/* ==========================================================================
   pankajanupam.com — Light Editorial
   Tokens → reset → layout → components. Light is the designed-first scheme;
   dark is a courtesy variant driven by the same tokens.
   ========================================================================== */

/* ----------------------------------------------------------- 1. Tokens */

:root {
  --paper:      #faf9f6;
  --paper-tint: #f3f1ec;
  --card:       #ffffff;
  --ink:        #1b1c21;
  --ink-soft:   #4e5158;
  --ink-faint:  #7d8087;
  --rule:       rgba(27, 28, 33, 0.14);
  --rule-soft:  rgba(27, 28, 33, 0.08);

  --navy:       #1f3864;
  --navy-deep:  #16294a;
  --warm:       #995417;
  --ok:         #17714d;

  --font-serif: "Charter", "Bitstream Charter", "Iowan Old Style", Georgia,
                Cambria, "Times New Roman", serif;
  --font-sans:  ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
                Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono:  ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --step--1: clamp(0.83rem, 0.80rem + 0.15vw, 0.91rem);
  --step-0:  clamp(1.00rem, 0.96rem + 0.20vw, 1.10rem);
  --step-1:  clamp(1.18rem, 1.10rem + 0.40vw, 1.38rem);
  --step-2:  clamp(1.45rem, 1.28rem + 0.85vw, 1.90rem);
  --step-3:  clamp(1.85rem, 1.50rem + 1.70vw, 2.75rem);
  --step-4:  clamp(2.60rem, 1.80rem + 4.00vw, 4.60rem);

  --shell:     1060px;
  --shell-pad: clamp(1.25rem, 0.8rem + 2.2vw, 2.5rem);
  --section-y: clamp(4.5rem, 3rem + 6vw, 8rem);
  --header-h:  64px;
  --ease:      cubic-bezier(0.22, 0.68, 0.32, 1);
}

:root[data-theme="dark"] {
  --paper:      #16171b;
  --paper-tint: #1c1d23;
  --card:       #202127;
  --ink:        #e9e7e2;
  --ink-soft:   #b0aeaa;
  --ink-faint:  #83817e;
  --rule:       rgba(233, 231, 226, 0.18);
  --rule-soft:  rgba(233, 231, 226, 0.09);

  --navy:       #9db4e0;
  --navy-deep:  #b9cbee;
  --warm:       #d0925a;
  --ok:         #57b98e;
}

/* ------------------------------------------------------------ 2. Reset */

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body[data-nav-open="true"] { overflow: hidden; }

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
main a, .footer a { transition: color .18s var(--ease); }
strong { font-weight: 650; }
em { font-style: italic; color: var(--navy); }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; }

:focus-visible { outline: 2px solid var(--navy); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--navy); color: var(--paper); }

.icon {
  width: 1.1em; height: 1.1em;
  fill: none; stroke: currentColor;
  stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
  flex: none;
}

.skip-link {
  position: fixed; top: 10px; left: 10px; z-index: 200;
  padding: .65rem 1rem;
  background: var(--ink); color: var(--paper);
  font-weight: 600; border-radius: 4px;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus-visible { transform: none; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

/* ----------------------------------------------------------- 3. Masthead */

.masthead {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease);
}
.masthead.is-stuck { border-bottom-color: var(--rule-soft); }

.masthead__inner {
  height: var(--header-h);
  display: flex; align-items: center; gap: 1rem;
}

.wordmark {
  font-family: var(--font-serif);
  font-size: 1.22rem; font-weight: 700; letter-spacing: -0.01em;
  margin-right: auto;
}
.wordmark span { color: var(--navy); }

.nav__list { display: flex; gap: .25rem; }
.nav__list a {
  display: block;
  padding: .45rem .75rem;
  font-size: var(--step--1);
  font-weight: 550;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.nav__list a:hover { color: var(--ink); }
.nav__list a[aria-current="true"] { color: var(--navy); border-bottom-color: var(--navy); }

.masthead__actions { display: flex; align-items: center; gap: .4rem; }

.theme-btn, .nav-toggle {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 50%;
  color: var(--ink-soft);
  transition: color .18s var(--ease), background-color .18s var(--ease);
}
.theme-btn:hover, .nav-toggle:hover { color: var(--navy); background: var(--paper-tint); }
.theme-btn .icon, .nav-toggle .icon { width: 19px; height: 19px; grid-area: 1/1; }

.icon--moon { display: none; }
:root[data-theme="dark"] .icon--sun { display: none; }
:root[data-theme="dark"] .icon--moon { display: block; }

