/* ─── DESIGN TOKENS ─────────────────────────────────────────────── */
:root {
  /* Light — Restrained: off-white base + one accent ≤10% */
  --bg:         oklch(0.98 0.002 140);   /* off-white, not pure white */
  --surface:    oklch(0.94 0.003 140);   /* alternating section grey */
  --dark:       oklch(0.12 0.005 140);   /* hero + footer dark band */
  --dark-ink:   oklch(0.97 0.003 140);   /* primary text on dark band */
  --dark-muted: oklch(0.65 0.005 140);   /* secondary text on dark band */
  --ink:        oklch(0.14 0.005 140);
  --primary:    oklch(0.42 0.13 140);    /* dark forest green */
  --muted:      oklch(0.44 0.006 140);   /* ≥4.5:1 on both --bg and --surface */
  --border:     oklch(0.88 0.006 140);

  --font-display: 'Spectral', Georgia, serif;
  --font-body:    'Onest', system-ui, -apple-system, sans-serif;

  /* Modular type scale 1.333× */
  --step--1: clamp(0.75rem,  0.70rem + 0.25vw,  0.875rem);
  --step-0:  clamp(1rem,     0.95rem + 0.25vw,  1.0625rem);
  --step-1:  clamp(1.25rem,  1.15rem + 0.5vw,   1.5rem);
  --step-2:  clamp(1.5rem,   1.35rem + 0.75vw,  2rem);
  --step-3:  clamp(2rem,     1.7rem  + 1.5vw,   2.75rem);
  --step-5:  clamp(3rem,     2.25rem + 3.75vw,  4.5rem);

  /* Fluid spacing */
  --space-2xs: clamp(0.25rem,  0.2rem  + 0.25vw,  0.375rem);
  --space-xs:  clamp(0.5rem,   0.45rem + 0.25vw,  0.625rem);
  --space-s:   clamp(0.875rem, 0.8rem  + 0.375vw, 1.125rem);
  --space-m:   clamp(1.5rem,   1.35rem + 0.75vw,  2rem);
  --space-l:   clamp(2.5rem,   2.25rem + 1.25vw,  3.5rem);
  --space-xl:  clamp(4rem,     3.5rem  + 2.5vw,   6rem);

  --nav-h:    3.5rem;
  --max-w:    1200px;
  --narrow-w: 860px;

  --z-sticky:  100;
  --z-overlay: 200;
}

/* ─── RESET ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; display: block; }
ul, ol { list-style: none; }

a { color: var(--primary); text-decoration: none; transition: color 0.15s; }
a:hover { color: oklch(0.30 0.14 140); }

/* ─── TYPOGRAPHY ─────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: var(--step-5); letter-spacing: -0.04em; }
h2 { font-size: var(--step-3); letter-spacing: -0.025em; }
h3 { font-size: var(--step-1); letter-spacing: -0.01em; }

p { max-width: 68ch; text-wrap: pretty; }

/* ─── LAYOUT ─────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-m);
}
.container--narrow { max-width: var(--narrow-w); }

section { padding-block: clamp(2rem, 1.75rem + 1vw, 3rem); }

/* ─── BUTTON ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.015em;
  padding: 0.75rem 1.75rem;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  text-decoration: none;
  -webkit-appearance: none;
}
.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn--primary {
  background: var(--primary);
  border-color: var(--primary);
  color: oklch(0.97 0.003 140);
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s;
}
.btn--primary:hover {
  background: oklch(0.33 0.14 140);
  border-color: oklch(0.33 0.14 140);
  color: oklch(0.97 0.003 140);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px oklch(0.42 0.13 140 / 0.35);
}

/* Button variant for dark backgrounds */
.btn--light {
  border-color: oklch(0.97 0.003 140);
  color: oklch(0.97 0.003 140);
}
.btn--light:hover {
  background: oklch(0.97 0.003 140);
  color: var(--dark);
}

/* ─── NAV ────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-sticky);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding-inline: var(--space-m);
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}

