*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d0d0d;
  --bg2:#141414;
  --bg3:#1a1a1a;
  --bg4:#222;
  --border:#2a2a2a;
  --border-hover:#3a3a3a;
  --text:#e4e4e7;
  --text2:#a1a1aa;
  --text3:#71717a;
  --primary:#ccf381;
  --primary-hover:#b8e665;
  --primary-dim:rgba(204,243,129,0.1);
  --radius:12px;
  --radius-sm:8px;
  --radius-full:999px;
  --sidebar-w:260px;
  --header-h:60px;
  --font:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --shadow:0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg:0 8px 30px rgba(0,0,0,0.5);
  --transition:0.2s ease;
}
html,body{height:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  font-size:15px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font:inherit;background:none;border:none;color:inherit}

.app-layout{display:flex;flex-direction:column;height:100vh;overflow:hidden}

/* Header */
.app-header{
  height:var(--header-h);
  border-bottom:1px solid var(--border);
  background:var(--bg2);
  flex-shrink:0;
  z-index:100;
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;padding:0 20px;max-width:1600px;margin:0 auto;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px}
.logo-icon{
  display:flex;align-items:center;justify-content:center;
  width:32px;height:32px;background:var(--primary);color:#000;
  border-radius:var(--radius-sm);font-size:13px;font-weight:800;
}
.header-actions{display:flex;align-items:center;gap:16px}
.search-wrap{
  position:relative;display:flex;align-items:center;
}
.search-icon{position:absolute;left:12px;color:var(--text3);pointer-events:none}
.search-input{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius-full);padding:8px 14px 8px 36px;
  color:var(--text);font-size:14px;width:220px;outline:none;
  transition:var(--transition);
}
.search-input:focus{border-color:var(--primary);width:280px}
.search-input::placeholder{color:var(--text3)}
.counter-badge{font-size:13px;color:var(--text3);white-space:nowrap}
.btn-back{
  display:flex;align-items:center;gap:6px;font-size:14px;color:var(--text2);
  padding:8px 14px;border-radius:var(--radius-full);border:1px solid var(--border);
  transition:var(--transition);
}
.btn-back:hover{color:var(--text);border-color:var(--border-hover);background:var(--bg3)}

/* Body */
.app-body{display:flex;flex:1;overflow:hidden}

/* Sidebar */
.sidebar{
  width:var(--sidebar-w);flex-shrink:0;border-right:1px solid var(--border);
  background:var(--bg2);overflow-y:auto;transition:transform 0.3s ease;
}
.sidebar::-webkit-scrollbar{width:4px}
.sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.sidebar-inner{padding:16px}
.sidebar-section{margin-bottom:8px}
.filter-all{
  display:block;width:100%;text-align:left;padding:10px 14px;
  border-radius:var(--radius-sm);font-size:14px;font-weight:600;color:var(--text2);
  transition:var(--transition);
}
.filter-all:hover{background:var(--bg3);color:var(--text)}
.filter-all.active{background:var(--primary-dim);color:var(--primary)}
.sidebar-divider{height:1px;background:var(--border);margin:12px 0}

.category-group{margin-bottom:6px}
.category-group-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:8px 14px;border-radius:var(--radius-sm);font-size:13px;
  font-weight:600;color:var(--text3);text-transform:uppercase;letter-spacing:0.05em;
  transition:var(--transition);cursor:pointer;width:100%;text-align:left;
}
.category-group-header:hover{color:var(--text2)}
.category-group-header .arrow{transition:transform 0.2s;font-size:10px}
.category-group-header.collapsed .arrow{transform:rotate(-90deg)}
.category-items{padding-left:8px;overflow:hidden;max-height:1000px;transition:max-height 0.3s ease}
.category-items.collapsed{max-height:0}
.category-item{
  display:block;width:100%;text-align:left;padding:7px 14px;
  border-radius:var(--radius-sm);font-size:14px;color:var(--text2);
  transition:var(--transition);position:relative;
}
.category-item:hover{background:var(--bg3);color:var(--text)}
.category-item.active{background:var(--primary-dim);color:var(--primary);font-weight:500}
.category-item .count{
  position:absolute;right:10px;top:50%;transform:translateY(-50%);
  font-size:11px;color:var(--text3);background:var(--bg4);
  padding:1px 7px;border-radius:var(--radius-full);
}

/* Main Content */
.main-content{flex:1;overflow-y:auto;padding:28px 32px}
.main-content::-webkit-scrollbar{width:6px}
.main-content::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.gallery-header{margin-bottom:24px}
.gallery-title{font-size:24px;font-weight:700}
.gallery-desc{color:var(--text2);margin-top:4px;font-size:14px}

