/* =========================================================================
   Babak Goshayeshi - portfolio
   Visual language referenced from anthropic.com: warm ivory paper background,
   clay/terracotta accent, editorial serif display + clean grotesque body.
   ========================================================================= */

:root {
  /* Surfaces */
  --paper:        #F0EEE6;   /* primary background - Anthropic "kraft" ivory */
  --paper-2:      #F5F4EF;
  --card:         #FBFAF6;
  --ink:          #1A1A18;   /* near-black text */
  --ink-soft:     #3D3C37;
  --muted:        #6B6A62;
  --line:         #E2DED2;   /* hairline borders */
  --line-strong:  #D6D1C4;

  /* Accents (earth tones) */
  --clay:         #CC785C;   /* signature terracotta */
  --clay-deep:    #B5613F;
  --slate:        #3F4A52;
  --olive:        #7C7A52;

  /* Type */
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans:  "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;

  /* Rhythm */
  --maxw: 1160px;
  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.08; letter-spacing: -0.01em; }

.wrap { width: min(100% - 48px, var(--maxw)); margin-inline: auto; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay-deep);
  margin: 0 0 18px;
}

/* ----------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans); font-size: 15px; font-weight: 500;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--ink); color: #F7F5EE; }
.btn--primary:hover { background: #000; }
.btn--clay { background: var(--clay); color: #fff; }
.btn--clay:hover { background: var(--clay-deep); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--ink); background: rgba(0,0,0,.03); }
.btn .arrow { transition: transform .2s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* -------------------------------------------------------------------- nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}
.nav.scrolled { border-color: var(--line); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 600; letter-spacing: -0.01em; }
.brand__mark {
  width: 30px; height: 30px; border-radius: 8px; flex: none;
  background: var(--ink); color: #F0EEE6;
  display: grid; place-items: center;
  font-family: var(--serif); font-size: 16px; font-weight: 600;
}
.brand__mark span { transform: translateY(0.5px); }
.brand__logo { width: 22px; height: auto; display: block; filter: invert(1); }
.nav__links { display: flex; align-items: center; gap: 28px; }
.nav__links a { font-size: 15px; color: var(--ink-soft); transition: color .2s ease; }
.nav__links a:hover { color: var(--ink); }
.nav__cta { display: flex; align-items: center; gap: 14px; }
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; transition: .25s; }

/* ------------------------------------------------------------------- hero */
.hero { padding: 64px 0 40px; }

/* Two-column hero: copy on the left, computational-sciences flow on the right */
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
  grid-template-areas:
    "head viz"
    "body body";
  column-gap: 52px;
  row-gap: 8px;
  align-items: start;
}
.hero__head { grid-area: head; max-width: 720px; }
.hero__body { grid-area: body; max-width: 720px; }

/* Computational-sciences flow, to the right of the headline */
.hero__viz { grid-area: viz; margin: 0; width: 100%; }
.hero__viz-frame {
  display: block;
  width: 100%;
  height: 570px;
  border: 0;
  background: transparent;
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 58px);
  margin: 0 0 24px;
  letter-spacing: -0.02em;
}
.hero h1 em { font-style: italic; color: var(--clay-deep); }
.hero__sub {
  font-size: 18px; color: var(--ink-soft); max-width: 46ch; margin: 0 0 32px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 18px; font-size: 14px; color: var(--muted); }
.hero__meta span { display: inline-flex; align-items: center; gap: 7px; }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--clay); }

/* ------------------------------------------------------------- secondary tagline / marquee */
.affil { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 28px 0; margin-top: 30px; }
.affil__inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.affil__line { font-family: var(--serif); font-style: italic; font-size: 18px; color: var(--ink-soft); max-width: 40ch; }
.affil__logos { display: flex; gap: 26px; flex-wrap: wrap; color: var(--muted); font-size: 14px; font-weight: 500; }
.affil__logos span { white-space: nowrap; }

