/* ===== SHARED M3 EXPRESSIVE STYLES ===== */
:root {
  --primary:#1a73e8;--primary-container:#d3e3fd;--primary-on:#fff;
  --secondary:#0d652d;--secondary-container:#c4eed0;
  --tertiary:#b06d0d;--tertiary-container:#ffddb5;
  --surface:#fff;--surface-dim:#f8f9fa;--surface-container:#f1f3f4;
  --surface-container-high:#e8eaed;--surface-container-highest:#dadce0;
  --surface-variant:#e1e3e1;--on-surface:#1f1f1f;--on-surface-variant:#444746;
  --outline:#747775;--outline-variant:#c4c7c5;
  --inverse-surface:#303030;--inverse-on-surface:#f2f2f2;
  --shadow:rgba(0,0,0,0.08);--shadow-md:rgba(0,0,0,0.12);
  --font:'Outfit','Inter',system-ui,sans-serif;
  --font-display:'Outfit',system-ui,sans-serif;
  --radius-xs:8px;--radius-sm:12px;--radius-md:16px;--radius-lg:24px;--radius-xl:28px;--radius-full:9999px;
  --ease-spring:cubic-bezier(0.34,1.56,0.64,1);--ease-standard:cubic-bezier(0.2,0,0,1);
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
::selection{background:var(--primary-container);color:var(--primary);}
html{scroll-behavior:smooth;}
body{background:var(--surface);color:var(--on-surface);font-family:var(--font);font-weight:400;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;}
a{color:inherit;text-decoration:none;}
.container{max-width:1120px;margin:0 auto;padding:0 clamp(1.25rem,5vw,3rem);}
.material-symbols-rounded{font-variation-settings:'FILL' 0,'wght' 400,'GRAD' 0,'opsz' 24;vertical-align:middle;}

/* REVEAL */
.r{opacity:0;transform:translateY(28px);transition:opacity .55s var(--ease-standard),transform .55s var(--ease-spring);}
.r.v{opacity:1;transform:translateY(0);}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:.75rem 0;background:rgba(255,255,255,.85);backdrop-filter:blur(20px) saturate(1.8);transition:box-shadow .3s,padding .3s;}
nav.scrolled{box-shadow:0 1px 3px var(--shadow),0 4px 12px var(--shadow);}
nav .container{display:flex;justify-content:space-between;align-items:center;}
.nav-logo{font-family:var(--font-display);font-weight:700;font-size:1.25rem;display:flex;align-items:center;gap:.35rem;}
.nav-logo-dot{width:10px;height:10px;border-radius:50%;background:var(--primary);display:inline-block;}
.nav-links{display:flex;gap:.35rem;align-items:center;}
.nav-links a{font-size:.875rem;font-weight:500;color:var(--on-surface-variant);padding:.55rem 1rem;border-radius:var(--radius-full);transition:background .25s var(--ease-standard),color .25s;}
.nav-links a:hover{background:var(--surface-container);color:var(--on-surface);}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem;border-radius:var(--radius-full);}
.nav-toggle:hover{background:var(--surface-container);}
.nav-toggle .material-symbols-rounded{font-size:24px;color:var(--on-surface);}
@media(max-width:768px){
  nav{backdrop-filter:none;-webkit-backdrop-filter:none;background:var(--surface);}
  .nav-toggle{display:flex;align-items:center;justify-content:center;}
  .nav-links{position:fixed;inset:0;top:60px;z-index:999;background:var(--surface);flex-direction:column;padding:2rem;gap:.5rem;transform:translateY(-110%);transition:transform .4s var(--ease-spring);box-shadow:0 8px 32px var(--shadow-md);overflow-y:auto;-webkit-overflow-scrolling:touch;}
  .nav-links.open{transform:translateY(0);}
  .nav-links a{font-size:1.1rem;padding:.85rem 1.25rem;width:100%;border-radius:var(--radius-md);}
}

