@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Figtree:wght@300;400;500;600;700&display=swap');

/* ── COURSE THEME DESIGN TOKENS ── */
:root {
  /* Core dark palette */
  --bg:          #0b0f1a;
  --bg-2:        #0f1422;
  --bg-card:     #131929;
  --bg-card-2:   #1a2235;
  --bg-raised:   #1e2a40;
  --border:      rgba(255,255,255,0.07);
  --border-med:  rgba(255,255,255,0.12);
  --border-accent: rgba(99,179,255,0.25);

  /* Blues */
  --blue-bright: #63b3ff;
  --blue-mid:    #3b82f6;
  --blue-deep:   #1d4ed8;
  --blue-glow:   rgba(99,179,255,0.15);
  --blue-subtle: rgba(99,179,255,0.08);

  /* Text */
  --text-primary:   #f0f4ff;
  --text-secondary: #8fa3c8;
  --text-muted:     #4a5a78;
  --text-accent:    var(--blue-bright);

  /* Accents */
  --cyan:  #22d3ee;
  --green: #34d399;
  --amber: #fbbf24;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.7);
  --glow-blue: 0 0 40px rgba(99,179,255,0.12);

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Figtree', system-ui, sans-serif;

  /* Layout */
  --page-pad: clamp(20px,5vw,72px);
  --max-w:    1200px;
  --r-sm:     8px;
  --r:        14px;
  --r-lg:     20px;
  --r-xl:     28px;
  --ease:     cubic-bezier(.25,.46,.45,.94);
  --spring:   cubic-bezier(.34,1.56,.64,1);
}

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-body);background:var(--bg);color:var(--text-primary);line-height:1.6;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:var(--font-body);cursor:pointer;border:none;outline:none}
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 var(--page-pad)}

/* ── ANIMATIONS ── */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes pulse-dot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.65)}}
@keyframes shimmer{0%{background-position:-200% center}100%{background-position:200% center}}
@keyframes spin-slow{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}

.reveal{opacity:0;transform:translateY(28px);transition:opacity .65s var(--ease),transform .65s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.12s}
.reveal-delay-2{transition-delay:.24s}
.reveal-delay-3{transition-delay:.36s}

/* ═══════════════════════════════════════════
   NAV
═══════════════════════════════════════════ */
.nav{
  position:sticky;top:0;z-index:200;height:66px;
  display:flex;align-items:center;
  background:rgba(11,15,26,.9);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);
  transition:background .3s,box-shadow .3s;
}
.nav.scrolled{background:rgba(11,15,26,.97);box-shadow:0 1px 20px rgba(0,0,0,.6)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--max-w);margin:0 auto;padding:0 var(--page-pad)}
.nav-logo{display:flex;align-items:center;gap:11px;font-family:var(--font-display);font-size:1.2rem;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}
.nav-logo-icon{
  width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,var(--blue-deep),var(--blue-mid));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:1.1rem;
  box-shadow:0 2px 12px rgba(59,130,246,.45);
}
.nav-logo span{color:var(--blue-bright)}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none}
.nav-links a{
  padding:7px 14px;border-radius:8px;
  font-size:.875rem;font-weight:500;color:var(--text-secondary);
  transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--text-primary);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--blue-bright);background:var(--blue-subtle)}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--blue-mid);color:#fff !important;
  padding:9px 20px;border-radius:100px;
  font-size:.875rem;font-weight:600 !important;
  transition:background .2s,transform .15s,box-shadow .2s !important;
  box-shadow:0 2px 14px rgba(59,130,246,.4);
}
.nav-cta:hover{background:var(--blue-bright) !important;color:var(--bg) !important;transform:translateY(-1px);box-shadow:0 6px 22px rgba(99,179,255,.5) !important}
.nav-hamburger{display:none;flex-direction:column;gap:5px;background:none;padding:4px}
.nav-hamburger span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:all .3s}

