/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* Typography */
  --font-display: 'Roboto Condensed', 'Helvetica Neue', sans-serif;
  --font-body: 'Roboto Condensed', 'Helvetica Neue', sans-serif;
  --font-reading: 'Roboto', 'Helvetica Neue', sans-serif;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing */
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Monochrome palette */
  --color-bg: #000000;
  --color-text: #ffffff;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Slider */
  --slider-transition: 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================
   APP SHELL
   ============================================ */
#app {
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
  position: relative;
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-4) var(--space-6);
  pointer-events: none;
  opacity: 0;
}

.header.visible {
  animation: fadeIn 2s ease forwards;
}

.header.visible > * {
  pointer-events: auto;
}

.header__content {
  display: flex;
  flex-direction: column;
}

.header__logo-link {
  display: block;
  cursor: pointer;
}

.header__logo-img {
  width: clamp(72px, 8vw, 124px);
  height: clamp(72px, 8vw, 124px);
  display: block;
  object-fit: contain;
  filter: drop-shadow(8px 8px 19px rgba(0, 0, 0, 0.85));
}

/* ============================================
   SOCIAL LINKS
   ============================================ */
.social-links {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 91;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  opacity: 0;
  pointer-events: none;
}

.social-links.visible {
  animation: fadeIn 2s ease forwards;
  pointer-events: auto;
}

.social-links__item {
  display: block;
  width: 24px;
  height: 24px;
  opacity: 0.8;
  transition: opacity var(--transition-interactive);
}

.social-links__item:hover {
  opacity: 1;
}

.social-links__item img {
  width: 24px;
  height: 24px;
  display: block;
}

/* ============================================
   INFO DRAWER
   ============================================ */
.drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: 89;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 400ms ease;
}

.drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 40vw;
  z-index: 90;
  background: #111111;
  transform: translateX(100%);
  transition: transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
  padding: var(--space-8);
  overflow-y: auto;
}

.drawer.open {
  transform: translateX(0);
}

/* Close button — fixed at exact hamburger position */
.drawer-close {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 92;
  width: 24px;
  height: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  /* no transition here = instant hide on close */
}

.drawer-close.visible {
  opacity: 0.8;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 300ms ease; /* fade-in only */
}

.drawer-close:hover {
  opacity: 1;
}

.drawer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: calc(var(--space-6) - var(--space-8));
  padding-bottom: var(--space-4);
}

.drawer__ig {
  display: block;
  width: 24px;
  height: 24px;
  opacity: 0.8;
  transition: opacity var(--transition-interactive);
}

.drawer__ig:hover {
  opacity: 1;
}

.drawer__ig img {
  width: 24px;
  height: 24px;
  display: block;
}

.drawer__content {
  padding-top: var(--space-16);
  padding-bottom: var(--space-24);
}

.drawer__heading {
  font-family: 'Roboto Mono', monospace;
  font-size: var(--text-xl);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: #fff;
  margin-bottom: var(--space-6);
  line-height: 1.2;
}

.drawer__text {
  font-family: 'Roboto Mono', monospace;
  font-size: clamp(1rem, 0.8rem + 1.25vw, 1.25rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  max-width: 55ch;
}

.drawer__link {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: opacity var(--transition-interactive);
}

.drawer__link:hover {
  opacity: 0.75;
}

/* ============================================
   HORIZONTAL ACCORDION SLIDER
   ============================================ */
.slider {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  overflow: hidden;
}

.slider__panel {
  position: relative;
  flex: 1;
  min-width: 0;
  cursor: pointer;
  overflow: hidden;
  transition: flex var(--slider-transition);
  border-right: 1px solid rgba(255,255,255,0.06);
}

.slider__panel:last-of-type {
  border-right: none;
}

/* Expanded panel takes up much more space */
.slider__panel.active {
  flex: 6;
}

/* Background layer */
.slider__panel-bg {
  position: absolute;
  inset: -10px;
  background-size: cover;
  background-position: center;
  transition: transform 8s ease-out;
}

.slider__panel.active .slider__panel-bg {
  transform: scale(1.05);
}

/* Dark overlay */
.slider__panel-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  transition: background var(--slider-transition);
}

.slider__panel.active .slider__panel-overlay {
  background: rgba(0,0,0,0.15);
}

/* Vertical label shown when collapsed */
.slider__panel-label {
  position: absolute;
  bottom: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(50%) rotate(-90deg);
  white-space: nowrap;
  font-family: 'Roboto Mono', monospace;
  font-size: var(--text-sm);
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: lowercase;
  color: rgba(255,255,255,0.7);
  transition: opacity 400ms ease;
  pointer-events: none;
}

.slider__panel.active .slider__panel-label {
  opacity: 0;
}

/* Content shown when expanded */
.slider__panel-content {
  position: absolute;
  bottom: var(--space-24);
  left: var(--space-8);
  right: var(--space-8);
  z-index: 5;
  opacity: 0;
  transform: translateY(20px);
  /* No transition by default: when a panel deactivates, the text
     hides instantly instead of doing a buggy delayed fade-out. */
  pointer-events: none;
}

.slider__panel.active .slider__panel-content {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  /* Fade/slide in only when the panel becomes active. */
  transition:
    opacity 500ms ease 200ms,
    transform 500ms var(--ease-out) 200ms;
}