/* FOOTER */
footer{border-top:1px solid var(--outline-variant);padding:1.75rem 0;}
footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem;}
.footer-text{font-size:.72rem;color:var(--outline);}

/* ===== BUTTONS ===== */
.btn-filled{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font);font-size:.875rem;font-weight:600;background:var(--primary);color:var(--primary-on);padding:.75rem 1.75rem;border-radius:var(--radius-full);border:none;cursor:pointer;transition:all .3s var(--ease-spring);box-shadow:0 1px 3px var(--shadow);}
.btn-filled:hover{box-shadow:0 2px 8px rgba(26,115,232,.35);transform:translateY(-1px);}
.btn-tonal{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font);font-size:.875rem;font-weight:600;background:var(--secondary-container);color:var(--secondary);padding:.75rem 1.75rem;border-radius:var(--radius-full);border:none;cursor:pointer;transition:all .3s var(--ease-spring);}
.btn-tonal:hover{box-shadow:0 1px 4px var(--shadow);transform:translateY(-1px);}
.btn-outline{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font);font-size:.875rem;font-weight:600;background:transparent;color:var(--primary);padding:.7rem 1.5rem;border-radius:var(--radius-full);border:1.5px solid var(--outline-variant);cursor:pointer;transition:all .3s var(--ease-spring);}
.btn-outline:hover{background:var(--primary-container);border-color:var(--primary);}

/* ===== SECTION HELPERS ===== */
.section{padding:5.5rem 0;}
.s-label{display:inline-flex;align-items:center;gap:.4rem;font-size:.75rem;font-weight:600;color:var(--primary);background:var(--primary-container);padding:.3rem .85rem;border-radius:var(--radius-full);margin-bottom:1rem;}
.s-title{font-family:var(--font-display);font-size:clamp(1.75rem,3.5vw,2.5rem);font-weight:700;line-height:1.2;color:var(--on-surface);margin-bottom:.6rem;}
.s-desc{color:var(--on-surface-variant);font-size:.95rem;max-width:500px;}
.s-head{margin-bottom:3rem;}

/* ===== POST PAGE ===== */
.post-page{padding-top:5.5rem;padding-bottom:4rem;min-height:100vh;}
.post-header{max-width:720px;margin:0 auto 2.5rem;}
.post-back{display:inline-flex;align-items:center;gap:.35rem;font-size:.82rem;font-weight:500;color:var(--primary);margin-bottom:1.5rem;padding:.4rem .85rem;border-radius:var(--radius-full);transition:background .2s;}
.post-back:hover{background:var(--primary-container);}
.post-meta{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;flex-wrap:wrap;}
.post-cat{font-size:.68rem;font-weight:600;padding:.2rem .6rem;border-radius:var(--radius-full);background:var(--primary-container);color:var(--primary);}
.post-date,.post-read{font-size:.78rem;color:var(--outline);}
.post-title{font-family:var(--font-display);font-size:clamp(1.5rem,4vw,2.6rem);font-weight:700;line-height:1.2;letter-spacing:-.02em;}

.post-body{max-width:720px;margin:0 auto;}
.post-body h2{font-family:var(--font-display);font-size:1.35rem;font-weight:700;margin:2rem 0 .75rem;color:var(--on-surface);}
.post-body h3{font-family:var(--font-display);font-size:1.15rem;font-weight:600;margin:1.75rem 0 .6rem;color:var(--on-surface);}
.post-body h4{font-family:var(--font-display);font-size:1.05rem;font-weight:600;margin:1.5rem 0 .5rem;color:var(--on-surface);}
.post-body p{color:var(--on-surface-variant);margin-bottom:1rem;font-size:.95rem;line-height:1.75;}
.post-body strong{color:var(--on-surface);font-weight:600;}
.post-body em{font-style:italic;}
.post-body blockquote{border-left:3px solid var(--primary);padding:.75rem 1.25rem;margin:1.5rem 0;background:var(--surface-dim);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:.95rem;color:var(--on-surface);font-weight:500;}
.post-body ul,.post-body ol{margin:1rem 0;padding-left:1.5rem;}
.post-body li{color:var(--on-surface-variant);font-size:.92rem;margin-bottom:.4rem;line-height:1.65;}
.post-body hr{border:none;border-top:1px solid var(--outline-variant);margin:2rem 0;}

