/* ============================================
   我道呀的博客 - 基础样式
   结构：变量 → 重置 → 布局 → 组件 → 响应式
   ============================================ */

/* ---------- 1. 主题变量 ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f6f7f9;
  --color-text: #1f2328;
  --color-text-soft: #5c6370;
  --color-border: #e5e7eb;
  --color-primary: #2f6fed;
  --color-primary-soft: #eaf0fe;

  --max-width: 760px;
  --radius: 10px;
  --space: 1rem;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* 手动切换的深色主题 */
[data-theme="dark"] {
  --color-bg: #16181d;
  --color-bg-soft: #1e2127;
  --color-text: #e6e8eb;
  --color-text-soft: #9aa3af;
  --color-border: #2c3038;
  --color-primary: #6b9bff;
  --color-primary-soft: #1f2a42;
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1em;
  overflow-x: auto;
}

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

/* ---------- 3. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 58px;
}

.site-logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  white-space: nowrap;
}

.site-logo:hover {
  text-decoration: none;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  color: var(--color-text-soft);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-bg-soft);
  text-decoration: none;
}

main {
  padding: 2.5rem 0 3rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  color: var(--color-text-soft);
  font-size: 0.88rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: space-between;
}

/* ---------- 4. 组件 ---------- */
.hero {
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-size: 2rem;
}

.hero p {
  color: var(--color-text-soft);
  font-size: 1.05rem;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  font-size: 0.9rem;
  line-height: 1;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
}

.btn:hover {
  background: var(--color-bg-soft);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.08);
  background: var(--color-primary);
}

/* 文章列表 */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list > li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list > li:first-child {
  padding-top: 0;
}

.post-list h2 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.post-list h2 a {
  color: var(--color-text);
}

.post-list h2 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.post-meta {
  color: var(--color-text-soft);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.post-excerpt {
  color: var(--color-text-soft);
  font-size: 0.95rem;
  margin: 0.5rem 0 0;
}

.tag {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 999px;
  padding: 0.05rem 0.55rem;
}

/* 文章正文 */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
  font-size: 1.9rem;
}

.article-body h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
}

.article-body h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
}

.article-body blockquote {
  margin: 1.2em 0;
  padding: 0.2em 1em;
  border-left: 3px solid var(--color-border);
  color: var(--color-text-soft);
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
}

.article-nav {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.92rem;
}

/* 提示 / 空状态 */
.empty {
  color: var(--color-text-soft);
  text-align: center;
  padding: 3rem 0;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}

/* 视觉隐藏（仅读屏可见） */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 响应式 ---------- */
@media (max-width: 520px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .site-nav a {
    padding: 0.35rem 0.45rem;
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}