/* =============================================
   UPSTAIRS.AMSTERDAM - v2
   ============================================= */

@font-face {
  font-family: 'G2Erika';
  src: url('../assets/fonts/G2Erika-Medium.woff') format('woff');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

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

:root {
  --color-black: #1d1d1b;
  --color-green: #5AC53A;
  --color-white: #ffffff;
  --color-off-white: #f8f8f6;
  --color-grey: #999;
  --color-light-grey: #e8e8e6;
  --font-brand: 'G2Erika', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-body: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-black);
  background: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-light-grey);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.site-nav.scrolled {
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.nav-logo svg {
  height: 36px;
  width: auto;
  display: block;
  fill: var(--color-black);
  transition: opacity 0.2s ease;
}

.nav-logo:hover svg {
  opacity: 0.6;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-brand);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-black);
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.2s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-green);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover {
  color: var(--color-green);
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-social a {
  display: flex;
  align-items: center;
  opacity: 0.5;
  transition: opacity 0.2s ease;
}

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

.nav-social img {
  width: 18px;
  height: 18px;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-black);
  margin: 6px 0;
  transition: all 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* --- Mobile Menu (hidden on desktop) --- */
.mobile-menu {
  display: none;
}

/* --- Page Layout --- */
.page-content {
  padding-top: var(--nav-height);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

/* --- Hero --- */
.hero {
  min-height: min(calc(100vh - var(--nav-height)), 700px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem;
  position: relative;
}

.hero-content {
  max-width: 800px;
}

.hero-logo {
  width: 60%;
  max-width: 420px;
  margin: 0 auto 3rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s ease 0.2s forwards;
}

.hero-tagline {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-grey);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s ease 0.5s forwards;
}

.hero-location {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-grey);
  letter-spacing: 0.05em;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s ease 0.7s forwards;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  animation: fadeUpCentered 1s ease 1s forwards;
}

@keyframes fadeUpCentered {
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.hero-scroll a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-grey);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: color 0.2s ease;
}

.hero-scroll a:hover {
  color: var(--color-green);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-light-grey);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-green);
  animation: scrollDown 2s ease infinite;
}

@keyframes scrollDown {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 1rem;
  display: block;
}

.section-title {
  font-family: var(--font-brand);
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--color-black);
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-grey);
  margin-top: 1rem;
  font-weight: 300;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- About Preview (Home) --- */
.about-preview {
  background: var(--color-off-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-image {
  aspect-ratio: 4/5;
  overflow: hidden;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.about-image:hover img {
  transform: scale(1.03);
}

.about-text h2 {
  font-family: var(--font-brand);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  line-height: 1.3;
}

.about-text p {
  font-size: 1rem;
  line-height: 1.8;
  color: #555;
  margin-bottom: 1rem;
}

.about-text .btn {
  margin-top: 1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-brand);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.9rem 2.2rem;
  border: 1.5px solid var(--color-black);
  color: var(--color-black);
  transition: all 0.3s ease;
  cursor: pointer;
  background: transparent;
}

.btn:hover {
  background: var(--color-black);
  color: var(--color-white);
}

.btn--green {
  border-color: var(--color-green);
  color: var(--color-green);
}

.btn--green:hover {
  background: var(--color-green);
  color: var(--color-white);
}

/* --- Event Card (Home) --- */
.event-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--color-white);
  border: 1px solid var(--color-light-grey);
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.event-card:hover {
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.08);
}

.event-card-image {
  aspect-ratio: 1;
  overflow: hidden;
}

.event-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.event-card:hover .event-card-image img {
  transform: scale(1.05);
}

.event-card-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 3rem;
}

.event-card-date {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 1rem;
}

.event-card-title {
  font-family: var(--font-brand);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.event-card-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #555;
  margin-bottom: 1.5rem;
}

/* --- Exhibition Page --- */
.exhibition-hero {
  padding: 6rem 0 4rem;
  text-align: center;
}

.exhibition-hero .section-label {
  margin-bottom: 1.5rem;
}

.exhibition-hero h1 {
  font-family: var(--font-brand);
  font-size: 2.8rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.exhibition-meta {
  font-size: 0.9rem;
  color: var(--color-grey);
  letter-spacing: 0.05em;
}

.exhibition-meta span {
  margin: 0 0.75rem;
  opacity: 0.4;
}

.exhibition-intro {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.exhibition-intro p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: #444;
  margin-bottom: 1.5rem;
  text-align: center;
}

/* --- Artists List --- */
.artists-section {
  background: var(--color-off-white);
  padding: 5rem 0;
}

.artists-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  max-width: 800px;
  margin: 0 auto;
}

.artist-name {
  font-family: var(--font-brand);
  font-size: 0.95rem;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--color-light-grey);
  transition: color 0.2s ease;
}

.artist-name:hover {
  color: var(--color-green);
}

/* --- Gallery --- */
.gallery-section {
  padding: 5rem 0;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.gallery-item {
  aspect-ratio: 1;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

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

.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0);
  transition: background 0.3s ease;
}

