/* ==========================================================================
   BvO — Art Website Stylesheet
   Design: Japanese minimalism × Sotheby's luxury gallery
   Palette: Wabi-sabi earth tones, negative space, refined typography
   ========================================================================== */

/* ── CSS Variables ── */
:root {
  --bg-primary: #fafaf9;
  --bg-secondary: #f5f5f4;
  --bg-surface: #ffffff;
  --text-primary: #1c1917;
  --text-secondary: #5c5247;
  --text-muted: #8a8176;
  --accent: #8b7d6b;
  --accent-light: #d6cfc1;
  --border: #e7e5e4;
  --border-light: #f3f2f1;
  --shadow: 0 4px 20px -4px rgba(28, 25, 23, 0.06);
  --shadow-hover: 0 8px 30px -6px rgba(28, 25, 23, 0.1);
  --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  --font-serif: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'M PLUS 1p', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.75rem, 3vw + 1rem, 3rem);
}

h2.section-title {
  font-size: clamp(1.75rem, 3vw + 1rem, 3rem);
  text-align: center;
  margin-bottom: 0.75rem;
}

p {
  font-size: clamp(1rem, 1vw + 0.875rem, 1.125rem);
  color: var(--text-secondary);
}

sup {
  font-size: 0.6em;
  vertical-align: super;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ── Layout ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: clamp(4rem, 8vw, 8rem) 0;
}

/* ── Language Switcher ── */
.lang-switcher {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  gap: 0.75rem;
  z-index: 1000;
}

.lang-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.lang-btn.active {
  border-color: var(--text-primary);
  background: var(--text-primary);
  color: var(--bg-surface);
}

/* ── Header / Hero ── */
header.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(250, 250, 249, 0.8), transparent);
  backdrop-filter: blur(10px);
}

.logo {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.03em;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: var(--transition);
}

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

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 2rem;
  max-width: 800px;
}

.hero-title {
  margin-bottom: 1.25rem;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 60ch;
  line-height: 1.6;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--text-primary);
  color: var(--bg-surface);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: var(--transition);
  width: fit-content;
}

.cta-button:hover {
  background: var(--accent);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ── About Section ── */
.about {
  background: var(--bg-secondary);
}

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

.about-text h2 {
  margin-bottom: 1.5rem;
}

.about-text p {
  margin-bottom: 1.25rem;
}

.about-highlights {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.highlight {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.highlight-number {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.highlight-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.about-image {
  position: relative;
}

.artist-photo {
  width: 100%;
  height: auto;
  border-radius: 0;
  display: block;
  filter: grayscale(20%);
  transition: var(--transition);
}

.artist-photo:hover {
  filter: grayscale(0%);
}

.image-caption {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ── Gallery Section ── */
.gallery {
  background: var(--bg-primary);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.gallery-item {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  cursor: pointer;
}

.gallery-image {
  position: relative;
  width: 100%;
  height: 100%;
}

.gallery-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover .gallery-image img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--bg-surface);
  margin-bottom: 0.25rem;
  transform: translateY(20px);
  transition: var(--transition);
}

.gallery-item:hover .gallery-title {
  transform: translateY(0);
}

.gallery-price {
  font-size: 0.875rem;
  color: var(--accent-light);
  margin-bottom: 1rem;
  transform: translateY(20px);
  transition: var(--transition) 0.2s;
}

.gallery-item:hover .gallery-price {
  transform: translateY(0);
  transition-delay: 0.1s;
}

.gallery-view {
  background: transparent;
  border: 1px solid var(--bg-surface);
  color: var(--bg-surface);
  padding: 0.625rem 1.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: var(--transition);
  transform: translateY(20px);
  opacity: 0;
}

.gallery-item:hover .gallery-view {
  transform: translateY(0);
  opacity: 1;
  transition-delay: 0.2s;
}

.gallery-view:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--bg-surface);
}

/* ── Palitos Collection ── */
.collection {
  background: var(--bg-secondary);
}

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

.collection-text h2 {
  margin-bottom: 1.5rem;
}

.collection-text p {
  margin-bottom: 1.25rem;
}

.collection-image {
  position: relative;
}

.palitos-hero {
  width: 100%;
  height: auto;
  border-radius: 0;
  filter: grayscale(15%);
  transition: var(--transition);
}

.palitos-hero:hover {
  filter: grayscale(0%);
}

/* ── Contact Section ── */
.contact {
  background: var(--bg-primary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: flex-start;
}

.contact-info h2 {
  margin-bottom: 1rem;
}

.contact-info p {
  margin-bottom: 2rem;
  max-width: 400px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.contact-value {
  font-size: 1rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.contact-value:hover {
  color: var(--accent);
}

.contact-form {
  background: var(--bg-surface);
  padding: 2.5rem;
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: var(--transition);
  border-radius: 0;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--text-primary);
}

.submit-button {
  display: inline-flex;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--text-primary);
  color: var(--bg-surface);
  border: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.submit-button:hover {
  background: var(--accent);
  color: var(--text-primary);
}

/* ── Footer ── */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 3rem 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.footer-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 1.5rem;
}

.footer-social a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.footer-social a:hover {
  color: var(--accent);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .about-content,
  .collection-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

  .hero-content {
    padding: 3rem 1.5rem;
  }

  .lang-switcher {
    top: 1rem;
    right: 1rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  .contact-form {
    padding: 1.5rem;
  }
}

/* ── Utility ── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}