/*
Theme Name: Signal & Ledger
Theme URI: https://rajarshi-ray.com
Author: Built for Rajarshi Ray
Author URI: https://rajarshi-ray.com
Description: A professional portfolio theme for Rajarshi Ray — Technology Leader in AI, Machine Learning, Data Science and Financial Crime Compliance. Frames his career as a "case file": entity resolution, signal detection and a career ledger of Tier-1 bank engagements across geographies.
Version: 1.0
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: signal-ledger
*/

/* ==========================================================================
   0. DESIGN TOKENS
   ========================================================================== */
:root{
  --ink-900:#0B1524;
  --ink-800:#101E33;
  --ink-700:#182C47;
  --ink-600:#26415F;
  --paper-050:#EEF1EF;
  --paper-100:#E3E8E3;
  --paper-200:#CBD3CC;
  --gold-500:#C6A15B;
  --gold-600:#AD8842;
  --teal-500:#2E9C93;
  --teal-600:#24817A;
  --white:#FCFCFA;
  --text-on-dark:#EAEDEE;
  --text-on-dark-muted:#93A2B4;
  --text-on-light:#101E33;
  --text-on-light-muted:#54626F;
  --line-dark:rgba(234,237,238,0.12);
  --line-light:rgba(16,30,51,0.12);
  --radius-sm:2px;
  --radius-md:4px;
  --font-display:'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body:'IBM Plex Sans', -apple-system, Helvetica, Arial, sans-serif;
  --font-mono:'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  --max-width:1180px;
}

/* ==========================================================================
   1. RESET & BASE
   ========================================================================== */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper-050);
  color:var(--text-on-light);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;line-height:1.15;font-weight:600;}
p{margin:0 0 1.1em;}
.wrap{max-width:var(--max-width);margin:0 auto;padding:0 32px;}
:focus-visible{outline:2px solid var(--gold-500);outline-offset:3px;}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}

/* eyebrow / case-file label device — used throughout because Rajarshi's
   actual domain is Enterprise Case Management, so every section is framed
   as a case entry in his professional ledger */
.case-id{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gold-600);
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
}
.case-id::before{content:'';width:7px;height:7px;border-radius:50%;background:var(--teal-500);box-shadow:0 0 0 3px rgba(46,156,147,.18);}
.case-id.on-dark{color:var(--gold-500);}

/* ==========================================================================
   2. HEADER / NAV
   ========================================================================== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(11,21,36,.92);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;}
.brand{display:flex;align-items:center;gap:12px;color:var(--text-on-dark);}
.brand-mark{
  width:36px;height:36px;border:1px solid var(--gold-500);border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:13px;color:var(--gold-500);letter-spacing:.02em;
}
.brand-name{font-family:var(--font-display);font-size:19px;font-weight:600;}
.brand-role{display:block;font-family:var(--font-mono);font-size:11px;color:var(--text-on-dark-muted);letter-spacing:.06em;text-transform:uppercase;margin-top:2px;}
.main-nav ul{display:flex;gap:2px;align-items:center;}
.main-nav a{
  display:inline-block;padding:10px 16px;font-size:14.5px;color:var(--text-on-dark-muted);
  border-radius:var(--radius-sm);transition:color .15s ease, background .15s ease;
}
.main-nav a:hover,.main-nav a.is-active{color:var(--white);background:rgba(255,255,255,.06);}
.nav-toggle{display:none;background:none;border:1px solid var(--line-dark);color:var(--text-on-dark);width:42px;height:42px;border-radius:var(--radius-sm);font-size:18px;}

@media (max-width:860px){
  .nav-toggle{display:block;}
  .main-nav{position:absolute;top:76px;left:0;right:0;background:var(--ink-900);border-bottom:1px solid var(--line-dark);display:none;}
  .main-nav.is-open{display:block;}
  .main-nav ul{flex-direction:column;padding:8px 24px 20px;gap:0;align-items:stretch;}
  .main-nav a{padding:12px 4px;border-bottom:1px solid var(--line-dark);border-radius:0;}
}