/* ═══════════════════════════════════════════
   HERO — BLOG INDEX
═══════════════════════════════════════════ */
.hero{
  position:relative;overflow:hidden;
  background:var(--bg-2);
  padding:108px var(--page-pad) 96px;
  border-bottom:1px solid var(--border);
}
/* Subtle dot-grid background */
.hero::before{
  content:'';position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(99,179,255,.12) 1px,transparent 1px);
  background-size:36px 36px;
  pointer-events:none;
}
.hero-orbs{position:absolute;inset:0;pointer-events:none}
.orb{position:absolute;border-radius:50%;filter:blur(90px)}
.orb-1{width:560px;height:560px;background:radial-gradient(circle,rgba(59,130,246,.18),transparent);top:-180px;right:-120px;animation:float 9s ease-in-out infinite}
.orb-2{width:320px;height:320px;background:radial-gradient(circle,rgba(34,211,238,.12),transparent);bottom:-100px;left:8%;animation:float 12s ease-in-out infinite reverse}
.hero-content{position:relative;max-width:var(--max-w);margin:0 auto}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(99,179,255,.1);border:1px solid rgba(99,179,255,.22);
  color:var(--blue-bright);font-size:.72rem;font-weight:700;
  letter-spacing:.13em;text-transform:uppercase;
  padding:6px 16px;border-radius:100px;margin-bottom:30px;
  animation:fadeUp .5s ease both;
}
.badge-dot{width:6px;height:6px;background:var(--cyan);border-radius:50%;animation:pulse-dot 2s ease-in-out infinite}
.hero h1{
  font-family:var(--font-display);
  font-size:clamp(2.8rem,5.5vw,4.6rem);
  font-weight:700;color:var(--text-primary);
  line-height:1.1;letter-spacing:-.03em;
  max-width:700px;margin-bottom:24px;
  animation:fadeUp .5s .1s ease both;
}
.hero h1 em{
  font-style:italic;
  background:linear-gradient(90deg,var(--blue-bright),var(--cyan));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero-desc{
  color:var(--text-secondary);font-size:1.08rem;font-weight:300;
  max-width:520px;line-height:1.75;margin-bottom:42px;
  animation:fadeUp .5s .2s ease both;
}
.hero-search{display:flex;gap:10px;max-width:520px;animation:fadeUp .5s .3s ease both}
.hero-search input{
  flex:1;background:var(--bg-card);border:1px solid var(--border-med);
  border-radius:12px;padding:14px 20px;color:var(--text-primary);
  font-family:var(--font-body);font-size:.9rem;outline:none;
  transition:border .2s,background .2s;
}
.hero-search input::placeholder{color:var(--text-muted)}
.hero-search input:focus{border-color:var(--blue-bright);background:var(--bg-card-2);box-shadow:0 0 0 3px rgba(99,179,255,.12)}
.hero-search button{
  background:var(--blue-mid);color:#fff;border-radius:12px;
  padding:14px 24px;font-family:var(--font-body);font-size:.875rem;font-weight:600;
  display:flex;align-items:center;gap:8px;
  transition:background .2s,transform .15s var(--spring),box-shadow .2s;
  box-shadow:0 4px 16px rgba(59,130,246,.4);white-space:nowrap;
}
.hero-search button:hover{background:var(--blue-bright);color:var(--bg);transform:translateY(-2px);box-shadow:0 8px 24px rgba(99,179,255,.5)}
.hero-stats{display:flex;gap:44px;margin-top:56px;animation:fadeUp .5s .4s ease both;flex-wrap:wrap}
.stat-num{font-family:var(--font-display);font-size:2rem;font-weight:700;color:var(--text-primary);line-height:1;margin-bottom:4px}
.stat-label{font-size:.75rem;color:var(--text-muted);font-weight:400;letter-spacing:.06em;text-transform:uppercase}

/* ═══════════════════════════════════════════
   FILTER BAR
═══════════════════════════════════════════ */
.filter-bar{
  background:var(--bg-2);
  border-bottom:1px solid var(--border);
  position:sticky;top:66px;z-index:100;
}
.filter-bar-inner{display:flex;align-items:center;gap:8px;overflow-x:auto;padding:14px 0;scrollbar-width:none}
.filter-bar-inner::-webkit-scrollbar{display:none}
.filter-pill{
  flex-shrink:0;padding:8px 20px;border-radius:100px;
  font-size:.83rem;font-weight:500;
  border:1px solid var(--border-med);background:transparent;
  color:var(--text-secondary);cursor:pointer;
  transition:all .2s var(--ease);white-space:nowrap;
  font-family:var(--font-body);display:inline-flex;align-items:center;gap:6px;
}
.filter-pill:hover{background:var(--blue-subtle);color:var(--blue-bright);border-color:var(--border-accent)}
.filter-pill.active{background:var(--blue-mid);color:#fff;border-color:var(--blue-mid);box-shadow:0 2px 12px rgba(59,130,246,.35)}
.pill-count{background:rgba(255,255,255,.15);padding:1px 7px;border-radius:100px;font-size:.68rem;font-weight:700}
.filter-pill:not(.active) .pill-count{background:rgba(255,255,255,.07);color:var(--text-muted)}

