { max-width:1280px; margin:0 auto; padding:0 32px; }

/* Header */
.site-header { background:rgba(22,22,31,0.85); backdrop-filter:blur(20px); border-bottom:1px solid var(--border); position:sticky; top:0; z-index:100; }
.header-inner { display:flex; align-items:center; justify-content:space-between; height:72px; }
.logo { display:flex; align-items:center; gap:12px; text-decoration:none; color:var(--text); font-weight:800; font-size:1.4rem; letter-spacing:-0.02em; }
.logo-icon { width:36px; height:36px; background:linear-gradient(135deg,var(--primary),#d97706); border-radius:10px; display:flex; align-items:center; justify-content:center; font-size:1.1rem; color:var(--bg); font-weight:900; }
.main-nav { display:flex; gap:32px; align-items:center; }
.main-nav a { text-decoration:none; color:var(--text-muted); font-weight:500; font-size:0.95rem; transition:color 0.2s; position:relative; }
.main-nav a:hover { color:var(--text); }
.main-nav a::after { content:''; position:absolute; bottom:-4px; left:0; width:0; height:2px; background:var(--primary); transition:width 0.3s; border-radius:2px; }
.main-nav a:hover::after { width:100%; }
.cart-link { display:flex; align-items:center; gap:8px; background:var(--surface); padding:8px 18px; border-radius:100px; border:1px solid var(--border); transition:all 0.2s; }
.cart-link:hover { border-color:var(--border-hover); background:var(--surface-hover); }
.cart-badge { background:var(--primary); color:var(--bg); font-size:0.75rem; padding:2px 8px; border-radius:100px; font-weight:700; }

/* Buttons */
.btn { display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:12px 28px; border-radius:var(--radius-xs); font-weight:600; font-size:0.95rem; cursor:pointer; border:none; text-decoration:none; transition:all 0.25s cubic-bezier(0.4,0,0.2,1); position:relative; overflow:hidden; }
.btn::before { content:''; position:absolute; inset:0; background:linear-gradient(135deg,transparent,rgba(255,255,255,0.1),transparent); transform:translateX(-100%); transition:transform 0.5s; }
.btn:hover::before { transform:translateX(100%); }
.btn-primary { background:linear-gradient(135deg,var(--primary),#d97706); color:var(--bg); box-shadow:0 4px 20px rgba(245,158,11,0.3); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 30px rgba(245,158,11,0.4); }
.btn-outline { background:transparent; border:1.5px solid var(--border); color:var(--text); }
.btn-outline:hover { border-color:var(--primary); color:var(--primary); }
.btn-ghost { background:transparent; color:var(--text-muted); }
.btn-ghost:hover { color:var(--text); }
.btn-light { background:var(--surface); color:var(--text); border:1px solid var(--border); }
.btn-light:hover { background:var(--surface-hover); }
.btn-danger { background:var(--danger); color:white; }
.btn-success { background:var(--success); color:white; }
.btn-sm { padding:8px 18px; font-size:0.85rem; }
.btn-lg { padding:16px 36px; font-size:1.05rem; }
.btn-block { width:100%; }

/* Hero */
.hero { padding:120px 0 80px; text-align:center; position:relative; overflow:hidden; }
.hero::before { content:''; position:absolute; top:-50%; left:-50%; width:200%; height:200%; background:radial-gradient(circle at 50% 50%,rgba(245,158,11,0.08),transparent 50%); pointer-events:none; }
.hero-content { position:relative; z-index:1; }
.hero-title { font-size:3.5rem; font-weight:800; line-height:1.1; margin-bottom:20px; letter-spacing:-0.03em; background:linear-gradient(135deg,var(--text) 0%,var(--primary) 100%); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero-subtitle { font-size:1.2rem; color:var(--text-muted); max-width:520px; margin:0 auto 40px; line-height:1.7; }
.hero-cta { display:flex; gap:16px; justify-content:center; }

/* Trust */
.trust-section { padding:48px 0; background:var(--bg-elevated); border-bottom:1px solid var(--border); }
.trust-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:32px; margin-bottom:20px; }
.trust-item { text-align:center; padding:24px; border-radius:var(--radius-sm); background:var(--surface); border:1px solid var(--border); transition:all 0.3s; }
.trust-item:hover { border-color:var(--border-hover); transform:translateY(-2px); }
.trust-icon { width:48px; height:48px; background:var(--primary-glow); border-radius:12px; display:flex; align-items:center; justify-content:center; margin:0 auto 12px; font-size:1.3rem; color:var(--primary); }
.trust-value { font-size:1.6rem; font-weight:700; color:var(--text); margin-bottom:4px; }
.trust-label { font-size:0.85rem; color:var(--text-dim); }
.trust-note { text-align:center; color:var(--text-dim); font-size:0.9rem; }