/* ==========================================================================
   3. HERO
   ========================================================================== */
.hero{
  background:radial-gradient(circle at 78% 20%, var(--ink-700) 0%, var(--ink-900) 55%);
  color:var(--text-on-dark);
  padding:96px 0 84px;
  position:relative;overflow:hidden;
}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;}
.hero h1{font-size:clamp(34px,4.4vw,58px);letter-spacing:-.01em;color:var(--white);}
.hero h1 em{font-style:italic;color:var(--gold-500);}
.hero-sub{font-size:18px;color:var(--text-on-dark-muted);max-width:52ch;margin-bottom:28px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:13px 24px;font-size:14.5px;font-weight:500;
  border-radius:var(--radius-sm);border:1px solid transparent;transition:transform .15s ease, background .15s ease, border-color .15s ease;
  font-family:var(--font-body);
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--gold-500);color:var(--ink-900);}
.btn-primary:hover{background:var(--gold-600);}
.btn-ghost{border-color:var(--line-dark);color:var(--text-on-dark);}
.btn-ghost:hover{border-color:var(--text-on-dark-muted);}
.btn-dark{border-color:var(--line-light);color:var(--text-on-light);}
.btn-dark:hover{border-color:var(--ink-700);}

.hero-graph{position:relative;height:380px;}
.hero-graph svg{width:100%;height:100%;}
.hero-graph .node-label{font-family:var(--font-mono);font-size:10.5px;fill:var(--text-on-dark-muted);letter-spacing:.04em;}
.hero-graph .node-core{fill:var(--gold-500);}
.hero-graph .node-dot{fill:var(--teal-500);}
.hero-graph .edge{stroke:var(--line-dark);stroke-width:1;}
.hero-graph .edge.active{stroke:var(--teal-500);stroke-opacity:.55;}

@media (max-width:900px){
  .hero .wrap{grid-template-columns:1fr;}
  .hero-graph{height:280px;order:-1;}
}

/* ==========================================================================
   4. STAT STRIP
   ========================================================================== */
.stat-strip{background:var(--ink-800);border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);}
.stat-strip .wrap{display:grid;grid-template-columns:repeat(4,1fr);}
.stat{padding:30px 24px;border-left:1px solid var(--line-dark);}
.stat:first-child{border-left:none;}
.stat .num{font-family:var(--font-display);font-size:32px;color:var(--gold-500);display:block;}
.stat .label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--text-on-dark-muted);}
@media (max-width:760px){.stat-strip .wrap{grid-template-columns:repeat(2,1fr);} .stat:nth-child(3){border-left:none;}}

/* ==========================================================================
   5. SECTION SCAFFOLDING
   ========================================================================== */
.section{padding:88px 0;}
.section-light{background:var(--paper-050);}
.section-paper{background:var(--white);border-top:1px solid var(--line-light);border-bottom:1px solid var(--line-light);}
.section-dark{background:var(--ink-900);color:var(--text-on-dark);}
.section-head{max-width:640px;margin-bottom:48px;}
.section-head h2{font-size:clamp(26px,3vw,36px);}
.section-dark .section-head h2{color:var(--white);}
.section-head p{color:var(--text-on-light-muted);font-size:16px;}
.section-dark .section-head p{color:var(--text-on-dark-muted);}

/* ==========================================================================
   6. BIO / ABOUT INTRO
   ========================================================================== */
.bio-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:start;}
.bio-grid .lede{font-family:var(--font-display);font-size:24px;line-height:1.4;color:var(--text-on-light);}
.bio-grid .lede em{font-style:italic;color:var(--teal-600);}
.bio-copy p{color:var(--text-on-light-muted);}
@media (max-width:860px){.bio-grid{grid-template-columns:1fr;}}

/* ==========================================================================
   7. EXPERTISE / CASE CARDS
   ========================================================================== */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line-light);border:1px solid var(--line-light);}
.card{background:var(--white);padding:34px 30px;}
.card h3{font-size:19px;}
.card p{color:var(--text-on-light-muted);font-size:15px;margin-bottom:0;}
.card .num-mark{font-family:var(--font-mono);font-size:12px;color:var(--gold-600);letter-spacing:.08em;}
@media (max-width:860px){.card-grid{grid-template-columns:1fr;}}

/* tag chips for technology expertise */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  font-family:var(--font-mono);font-size:13px;padding:9px 14px;border:1px solid var(--line-light);
  border-radius:var(--radius-sm);color:var(--text-on-light);background:var(--white);
}
.section-dark .tag{border-color:var(--line-dark);background:transparent;color:var(--text-on-dark);}

/* ==========================================================================
   8. EXPERIENCE LEDGER (timeline)
   ========================================================================== */
.ledger{border-top:1px solid var(--line-light);}
.ledger-entry{border-bottom:1px solid var(--line-light);padding:36px 0;display:grid;grid-template-columns:220px 1fr;gap:32px;}
.ledger-entry .when{font-family:var(--font-mono);font-size:13px;color:var(--gold-600);letter-spacing:.03em;}
.ledger-entry .role{font-family:var(--font-display);font-size:22px;margin:6px 0 2px;}
.ledger-entry .org{color:var(--text-on-light-muted);font-size:14.5px;margin-bottom:14px;}
.ledger-entry ul{margin-top:10px;}
.ledger-entry li{position:relative;padding-left:20px;color:var(--text-on-light-muted);font-size:15.5px;margin-bottom:10px;}
.ledger-entry li::before{content:'—';position:absolute;left:0;color:var(--teal-500);}
@media (max-width:760px){.ledger-entry{grid-template-columns:1fr;gap:8px;}}