/* ═══════════════════════════════════════════
   BLOG LAYOUT
═══════════════════════════════════════════ */
.blog-layout{
  max-width:var(--max-w);margin:0 auto;
  padding:60px var(--page-pad) 100px;
  display:grid;grid-template-columns:1fr 340px;gap:56px;
  align-items:start;
}

/* ═══════════════════════════════════════════
   FEATURED POST
═══════════════════════════════════════════ */
.featured-wrap{grid-column:1/-1;margin-bottom:8px}
.featured-post{
  display:grid;grid-template-columns:1.1fr 1fr;
  background:var(--bg-card);border-radius:var(--r-xl);
  overflow:hidden;border:1px solid var(--border-med);
  text-decoration:none;color:inherit;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s;
  box-shadow:var(--shadow-md);
}
.featured-post:hover{transform:translateY(-5px);box-shadow:var(--shadow-xl),var(--glow-blue);border-color:var(--border-accent)}
.featured-vis{
  position:relative;min-height:400px;
  background:linear-gradient(145deg,#060c1a,#0f1e3d,#1a3460);
  display:flex;align-items:center;justify-content:center;overflow:hidden;
}
.featured-vis::before{
  content:'';position:absolute;inset:0;
  background:
    radial-gradient(ellipse 70% 70% at 20% 50%,rgba(34,211,238,.15) 0%,transparent 60%),
    radial-gradient(ellipse 60% 60% at 80% 20%,rgba(99,179,255,.2) 0%,transparent 60%);
}
.featured-vis-grid{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:40px 40px;
}
.featured-emoji{position:relative;z-index:2;font-size:5.5rem;filter:drop-shadow(0 8px 40px rgba(99,179,255,.5));animation:float 6s ease-in-out infinite}
.featured-badge-wrap{
  position:absolute;top:22px;left:22px;z-index:3;
  background:rgba(99,179,255,.15);border:1px solid rgba(99,179,255,.3);
  backdrop-filter:blur(8px);color:var(--blue-bright);
  font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  padding:6px 14px;border-radius:100px;
}
.featured-cat-tag{
  position:absolute;bottom:22px;left:22px;z-index:3;
  background:var(--cyan);color:var(--bg);
  font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;
  padding:5px 12px;border-radius:100px;
}
.featured-body{padding:52px 48px;display:flex;flex-direction:column;justify-content:center}
.post-meta-row{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-size:.78rem;color:var(--text-muted)}
.meta-dot{width:3px;height:3px;background:var(--border-med);border-radius:50%}
.meta-cat{color:var(--blue-bright);font-weight:700;text-transform:uppercase;letter-spacing:.07em;font-size:.68rem}
.featured-body h2{
  font-family:var(--font-display);
  font-size:clamp(1.6rem,2.5vw,2.1rem);font-weight:700;
  line-height:1.2;letter-spacing:-.025em;
  color:var(--text-primary);margin-bottom:16px;
}
.post-excerpt{color:var(--text-secondary);font-size:.95rem;line-height:1.72;margin-bottom:28px;font-weight:300}
.btn-read{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--blue-mid);color:#fff;
  padding:13px 26px;border-radius:100px;
  font-size:.875rem;font-weight:600;
  transition:background .2s,transform .15s var(--spring),box-shadow .2s;
  box-shadow:0 2px 12px rgba(59,130,246,.4);align-self:flex-start;
}
.btn-read:hover{background:var(--blue-bright);color:var(--bg);transform:translateY(-1px);box-shadow:0 6px 24px rgba(99,179,255,.5)}
.btn-read svg{transition:transform .2s}
.btn-read:hover svg{transform:translateX(3px)}

