/* =============================================
   Zhang's Art — Stylesheet
   ============================================= */

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

:root {
  --color-bg: #fefefe;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-accent: #c0392b;
  --color-accent-light: #e8d5d3;
  --color-border: #e8e4e0;
  --header-height: 68px;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Poppins', system-ui, sans-serif;
  --max-width: 1280px;
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-weight: 300;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  cursor: url('../images/brush-cursor.svg') 4 28, crosshair;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; width: 100%; height: 100%; object-fit: cover; }

/* --- Custom Cursor --- */
.cursor { display: none; }

.cursor-follower {
  position: fixed;
  top: 0; left: 0;
  width: 32px;
  height: 32px;
  background: url('../images/brush-cursor.svg') no-repeat center;
  background-size: contain;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-4px, -28px);
  opacity: 0;
}

.cursor-follower.stroke {
  animation: brushStroke 0.35s ease-out forwards;
}

@keyframes brushStroke {
  0%   { transform: translate(-4px, -28px) rotate(0deg)   scale(1);    }
  30%  { transform: translate(-9px, -23px) rotate(-14deg) scale(1.12); }
  65%  { transform: translate(1px,  -33px) rotate(7deg)   scale(1.08); }
  100% { transform: translate(-4px, -28px) rotate(0deg)   scale(1);    }
}

a, button, [role="button"], input[type="submit"], input[type="button"], .painting-card, .filter-btn, .filter-size-opt { cursor: none; }

/* --- Layout Helpers --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section { padding: 5rem 0; }

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

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

.logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  letter-spacing: 0.01em;
  color: var(--color-text);
  white-space: nowrap;
}

.main-nav ul {
  display: flex;
  gap: 2.5rem;
}

.main-nav a {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--transition);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
}

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

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: inherit;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: var(--transition);
}

/* --- Mobile Nav --- */
.mobile-nav {
  position: fixed;
  top: 0; right: -100%;
  width: min(320px, 85vw);
  height: 100%;
  background: var(--color-bg);
  z-index: 200;
  padding: 5rem 2rem 2rem;
  transition: right 0.35s ease;
  border-left: 1px solid var(--color-border);
}

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

.mobile-nav ul { display: flex; flex-direction: column; gap: 1.5rem; }

.mobile-nav a {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-text);
}

.mobile-nav-close {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: inherit;
  color: var(--color-text-muted);
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 199;
}

.mobile-nav-overlay.open { display: block; }

/* --- Hero --- */
.hero {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 0;
}

.hero-spacer {
  height: calc(100vh - var(--header-height));
  position: relative;
  z-index: 2;
  pointer-events: none;
}

.featured-section {
  position: relative;
  z-index: 2;
  background: rgba(254, 254, 254, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.about-strip,
.contact-section,
.site-footer {
  position: relative;
  z-index: 2;
}

.hero-image-wrap {
  position: absolute;
  inset: 0;
}

.hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroZoom 14s ease-in-out infinite alternate;
  transform-origin: center center;
}

@keyframes heroZoom {
  from { transform: scale(1.18); }
  to   { transform: scale(1.0); }
}

.hero-placeholder {
  width: 100%;
  height: 100%;
  /* Warm gradient as placeholder — replace with your painting image */
  background: linear-gradient(135deg, #e8d5c4 0%, #c9a87c 40%, #b5927e 70%, #a07060 100%);
}

.hero-text {
  position: absolute;
  right: 6%;
  bottom: 12%;
  z-index: 2;
  text-align: right;
  color: #fff;
  padding: 2.5rem 3rem;
  text-shadow: 0 2px 16px rgba(0,0,0,0.55);
  background: linear-gradient(135deg, transparent, rgba(0,0,0,0.3));
  border-right: 2px solid rgba(255,255,255,0.4);
}

.hero-text h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.hero-text h1 em {
  font-style: italic;
  color: #f5e6d8;
  display: block;
}

.scroll-arrow {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  width: 52px;
  height: 52px;
  z-index: 2;
}

.scroll-arrow svg {
  width: 100%;
  height: 100%;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1.5px solid var(--color-accent);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn:hover {
  background: transparent;
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
}

/* --- Section Titles --- */
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 400;
  margin-bottom: 3rem;
  text-align: center;
}

.section-cta {
  text-align: center;
  margin-top: 3rem;
}

/* --- Paintings Grid --- */
.paintings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2rem;
}

.paintings-grid--large {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2.5rem;
}

.painting-card {
  display: block;
  transition: transform var(--transition);
}

.painting-card:hover {
  transform: translateY(-4px);
}

.painting-img-wrap {
  position: relative;
  overflow: hidden;
  background: #faf7f4;
  aspect-ratio: 4 / 5;
  padding: 1.5rem;
}

.painting-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transition: transform 0.5s ease;
}

.painting-placeholder {
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
}

.painting-card:hover .painting-placeholder,
.painting-card:hover .painting-img-wrap img {
  transform: scale(1.04);
}

.painting-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.painting-card:hover .painting-overlay { opacity: 1; }

.painting-overlay span {
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid rgba(255,255,255,0.7);
  padding: 0.4rem 1rem;
}

.painting-info {
  padding: 0.9rem 0 0.2rem;
}

.painting-info h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 400;
  margin-bottom: 0.2rem;
}

.painting-info p {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

/* --- About Strip (homepage) --- */
.about-strip {
  background: #f5ede8;
  padding: 5rem 0;
}

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

.about-strip-text h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 400;
  margin-bottom: 1rem;
}

.about-strip-text p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  max-width: 480px;
}