/* engagements sub-list, styled like ledger line items */
.engagement-list{margin-top:18px;border:1px solid var(--line-light);}
.engagement-list li{
  display:grid;grid-template-columns:110px 1fr;gap:18px;padding:14px 18px;
  border-bottom:1px solid var(--line-light);font-size:14.5px;color:var(--text-on-light-muted);padding-left:18px !important;
}
.engagement-list li::before{display:none;}
.engagement-list li:last-child{border-bottom:none;}
.engagement-list .geo{font-family:var(--font-mono);font-size:12px;color:var(--teal-600);letter-spacing:.05em;text-transform:uppercase;}

/* ==========================================================================
   9. ACCOMPLISHMENTS / CERTS
   ========================================================================== */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:56px;}
.list-check li{padding-left:26px;position:relative;margin-bottom:14px;color:var(--text-on-dark-muted);font-size:15px;}
.list-check li::before{content:'◆';position:absolute;left:0;color:var(--gold-500);font-size:11px;top:4px;}
@media (max-width:860px){.two-col{grid-template-columns:1fr;}}

/* ==========================================================================
   10. BLOG / POSTS
   ========================================================================== */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.post-card{border:1px solid var(--line-light);background:var(--white);padding:26px;display:flex;flex-direction:column;gap:10px;}
.post-card .date{font-family:var(--font-mono);font-size:11.5px;color:var(--teal-600);letter-spacing:.06em;text-transform:uppercase;}
.post-card h3{font-size:18px;}
.post-card a.stretched{color:inherit;}
.post-card p{color:var(--text-on-light-muted);font-size:14.5px;margin-bottom:0;}
@media (max-width:900px){.post-grid{grid-template-columns:1fr;}}

.entry-content{font-size:17px;color:var(--text-on-light-muted);}
.entry-content h2,.entry-content h3{color:var(--text-on-light);margin-top:1.4em;}
.entry-content img{border:1px solid var(--line-light);margin:22px 0;}
.entry-header{padding:64px 0 20px;border-bottom:1px solid var(--line-light);}
.entry-header .date{font-family:var(--font-mono);font-size:12px;color:var(--gold-600);text-transform:uppercase;letter-spacing:.06em;}
.entry-header h1{font-size:clamp(28px,4vw,42px);margin-top:10px;}
.pagination{display:flex;justify-content:space-between;margin-top:40px;font-family:var(--font-mono);font-size:13px;}

/* ==========================================================================
   11. CONTACT
   ========================================================================== */
.contact-panel{
  background:var(--ink-900);color:var(--text-on-dark);padding:70px 56px;
  display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;border-radius:var(--radius-md);
}
.contact-panel h2{color:var(--white);font-size:30px;}
.contact-panel p{color:var(--text-on-dark-muted);margin-bottom:0;}
.contact-form{max-width:640px;margin:0 auto;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px;}
.form-row.full{grid-template-columns:1fr;}
.form-row label{display:block;font-family:var(--font-mono);font-size:11.5px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;color:var(--text-on-light-muted);}
.form-row input,.form-row textarea{
  width:100%;padding:13px 14px;border:1px solid var(--line-light);background:var(--white);
  font-family:var(--font-body);font-size:15px;border-radius:var(--radius-sm);
}
.form-row input:focus,.form-row textarea:focus{border-color:var(--teal-500);}
@media (max-width:700px){.form-row{grid-template-columns:1fr;} .contact-panel{grid-template-columns:1fr;padding:44px 26px;}}

/* ==========================================================================
   12. FOOTER
   ========================================================================== */
.site-footer{background:var(--ink-900);color:var(--text-on-dark-muted);padding:52px 0 36px;}
.footer-grid{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:24px;border-bottom:1px solid var(--line-dark);padding-bottom:32px;margin-bottom:24px;}
.footer-brand{font-family:var(--font-display);color:var(--white);font-size:20px;}
.footer-nav ul{display:flex;gap:22px;flex-wrap:wrap;}
.footer-nav a{font-size:14px;}
.footer-nav a:hover{color:var(--white);}
.footer-meta{display:flex;justify-content:space-between;font-size:13px;flex-wrap:wrap;gap:10px;}

/* utility */
.mt-0{margin-top:0;}
.center{text-align:center;}