/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#fafafa;--surface:#fff;--border:#e5e5e5;
  --text:#171717;--text-secondary:#525252;--text-tertiary:#a3a3a3;
  --accent:#6366f1;--accent-hover:#4f46e5;--accent-light:#eef2ff;
  --radius:12px;--radius-sm:8px;
  --font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --font-mono:'SF Mono',SFMono-Regular,ui-monospace,'DejaVu Sans Mono',Menlo,Consolas,monospace;
  --max-w:1200px;--content-w:720px;
  --shadow-sm:0 1px 2px rgba(0,0,0,.05);
  --shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
  --shadow-lg:0 4px 12px rgba(0,0,0,.08);
  --transition:150ms ease;
}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent-hover)}
img{max-width:100%;display:block}
::selection{background:var(--accent);color:#fff}

/* ===== LAYOUT ===== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}
.content-width{max-width:var(--content-w);margin:0 auto}

/* ===== NAV ===== */
.nav{position:sticky;top:0;z-index:100;background:rgba(250,250,250,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{font-weight:700;font-size:1.125rem;color:var(--text);display:flex;align-items:center;gap:8px}
.nav-logo svg{width:24px;height:24px}
.nav-links{display:flex;gap:32px;list-style:none}
.nav-links a{color:var(--text-secondary);font-size:.875rem;font-weight:500;transition:color var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-mobile-toggle{display:none;background:none;border:none;cursor:pointer;padding:4px;color:var(--text)}
@media(max-width:640px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;padding:16px 24px;gap:16px}
  .nav-links.open{display:flex}
  .nav-mobile-toggle{display:block}
}

/* ===== HERO ===== */
.hero{padding:80px 0 64px;text-align:center}
.hero h1{font-size:clamp(2rem,5vw,3.25rem);font-weight:800;letter-spacing:-.03em;line-height:1.15;margin-bottom:16px}
.hero h1 .accent{color:var(--accent)}
.hero p{font-size:1.125rem;color:var(--text-secondary);max-width:560px;margin:0 auto 32px}
.hero-cta{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;background:var(--accent);color:#fff;border-radius:999px;font-weight:600;font-size:.9375rem;transition:background var(--transition),transform var(--transition)}
.hero-cta:hover{background:var(--accent-hover);color:#fff;transform:translateY(-1px)}

/* ===== SECTION ===== */
.section{padding:48px 0}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}
.section-title{font-size:1.5rem;font-weight:700;letter-spacing:-.02em}
.section-link{font-size:.875rem;font-weight:500;color:var(--accent)}

/* ===== CARD GRID ===== */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
@media(max-width:400px){.card-grid{grid-template-columns:1fr}}

.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:box-shadow var(--transition),transform var(--transition)}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card-thumb{aspect-ratio:16/9;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:2.5rem;overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover}
.card-body{padding:20px}
.card-category{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);margin-bottom:8px}
.card-title{font-size:1.125rem;font-weight:700;line-height:1.35;margin-bottom:8px;color:var(--text)}
.card-title a{color:inherit}
.card-title a:hover{color:var(--accent)}
.card-excerpt{font-size:.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{font-size:.75rem;color:var(--text-tertiary);display:flex;align-items:center;gap:12px}

/* ===== NEWSLETTER ===== */
.newsletter{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:48px;text-align:center;margin:48px 0}
.newsletter h2{font-size:1.5rem;font-weight:700;margin-bottom:8px}
.newsletter p{color:var(--text-secondary);margin-bottom:24px;font-size:.9375rem}
.newsletter-form{display:flex;gap:8px;max-width:420px;margin:0 auto}
.newsletter-form input{flex:1;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.9375rem;font-family:var(--font);outline:none;transition:border-color var(--transition)}
.newsletter-form input:focus{border-color:var(--accent)}
.newsletter-form button{padding:12px 24px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-weight:600;font-size:.9375rem;cursor:pointer;white-space:nowrap;transition:background var(--transition)}
.newsletter-form button:hover{background:var(--accent-hover)}
@media(max-width:480px){.newsletter{padding:32px 20px}.newsletter-form{flex-direction:column}}