/* --------------------------------------------------------------- sections */
section { padding: 84px 0; }
.section__head { max-width: 60ch; margin-bottom: 44px; }
.section__head h2 { font-size: clamp(26px, 3.4vw, 40px); margin: 0 0 16px; }
.section__head p { color: var(--ink-soft); font-size: 18px; margin: 0; }

/* about */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.about p { font-size: 18px; color: var(--ink-soft); margin: 0 0 20px; }
.about p:last-child { margin-bottom: 0; }
.about strong { color: var(--ink); font-weight: 600; }

/* value cards */
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.vcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.vcard:hover { transform: translateY(-3px); box-shadow: 0 20px 40px -28px rgba(40,30,20,.4); border-color: var(--line-strong); }
.vcard__ico {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--clay) 16%, var(--paper)); margin-bottom: 18px;
}
.vcard h3 { font-size: 21px; margin: 0 0 10px; }
.vcard p { margin: 0; color: var(--muted); font-size: 15.5px; }

/* ventures - DiPhyx & dxflow */
/* intro: heading on the left, DiPhyx mark on the right */
.ventures__intro {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 28px;
  margin-bottom: 44px;
}
.ventures__intro .section__head { margin-bottom: 0; }
.ventures__logo { flex: 0 0 auto; height: 110px; width: auto; }
.ventures__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.venture {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.venture:hover { transform: translateY(-3px); box-shadow: 0 26px 54px -30px rgba(40,30,20,.45); border-color: var(--line-strong); }
.venture__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.venture__logo { height: 40px; width: auto; }
.venture__tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--clay-deep); border: 1px solid var(--line-strong); border-radius: 999px; padding: 4px 11px;
}
.venture__lead { font-family: var(--serif); font-size: 20px; line-height: 1.25; color: var(--ink); margin: 0 0 14px; }
.venture__body { font-size: 15.5px; color: var(--ink-soft); margin: 0 0 18px; }
.venture__feats { list-style: none; margin: 0 0 24px; padding: 0; }
.venture__feats li {
  position: relative; padding-left: 24px; margin-bottom: 12px; font-size: 14.5px; color: var(--muted);
}
.venture__feats li::before {
  content: ""; position: absolute; left: 4px; top: 8px; width: 7px; height: 7px;
  border-radius: 50%; background: var(--clay);
}
.venture__feats strong { color: var(--ink); font-weight: 600; }
.venture__links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: auto; }

/* work / projects */
.work { background: var(--paper-2); }

/* intro: temperature-field video on the left, section heading on the right */
.work__intro {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 44px;
  align-items: center;
  margin-bottom: 48px;
}
.work__media { margin: 0; }
.work__video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: 0 26px 54px -34px rgba(40, 30, 20, 0.5);
  background: var(--card);
}
.work__intro .section__head { margin-bottom: 0; max-width: none; }

.projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.pcard {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  position: relative; overflow: hidden;
}
.pcard:hover { transform: translateY(-3px); box-shadow: 0 26px 50px -30px rgba(40,30,20,.45); border-color: var(--line-strong); }
.pcard__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.pcard__kind { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--clay-deep); }
.pcard__live { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 7px; }
.pcard h3 { font-size: 22px; margin: 0 0 10px; }
.pcard p { margin: 0 0 18px; color: var(--muted); font-size: 15.5px; flex: 1; }
.pcard__foot { display: flex; align-items: center; justify-content: space-between; }
.pcard__focus { font-size: 13px; color: var(--ink-soft); }
.pcard__go { font-size: 14px; font-weight: 500; color: var(--ink); display: inline-flex; gap: 6px; align-items: center; }
.pcard--feature { grid-column: span 2; }
.tag-todo { font-family: var(--mono); font-size: 10px; letter-spacing:.1em; text-transform: uppercase; color: var(--muted);
  border: 1px dashed var(--line-strong); border-radius: 999px; padding: 2px 8px; }

