/* ============ RESET & BASE ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg-primary:#0a0e27;
  --bg-secondary:#0f1435;
  --bg-card:#151b3d;
  --bg-elevated:#1a2148;
  --border:#252d5c;
  --border-light:#2d3670;
  --text-primary:#e4e9ff;
  --text-secondary:#a0a8d4;
  --text-muted:#6b7599;
  --accent:#00d4ff;
  --accent-2:#7c3aed;
  --accent-3:#ec4899;
  --gradient-1:linear-gradient(135deg,#00d4ff 0%,#7c3aed 100%);
  --gradient-2:linear-gradient(135deg,#7c3aed 0%,#ec4899 100%);
  --gradient-3:linear-gradient(135deg,#00d4ff 0%,#06b6d4 100%);
  --gradient-bg:linear-gradient(180deg,#0a0e27 0%,#151b3d 100%);
  --success:#10d982;
  --warning:#fbbf24;
  --danger:#ef4444;
  --glow:0 0 40px rgba(0,212,255,.3);
  --shadow-lg:0 20px 60px rgba(0,0,0,.4);
  --shadow-glow:0 0 30px rgba(124,58,237,.4);
}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
  font-family:'Inter','SF Pro Display',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-size:15px;line-height:1.65;
  color:var(--text-primary);
  background:var(--bg-primary);
  background-image:
    radial-gradient(circle at 20% 0%,rgba(124,58,237,.15) 0%,transparent 50%),
    radial-gradient(circle at 80% 100%,rgba(0,212,255,.1) 0%,transparent 50%),
    radial-gradient(circle at 50% 50%,rgba(236,72,153,.05) 0%,transparent 70%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none;transition:all .2s}
a:hover{color:#7cf0ff}
.container{max-width:1240px;margin:0 auto;padding:0 24px}

/* ============ ANIMATED BACKGROUND GRID ============ */
body::before{
  content:'';
  position:fixed;
  top:0;left:0;right:0;bottom:0;
  background-image:
    linear-gradient(rgba(0,212,255,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.03) 1px,transparent 1px);
  background-size:50px 50px;
  pointer-events:none;
  z-index:0;
  mask-image:radial-gradient(ellipse at center,black 40%,transparent 80%);
}
main{position:relative;z-index:1}

/* ============ HEADER ============ */
.site-header{
  background:rgba(10,14,39,.85);
  backdrop-filter:blur(20px);
  -webkit-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;gap:2rem;
}
.logo{
  display:flex;align-items:center;gap:.6rem;
  font-weight:800;font-size:1.3rem;
  color:var(--text-primary);
  letter-spacing:-.02em;
}
.logo:hover{color:var(--accent)}
.logo-icon{
  width:38px;height:38px;
  background:var(--gradient-1);
  border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;
  box-shadow:0 8px 24px rgba(0,212,255,.4);
  position:relative;
}
.logo-icon::after{
  content:'';position:absolute;inset:0;
  border-radius:10px;
  background:var(--gradient-1);
  filter:blur(15px);opacity:.5;z-index:-1;
}
.main-nav{display:flex;gap:.25rem;flex:1;margin-left:1rem}
.main-nav a{
  color:var(--text-secondary);font-weight:500;
  padding:.5rem 1rem;border-radius:8px;
  font-size:.925rem;
  position:relative;
}
.main-nav a:hover{color:var(--text-primary);background:rgba(255,255,255,.04)}
.header-actions{display:flex;align-items:center;gap:.75rem}
.header-search{position:relative}
.header-search input{
  padding:.6rem 1rem .6rem 2.5rem;
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  border-radius:10px;width:240px;
  font-size:.875rem;color:var(--text-primary);
  transition:all .2s;
}
.header-search input:focus{
  outline:none;border-color:var(--accent);
  background:rgba(0,212,255,.05);
  box-shadow:0 0 0 3px rgba(0,212,255,.1);
}
.header-search::before{
  content:'⌕';position:absolute;left:.9rem;top:50%;
  transform:translateY(-50%);color:var(--text-muted);
  font-size:1.1rem;font-weight:700;
}
.header-search input::placeholder{color:var(--text-muted)}
.btn-signin{
  padding:.6rem 1.25rem;
  background:var(--gradient-1);
  color:#fff !important;
  border-radius:10px;
  font-weight:600;font-size:.9rem;
  box-shadow:0 4px 20px rgba(0,212,255,.25);
  transition:all .2s;
}
.btn-signin:hover{transform:translateY(-1px);box-shadow:0 6px 30px rgba(0,212,255,.4)}