/* Grid */
.gallery-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:20px;
}
.card{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  transition:transform 0.25s ease,box-shadow 0.25s ease,border-color 0.25s ease;
  cursor:pointer;display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--border-hover)}
.card-thumb{
  width:100%;aspect-ratio:16/10;object-fit:cover;display:block;
  background:var(--bg4);
}
.card-thumb-placeholder{
  width:100%;aspect-ratio:16/10;display:flex;
  align-items:center;justify-content:center;
  background:var(--bg4);color:var(--text3);font-size:13px;
}
.card-body{padding:14px 16px 16px;flex:1;display:flex;flex-direction:column}
.card-title{font-size:15px;font-weight:600;margin-bottom:4px}
.card-category{font-size:12px;color:var(--text3);margin-top:auto}
.card-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.card-tag{
  font-size:11px;padding:2px 8px;border-radius:var(--radius-full);
  background:var(--bg4);color:var(--text3);
}
.card.hidden{display:none}
.card.empty-state{
  grid-column:1/-1;text-align:center;padding:60px 20px;
  color:var(--text3);background:none;border:none;cursor:default;
}
.card.empty-state:hover{transform:none;box-shadow:none;border-color:transparent}
.card.empty-state h3{font-size:18px;margin-bottom:8px;color:var(--text2)}

/* Detail Page */
.detail-page .app-body{overflow:visible}
.detail-main{
  flex:1;overflow-y:auto;padding:32px;max-width:1200px;margin:0 auto;width:100%;
}
.detail-main::-webkit-scrollbar{width:6px}
.detail-main::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.detail-header{margin-bottom:24px}
.detail-breadcrumb{font-size:13px;color:var(--text3);margin-bottom:8px}
.detail-title{font-size:28px;font-weight:700}
.detail-desc{color:var(--text2);margin-top:6px;font-size:15px}
.detail-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.detail-tag{
  font-size:12px;padding:4px 12px;border-radius:var(--radius-full);
  background:var(--bg4);color:var(--text2);
}
.detail-actions{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 22px;border-radius:var(--radius-full);font-size:14px;font-weight:500;
  transition:var(--transition);border:1px solid transparent;
}
.btn-primary{background:var(--primary);color:#000;font-weight:600}
.btn-primary:hover{background:var(--primary-hover);box-shadow:0 0 20px rgba(204,243,129,0.3)}
.btn-secondary{background:var(--bg3);color:var(--text);border-color:var(--border)}
.btn-secondary:hover{background:var(--bg4);border-color:var(--border-hover)}

.detail-preview{margin-bottom:28px}
.preview-toolbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius) var(--radius) 0 0;border-bottom:none;
}
.preview-label{font-size:13px;font-weight:600;color:var(--text2)}
.preview-controls{display:flex;gap:4px}
.ctrl-btn{
  padding:6px 10px;border-radius:var(--radius-sm);color:var(--text3);
  transition:var(--transition);display:flex;align-items:center;
}
.ctrl-btn:hover{background:var(--bg4);color:var(--text2)}
.ctrl-btn.active{background:var(--bg4);color:var(--primary)}
.preview-frame-wrap{
  border:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius);
  overflow:hidden;background:#fff;position:relative;
}
.preview-frame{
  display:block;width:100%;height:500px;border:none;transition:all 0.3s ease;
}
.preview-frame-wrap.tablet .preview-frame{max-width:768px;margin:0 auto}
.preview-frame-wrap.mobile .preview-frame{max-width:375px;margin:0 auto}

.detail-code{margin-bottom:32px}
.code-toolbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius) var(--radius) 0 0;border-bottom:none;
}
.code-label{font-size:13px;font-weight:600;color:var(--text2)}
.btn-copy-sm{padding:5px 14px;font-size:12px;border-radius:var(--radius-sm);background:var(--bg3);color:var(--text2);border:1px solid var(--border);transition:var(--transition)}
.btn-copy-sm:hover{background:var(--bg4);color:var(--text);border-color:var(--border-hover)}
.btn-copy-sm.copied{background:var(--primary-dim);color:var(--primary);border-color:var(--primary)}
.code-block{
  background:#111;border:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius);
  padding:20px;overflow-x:auto;max-height:400px;overflow-y:auto;
  font-size:13px;line-height:1.6;
}
.code-block code{color:var(--text2);white-space:pre}
.code-block::-webkit-scrollbar{height:6px;width:6px}
.code-block::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}

/* Center page (404) */
.center-page{display:flex;align-items:center;justify-content:center;height:100vh}
.center-content{text-align:center}
.center-content h1{font-size:72px;font-weight:800;color:var(--text3)}
.center-content p{margin:12px 0 24px;color:var(--text2)}

/* Overlay & sidebar toggle */
.sidebar-toggle{
  display:none;position:fixed;bottom:20px;right:20px;z-index:200;
  width:48px;height:48px;border-radius:50%;background:var(--primary);color:#000;
  align-items:center;justify-content:center;box-shadow:var(--shadow-lg);
}
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:50}

/* Responsive */
@media(max-width:900px){
  .sidebar{position:fixed;left:0;top:var(--header-h);bottom:0;z-index:100;transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-toggle{display:flex}
  .overlay.show{display:block}
  .gallery-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .main-content{padding:20px 16px}
  .detail-main{padding:20px 16px}
}
@media(max-width:600px){
  .gallery-grid{grid-template-columns:1fr}
  .search-input{width:160px}
  .search-input:focus{width:200px}
  .header-inner{padding:0 12px}
}