/* ============================================================
   LIAM ROBERT DESIGN CO — styles-project.css (Case Study Pages)
   ============================================================ */

:root {
  --bg: #edecea;
  --white: #ffffff;
  --black: #111110;
  --grey: #8a8885;
  --light-grey: #d4d2cf;
  --page-margin: 26vw;
  --page-margin-md: 10vw;
  --page-margin-sm: 6vw;
  --font: Helvetica Neue, Helvetica, Arial, sans-serif;
  --nav-height: 72px;
  --easing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
  font-family: var(--font);
  font-weight: 500;
  background: var(--white);
  margin: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { opacity: 1; }

/* ============================================================
   PAGE HEADER (sticky)
   ============================================================ */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: var(--nav-height);
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-logo img {
  width: 130px;
  height: auto;
  display: block;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
}

.header-nav li { margin: 0; padding: 0; }

.header-nav a {
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grey);
  padding: 6px 14px;
  display: block;
  white-space: nowrap;
  transition: color 0.2s;
}

.header-nav a:hover { color: var(--black); }

.header-nav a.active {
  color: var(--black);
  text-decoration: underline;
  text-underline-offset: 5px;
}

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--black);
  flex-direction: column;
  gap: 5px;
  align-items: flex-end;
}

.nav-hamburger span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: width 0.2s, opacity 0.2s, transform 0.2s;
}

.nav-hamburger span:nth-child(1) { width: 22px; }
.nav-hamburger span:nth-child(2) { width: 16px; }
.nav-hamburger span:nth-child(3) { width: 22px; }

.nav-hamburger.open { color: var(--white); }
.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); width: 22px; }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); width: 22px; }

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--black);
  z-index: 9998;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  padding: 80px 40px 40px;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.nav-drawer.open { display: flex; opacity: 1; }

.nav-drawer ul { list-style: none; margin: 0; padding: 0; }
.nav-drawer ul li { margin-bottom: 4px; }

.nav-drawer ul a {
  font-family: var(--font);
  font-size: clamp(28px, 8vw, 48px);
  font-weight: 500;
  color: var(--white);
  letter-spacing: -0.01em;
  display: block;
  text-align: right;
  padding: 6px 0;
  transition: opacity 0.15s;
}

.nav-drawer ul a:hover,
.nav-drawer ul a.active { opacity: 0.4; }

.nav-drawer-footer {
  margin-top: auto;
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
}

/* ============================================================
   PROJECT TITLE
   ============================================================ */

.project-title {
  padding: 56px var(--page-margin) 32px;
}

.project-title h3 {
  font-family: var(--font);
  font-weight: 500;
  font-size: clamp(22px, 3vw, 36px);
  color: var(--black);
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.project-title p {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.75;
  font-weight: 500;
  color: var(--grey);
  max-width: 600px;
  margin: 0;
}

/* ============================================================
   HERO IMAGE — full-bleed, desktop only
   ============================================================ */

.project-hero {
  display: none;
}

.project-hero img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 4 / 1;
  object-fit: cover;
}

@media (min-width: 769px) {
  .project-hero { display: block; }
}

/* ============================================================
   IMAGE GRID — single column, NO overlay
   ============================================================ */

.image-grid-container { padding: 0; }

.image-grid {
  margin: 0 var(--page-margin);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: 80px;
}

.image-grid a {
  position: relative;
  display: block;
  overflow: hidden;
}

.image-grid img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s var(--easing);
}

.image-grid a:hover img { transform: scale(1.015); }

/* Overlay — visible by default, hidden on hover */
.overlay {
  display: flex;
  position: absolute;
  inset: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0) 55%);
  color: white;
  opacity: 0;
  flex-direction: column;
  justify-content: flex-end;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.image-grid a:hover .overlay { opacity: 1; }

.overlay h3 {
  margin: 0 0 4px;
  font-family: var(--font);
  font-weight: 500;
  font-size: 14px;
  color: #fff;
}

.overlay p {
  margin: 0;
  font-family: var(--font);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
}

/* ============================================================
   VIDEO PLAYER
   ============================================================ */

.video-wrap {
  margin: 0 var(--page-margin) 48px;
}

#vp {
  position: relative;
  width: 100%;
  background: #000;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* ============================================================
   FOOTER DESC
   ============================================================ */

.desc-paragraph {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 48px 40px;
  background-color: var(--white);
  border-top: 1px solid var(--light-grey);
  gap: 40px;
}

.desc-paragraph p {
  margin: 0;
  max-width: 480px;
  font-family: var(--font);
  font-size: clamp(15px, 1.6vw, 20px);
  font-weight: 500;
  line-height: 1.3;
  color: var(--black);
}

.desc-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: right;
}

.desc-nav ul li { line-height: 1.8; }

.desc-nav a {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
  transition: color 0.2s;
}

.desc-nav a:hover { color: var(--black); }

/* ============================================================
   FOOTER BOTTOM
   ============================================================ */

.footer-bottom {
  background: var(--bg);
  padding: 28px 40px;
}

.footer-bottom p {
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0;
}

.bullet { font-size: 0.5em; vertical-align: middle; }

/* ============================================================
   BREAKPOINTS
   ============================================================ */

@media (max-width: 1520px) {
  :root { --page-margin: var(--page-margin-md); }
}

@media (max-width: 900px) {
  :root { --page-margin: var(--page-margin-sm); }
}

/* ============================================================
   TABLET
   ============================================================ */

@media (max-width: 768px) {
  :root { --page-margin: 20px; }
  body { padding-top: 56px; }

  .header-nav { display: none; }
  .nav-hamburger { display: flex; }

  .page-header { position: fixed; top: 0; left: 0; right: 0; z-index: 9999; padding: 0 20px; height: 56px; }
  body:has(.nav-drawer.open) .page-header { background: transparent; }
  body:has(.nav-drawer.open) .header-logo { opacity: 0; }
  .header-logo img { width: 120px; }

  .project-title { padding: 36px 20px 20px; }

  .image-grid { margin: 0; padding-bottom: 48px; }

  .video-wrap { margin: 0 0 32px; }

  .desc-paragraph {
    flex-direction: column;
    gap: 20px;
    padding: 36px 20px;
  }

  .desc-nav ul { text-align: left; }
  .footer-bottom { padding: 24px 20px; }
}

/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 480px) {
  .project-title h3 { font-size: 22px; }
  .project-title p { font-size: 13px; }
  .desc-paragraph { padding: 28px 20px; }
  .footer-bottom { padding: 20px 20px; }
}