/* 圣诞节主题CSS - 覆盖默认样式 */
/* 主题颜色变量 */
:root {
  --christmas-bg: #3e6e54;
  --christmas-text: #f2e9d8;
  --christmas-red: #d32f2f;
  --christmas-gold: #ffd700;
  --christmas-silver: #c0c0c0;
  --christmas-dark-green: #2e593f;
  --christmas-light-green: #5a8c6d;
}

/* 基础样式覆盖 */
html {
  background: linear-gradient(
    135deg,
    var(--christmas-bg) 0%,
    var(--christmas-dark-green) 100%
  );
  color: var(--christmas-text);
  font-family: "Microsoft YaHei", sans-serif;
}

body {
  background: transparent;
}

/* 链接样式覆盖 */
a {
  color: var(--christmas-gold);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

a:hover {
  color: var(--christmas-text);
  text-decoration: underline;
}

/* 按钮样式覆盖 */
button {
  background: linear-gradient(
    45deg,
    var(--christmas-red),
    var(--christmas-gold)
  );
  color: var(--christmas-text);
  border: 2px solid var(--christmas-gold);
  font-weight: bold;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

button:hover {
  background: linear-gradient(
    45deg,
    var(--christmas-gold),
    var(--christmas-red)
  );
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

button:active {
  transform: translateY(0);
}

/* 表单元素样式覆盖 */
input,
textarea,
select {
  background: rgba(242, 233, 216, 0.1);
  border: 2px solid var(--christmas-light-green);
  color: var(--christmas-text);
  backdrop-filter: blur(10px);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--christmas-gold);
  box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.3);
  background: rgba(242, 233, 216, 0.2);
}

/* 表格样式覆盖 */
th {
  background: linear-gradient(
    45deg,
    var(--christmas-dark-green),
    var(--christmas-bg)
  );
  color: var(--christmas-gold);
  border-bottom: 3px solid var(--christmas-gold);
}

td {
  background: rgba(242, 233, 216, 0.05);
  border-bottom: 1px solid var(--christmas-light-green);
}

/* 标题样式覆盖 */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--christmas-gold);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  background: linear-gradient(
    45deg,
    transparent,
    rgba(255, 215, 0, 0.1),
    transparent
  );
  padding: 10px 20px;
  border-radius: 10px;
  display: inline-block;
}

/* 圣诞主题专用类 */
.christmas-card {
  background: linear-gradient(
    135deg,
    rgba(62, 110, 84, 0.9),
    rgba(46, 89, 63, 0.9)
  );
  border: 3px solid var(--christmas-gold);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
}

.christmas-button {
  background: linear-gradient(
    45deg,
    var(--christmas-red),
    var(--christmas-gold)
  );
  color: var(--christmas-text);
  border: 2px solid var(--christmas-gold);
  padding: 15px 30px;
  border-radius: 25px;
  font-size: 1.2em;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 2px;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.christmas-button:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

/* 雪花效果 */
.snowflakes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
}

.snowflake {
  position: absolute;
  background: white;
  border-radius: 50%;
  opacity: 0.8;
  animation: fall linear infinite;
}

@keyframes fall {
  to {
    transform: translateY(100vh);
  }
}

/* 彩灯效果 */
.christmas-lights {
  position: relative;
  padding: 20px 0;
}

.light-string {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.light-bulb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: blink 2s infinite;
  box-shadow: 0 0 10px currentColor;
}

.light-bulb:nth-child(odd) {
  background: var(--christmas-red);
  animation-delay: 0s;
}

.light-bulb:nth-child(even) {
  background: var(--christmas-gold);
  animation-delay: 1s;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.3;
  }
}

/* 圣诞树装饰 */
.christmas-tree {
  position: relative;
  width: 200px;
  height: 300px;
  margin: 0 auto;
}

.tree-layer {
  position: absolute;
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-bottom: 100px solid var(--christmas-dark-green);
}

.tree-layer:nth-child(1) {
  bottom: 0;
}
.tree-layer:nth-child(2) {
  bottom: 60px;
  transform: scale(0.8);
}
.tree-layer:nth-child(3) {
  bottom: 120px;
  transform: scale(0.6);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .christmas-card {
    padding: 20px;
    margin: 10px;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    padding: 8px 16px;
    font-size: 90%;
  }
}

/* 打印样式 */
@media print {
  .snowflakes,
  .christmas-lights {
    display: none;
  }

  .christmas-card {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}