/* Bundle Banner */
.bundle-banner { padding:32px 0; }
.bundle-box { background:linear-gradient(135deg,rgba(245,158,11,0.1),rgba(217,119,6,0.05)); border:1px solid rgba(245,158,11,0.2); border-radius:var(--radius); padding:32px; display:flex; align-items:center; gap:24px; flex-wrap:wrap; position:relative; overflow:hidden; }
.bundle-box::before { content:''; position:absolute; top:0; left:0; right:0; height:1px; background:linear-gradient(90deg,transparent,var(--primary),transparent); }
.bundle-badge { background:var(--primary); color:var(--bg); padding:6px 16px; border-radius:100px; font-size:0.8rem; font-weight:700; text-transform:uppercase; letter-spacing:0.05em; }

/* Books Grid */
.books-section { padding:80px 0; }
.section-header { text-align:center; margin-bottom:56px; }
.section-header h2 { font-size:2.2rem; font-weight:700; margin-bottom:12px; letter-spacing:-0.02em; }
.section-header p { color:var(--text-muted); font-size:1.05rem; }
.books-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:28px; }
.book-card { background:var(--surface); border-radius:var(--radius); border:1px solid var(--border); overflow:hidden; transition:all 0.4s cubic-bezier(0.4,0,0.2,1); opacity:0; animation:fadeUp 0.7s ease forwards; }
@keyframes fadeUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
.book-card:hover { transform:translateY(-6px); border-color:var(--border-hover); box-shadow:var(--shadow-lg),var(--shadow-glow); }
.book-cover { position:relative; aspect-ratio:3/4; overflow:hidden; background:var(--bg-elevated); }
.book-cover img { width:100%; height:100%; object-fit:cover; transition:transform 0.5s; }
.book-card:hover .book-cover img { transform:scale(1.05); }
.book-overlay { position:absolute; inset:0; background:rgba(10,10,15,0.7); display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity 0.3s; backdrop-filter:blur(4px); }
.book-card:hover .book-overlay { opacity:1; }
.book-info { padding:24px; }
.book-title { font-size:1.1rem; font-weight:600; margin-bottom:8px; color:var(--text); }
.book-desc { font-size:0.9rem; color:var(--text-dim); display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; margin-bottom:20px; line-height:1.5; }
.book-footer { display:flex; align-items:center; justify-content:space-between; }
.book-price { font-weight:700; font-size:1.2rem; color:var(--primary); }

/* Bundle Promo */
.bundle-section { padding:60px 0 100px; }
.bundle-promo { background:var(--surface); border-radius:var(--radius); padding:56px; display:flex; align-items:center; justify-content:space-between; gap:48px; border:1px solid var(--border); position:relative; overflow:hidden; }
.bundle-promo::before { content:''; position:absolute; top:0; left:0; width:100%; height:3px; background:linear-gradient(90deg,var(--primary),var(--accent),var(--primary)); }
.bundle-promo-content { flex:1; }
.bundle-promo-content h2 { font-size:2rem; font-weight:700; margin-bottom:16px; }
.bundle-promo-content p { color:var(--text-muted); margin-bottom:28px; line-height:1.7; font-size:1.05rem; }
.book-stack { display:flex; align-items:center; justify-content:center; gap:-20px; position:relative; }
.stack-book { width:80px; height:100px; background:var(--bg-elevated); border-radius:8px; border:2px solid var(--border); display:flex; align-items:center; justify-content:center; font-size:2rem; color:var(--primary); font-weight:700; box-shadow:var(--shadow); position:relative; }
.stack-book:nth-child(1) { transform:rotate(-8deg) translateX(10px); z-index:1; }
.stack-book:nth-child(2) { transform:translateY(-10px); z-index:2; background:var(--surface-hover); border-color:var(--primary); }
.stack-book:nth-child(3) { transform:rotate(8deg) translateX(-10px); z-index:1; }

