/* Mobile-First Design Overhaul */
/* Inspired by architectural bureau aesthetic */

/* Hide mobile UI by default (desktop-first) */
.mobile-header,
.mobile-hero,
.mobile-projects,
.mobile-about,
.mobile-footer,
.mobile-scroll-indicator {
  display: none !important;
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-black);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-content {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
  box-sizing: border-box;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.mobile-nav-time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-off-white);
  opacity: 0.8;
}

.mobile-nav-close {
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-off-white);
  background: none;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.5rem 0;
}

.mobile-nav-menu {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
}

.mobile-nav-item {
  font-family: var(--font-primary);
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-off-white);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  transition: all 0.3s ease;
}

.mobile-nav-item::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-off-white);
  transition: width 0.3s ease;
}

.mobile-nav-item:hover::after {
  width: 100%;
}

.mobile-nav-footer {
  display: flex;
  justify-content: center;
  gap: 2rem;
  width: 100%;
}

.mobile-nav-social {
  font-family: var(--font-primary);
  font-size: 0.875rem;
  color: var(--color-off-white);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.mobile-nav-social:hover {
  opacity: 1;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-black);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.5rem 0;
}

/* Mobile Header */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-off-white);
  z-index: 100;
  padding: 1rem 2rem;
  box-sizing: border-box;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.mobile-header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.mobile-header-time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-black);
  opacity: 0.8;
}

.mobile-header-title {
  font-family: var(--font-primary);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-black);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Mobile Hero Section */
.mobile-hero {
  padding: 8rem 2rem 4rem;
  background-color: transparent;
  /* min-height: 100vh; */
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.mobile-hero-content {
  max-width: 100%;
}

.mobile-hero-title {
  font-family: var(--font-primary);
  font-size: 3rem;
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.mobile-hero-text {
  font-family: var(--font-primary);
  font-size: 1.25rem;
  line-height: 1.6;
  margin-bottom: 3rem;
  text-transform: uppercase;
  font-weight: 500;
}

.mobile-hero-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  object-position: center;
  margin: 2rem 0;
  border-radius: 8px;
}

/* Mobile Projects Section */
.mobile-projects {
  padding: 4rem 2rem;
  background-color: transparent;
  color: var(--color-black);
}

/* Mobile filter chips */
.mobile-filter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.mobile-filter-chips {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.mobile-chip {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid rgba(0, 0, 0, 0.25);
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(255, 255, 255, 0.6);
  color: var(--color-black);
  cursor: pointer;
  transition: all 0.2s ease;
}

.mobile-chip.active {
  background: var(--color-black);
  color: var(--color-off-white);
  border-color: var(--color-black);
}

.mobile-filter-clear {
  flex: 0 0 auto;
  font-family: var(--font-primary);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  background: transparent;
  color: var(--color-black);
  opacity: 0.6;
}

body.dark-mode .mobile-chip { border-color: rgba(255,255,255,0.35); background: rgba(0,0,0,0.2); color: var(--color-off-white); }
body.dark-mode .mobile-chip.active { background: var(--color-off-white); color: #121212; border-color: var(--color-off-white); }

.mobile-projects-header {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 3rem;
  text-align: center;
}

.mobile-projects-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.mobile-project-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 2rem;
}

.mobile-project-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  opacity: 0.6;
  margin-bottom: 0.5rem;
}

.mobile-project-title {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-black);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.3;
  margin-bottom: 1rem;
  display: block;
}

.mobile-project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.mobile-project-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-black);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.mobile-project-description {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  opacity: 0.8;
}

/* Mobile About Section */
.mobile-about {
  padding: 4rem 2rem;
  background-color: transparent;
  color: var(--color-black);
}

.mobile-about-content {
  max-width: 100%;
}

.mobile-about-title {
  font-family: var(--font-primary);
  font-size: 2rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}

.mobile-about-text {
  font-family: var(--font-primary);
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: 3rem;
}

.mobile-about-grid {
  display: grid;
  gap: 2rem;
}

.mobile-about-column h3 {
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.mobile-about-column p {
  font-family: var(--font-primary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.mobile-about-column a {
  color: var(--color-black);
  text-decoration: underline;
}

/* Mobile Footer */
.mobile-footer {
  padding: 2rem;
  background-color: var(--color-black);
  color: var(--color-off-white);
  text-align: center;
}

.mobile-footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.mobile-footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  opacity: 0.7;
}

.mobile-footer-social {
  display: flex;
  gap: 1rem;
}

.mobile-footer-social a {
  font-family: var(--font-primary);
  font-size: 0.875rem;
  color: var(--color-off-white);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}

.mobile-footer-social a:hover {
  opacity: 1;
}

/* Mobile Scroll Indicator */
.mobile-scroll-indicator {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--color-black);
  color: var(--color-off-white);
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 50;
}

/* Mobile background layer (global; hidden on desktop via z-index layering) */
.mobile-hero-bg {
  display: none;
}

.mobile-scroll-indicator:hover {
  opacity: 1;
}

/* Mobile-specific animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-fade-in {
  animation: fadeInUp 0.6s ease-out;
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
  .mobile-header,
  .mobile-menu-toggle,
  .mobile-hero,
  .mobile-projects,
  .mobile-about,
  .mobile-footer {
    display: block !important;
    position: relative;
    z-index: 1; /* keep content above mobile-hero-bg */
  }
  .mobile-scroll-indicator {
    display: flex !important;
  }
  
  .mobile-nav-item {
    font-size: 2rem;
  }
  
  .mobile-hero-title {
    font-size: 2.5rem;
  }
  
  .mobile-hero-text {
    font-size: 1.125rem;
  }

  /* Background behind mobile index dropdown */
  .mobile-projects {
    position: relative;
    overflow: hidden;
  }

  .mobile-hero-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-size: cover;
    background-position: center;
    z-index: 0; /* Above body background, below content */
    opacity: 0.1;
    transition: background-image 0.3s ease, opacity 0.3s ease;
    display: block;
  }
}

@media (max-width: 480px) {
  .mobile-nav-item {
    font-size: 1.75rem;
  }
  
  .mobile-hero-title {
    font-size: 2rem;
  }
  
  .mobile-hero-text {
    font-size: 1rem;
  }
  
  .mobile-project-title {
    font-size: 1.25rem;
  }
  
  .mobile-about-title {
    font-size: 1.5rem;
  }
}

/* Hide desktop elements on mobile */
@media (max-width: 768px) {
  header,
  .hero,
  .all-projects,
  .about-footer,
  footer {
    display: none;
  }
  
  body {
    padding-top: 0;
  }
}