/* timeline */
.timeline { position: relative; max-width: 820px; }
.timeline::before { content:""; position:absolute; left: 9px; top: 6px; bottom: 6px; width: 2px; background: var(--line-strong); }
.tl { position: relative; padding: 0 0 38px 44px; }
.tl:last-child { padding-bottom: 0; }
.tl__dot { position: absolute; left: 0; top: 4px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--clay); display: grid; place-items: center; }
.tl__dot::after { content:""; width: 7px; height: 7px; border-radius: 50%; background: var(--clay); }
.tl__role { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-bottom: 4px; }
.tl__role h3 { font-size: 20px; margin: 0; }
.tl__org { color: var(--clay-deep); font-weight: 600; font-size: 15px; }
.tl__when { font-family: var(--mono); font-size: 12.5px; color: var(--muted); margin-bottom: 12px; }
.tl ul { margin: 0; padding-left: 18px; color: var(--ink-soft); font-size: 15.5px; }
.tl li { margin-bottom: 6px; }

/* capabilities */
.caps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 40px; }
.cap { border-top: 1px solid var(--line); padding-top: 18px; }
.cap h3 { font-family: var(--sans); font-weight: 600; font-size: 16px; margin: 0 0 10px; }
.cap .chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 13px; color: var(--ink-soft); background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; }

/* publications */
.pubs { background: var(--paper-2); }
.publist { display: grid; gap: 0; max-width: 880px; }
.pub { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 22px 0; border-top: 1px solid var(--line); }
.pub:last-child { border-bottom: 1px solid var(--line); }
.pub__yr { font-family: var(--mono); font-size: 14px; color: var(--clay-deep); }
.pub__t { font-size: 16.5px; color: var(--ink); margin: 0 0 4px; font-weight: 500; }
.pub__v { font-size: 14px; color: var(--muted); margin: 0; }

/* contact */
.contact { text-align: center; }
.contact h2 { font-size: clamp(30px, 4.4vw, 52px); margin: 0 auto 20px; max-width: 18ch; }
.contact p { font-size: 18px; color: var(--ink-soft); max-width: 56ch; margin: 0 auto 30px; }
.contact__actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }
.contact__links { display: flex; justify-content: center; flex-wrap: wrap; gap: 22px; font-size: 14px; color: var(--muted); }
.contact__links a { color: var(--ink-soft); border-bottom: 1px solid var(--line-strong); padding-bottom: 1px; }
.contact__links a:hover { color: var(--clay-deep); border-color: var(--clay); }

/* footer */
.footer { border-top: 1px solid var(--line); padding: 36px 0; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; font-size: 14px; color: var(--muted); }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ------------------------------------------------------------- responsive */
@media (max-width: 920px) {
  .hero__grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "head"
      "viz"
      "body";
    gap: 32px;
  }
  .hero__head, .hero__body { max-width: 720px; }
  .hero__viz-frame { height: 570px; }
  .work__intro { grid-template-columns: 1fr; gap: 24px; }
  .about__grid { grid-template-columns: 1fr; gap: 24px; }
  .values { grid-template-columns: 1fr; }
  .ventures__grid { grid-template-columns: 1fr; }
  .caps { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 40px 0 24px; }
  .hero__viz-frame { height: 320px; }
  .nav__links, .nav__cta .btn { display: none; }
  .nav__toggle { display: block; }
  .nav.open .nav__links {
    display: flex; flex-direction: column; gap: 0;
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px 24px 18px;
  }
  .nav.open .nav__links a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .projects { grid-template-columns: 1fr; }
  .ventures__intro { flex-direction: column; align-items: flex-start; gap: 24px; }
  .ventures__logo { height: 84px; }
  .pcard--feature { grid-column: span 1; }
  section { padding: 60px 0; }
  .pub { grid-template-columns: 48px 1fr; gap: 12px; }
}