/* ═══════════════════════════════════════════
   SECTION HEADER
═══════════════════════════════════════════ */
.section-header{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:28px}
.section-title{font-family:var(--font-display);font-size:1.65rem;font-weight:700;color:var(--text-primary);letter-spacing:-.025em}
.section-link{font-size:.83rem;font-weight:600;color:var(--blue-bright);display:flex;align-items:center;gap:4px;transition:gap .2s;opacity:.8}
.section-link:hover{gap:8px;opacity:1}

/* ═══════════════════════════════════════════
   POST CARDS
═══════════════════════════════════════════ */
.posts-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-bottom:40px}
.post-card{
  background:var(--bg-card);border-radius:var(--r-lg);
  overflow:hidden;border:1px solid var(--border);
  text-decoration:none;color:inherit;display:flex;flex-direction:column;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s;
}
.post-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg),var(--glow-blue);border-color:var(--border-accent)}
.post-card-vis{
  height:190px;position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;font-size:2.8rem;
}
.post-card-vis::after{content:'';position:absolute;inset:0;background:linear-gradient(to bottom,transparent 40%,rgba(0,0,0,.3) 100%)}

/* Card gradients — all dark-themed */
.vc-1{background:linear-gradient(145deg,#06101e,#0f2040,#1a3a6e)}
.vc-2{background:linear-gradient(145deg,#050e1c,#0a1830,#162d58)}
.vc-3{background:linear-gradient(145deg,#021014,#024060,#027090)}
.vc-4{background:linear-gradient(145deg,#080e20,#102040,#1a3870)}
.vc-5{background:linear-gradient(145deg,#04080f,#0a1428,#1020500)}
.vc-6{background:linear-gradient(145deg,#050a1a,#0a1436,#101e60)}
.vc-7{background:linear-gradient(145deg,#020c10,#043050,#066080)}
.vc-8{background:linear-gradient(145deg,#080416,#180840,#280e80)}

.card-cat-badge{
  position:absolute;top:14px;left:14px;z-index:2;
  background:rgba(99,179,255,.15);border:1px solid rgba(99,179,255,.25);
  backdrop-filter:blur(8px);color:var(--blue-bright);
  font-size:.65rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:4px 10px;border-radius:100px;
}
.post-card-body{padding:22px;flex:1;display:flex;flex-direction:column}
.post-card-body h3{
  font-family:var(--font-display);font-size:1.05rem;font-weight:600;
  line-height:1.35;color:var(--text-primary);margin-bottom:10px;
  letter-spacing:-.015em;transition:color .2s;
}
.post-card:hover h3{color:var(--blue-bright)}
.post-card-body p{font-size:.85rem;color:var(--text-secondary);line-height:1.65;flex:1;margin-bottom:18px;font-weight:300}
.post-card-footer{
  display:flex;align-items:center;justify-content:space-between;
  font-size:.76rem;color:var(--text-muted);
  padding-top:14px;border-top:1px solid var(--border);
}
.post-tag{
  background:rgba(99,179,255,.1);color:var(--blue-bright);
  padding:3px 10px;border-radius:100px;
  font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;
  border:1px solid rgba(99,179,255,.18);
}
.post-card-wide{grid-column:1/-1;display:grid;grid-template-columns:280px 1fr}
.post-card-wide .post-card-vis{height:auto;min-height:210px}
.post-card-wide .post-card-body{padding:30px}
.post-card-wide h3{font-size:1.22rem}

/* Load more */
.load-more-wrap{text-align:center;padding:16px 0 32px}
.btn-load-more{
  background:transparent;border:1px solid var(--border-accent);
  color:var(--blue-bright);padding:14px 40px;border-radius:100px;
  font-family:var(--font-body);font-size:.9rem;font-weight:600;
  cursor:pointer;transition:all .2s var(--ease);
  display:inline-flex;align-items:center;gap:8px;
}
.btn-load-more:hover{background:var(--blue-mid);border-color:var(--blue-mid);color:#fff;box-shadow:0 4px 18px rgba(59,130,246,.35);transform:translateY(-1px)}

