/* =========================================
   Mery Art House — Custom Styles
   Design tokens, animations, lightbox,
   and component styles
   ========================================= */

/* --- Design Tokens --- */
:root {
  --color-ivory: #FAF8F5;
  --color-ivory-warm: #F3EDE6;
  --color-dark: #1A1614;
  --color-dark-soft: #2D2926;
  --color-gold: #B8860B;
  --color-gold-light: #D4A843;
  --color-gold-dark: #8B6914;
  --color-umber: #6B5B47;
  --color-umber-light: #8A7A66;
  --color-border: #E8E2DA;
  --color-border-dark: #C9C0B4;

  --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-sm: 0 1px 3px rgba(26, 22, 20, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 22, 20, 0.08);
  --shadow-lg: 0 8px 30px rgba(26, 22, 20, 0.12);
  --shadow-xl: 0 16px 50px rgba(26, 22, 20, 0.16);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background-color: var(--color-ivory);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-dark);
}

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

/* --- Focus Styles (Accessibility) --- */
:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--color-gold);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 16px;
}

/* --- Header & Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-dark-soft);
  text-decoration: none;
  padding: 8px 0;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gold);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-gold);
}

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

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-dark);
}

.mobile-menu-btn .hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  margin: 5px 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    height: 100dvh;
    background: var(--color-ivory);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 0;
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-base);
    overflow-y: auto;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu .nav-link {
    font-size: 1rem;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    display: block;
  }

  .nav-menu .nav-link::after {
    display: none;
  }

  .mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(26, 22, 20, 0.4);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
  }

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

/* --- Hero Section --- */
.hero-section {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26, 22, 20, 0.72) 0%,
    rgba(26, 22, 20, 0.50) 50%,
    rgba(26, 22, 20, 0.65) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
  max-width: 800px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--color-gold-light);
  font-weight: 400;
  font-style: italic;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-description {
  font-size: clamp(0.95rem, 1.5vw, 1.125rem);
  color: rgba(255, 255, 255, 0.85);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-divider {
  width: 60px;
  height: 2px;
  background: var(--color-gold);
  margin: 0 auto 28px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: var(--color-gold);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-gold-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.btn-outline-dark {
  background: transparent;
  color: var(--color-gold);
  border: 1.5px solid var(--color-gold);
}

.btn-outline-dark:hover {
  background: var(--color-gold);
  color: #fff;
  transform: translateY(-1px);
}

/* --- Section Styles --- */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--color-ivory-warm);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(0.95rem, 1.5vw, 1.125rem);
  color: var(--color-umber);
  font-style: italic;
  margin-bottom: 16px;
}

.section-divider {
  width: 48px;
  height: 2px;
  background: var(--color-gold);
  margin-bottom: 32px;
}

.section-divider-center {
  margin-left: auto;
  margin-right: auto;
}

.section-description {
  font-size: 1rem;
  color: var(--color-umber);
  max-width: 620px;
  line-height: 1.8;
}

/* --- About Section --- */
.about-image-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(184, 134, 11, 0.15);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.about-signature {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-style: italic;
  color: var(--color-gold);
  margin-top: 24px;
}

/* --- Art Category Cards --- */
.art-category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

.art-category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.art-category-card img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.art-category-card:hover img {
  transform: scale(1.04);
}

.art-category-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  background: linear-gradient(to top, rgba(26, 22, 20, 0.8) 0%, transparent 100%);
}

.art-category-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: #fff;
  font-weight: 600;
}

.art-category-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
  margin-top: 4px;
}

/* --- Artwork Grid --- */
.artwork-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.artwork-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

.artwork-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.artwork-card-image {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.artwork-card:hover .artwork-card-image {
  transform: scale(1.03);
}

.artwork-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26, 22, 20, 0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
}

.artwork-card:hover .artwork-card-overlay {
  background: rgba(26, 22, 20, 0.25);
}

.artwork-card-zoom {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition-base), transform var(--transition-base);
  color: var(--color-dark);
}

.artwork-card:hover .artwork-card-zoom {
  opacity: 1;
  transform: scale(1);
}

.artwork-card-info {
  padding: 16px 20px;
}

.artwork-card-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
}

.artwork-card-medium {
  font-size: 0.8125rem;
  color: var(--color-umber-light);
  margin-top: 2px;
}

/* --- Gallery Filter --- */
.gallery-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 20px;
  background: transparent;
  border: 1.5px solid var(--color-border-dark);
  border-radius: 100px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-umber);
  cursor: pointer;
  transition: all var(--transition-base);
}

.filter-btn:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.filter-btn.active {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: #fff;
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(10, 8, 6, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: 24px;
}

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

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

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

.lightbox-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: #fff;
  margin-top: 16px;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: -48px;
  right: 0;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
  font-size: 1.25rem;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
  font-size: 1.25rem;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox-prev {
  left: -64px;
}

.lightbox-next {
  right: -64px;
}

@media (max-width: 768px) {
  .lightbox-prev {
    left: -8px;
  }

  .lightbox-next {
    right: -8px;
  }

  .lightbox-nav {
    width: 40px;
    height: 40px;
  }

  .lightbox-close {
    top: -44px;
    right: -4px;
  }
}

/* --- Contact Form --- */
.contact-form {
  max-width: 520px;
}

.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-umber);
  margin-bottom: 8px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-dark);
  background: #fff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  appearance: none;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.12);
}

.form-input.error,
.form-textarea.error {
  border-color: #C0392B;
}

.form-error {
  font-size: 0.8125rem;
  color: #C0392B;
  margin-top: 6px;
  display: none;
}

.form-error.visible {
  display: block;
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-success {
  padding: 20px 24px;
  background: #f0faf0;
  border: 1px solid #a7d7a7;
  border-radius: var(--radius-md);
  color: #2d6a2d;
  font-weight: 500;
  display: none;
}

.form-success.visible {
  display: block;
}

/* --- Contact Info --- */
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-ivory-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-gold);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 32px;
}

.footer-link {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: var(--color-gold-light);
}

.footer-divider {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin: 32px 0;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-gold);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), visibility var(--transition-base),
              transform var(--transition-base), background var(--transition-base);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-gold-dark);
  transform: translateY(-2px);
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger children */
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 0.5s; }

/* --- Painting Frame Effect --- */
.painting-frame {
  padding: 8px;
  background: linear-gradient(145deg, #d4c5a9, #c9b896, #b8a780);
  border-radius: var(--radius-sm);
  box-shadow: 
    inset 0 1px 2px rgba(255, 255, 255, 0.3),
    inset 0 -1px 2px rgba(0, 0, 0, 0.1),
    var(--shadow-lg);
}

.painting-frame img {
  border-radius: 2px;
}

/* --- Responsive Adjustments --- */
@media (max-width: 640px) {
  .section {
    padding: 64px 0;
  }

  .artwork-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
  }

  .art-category-card img {
    height: 220px;
  }
}

@media (min-width: 1280px) {
  .artwork-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Utility Classes --- */
.text-gold { color: var(--color-gold); }
.text-umber { color: var(--color-umber); }
.bg-ivory { background-color: var(--color-ivory); }
.bg-ivory-warm { background-color: var(--color-ivory-warm); }
.border-gold { border-color: var(--color-gold); }

/* Selection color */
::selection {
  background: rgba(184, 134, 11, 0.2);
  color: var(--color-dark);
}

/* Scrollbar (WebKit) */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-ivory);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-dark);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-umber-light);
}