/* ============ HERO ============ */
.hero{
  padding:6rem 0 5rem;text-align:center;
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;
  top:-100px;left:50%;transform:translateX(-50%);
  width:800px;height:800px;
  background:radial-gradient(circle,rgba(124,58,237,.25) 0%,transparent 60%);
  z-index:-1;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.4rem 1rem;
  background:rgba(0,212,255,.08);
  border:1px solid rgba(0,212,255,.2);
  border-radius:100px;
  font-size:.8rem;font-weight:600;
  color:var(--accent);
  margin-bottom:1.5rem;
  letter-spacing:.02em;
}
.hero-badge-dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 10px var(--accent);
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%,100%{opacity:1}
  50%{opacity:.4}
}
.hero h1{
  font-size:3.75rem;font-weight:800;
  margin-bottom:1.25rem;
  letter-spacing:-.03em;line-height:1.1;
  background:linear-gradient(180deg,#fff 0%,#a0a8d4 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero h1 .grad{
  background:var(--gradient-1);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-sub{
  font-size:1.2rem;color:var(--text-secondary);
  margin-bottom:2.5rem;max-width:720px;
  margin-left:auto;margin-right:auto;line-height:1.6;
}
.hero-search{
  display:flex;max-width:640px;margin:0 auto 3rem;
  background:rgba(21,27,61,.6);
  backdrop-filter:blur(10px);
  border:1px solid var(--border-light);
  border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow-lg);
  transition:all .3s;
}
.hero-search:focus-within{
  border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(0,212,255,.1),var(--shadow-lg);
}
.hero-search input{
  flex:1;padding:1.1rem 1.5rem;
  border:none;background:transparent;
  font-size:1rem;color:var(--text-primary);outline:none;
}
.hero-search input::placeholder{color:var(--text-muted)}
.hero-search button{
  padding:1.1rem 2rem;
  background:var(--gradient-1);color:#fff;
  border:none;font-weight:600;
  cursor:pointer;font-size:.95rem;
  transition:all .2s;
}
.hero-search button:hover{filter:brightness(1.1)}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:1rem;max-width:860px;margin:0 auto;
}
.hero-stats > div{
  background:rgba(21,27,61,.6);
  backdrop-filter:blur(10px);
  padding:1.25rem 1rem;border-radius:14px;
  border:1px solid var(--border);
  transition:all .3s;
}
.hero-stats > div:hover{
  transform:translateY(-3px);
  border-color:var(--accent);
  box-shadow:0 10px 30px rgba(0,212,255,.15);
}
.hero-stats strong{
  display:block;font-size:1.85rem;font-weight:800;
  background:var(--gradient-1);
  -webkit-background-clip:text;
  background-clip:text;color:transparent;
  margin-bottom:.25rem;
}
.hero-stats span{
  font-size:.8rem;color:var(--text-muted);
  font-weight:500;letter-spacing:.03em;text-transform:uppercase;
}

/* ============ PAGE HEADER ============ */
.page-header{
  padding:4rem 0 3rem;
  position:relative;overflow:hidden;
  border-bottom:1px solid var(--border);
}
.page-header::before{
  content:'';position:absolute;
  top:-200px;right:-100px;
  width:500px;height:500px;
  background:radial-gradient(circle,rgba(124,58,237,.2) 0%,transparent 60%);
  z-index:-1;
}
.page-header h1{
  font-size:2.5rem;font-weight:800;
  margin-bottom:.75rem;letter-spacing:-.02em;
  color:var(--text-primary);
}
.page-header p{color:var(--text-secondary);font-size:1.1rem;margin-bottom:1rem;max-width:700px}
.breadcrumb{
  color:var(--text-muted);margin-bottom:1.25rem;
  font-size:.875rem;font-weight:500;
}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--accent)}
.page-stats{display:flex;gap:2rem;margin-top:1.25rem;flex-wrap:wrap}
.page-stats span{color:var(--text-secondary);font-size:.925rem}
.page-stats strong{color:var(--accent);font-weight:700;margin-right:.35rem}