/* ═══════════════════════════════════════════
   SIDEBAR
═══════════════════════════════════════════ */
.sidebar{display:flex;flex-direction:column;gap:22px}
.sidebar-card{
  background:var(--bg-card);border-radius:var(--r-lg);
  border:1px solid var(--border);padding:24px;
  box-shadow:var(--shadow-sm);
}
.sidebar-card-title{
  font-family:var(--font-display);font-size:1rem;font-weight:700;
  color:var(--text-primary);letter-spacing:-.01em;
  margin-bottom:18px;padding-bottom:14px;
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;
}
.sidebar-card-title span{color:var(--blue-bright)}

/* Popular list */
.popular-list{list-style:none;display:flex;flex-direction:column}
.popular-item{
  display:flex;gap:14px;align-items:flex-start;
  padding:12px 0;border-bottom:1px solid var(--border);
  text-decoration:none;color:inherit;transition:opacity .2s;
}
.popular-item:last-child{border-bottom:none;padding-bottom:0}
.popular-item:hover{opacity:.65}
.popular-num{font-family:var(--font-display);font-size:1.3rem;font-weight:700;color:var(--text-muted);line-height:1;min-width:26px;margin-top:2px}
.popular-title{font-size:.85rem;font-weight:500;color:var(--text-secondary);line-height:1.4;margin-bottom:3px}
.popular-meta{font-size:.72rem;color:var(--text-muted)}

/* Newsletter card */
.newsletter-card{
  background:var(--bg-card);border-radius:var(--r-lg);
  padding:26px;position:relative;overflow:hidden;
  border:1px solid var(--border-accent);
  box-shadow:var(--glow-blue);
}
.newsletter-card::before{
  content:'';position:absolute;top:-50px;right:-50px;
  width:200px;height:200px;
  background:radial-gradient(circle,rgba(99,179,255,.12) 0%,transparent 70%);
  pointer-events:none;
}
.newsletter-card::after{
  content:'';position:absolute;bottom:-30px;left:-20px;
  width:140px;height:140px;
  background:radial-gradient(circle,rgba(34,211,238,.08) 0%,transparent 70%);
  pointer-events:none;
}
.nl-icon{font-size:1.8rem;margin-bottom:12px;position:relative;z-index:1}
.newsletter-card h4{font-family:var(--font-display);font-size:1.15rem;font-weight:700;color:var(--text-primary);margin-bottom:8px;position:relative;z-index:1;letter-spacing:-.02em}
.newsletter-card p{font-size:.82rem;color:var(--text-secondary);margin-bottom:18px;position:relative;z-index:1;font-weight:300;line-height:1.6}
.nl-input{
  width:100%;background:var(--bg);border:1px solid var(--border-med);
  border-radius:10px;padding:12px 15px;color:var(--text-primary);
  font-family:var(--font-body);font-size:.875rem;outline:none;
  margin-bottom:10px;transition:border .2s,box-shadow .2s;
  position:relative;z-index:1;
}
.nl-input::placeholder{color:var(--text-muted)}
.nl-input:focus{border-color:var(--blue-bright);box-shadow:0 0 0 3px rgba(99,179,255,.12)}
.nl-btn{
  width:100%;background:linear-gradient(135deg,var(--blue-mid),var(--blue-bright));
  color:#fff;border-radius:10px;padding:13px;
  font-family:var(--font-body);font-size:.875rem;font-weight:700;cursor:pointer;
  transition:opacity .2s,transform .15s;position:relative;z-index:1;
  box-shadow:0 4px 18px rgba(59,130,246,.4);
}
.nl-btn:hover{opacity:.9;transform:translateY(-1px)}
.nl-fine{font-size:.7rem;color:var(--text-muted);text-align:center;margin-top:10px;position:relative;z-index:1}

/* Tag cloud */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud a{
  padding:6px 13px;border-radius:100px;font-size:.76rem;font-weight:500;
  background:var(--bg-raised);color:var(--text-secondary);
  border:1px solid var(--border);transition:all .2s;
}
.tag-cloud a:hover{background:var(--blue-mid);color:#fff;border-color:var(--blue-mid);transform:translateY(-1px)}

