:root{--bg:#0f1117;--card:#1a1d28;--border:#2a2d3a;--text:#e1e4ed;--text2:#8b90a5;--accent:#3b82f6;--accent2:#60a5fa;--tag-bg:#1e2a3a;--tag-text:#60a5fa;--news:#f59e0b;--tutorial:#10b981;--analysis:#8b5cf6;--industry:#ec4899;--danger:#ef4444;--radius:10px;--shadow:0 2px 12px rgba(0,0,0,.3)}
*,::before,::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh}
a{color:var(--accent2);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;backdrop-filter:blur(12px)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-size:1.4rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px}
.logo span{color:var(--accent2)}
.nav{display:flex;gap:4px;align-items:center}
.nav a{padding:8px 16px;border-radius:8px;color:var(--text2);font-size:.9rem;font-weight:500;transition:.2s}
.nav a:hover,.nav a.active{background:rgba(59,130,246,.15);color:var(--accent2)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer;padding:4px 8px}

/* Search */
.search-wrap{position:relative;margin-left:8px}
.search-inp{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:7px 14px 7px 36px;border-radius:20px;font-size:.85rem;width:180px;transition:border-color .2s,width .3s}
.search-inp:focus{outline:none;border-color:var(--accent2);width:240px}
.search-inp::placeholder{color:var(--text2)}
.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text2);font-size:.9rem;pointer-events:none}
.search-drop{display:none;position:absolute;top:44px;right:0;width:320px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 30px rgba(0,0,0,.5);z-index:200;max-height:360px;overflow-y:auto}
.search-drop.active{display:block}
.search-drop .sr-item{display:block;padding:12px 16px;border-bottom:1px solid var(--border);transition:background .15s}
.search-drop .sr-item:hover{background:rgba(59,130,246,.1)}
.search-drop .sr-item:last-child{border-bottom:none}
.sr-title{font-size:.9rem;font-weight:600;color:var(--text);margin-bottom:3px}
.sr-meta{font-size:.75rem;color:var(--text2)}
.sr-empty{padding:20px;text-align:center;color:var(--text2);font-size:.85rem}
@media(max-width:768px){.search-wrap{display:none}}

@media(max-width:768px){
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--card);flex-direction:column;padding:12px;border-bottom:1px solid var(--border)}
  .nav.open{display:flex}
  .nav a{padding:12px 16px}
  .menu-toggle{display:block}
}

/* Page layout */
.page-layout{display:grid;grid-template-columns:1fr 320px;gap:28px;padding:28px 0;align-items:start}
@media(max-width:900px){.page-layout{grid-template-columns:1fr}}

/* Article card (waterfall feed item) */
.article-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 26px;margin-bottom:18px;transition:border-color .2s,box-shadow .2s}
.article-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.card-meta{display:flex;align-items:center;gap:12px;margin-bottom:10px;flex-wrap:wrap}
.card-cat{display:inline-block;padding:2px 10px;border-radius:20px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.card-cat.news{background:rgba(245,158,11,.15);color:var(--news)}
.card-cat.tutorial{background:rgba(16,185,129,.15);color:var(--tutorial)}
.card-cat.analysis{background:rgba(139,92,246,.15);color:var(--analysis)}
.card-cat.industry{background:rgba(236,72,153,.15);color:var(--industry)}
.card-date{color:var(--text2);font-size:.82rem}
.card-title{font-size:1.2rem;font-weight:700;margin-bottom:8px;line-height:1.5}
.card-title a{color:var(--text)}
.card-title a:hover{color:var(--accent2)}
.card-excerpt{color:var(--text2);font-size:.9rem;line-height:1.65;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-tags{display:flex;gap:8px;flex-wrap:wrap}
.card-tag{background:var(--tag-bg);color:var(--tag-text);padding:2px 10px;border-radius:6px;font-size:.78rem}

/* Sidebar */
.sidebar .side-block{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:20px}
.side-block h3{font-size:1rem;margin-bottom:14px;color:var(--text);display:flex;align-items:center;gap:8px}
.side-block h3::before{content:"";width:4px;height:16px;background:var(--accent);border-radius:2px}
.hot-item{display:flex;align-items:flex-start;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}
.hot-item:last-child{border-bottom:none}
.hot-rank{font-size:1.2rem;font-weight:800;color:var(--accent2);min-width:28px;text-align:center}
.hot-rank.top1{color:var(--news)}
.hot-info .hot-title{font-size:.9rem;font-weight:600;margin-bottom:2px}
.hot-info .hot-title a{color:var(--text)}
.hot-info .hot-date{font-size:.75rem;color:var(--text2)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{background:var(--tag-bg);color:var(--tag-text);padding:4px 12px;border-radius:16px;font-size:.8rem;transition:.2s}
.tag-cloud a:hover{background:var(--accent);color:#fff}
.rss-cta{display:block;text-align:center;background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;padding:12px;border-radius:var(--radius);font-weight:600;font-size:.9rem;margin-top:12px;transition:opacity .2s}
.rss-cta:hover{opacity:.9;color:#fff}