/* ============ SECTIONS ============ */
.section{padding:4rem 0}
.section-title{
  font-size:2rem;font-weight:800;
  margin-bottom:2.5rem;letter-spacing:-.02em;
  color:var(--text-primary);
  position:relative;padding-left:1rem;
}
.section-title::before{
  content:'';position:absolute;left:0;top:50%;
  transform:translateY(-50%);
  width:4px;height:70%;
  background:var(--gradient-1);
  border-radius:4px;
}

/* ============ CATEGORY GRID ============ */
.category-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1.5rem;
}
.category-card{
  background:var(--bg-card);
  border-radius:16px;padding:1.75rem;
  border:1px solid var(--border);
  transition:all .3s;
  color:var(--text-primary);
  display:block;
  position:relative;overflow:hidden;
}
.category-card::before{
  content:'';position:absolute;
  top:0;left:0;right:0;height:3px;
  background:var(--cat-color,var(--gradient-1));
  opacity:.9;
}
.category-card::after{
  content:'';position:absolute;
  top:-50%;right:-50%;
  width:200px;height:200px;
  background:radial-gradient(circle,var(--cat-color,rgba(0,212,255,.15)) 0%,transparent 70%);
  opacity:.15;
  transition:opacity .3s;
}
.category-card:hover{
  transform:translateY(-6px);
  border-color:var(--border-light);
  box-shadow:0 20px 40px rgba(0,0,0,.3);
}
.category-card:hover::after{opacity:.4}
.cat-icon{
  font-size:2.5rem;margin-bottom:.75rem;
  filter:drop-shadow(0 0 20px rgba(0,212,255,.5));
}
.category-card h3{
  font-size:1.2rem;font-weight:700;
  margin-bottom:.5rem;color:var(--text-primary);
}
.category-card p{color:var(--text-secondary);font-size:.9rem;margin-bottom:1rem;line-height:1.5}
.cat-count{
  color:var(--accent);font-weight:600;font-size:.85rem;
  display:inline-flex;align-items:center;gap:.35rem;
}
.cat-count::after{content:'→';transition:transform .2s}
.category-card:hover .cat-count::after{transform:translateX(4px)}

/* ============ QUESTION LIST ============ */
.question-list{display:flex;flex-direction:column;gap:1rem}
.q-item{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:12px;padding:1.5rem;
  display:flex;gap:1.75rem;
  transition:all .3s;position:relative;overflow:hidden;
}
.q-item::before{
  content:'';position:absolute;
  left:0;top:0;bottom:0;width:3px;
  background:var(--gradient-1);
  opacity:0;transition:opacity .3s;
}
.q-item:hover{
  border-color:var(--border-light);
  transform:translateX(4px);
  box-shadow:0 10px 30px rgba(0,0,0,.2);
}
.q-item:hover::before{opacity:1}
.q-stats{
  display:flex;flex-direction:column;gap:.6rem;
  min-width:78px;text-align:center;
}
.q-stats > div{
  padding:.5rem;border-radius:8px;
  background:rgba(255,255,255,.03);
  border:1px solid var(--border);
}
.q-stats .answered{
  background:rgba(16,217,130,.1);
  border-color:rgba(16,217,130,.3);
  color:var(--success);
}
.q-stats strong{
  display:block;font-size:1.05rem;font-weight:700;
  color:var(--text-primary);
}
.q-stats .answered strong{color:var(--success)}
.q-stats span{
  font-size:.7rem;color:var(--text-muted);
  font-weight:500;text-transform:uppercase;letter-spacing:.05em;
}
.q-body{flex:1;min-width:0}
.q-body h3{
  font-size:1.15rem;font-weight:600;
  margin-bottom:.75rem;line-height:1.4;
}
.q-body h3 a{color:var(--text-primary)}
.q-body h3 a:hover{color:var(--accent)}
.q-tags{
  display:flex;flex-wrap:wrap;gap:.4rem;
  margin-bottom:.75rem;
}
.tag{
  background:rgba(124,58,237,.15);
  color:#c4b5fd;
  padding:.25rem .7rem;border-radius:6px;
  font-size:.75rem;font-weight:500;
  border:1px solid rgba(124,58,237,.3);
  transition:all .2s;
  display:inline-block;
}
.tag:hover{
  background:rgba(124,58,237,.25);
  color:#e0d5ff;
  border-color:rgba(124,58,237,.5);
}
.q-meta{
  font-size:.85rem;color:var(--text-muted);
  display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;
}
.cat-badge{
  display:inline-block;padding:.2rem .7rem;
  border-radius:6px;color:#fff;
  font-size:.7rem;font-weight:700;
  text-transform:uppercase;letter-spacing:.04em;
}

