/* Renuka Balasubramaniam, executive site
   Palette: ink (hero, text), paper (cool slate, not cream), mist (rules),
   teal (the platform layers), copper (one eyebrow accent).
   Type: Bricolage Grotesque for display, Source Serif 4 for reading,
   IBM Plex Mono for figures and labels. */

:root {
  --ink: #0F1B2D;
  --ink-2: #1B2A40;
  --paper: #EEF2F5;
  --paper-2: #FFFFFF;
  --mist: #D3DBE3;
  --body: #3B4756;
  --muted: #6B7A8C;
  --teal: #0E8C7F;
  --teal-bright: #22B7A6;
  --copper: #B8612A;

  --display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --gutter: clamp(16px, 5vw, 72px);
  --measure: 62ch;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-optical-sizing: auto;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--teal-bright); outline-offset: 3px; }

h1, h2, h3 {
  font-family: var(--display);
  color: var(--ink);
  margin: 0;
  line-height: 1.05;
  letter-spacing: -0.015em;
  font-weight: 600;
}
h2 { font-size: clamp(1.6rem, 1.1rem + 2vw, 2.5rem); max-width: 26ch; }
h3 { font-size: 1.35rem; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
  margin: 0 0 0.9rem;
}

.skip {
  position: absolute; left: -999px; top: 8px;
  background: var(--teal-bright); color: var(--ink); padding: 8px 12px; z-index: 10;
}
.skip:focus { left: 8px; }

/* ---------- Hero ---------- */
.hero {
  background: var(--ink);
  color: var(--paper);
  padding: 0 var(--gutter) clamp(48px, 8vw, 96px);
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 22px 0;
  border-bottom: 1px solid rgba(238, 242, 245, 0.12);
}
.wordmark {
  font-family: var(--display); font-weight: 700; color: var(--paper);
  text-decoration: none; font-size: 1rem; letter-spacing: 0.01em;
}
.topbar ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 22px; }
.topbar a:not(.wordmark) {
  font-family: var(--mono); font-size: 0.8rem; color: #B8C4D4; text-decoration: none;
}
.topbar a:not(.wordmark):hover { color: var(--teal-bright); }
@media (max-width: 640px) { .topbar ul { display: none; } }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: center;
  padding-top: clamp(48px, 8vw, 104px);
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

.hero .eyebrow { color: var(--teal-bright); }
.hero h1 {
  color: var(--paper);
  font-size: clamp(2.2rem, 1.2rem + 4.2vw, 4.4rem);
  font-weight: 600;
  max-width: 14ch;
}
.hero h1 em { font-style: normal; color: var(--teal-bright); }
.lede {
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem);
  color: #C9D3DF;
  max-width: 46ch;
  margin-top: 1.4rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.8rem; }
.button {
  font-family: var(--display); font-weight: 600; font-size: 0.95rem;
  background: var(--teal-bright); color: var(--ink);
  padding: 12px 20px; border-radius: 4px; text-decoration: none;
  border: 1.5px solid var(--teal-bright);
}
.button:hover { background: var(--paper); border-color: var(--paper); color: var(--ink); }
.button.ghost { background: transparent; color: var(--paper); border-color: rgba(238,242,245,0.35); }
.button.ghost:hover { border-color: var(--paper); background: transparent; color: var(--paper); }
.meta { font-family: var(--mono); font-size: 0.8rem; color: #8A9AB2; margin-top: 1.4rem; }

