/* ==========================================================================
   Adi Sawant — Scholarly / Research Profile
   Design tokens
   ========================================================================== */

:root {
  /* Color */
  --color-paper: #FAFAF7;
  --color-paper-alt: #F2F0EA;
  --color-ink: #1A1D1F;
  --color-ink-soft: #4A4E52;
  --color-slate: #2B4570;
  --color-slate-soft: #5B7299;
  --color-brass: #A87C3F;
  --color-rule: #D8D6D0;
  --color-rule-soft: #E8E6E0;

  /* Type */
  --font-display: 'Source Serif 4', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;

  /* Scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.1rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.4vw, 1.35rem);
  --step-2: clamp(1.5rem, 1.35rem + 0.7vw, 1.8rem);
  --step-3: clamp(1.9rem, 1.65rem + 1.1vw, 2.4rem);
  --step-4: clamp(2.4rem, 2rem + 1.8vw, 3.4rem);

  --nav-width: 260px;
  --content-max: 780px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--color-ink);
  margin: 0 0 0.5em 0;
}

a {
  color: var(--color-slate);
  text-decoration: none;
  border-bottom: 1px solid var(--color-slate-soft);
  transition: border-color 0.15s ease, color 0.15s ease;
}

a:hover {
  color: var(--color-brass);
  border-color: var(--color-brass);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-brass);
  outline-offset: 3px;
}

p { margin: 0 0 1.1em 0; color: var(--color-ink-soft); }

/* Layout: nav rail + content ------------------------------------------- */

.layout {
  display: flex;
  min-height: 100vh;
}

.nav-rail {
  width: var(--nav-width);
  flex-shrink: 0;
  padding: 3rem 2rem;
  border-right: 1px solid var(--color-rule);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  margin-bottom: 0.15em;
}

.nav-tagline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  margin-bottom: 2.5rem;
  display: block;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-list li { margin-bottom: 0.35rem; }

.nav-list a {
  display: block;
  border-bottom: none;
  font-size: var(--step--1);
  color: var(--color-ink-soft);
  padding: 0.4rem 0.6rem;
  border-radius: 3px;
  border-left: 2px solid transparent;
}

.nav-list a:hover {
  color: var(--color-ink);
  background: var(--color-paper-alt);
}

.nav-list a.active {
  color: var(--color-ink);
  border-left: 2px solid var(--color-brass);
  background: var(--color-paper-alt);
  font-weight: 500;
}

.nav-list .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--color-brass);
  margin-right: 0.5em;
}

.nav-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-rule);
  font-size: 0.72rem;
  color: var(--color-ink-soft);
}

.nav-footer a { color: var(--color-ink-soft); }

main {
  flex: 1;
  padding: 4rem 3rem 6rem;
  max-width: 980px;
}

.content {
  max-width: var(--content-max);
}

/* Mobile nav toggle ------------------------------------------------------ */

.nav-toggle {
  display: none;
}

@media (max-width: 880px) {
  .layout { flex-direction: column; }

  .nav-rail {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--color-rule);
    padding: 1.5rem;
  }

  .nav-tagline { margin-bottom: 1rem; }

  .nav-list {
    display: none;
  }

  .nav-list.open { display: block; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    background: none;
    border: 1px solid var(--color-rule);
    color: var(--color-ink);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.5em 0.9em;
    border-radius: 3px;
    cursor: pointer;
    margin-bottom: 1rem;
  }

  main { padding: 2.5rem 1.5rem 4rem; }
}

/* Type utilities ---------------------------------------------------------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-brass);
  display: block;
  margin-bottom: 0.8rem;
}

h1.page-title { font-size: var(--step-4); margin-bottom: 0.3em; }
h2.section-title { font-size: var(--step-2); margin-top: 3rem; }
h3.sub-title { font-size: var(--step-1); margin-top: 2rem; }

.lede {
  font-size: var(--step-1);
  color: var(--color-ink-soft);
  font-family: var(--font-display);
  font-style: italic;
  max-width: 640px;
}

/* Rules & dividers -------------------------------------------------------- */

hr.rule {
  border: none;
  border-top: 1px solid var(--color-rule);
  margin: 2.5rem 0;
}

/* Cards / entries ----------------------------------------------------------- */

.entry {
  border-top: 1px solid var(--color-rule-soft);
  padding: 1.6rem 0;
}

.entry:first-of-type { border-top: none; padding-top: 0.5rem; }

.entry-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-slate);
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 0.4rem;
}

.entry h3 { margin-bottom: 0.2em; }

.entry-org {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
  margin-bottom: 0.6em;
  display: block;
}

.entry ul {
  margin: 0.6em 0 0 0;
  padding-left: 1.2em;
  color: var(--color-ink-soft);
}

.entry li { margin-bottom: 0.4em; }

/* Tags ---------------------------------------------------------------------- */

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin-top: 0.8em;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  color: var(--color-ink-soft);
  border: 1px solid var(--color-rule);
  padding: 0.25em 0.7em;
  border-radius: 20px;
  background: var(--color-paper-alt);
}

/* Callout / spec annotation (signature element) ----------------------------- */

.spec-note {
  position: relative;
  padding-left: 1.4em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  border-left: 1px solid var(--color-brass);
  margin: 2.5rem 0;
  padding: 0.2rem 0 0.2rem 1.4em;
}

.spec-note strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* Credential grid (About page signature) ------------------------------------ */

.credential-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  margin: 2.5rem 0;
  border-top: 1px solid var(--color-rule);
  border-left: 1px solid var(--color-rule);
}

.credential {
  padding: 1.4rem 1.5rem;
  border-right: 1px solid var(--color-rule);
  border-bottom: 1px solid var(--color-rule);
  position: relative;
}

.credential .tick {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-brass);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.5em;
}

.credential .value {
  font-family: var(--font-display);
  font-size: var(--step-1);
  display: block;
  margin-bottom: 0.15em;
}

.credential .label {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
}

/* Buttons / links as CTAs ---------------------------------------------------- */

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  padding: 0.65em 1.3em;
  border: 1px solid var(--color-ink);
  border-radius: 3px;
  color: var(--color-ink);
  background: transparent;
}

.btn:hover {
  background: var(--color-ink);
  color: var(--color-paper);
  border-color: var(--color-ink);
}

.btn-row { display: flex; gap: 0.8em; flex-wrap: wrap; margin-top: 1.5rem; }

/* Footer ---------------------------------------------------------------------- */

.page-footer {
  margin-top: 5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-rule);
  font-size: 0.78rem;
  color: var(--color-ink-soft);
}

/* Contact form ------------------------------------------------------------------ */

.contact-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.contact-list li {
  padding: 1rem 0;
  border-top: 1px solid var(--color-rule-soft);
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.contact-list .contact-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
  width: 90px;
  flex-shrink: 0;
}