/* ============================================
   Nina Nevod
   Typography: EB Garamond (display) + Inter (body)
   Palette: white #FFFFFF / ink #1A1A1A / teal #1F5D6E
   ============================================ */

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

:root {
  --bg: #FFFFFF;
  --ink: #1A1A1A;
  --ink-muted: rgba(26, 26, 26, 0.58);
  --ink-faint: rgba(26, 26, 26, 0.16);
  --teal: #1F5D6E;
  --teal-hover: #2A7888;
  --max-width: 1280px;
  --rail-width: 260px;
  --gutter-desktop: 5rem;
  --pad-desktop: 4rem;
  --pad-mobile: 1.5rem;
  --font-display: 'EB Garamond Variable', Garamond, 'Adobe Garamond Pro', 'Times New Roman', serif;
  --font-body: 'Inter Variable', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* ============================================
   Mobile top bar
   ============================================ */
.mobile-bar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  padding: 1rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.mobile-bar .brand-mini {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.28s ease, opacity 0.2s ease;
  transform-origin: center;
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 15;
  padding: 5rem 2rem 2rem;
  transform: translateX(100%);
  transition: transform 0.32s cubic-bezier(0.32, 0.72, 0, 1);
}

.mobile-menu[aria-hidden="false"] {
  transform: translateX(0);
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mobile-menu .nav-link {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.mobile-menu .nav-link.active {
  color: var(--teal);
}

/* ============================================
   HOME PAGE
   ============================================ */
body.home .page {
  display: grid;
  grid-template-columns: minmax(0, max-content) minmax(0, 1fr);
  gap: 4rem;
  align-items: center;
  min-height: 100vh;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--pad-desktop);
}

body.home .brand-block {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

body.home .brand-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(3rem, 6.5vw, 5.25rem);
  line-height: 0.98;
  letter-spacing: -0.012em;
  color: var(--ink);
}

body.home nav.main-nav {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

body.home .nav-link {
  font-size: 1rem;
  letter-spacing: 0.012em;
  color: var(--ink);
  opacity: 0.65;
  width: fit-content;
  padding: 0.15rem 0;
}

body.home .nav-link:hover {
  opacity: 1;
  color: var(--teal);
}

body.home .photo-block {
  display: flex;
  justify-content: center;
  align-items: center;
}

body.home .photo-block img {
  width: 100%;
  max-width: 460px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

/* ============================================
   INTERNAL PAGES (About, Publications, Contact)
   ============================================ */
body.about .page,
body.publications .page,
body.contact .page {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  gap: var(--gutter-desktop);
  align-items: start;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--pad-desktop);
  min-height: 100vh;
}

.rail {
  display: flex;
  flex-direction: column;
  gap: 5.5rem;
  position: sticky;
  top: var(--pad-desktop);
}

.rail .brand-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.rail .brand-name:hover {
  color: var(--teal);
}

.rail nav.main-nav {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.rail .nav-link {
  font-size: 0.9375rem;
  letter-spacing: 0.012em;
  color: var(--ink);
  opacity: 0.65;
  width: fit-content;
  padding: 0.1rem 0;
}

.rail .nav-link:hover {
  opacity: 1;
  color: var(--teal);
}

.rail .nav-link.active {
  color: var(--teal);
  opacity: 1;
  font-weight: 500;
}

/* Main content area */
.content {
  max-width: 34rem;
  padding-top: 5.5rem;
}

.content h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.005em;
  margin-bottom: 2rem;
}

.content p {
  font-size: 1.0625rem;
  line-height: 1.72;
  margin-bottom: 1.25rem;
  color: var(--ink);
}

.content p:last-child {
  margin-bottom: 0;
}

/* ============================================
   PUBLICATIONS
   ============================================ */
.pub-section {
  margin-bottom: 3.5rem;
}

.pub-section:last-child {
  margin-bottom: 0;
}

.pub-section h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--ink-faint);
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pub-item {
  font-size: 1.0625rem;
  line-height: 1.6;
}

.pub-title {
  font-style: italic;
}

.pub-item a {
  color: var(--teal);
  border-bottom: 1px solid rgba(31, 93, 110, 0.28);
}

.pub-item a:hover {
  border-bottom-color: var(--teal);
}

.pub-venue {
  font-style: italic;
}

.pub-year {
  color: var(--ink-muted);
}

/* ============================================
   CONTACT FORM
   ============================================ */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 30rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-field label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
}

.form-field input,
.form-field textarea {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(26, 26, 26, 0.2);
  padding: 0.6rem 0;
  outline: none;
  width: 100%;
  transition: border-color 0.2s ease;
}

.form-field input:focus,
.form-field textarea:focus {
  border-bottom-color: var(--teal);
}

.form-field textarea {
  resize: vertical;
  min-height: 7.5rem;
  font-family: var(--font-body);
}

/* Honeypot — hidden from humans, visible to bots */
.honeypot {
  position: absolute;
  left: -9999px;
  top: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

.submit-btn {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  letter-spacing: 0.025em;
  background: var(--ink);
  color: var(--bg);
  border: none;
  padding: 0.95rem 2.25rem;
  align-self: flex-start;
  margin-top: 0.75rem;
  transition: background 0.22s ease;
}

.submit-btn:hover {
  background: var(--teal);
}

.form-success,
.form-error {
  font-size: 0.95rem;
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border-left: 2px solid;
}

.form-success {
  color: var(--teal);
  border-color: var(--teal);
  background: rgba(31, 93, 110, 0.04);
}

.form-error {
  color: #8C2D2D;
  border-color: #8C2D2D;
  background: rgba(140, 45, 45, 0.04);
}

.hidden {
  display: none !important;
}

/* ============================================
   MOBILE (max-width: 820px)
   ============================================ */
@media (max-width: 820px) {
  html {
    font-size: 16px;
  }

  .mobile-bar {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  /* HOME mobile */
  body.home .mobile-bar .brand-mini {
    display: none;
  }

  body.home .mobile-bar {
    justify-content: flex-end;
  }

  body.home .page {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 0 var(--pad-mobile) 3rem;
    min-height: calc(100vh - 64px);
    align-items: start;
  }

  body.home .brand-block .brand-name {
    text-align: center;
    margin-top: 1.5rem;
    font-size: clamp(2.8rem, 14vw, 4rem);
  }

  body.home nav.main-nav {
    display: none;
  }

  body.home .photo-block img {
    max-width: 100%;
  }

  /* INTERNAL mobile */
  body.about .page,
  body.publications .page,
  body.contact .page {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 2rem var(--pad-mobile) 3rem;
  }

  body.about .rail,
  body.publications .rail,
  body.contact .rail {
    display: none;
  }

  .content h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
  }

  .content {
    max-width: 100%;
    padding-top: 0;
  }
}

/* ============================================
   PREFERS-REDUCED-MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}