.nav-toggle { display: none; }
.icon--close { display: none; }
[aria-expanded="true"] .icon--menu { display: none; }
[aria-expanded="true"] .icon--close { display: block; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-grid; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    max-height: calc(100dvh - var(--header-h)); overflow-y: auto;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 24px 48px rgba(27,28,33,.12);
    padding: .75rem var(--shell-pad) 1.5rem;
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  }
  body[data-nav-open="true"] .nav { opacity: 1; visibility: visible; transform: none; }
  .nav__list { flex-direction: column; }
  .nav__list a {
    font-size: var(--step-1); font-weight: 600;
    font-family: var(--font-serif);
    padding: .8rem .25rem;
    border-bottom: 1px solid var(--rule-soft);
  }
}

/* ------------------------------------------------------------- 4. Hero */

.hero { padding-block: clamp(4rem, 2.5rem + 7vw, 8.5rem) clamp(3rem, 2rem + 4vw, 5.5rem); }

.hero__kicker {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .05em;
  color: var(--ink-soft);
}
.hero__dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 18%, transparent);
}

.hero__name {
  font-size: var(--step-4);
  letter-spacing: -0.03em;
  margin-top: 1.2rem;
}

.hero__tagline {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-style: italic;
  line-height: 1.3;
  color: var(--ink-soft);
  max-width: 30ch;
  margin-top: 1rem;
}
.hero__tagline em { font-style: italic; }

.hero__intro {
  max-width: 62ch;
  margin-top: 1.6rem;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--ink-soft);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.2rem; }

/* Figures — editorial stats */
.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.6rem 2rem;
  margin: clamp(3rem, 2rem + 3vw, 4.5rem) 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}
.figure dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 1.6rem + 2vw, 3.2rem);
  font-weight: 700; letter-spacing: -0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.figure dt { font-size: var(--step--1); color: var(--ink-faint); margin-top: .15rem; }

.domains {
  margin-top: 2.4rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* --------------------------------------------------------- 5. Sections */

.section { padding-block: var(--section-y); border-top: 1px solid var(--rule); }
.section--tint { background: var(--paper-tint); }

.section__head { max-width: 64ch; margin-bottom: clamp(2.5rem, 1.8rem + 3vw, 4rem); }

.section__no {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--warm);
}
.section__no::after { content: " ———"; color: var(--rule); letter-spacing: 0; }

.section__title { font-size: var(--step-3); margin-top: .6rem; }

.section__lede {
  margin-top: 1rem;
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ----------------------------------------------------- 6. Case studies */

.study {
  display: grid;
  grid-template-columns: minmax(180px, 230px) 1fr;
  gap: clamp(1.2rem, .8rem + 2vw, 3rem);
  padding-block: clamp(2rem, 1.5rem + 2vw, 3rem);
  border-top: 1px solid var(--rule-soft);
}
.study:first-of-type { border-top: none; padding-top: 0; }

.study__meta { position: sticky; top: calc(var(--header-h) + 1.5rem); height: fit-content; }

.study__client {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.3;
}
.study__role {
  margin-top: .5rem;
  font-size: var(--step--1);
  color: var(--ink-faint);
  line-height: 1.5;
}

.study__body h3 { font-size: var(--step-2); margin-bottom: .9rem; }
.study__body p { color: var(--ink-soft); max-width: 66ch; }

.study__body ul {
  margin-top: 1.1rem;
  display: flex; flex-direction: column; gap: .65rem;
}
.study__body ul li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--ink-soft);
  max-width: 64ch;
}
.study__body ul li::before {
  content: "";
  position: absolute; left: 0; top: .68em;
  width: 6px; height: 6px;
  background: var(--warm);
  border-radius: 1px;
  transform: rotate(45deg);
}

.study__stack {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--ink-faint);
}

.study-note {
  margin-top: clamp(2rem, 1.5rem + 2vw, 3rem);
  padding: 1.4rem 1.6rem;
  border-left: 3px solid var(--warm);
  background: var(--paper-tint);
  color: var(--ink-soft);
  font-size: var(--step-0);
  max-width: 74ch;
}

@media (max-width: 760px) {
  .study { grid-template-columns: 1fr; }
  .study__meta { position: static; }
  .study__role { margin-top: .25rem; }
}

/* ----------------------------------------------------------- 7. Skills */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: 1px;
  background: var(--rule-soft);
  border-block: 1px solid var(--rule-soft);
}
.skill-block { background: var(--paper-tint); padding: 1.6rem 1.5rem 1.7rem 0; }
.section--tint .skill-block { background: var(--paper-tint); }
.skill-block h3 {
  font-size: var(--step-0);
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--navy);
  margin-bottom: .6rem;
}
.skill-block p { color: var(--ink-soft); line-height: 1.8; }