/* Cart */
.cart-section { padding:80px 0; }
.page-title { font-size:2.4rem; font-weight:700; margin-bottom:40px; letter-spacing:-0.02em; }
.cart-layout { display:grid; grid-template-columns:1fr 380px; gap:40px; }
.cart-item { display:flex; align-items:center; gap:20px; background:var(--surface); padding:20px; border-radius:var(--radius-sm); margin-bottom:16px; border:1px solid var(--border); transition:all 0.2s; }
.cart-item:hover { border-color:var(--border-hover); }
.cart-item-img { width:64px; height:88px; object-fit:cover; border-radius:var(--radius-xs); }
.cart-item-info { flex:1; }
.cart-item-info h3 { font-size:1rem; font-weight:600; margin-bottom:4px; }
.cart-item-desc { font-size:0.85rem; color:var(--text-dim); }
.cart-item-price { font-weight:700; color:var(--primary); font-size:1.1rem; }
.cart-remove { width:36px; height:36px; border-radius:50%; border:1px solid var(--border); background:transparent; color:var(--text-muted); cursor:pointer; font-size:1.3rem; transition:all 0.2s; display:flex; align-items:center; justify-content:center; }
.cart-remove:hover { background:rgba(239,68,68,0.1); color:var(--danger); border-color:var(--danger); }
.cart-actions { display:flex; gap:16px; margin-top:24px; }
.cart-summary { background:var(--surface); padding:32px; border-radius:var(--radius); border:1px solid var(--border); height:fit-content; position:sticky; top:96px; }
.cart-summary h3 { margin-bottom:28px; font-size:1.2rem; font-weight:600; }
.summary-row { display:flex; justify-content:space-between; margin-bottom:16px; color:var(--text-muted); }
.summary-row.total { border-top:1px solid var(--border); padding-top:16px; font-size:1.3rem; font-weight:700; color:var(--text); }
.bundle-row { color:var(--success); font-weight:600; }
.bundle-saved { background:rgba(34,197,94,0.1); color:var(--success); padding:16px; border-radius:var(--radius-xs); text-align:center; font-weight:600; margin:20px 0; border:1px solid rgba(34,197,94,0.2); }
.summary-note { margin-top:24px; font-size:0.85rem; color:var(--text-dim); }
.empty-cart { text-align:center; padding:100px 20px; }
.empty-icon { width:80px; height:80px; background:var(--surface); border-radius:50%; display:flex; align-items:center; justify-content:center; margin:0 auto 24px; border:1px solid var(--border); font-size:2rem; color:var(--primary); }

/* Checkout */
.checkout-section { padding:80px 0; }
.checkout-layout { display:grid; grid-template-columns:1fr 400px; gap:48px; }
.form-card { background:var(--surface); padding:32px; border-radius:var(--radius); border:1px solid var(--border); margin-bottom:24px; }
.form-card h3 { margin-bottom:24px; font-size:1.1rem; font-weight:600; color:var(--text); }
.form-group { margin-bottom:24px; }
.form-group label { display:block; font-weight:500; font-size:0.9rem; margin-bottom:8px; color:var(--text-muted); }
.form-group input,.form-group textarea { width:100%; padding:14px; background:var(--bg-elevated); border:1px solid var(--border); border-radius:var(--radius-xs); font-family:inherit; font-size:0.95rem; color:var(--text); transition:all 0.2s; }
.form-group input:focus,.form-group textarea:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-glow); }
.form-group small { color:var(--text-dim); font-size:0.8rem; margin-top:6px; display:block; }
.crypto-options { display:flex; gap:12px; }
.crypto-option { flex:1; padding:20px 16px; background:var(--bg-elevated); border:2px solid var(--border); border-radius:var(--radius-xs); cursor:pointer; text-align:center; transition:all 0.2s; }
.crypto-option.active { border-color:var(--primary); background:rgba(245,158,11,0.05); }
.crypto-option:hover:not(.active) { border-color:var(--border-hover); }
.crypto-option input { display:none; }
.crypto-icon { font-size:1.6rem; font-weight:700; color:var(--primary); display:block; margin-bottom:6px; }
.crypto-name { font-weight:600; font-size:0.9rem; color:var(--text); }
.crypto-note { margin-top:16px; font-size:0.85rem; color:var(--text-dim); }
.checkout-summary { background:var(--surface); padding:32px; border-radius:var(--radius); border:1px solid var(--border); height:fit-content; }
.checkout-summary h3 { margin-bottom:24px; font-size:1.1rem; font-weight:600; }
.checkout-item { display:flex; gap:16px; margin-bottom:20px; }
.checkout-item img { width:48px; height:64px; object-fit:cover; border-radius:6px; }
.checkout-item-info { display:flex; flex-direction:column; }
.checkout-item-title { font-weight:500; font-size:0.95rem; color:var(--text); }
.checkout-item-price { color:var(--text-dim); font-size:0.85rem; }
.checkout-divider { border-top:1px solid var(--border); margin:20px 0; }
.discount { color:var(--success); font-weight:600; }
.checkout-trust { margin-top:24px; padding-top:20px; border-top:1px solid var(--border); }
.checkout-trust span { display:block; font-size:0.85rem; color:var(--text-dim); margin-bottom:6px; }