/* ===== ARTICLE HERO GRADIENTS ===== */
.article-hero{position:relative;padding:100px 24px 60px;text-align:center;overflow:hidden;border-radius:0 0 24px 24px;margin-bottom:40px}
.article-hero::before{content:'';position:absolute;inset:0;z-index:0}
.article-hero::after{content:'';position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,transparent 40%,rgba(0,0,0,0.4) 100%)}
.article-hero *{position:relative;z-index:2}
.article-hero h1{color:#fff;text-shadow:0 2px 20px rgba(0,0,0,0.3)}
.article-hero .card-category{background:rgba(255,255,255,0.15);backdrop-filter:blur(8px);padding:6px 14px;border-radius:999px;color:#fff;display:inline-block}
.article-hero .article-meta{color:rgba(255,255,255,0.8)}

/* Gradient themes per article */
.hero-gradient-1::before{background:linear-gradient(135deg,#0f0c29,#302b63,#24243e);background-size:400% 400%;animation:gradientShift 8s ease infinite}
.hero-gradient-1::after{background:radial-gradient(ellipse at 30% 50%,rgba(99,102,241,0.3),transparent 60%),radial-gradient(ellipse at 70% 30%,rgba(34,211,238,0.2),transparent 50%),linear-gradient(180deg,transparent 50%,rgba(0,0,0,0.3) 100%)}

.hero-gradient-2::before{background:linear-gradient(135deg,#0d1b2a,#1b2838,#0a4d68);background-size:400% 400%;animation:gradientShift 8s ease infinite}
.hero-gradient-2::after{background:radial-gradient(ellipse at 60% 40%,rgba(34,197,94,0.25),transparent 60%),radial-gradient(ellipse at 20% 70%,rgba(56,189,248,0.2),transparent 50%),linear-gradient(180deg,transparent 50%,rgba(0,0,0,0.3) 100%)}

.hero-gradient-3::before{background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);background-size:400% 400%;animation:gradientShift 8s ease infinite}
.hero-gradient-3::after{background:radial-gradient(ellipse at 40% 30%,rgba(168,85,247,0.3),transparent 60%),radial-gradient(ellipse at 80% 60%,rgba(251,146,60,0.2),transparent 50%),linear-gradient(180deg,transparent 50%,rgba(0,0,0,0.3) 100%)}

.hero-gradient-4::before{background:linear-gradient(135deg,#0c0c1d,#1a1a3e,#2d1b69);background-size:400% 400%;animation:gradientShift 8s ease infinite}
.hero-gradient-4::after{background:radial-gradient(ellipse at 50% 50%,rgba(236,72,153,0.25),transparent 60%),radial-gradient(ellipse at 30% 70%,rgba(99,102,241,0.2),transparent 50%),linear-gradient(180deg,transparent 50%,rgba(0,0,0,0.3) 100%)}

.hero-gradient-5::before{background:linear-gradient(135deg,#001219,#005f73,#0a9396);background-size:400% 400%;animation:gradientShift 8s ease infinite}
.hero-gradient-5::after{background:radial-gradient(ellipse at 70% 40%,rgba(94,234,212,0.3),transparent 60%),radial-gradient(ellipse at 20% 60%,rgba(34,211,238,0.2),transparent 50%),linear-gradient(180deg,transparent 50%,rgba(0,0,0,0.3) 100%)}

@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}

/* Card thumbnail gradients */
.card-thumb.thumb-1{background:linear-gradient(135deg,#302b63,#24243e,#6366f1)}
.card-thumb.thumb-2{background:linear-gradient(135deg,#0d1b2a,#0a4d68,#22c55e)}
.card-thumb.thumb-3{background:linear-gradient(135deg,#1a1a2e,#0f3460,#a855f7)}
.card-thumb.thumb-4{background:linear-gradient(135deg,#0c0c1d,#2d1b69,#ec4899)}
.card-thumb.thumb-5{background:linear-gradient(135deg,#001219,#0a9396,#5eead4)}

.card-thumb svg{width:48px;height:48px;stroke:rgba(255,255,255,0.6);stroke-width:1.5;fill:none}

