/* ===================================
 *  base.css — 基础重置与排版
 * =================================== */

:root {
  --color-bg:          #fff;
  --color-text:        #111;
  --color-text-light:  #555;
  --color-text-lighter:#888;
  --color-border:      #ddd;
  --color-sidebar-bg:  #f8f8f8;
  --color-code-bg:     #f4f4f4;
  --color-hover:       #000;
  --sidebar-width:     260px;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  color: var(--color-text);
  background: var(--color-bg);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  color: var(--color-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
  margin: 1rem auto;
}

code, pre {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  font-size: 0.9em;
}

pre {
  background: var(--color-code-bg);
  padding: 1rem;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.85rem;
}

code {
  background: var(--color-code-bg);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

pre code {
  background: none;
  padding: 0;
}

blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--color-text-light);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.4;
  margin: 2rem 0 0.8rem;
  font-weight: 600;
}
h1 { font-size: 1.8rem; margin-top: 0; }
h2 { font-size: 1.4rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3rem; }
h3 { font-size: 1.2rem; }

p { margin: 0.8rem 0; }

ul, ol { padding-left: 1.5rem; margin: 0.5rem 0; }
li { margin: 0.3rem 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
th, td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.8rem;
  text-align: left;
}
th { background: var(--color-sidebar-bg); font-weight: 600; }

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

/* ---- Better nested list spacing ---- */
ul ul, ul ol, ol ul, ol ol {
  margin: 0.2rem 0;
}

/* Line breaks in poems */
br {
  content: "";
  display: block;
  margin: 0.25rem 0;
}

/* Blockquote inner spacing */
blockquote p {
  margin: 0.3rem 0;
}

/* Image inside blockquote (avatar effect paragraph) */
blockquote img {
  margin: 0.5rem auto;
}

/* Horizontal scroll for wide tables */
table {
  display: block;
  overflow-x: auto;
}

/* Friend links page / intro page list spacing */
.content ul li > a:only-child {
  font-weight: 500;
}

::selection {
  background: #111;
  color: #fff;
}

/* ---- Layout ---- */
.layout-wrapper {
  display: flex;
  min-height: 100vh;
}

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.content {
  flex: 1;
  max-width: 800px;
  padding: 2rem 2.5rem;
  width: 100%;
}

/* ---- Responsive ---- */
.sidebar-toggle-btn {
  display: none;
  position: fixed;
  top: 0.8rem;
  left: 0.8rem;
  z-index: 20;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.3rem 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  user-select: none;
}

.sidebar-checkbox { display: none; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 8;
}

@media (max-width: 768px) {
  .sidebar-toggle-btn { display: block; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 10;
  }

  #sidebar-toggle:checked ~ .layout-wrapper .sidebar {
    transform: translateX(0);
  }

  #sidebar-toggle:checked ~ .sidebar-overlay {
    display: block;
  }

  .content {
    padding: 1.5rem 1rem;
  }
}