/* The signature: the AI Foundations platform, drawn as the stack it is.
   Layers are listed top to bottom (experience first), the way a person meets it. */
.stack {
  margin: 0;
  background: var(--ink-2);
  border: 1px solid rgba(238,242,245,0.1);
  border-radius: 8px;
  padding: 20px 20px 18px;
}
.stack figcaption { display: flex; flex-direction: column; gap: 4px; margin-bottom: 16px; }
.stack .label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: #8A9AB2; }
.stack .title { font-family: var(--display); font-weight: 600; color: var(--paper); font-size: 1.05rem; }
.stack-grid { display: grid; grid-template-columns: minmax(0, 1fr) 7.5rem; gap: 10px; align-items: stretch; }
.layers { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.layer {
  position: relative;
  border-radius: 5px;
  padding: 12px 14px 12px 16px;
  border-left: 4px solid var(--teal-bright);
  background: rgba(34,183,166,0.10);
  display: grid; gap: 3px;
}
.js .stack .layer { opacity: 0; transform: translateY(8px); }  /* the load animation brings them in; without JS they just show */
.js .rail { opacity: 0; }
.layer-exp   { background: rgba(34,183,166,0.22); }
.layer-agent { background: rgba(34,183,166,0.15); }
.layer-data  { background: rgba(34,183,166,0.10); border-left-color: rgba(34,183,166,0.75); }
.layer-cloud { background: rgba(34,183,166,0.06); border-left-color: rgba(34,183,166,0.55); }
.layer-name { font-family: var(--display); font-weight: 600; color: var(--paper); font-size: 0.98rem; line-height: 1.2; }
.layer-desc { font-size: 0.86rem; color: #C9D3DF; line-height: 1.4; }
.layer-fig  { font-family: var(--mono); font-size: 0.74rem; color: #B8C4D4; line-height: 1.5; margin-top: 4px; }
.layer-fig strong { color: var(--teal-bright); font-weight: 500; font-size: 0.95rem; }
.rails { display: grid; gap: 6px; }
.rail {
  border: 1px dashed rgba(238,242,245,0.28);
  border-radius: 5px; padding: 10px 10px;
  font-size: 0.74rem; line-height: 1.4; color: #B8C4D4;
  display: flex; flex-direction: column; gap: 4px; justify-content: center;
}
.rail-name { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--copper); }
.stack-note { font-family: var(--mono); font-size: 0.74rem; color: #8A9AB2; margin-top: 12px; line-height: 1.5; }
/* Load sequence: layers rise from the bottom, then the rails appear. */
.stack.drawn .layer-cloud { animation: rise .55s ease .15s forwards; }
.stack.drawn .layer-data  { animation: rise .55s ease .40s forwards; }
.stack.drawn .layer-agent { animation: rise .55s ease .65s forwards; }
.stack.drawn .layer-exp   { animation: rise .55s ease .90s forwards; }
.stack.drawn .rail        { animation: fade .6s ease 1.35s forwards; }
@keyframes rise { to { opacity: 1; transform: none; } }
@keyframes fade { to { opacity: 1; } }
@media (max-width: 520px) {
  .stack-grid { grid-template-columns: 1fr; }
  .rails { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 360px) { .rails { grid-template-columns: 1fr; } }

/* ---------- Ledger ---------- */
.ledger { background: var(--paper-2); border-bottom: 1px solid var(--mist); }
.ledger dl {
  margin: 0; padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}
.ledger dl > div {
  padding: 26px 20px 26px 0;
  border-right: 1px solid var(--mist);
  margin-right: 20px;
  display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 6px;
}
.ledger dl > div:last-child { border-right: 0; }
.ledger dd { margin: 0; font-family: var(--mono); font-size: clamp(1.6rem, 1.3rem + 1vw, 2.2rem); color: var(--ink); font-weight: 500; letter-spacing: -0.02em; }
.ledger dt { font-size: 0.86rem; color: var(--muted); line-height: 1.4; }
@media (max-width: 640px) {
  .ledger dl { grid-template-columns: 1fr 1fr; }
  .ledger dl > div { border-right: 0; border-bottom: 1px solid var(--mist); margin-right: 0; padding: 18px 12px 18px 0; }
}

/* ---------- Sections ---------- */
main > section { padding: clamp(56px, 9vw, 120px) var(--gutter); }
main > section + section { border-top: 1px solid var(--mist); }
.section-head { margin-bottom: clamp(32px, 5vw, 56px); }

/* Pillars: the three things, side by side, no numbering (they are not a sequence) */
.pillar-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 0; border-top: 1px solid var(--mist); border-bottom: 1px solid var(--mist); }
.pillar { padding: 28px 28px 28px 0; border-right: 1px solid var(--mist); margin-right: 28px; }
.pillar:last-child { border-right: 0; margin-right: 0; }
.pillar h3 { font-size: 1.35rem; margin-bottom: 10px; }
.pillar p { max-width: 38ch; }
.pillar a { font-family: var(--mono); font-size: 0.8rem; }
@media (max-width: 860px) {
  .pillar { border-right: 0; margin-right: 0; border-top: 1px solid var(--mist); padding: 22px 0; }
  .pillar:first-child { border-top: 0; }
}

/* Group titles inside the work section */
.group-title {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--teal); font-weight: 500; margin: clamp(36px, 6vw, 64px) 0 10px;
}
.group-title:first-of-type { margin-top: 0; }
.also-list { list-style: none; margin: 0; padding: 0; max-width: 70ch; display: grid; gap: 14px; }
.also-list strong { color: var(--ink); font-weight: 600; }

