:root {
  --bg-color: #fafafa;
  --text-color: #1a1a1a;
  --card-bg: #ffffff;
  --accent-color: #7b8898;
  --nav-bg: rgba(250, 250, 250, 0.7);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #f0f0f0;
  --card-bg: #1e1e1e;
  --accent-color: #aeb8c4;
  --nav-bg: rgba(18, 18, 18, 0.7);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: "Poppins", "Noto Serif SC", serif;
  line-height: 1.6;
  transition: var(--transition);
  overflow-x: hidden;
}

/* Navbar: Glassmorphism */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.5rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 2px;
}

.controls {
  display: flex;
  gap: 1rem;
  align-items: center;
}

select {
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--accent-color);
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

#theme-switch {
  background: transparent;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 24px;
  fill: var(--text-color);
}

[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: block;
}

/* Sections */
section,
header {
  padding: 6rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.hero {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(45deg, var(--text-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--accent-color);
}

h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  font-weight: 500;
  letter-spacing: 1px;
}

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

.art-card {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 4/5;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.art-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.art-card:hover img {
  transform: scale(1.05);
}

.art-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  /* 优化渐变背景，让它往上延伸得更平滑，避免突兀的黑边 */
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.85) 0%,
    rgba(0, 0, 0, 0) 100%
  );
  color: white;
  padding: 4rem 1.5rem 1.5rem; /* 增加顶部的 padding，让渐变过渡得更自然 */

  /* 核心动画修改：初始状态完全透明，且稍微往下偏移 20px (而不是整个元素的高度) */
  opacity: 0;

  /* 使用一种被称为 "ease-out-expo" 感觉的丝滑曲线 */
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.art-card:hover .art-overlay {
  /* 悬浮状态：文字不仅浮现，而且伴随极其平滑的减速归位 */
  opacity: 1;
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.project-card:hover {
  transform: translateY(-8px);
}

.project-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.tags {
  margin: 1.5rem 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tags span {
  font-size: 0.8rem;
  padding: 0.3rem 0.8rem;
  background: var(--bg-color);
  border-radius: 20px;
  border: 1px solid var(--accent-color);
}

.btn {
  display: inline-block;
  text-decoration: none;
  color: var(--text-color);
  border-bottom: 1px solid var(--text-color);
  padding-bottom: 2px;
  transition: opacity 0.3s ease;
}

.btn:hover {
  opacity: 0.6;
}

footer {
  text-align: center;
  padding: 3rem;
  color: var(--accent-color);
  font-size: 0.9rem;
}

/* Scroll Animation (灵动感核心) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

/* Mobile Adaptation */
@media (max-width: 768px) {
  .navbar {
    padding: 1rem 5%;
  }
  section,
  header {
    padding: 5rem 5% 3rem;
  }
  .hero {
    min-height: 50vh;
  }
  .art-card {
    aspect-ratio: 1/1;
  }
}

/* =========================================
   定制化艺术下拉框样式 (替代原生 Select)
   ========================================= */
.custom-lang-switch {
  position: relative;
  font-family: inherit;
}

.lang-toggle {
  background: transparent;
  border: none;
  color: var(--text-color);
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem;
  transition: var(--transition);
}

.lang-toggle:hover {
  opacity: 0.6;
}

.chevron {
  width: 14px;
  height: 14px;
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 展开时的箭头翻转 */
.custom-lang-switch.open .chevron {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  /* 核心修改：将位置从下方移上来，利用负值覆盖按钮 */
  top: -8px;
  right: -12px;

  background: var(--nav-bg);
  backdrop-filter: blur(20px); /* 稍微增加一点模糊度，让覆盖效果更柔和 */
  -webkit-backdrop-filter: blur(20px);
  border-radius: 12px;
  list-style: none;
  padding: 0.5rem 0;
  min-width: 120px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1); /* 加深一点阴影，增强悬浮层级感 */
  border: 1px solid rgba(150, 150, 150, 0.15);
  z-index: 1001; /* 确保绝对覆盖在按钮上方 */

  /* 动画调整：去掉垂直位移，改为纯粹的原位“呼吸缩放” */
  opacity: 0;
  visibility: hidden;
  transform: scale(0.85);
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  transform-origin: top right; /* 动画以右上角为基准点展开 */
}

.custom-lang-switch.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.lang-menu li {
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-color);
  transition:
    background 0.3s ease,
    color 0.3s ease;
}

.lang-menu li:hover {
  background: rgba(150, 150, 150, 0.1);
  color: var(--accent-color);
}

.lang-menu li.active {
  font-weight: 600;
}

/* 为所有需要翻译的元素添加渐变过渡，让文字切换不生硬 */
[data-i18n] {
  transition: opacity 0.3s ease;
}

/* 艺术引言专属样式 */
.section-subtitle {
  font-family: "Noto Serif SC", serif; /* 使用衬线体，自带文艺与雕刻感 */
  font-size: 1.05rem;
  color: var(--accent-color); /* 使用主题变量中的柔和色彩 */
  margin-top: -1.5rem;
  margin-bottom: 3rem; /* 为下方的画廊留出呼吸空间 */
  font-weight: 300;
  opacity: 0.85;
}