/* Pagination */
.pagination{display:flex;justify-content:center;align-items:center;gap:6px;margin:28px 0;flex-wrap:wrap}
.pagination a,.pagination span{padding:8px 14px;border-radius:8px;font-size:.9rem;font-weight:500;transition:.2s;display:inline-block}
.pagination a{background:var(--card);border:1px solid var(--border);color:var(--text2)}
.pagination a:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.pagination .page-active{background:var(--accent);color:#fff;border-color:var(--accent)}
.pagination .page-dots{color:var(--text2);padding:8px 4px}
.pagination .page-prev,.pagination .page-next{font-weight:600}
.pagination .page-disabled{opacity:.3;pointer-events:none}
.page-info{text-align:center;color:var(--text2);font-size:.82rem;margin-bottom:12px}

/* Footer */
.footer{background:var(--card);border-top:1px solid var(--border);padding:30px 0;margin-top:40px;color:var(--text2);font-size:.85rem}
.footer .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px}
.footer a{color:var(--text2)}
.footer a:hover{color:var(--accent2)}
.footer-links{display:flex;gap:16px}

/* Article detail page */
.article-full{padding:28px 0}
.article-full h1{font-size:2rem;line-height:1.4;margin-bottom:16px}
.article-full .article-meta{margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--border)}
.article-full .article-body{font-size:1.05rem;line-height:1.85;word-wrap:break-word}
.article-full .article-body h2{font-size:1.4rem;margin:28px 0 14px;padding-bottom:6px;border-bottom:2px solid var(--border)}
.article-full .article-body h3{font-size:1.15rem;margin:22px 0 10px}
.article-full .article-body p{margin-bottom:16px}
.article-full .article-body ul,.article-full .article-body ol{margin:12px 0 18px 24px}
.article-full .article-body li{margin-bottom:8px}
.article-full .article-body blockquote{background:var(--tag-bg);border-left:4px solid var(--accent);padding:14px 18px;margin:18px 0;border-radius:0 var(--radius) var(--radius) 0;font-style:italic}
.article-full .article-body code{background:var(--tag-bg);padding:2px 8px;border-radius:4px;font-size:.9em}
.article-full .article-body pre{background:#000;padding:16px;border-radius:var(--radius);overflow-x:auto;margin:16px 0}
.article-full .article-body .highlight-box{background:rgba(59,130,246,.08);border:1px solid rgba(59,130,246,.25);border-radius:var(--radius);padding:16px 20px;margin:18px 0}
.article-full .article-body .highlight-box strong{color:var(--accent2)}
.breadcrumb{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:.85rem;color:var(--text2);margin-bottom:20px}
.breadcrumb a{color:var(--text2)}
.breadcrumb span{color:var(--text2)}

/* Category page */
.category-header{margin-bottom:24px}
.category-header h1{font-size:1.6rem;display:flex;align-items:center;gap:10px}
.cat-count{background:var(--tag-bg);color:var(--tag-text);font-size:.85rem;padding:2px 12px;border-radius:20px;font-weight:400}

/* 404 */
.error-page{text-align:center;padding:80px 20px}
.error-page h2{font-size:4rem;color:var(--accent);margin-bottom:16px}
.error-page p{color:var(--text2);margin-bottom:24px}
.error-page a{display:inline-block;background:var(--accent);color:#fff;padding:12px 32px;border-radius:8px;font-weight:600}