/* Shop CTA */
.shop-cta-card{
  background:linear-gradient(145deg,var(--bg-card),var(--bg-card-2));
  border:1px solid var(--border-accent);border-radius:var(--r-lg);
  padding:24px;text-align:center;
  box-shadow:var(--glow-blue);
}
.shop-cta-card .cta-icon{font-size:2.2rem;margin-bottom:12px}
.shop-cta-card h4{font-family:var(--font-display);font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}
.shop-cta-card p{font-size:.81rem;color:var(--text-secondary);margin-bottom:18px;line-height:1.55;font-weight:300}
.btn-shop{
  display:block;background:var(--blue-mid);color:#fff;
  border-radius:100px;padding:12px 20px;
  font-size:.875rem;font-weight:700;text-align:center;
  transition:background .2s,transform .15s var(--spring),box-shadow .2s;
  box-shadow:0 2px 12px rgba(59,130,246,.35);
}
.btn-shop:hover{background:var(--blue-bright);color:var(--bg);transform:translateY(-1px);box-shadow:0 6px 22px rgba(99,179,255,.5)}

/* ═══════════════════════════════════════════
   SINGLE POST — HERO
═══════════════════════════════════════════ */
#reading-progress{
  position:fixed;top:0;left:0;height:3px;
  background:linear-gradient(90deg,var(--blue-mid),var(--cyan));
  width:0%;z-index:9999;border-radius:0 2px 2px 0;
  transition:width .1s linear;
}
.post-hero{
  background:var(--bg-2);
  padding:88px var(--page-pad) 76px;
  position:relative;overflow:hidden;
  border-bottom:1px solid var(--border);
}
.post-hero::before{
  content:'';position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(99,179,255,.1) 1px,transparent 1px);
  background-size:36px 36px;pointer-events:none;
}
.post-hero-inner{position:relative;max-width:780px;margin:0 auto}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  font-size:.78rem;color:var(--text-muted);margin-bottom:24px;
  animation:fadeUp .4s ease both;flex-wrap:wrap;
}
.breadcrumb a{color:var(--text-muted);transition:color .2s}
.breadcrumb a:hover{color:var(--blue-bright)}
.post-hero-cat{
  display:inline-block;background:rgba(34,211,238,.12);
  border:1px solid rgba(34,211,238,.25);
  color:var(--cyan);font-size:.68rem;font-weight:800;
  text-transform:uppercase;letter-spacing:.12em;
  padding:5px 14px;border-radius:100px;margin-bottom:20px;
  animation:fadeUp .4s .05s ease both;
}
.post-hero h1{
  font-family:var(--font-display);font-size:clamp(2rem,4vw,3.2rem);
  font-weight:700;color:var(--text-primary);line-height:1.15;
  letter-spacing:-.03em;margin-bottom:20px;
  animation:fadeUp .4s .1s ease both;
}
.post-hero-excerpt{
  font-size:1.04rem;color:var(--text-secondary);
  font-weight:300;line-height:1.72;margin-bottom:34px;
  animation:fadeUp .4s .15s ease both;
}
.post-meta-bar{
  display:flex;align-items:center;flex-wrap:wrap;gap:20px;
  animation:fadeUp .4s .2s ease both;
}
.post-author{display:flex;align-items:center;gap:10px}
.author-ava{
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,var(--blue-mid),var(--cyan));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:.88rem;flex-shrink:0;
}
.author-name{font-size:.875rem;font-weight:600;color:var(--text-secondary)}
.author-role{font-size:.73rem;color:var(--text-muted)}
.meta-divider{width:1px;height:26px;background:var(--border-med)}
.meta-item{display:flex;align-items:center;gap:6px;font-size:.78rem;color:var(--text-muted)}
.meta-item svg{opacity:.5}