/* ============ SORT BAR ============ */
.sort-bar{
  display:flex;gap:.5rem;margin-bottom:1.75rem;
  padding:.5rem;background:var(--bg-card);
  border-radius:10px;border:1px solid var(--border);
  width:fit-content;
}
.sort-bar a{
  padding:.55rem 1.2rem;color:var(--text-secondary);
  border-radius:7px;font-weight:500;font-size:.9rem;
  transition:all .2s;
}
.sort-bar a.active{
  background:var(--gradient-1);color:#fff;
  box-shadow:0 4px 15px rgba(0,212,255,.3);
}
.sort-bar a:hover:not(.active){
  background:rgba(255,255,255,.04);color:var(--text-primary);
}

/* ============ QUESTION DETAIL ============ */
.q-detail{padding:2.5rem 0}
.q-detail .container{
  display:grid;grid-template-columns:1fr 340px;gap:2rem;
}
.q-detail-main{
  background:var(--bg-card);
  border-radius:16px;padding:2.5rem;
  border:1px solid var(--border);
}
.q-header h1{
  font-size:2rem;font-weight:800;
  margin-bottom:1rem;line-height:1.25;
  letter-spacing:-.01em;
  color:var(--text-primary);
}
.q-header-meta{
  display:flex;gap:1.5rem;flex-wrap:wrap;
  color:var(--text-muted);font-size:.875rem;
  padding-bottom:1.25rem;border-bottom:1px solid var(--border);
  margin-bottom:1.75rem;
}
.q-header-meta strong{color:var(--text-primary);font-weight:600}
.q-tags-wrap{margin-bottom:2rem;display:flex;flex-wrap:wrap;gap:.5rem}

/* ============ ANSWER BLOCK ============ */
.answer-block{
  display:flex;gap:1.5rem;padding:1.75rem 0;
  border-bottom:1px solid var(--border);
}
.answer-block:last-of-type{border-bottom:none}
.best-answer{
  background:linear-gradient(135deg,rgba(16,217,130,.05) 0%,rgba(0,212,255,.03) 100%);
  padding:1.75rem;border-radius:14px;
  border:1px solid rgba(16,217,130,.25);
  margin-bottom:2rem;position:relative;
}
.best-answer::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--success) 0%,var(--accent) 100%);
  border-radius:14px 14px 0 0;
}
.vote-col{
  display:flex;flex-direction:column;align-items:center;
  gap:.5rem;min-width:52px;
}
.vote-btn{
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  border-radius:50%;width:38px;height:38px;
  font-size:.9rem;cursor:pointer;
  color:var(--text-secondary);
  transition:all .2s;font-weight:700;
}
.vote-btn:hover{
  background:rgba(0,212,255,.1);
  color:var(--accent);
  border-color:var(--accent);
  transform:scale(1.1);
}
.vote-count{
  font-size:1.35rem;font-weight:800;
  color:var(--text-primary);
}
.accepted-mark{
  color:var(--success);font-size:1.75rem;
  font-weight:800;margin-top:.5rem;
  filter:drop-shadow(0 0 8px rgba(16,217,130,.6));
}
.answer-content{flex:1;min-width:0}
.best-badge{
  display:inline-flex;align-items:center;gap:.4rem;
  background:linear-gradient(135deg,var(--success) 0%,#059669 100%);
  color:#fff;padding:.4rem .85rem;
  border-radius:6px;font-size:.75rem;
  font-weight:700;margin-bottom:1.25rem;
  text-transform:uppercase;letter-spacing:.05em;
  box-shadow:0 4px 15px rgba(16,217,130,.3);
}
.answer-body{color:var(--text-secondary);line-height:1.8;font-size:.95rem}
.answer-body h3{
  font-size:1.2rem;font-weight:700;
  margin:1.75rem 0 .85rem;
  color:var(--text-primary);
}
.answer-body ul,.answer-body ol{margin:.85rem 0 1.25rem 1.5rem}
.answer-body li{margin-bottom:.5rem;color:var(--text-secondary)}
.answer-body p{margin-bottom:1rem}
.answer-body strong{color:var(--text-primary);font-weight:600}
.answer-body table{
  width:100%;border-collapse:collapse;margin:1.25rem 0;
  background:rgba(255,255,255,.02);border-radius:10px;overflow:hidden;
}
.answer-body th,.answer-body td{
  padding:.75rem 1rem;text-align:left;font-size:.875rem;
  border-bottom:1px solid var(--border);
}
.answer-body th{
  background:rgba(0,212,255,.08);color:var(--text-primary);
  font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;
}
.answer-body td{color:var(--text-secondary)}
.answer-body tr:last-child td{border-bottom:none}
.answer-body code{
  background:rgba(0,212,255,.1);color:var(--accent);
  padding:.15rem .4rem;border-radius:4px;
  font-family:'JetBrains Mono','Fira Code',monospace;
  font-size:.85em;
}
.answer-body a{color:var(--accent);text-decoration:underline;text-decoration-color:rgba(0,212,255,.4)}
.answer-body a:hover{text-decoration-color:var(--accent)}

