/* =====================================================================
   Dr Tsendpurev Tsegmid — personal site
   Aesthetic: contemporary classic / editorial minimalism.
   Palette: navy #1B4F72, amber #D9772E, charcoal #2C3E50,
   cool ink on a clean white page, with amber as the single accent.
   Type: Newsreader (contemporary display serif) + Manrope (body sans).
   ===================================================================== */

:root {
  --navy:        #1b4f72;
  --navy-deep:   #122f44;
  --navy-ink:    #16384e;
  --charcoal:    #2c3e50;
  --amber:       #d9772e;
  --amber-deep:  #b85f1f;
  --paper:       #ffffff;
  --paper-2:     #f5f5f3;
  --paper-3:     #ededea;
  --muted:       #696760;
  --muted-soft:  #8a877f;
  --line:        rgba(28, 45, 58, 0.13);
  --line-soft:   rgba(28, 45, 58, 0.07);
  --paper-line:  rgba(255, 255, 255, 0.18);

  --maxw: 1180px;
  --gutter: clamp(1.25rem, 5vw, 5rem);
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Manrope", -apple-system, BlinkMacSystemFont, sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--charcoal);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.65;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
::selection { background: var(--amber); color: var(--paper); }

h1, h2, h3 { font-family: var(--serif); font-weight: 400; margin: 0; }

.ic { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round; }

/* ---------- shared section frame ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(4.5rem, 9vw, 8.5rem) var(--gutter);
  border-top: 1px solid var(--line);
}
.section__head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.index {
  display: inline-block;
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--amber);
  letter-spacing: 0.18em;
  margin-bottom: 1.1rem;
  position: relative;
  padding-left: 2.6rem;
}
.index::before {
  content: "";
  position: absolute; left: 0; top: 0.62em;
  width: 2rem; height: 1px; background: var(--amber);
}
.index--light { color: #e9a16a; }
.index--light::before { background: #e9a16a; }

.section__title {
  font-size: clamp(2rem, 4.6vw, 3.35rem);
  line-height: 1.04;
  letter-spacing: -0.018em;
  color: var(--navy-ink);
  max-width: 16ch;
}
.section__kicker {
  margin: 1.4rem 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 1.06rem;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  padding: 0.95em 1.7em;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.4s var(--ease), color 0.4s var(--ease),
    border-color 0.4s var(--ease), transform 0.3s var(--ease);
}
.btn--solid { background: var(--navy-ink); color: var(--paper); }
.btn--solid:hover { background: var(--amber); transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--navy-ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--navy-ink); transform: translateY(-2px); }
.btn--full { width: 100%; padding: 1.05em; font-size: 0.98rem; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem var(--gutter);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); }
.nav__brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; color: var(--navy-ink); }
.nav__mark {
  display: grid; place-items: center;
  width: 2rem; height: 2rem; border-radius: 4px;
  background: var(--navy-ink); color: var(--paper);
  font-family: var(--serif); font-size: 0.85rem; letter-spacing: 0.04em;
}
.nav__name { font-family: var(--serif); font-size: 1.02rem; letter-spacing: 0.01em; }
.nav__links { display: flex; align-items: center; gap: 1.9rem; }
.nav__links a {
  text-decoration: none; color: var(--charcoal);
  font-size: 0.92rem; font-weight: 500; letter-spacing: 0.01em;
  position: relative; padding: 0.2rem 0;
}
.nav__links a:not(.nav__cta)::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 1px; background: var(--amber);
  transform: scaleX(0); transform-origin: right; transition: transform 0.4s var(--ease);
}
.nav__links a:not(.nav__cta):hover::after { transform: scaleX(1); transform-origin: left; }
.nav__cta {
  border: 1px solid var(--line); border-radius: 2px;
  padding: 0.5rem 1.05rem !important;
  transition: background 0.35s var(--ease), color 0.35s var(--ease), border-color 0.35s var(--ease);
}
.nav__cta:hover { background: var(--navy-ink); color: var(--paper); border-color: var(--navy-ink); }

.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: 0.5rem; }
.nav__toggle span { display: block; width: 24px; height: 2px; background: var(--navy-ink); transition: transform 0.35s var(--ease), opacity 0.35s var(--ease); }
.nav__toggle span + span { margin-top: 6px; }
.nav__toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