.creds {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: clamp(1.6rem, 1.2rem + 2vw, 3rem);
  margin-top: clamp(2.5rem, 2rem + 2vw, 3.5rem);
}
.creds__col h3 {
  font-family: var(--font-sans);
  font-size: var(--step--1);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--warm);
  padding-bottom: .6rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}
.creds__list { display: flex; flex-direction: column; gap: .95rem; }
.creds__list li strong { display: block; font-weight: 640; line-height: 1.4; }
.creds__list li span { font-size: var(--step--1); color: var(--ink-faint); }
.creds__list a { color: var(--navy); text-decoration: underline; text-underline-offset: 3px; }
.creds__list a:hover { color: var(--warm); }

/* ------------------------------------------------------- 8. Experience */

.cv { display: flex; flex-direction: column; }

.cv__row {
  display: grid;
  grid-template-columns: minmax(150px, 200px) 1fr;
  gap: clamp(1rem, .6rem + 2vw, 3rem);
  padding-block: 1.6rem;
  border-top: 1px solid var(--rule-soft);
}
.cv__row:first-child { border-top: none; padding-top: 0; }

.cv__when {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
  color: var(--ink-faint);
  padding-top: .3rem;
}

.cv__what h3 { font-size: var(--step-1); font-family: var(--font-sans); font-weight: 680; }
.cv__what h3 span { color: var(--navy); font-weight: 600; }
.cv__what p { margin-top: .45rem; color: var(--ink-soft); max-width: 64ch; }

@media (max-width: 640px) {
  .cv__row { grid-template-columns: 1fr; gap: .2rem; }
}

/* ----------------------------------------------------- 9. Testimonials */

.quotes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: clamp(1.2rem, .9rem + 1.5vw, 2rem);
}

.quote {
  margin: 0;
  padding: 1.8rem 1.8rem 1.6rem;
  background: var(--card);
  border: 1px solid var(--rule-soft);
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(27,28,33,.04), 0 8px 24px rgba(27,28,33,.05);
  display: flex; flex-direction: column;
}

.quote blockquote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.55;
  color: var(--ink);
  flex: 1;
}
.quote blockquote::before {
  content: "“";
  display: block;
  font-size: 2.6rem;
  line-height: .6;
  color: var(--warm);
  margin-bottom: .6rem;
}

.quote figcaption {
  margin-top: 1.2rem;
  padding-top: .9rem;
  border-top: 1px solid var(--rule-soft);
  font-size: var(--step--1);
  font-weight: 650;
  color: var(--ink-soft);
}
.quote figcaption::before { content: "— "; color: var(--warm); }

/* --------------------------------------------------------- 10. Contact */

.section--contact { border-top: 1px solid var(--rule); }

.contact { display: flex; flex-direction: column; gap: 2.2rem; align-items: flex-start; }

.contact__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: .1rem 3rem;
  width: 100%;
}
.contact__list li {
  display: flex; align-items: baseline; gap: 1rem;
  padding-block: .8rem;
  border-bottom: 1px solid var(--rule-soft);
  font-size: var(--step-0);
}
.contact__list li span {
  flex: none; width: 5.2rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.contact__list a { font-weight: 570; color: var(--ink); overflow-wrap: anywhere; }
.contact__list a:hover { color: var(--navy); }

/* --------------------------------------------------------- 11. Buttons */

.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .85rem 1.6rem;
  font-weight: 620; font-size: var(--step-0);
  border: 1px solid transparent;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn--primary { background: var(--navy); color: var(--paper); }
.btn--primary:hover { background: var(--navy-deep); }
:root[data-theme="dark"] .btn--primary { color: #16171b; }

.btn--quiet { border-color: var(--rule); color: var(--ink); }
.btn--quiet:hover { border-color: var(--navy); color: var(--navy); }
.btn--quiet .icon { transition: transform .2s var(--ease); }
.btn--quiet:hover .icon { transform: translateY(3px); }

.btn--lg { padding: 1rem 2rem; font-size: var(--step-1); }

/* ---------------------------------------------------------- 12. Footer */

.footer { border-top: 1px solid var(--rule); padding-block: 2rem; }
.footer__inner {
  display: flex; flex-wrap: wrap; gap: 1rem;
  align-items: center; justify-content: space-between;
  font-size: var(--step--1); color: var(--ink-faint);
}
.footer a { color: var(--ink-soft); font-weight: 570; }
.footer a:hover { color: var(--navy); }

/* --------------------------------------------------------- 13. Reveals */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
  transition-delay: calc(var(--reveal-delay, 0) * 70ms);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* --------------------------------------------------- 14. Motion & print */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .masthead, .skip-link, .hero__actions, .footer a, .theme-btn, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
  .section { padding-block: 1.4rem; border-top: 1px solid #ddd; }
  .study, .quote, .cv__row { break-inside: avoid; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: .75em; color: #555; }
}