.answer-author{
  display:flex;justify-content:space-between;align-items:flex-start;
  margin-top:1.75rem;padding-top:1.25rem;
  border-top:1px solid var(--border);flex-wrap:wrap;gap:1rem;
}
.user-card{display:flex;gap:.85rem;align-items:center}
.user-avatar{
  width:46px;height:46px;border-radius:10px;color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:.9rem;flex-shrink:0;
  box-shadow:0 4px 15px rgba(0,0,0,.2);
}
.user-card > div:last-child strong{color:var(--text-primary);font-size:.95rem}
.user-title{font-size:.85rem;color:var(--text-secondary);margin-top:.15rem}
.user-rep{
  font-size:.8rem;color:var(--accent);font-weight:600;
  margin-top:.15rem;display:flex;align-items:center;gap:.25rem;
}
.user-rep::before{content:'★';font-size:.85rem}
.answer-date{color:var(--text-muted);font-size:.85rem}

.vendor-note{
  margin-top:1.75rem;padding:1.25rem 1.5rem;
  background:linear-gradient(135deg,rgba(251,191,36,.08) 0%,rgba(236,72,153,.05) 100%);
  border-left:3px solid var(--warning);
  border-radius:10px;font-size:.9rem;
  color:var(--text-secondary);
}
.vendor-note strong{color:var(--text-primary)}
.vendor-note a{color:var(--warning);font-weight:600}
.vendor-note a:hover{color:#fcd34d}

.answers-heading{
  font-size:1.4rem;font-weight:700;
  margin:2rem 0 1.25rem;color:var(--text-primary);
}
.your-answer{
  margin-top:2.5rem;padding-top:2rem;
  border-top:2px solid var(--border);
}
.your-answer h3{font-size:1.25rem;margin-bottom:1rem;color:var(--text-primary)}
.your-answer textarea{
  width:100%;padding:1rem 1.25rem;
  background:rgba(255,255,255,.03);
  border:1px solid var(--border);
  border-radius:10px;
  font-family:inherit;font-size:.925rem;
  color:var(--text-primary);
  margin-bottom:1rem;resize:vertical;min-height:120px;
  transition:all .2s;
}
.your-answer textarea:focus{
  outline:none;border-color:var(--accent);
  background:rgba(0,212,255,.03);
  box-shadow:0 0 0 3px rgba(0,212,255,.1);
}
.signin-note{color:var(--text-muted);font-size:.85rem;margin-top:.75rem}

