/*
Theme Name:   eStudyUniverse Blog
Theme URI:    https://blog.estudyuniverse.com
Description:  Astra child theme for blog.estudyuniverse.com. Card-grid archive, category
              pill filter, image-free CSS thumbnails, and an author box built for E-E-A-T.
              Brand tokens live in the :root block below — see BLOG-REDESIGN.md §5.
Author:       eStudyUniverse
Template:     astra
Version:      1.0.0
Text Domain:  estudyuniverse-blog
*/

/* ==========================================================================
   1. BRAND TOKENS — edit colours here and nowhere else.
   Every colour on the blog resolves from this block.
   ========================================================================== */

:root{
  --esu-blue:#135bec;        /* Primary. Links, active pill, footer, buttons.   */
  --esu-blue-dark:#0d47a1;   /* Hover states.                                   */
  --esu-blue-tint:#ecf3ff;   /* Tinted bands, avatar backgrounds.               */
  --esu-amber:#F59E0B;       /* RESERVED: app-download CTAs ONLY. Never emphasis.*/
  --esu-ink:#101622;         /* Dark nav bar, app CTA card.                     */
  --esu-ground:#f6f6f8;      /* Page background.                                */
  --esu-surface:#ffffff;     /* Card background.                               */
  --esu-text:#111827;        /* Headings and body.                             */
  --esu-muted:#6b7280;       /* Captions, metadata, timestamps.                */
  --esu-line:#e3e6ee;        /* Borders and rules.                             */

  --esu-display:Poppins,-apple-system,"Segoe UI",sans-serif;
  --esu-body:Inter,-apple-system,"Segoe UI",sans-serif;
  --esu-mono:"JetBrains Mono",ui-monospace,monospace;
}

/* ==========================================================================
   2. LAYOUT RESET — let the archive templates run full width inside Astra.
   ========================================================================== */

.blog .ast-container,
.archive .ast-container,
.esu-single .ast-container{max-width:none;padding-left:0;padding-right:0}

.blog #content,
.archive #content{background:var(--esu-ground)}

.esu-wrap{width:min(1200px,calc(100% - 40px));margin-inline:auto}

.esu-main{font-family:var(--esu-body);color:var(--esu-text)}
.esu-main h1,.esu-main h2,.esu-main h3{font-family:var(--esu-display);text-wrap:balance;line-height:1.22}

/* ==========================================================================
   3. PROMO BAR — the first of exactly two amber moments.
   ========================================================================== */

.esu-promo{background:var(--esu-blue);color:#fff;font-family:var(--esu-body)}
.esu-promo .esu-wrap{display:flex;align-items:center;justify-content:center;gap:16px;
  flex-wrap:wrap;padding:9px 0;font-size:13.5px;font-weight:500}
.esu-promo strong{font-weight:600}
.esu-promo a{background:var(--esu-amber);color:#1a1205;font-weight:700;font-size:12px;
  letter-spacing:.04em;text-transform:uppercase;padding:6px 14px;border-radius:999px;
  white-space:nowrap;text-decoration:none}

/* ==========================================================================
   4. ARCHIVE HEADER
   ========================================================================== */

.esu-head{padding:44px 0 8px;text-align:center;background:var(--esu-ground)}
.esu-crumb{font-family:var(--esu-mono);font-size:11px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--esu-muted);margin-bottom:14px}
.esu-crumb a{color:var(--esu-muted);text-decoration:none}
.esu-crumb a:hover{color:var(--esu-blue)}
.esu-head h1{font-size:clamp(30px,4.4vw,44px);font-weight:700;letter-spacing:-.025em;margin:0}
.esu-head p{max-width:60ch;margin:12px auto 0;color:var(--esu-muted);font-size:16.5px;line-height:1.6}

/* ==========================================================================
   5. CATEGORY PILLS
   ========================================================================== */

.esu-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;padding:26px 0 34px;
  background:var(--esu-ground);list-style:none;margin:0}
.esu-pills li{margin:0}
.esu-pills a{display:inline-block;font-size:13px;font-weight:500;padding:7px 15px;
  border-radius:999px;border:1px solid var(--esu-line);background:var(--esu-surface);
  color:var(--esu-muted);text-decoration:none;transition:border-color .15s,color .15s}
.esu-pills a:hover{border-color:var(--esu-blue);color:var(--esu-blue)}
.esu-pills .is-active a{background:var(--esu-blue);border-color:var(--esu-blue);
  color:#fff;font-weight:600}

/* ==========================================================================
   6. CARD GRID
   ========================================================================== */

