: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);
  --overlay-bg: rgba(255, 255, 255, 0.9);
  --overlay-text: #1a1a1a;
  /* 极简几何形状柔和颜色 (亮色模式) */
  --shape-color: rgba(123, 136, 152, 0.08);
}

[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);
  --overlay-bg: rgba(0, 0, 0, 0.85);
  --overlay-text: #f0f0f0;
  /* 极简几何形状柔和颜色 (暗色模式) */
  --shape-color: rgba(240, 240, 240, 0.04);
}

* {
  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; /* 防止形状超出 body */
}

/* 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);
}

.sun-icon {
  color: white;
}

[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;
  background: linear-gradient(to top, var(--overlay-bg) 0%, transparent 100%);
  color: var(--overlay-text);
  padding: 4rem 1.5rem 1.5rem;

  opacity: 0;
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.art-card:hover .art-overlay {
  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;
}

/* =========================================
   背景几何形状设计
   ========================================= */
.background-shapes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1; /* 放在所有内容后面 */
  pointer-events: none; /* 不干扰用户交互 */
  overflow: hidden; /* 防止形状超出 body */
}

.shape {
  position: absolute;
  background-color: var(--shape-color);
  transition: transform 0.2s ease-out; /* 让鼠标跟随更平滑 */
}

/* 形状 1: 大圆 */
.shape-1 {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  top: 10%;
  left: -50px;
}

/* 形状 2: 旋转的正方形 */
.shape-2 {
  width: 200px;
  height: 200px;
  top: 60%;
  right: -50px;
  transform: rotate(45deg);
}

/* 形状 3: 三角形 */
.shape-3 {
  width: 150px;
  height: 150px;
  bottom: 10%;
  left: 20%;
  /* 使用 clip-path 创建三角形 */
  clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

/* 形状 4: 另一个圆，更小，位置不同 */
.shape-4 {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  top: -20px;
  right: 20%;
}

/* 移动端适配 */
@media (max-width: 768px) {
  .shape-1 {
    width: 150px;
    height: 150px;
    top: 5%;
  }
  .shape-2 {
    width: 100px;
    height: 100px;
    top: 70%;
  }
  .shape-3 {
    width: 80px;
    height: 80px;
    left: 10%;
  }
  .shape-4 {
    width: 50px;
    height: 50px;
  }
}

/* =========================================
   自定义鼠标指针 (仅在支持鼠标的设备上生效)
   ========================================= */
@media (pointer: fine) {
  /* 隐藏默认鼠标以及各个可点击元素的默认小手 */
  body,
  a,
  button,
  select,
  .art-card,
  .lang-menu li {
    cursor: none !important;
  }

  /* 隐藏所有文本的默认鼠标 (I形光标) */
  p,
  h1,
  h2,
  h3,
  span,
  .logo {
    cursor: none !important;
  }

  /* 当鼠标悬浮在文本上时：圆环压扁拉长，变成一条优雅的垂直线 */
  .custom-cursor-ring.text-hover {
    width: 4px;
    height: 30px;
    border-radius: 4px;
    background-color: var(--accent-color);
    border-color: transparent;
    opacity: 0.4;
    /* 让它在小黑点背后形成一个柔和的竖向光晕 */
  }

  /* 中心小实心点 (笔尖) */
  .custom-cursor-dot {
    position: fixed;
    top: 0;
    left: 0;
    width: 6px;
    height: 6px;
    background-color: var(--text-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none; /* 穿透鼠标事件，防止遮挡点击 */
    z-index: 9999; /* 保证在最顶层 */
    transition: opacity 0.3s ease;
  }

  /* 外围空心圆环 (灵动跟随) */
  .custom-cursor-ring {
    position: fixed;
    top: 0;
    left: 0;
    width: 32px;
    height: 32px;
    border: 1px solid var(--accent-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 9998;
    /* 注意：不要给 transform 加 transition，否则 JS 动画会卡顿 */
    transition:
      width 0.3s ease,
      height 0.3s ease,
      background-color 0.3s ease,
      border-color 0.3s ease,
      opacity 0.3s ease;
  }

  /* 悬停在可点击元素上的状态：圆环放大，变成淡淡的阴影 */
  .custom-cursor-ring.hover {
    width: 50px;
    height: 50px;
    background-color: var(--shape-color); /* 利用之前定义的几何背景极淡色 */
    border-color: transparent; /* 隐藏边框，只留阴影 */
  }
}

/* =========================================
   全局文本选中高亮颜色 (艺术化选词)
   ========================================= */
::selection {
  background-color: var(--accent-color); /* 使用你的高级灰/柔和强调色 */
  color: var(--bg-color); /* 文字变成背景色，形成反差 */
  /* 文字选中时取消阴影，保持纯粹的几何感 */
  text-shadow: none;
}