/* ============ SIDEBAR ============ */
.q-sidebar{display:flex;flex-direction:column;gap:1.25rem}
.sidebar-widget{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:14px;padding:1.5rem;
}
.sidebar-widget h4{
  font-size:1rem;font-weight:700;margin-bottom:1rem;
  color:var(--text-primary);
  padding-bottom:.75rem;border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:.5rem;
}
.sidebar-widget h4::before{
  content:'';width:4px;height:14px;
  background:var(--gradient-1);border-radius:2px;
}
.sidebar-widget ul{list-style:none}
.sidebar-widget li{
  padding:.75rem 0;border-bottom:1px solid var(--border);
  font-size:.9rem;
}
.sidebar-widget li:last-child{border:none;padding-bottom:0}
.sidebar-widget li a{color:var(--text-secondary);line-height:1.4;display:block}
.sidebar-widget li a:hover{color:var(--accent)}
.widget-meta{
  display:block;color:var(--text-muted);
  font-size:.75rem;margin-top:.35rem;
}
.tag-cloud{display:flex;flex-wrap:wrap;gap:.4rem}
.tag-cloud .tag span{
  color:var(--accent);font-weight:700;margin-left:.25rem;
}
.widget-cta{
  background:linear-gradient(135deg,rgba(124,58,237,.15) 0%,rgba(0,212,255,.1) 100%);
  border-color:rgba(124,58,237,.4);position:relative;overflow:hidden;
}
.widget-cta::before{
  content:'';position:absolute;top:-50%;right:-50%;
  width:200px;height:200px;
  background:radial-gradient(circle,rgba(124,58,237,.3) 0%,transparent 70%);
}
.widget-cta > *{position:relative;z-index:1}
.widget-cta p{font-size:.9rem;color:var(--text-secondary);margin-bottom:1rem;line-height:1.5}

/* ============ ACTIVITY ============ */
.activity-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
  gap:1rem;
}
.activity-card{
  background:var(--bg-card);
  padding:1.25rem;border-radius:12px;
  border:1px solid var(--border);
  display:flex;gap:.85rem;align-items:flex-start;
  font-size:.9rem;color:var(--text-secondary);
  transition:all .3s;
}
.activity-card:hover{
  border-color:var(--border-light);
  transform:translateY(-3px);
}
.activity-card strong{color:var(--text-primary);font-weight:600}
.activity-card a{
  display:block;margin-top:.35rem;
  color:var(--accent);font-weight:500;line-height:1.4;
}
.activity-meta{color:var(--text-muted);font-size:.8rem;margin-top:.35rem}

/* ============ TOPIC GRID ============ */
.topic-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:1rem;margin:1.5rem 0;
}
.topic-card{
  background:var(--bg-card);
  padding:1.5rem;border-radius:12px;
  border:1px solid var(--border);
}
.topic-card h3{font-size:1.05rem;margin:.5rem 0;color:var(--text-primary)}
.topic-card p{font-size:.85rem;color:var(--text-secondary);line-height:1.5}

/* ============ NOTICE / EMPTY ============ */
.notice-card,.empty-state{
  background:var(--bg-card);
  padding:3.5rem 2rem;border-radius:16px;
  text-align:center;border:1px solid var(--border);
  position:relative;overflow:hidden;
}
.notice-card::before{
  content:'';position:absolute;top:-100px;left:50%;
  transform:translateX(-50%);width:400px;height:400px;
  background:radial-gradient(circle,rgba(124,58,237,.15) 0%,transparent 60%);
}
.notice-card > *{position:relative;z-index:1}
.notice-icon{font-size:4.5rem;margin-bottom:1.25rem;filter:drop-shadow(0 0 20px rgba(0,212,255,.5))}
.notice-card h1,.empty-state h3{
  font-size:1.85rem;margin-bottom:1rem;
  color:var(--text-primary);font-weight:800;
}
.notice-card p,.empty-state p{color:var(--text-secondary);margin-bottom:1rem;line-height:1.6}

/* ============ BUTTONS ============ */
.btn{
  display:inline-block;padding:.75rem 1.5rem;
  border-radius:10px;font-weight:600;cursor:pointer;
  border:none;font-size:.925rem;
  transition:all .2s;text-decoration:none;
  margin:.35rem;
}
.btn-primary{
  background:var(--gradient-1);color:#fff;
  box-shadow:0 4px 20px rgba(0,212,255,.3);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 30px rgba(0,212,255,.5);
  color:#fff;text-decoration:none;
}
.btn-outline{
  background:transparent;color:var(--accent);
  border:2px solid var(--accent);
}
.btn-outline:hover{
  background:var(--accent);color:var(--bg-primary);
  text-decoration:none;
}