.post-author{max-width:720px;margin:3rem auto 0;padding:1.5rem;background:var(--surface-dim);border:1px solid var(--outline-variant);border-radius:var(--radius-lg);display:flex;gap:1rem;align-items:center;}
.post-author-avatar{width:48px;height:48px;border-radius:50%;background:var(--primary-container);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.post-author-avatar .material-symbols-rounded{font-size:24px;color:var(--primary);}
.post-author-name{font-family:var(--font-display);font-weight:600;font-size:.95rem;margin-bottom:.15rem;}
.post-author-bio{font-size:.8rem;color:var(--on-surface-variant);line-height:1.55;}

.post-nav{max-width:720px;margin:2rem auto 0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;}
.post-nav-link{display:inline-flex;align-items:center;gap:.35rem;font-size:.82rem;font-weight:500;color:var(--primary);padding:.5rem 1rem;border:1px solid var(--outline-variant);border-radius:var(--radius-full);transition:all .3s var(--ease-spring);}
.post-nav-link:hover{background:var(--primary-container);border-color:var(--primary);}

/* ========== BREADCRUMBS ========== */
.breadcrumbs{padding:0.6rem 0;margin-top:60px;background:var(--surface-dim);border-bottom:1px solid var(--outline-variant);font-size:0.75rem;}
.breadcrumbs .container{display:flex;align-items:center;flex-wrap:wrap;gap:0;}
.bc-link{color:var(--primary);font-weight:500;text-decoration:none;white-space:nowrap;}
.bc-link:hover{text-decoration:underline;}
.bc-sep{color:var(--outline);margin:0 0.4rem;flex-shrink:0;}
.bc-current{color:var(--on-surface-variant);font-weight:400;word-break:break-word;}

/* ========== RELATED POSTS ========== */
.related-posts{margin-top:2.5rem;padding-top:2rem;border-top:1px solid var(--outline-variant);}
.related-heading{font-family:var(--font-display);font-size:1.1rem;font-weight:600;margin-bottom:1rem;}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0.75rem;}
.related-card{display:block;padding:1.25rem;border:1px solid var(--outline-variant);border-radius:var(--radius-md);transition:all 0.3s var(--ease-spring);text-decoration:none;color:inherit;}
.related-card:hover{border-color:var(--primary);box-shadow:0 2px 8px var(--shadow);transform:translateY(-2px);}
.related-cat{font-size:0.62rem;font-weight:600;color:var(--primary);background:var(--primary-container);padding:0.15rem 0.5rem;border-radius:var(--radius-full);display:inline-block;margin-bottom:0.4rem;}
.related-card h4{font-family:var(--font-display);font-size:0.88rem;font-weight:600;line-height:1.35;}
/* Contextual links */
.ctx-link{color:var(--primary);text-decoration:underline;text-decoration-color:var(--primary-container);text-underline-offset:2px;transition:text-decoration-color 0.2s;}
.ctx-link:hover{text-decoration-color:var(--primary);}
/* Glossary nav */
.glossary-nav{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--outline-variant);}
.glossary-nav-links{display:flex;gap:0.5rem;flex-wrap:wrap;}

/* ========== FOOTER SITEMAP ========== */
.footer-sitemap{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;padding:2rem 0 1.5rem;border-bottom:1px solid var(--outline-variant);margin-bottom:1.5rem;}
.footer-col{display:flex;flex-direction:column;gap:0.35rem;}
.footer-col-title{font-size:0.72rem;font-weight:600;color:var(--on-surface);margin-bottom:0.25rem;text-transform:uppercase;letter-spacing:0.05em;}
.footer-col a{font-size:0.72rem;color:var(--outline);text-decoration:none;transition:color 0.2s;}
.footer-col a:hover{color:var(--primary);}