.mobile-menu {
  position: sticky; top: 0; z-index: 40;
  display: flex; flex-direction: column;
  background: var(--paper); border-bottom: 1px solid var(--line);
  padding: 0.5rem var(--gutter) 1.4rem;
}
.mobile-menu a { text-decoration: none; color: var(--navy-ink); font-family: var(--serif);
  font-size: 1.35rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line-soft); }

/* ---------- hero ---------- */
.hero { padding: clamp(2.5rem, 6vw, 5rem) var(--gutter) clamp(2rem, 4vw, 3rem); max-width: var(--maxw); margin: 0 auto; }
.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.hero__text { text-align: center; }
.eyebrow {
  margin: 0 0 1.6rem;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--amber-deep);
}
.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 1.02; letter-spacing: -0.022em;
  color: var(--navy-ink);
  margin-bottom: 1.8rem;
}
.hero__title-em { font-style: italic; font-weight: 300; color: var(--amber-deep); }
.hero__lead {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.5vw, 1.85rem);
  line-height: 1.32; font-weight: 400;
  color: var(--navy-ink);
  max-width: 28ch;
  margin: 0 auto 1.5rem;
}
.hero__sub { max-width: 56ch; color: var(--muted); margin: 0 auto 1.9rem; }
.hero__meta { margin-bottom: 2rem; }
.hero__loc { display: inline-flex; align-items: center; gap: 0.55rem;
  font-size: 0.92rem; font-weight: 500; color: var(--charcoal); letter-spacing: 0.01em; }
.hero__loc .ic { width: 1.05rem; height: 1.05rem; color: var(--amber); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; }

.hero__seeking {
  margin: clamp(3rem, 6vw, 4.5rem) auto 0;
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.55;
  color: var(--navy-ink);
  max-width: 70ch;
  text-align: center;
}
.hero__seeking span { color: var(--muted); font-family: var(--sans); font-size: 0.82rem;
  text-transform: uppercase; letter-spacing: 0.12em; font-weight: 600; }

/* ---------- partners marquee ---------- */
.partners {
  background: var(--navy-ink); color: var(--paper);
  overflow: hidden; padding: 1.15rem 0;
  border-top: 1px solid var(--navy-deep);
}
.partners__track {
  display: inline-flex; align-items: center; gap: 1.6rem;
  white-space: nowrap;
  animation: marquee 42s linear infinite;
  will-change: transform;
}
.partners__track span { font-size: 0.92rem; letter-spacing: 0.04em; opacity: 0.92; }
.partners__track i { color: var(--amber); font-style: normal; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .partners__track { animation: none; } }

/* ---------- about ---------- */
.about__grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2.5rem, 6vw, 5rem);
}
.about__lead p { font-size: 1.12rem; color: #45403a; margin: 0 0 1.3rem; }
.about__lead p:first-child { font-family: var(--serif); font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  line-height: 1.4; color: var(--navy-ink); }
.about__lead em { font-style: italic; color: var(--amber-deep); }

.pillars { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.6rem; align-self: start; }
.pillars li {
  padding: 1.6rem 1.7rem; background: var(--paper-2);
  border-radius: 3px; position: relative;
  border-left: 2px solid var(--amber);
}
.pillars__n {
  font-family: var(--serif); font-style: italic; font-size: 1.1rem;
  color: var(--amber-deep); display: block; margin-bottom: 0.5rem;
}
.pillars h3 { font-size: 1.32rem; color: var(--navy-ink); margin-bottom: 0.45rem; letter-spacing: -0.01em; }
.pillars p { margin: 0; font-size: 0.98rem; color: var(--muted); }

/* ---------- capabilities ---------- */
.cap-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: 3px; overflow: hidden;
}
.cap {
  background: var(--paper); padding: clamp(1.7rem, 2.6vw, 2.4rem);
  transition: background 0.45s var(--ease);
}
.cap:hover { background: var(--paper-2); }
.cap h3 { font-size: 1.3rem; color: var(--navy-ink); margin-bottom: 0.7rem; line-height: 1.15; letter-spacing: -0.01em; }
.cap p { margin: 0; font-size: 0.98rem; color: var(--muted); }
.cap__proof {
  margin-top: 1.1rem !important; padding-top: 0.9rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.78rem !important; letter-spacing: 0.03em;
  color: var(--amber-deep) !important; font-weight: 500;
}

