@import url('https://fonts.googleapis.com/css2?family=Iansui&display=swap');

:root {
  --page-font: 'PT Sans', 'Heiti TC', 'Heiti SC', '源石黑體', 'jf open 粉圓 2.0', tauhu-oo, Iansui, sans-serif;
  --page-bg: #fdfdfd;
  --page-text: #2c3e35;
  --page-heading: #1e4a38;
  --page-accent: #245d48;
  --page-accent-light: #eaf3ed;
  --page-border: #e2e8f0;
  --page-card-bg: #ffffff;
  --page-link: #1e6b52;
  --page-link-hover: #124534;
  --page-code-bg: #f1f5f3;
  --page-blockquote-bg: #f4f8f5;
  --nav-bg: rgba(253, 253, 253, 0.92);
  --nav-border: #e2ece6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #1a1e1c;
    --page-text: #d8e2dc;
    --page-heading: #a3c9b8;
    --page-accent: #5ba382;
    --page-accent-light: #22332a;
    --page-border: #2d3b34;
    --page-card-bg: #212825;
    --page-link: #7ec4a5;
    --page-link-hover: #a3e0c7;
    --page-code-bg: #252e2a;
    --page-blockquote-bg: #222c27;
    --nav-bg: rgba(26, 30, 28, 0.92);
    --nav-border: #2d3b34;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--page-font);
  background-color: var(--page-bg);
  color: var(--page-text);
  line-height: 1.8;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

/* Top Navigation Bar */
.page-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--nav-border);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--page-accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: background-color 0.2s, color 0.2s;
}

.page-nav-link:hover {
  background-color: var(--page-accent-light);
  color: var(--page-link-hover);
}

.page-nav-brand {
  font-size: 0.9rem;
  color: var(--page-text);
  opacity: 0.75;
  font-weight: 500;
}

/* Main Container */
.page-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Content Typography */
.page-content h1 {
  font-size: 2rem;
  color: var(--page-heading);
  margin-top: 0;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--page-accent-light);
  line-height: 1.3;
}

.page-content h2 {
  font-size: 1.5rem;
  color: var(--page-heading);
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--page-border);
}

.page-content h3 {
  font-size: 1.25rem;
  color: var(--page-heading);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.page-content p {
  margin: 1.1rem 0;
}

.page-content a {
  color: var(--page-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

.page-content a:hover {
  color: var(--page-link-hover);
}

.page-content ul, .page-content ol {
  padding-left: 1.75rem;
  margin: 1.1rem 0;
}

.page-content li {
  margin-bottom: 0.5rem;
}

.page-content blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  background-color: var(--page-blockquote-bg);
  border-left: 4px solid var(--page-accent);
  border-radius: 0 6px 6px 0;
}

.page-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  padding: 0.2em 0.4em;
  border-radius: 4px;
  background-color: var(--page-code-bg);
}

.page-content pre {
  padding: 1rem;
  border-radius: 8px;
  background-color: var(--page-code-bg);
  overflow-x: auto;
}

.page-content pre code {
  padding: 0;
  background-color: transparent;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.page-content th, .page-content td {
  border: 1px solid var(--page-border);
  padding: 0.6rem 0.85rem;
  text-align: left;
}

.page-content th {
  background-color: var(--page-accent-light);
  color: var(--page-heading);
}

.page-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

/* Day Count highlight */
[data-day-count] {
  font-weight: 700;
  color: var(--page-accent);
}

/* Error / Not Found view */
.page-not-found {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background-color: var(--page-card-bg);
  border: 1px dashed var(--page-border);
  border-radius: 12px;
  margin-top: 2rem;
}

.page-not-found h2 {
  font-size: 1.6rem;
  color: var(--page-heading);
  margin-bottom: 0.75rem;
  border: none;
}

.page-not-found p {
  color: var(--page-text);
  margin-bottom: 1.5rem;
  opacity: 0.85;
}

.page-home-btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  background-color: var(--page-accent);
  color: #ffffff !important;
  text-decoration: none !important;
  font-weight: 600;
  border-radius: 6px;
  transition: opacity 0.2s;
}

.page-home-btn:hover {
  opacity: 0.9;
}

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }
  .page-container {
    padding: 1.5rem 1rem 3rem;
  }
  .page-content h1 {
    font-size: 1.6rem;
  }
}