/* Payment Page */
.payment-section { padding:80px 0; }
.payment-card { max-width:560px; margin:0 auto; background:var(--surface); border-radius:var(--radius); border:1px solid var(--border); padding:48px; box-shadow:var(--shadow-lg); }
.payment-header { text-align:center; margin-bottom:36px; }
.payment-step { width:48px; height:48px; background:linear-gradient(135deg,var(--primary),#d97706); border-radius:50%; display:flex; align-items:center; justify-content:center; margin:0 auto 16px; font-size:1.2rem; font-weight:700; color:var(--bg); }
.payment-header h1 { font-size:1.6rem; font-weight:700; margin-bottom:8px; }
.payment-header p { color:var(--text-muted); font-size:0.95rem; }
.payment-details { background:var(--bg-elevated); border-radius:var(--radius-sm); padding:24px; margin-bottom:28px; border:1px solid var(--border); }
.detail-row { display:flex; justify-content:space-between; align-items:center; padding:12px 0; border-bottom:1px solid var(--border); }
.detail-row:last-child { border-bottom:none; }
.detail-row.highlight { background:var(--primary-glow); margin:0 -12px; padding:16px 12px; border-radius:var(--radius-xs); border:1px solid rgba(245,158,11,0.2); }
.detail-label { color:var(--text-dim); font-size:0.9rem; }
.detail-value { font-weight:600; color:var(--text); }
.detail-value.amount { font-size:1.3rem; color:var(--primary); }
.currency-badge { background:var(--primary-glow); color:var(--primary); padding:4px 12px; border-radius:100px; font-size:0.85rem; text-transform:uppercase; }
.qr-section { text-align:center; margin-bottom:28px; }
.qr-box { display:inline-block; padding:24px; background:white; border-radius:var(--radius-sm); }
.qr-code { width:200px; height:200px; }
.qr-label { margin-top:12px; color:var(--text-dim); font-size:0.85rem; }
.address-section { margin-bottom:28px; }
.address-label { display:block; color:var(--text-muted); font-size:0.9rem; margin-bottom:10px; }
.address-box { display:flex; align-items:center; gap:12px; background:var(--bg-elevated); border:1px solid var(--border); border-radius:var(--radius-xs); padding:14px 18px; }
.address-code { flex:1; font-family:'SF Mono','Consolas',monospace; font-size:0.85rem; color:var(--text); word-break:break-all; }
.copy-btn { white-space:nowrap; }
.payment-status-box { display:flex; align-items:center; gap:12px; padding:16px 20px; border-radius:var(--radius-xs); margin-bottom:24px; background:rgba(245,158,11,0.1); border:1px solid rgba(245,158,11,0.2); }
.payment-status-box.confirmed { background:rgba(34,197,94,0.1); border-color:rgba(34,197,94,0.2); }
.status-indicator { width:10px; height:10px; border-radius:50%; animation:pulse 1.5s infinite; }
.status-indicator.pending { background:var(--primary); }
.status-indicator.confirmed { background:var(--success); animation:none; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }
.payment-actions { display:flex; gap:12px; }
.payment-actions .btn { flex:1; }
.payment-note { margin-top:28px; padding-top:20px; border-top:1px solid var(--border); text-align:center; }
.payment-note p { color:var(--text-dim); font-size:0.85rem; margin-bottom:6px; }
.payment-note a { color:var(--primary); text-decoration:none; }
.payment-note code { background:var(--bg-elevated); padding:3px 8px; border-radius:4px; font-size:0.8rem; }

/* Success/Download */
.success-section,.download-section { padding:100px 0; }
.success-card,.download-card { max-width:560px; margin:0 auto; text-align:center; background:var(--surface); padding:56px; border-radius:var(--radius); border:1px solid var(--border); box-shadow:var(--shadow-lg); }
.success-icon { width:80px; height:80px; background:var(--primary-glow); border-radius:50%; display:flex; align-items:center; justify-content:center; margin:0 auto 24px; font-size:2rem; color:var(--primary); }
.success-card h1 { margin-bottom:16px; font-size:1.8rem; font-weight:700; }
.status-box { display:inline-flex; align-items:center; gap:12px; padding:16px 28px; border-radius:var(--radius-xs); margin:28px 0; font-weight:500; }
.status-box.pending { background:rgba(245,158,11,0.1); color:var(--primary); border:1px solid rgba(245,158,11,0.2); }
.status-box.confirmed { background:rgba(34,197,94,0.1); color:var(--success); border:1px solid rgba(34,197,94,0.2); }
.status-indicator { width:10px; height:10px; border-radius:50%; background:currentColor; animation:pulse 1.5s infinite; }
.success-actions { margin-top:28px; }
.success-note { margin-top:24px; font-size:0.9rem; color:var(--text-dim); }