/* Bookmark/Save */
.bookmark-btn{display:inline-flex;align-items:center;gap:6px;background:var(--card);border:1px solid var(--border);color:var(--text2);padding:8px 18px;border-radius:8px;font-size:.9rem;cursor:pointer;transition:.2s;margin-top:12px}
.bookmark-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.bookmark-btn.saved{background:rgba(245,158,11,.15);border-color:var(--news);color:var(--news)}
.bookmark-btn.saved:hover{background:var(--news);color:#fff}
.bookmark-star{font-size:1.1rem;transition:transform .3s}
.bookmark-btn.saved .bookmark-star{transform:scale(1.3)}
.bookmark-count{font-size:.78rem;opacity:.7}
/* Saved articles sidebar */
.saved-item{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border)}
.saved-item:last-child{border-bottom:none}
.saved-item a{font-size:.85rem;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-right:8px}
.saved-remove{background:none;border:none;color:var(--text2);cursor:pointer;font-size:1rem;padding:0 4px;transition:color .2s}
.saved-remove:hover{color:var(--danger)}
.saved-empty{padding:12px 0;text-align:center;color:var(--text2);font-size:.82rem}
/* Toast notification */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;padding:12px 28px;border-radius:8px;font-size:.9rem;z-index:999;box-shadow:0 4px 20px rgba(0,0,0,.4);animation:toastIn .3s ease,toastOut .3s ease 2s forwards;pointer-events:none}
@keyframes toastIn{from{opacity:0;transform:translateX(-50%) translateY(20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
@keyframes toastOut{from{opacity:1}to{opacity:0;transform:translateX(-50%) translateY(-20px)}}

/* Scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text2)}

/* ---- Floating Exchange Sidebar ---- */
.floating-ex-sidebar{position:fixed;right:6px;top:50%;transform:translateY(-50%);z-index:9999;display:flex;flex-direction:column;gap:8px}
.floating-ex-sidebar a{display:flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:14px;font-size:.78rem;font-weight:800;color:#fff;text-decoration:none;transition:transform .2s,box-shadow .2s,width .2s;box-shadow:0 4px 18px rgba(0,0,0,.4);position:relative;overflow:hidden;animation:floatingPulse 3s ease-in-out infinite}
.floating-ex-sidebar a:nth-child(1){animation-delay:0s}
.floating-ex-sidebar a:nth-child(2){animation-delay:.4s}
.floating-ex-sidebar a:nth-child(3){animation-delay:.8s}
.floating-ex-sidebar a:hover{transform:scale(1.15);width:64px;box-shadow:0 8px 28px rgba(0,0,0,.55)}
.floating-ex-sidebar a:hover .ex-label{opacity:1;right:72px}
.floating-ex-sidebar a .ex-label{position:absolute;right:60px;background:var(--card);color:var(--text);padding:8px 16px;border-radius:8px;font-size:.82rem;font-weight:600;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .25s,right .2s;border:1px solid var(--border);box-shadow:0 4px 16px rgba(0,0,0,.4)}
@keyframes floatingPulse{0%,100%{box-shadow:0 4px 18px rgba(0,0,0,.4)}50%{box-shadow:0 4px 24px rgba(240,185,11,.25)}}
.floating-ex-sidebar a:nth-child(2){animation-name:floatingPulse2}
@keyframes floatingPulse2{0%,100%{box-shadow:0 4px 18px rgba(0,0,0,.4)}50%{box-shadow:0 4px 24px rgba(0,166,240,.25)}}
.floating-ex-sidebar a:nth-child(3){animation-name:floatingPulse3}
@keyframes floatingPulse3{0%,100%{box-shadow:0 4px 18px rgba(0,0,0,.4)}50%{box-shadow:0 4px 24px rgba(23,230,161,.25)}}
.ex-binance{background:linear-gradient(135deg,#f0b90b,#d4a30a);border:2px solid rgba(240,185,11,.4)}
.ex-okx{background:linear-gradient(135deg,#00a6f0,#0078d4);border:2px solid rgba(0,166,240,.4)}
.ex-gate{background:linear-gradient(135deg,#17e6a1,#0bb884);border:2px solid rgba(23,230,161,.4)}
/* mobile: horizontal bottom bar */
@media(max-width:768px){
  .floating-ex-sidebar{position:fixed;right:0;left:0;bottom:0;top:auto;transform:none;flex-direction:row;gap:0;z-index:9999;background:rgba(15,17,23,.95);backdrop-filter:blur(12px);border-top:2px solid var(--border);padding:8px 4px;justify-content:space-evenly}
  .floating-ex-sidebar a{flex:1;max-width:120px;width:auto;height:44px;border-radius:10px;font-size:.8rem;font-weight:800;letter-spacing:.5px;animation:none;border-width:2px}
  .floating-ex-sidebar a:hover{transform:scale(1.03);width:auto}
  .floating-ex-sidebar a .ex-label{display:none}
}