.gallery-item:hover::after {
  background: rgba(0, 0, 0, 0.1);
}

.gallery-item:hover img {
  transform: scale(1.08);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  transform: scale(0.95);
  transition: transform 0.3s ease;
}

.lightbox.active .lightbox-img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  background: none;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s ease;
  font-family: var(--font-body);
  font-weight: 200;
  line-height: 1;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: white;
  font-size: 2.5rem;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.2s ease;
  padding: 1rem;
  font-family: var(--font-body);
  font-weight: 200;
}

.lightbox-nav:hover {
  opacity: 1;
}

.lightbox-prev {
  left: 1rem;
}

.lightbox-next {
  right: 1rem;
}

.lightbox-counter {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
}

/* --- About Page --- */
.about-hero {
  padding: 6rem 0 3rem;
  text-align: center;
}

.about-hero h1 {
  font-family: var(--font-brand);
  font-size: 2.8rem;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding: 3rem 0 5rem;
  align-items: start;
}

.about-content-text p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: #444;
  margin-bottom: 1.5rem;
}

.about-content-image {
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
}

.about-content-image img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
}

.location-section {
  background: var(--color-off-white);
  padding: 5rem 0;
}

.location-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.location-info h3 {
  font-family: var(--font-brand);
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
}

.location-info p {
  font-size: 1rem;
  line-height: 1.8;
  color: #555;
  margin-bottom: 1rem;
}

.location-address {
  font-style: normal;
  font-size: 1rem;
  line-height: 1.8;
  color: #555;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-light-grey);
}

.location-map {
  aspect-ratio: 16/10;
  background: var(--color-light-grey);
  overflow: hidden;
}

.location-map iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 4rem 0 2rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 3rem;
  align-items: start;
}

.footer-brand svg {
  height: 22px;
  fill: var(--color-white);
  margin-bottom: 1rem;
}

.footer-brand p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.6;
}

.footer-nav {
  text-align: center;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.footer-nav a {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s ease;
}

.footer-nav a:hover {
  color: var(--color-green);
}

.footer-social {
  display: flex;
  gap: 1.25rem;
  justify-content: flex-end;
}

.footer-social a {
  opacity: 0.4;
  transition: opacity 0.2s ease;
}

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

.footer-social img {
  width: 20px;
  height: 20px;
  filter: brightness(0) invert(1);
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.25);
  letter-spacing: 0.1em;
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Events Page --- */
.events-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.events-hero {
  padding: 6rem 0 3rem;
  text-align: center;
}

.events-hero h1 {
  font-family: var(--font-brand);
  font-size: 2.8rem;
}

/* --- Divider --- */
.divider {
  width: 40px;
  height: 1.5px;
  background: var(--color-green);
  margin: 0 auto;
}

/* --- Responsive --- */
@media (max-width: 968px) {
  .about-grid,
  .about-content,
  .location-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-image {
    aspect-ratio: 16/9;
  }

  .event-card {
    grid-template-columns: 1fr;
  }

  .event-card-image {
    aspect-ratio: 16/9;
  }

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .artists-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .footer-nav ul {
    justify-content: center;
  }

  .footer-social {
    justify-content: center;
  }

  .about-content-image {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .nav-links,
  .nav-social-desktop {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  /* Mobile menu */
  .mobile-menu {
    position: fixed;
    inset: 0;
    background: var(--color-white);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  .mobile-menu.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .mobile-menu a {
    font-family: var(--font-brand);
    font-size: 1.4rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-black);
    transition: color 0.2s ease;
  }

  .mobile-menu a:hover {
    color: var(--color-green);
  }

  .mobile-menu-social {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
  }

  .mobile-menu-social img {
    width: 22px;
    height: 22px;
  }

  section {
    padding: 3.5rem 0;
  }

  .hero {
    min-height: calc(100vh - 60px);
    padding: 3rem 1.5rem;
  }

  .hero-logo {
    max-width: 320px;
  }

  .section-title,
  .exhibition-hero h1,
  .about-hero h1,
  .events-hero h1 {
    font-size: 1.8rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }

  .artists-grid {
    grid-template-columns: 1fr;
  }

  .event-card-content {
    padding: 2rem;
  }

  .container {
    padding: 0 1.25rem;
  }

  .lightbox-nav {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero-logo {
    max-width: 260px;
  }

  .hero-tagline {
    font-size: 0.9rem;
  }

  .gallery-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3px;
  }
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-black: #f0f0ee;
    --color-white: #1a1a1a;
    --color-off-white: #222;
    --color-light-grey: #333;
  }

  .site-nav {
    background: rgba(26, 26, 26, 0.97);
  }

  .site-nav.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.3);
  }

  .about-text p,
  .event-card-desc,
  .location-info p,
  .location-address,
  .about-content-text p,
  .exhibition-intro p {
    color: #aaa;
  }

  .event-card:hover {
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
  }

  .nav-social img,
  .mobile-menu-social img {
    filter: brightness(0) invert(1);
  }

  .site-footer {
    background: #111;
  }

  .hero-logo {
    filter: brightness(0) invert(1);
  }

  .nav-toggle span {
    height: 2.5px;
    background: #fff;
  }
}