/* ---------- selected work ---------- */
.cases { list-style: none; margin: 0; padding: 0; counter-reset: c; }
.case {
  display: grid; grid-template-columns: 0.32fr 1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: clamp(1.8rem, 3.5vw, 2.6rem) 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.case:last-child { border-bottom: 1px solid var(--line); }
.case__meta { display: flex; flex-direction: column; gap: 0.35rem; }
.case__year { font-family: var(--serif); font-size: 1.35rem; color: var(--amber-deep); }
.case__funder { font-size: 0.82rem; letter-spacing: 0.04em; color: var(--muted-soft);
  text-transform: uppercase; font-weight: 600; }
.case__body h3 {
  font-size: clamp(1.4rem, 2.6vw, 2rem); color: var(--navy-ink);
  line-height: 1.12; letter-spacing: -0.012em; margin-bottom: 0.5rem;
  transition: color 0.35s var(--ease);
}
.case:hover .case__body h3 { color: var(--amber-deep); }
.case__role {
  margin: 0 0 0.9rem; font-weight: 600; font-size: 0.9rem;
  color: var(--charcoal); letter-spacing: 0.02em;
}
.case__body p:last-child { margin: 0; color: var(--muted); max-width: 60ch; }

/* ---------- journey timeline ---------- */
.arc-frames {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: clamp(0.6rem, 1.5vw, 1.1rem);
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0.9rem;
}
.arc-frames figure {
  position: relative; margin: 0;
  border-radius: 3px; overflow: hidden;
  box-shadow: 0 16px 30px -22px rgba(18, 47, 68, 0.55);
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.arc-frames figure:hover { transform: translateY(-3px); }
.arc-frames img {
  display: block;
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover;
  filter: grayscale(100%) contrast(1.03);
}
.arc-frames__cap {
  margin: 0 0 clamp(2.2rem, 5vw, 3.4rem);
  font-size: 0.78rem; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--muted-soft);
}
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.timeline li {
  display: grid; grid-template-columns: 0.3fr 1fr; gap: clamp(1.5rem, 4vw, 4rem);
  padding: clamp(1.6rem, 3vw, 2.3rem) 0;
  border-top: 1px solid var(--line);
  position: relative;
}
.timeline li:first-child { border-top: 0; }
.timeline__years { font-family: var(--serif); font-style: italic; font-size: 1.2rem; color: var(--amber-deep); }
.timeline h3 { font-size: 1.4rem; color: var(--navy-ink); margin-bottom: 0.35rem; letter-spacing: -0.01em; }
.timeline p { margin: 0; color: var(--muted); max-width: 60ch; }

/* ---------- credentials ---------- */
.cred-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(2.2rem, 5vw, 4rem) clamp(3rem, 7vw, 6rem); }
.cred h3 {
  font-size: 1.05rem; font-family: var(--sans); font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber-deep);
  margin-bottom: 1.4rem; padding-bottom: 0.7rem; border-bottom: 1px solid var(--line);
}
.cred ul { list-style: none; margin: 0; padding: 0; }
.cred li { padding: 0.7rem 0; border-bottom: 1px solid var(--line-soft); }
.cred li:last-child { border-bottom: 0; }
.cred li strong { display: block; font-family: var(--serif); font-weight: 400;
  font-size: 1.18rem; color: var(--navy-ink); line-height: 1.25; letter-spacing: -0.005em; }
.cred li span { display: block; font-size: 0.9rem; color: var(--muted); margin-top: 0.15rem; }
.cred li em { font-style: italic; }
.cred li a { color: inherit; text-decoration: none; border-bottom: 1px solid var(--line); transition: border-color 0.35s var(--ease), color 0.35s var(--ease); }
.cred li a:hover { color: var(--amber); border-bottom-color: var(--amber); }
.cred__lang { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 1.5rem; }
.cred__lang li { border-bottom: 1px solid var(--line-soft) !important; }
.cred__note { margin: 1.3rem 0 0; font-size: 0.92rem; color: var(--muted); font-style: italic; }