/* ============ MODAL ============ */
.modal{
  display:none;position:fixed;top:0;left:0;
  width:100%;height:100%;
  background:rgba(0,0,0,.75);
  backdrop-filter:blur(8px);
  z-index:1000;align-items:center;justify-content:center;
  padding:1rem;
}
.modal-content{
  background:var(--bg-card);
  padding:3rem 2.5rem;border-radius:20px;
  max-width:480px;text-align:center;position:relative;
  border:1px solid var(--border-light);
  box-shadow:var(--shadow-lg);
  animation:modalIn .3s ease-out;
}
@keyframes modalIn{
  from{opacity:0;transform:scale(.9) translateY(20px)}
  to{opacity:1;transform:scale(1) translateY(0)}
}
.modal-close{
  position:absolute;top:1rem;right:1.5rem;
  font-size:1.8rem;cursor:pointer;
  color:var(--text-muted);line-height:1;
  transition:color .2s;
}
.modal-close:hover{color:var(--text-primary)}
.modal-icon{font-size:3.75rem;margin-bottom:1.25rem;filter:drop-shadow(0 0 20px rgba(0,212,255,.5))}
.modal-content h3{
  font-size:1.5rem;margin-bottom:1rem;
  color:var(--text-primary);font-weight:700;
}
.modal-content p{color:var(--text-secondary);margin-bottom:1rem;line-height:1.6}
.modal-note{font-size:.85rem;color:var(--text-muted)}

/* ============ FOOTER ============ */
.site-footer{
  background:var(--bg-secondary);
  border-top:1px solid var(--border);
  padding:4rem 0 1.5rem;margin-top:5rem;
  position:relative;
}
.site-footer::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent 0%,var(--accent) 50%,transparent 100%);
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:2.5rem;margin-bottom:2.5rem;
}
.footer-grid h4{
  color:var(--text-primary);font-size:1rem;
  margin-bottom:1.25rem;font-weight:700;
}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:.6rem}
.footer-grid a{
  color:var(--text-secondary);font-size:.9rem;
  transition:color .2s;
}
.footer-grid a:hover{color:var(--accent)}
.footer-grid p{color:var(--text-secondary);font-size:.9rem;line-height:1.6;margin-bottom:1rem}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:1.5rem;
  text-align:center;color:var(--text-muted);font-size:.85rem;
}

/* ============ RESPONSIVE ============ */
@media (max-width:960px){
  .q-detail .container{grid-template-columns:1fr}
  .hero h1{font-size:2.5rem}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .main-nav{display:none}
  .header-search{display:none}
  .q-item{flex-direction:column;gap:1rem}
  .q-stats{flex-direction:row;justify-content:flex-start}
  .q-stats > div{min-width:70px}
  .answer-block{flex-direction:column;gap:1.25rem}
  .vote-col{flex-direction:row;justify-content:flex-start}
  .answer-author{flex-direction:column;align-items:flex-start}
  .section-title{font-size:1.65rem}
}
@media (max-width:600px){
  .hero{padding:3rem 0 2.5rem}
  .hero h1{font-size:2rem}
  .hero-sub{font-size:1rem}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:.75rem}
  .hero-stats strong{font-size:1.4rem}
  .section{padding:2.5rem 0}
  .q-detail-main{padding:1.5rem}
  .q-header h1{font-size:1.5rem}
  .container{padding:0 16px}
  .header-inner{height:60px}
  .logo-text{font-size:1.05rem}
  .page-header{padding:2.5rem 0 2rem}
  .page-header h1{font-size:1.75rem}
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-primary)}
::-webkit-scrollbar-thumb{
  background:var(--border-light);
  border-radius:5px;
}
::-webkit-scrollbar-thumb:hover{background:var(--accent)}

/* ============ SELECTION ============ */
::selection{background:rgba(0,212,255,.3);color:#fff}