.esu-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
  padding-bottom:12px;background:var(--esu-ground)}
@media(max-width:980px){.esu-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.esu-grid{grid-template-columns:1fr}}

.esu-card{background:var(--esu-surface);border:1px solid var(--esu-line);border-radius:12px;
  overflow:hidden;display:flex;flex-direction:column;
  transition:transform .18s ease,box-shadow .18s ease}
.esu-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(16,22,34,.11)}
@media(prefers-reduced-motion:reduce){
  .esu-card,.esu-card:hover{transition:none;transform:none}
}

/* --- CSS-only branded thumbnail. No image bytes. See BLOG-REDESIGN.md §3.3 --- */
.esu-thumb{position:relative;aspect-ratio:16/10;padding:22px 20px;display:flex;
  flex-direction:column;justify-content:space-between;color:#fff;overflow:hidden;
  text-decoration:none}
.esu-thumb-title{font-family:var(--esu-display);font-size:20px;font-weight:700;
  letter-spacing:-.02em;line-height:1.22;color:#fff}
.esu-thumb::after{content:"";position:absolute;right:-46px;top:-46px;width:110px;height:110px;
  background:rgba(255,255,255,.07);transform:rotate(45deg)}
.t-blue{background:linear-gradient(145deg,#1b63f0,#0d47a1)}
.t-ink{background:linear-gradient(145deg,#1d2740,#101622)}
.t-deep{background:linear-gradient(145deg,#0d47a1,#062a63)}
.t-tint{background:linear-gradient(145deg,#dfeaff,#c3d8ff)}
.t-tint .esu-thumb-title{color:#0d2b63}
.t-tint::after{background:rgba(13,43,99,.07)}
.esu-chip{font-family:var(--esu-mono);font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;
  font-weight:500;background:rgba(255,255,255,.16);padding:4px 9px;border-radius:5px;
  align-self:flex-start;color:#fff}
.t-tint .esu-chip{background:rgba(13,43,99,.12);color:#0d2b63}

/* --- card body --- */
.esu-card .esu-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:9px;flex:1}
.esu-meta{font-family:var(--esu-mono);font-size:10px;letter-spacing:.09em;text-transform:uppercase;
  color:var(--esu-blue);font-weight:500;display:flex;gap:10px;align-items:center}
.esu-meta a{color:var(--esu-blue);text-decoration:none}
.esu-meta .esu-dot{color:var(--esu-muted);opacity:.5}
.esu-meta .esu-time{color:var(--esu-muted)}
.esu-card .esu-body h2{font-size:17px;font-weight:600;letter-spacing:-.015em;margin:0}
.esu-card .esu-body h2 a{color:var(--esu-text);text-decoration:none}
.esu-card .esu-body h2 a:hover{color:var(--esu-blue)}
.esu-card .esu-body p{margin:0;font-size:14px;color:var(--esu-muted);line-height:1.55}

/* --- byline --- */
.esu-by{display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:14px;
  border-top:1px solid var(--esu-line)}
.esu-av{width:32px;height:32px;border-radius:50%;flex:none;display:grid;place-items:center;
  background:var(--esu-blue-tint);color:var(--esu-blue-dark);font-family:var(--esu-display);
  font-weight:700;font-size:11.5px;overflow:hidden}
.esu-av img{width:100%;height:100%;border-radius:50%;display:block}
.esu-by div{min-width:0}
.esu-by b{display:block;font-size:12.5px;font-weight:600}
.esu-by small{display:block;font-size:11px;color:var(--esu-muted)}
.esu-by time{margin-left:auto;font-size:11px;color:var(--esu-muted);
  font-variant-numeric:tabular-nums;white-space:nowrap}

/* ==========================================================================
   7. APP CTA CARD — the second and final amber moment.
   ========================================================================== */

.esu-appcta{background:var(--esu-ink);border:1px solid var(--esu-ink);border-radius:12px;
  padding:26px 22px;display:flex;flex-direction:column;gap:12px;justify-content:center;color:#fff}
.esu-appcta .esu-k{font-family:var(--esu-mono);font-size:10px;letter-spacing:.11em;
  text-transform:uppercase;color:var(--esu-amber)}
.esu-appcta h2{font-size:21px;font-weight:700;letter-spacing:-.02em;margin:0;color:#fff}
.esu-appcta p{margin:0;font-size:13.5px;color:#aeb8cc;line-height:1.55}
.esu-appcta a{background:var(--esu-amber);color:#1a1205;font-weight:700;font-size:13.5px;
  padding:11px 18px;border-radius:8px;text-align:center;margin-top:4px;text-decoration:none}