/* Over the dark hero: light text */
.nav:not(.is-scrolled):not(.is-open) .nav__brand { color: var(--dark-ink); }
.nav:not(.is-scrolled):not(.is-open) .nav__links a:not(.nav__cta) { color: var(--dark-muted); }
.nav:not(.is-scrolled):not(.is-open) .nav__links a:not(.nav__cta):hover { color: var(--dark-ink); }
.nav:not(.is-scrolled):not(.is-open) .nav__cta {
  color: var(--dark-ink) !important;
  border-color: oklch(0.97 0.003 140 / 0.55) !important;
}
.nav:not(.is-scrolled):not(.is-open) .nav__cta:hover {
  background: oklch(0.97 0.003 140 / 0.15) !important;
}

/* Scrolled: white frosted bar + dark text */
.nav.is-scrolled {
  background: oklch(0.98 0.002 140 / 0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom-color: var(--border);
}

.nav__inner {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  flex-shrink: 0;
  text-decoration: none;
  transition: color 0.15s;
}
.nav__brand:hover { color: var(--primary); }

.nav__links {
  display: flex;
  gap: var(--space-m);
  align-items: center;
}
.nav__links a {
  font-size: var(--step--1);
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.01em;
  transition: color 0.15s;
  text-decoration: none;
}
.nav__links a:hover { color: var(--ink); }

.nav__cta {
  font-size: var(--step--1) !important;
  font-weight: 500 !important;
  color: var(--primary) !important;
  padding: 0.4rem 1rem;
  border: 1.5px solid var(--primary);
  transition: background 0.15s, color 0.15s, border-color 0.15s !important;
}
.nav__cta:hover {
  background: var(--primary) !important;
  color: oklch(0.97 0.003 140) !important;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--dark-ink);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: color 0.15s;
}
.nav.is-scrolled .nav__toggle { color: var(--ink); }
.nav__bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s cubic-bezier(0.16,1,0.3,1), opacity 0.2s;
}

@media (max-width: 680px) {
  .nav__toggle { display: flex; }
  .nav__links {
    display: none;
    position: fixed;
    inset: var(--nav-h) 0 0;
    background: var(--bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-l);
    z-index: var(--z-overlay);
  }
  .nav__links a { font-size: var(--step-2); color: var(--ink) !important; }
  .nav.is-open .nav__brand { color: var(--ink) !important; }
  .nav.is-open .nav__toggle { color: var(--ink); }
  .nav__cta {
    font-size: var(--step-2) !important;
    border: none !important;
    padding: 0 !important;
    color: var(--primary) !important;
  }
  .nav.is-open .nav__links { display: flex; }
  .nav.is-open .nav__bar:nth-child(1) { transform: rotate(45deg) translate(4.75px, 4.75px); }
  .nav.is-open .nav__bar:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__bar:nth-child(3) { transform: rotate(-45deg) translate(4.75px, -4.75px); }
}

/* ─── HERO (dark band) ───────────────────────────────────────────── */
.hero {
  background: var(--dark);
  min-height: 85svh;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding-block-start: calc(var(--nav-h) + var(--space-xl));
  padding-block-end: var(--space-xl);
}

.hero__content { max-width: 820px; }

.hero__eyebrow {
  display: block;
  font-size: var(--step--1);
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--dark-muted);
  letter-spacing: 0.01em;
  margin-bottom: var(--space-s);
  max-width: none;
}

.hero__headline {
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--dark-ink);
  text-wrap: balance;
  margin-bottom: var(--space-s);
}

.hero__subhead {
  font-size: var(--step-1);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.55;
  color: var(--dark-muted);
  max-width: 58ch;
  margin-bottom: var(--space-l);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  align-items: center;
}

/* Hero entrance */
.hero__eyebrow,
.hero__headline,
.hero__subhead,
.hero__actions {
  animation: fade-up 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.hero__eyebrow   { animation-delay: 0.05s; }
.hero__headline  { animation-delay: 0.15s; }
.hero__subhead   { animation-delay: 0.28s; }
.hero__actions   { animation-delay: 0.4s; }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(0.5rem); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hero__eyebrow,
  .hero__headline,
  .hero__subhead,
  .hero__actions { animation: none; }
}