/* ===== ARTICLE ===== */
.article-header{padding:64px 0 32px;text-align:center}
.article-header .card-category{margin-bottom:12px}
.article-header h1{font-size:clamp(1.75rem,4vw,2.5rem);font-weight:800;letter-spacing:-.03em;line-height:1.2;margin-bottom:16px;max-width:800px;margin-left:auto;margin-right:auto}
.article-meta{display:flex;align-items:center;justify-content:center;gap:16px;color:var(--text-secondary);font-size:.875rem}
.article-meta img{width:36px;height:36px;border-radius:50%;background:var(--accent-light)}
.article-content{padding-bottom:64px}
.article-content h2{font-size:1.5rem;font-weight:700;margin:40px 0 16px;letter-spacing:-.02em}
.article-content h3{font-size:1.2rem;font-weight:600;margin:32px 0 12px}
.article-content p{margin-bottom:16px;color:var(--text-secondary)}
.article-content ul,.article-content ol{margin:0 0 16px 24px;color:var(--text-secondary)}
.article-content li{margin-bottom:8px}
.article-content strong{color:var(--text);font-weight:600}
.article-content blockquote{border-left:3px solid var(--accent);padding:12px 20px;margin:24px 0;background:var(--accent-light);border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.article-content blockquote p{color:var(--text);margin:0}
.article-content code{font-family:var(--font-mono);background:#f5f5f5;padding:2px 6px;border-radius:4px;font-size:.875em}
.article-content pre{background:#171717;color:#e5e5e5;padding:20px;border-radius:var(--radius-sm);overflow-x:auto;margin:24px 0}
.article-content pre code{background:none;padding:0;color:inherit}
.article-content a{text-decoration:underline;text-underline-offset:2px}

/* TOC */
.toc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:40px}
.toc-title{font-size:.875rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;color:var(--text-tertiary)}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin-bottom:6px}
.toc a{font-size:.875rem;color:var(--text-secondary)}
.toc a:hover{color:var(--accent)}

/* AUTHOR BOX */
.author-box{display:flex;gap:16px;align-items:center;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin:48px 0}
.author-box img{width:56px;height:56px;border-radius:50%;background:var(--accent-light);flex-shrink:0}
.author-name{font-weight:700;margin-bottom:2px}
.author-bio{font-size:.875rem;color:var(--text-secondary)}

/* RELATED */
.related{padding:48px 0;border-top:1px solid var(--border);margin-top:48px}

/* ===== ABOUT ===== */
.about-hero{padding:80px 0 48px;text-align:center}
.about-hero h1{font-size:2.5rem;font-weight:800;letter-spacing:-.03em;margin-bottom:16px}
.about-hero p{font-size:1.125rem;color:var(--text-secondary);max-width:600px;margin:0 auto}
.about-content{padding-bottom:64px}
.about-content h2{font-size:1.5rem;font-weight:700;margin:40px 0 16px}
.about-content p{color:var(--text-secondary);margin-bottom:16px}

/* ===== CATEGORIES ===== */
.category-pills{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px}
.pill{padding:8px 16px;border:1px solid var(--border);border-radius:999px;font-size:.8125rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition);cursor:pointer}
.pill:hover,.pill.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ===== FOOTER ===== */
.footer{border-top:1px solid var(--border);padding:40px 0;margin-top:48px}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-copy{font-size:.8125rem;color:var(--text-tertiary)}
.footer-links{display:flex;gap:24px;list-style:none}
.footer-links a{font-size:.8125rem;color:var(--text-tertiary);transition:color var(--transition)}
.footer-links a:hover{color:var(--text)}

/* ===== 404 ===== */
.page-404{padding:120px 0;text-align:center}
.page-404 h1{font-size:6rem;font-weight:800;color:var(--accent);line-height:1}
.page-404 p{font-size:1.125rem;color:var(--text-secondary);margin:16px 0 32px}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp .5s ease both}
.fade-up-d1{animation-delay:.1s}
.fade-up-d2{animation-delay:.2s}
.fade-up-d3{animation-delay:.3s}