/* ---------- contact ---------- */
.contact {
  background: var(--navy-ink); color: var(--paper);
  max-width: none; border-top: 0;
  padding: clamp(4.5rem, 9vw, 8rem) var(--gutter);
}
.contact__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2.5rem, 6vw, 5.5rem); align-items: start;
}
.contact__title {
  font-size: clamp(1.8rem, 3.6vw, 2.85rem); line-height: 1.12;
  letter-spacing: -0.015em; color: var(--paper);
  margin: 0.6rem 0 1.5rem; max-width: 20ch;
}
.contact__title em { font-style: italic; }
.contact__line { color: rgba(251, 248, 242, 0.78); max-width: 50ch; margin: 0 0 2.4rem; }
.contact__direct { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.contact__direct li {
  display: flex; gap: 1.3rem; align-items: baseline;
  padding: 0.85rem 0; border-top: 1px solid var(--paper-line);
}
.contact__direct li:last-child { border-bottom: 1px solid var(--paper-line); }
.contact__direct span:first-child {
  flex: 0 0 6rem; font-size: 0.74rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: #e9a16a; font-weight: 600; padding-top: 0.15rem;
}
.contact__direct a, .contact__plain {
  font-family: var(--serif); font-size: 1.25rem; color: var(--paper);
  text-decoration: none; letter-spacing: 0.005em;
  border-bottom: 1px solid transparent; transition: border-color 0.35s var(--ease), color 0.35s var(--ease);
}
.contact__direct a:hover { border-bottom-color: var(--amber); color: #f6cba3; }

.contact__form { background: var(--paper); border-radius: 4px; padding: clamp(1.6rem, 3vw, 2.4rem); }
.hp { position: absolute; left: -9999px; }
.field { margin-bottom: 1.15rem; }
.field label { display: block; font-size: 0.82rem; font-weight: 600; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--charcoal); margin-bottom: 0.5rem; }
.field .opt { text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--muted-soft); }
.field input, .field textarea {
  width: 100%; font-family: var(--sans); font-size: 1rem; color: var(--charcoal);
  background: var(--paper-2); border: 1px solid transparent;
  border-radius: 2px; padding: 0.8rem 0.9rem; resize: vertical;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--amber); background: #fff;
  box-shadow: 0 0 0 3px rgba(217, 119, 46, 0.12);
}
.form-status { margin: 1rem 0 0; font-size: 0.95rem; font-weight: 500; }
.form-status.is-ok { color: var(--navy); }
.form-status.is-err { color: #b23b2e; }

/* ---------- footer ---------- */
.footer {
  background: var(--navy-deep); color: var(--paper);
  padding: clamp(3rem, 6vw, 4.5rem) var(--gutter) 2.5rem;
}
.footer__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; align-items: flex-end;
  padding-bottom: 2rem; border-bottom: 1px solid var(--paper-line);
}
.footer__name { font-family: var(--serif); font-size: 1.7rem; margin: 0 0 0.3rem; letter-spacing: -0.01em; }
.footer__tag { margin: 0; font-size: 0.88rem; color: rgba(251, 248, 242, 0.66); letter-spacing: 0.02em; }
.footer__links { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.footer__links a { text-decoration: none; font-size: 0.92rem; font-weight: 500;
  color: rgba(251, 248, 242, 0.85); border-bottom: 1px solid transparent; padding-bottom: 2px;
  transition: border-color 0.35s var(--ease), color 0.35s var(--ease); }
.footer__links a:hover { color: #f6cba3; border-bottom-color: var(--amber); }
.footer__fine { max-width: var(--maxw); margin: 1.6rem auto 0; font-size: 0.8rem;
  color: rgba(251, 248, 242, 0.5); letter-spacing: 0.01em; }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ============ responsive ============ */
@media (max-width: 920px) {
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .about__grid { grid-template-columns: 1fr; }
  .contact__inner { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__toggle { display: block; }
  .hero__inner { grid-template-columns: 1fr; gap: 2.8rem; }
  .cap-grid { grid-template-columns: 1fr; }
  .case { grid-template-columns: 1fr; gap: 0.8rem; }
  .case__meta { flex-direction: row; align-items: baseline; gap: 0.9rem; }
  .timeline li { grid-template-columns: 1fr; gap: 0.5rem; }
  .cred-grid { grid-template-columns: 1fr; }
  .arc-frames {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: 44%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    margin-inline: calc(-1 * var(--gutter));
    padding: 0 var(--gutter) 0.6rem;
  }
  .arc-frames figure { scroll-snap-align: start; }
}
@media (min-width: 761px) { .mobile-menu { display: none !important; } }