/* ==========================================================================
   8. PAGINATION
   ========================================================================== */

.esu-main .ast-pagination{padding:34px 0 60px;background:var(--esu-ground)}
.esu-main .ast-pagination .page-numbers{font-family:var(--esu-body);font-size:13.5px;
  font-weight:600;color:var(--esu-text);padding:9px 15px;border-radius:8px}
.esu-main .ast-pagination .page-numbers.current{background:var(--esu-blue);color:#fff}

/* ==========================================================================
   9. SINGLE ARTICLE — answer-first, 50–75 character measure.
   ========================================================================== */

.esu-article{background:var(--esu-ground);padding-bottom:60px}
.esu-article .esu-hero{background:var(--esu-surface);border-bottom:1px solid var(--esu-line);
  padding:40px 0 34px;text-align:center}
.esu-article .esu-hero h1{font-size:clamp(28px,4vw,42px);font-weight:700;
  letter-spacing:-.025em;max-width:22ch;margin:0 auto}
.esu-article .esu-standfirst{max-width:62ch;margin:16px auto 0;font-size:18px;
  color:var(--esu-muted);line-height:1.6}

.esu-content{width:min(72ch,calc(100% - 40px));margin:34px auto 0;font-size:17px;line-height:1.75}
.esu-content > h2{font-size:26px;font-weight:600;margin:38px 0 12px;letter-spacing:-.02em}
.esu-content > h3{font-size:20px;font-weight:600;margin:28px 0 10px}
.esu-content p{margin:0 0 18px}
.esu-content a{color:var(--esu-blue);text-decoration:underline;text-underline-offset:2px}
.esu-content img{max-width:100%;height:auto;border-radius:10px}
.esu-content ul,.esu-content ol{margin:0 0 18px;padding-left:22px}
.esu-content li{margin-bottom:7px}
.esu-content blockquote{margin:24px 0;padding:4px 0 4px 20px;
  border-left:3px solid var(--esu-blue);color:var(--esu-text);font-size:18px}
.esu-content table{width:100%;border-collapse:collapse;font-size:15px}
.esu-content .esu-scroll{overflow-x:auto;margin:0 0 18px}
.esu-content th,.esu-content td{border:1px solid var(--esu-line);padding:9px 12px;text-align:left}
.esu-content th{background:var(--esu-blue-tint);font-weight:600}

/* --- author box: carries sameAs. See BLOG-REDESIGN.md §2 --- */
.esu-authorbox{width:min(72ch,calc(100% - 40px));margin:44px auto 0;background:var(--esu-surface);
  border:1px solid var(--esu-line);border-radius:12px;padding:22px;display:flex;gap:16px}
.esu-authorbox .esu-av{width:56px;height:56px;font-size:17px}
.esu-authorbox h2{font-size:17px;font-weight:600;margin:0}
.esu-authorbox .esu-role{font-family:var(--esu-mono);font-size:10.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--esu-muted);margin:3px 0 8px}
.esu-authorbox p{margin:0;font-size:14.5px;color:var(--esu-muted);line-height:1.6}
.esu-sameas{display:flex;gap:12px;margin-top:10px;flex-wrap:wrap}
.esu-sameas a{font-size:12.5px;font-weight:600;color:var(--esu-blue);text-decoration:none}
.esu-sameas a:hover{text-decoration:underline}

/* ==========================================================================
   10. FOOTER
   ========================================================================== */

.esu-footer{background:var(--esu-blue);color:#fff;padding:44px 0 30px;font-family:var(--esu-body)}
.esu-fgrid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:32px}
@media(max-width:820px){.esu-fgrid{grid-template-columns:1fr 1fr}}
.esu-footer h4{font-size:12px;letter-spacing:.09em;text-transform:uppercase;
  font-family:var(--esu-mono);font-weight:500;color:#c5d8ff;margin:0 0 12px}
.esu-footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;
  gap:8px;font-size:13.5px}
.esu-footer ul a{color:#eaf1ff;text-decoration:none}
.esu-footer ul a:hover{text-decoration:underline}
.esu-fbot{margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.18);
  font-size:12px;color:#c5d8ff;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}

/* ==========================================================================
   11. ACCESSIBILITY
   ========================================================================== */

.esu-main a:focus-visible,.esu-promo a:focus-visible,.esu-footer a:focus-visible{
  outline:2px solid var(--esu-amber);outline-offset:3px;border-radius:4px}
.esu-sronly{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}