/* ─── TRUST STRIP ────────────────────────────────────────────────── */
.trust {
  padding-block: var(--space-m);
  background: var(--surface);
}

.trust__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s) var(--space-l);
  align-items: center;
}

.trust__label {
  font-size: var(--step--1);
  color: var(--muted);
  font-weight: 400;
  flex-shrink: 0;
}

.trust__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s) var(--space-l);
  align-items: center;
}

.trust__logo {
  height: 56px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  display: block;
  opacity: 0.75;
  transition: opacity 0.15s;
}
.trust__logo:hover { opacity: 1; }

/* ─── WHAT I DO ──────────────────────────────────────────────────── */
.services-section { background: var(--bg); }

.services__intro {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 400;
  font-style: italic;
  color: var(--muted);
  margin-top: var(--space-s);
  margin-bottom: var(--space-l);
  max-width: none;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-l) var(--space-l);
}

.service {
  border-top: 1px solid var(--border);
  padding-top: var(--space-m);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease;
}
.service:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px oklch(0 0 0 / 0.08);
}

.service--lead {
  border-top: 2px solid var(--primary);
}

.service__icon {
  font-size: 1.5rem;
  color: var(--muted);
  margin-bottom: var(--space-s);
  display: block;
}

.service--lead .service__icon { color: var(--primary); }

.service__name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: var(--space-s);
  line-height: 1.2;
  text-wrap: balance;
}

.service__desc {
  font-size: var(--step-0);
  color: var(--muted);
  line-height: 1.65;
}

.services__closing {
  margin-top: var(--space-xl);
  padding-top: var(--space-m);
  border-top: 1px solid var(--border);
  font-size: var(--step-0);
  color: var(--muted);
  font-style: italic;
  max-width: none;
}

@media (max-width: 760px) {
  .services__grid { grid-template-columns: 1fr; }
}

/* ─── ABOUT ──────────────────────────────────────────────────────── */
.about-section { background: var(--surface); }

.about__layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-xl);
  align-items: start;
}

.about__photo-wrap {
  position: sticky;
  top: calc(var(--nav-h) + var(--space-m));
  align-self: stretch;
}

.about__photo {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  object-position: center top;
  background: var(--border);
  display: block;
}

.about__photo-placeholder {
  width: 100%;
  aspect-ratio: 4/5;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
}

.about__text h2 { margin-bottom: var(--space-m); }

.about__bio {
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--ink);
}
.about__bio + .about__bio { margin-top: var(--space-m); }

@media (max-width: 720px) {
  .about__layout {
    grid-template-columns: 1fr;
    gap: var(--space-l);
  }
  .about__photo-wrap { position: static; align-self: auto; }
  .about__photo {
    height: auto;
    aspect-ratio: 4/5;
    max-height: none;
    object-position: center top;
  }
  .about__photo-placeholder {
    aspect-ratio: 3/2;
    max-height: 360px;
  }
}

/* ─── HOW I WORK ─────────────────────────────────────────────────── */
.process-section { background: var(--bg); }

.process__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-l) var(--space-l);
  margin-top: var(--space-l);
}

.process__step {
  border-top: 1px solid var(--border);
  padding-top: var(--space-m);
}

.process__number {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 300;
  color: var(--border);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-s);
  font-variant-numeric: tabular-nums;
  display: block;
}

.process__name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: var(--space-s);
}

.process__desc {
  font-size: var(--step-0);
  color: var(--muted);
  line-height: 1.65;
}

@media (max-width: 640px) {
  .process__steps { grid-template-columns: 1fr; }
}

/* ─── SELECTED WORK ──────────────────────────────────────────────── */
.work-section { background: var(--surface); }