/* Point of view */
.pov { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(28px, 6vw, 96px); align-items: start; }
.pov .eyebrow { grid-column: 1 / -1; margin-bottom: 0; }
.pov blockquote { margin: 0; }
.pov blockquote p {
  font-family: var(--display); font-weight: 600; color: var(--ink);
  font-size: clamp(1.45rem, 1rem + 1.8vw, 2.3rem); line-height: 1.2; letter-spacing: -0.01em;
}
.pov-body { max-width: var(--measure); padding-top: 0.5rem; }
@media (max-width: 900px) { .pov { grid-template-columns: 1fr; } }

/* Cases */
.case {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: clamp(20px, 4vw, 64px);
  padding: clamp(28px, 4vw, 44px) 0;
  border-top: 1px solid var(--mist);
}
.case:last-of-type { border-bottom: 1px solid var(--mist); }
.case-head h3 { font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); }
.case-sub { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); margin-top: 8px; line-height: 1.5; }
.case-body { margin: 0; display: grid; grid-template-columns: 7rem minmax(0, 1fr); row-gap: 14px; column-gap: 20px; max-width: 70ch; }
.case-body dt { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--teal); padding-top: 4px; }
.case-body dd { margin: 0; }
@media (max-width: 800px) {
  .case { grid-template-columns: 1fr; }
  .case-body { grid-template-columns: 1fr; row-gap: 4px; }
  .case-body dd { margin-bottom: 10px; }
}

/* Capabilities */
.cap-list { margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px 40px; }
.cap-list dt { font-family: var(--display); font-weight: 600; color: var(--ink); font-size: 1.15rem; margin-bottom: 6px; }
.cap-list dd { margin: 0; font-size: 1rem; }

/* Recognition */
.recog-list { list-style: none; margin: 0; padding: 0; max-width: 78ch; }
.recog-list li { padding: 14px 0; border-top: 1px solid var(--mist); display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 16px; }
.recog-list li:last-child { border-bottom: 1px solid var(--mist); }
.recog-org { font-family: var(--mono); font-size: 0.8rem; color: var(--ink); padding-top: 3px; }
@media (max-width: 640px) { .recog-list li { grid-template-columns: 1fr; gap: 4px; } }

/* Timeline (a real sequence, so the order carries meaning) */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid; grid-template-columns: 11rem minmax(0, 1fr); gap: 24px;
  padding: 26px 0; border-top: 1px solid var(--mist); position: relative;
}
.timeline li:last-child { border-bottom: 1px solid var(--mist); }
.timeline .when { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); padding-top: 6px; }
.timeline .role { font-family: var(--mono); font-size: 0.8rem; color: var(--teal); margin: 6px 0 10px; }
.timeline p { max-width: var(--measure); }
@media (max-width: 640px) { .timeline li { grid-template-columns: 1fr; gap: 6px; } }

/* Education */
.edu-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; max-width: 80ch; }
.edu-grid h3 { font-size: 1.1rem; margin-bottom: 8px; }
.edu-grid p { margin-bottom: 4px; }

/* ---------- Contact ---------- */
.contact { background: var(--ink); color: var(--paper); padding: clamp(56px, 9vw, 120px) var(--gutter) 32px; }
.contact-grid { display: grid; grid-template-columns: minmax(0, 280px) minmax(0, 1fr); gap: clamp(28px, 6vw, 80px); align-items: center; }
.contact img { border-radius: 6px; max-width: 280px; }
.contact h2 { color: var(--paper); max-width: 22ch; }
.contact .eyebrow { color: var(--teal-bright); }
.contact-list { list-style: none; margin: 2rem 0 0; padding: 0; display: grid; gap: 12px; }
.contact-list li { display: grid; grid-template-columns: 6rem minmax(0, 1fr); gap: 12px; align-items: baseline; }
.contact-list span { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: #8A9AB2; }
.contact-list a { color: var(--teal-bright); overflow-wrap: anywhere; }
.contact-list a:hover { color: var(--paper); }
.colophon { font-family: var(--mono); font-size: 0.72rem; color: #6B7A8C; margin-top: 56px; border-top: 1px solid rgba(238,242,245,0.12); padding-top: 18px; }
@media (max-width: 760px) {
  .contact-grid { grid-template-columns: 1fr; }
  .contact img { max-width: 200px; }
  .contact-list li { grid-template-columns: 1fr; gap: 2px; }
}

/* ---------- Motion ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .js .stack .layer, .js .rail { opacity: 1; transform: none; animation: none !important; }
}
@media print {
  .hero, .contact { background: #fff; color: #000; }
  .hero h1, .contact h2 { color: #000; }
  .topbar, .hero-actions { display: none; }
}