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

:root {
  --black: #1a1a1a;
  --white: #ffffff;
  --gray: #888888;
  --light-gray: #f5f5f5;
  --font-main: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  color: var(--black);
  background: #e8e5e0;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img {
  display: block;
  max-width: 100%;
  user-select: none;
  -webkit-user-select: none;
  pointer-events: auto;
}

/* ===== HEADER / NAV ===== */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: #e8e5e0;
  border-bottom: 1px solid #d4d0ca;
  padding: 0 40px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

nav { display: flex; gap: 32px; }

nav a {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  transition: color 0.2s;
}

nav a:hover, nav a.active { color: var(--gray); }

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--black);
  transition: all 0.3s;
}

/* ===== MAIN CONTENT ===== */
main { padding-top: 72px; min-height: 100vh; }

/* ===== HOME - PROJECT GRID ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  padding: 40px;
  max-width: 64%;
  margin: 0 auto;
}

.project-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/2;
  cursor: pointer;
}

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover img { transform: scale(1.03); }

.project-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  transition: background 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.project-card:hover .project-card-overlay { background: rgba(0,0,0,0.4); }

.project-card-title {
  color: var(--white);
  font-size: 86px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.3s;
  text-shadow: 0 2px 12px rgba(0,0,0,0.7);
}

.project-card:hover .project-card-title {
  opacity: 1;
  transform: translateY(0);
}

/* ===== PROJECT PAGE ===== */
.project-page { max-width: 900px; margin: 0 auto; padding: 60px 40px; }

.project-header { margin-bottom: 48px; }

.project-header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
  color: var(--black);
}

.project-header p {
  font-size: 18px;
  line-height: 1.8;
  color: #333;
  max-width: 100%;
}

/* Gallery grid */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3px;
}

.gallery-item {
  cursor: pointer;
  overflow: hidden;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 3/2;
  transition: transform 0.4s ease;
}

.gallery-item:hover img { transform: scale(1.02); }

/* ===== LIGHTBOX ===== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(255,255,255,255.95);
  align-items: center;
  justify-content: center;
}

.lightbox.open { display: flex; }

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 20px; right: 28px;
  color: black;
  font-size: 32px;
  cursor: pointer;
  background: none;
  border: none;
  line-height: 1;
}

.lightbox-prev, .lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: black;
  font-size: 42px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 16px;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.lightbox-prev:hover, .lightbox-next:hover { opacity: 1; }
.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }

/* ===== PROJECT NAV ===== */
.project-nav {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid #d4d0ca;
}

.project-nav-title {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 20px;
}

.project-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px 24px;
}

.project-nav-grid a {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--black);
  transition: color 0.2s;
}

.project-nav-grid a:hover { color: var(--gray); }

.project-nav-grid .current {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #aaa;
  cursor: default;
}

/* ===== BOOKS PAGE ===== */
.books-page { max-width: 900px; margin: 0 auto; padding: 60px 40px; }

.book-item {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 60px;
  margin-bottom: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid #e8e8e8;
  align-items: start;
}

.book-item:last-child { border-bottom: none; }

.book-info h2 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.book-publisher {
  font-size: 15px;
  color: var(--gray);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.book-info p {
  font-size: 17px;
  line-height: 1.8;
  color: #333;
  margin-bottom: 20px;
}

.book-specs {
  font-size: 15px;
  color: #555;
  line-height: 1.8;
  margin-bottom: 24px;
}

.book-link {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--black);
  padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}
.book-link:hover { color: var(--gray); border-color: var(--gray); }

.book-cover { width: 150%; }
.book-cover img { width: 100%; box-shadow: 0 4px 24px rgba(0,0,0,0.12); }

/* ===== CONTACTS PAGE ===== */
.contacts-page { max-width: 900px; margin: 0 auto; padding: 60px 40px; }

.contacts-hero { margin-bottom: 60px; }
.contacts-hero img { width: 100%; max-height: 500px; object-fit: cover; }

.contacts-content h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 40px;
}

.contact-form { max-width: 520px; }

.form-group { margin-bottom: 24px; }

.form-group label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  border: none;
  border-bottom: 1px solid #ccc;
  padding: 8px 0;
  font-family: var(--font-main);
  font-size: 14px;
  color: var(--black);
  background: transparent;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--black); }

.form-group textarea { resize: vertical; min-height: 120px; }

.form-submit {
  background: var(--black);
  color: var(--white);
  border: none;
  padding: 14px 40px;
  font-family: var(--font-main);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 8px;
}
.form-submit:hover { background: #444; }

/* ===== PAGE TRANSITIONS ===== */
.page { display: none; }
.page.active { display: block; }

/* ===== RESPONSIVE / MOBILE ===== */
@media (max-width: 768px) {
  header { padding: 0 20px; }

  nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: #e8e5e0;
    padding: 24px 20px;
    gap: 24px;
    border-bottom: 1px solid #d4d0ca;
    z-index: 99;
  }
  nav.open { display: flex; }
  .menu-toggle { display: flex; }

  /* Home grid: single column, full width */
  .projects-grid {
    grid-template-columns: 1fr;
    max-width: 100%;
    padding: 16px;
    gap: 16px;
  }

  /* Show title always on mobile */
  .project-card-title {
    opacity: 1;
    transform: none;
    font-size: 24px;
  }
  .project-card-overlay {
    background: rgba(0,0,0,0.3);
  }

  /* Project pages */
  .project-page, .books-page, .contacts-page { padding: 24px 16px; }

  .project-header h1 { font-size: 20px; }
  .project-header p { font-size: 15px; }

  /* Gallery: single column, full images no crop, no lightbox */
  .gallery {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .gallery-item {
    cursor: default;
    pointer-events: none;
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    object-fit: unset;
    aspect-ratio: unset;
  }

  /* Project nav grid: 2 columns on mobile */
  .project-nav-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 16px;
  }
  .project-nav-grid a,
  .project-nav-grid .current {
    font-size: 12px;
  }

  /* Books */
  .book-item { grid-template-columns: 1fr; gap: 24px; }
  .book-cover { order: -1; width: 100%; }
  .book-cover img { max-height: 280px; object-fit: contain; }
  .book-info h2 { font-size: 15px; }
  .book-info p { font-size: 14px; }

  /* Contacts */
  .contacts-hero img { max-height: 260px; object-fit: cover; }
  .contacts-content h2 { font-size: 16px; }
}