/* ===================================
   Alternative Computations 2026
   Exhibition Website Stylesheet
   =================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-black: #0a0a0a;
  --color-white: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e8e8e8;
  --color-gray-300: #d4d4d4;
  --color-gray-500: #737373;
  --color-gray-700: #404040;
  --color-gray-900: #171717;

  /* Typography */
  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif JP', 'Yu Mincho', serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Layout */
  --container-width: 1200px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-gray-900);
  background-color: var(--color-white);
}

/* Language Toggle - Hide inactive language */
body.lang-ja .en {
  display: none !important;
}

body.lang-en .ja {
  display: none !important;
}

/* Default to Japanese */
body:not(.lang-en) .en {
  display: none !important;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.4;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Section */
.section {
  padding: var(--space-3xl) 0;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xl);
  text-align: center;
  position: relative;
}

.section__title::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--color-gray-900);
  margin: var(--space-md) auto 0;
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-white);
  z-index: 1000;
  border-bottom: 1px solid var(--color-gray-200);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.header.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

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

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__links a {
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gray-900);
  transition: width var(--transition-base);
}

.nav__links a:hover::after {
  width: 100%;
}

.nav__lang {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lang-btn {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-gray-500);
  transition: color var(--transition-fast);
}

.lang-btn.active {
  color: var(--color-gray-900);
}

.lang-btn:hover {
  color: var(--color-gray-900);
}

.lang-divider {
  color: var(--color-gray-300);
  font-size: 0.75rem;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--color-gray-900);
  transition: all var(--transition-fast);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  z-index: 999;
  padding: var(--space-xl) var(--space-lg);
}

.mobile-menu.active {
  display: block;
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu__links a {
  font-size: 1.25rem;
  font-family: var(--font-serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  background: var(--color-gray-100);
  overflow: hidden;
}

.hero__visual {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.hero__image-container {
  width: 100%;
  height: 100%;
}

.hero__image-container picture {
  display: block;
  width: 100%;
  height: 100%;
}

.hero__placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl);
  max-width: 900px;
}

.hero__festival {
  font-size: 0.875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  color: var(--color-gray-700);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xl);
}

.hero__subtitle {
  display: block;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  margin-top: var(--space-sm);
  color: var(--color-gray-700);
}

.hero__info {
  margin-top: var(--space-lg);
}

.hero__date {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.hero__venue {
  font-size: 1rem;
  color: var(--color-gray-700);
  letter-spacing: 0.05em;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-gray-900), transparent);
  animation: scroll-hint 2s ease-in-out infinite;
}

@keyframes scroll-hint {
  0%, 100% {
    opacity: 0;
    transform: translateY(-10px);
  }
  50% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================
   Statement Section
   =================================== */
.statement {
  background: var(--color-white);
}

.statement__content {
  max-width: 800px;
  margin: 0 auto;
}

.statement__text {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 2;
}

.statement__lead {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--space-lg);
  text-align: center;
}

.statement__author {
  margin-top: var(--space-xl);
  text-align: right;
  font-size: 0.875rem;
  color: var(--color-gray-700);
}

/* Essay Toggle */
.statement__essay {
  margin-top: var(--space-2xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.essay-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: none;
  border: none;
  font-family: var(--font-serif);
  font-size: 1rem;
  cursor: pointer;
  padding: var(--space-md) 0;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
}

.essay-toggle:hover {
  color: var(--color-gray-900);
}

.essay-content {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-gray-200);
}

.essay-content[hidden] {
  display: none;
}

.essay-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 2;
}

.essay-text h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
  text-align: center;
}

.essay-text h4 {
  font-size: 1.125rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
}

.essay-author {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-gray-700);
}

.essay-lead {
  font-size: 1.25rem;
  font-weight: 500;
  text-align: center;
  margin-bottom: var(--space-lg);
}

/* ===================================
   Works Section
   =================================== */
.works {
  background: var(--color-gray-100);
}

.work {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--color-gray-300);
}

.work:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.work__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.work__title {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.work__title em {
  font-style: italic;
}

.work__artist {
  font-size: 1rem;
  color: var(--color-gray-700);
}

.work__details {
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.work__meta {
  font-size: 0.875rem;
  color: var(--color-gray-700);
}

.work__meta p {
  margin-bottom: var(--space-xs);
}

.work__description {
  max-width: 800px;
  margin: 0 auto;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 2;
}

.work__closing {
  margin-top: var(--space-lg);
  font-weight: 500;
}

.work__credits {
  max-width: 700px;
  margin: var(--space-xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-gray-300);
}

.work__credits h4 {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  text-align: center;
}

.credits-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-gray-700);
  padding: 0;
  margin: 0;
}

