body {
  font-family: 'Microsoft JhengHei', 微軟正黑體, "Segoe UI", "Noto Sans TC", Arial, sans-serif;
  background: url("https://i.postimg.cc/52WpBVS3/topbg.png")
    no-repeat center center fixed;
  background-size: cover;
  color: var(--text);
  margin: 0;
  padding: 0;
  transition: background var(--transition-normal),
    color var(--transition-normal);
  position: relative;
  z-index: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  background: rgba(82, 77, 65, 0); /* 可調整：深色遮罩透明度 */
  backdrop-filter: blur(0px); /* 可調整：模糊強度 */
  pointer-events: none;
}
:root {
  /* 主題顏色 */
  --bg: #181a1b;
  --text: #f1f1f1;
  --card: #23272a;
  --accent: #ffb700;
  --accent-gradient: linear-gradient(90deg, var(--accent) 0%, #ff8c00 100%);
  --border: #333;
  --shadow: rgba(0, 0, 0, 0.08);

  /* 間距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;

  /* 斷點 */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;

  /* 動畫時間 */
  --transition-fast: 0.2s;
  --transition-normal: 0.3s;
  --transition-slow: 0.5s;
}

body.light {
  --bg: #f7f7f7;
  --text: #222;
  --card: #fff;
  --accent: #b8860b;
  --border: #ddd;
  --shadow: rgba(0, 0, 0, 0.06);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

header {
  background: var(--card);
  padding: 1.5rem 0 1rem 0;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  position: relative;
  top: 0;
  z-index: 10;
  display: block;
}
header h1 {
  margin: 0 auto;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 2;
  width: fit-content;
}
#timer-section {
  position: absolute;
  right: 2rem;
  top: 1.5rem;
  min-width: 220px;
  text-align: right;
  background: none;
  box-shadow: none;
  z-index: 3;
  margin: 0;
  padding: 0;
}
#timer-section h2 {
  display: none;
}
#countdown {
  font-size: 1.3rem;
  color: #ffb700;
  margin-top: 0;
  font-family: "Orbitron", "Segoe UI", "Noto Sans TC", Arial, sans-serif;
  letter-spacing: 0.08em;
  text-shadow: 0 0 12px #ffb70088, 0 0 32px #fff2;
  background: linear-gradient(90deg, #ffb700 0%, #ff8c00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
#toc {
  background: var(--card);
  margin: 1rem auto;
  max-width: 900px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  padding: 1rem 2rem;
  border: 2px solid #ffb700; /* 新增橘色邊框 */
}
#toc h2 {
  margin-top: 0;
}
#toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
#toc-list li {
  width: 100%;
}
#toc-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.2s;
}
#toc-list a:hover {
  color: #ffb700;
}
main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.info-block {
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  margin-bottom: 2rem;
  padding: 1.5rem 2rem;
  border-left: 6px solid var(--accent);
  transition: box-shadow 0.2s, border 0.2s;
  position: relative;
  overflow: hidden;
}
.info-block.collapsed .block-content {
  max-height: 0;
  opacity: 0;
  padding: 0;
  transition: max-height 0.3s, opacity 0.3s, padding 0.3s;
}
.info-block .block-title {
  margin-top: 0;
  cursor: pointer;
  user-select: none;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.info-block .block-title::after {
  content: "▼";
  font-size: 0.9em;
  margin-left: auto;
  transition: transform 0.3s;
}
.info-block.collapsed .block-title::after {
  transform: rotate(-90deg);
}
.info-links {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0 0;
}
.info-links li {
  margin-bottom: 0.5rem;
  word-break: break-all;
}
.info-links a,
.block-content a {
  color: var(--accent) !important;
  text-decoration: underline;
}
.info-links a:visited,
.block-content a:visited {
  color: var(--accent) !important;
}
.block-content {
  margin-top: 1rem;
  font-size: 1.1rem;
  line-height: 1.7;
  transition: max-height 0.3s, opacity 0.3s, padding 0.3s;
  opacity: 1;
  overflow: visible; /* 讓內容不被裁切 */
}
#back-to-top {
  position: fixed;
  right: 2rem;
  bottom: 2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 2rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  display: none;
  z-index: 100;
  transition: background 0.2s;
}
#back-to-top:hover {
  background: #ffb700;
}
footer {
  text-align: center;
  color: #888;
  padding: 2rem 0 1rem 0;
  font-size: 1rem;
}
body,
html {
  cursor: url("M.png") 0 0, url("./M.png") 0 0, pointer;
}
@media (max-width: 600px) {
  main,
  #toc {
    padding: 0 0.5rem;
  }
  .info-block {
    padding: 1rem 0.7rem;
  }
}
#twitch-embed {
  width: 100%;
  max-width: 620px;
  aspect-ratio: 16/9;
  min-width: 300px;
  min-height: 180px;
  box-sizing: border-box;
  border: 2px solid var(--accent);
  border-radius: 12px;
  background: #181a1b;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  margin: 1rem auto;
  resize: horizontal; /* 只允許水平調整，避免內容被擠壓 */
  overflow: auto;
  display: block;
}
#twitch-embed iframe {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 10px;
  display: block;
}
.bili-embed {
  width: 100%;
  max-width: 620px;
  aspect-ratio: 16/9;
  min-width: 300px;
  min-height: 180px;
  box-sizing: border-box;
  border: 2px solid var(--accent);
  border-radius: 12px;
  background: #181a1b;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  margin: 1rem auto;
  display: block;
}
.youtube-container {
  display: flex;
  justify-content: center;
  width: 100%;
  max-width: 620px;
  margin: 1rem auto;
}
.youtube-embed,
iframe[src*="youtube.com/embed"] {
  width: 560px !important;
  height: 315px !important;
  box-sizing: border-box;
  border: 2px solid var(--accent);
  border-radius: 12px;
  background: #181a1b;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  display: block;
  margin: 0 auto;
}

@media (max-width: 600px) {
  .youtube-embed,
  iframe[src*="youtube.com/embed"] {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 16/9;
  }
}
.auto-image-container {
  display: inline-block;
  border: 2px solid var(--accent);
  border-radius: 12px;
  background: #181a1b;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  margin: 1rem auto;
  padding: 0.5rem;
  overflow-x: auto;
  text-align: center;
  max-width: 100%;
}

.auto-image {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: none;
}

@media (max-width: 600px) {
  .auto-image-container {
    margin: 1rem -0.5rem;
    width: calc(100% + 1rem);
    border-left: none;
    border-right: none;
    border-radius: 0;
  }
  .auto-image {
    border-radius: 4px;
  }
}