.slider__panel-title {
  font-family: 'Roboto Mono', monospace;
  font-size: var(--text-3xl);
  font-weight: 300;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 0.3em;
}

.slider__panel-subtitle {
  font-family: 'Roboto Mono', monospace;
  font-size: var(--text-base);
  font-weight: 300;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  color: rgba(255,255,255,0.7);
  line-height: 1.4;
}

/* Dynamic legibility: when the active panel's image (under the soft 0.15
   dim) is bright, switch text + label to dark. Inactive panels keep the
   strong 0.55 dim, so white stays readable there — no override needed. */
.slider__panel.active.is-bg-light .slider__panel-title {
  color: #111;
}
.slider__panel.active.is-bg-light .slider__panel-subtitle {
  color: rgba(0, 0, 0, 0.7);
}
.slider__panel.is-bg-light .slider__panel-label {
  color: rgba(0, 0, 0, 0.7);
}
.slider__panel.active.is-bg-light .city-overlay__item {
  color: rgba(0, 0, 0, 0.85);
}

/* ============================================
   SLIDER NAVIGATION ARROWS
   ============================================ */
.slider__nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 75;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  border-radius: 50%;
  transition: color 300ms ease, background 300ms ease;
  opacity: 0;
  pointer-events: none;
}

.slider__nav.visible {
  animation: fadeIn 2s ease forwards;
  pointer-events: auto;
}

.slider__nav:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.slider__nav--prev {
  left: var(--space-4);
}

.slider__nav--next {
  right: var(--space-4);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 70;
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-reading);
  font-size: 0.75rem;
  font-weight: 100;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  color: #ffffff;
  opacity: 0;
  pointer-events: none;
}

.footer.visible {
  animation: fadeIn 2s ease forwards;
  pointer-events: auto;
}

/* ============================================
   KEYFRAMES
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ============================================
   CITY OVERLAY (active panel)
   ============================================ */
.city-overlay {
  position: absolute;
  top: 8px;
  right: 8px;
  bottom: 8px;
  width: calc(50% - 8px);
  z-index: 6;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1200ms ease;
  /* Soft fade at top & bottom edges */
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0,
    #000 12%,
    #000 88%,
    transparent 100%
  );
          mask-image: linear-gradient(
    to bottom,
    transparent 0,
    #000 12%,
    #000 88%,
    transparent 100%
  );
}

.city-overlay.is-visible {
  opacity: 1;
}

.city-overlay__track {
  display: flex;
  flex-direction: column;
  will-change: transform;
}

.city-overlay.is-scrolling .city-overlay__track {
  animation: cityScroll 90s linear infinite;
}

.city-overlay__item {
  font-family: var(--font-display);
  font-weight: 100;
  font-size: clamp(1.5rem, 1.25rem + 1.6vw, 3rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
  text-transform: lowercase;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
  text-align: right;
  padding-right: var(--space-4);
}

@keyframes cityScroll {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(0, -50%, 0); }
}

@keyframes cityScrollX {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-50%, 0, 0); }
}

@media (max-width: 768px) {
  /* Horizontal strip ~1/3 from the bottom on mobile. */
  .city-overlay {
    top: auto;
    left: 0;
    right: 0;
    bottom: 33%;
    width: auto;
    height: clamp(4.5rem, 12vh, 6rem);
    -webkit-mask-image: linear-gradient(
      to right,
      transparent 0,
      #000 10%,
      #000 90%,
      transparent 100%
    );
            mask-image: linear-gradient(
      to right,
      transparent 0,
      #000 10%,
      #000 90%,
      transparent 100%
    );
  }
  .city-overlay__track {
    flex-direction: row;
    align-items: center;
    height: 100%;
    width: max-content;
  }
  .city-overlay__item {
    font-size: 4rem;
    text-align: left;
    padding: 0 0.3em;
    flex: 0 0 auto;
  }
  .city-overlay.is-scrolling .city-overlay__track {
    animation: cityScrollX 280s linear infinite;
  }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .header__logo {
    font-size: var(--text-xl);
  }

  .slider__panel-title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 768px) {
  .header {
    padding: var(--space-4) var(--space-4);
  }

  .header__logo {
    font-size: var(--text-xl);
  }

  /* Stack panels vertically on mobile */
  .slider {
    flex-direction: column;
  }

  .slider__panel {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .slider__panel:last-of-type {
    border-bottom: none;
  }

  .slider__panel-label {
    transform: translateX(-50%) translateY(50%) rotate(0deg);
    font-size: var(--text-xs);
  }

  .slider__panel-content {
    bottom: 64px;
    left: var(--space-4);
    right: var(--space-4);
  }

  .footer {
    padding: var(--space-4) var(--space-4);
  }

  .slider__panel-title {
    font-size: var(--text-xl);
  }

  .slider__nav {
    display: none;
  }

  .drawer {
    width: 80vw;
    padding: var(--space-6);
  }

  .drawer__heading {
    font-size: 1rem;
  }

  .drawer__text {
    font-size: 1rem;
    line-height: 1.5;
  }
}

@media (max-width: 480px) {
  .header__logo {
    font-size: var(--text-lg);
    letter-spacing: 0.05em;
  }

  .drawer__heading {
    font-size: 1rem;
  }

  .drawer__text {
    font-size: 1rem;
    line-height: 1.5;
  }
}