/* ============================================================
   RESPONSIVE — TABLET (max-width: 768px)
   ============================================================ */
@media(max-width:768px){
  .section{padding:3.5rem 0;}
  .s-head{margin-bottom:2rem;}

  /* Post pages */
  .post-page{padding-top:4.5rem;}
  .post-header{margin-bottom:1.75rem;}
  .post-body h2{font-size:1.2rem;margin:1.5rem 0 .6rem;}
  .post-body h3{font-size:1.05rem;}
  .post-body blockquote{padding:.6rem 1rem;margin:1.25rem 0;}
  .post-author{padding:1.25rem;gap:.75rem;}

  /* Related grid */
  .related-grid{grid-template-columns:1fr;}
  .related-card{padding:1rem;}

  /* Footer sitemap */
  .footer-sitemap{grid-template-columns:1fr 1fr;gap:1.5rem;}

  /* Breadcrumbs */
  .breadcrumbs{font-size:0.7rem;padding:0.5rem 0;}
}


/* ============================================================
   RESPONSIVE — MOBILE (max-width: 600px)
   ============================================================ */
@media(max-width:600px){
  .section{padding:2.75rem 0;}
  .s-head{margin-bottom:1.5rem;}
  .s-title{margin-bottom:.4rem;}

  /* Buttons — better tap targets */
  .btn-filled,.btn-tonal,.btn-outline{
    font-size:.82rem;padding:.7rem 1.35rem;
    justify-content:center;
  }

  /* Post pages */
  .post-page{padding-top:3.5rem;padding-bottom:2.5rem;}
  .post-title{font-size:clamp(1.35rem,5vw,1.8rem);}
  .post-back{margin-bottom:1rem;font-size:.78rem;}
  .post-body p{font-size:.9rem;line-height:1.7;}
  .post-body li{font-size:.88rem;}
  .post-author{flex-direction:column;text-align:center;padding:1.25rem 1rem;}
  .post-author-avatar{margin:0 auto;}
  .post-nav{flex-direction:column;}
  .post-nav-link{justify-content:center;}

  /* Footer sitemap */
  .footer-sitemap{grid-template-columns:1fr 1fr;gap:1.25rem;padding:1.5rem 0 1rem;}
  footer .container{flex-direction:column;align-items:center;text-align:center;gap:.25rem;}
}


/* ============================================================
   RESPONSIVE — SMALL MOBILE (max-width: 400px)
   ============================================================ */
@media(max-width:400px){
  .container{padding:0 1rem;}
  .section{padding:2.25rem 0;}

  /* Buttons stack full width */
  .btn-filled,.btn-tonal,.btn-outline{
    width:100%;font-size:.8rem;padding:.65rem 1.15rem;
  }

  .post-title{font-size:1.25rem;}
  .post-body p{font-size:.88rem;}
  .post-body blockquote{font-size:.88rem;padding:.5rem .85rem;}

  .breadcrumbs{font-size:0.65rem;}
  .bc-sep{margin:0 0.25rem;}

  /* Footer single column */
  .footer-sitemap{grid-template-columns:1fr;gap:1.25rem;}
}


/* ============================================================
   SAFE AREA INSETS (notched phones — iPhone X+, etc.)
   ============================================================ */
@supports(padding:env(safe-area-inset-bottom)){
  body{
    padding-left:env(safe-area-inset-left);
    padding-right:env(safe-area-inset-right);
  }
  nav{
    padding-left:env(safe-area-inset-left);
    padding-right:env(safe-area-inset-right);
  }
  footer{
    padding-bottom:calc(1.75rem + env(safe-area-inset-bottom));
  }
}