/* ========
  主题变量
   ======= */
:root {
  /* 文字 & 链接 */
  --text-color: #28312a;
  --link-color: #1e7e5c;
  --secondary-color: #2c5541;

  --color-border: #e5e5e5;
  --color-footer: #aaa;
  --color-quote: #555;
  --code-bg: #f0f0f0;

  --fsize-15: 1.5rem;

  --bg-image: url("../img/bg-light.png");
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #d5e1dc;
    --secondary-color: #aed1ba;

    --color-border: #3a3a3a;
    --color-footer: #777;
    --color-quote: #aaa;
    --code-bg: #2a2a2a;

    --bg-image: url("../img/bg-dark.png");
  }
}

/* =======
  基础重置
   ======= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ====
  全局
   ==== */
body {
  font-family: "Georgia", "Noto Serif SC", serif;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-color);
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--fsize-15);
  background: var(--bg-image) no-repeat center fixed;
}

a {
  text-decoration: none;
}

hr {
  margin: 3rem 5rem;
  border: none;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    rgba(7, 84, 66, 0.6),
    transparent
  );
}

del {
  text-decoration: none;
  filter: blur(5px) grayscale(80%) opacity(40%);
  transition: filter 0.2s ease;
}
del:hover {
  filter: none;
}

strong {
  border-bottom: 2px solid var(--secondary-color);
}

/* =====
  头部
   ===== */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 3rem;
}

.site-title {
  font:
    bold var(--fsize-15) "Huiwen-mincho",
    serif;
  color: var(--text-color);
}

nav a {
  margin-left: var(--fsize-15);
  color: var(--text-color);
  font-size: 0.95rem;
}

/* =======
  文章列表
   ======= */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.post-card a,
.post-card p {
  color: var(--text-color);
}

.post-card h2 {
  font-size: 1.3rem;
  margin-bottom: 0.25rem;
}

.post-card time {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-footer);
}

/* =======
  文章详情
   ======= */
.post-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
}

.post-header h1 {
  font-size: 2rem;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  text-align: center;
  margin-top: 3vh;
  font-family: "Huiwen-mincho", serif;
}

.post-header time {
  font-size: 0.9rem;
  color: var(--color-footer);
}

.post-content a,
.post-header a {
  color: var(--link-color);
}

.post-content h2 {
  font-family: "STDongGuanTi", serif;
  font-size: var(--fsize-15);
  margin: 2rem 0 1rem;
}
.post-content h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.75rem;
  text-align: center;
}
.post-content p {
  margin-bottom: 1.25rem;
}
.post-content ul,
.post-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.post-content li {
  margin-bottom: 0.25rem;
}

.post-content code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: "Fira Code", "Courier New", monospace;
  margin: 0.2em 0.4em;
}

.post-content pre {
  padding: 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.25rem;
}

.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.9em;
}

.post-content blockquote {
  border-left: 4px solid var(--secondary-color);
  padding-left: 1rem;
  color: var(--color-quote);
  font-style: italic;
  margin-bottom: 1.25rem;
}

/* =====
  底部
   ===== */
footer {
  text-align: center;
  padding: 3rem 0 2rem;
  color: var(--color-footer);
  font-size: 0.85rem;
  margin-top: 4rem;
}
footer a {
  color: var(--color-footer);
}

/* ======
  响应式
   ====== */
@media (max-width: 600px) {
  body {
    font-size: 16px;
  }
  .site-header {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
  nav a:first-child {
    margin-left: 0;
  }
  .post-header h1 {
    font-size: var(--fsize-15);
  }
  .post-content h2 {
    font-size: 1.3rem;
  }
}