.work__list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--space-l);
}

.work__item {
  padding-block: var(--space-m);
  border-top: 1px solid var(--border);
  font-size: var(--step-1);
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.55;
  max-width: 72ch;
}
.work__item:last-child { border-bottom: 1px solid var(--border); }

/* ─── PUBLICATIONS ───────────────────────────────────────────────── */
.publications-section { background: var(--bg); }

.publications__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-m);
  flex-wrap: wrap;
  margin-bottom: var(--space-l);
}

.publications__header h2 { margin-bottom: 0; }

.publications__scholar-link {
  font-size: var(--step--1);
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  white-space: nowrap;
  flex-shrink: 0;
}
.publications__scholar-link:hover { color: var(--primary); }

.publications__group + .publications__group { margin-top: var(--space-l); }

.publications__type {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-m);
}

.publications__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.publication {
  display: grid;
  grid-template-columns: 4ch 1fr;
  gap: var(--space-s);
  align-items: baseline;
}

.publication__year {
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.6;
}

.publication__body { font-size: var(--step-0); line-height: 1.6; }

.publication__authors {
  display: block;
  font-size: var(--step--1);
  color: var(--muted);
}

.publication__title {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink);
  margin-block: 0.15em;
}

.publication__venue {
  display: block;
  font-size: var(--step--1);
  color: var(--muted);
}

@media (max-width: 480px) {
  .publication { grid-template-columns: 1fr; gap: 0.25rem; }
}

/* ─── CONTACT ────────────────────────────────────────────────────── */
.contact-section { background: var(--surface); }

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact__lead {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 400;
  line-height: 1.35;
  color: var(--ink);
  max-width: 34ch;
  margin-top: var(--space-m);
  margin-bottom: var(--space-l);
}

.contact__where-label {
  font-size: var(--step--1);
  color: var(--muted);
  margin-bottom: var(--space-m);
  max-width: none;
}

.contact__link-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
  margin-top: 0;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--step-0);
  color: var(--ink);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s;
}
.contact__link:hover { color: var(--primary); }

.social__logo {
  height: 36px;
  width: auto;
  max-width: 110px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
  opacity: 0.85;
  transition: opacity 0.15s;
}
.contact__link:hover .social__logo { opacity: 1; }

@media (max-width: 640px) {
  .contact__layout { grid-template-columns: 1fr; gap: var(--space-l); }
}

/* ─── FOOTER (dark band) ─────────────────────────────────────────── */
.footer {
  background: var(--dark);
  padding-block: var(--space-l);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer__copy {
  font-size: var(--step--1);
  color: var(--dark-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-l);
  align-items: center;
}

.footer__logo {
  height: 20px;
  width: auto;
  max-width: 80px;
  object-fit: contain;
  display: block;
  opacity: 0.55;
  transition: opacity 0.15s;
  filter: brightness(10);
}
.footer__links a:hover .footer__logo { opacity: 0.9; }

/* Panteion text link in footer (no small icon image available) */
.footer__links a {
  color: var(--dark-muted);
  font-size: var(--step--1);
  text-decoration: none;
  transition: color 0.15s;
}
.footer__links a:hover { color: var(--dark-ink); }

/* ─── BACK TO TOP ────────────────────────────────────────────────── */
.back-to-top {
  display: none;
  position: fixed;
  inset-block-end: var(--space-m);
  inset-inline-end: var(--space-m);
  z-index: var(--z-sticky);
  width: 2.5rem;
  height: 2.5rem;
  background: var(--ink);
  color: var(--bg);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.back-to-top:hover { background: var(--primary); }
.back-to-top.is-visible { display: flex; }

/* ─── SCROLL REVEAL ──────────────────────────────────────────────── */
.will-reveal {
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.35s ease-out, transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.will-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .service { transition: none; }
  .service:hover { transform: none; box-shadow: none; }
  .btn--primary { transition: background 0.2s, border-color 0.2s, color 0.2s; }
  .btn--primary:hover { transform: none; box-shadow: none; }
  .will-reveal { opacity: 1; transform: none; transition: none; }
}

/* ─── UTILITIES ──────────────────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}