.credits-list li {
  margin-bottom: var(--space-xs);
}

/* ===================================
   Performances Section
   =================================== */
.performances {
  background: var(--color-white);
}

.performances__intro {
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
  text-align: center;
  font-family: var(--font-serif);
  font-size: 1.125rem;
}

.performance {
  max-width: 700px;
  margin: 0 auto var(--space-xl);
}

.performance__title {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.performance__duration {
  font-size: 0.875rem;
  color: var(--color-gray-700);
  margin-bottom: var(--space-lg);
}

.performance__schedule {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.schedule-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  font-size: 0.9375rem;
}

.schedule-date {
  font-weight: 500;
}

.performance__note {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  margin-top: var(--space-md);
}

.schedule-times {
  color: var(--color-gray-700);
}


/* ===================================
   Artists Section
   =================================== */
.artists {
  background: var(--color-gray-100);
}

.artist {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--color-gray-300);
}

.artist:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.artist__image {
  width: 560px;
  height: 560px;
  margin-bottom: var(--space-xl);
}

.artist__placeholder {
  width: 100%;
  height: 100%;
  background: var(--color-gray-300);
  border-radius: 2px;
}

.artist__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 2px;
}

.artist__name {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.artist__role {
  font-size: 0.875rem;
  color: var(--color-gray-700);
  margin-bottom: var(--space-lg);
}

.artist__bio {
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--color-gray-700);
}

.artist__bio p {
  margin-bottom: var(--space-md);
}

.artist__info {
  max-width: 700px;
}

.artist__links {
  margin-top: var(--space-lg);
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
}

.artist__links a {
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ===================================
   Information Section
   =================================== */
.information {
  background: var(--color-white);
}

.info-grid {
  max-width: 600px;
  margin: 0 auto;
}

.info-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-gray-200);
}

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

.info-item dt {
  font-weight: 500;
  font-size: 0.875rem;
}

.info-item dd {
  font-size: 0.9375rem;
}

/* ===================================
   Access Section
   =================================== */
.access {
  background: var(--color-gray-100);
}

.access__map {
  margin-bottom: var(--space-xl);
  border-radius: 2px;
  overflow: hidden;
}

.access__map iframe {
  display: block;
}

.access__map-link {
  display: block;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-gray-200);
  text-align: center;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-gray-900);
  transition: background 0.2s ease;
}

.access__map-link:hover {
  background: var(--color-gray-300);
}

.access__directions {
  text-align: center;
  font-size: 0.9375rem;
}

/* ===================================
   Credits Section
   =================================== */
.credits {
  background: var(--color-white);
}

.credits-grid {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-xl);
}

.credit-block {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9375rem;
}

.credit-block li {
  margin-bottom: var(--space-xs);
  color: var(--color-gray-700);
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--space-2xl) 0;
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.footer__title {
  text-align: center;
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--color-white);
}

.footer__credits {
  display: flex;
  gap: var(--space-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.footer__credits .credit-block {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
}

.footer__credits .credit-block li {
  color: var(--color-white);
}

.footer__contact {
  font-size: 0.875rem;
  color: var(--color-white);
}

.footer__contact a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-gray-500);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .artist__image {
    width: 480px;
    height: 480px;
  }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 5rem;
  }

  .section__title {
    font-size: 1.25rem;
  }

  .hero__content {
    padding: var(--space-lg);
  }

  .hero__title {
    font-size: 1.5rem;
  }

  .hero__subtitle {
    font-size: 1.125rem;
  }

  .statement__lead,
  .essay-lead {
    font-size: 1.25rem;
  }

  .artist__image {
    width: 400px;
    height: 400px;
  }

  .schedule-item {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .info-item {
    grid-template-columns: 80px 1fr;
  }

  .credit-block {
    padding: 0;
  }

  .footer__credits {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .footer__credits .credit-block li {
    color: var(--color-white);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .nav {
    padding: 0 var(--space-lg);
  }

  .hero__festival {
    font-size: 0.75rem;
  }

  .hero__date {
    font-size: 1rem;
  }

  .work__title {
    font-size: 1.25rem;
  }

  .artist__name {
    font-size: 1.25rem;
  }

  .artist__image {
    width: 320px;
    height: 320px;
  }
}

/* ===================================
   Animations & Transitions
   =================================== */
.section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Individual item animations */
.work,
.artist {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.work.visible,
.artist.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Smooth scroll offset for fixed header */
[id] {
  scroll-margin-top: calc(var(--header-height) + var(--space-lg));
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-gray-900);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .header,
  .hero__scroll,
  .nav__hamburger,
  .mobile-menu {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding-top: 0;
  }

  .section {
    opacity: 1;
    transform: none;
  }
}