/* ═══════════════════════════════════════════
   ARTICLE LAYOUT
═══════════════════════════════════════════ */
.post-layout{
  max-width:var(--max-w);margin:0 auto;
  padding:56px var(--page-pad) 96px;
  display:grid;grid-template-columns:1fr 300px;gap:52px;align-items:start;
}
.post-content{
  background:var(--bg-card);border-radius:var(--r-xl);
  border:1px solid var(--border);overflow:hidden;
  box-shadow:var(--shadow-md);
}
.post-body{padding:52px 54px}
.post-body h2{
  font-family:var(--font-display);font-size:1.65rem;font-weight:700;
  color:var(--text-primary);margin:42px 0 16px;
  letter-spacing:-.025em;line-height:1.25;
}
.post-body h2:first-child{margin-top:0}
.post-body h3{
  font-family:var(--font-display);font-size:1.2rem;font-weight:600;
  color:var(--text-primary);margin:28px 0 12px;letter-spacing:-.02em;
}
.post-body p{color:var(--text-secondary);line-height:1.82;margin-bottom:20px;font-size:1rem;font-weight:300}
.post-body strong{color:var(--text-primary);font-weight:600}
.post-body a{color:var(--blue-bright);text-decoration:underline;text-underline-offset:3px}
.post-body ul,.post-body ol{padding-left:24px;margin-bottom:20px}
.post-body li{color:var(--text-secondary);line-height:1.78;margin-bottom:8px;font-weight:300}
.post-body blockquote{
  border-left:3px solid var(--blue-bright);
  padding:16px 24px;
  background:var(--blue-subtle);
  border-radius:0 var(--r-sm) var(--r-sm) 0;margin:28px 0;
}
.post-body blockquote p{color:var(--blue-bright);font-style:italic;margin:0;font-weight:400;font-size:1.02rem;opacity:.9}
.post-body hr{border:none;border-top:1px solid var(--border);margin:36px 0}

.info-box{
  background:var(--blue-subtle);border:1px solid var(--border-accent);
  border-radius:var(--r);padding:18px 22px;margin:26px 0;
  display:flex;gap:14px;
}
.info-box-icon{font-size:1.15rem;flex-shrink:0;margin-top:2px}
.info-box-body{font-size:.88rem;color:var(--blue-bright);line-height:1.65;opacity:.9}
.info-box-body strong{color:var(--text-primary)}
.warn-box{
  background:rgba(251,191,36,.06);border:1px solid rgba(251,191,36,.2);
  border-radius:var(--r);padding:18px 22px;margin:26px 0;display:flex;gap:14px;
}
.warn-box .info-box-body{color:var(--amber);opacity:.85}

.table-wrap{overflow-x:auto;margin:26px 0;border-radius:var(--r);border:1px solid var(--border-med)}
.data-table{width:100%;border-collapse:collapse;font-size:.865rem}
.data-table thead{background:rgba(99,179,255,.08)}
.data-table th{
  padding:12px 16px;text-align:left;
  color:var(--blue-bright);font-size:.72rem;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;
  border-bottom:1px solid var(--border-med);
}
.data-table tbody tr{border-bottom:1px solid var(--border)}
.data-table tbody tr:last-child{border-bottom:none}
.data-table tbody tr:hover{background:rgba(99,179,255,.04)}
.data-table td{padding:12px 16px;color:var(--text-secondary);font-weight:300;line-height:1.5}
.data-table td:first-child{font-weight:500;color:var(--text-primary)}

.post-tags{
  padding:26px 52px;border-top:1px solid var(--border);
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.tags-label{font-size:.75rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em}
.post-share{padding:26px 52px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px}
.share-label{font-size:.82rem;font-weight:600;color:var(--text-muted);margin-right:4px}
.share-btn{
  width:36px;height:36px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-raised);color:var(--text-secondary);
  cursor:pointer;transition:all .2s;font-size:.85rem;border:1px solid var(--border);
}
.share-btn:hover{background:var(--blue-mid);color:#fff;border-color:var(--blue-mid);transform:translateY(-1px)}

/* TOC */
.toc-card{
  background:var(--bg-card);border-radius:var(--r-lg);
  border:1px solid var(--border);padding:22px;
  position:sticky;top:96px;max-height:calc(100vh - 140px);
  overflow-y:auto;box-shadow:var(--shadow-sm);
}
.toc-card::-webkit-scrollbar{width:4px}
.toc-card::-webkit-scrollbar-track{background:transparent}
.toc-card::-webkit-scrollbar-thumb{background:var(--border-med);border-radius:2px}
.toc-heading{
  font-size:.7rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.12em;color:var(--text-muted);
  margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--border);
}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:2px}
.toc-item a{
  display:block;padding:7px 10px;border-radius:8px;
  font-size:.82rem;color:var(--text-muted);font-weight:400;
  transition:all .2s;line-height:1.4;
}
.toc-item a:hover{background:var(--blue-subtle);color:var(--blue-bright)}
.toc-item.active a{background:var(--blue-subtle);color:var(--blue-bright);font-weight:600}
.toc-h3 a{padding-left:22px;font-size:.78rem}

