@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500&display=swap');


:root {
  --color-bg:          #f5f4f0;
  --color-bg-hover:    #ece9e3;
  --color-text:        #111;
  --color-text-muted:  #888;
  --color-text-dim:    #aaa;
  --color-border:      #111;
  --color-border-nav:  #ddd;

  --font-serif: 'DM Serif Display', serif;
  --font-sans:  'DM Sans', sans-serif;

  --nav-height: 56px;
  --section-gap: 56px;
  --content-max: 1100px;
}


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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  font-family: var(--font-sans);
  color: var(--color-text);
  overflow-x: hidden;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

/*--------------------------------
MARK: NAV
--------------------------------*/


#nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-nav);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 24px;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-text);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo:hover {
  opacity: 0.6;
}

#nav-links {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  gap: 28px;
}

.nav-link {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color 0.15s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}


.nav-link--active {
  text-decoration: underline;
  text-underline-offset: 3px;
}

#nav-hamburger {
  display: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text);
  padding: 4px;
  margin-left: auto;
  line-height: 1;
}


#nav-mobile {
  display: none;
  position: sticky;
  top: var(--nav-height);
  z-index: 99;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-nav);
  flex-direction: column;
}

#nav-toggle:checked ~ #nav-mobile {
  display: flex;
}

#nav-hamburger::before {
    content: '☰';
  }
  
  #nav-toggle-mob:checked ~ nav #nav-hamburger::before {
    content: '✕';
  }

.nav-mobile-link {
  padding: 14px 24px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border-nav);
  transition: background 0.1s;
}

.nav-mobile-link:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}


#subjects {
  padding-bottom: var(--section-gap);
}

.subject {
  border-bottom: 1px solid var(--color-border-nav);
  padding: var(--section-gap) 16px;
  max-width: var(--content-max);
  margin: 0 auto;
}

.subject-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.subject--flip .subject-inner {
  grid-template-columns: 1fr;
}

.subject--flip .subject-text {
  order: 1;
}

.subject--flip .subject-image {
  order: 2;
}


.subject-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.subject-index {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--color-text-dim);
  letter-spacing: 0.1em;
}

.subject-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.subject-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 100%;
}

.subject-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 3px;
  width: fit-content;
  transition: opacity 0.15s;
}

.subject-link:hover {
  opacity: 0.5;
}

.link-arrow {
  transition: transform 0.2s;
}

.subject-link:hover .link-arrow {
  transform: translateX(4px);
}


.subject-image a {
  display: block;
  overflow: hidden;
  border: 1px solid var(--color-border-nav);
}

.subject-image a + a {
  margin-top: 16px;
}

.subject-image img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.subject-image a:hover img {
  transform: scale(1.03);
}

@keyframes reveal-up {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  animation: reveal-up linear both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

.subject-image.reveal {
  animation-range: entry 5% entry 35%;
}

.subject--flip .subject-text.reveal {
  animation-range: entry 5% entry 35%;
}

.subject--flip .subject-image.reveal {
  animation-range: entry 0% entry 30%;
}

.fchyena-link {
  text-decoration: underline;
}

.fchyena-link:hover {
  opacity: 0.5;
}

#nav-links {
  display: none;
}

#nav-hamburger {
  display: block;
}

@media (min-width: 480px) {
  :root {
    --section-gap: 72px;
  }

  #nav {
    padding: 0 24px;
  }

  .subject {
    padding: var(--section-gap) 24px;
  }

}

@media (min-width: 768px) {
  :root {
    --section-gap: 96px;
  }

  #nav-links {
    display: flex;
  }

  #nav-hamburger {
    display: none;
  }

  #nav {
    padding: 0 40px;
  }


  .subject {
    padding: var(--section-gap) 40px;
  }

  .subject-inner {
    grid-template-columns: 1fr 1.4fr;
    gap: 60px;
  }

  .subject--flip .subject-inner {
    grid-template-columns: 1.4fr 1fr;
  }

  .subject--flip .subject-text {
    order: 2;
  }

  .subject--flip .subject-image {
    order: 1;
  }

  .subject-desc {
    max-width: 380px;
  }

}

@media (min-width: 1100px) {
  :root {
    --section-gap: 56px;
  }

  .subject {
    padding: var(--section-gap) 0;
  }

}


@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .subject-image img {
    transition: none;
  }

  .link-arrow {
    transition: none;
  }
}