/* ============================================================
   Art Website - Apple 风格主样式表
   设计参考：apple.com, aaronblake.com, jamestark.com
   ============================================================ */

/* ---- 1. 基础重置 ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #86868b;
  --color-border: #d2d2d7;
  --color-accent: #0066cc;
  --color-accent-hover: #0055b3;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", Georgia, serif;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;

  --container-max: 1200px;
  --nav-height: 48px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.12);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }

/* ---- 2. 顶部导航（Flex 第一项，固定顶部） ---- */
.nav {
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

/* ---- 主内容区（Flex 中间，flex:1 填满剩余空间，独立滚动） ---- */
#app {
  flex: 1 1 0;
  overflow-y: auto;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}

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

.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 16px; }

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--color-text);
  color: white;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}

.nav-links { display: flex; gap: 28px; }

.nav-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color .2s var(--ease);
}

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

/* ---- 3. 通用布局 ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section { padding: var(--space-2xl) 0; }

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

.section-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ---- 4. Hero 首屏 ---- */
.hero {
  position: relative;
  padding: var(--space-xl) 0 var(--space-2xl);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -260px;
  left: 50%;
  transform: translateX(-50%);
  width: min(900px, 110vw);
  height: 640px;
  background: radial-gradient(circle at center, rgba(0, 102, 204, 0.07) 0%, rgba(0, 102, 204, 0) 65%);
  pointer-events: none;
  z-index: 0;
}

.hero > * { position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(40px, 8vw, 84px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 24px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 26px);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto var(--space-lg);
  line-height: 1.4;
}

.hero-cta {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-md);
}

/* ---- 5. 精选作品 / 画廊网格 ---- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.gallery-card {
  display: block;
  text-decoration: none;
  color: inherit;
}

.gallery-card-image {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-bg-alt);
  aspect-ratio: 4 / 5;
}

.gallery-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .9s var(--ease-out);
}

.gallery-card:hover .gallery-card-image img { transform: scale(1.045); }

.gallery-card-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #ececf1 0%, #d2d2d7 100%);
}

.gallery-card-info { padding-top: 14px; }

.gallery-card-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--color-text);
  transition: color .25s var(--ease);
}

.gallery-card:hover .gallery-card-title { color: var(--color-accent); }

.gallery-card-meta {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

/* ---- 6. 分类筛选 ---- */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.filter-btn {
  padding: 8px 18px;
  border-radius: 980px;
  font-size: 14px;
  color: var(--color-text-secondary);
  background: transparent;
  transition: all .2s var(--ease);
}

.filter-btn:hover { background: var(--color-bg-alt); color: var(--color-text); }

.filter-btn.active { background: var(--color-text); color: white; }

/* ---- 7. 作品详情页 ---- */
.artwork-detail { padding: var(--space-lg) 0 var(--space-2xl); }

.artwork-detail-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.artwork-detail-main-image {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.artwork-detail-main-image img { width: 100%; height: auto; cursor: zoom-in; }

.artwork-detail-side { padding-top: var(--space-md); }

.artwork-detail-back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.artwork-detail-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.artwork-detail-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 20px;
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
  font-size: 14px;
}

.meta-label { color: var(--color-text-secondary); }
.meta-value { color: var(--color-text); }

.artwork-detail-description {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  white-space: pre-wrap;
}

/* ---- 8. 关于页面 ---- */
.about-intro {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-2xl) 0;
  text-align: center;
}

.about-intro-portrait {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-md);
  background: var(--color-bg-alt);
}

.about-intro-name {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 8px;
}

.about-intro-bio-short {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.about-bio {
  max-width: 720px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}

.socials {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  padding: var(--space-lg) 0 var(--space-2xl);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--color-bg-alt);
  border-radius: 980px;
  font-size: 14px;
  color: var(--color-text);
  transition: all .2s var(--ease);
}

.social-link:hover {
  background: var(--color-text);
  color: white;
  transform: translateY(-2px);
}

/* ---- 9. 联系页面 ---- */
.contact-wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-2xl) 0;
  text-align: center;
}

.contact-info {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.contact-item {
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  text-align: left;
}

.contact-item-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.contact-item-value { font-size: 18px; color: var(--color-text); }

/* ---- 10. 加载与空状态 ---- */
.loading-screen {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-bg-alt);
  border-top-color: var(--color-text);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  padding: var(--space-2xl) 0;
  text-align: center;
  color: var(--color-text-secondary);
}

.empty-state-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

/* ---- 11. 灯箱 ---- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn .2s var(--ease);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.lightbox[hidden] { display: none; }

.lightbox-img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  font-size: 32px;
  color: white;
  opacity: 0.7;
  transition: opacity .2s;
}


/* ---- 12. 底部（Flex 第三项，固定底部） ---- */
.footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding: var(--space-lg) 0;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 18px;
  text-align: center;
}

.footer-brand {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

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

.footer-links {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-secondary);
  transition: color .2s var(--ease);
}

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

.footer-copy {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.footer-sep {
  font-size: 13px;
  color: var(--color-border);
  user-select: none;
}

/* ---- 13. 滚动动画 ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}

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

/* ---- 14. 响应式 ---- */
@media (max-width: 768px) {
  :root { --space-xl: 40px; --space-2xl: 64px; }

  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; }

  .artwork-detail-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-inner { gap: 10px 14px; }

  .footer-links { gap: 16px; }
  .footer-sep { display: none; }

  .gallery {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-md);
  }

  .gallery-card-image { aspect-ratio: 1 / 1; }
}

@media (max-width: 480px) {
  .nav-inner { padding: 0 16px; }
  .nav-logo .logo-text { display: none; }
  .nav-links { gap: 12px; }
}

/* ---- 15. 减少动画（无障碍）---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  color: white;
  font-size: 44px;
  opacity: 0.7;
  transition: opacity .2s;
}

.lightbox-nav:hover { opacity: 1; }
.lightbox-nav.lightbox-prev { left: 20px; }
.lightbox-nav.lightbox-next { right: 20px; }

.lightbox-caption {
  position: absolute;
  bottom: 24px;
  left: 0;
  right: 0;
  text-align: center;
  color: rgba(255,255,255,.8);
  font-size: 14px;
}

.artwork-detail-thumbnails {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 8px;
  margin-top: var(--space-md);
}

.artwork-detail-thumbnails img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity .2s;
}

.artwork-detail-thumbnails img:hover,
.artwork-detail-thumbnails img.active {
  opacity: 1;
  outline: 2px solid var(--color-accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 500;
  transition: all .2s var(--ease);
}

.btn-primary { background: var(--color-accent); color: white; }

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
  color: var(--color-accent);
  background: transparent;
  padding: 12px 24px;
  border-radius: 980px;
}

.btn-secondary:hover { background: rgba(0, 102, 204, 0.08); }