/* Related posts */
.related-section{max-width:var(--max-w);margin:0 auto;padding:0 var(--page-pad) 80px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}

/* ═══════════════════════════════════════════
   TRUST STRIP
═══════════════════════════════════════════ */
.trust-strip{
  background:var(--bg-card);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  padding:22px var(--page-pad);
}
.trust-inner{
  max-width:var(--max-w);margin:0 auto;
  display:flex;align-items:center;justify-content:center;
  gap:clamp(20px,4vw,56px);flex-wrap:wrap;
}
.trust-item{
  display:flex;align-items:center;gap:10px;
  color:var(--text-secondary);font-size:.8rem;font-weight:500;white-space:nowrap;
}
.trust-item svg{color:var(--cyan);flex-shrink:0}

/* ═══════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════ */
.footer{background:var(--bg-2);border-top:1px solid var(--border)}
.footer-top{
  max-width:var(--max-w);margin:0 auto;
  padding:56px var(--page-pad) 48px;
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;
}
.footer-logo-wrap{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-logo-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--blue-mid),var(--blue-bright));border-radius:9px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:.95rem}
.footer-logo-text{font-family:var(--font-display);font-size:1.1rem;font-weight:700;color:var(--text-primary)}
.footer-logo-text span{color:var(--cyan)}
.footer-tagline{font-size:.82rem;color:var(--text-muted);line-height:1.65;max-width:260px;margin-bottom:22px;font-weight:300}
.footer-social{display:flex;gap:10px}
.social-btn{
  width:34px;height:34px;border-radius:8px;
  background:var(--bg-raised);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-muted);font-size:.82rem;transition:all .2s;
}
.social-btn:hover{background:var(--blue-mid);border-color:var(--blue-mid);color:#fff;transform:translateY(-2px)}
.footer-col h5{
  font-size:.72rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.11em;color:var(--text-muted);margin-bottom:16px;
}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer-col ul a{font-size:.85rem;color:var(--text-muted);transition:color .2s;font-weight:300}
.footer-col ul a:hover{color:var(--text-primary)}
.footer-bottom{
  max-width:var(--max-w);margin:0 auto;
  padding:18px var(--page-pad);
  border-top:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;
}
.footer-bottom p,.footer-bottom a{font-size:.76rem;color:var(--text-muted);font-weight:300}
.footer-bottom a:hover{color:var(--text-secondary)}
.footer-bottom-links{display:flex;gap:18px}
.footer-disclaimer{max-width:var(--max-w);margin:0 auto;padding:0 var(--page-pad) 24px}
.footer-disclaimer p{
  font-size:.7rem;color:var(--text-muted);line-height:1.65;
  font-style:italic;border-top:1px solid var(--border);
  padding-top:16px;font-weight:300;opacity:.6;
}

/* ═══════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════ */
@media(max-width:1024px){
  .blog-layout{grid-template-columns:1fr}
  .sidebar{display:grid;grid-template-columns:repeat(2,1fr)}
  .posts-grid{grid-template-columns:repeat(2,1fr)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .featured-post{grid-template-columns:1fr}
  .featured-vis{min-height:220px}
  .featured-body{padding:30px 26px}
  .post-layout{grid-template-columns:1fr}
  .post-body{padding:30px 22px}
  .post-tags,.post-share{padding:18px 22px}
  .post-card-wide{grid-template-columns:1fr}
  .post-card-wide .post-card-vis{min-height:160px}
  .sidebar{grid-template-columns:1fr}
  .nav-links{display:none}
  .nav-links.open{
    display:flex;position:fixed;top:66px;left:0;right:0;
    flex-direction:column;background:var(--bg-2);
    padding:16px var(--page-pad) 24px;
    border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-lg);gap:4px;
  }
  .nav-hamburger{display:flex}
  .footer-top{grid-template-columns:1fr;gap:26px}
  .related-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
  .posts-grid{grid-template-columns:1fr}
  .trust-inner{gap:16px}
  .footer-bottom{flex-direction:column;text-align:center}
}
@media print{
  .nav,.filter-bar,.sidebar,.trust-strip,.footer,.post-share{display:none}
  .post-layout{grid-template-columns:1fr}
  .post-body{padding:0}
  body{background:#fff;color:#000}
}