.download-header { margin-bottom:36px; }
.download-icon { width:64px; height:64px; background:var(--accent-glow); border-radius:50%; display:flex; align-items:center; justify-content:center; margin:0 auto 16px; font-size:1.5rem; color:var(--accent); }
.download-list { text-align:left; margin-bottom:28px; }
.download-item { display:flex; align-items:center; justify-content:space-between; padding:20px; border:1px solid var(--border); border-radius:var(--radius-xs); margin-bottom:12px; background:var(--bg-elevated); transition:all 0.2s; }
.download-item:hover { border-color:var(--border-hover); }
.download-info h3 { font-size:1.05rem; margin-bottom:4px; color:var(--text); }
.download-format { font-size:0.8rem; color:var(--text-dim); background:var(--surface); padding:4px 10px; border-radius:6px; border:1px solid var(--border); }
.download-note { font-size:0.9rem; color:var(--text-dim); }
.download-note code { background:var(--bg-elevated); padding:6px 12px; border-radius:6px; font-size:0.85rem; border:1px solid var(--border); color:var(--primary); }

/* Ebook Detail */
.ebook-detail { padding:80px 0; }
.ebook-layout { display:grid; grid-template-columns:340px 1fr; gap:56px; }
.ebook-cover-large { border-radius:var(--radius); overflow:hidden; border:1px solid var(--border); box-shadow:var(--shadow-lg); }
.ebook-cover-large img { width:100%; display:block; }
.ebook-meta h1 { font-size:2.4rem; font-weight:700; margin-bottom:16px; letter-spacing:-0.02em; }
.ebook-price-tag { font-size:1.8rem; font-weight:700; color:var(--primary); margin-bottom:20px; }
.ebook-description { color:var(--text-muted); margin-bottom:32px; line-height:1.8; font-size:1.05rem; }
.ebook-actions { display:flex; gap:16px; margin-bottom:32px; }
.ebook-trust span { display:inline-flex; align-items:center; gap:8px; margin-right:24px; font-size:0.9rem; color:var(--text-dim); background:var(--bg-elevated); padding:8px 16px; border-radius:100px; border:1px solid var(--border); }

/* Error */
.error-section { padding:140px 0; text-align:center; }
.error-code { font-size:7rem; font-weight:800; color:var(--surface); line-height:1; letter-spacing:-0.05em; }
.error-card h1 { margin:20px 0; font-size:1.8rem; font-weight:700; }
.error-card p { color:var(--text-muted); margin-bottom:32px; }

/* Footer */
.site-footer { background:var(--bg-elevated); border-top:1px solid var(--border); padding:64px 0 32px; margin-top:80px; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr; gap:48px; margin-bottom:48px; }
.footer-brand .logo-icon { margin-bottom:12px; }
.footer-brand p { color:var(--text-dim); margin-top:12px; font-size:0.95rem; line-height:1.6; }
.footer-links h4 { font-size:0.95rem; margin-bottom:16px; color:var(--text); font-weight:600; }
.footer-links a,.footer-links span { display:block; color:var(--text-dim); text-decoration:none; font-size:0.9rem; margin-bottom:10px; transition:color 0.2s; }
.footer-links a:hover { color:var(--primary); }
.footer-bottom { border-top:1px solid var(--border); padding-top:32px; text-align:center; color:var(--text-dim); font-size:0.85rem; }

/* Alerts */
.alert { padding:14px 18px; border-radius:var(--radius-xs); margin-bottom:20px; font-size:0.9rem; font-weight:500; }
.alert-error { background:rgba(239,68,68,0.1); color:#fca5a5; border:1px solid rgba(239,68,68,0.2); }

/* Empty */
.empty-state { text-align:center; padding:80px 20px; color:var(--text-dim); }

/* Responsive */
@media(max-width:1024px){ .cart-layout,.checkout-layout,.ebook-layout{grid-template-columns:1fr} .bundle-promo{flex-direction:column;text-align:center} }
@media(max-width:768px){ .hero-title{font-size:2.4rem} .books-grid{grid-template-columns:repeat(2,1fr)} .trust-grid{grid-template-columns:repeat(2,1fr)} .footer-grid{grid-template-columns:1fr} .hero-cta{flex-direction:column;align-items:center} .main-nav{gap:20px} }
@media(max-width:480px){ .books-grid{grid-template-columns:1fr} .trust-grid{grid-template-columns:1fr} .hero-title{font-size:2rem} .container{padding:0 20px} }