.about-img-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: linear-gradient(145deg, #c9b4a8, #a08070);
  border-radius: 2px;
}

/* --- Page Hero (inner pages) --- */
.page-hero {
  padding: calc(var(--header-height) + 3rem) 2rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.page-hero p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* --- Filter Bar --- */
.filter-bar {
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: none;
  border: 1.5px solid var(--color-border);
  padding: 0.45rem 1.2rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: inherit;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.painting-card.hidden {
  display: none;
}

.filter-dropdown {
  position: relative;
}

.filter-arrow {
  font-size: 0.7rem;
  margin-left: 0.3rem;
}

.filter-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  background: #fff;
  border: 1.5px solid var(--color-border);
  padding: 0.5rem;
  z-index: 50;
  min-width: 130px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.filter-dropdown-menu.open {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.filter-size-opt {
  background: none;
  border: none;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-align: left;
  color: var(--color-text);
  transition: background var(--transition);
}

.filter-size-opt:hover,
.filter-size-opt.active {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 300;
  align-items: center;
  justify-content: center;
}

.lightbox.open { display: flex; }

.lightbox-close {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: inherit;
  opacity: 0.7;
  transition: opacity var(--transition);
}

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

.lightbox-content {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}

/* --- About Page --- */
.about-page-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 5rem;
  align-items: start;
}

.about-img-placeholder--large {
  width: 100%;
  aspect-ratio: 3 / 4;
}

.about-page-image img,
.about-strip-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: initial;
}

.about-page-text h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 400;
  margin-bottom: 1.2rem;
}

.about-page-text h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  margin: 2rem 0 0.6rem;
}

.about-page-text p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  max-width: 520px;
}

.exhibition-list {
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.exhibition-list li {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.7rem;
}

.exhibition-list .year {
  font-weight: 500;
  color: var(--color-accent);
  min-width: 40px;
}

.about-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

/* --- Contact Section --- */
.contact-section {
  background: #f5ede8;
  text-align: center;
}

.contact-inner p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.newsletter-form {
  display: flex;
  max-width: 440px;
  margin: 0 auto;
  gap: 0;
}

.newsletter-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-right: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  background: var(--color-bg);
  outline: none;
  transition: border-color var(--transition);
}

.newsletter-form input:focus {
  border-color: var(--color-accent);
}

.newsletter-form .btn {
  border-left: none;
  white-space: nowrap;
}

.form-message {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--color-accent);
  min-height: 1.2em;
}

/* --- Contact Page --- */
.contact-page-inner {
  max-width: 620px;
  margin: 0 auto;
}

.contact-page-intro {
  text-align: center;
  margin-bottom: 3rem;
}

.contact-page-intro h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  margin-bottom: 1rem;
}

.contact-page-intro p {
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.contact-email a {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.contact-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.contact-form-group label {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.contact-form-group input,
.contact-form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid #e0d9d2;
  background: #faf7f4;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
  resize: none;
}

.contact-form-group input:focus,
.contact-form-group textarea:focus {
  border-color: var(--color-text-muted);
}

.contact-form .btn {
  align-self: flex-start;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: #fff;
}

.site-footer p {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

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

.footer-links a {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}

.footer-links a:hover { color: #fff; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .about-strip-inner,
  .about-page-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-strip-image { order: -1; }
  .about-img-placeholder { aspect-ratio: 16 / 9; }
  .about-img-placeholder--large { aspect-ratio: 16 / 9; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }

  .menu-toggle { display: flex; }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form input {
    border-right: 1.5px solid var(--color-border);
    border-bottom: none;
  }

  .newsletter-form .btn { border-left: 1.5px solid var(--color-accent); }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero-text { right: 4%; bottom: 8%; padding: 1.5rem 2rem; }
  .hero-text h1 { font-size: 2.2rem; }
}

@media (max-width: 480px) {
  .paintings-grid,
  .paintings-grid--large {
    grid-template-columns: 1fr;
  }

  .container { padding: 0 1.2rem; }
}

/* --- Painting Detail Page --- */
.painting-detail-page {
  padding-bottom: 6rem;
}

.pd-back {
  padding-top: 2.5rem;
  padding-bottom: 1rem;
}

.pd-back-link {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.pd-back-link:hover { color: var(--color-accent); }

.pd-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  padding-top: 2rem;
}

.pd-main-img-wrap {
  width: 100%;
  overflow: hidden;
  position: relative;
}

.pd-zoomable {
}

.pd-zoom-hint {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.75rem;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.pd-zoomable:hover .pd-zoom-hint {
  opacity: 1;
}

.pd-main-img-wrap img {
  width: 100%;
  height: auto;
  object-fit: initial;
  display: block;
}

.pd-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.pd-detail-thumb {
  background: #f0e9e1;
  border: 2px solid transparent;
  padding: 0;
  cursor: inherit;
  overflow: hidden;
  transition: border-color var(--transition);
  aspect-ratio: 1;
}

.pd-detail-thumb:hover {
  border-color: var(--color-accent);
}

.pd-detail-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transition: transform 0.4s ease;
}

.pd-detail-thumb:hover img { transform: scale(1.06); }

.pd-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.pd-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.pd-meta-row {
  display: flex;
  gap: 1.5rem;
  font-size: 0.88rem;
}

.pd-meta-row dt {
  color: var(--color-text-muted);
  min-width: 60px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  padding-top: 0.1rem;
}

.pd-meta-row dd {
  color: var(--color-text);
}

.pd-description {
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .pd-main {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* --- Fade-in animation --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeUp 0.6s ease forwards;
}