/* ============================================
   个人博客全局样式
   宽度体系（按窗口宽窄两档）：
   窗口较窄（<1024px）：标题栏 95%，首页卡片 100%，正文 100%，评论区 100%
   窗口较宽（≥1024px）：标题栏 80%，首页卡片 45%，正文 60%，评论区 60%
   页尾栏：任何情况下均为 100% 宽
   设计基调：简洁、留白、舒适阅读
   ============================================ */

:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #2d2a26;
  --color-text-secondary: #6b675f;
  --color-accent: #c0392b;
  --color-border: #e8e4de;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* 前台页面：页尾始终贴底（内容不足一屏时也在最下方） */
body:not(.admin-body) {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* ---------- 顶部导航（85%） ---------- */

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

.header-inner {
  width: 95%;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.logo span {
  color: var(--color-accent);
}

.nav-list {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-list a {
  color: var(--color-text);
  font-size: 15px;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-accent);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ---------- 文章列表 ---------- */

/* 首页卡片：窄窗口 100%，宽窗口 45% */
.main {
  flex: 1 0 auto;
  width: 100%;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.25s, transform 0.25s;
}

.post-card:hover {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
  transform: translateY(-2px);
}

/* 整张卡片可点击：标题链接的覆盖层撑满整卡 */
.post-card.stretched {
  position: relative;
}

.post-card.stretched h2 a::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
}

.post-card.stretched:hover h2 a {
  color: var(--color-accent);
}

.post-card h2 {
  font-family: var(--font-serif);
  font-size: 24px;
  margin-bottom: 8px;
}

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

.post-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.post-card .excerpt {
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* ---------- 文章页 ---------- */

/* 正文：窄窗口 100%，宽窗口 60% */
.article {
  flex: 1 0 auto;
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.article-header {
  margin-bottom: 40px;
}

.article-header h1 {
  font-family: var(--font-serif);
  font-size: 36px;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-body {
  font-size: 16.5px;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  margin: 32px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 18px 24px;
}

.article-body li {
  margin-bottom: 6px;
}

.article-body code {
  background: #f0ede8;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.article-body pre {
  background: #2d2a26;
  color: #f5f2ef;
  padding: 18px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: 18px;
  font-size: 14px;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body blockquote {
  border-left: 4px solid var(--color-accent);
  background: #f6f2ed;
  padding: 12px 18px;
  margin: 0 0 18px;
  color: var(--color-text-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.article-body img {
  max-width: 100%;
  border-radius: var(--radius);
}

.article-body video,
.article-body audio {
  display: block;
  max-width: 100%;
  margin: 18px 0;
  border-radius: var(--radius);
}

.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 关于页 ---------- */

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-top: 24px;
}

.about-card h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.social-links {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* ---------- 页脚（始终 100% 宽，无背景无分隔线与主页一致） ---------- */

.site-footer {
  width: 100%;
  margin: 0 auto;
  padding: 2px 24px;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: -0.3px;
}

/* 页脚文字保留换行 */
.site-footer p {
  white-space: pre-line;
}

/* ---------- 导航用户入口 ---------- */

.nav-user {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
}

.nav-logout {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.nav-logout:hover {
  color: var(--color-accent);
}

/* ---------- 管理员徽章 ---------- */

.badge-admin {
  display: inline-block;
  padding: 1px 7px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.6;
  border-radius: 999px;
  background: var(--color-accent);
  color: #fff;
  vertical-align: middle;
}

/* ---------- 登录 / 注册 ---------- */

.auth-wrap {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding-top: 64px;
}

.auth-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.auth-card h1 {
  font-family: var(--font-serif);
  font-size: 24px;
  text-align: center;
}

.auth-sub {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 14px;
  margin: 6px 0 24px;
}

.auth-card .form-field {
  margin-bottom: 18px;
}

.auth-card label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.auth-card input[type="text"],
.auth-card input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.auth-card input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.12);
}

.auth-card .btn-block {
  display: block;
  width: 100%;
  text-align: center;
  padding: 11px;
  font-size: 15px;
}

.auth-foot {
  text-align: center;
  font-size: 14px;
  margin-top: 18px;
  color: var(--color-text-secondary);
}

.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-bottom: 18px;
}

.alert-error {
  background: #fdf1f0;
  color: #b71c1c;
  border: 1px solid #f3c9c5;
}

/* ---------- 评论区 ---------- */

/* 评论区：窄窗口 100%，宽窗口 60%，与正文同步 */
.comments {
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.comments-title {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.comments-count {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.comment-list {
  list-style: none;
  margin-bottom: 28px;
}

.comment-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.comment-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.comment-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.comment-author {
  font-size: 14px;
  font-weight: 600;
}

.comment-time {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.comment-content {
  font-size: 15px;
  line-height: 1.7;
  word-break: break-word;
}

/* ---------- 评论回复 ---------- */

.reply-toggle {
  margin-top: 8px;
  padding: 3px 12px;
  font-size: 12px;
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.reply-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.comment-replies {
  list-style: none;
  margin: 14px 0 4px 20px;
  padding-left: 18px;
  border-left: 2px solid var(--color-border);
}

.comment-replies .comment-item {
  border-bottom: none;
  padding: 8px 0;
}

.reply-form {
  margin-top: 12px;
}

.reply-form textarea {
  font-size: 14px;
}

.comments-empty {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}

.comment-form textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.comment-form textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.12);
}

.comment-form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.comment-as {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.comments-login-tip {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 16px;
  text-align: center;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}

/* ---------- 返回顶部 ---------- */

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-text);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 18px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.back-top.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 移动端（≤640px）----------
   切换为抽屉菜单，并整体缩小字号与间距 */

@media (max-width: 640px) {
  .header-inner {
    padding: 0 8px 0 16px;
    height: 52px;
  }

  .logo {
    font-size: 18px;
  }

  .menu-toggle {
    display: block;
    /* 顶掉中间的空 nav flex 占位，使按钮贴到最右侧 */
    margin-left: auto;
  }

  .nav-list {
    position: fixed;
    top: 52px;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    width: 200px;
    padding: 16px 24px;
    gap: 16px;
    border-left: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0 0 0 var(--radius);
    transform: translateX(100%);
    transition: transform 0.3s;
    z-index: 15;
  }

  .nav-list.open {
    transform: translateX(0);
  }

  /* ---- 整体缩小 ---- */

  .main {
    padding: 20px 16px 56px;
  }

  .post-list {
    gap: 16px;
  }

  .post-card {
    padding: 18px 16px;
  }

  .post-card h2 {
    font-size: 20px;
  }

  .post-card .excerpt {
    font-size: 14px;
  }

  .post-meta {
    font-size: 12px;
  }

  .article {
    padding: 24px 16px 56px;
  }

  .article-header {
    margin-bottom: 24px;
  }

  .article-header h1 {
    font-size: 24px;
  }

  .article-body {
    font-size: 15px;
  }

  .article-body h2 {
    font-size: 20px;
    margin: 28px 0 12px;
  }

  .article-body h3 {
    font-size: 17px;
    margin: 24px 0 10px;
  }

  .article-body pre {
    padding: 14px 16px;
    font-size: 13px;
  }

  .comments {
    padding: 0 16px 56px;
  }

  .comments-title {
    font-size: 19px;
    margin-bottom: 14px;
  }

  .comment-content {
    font-size: 14px;
  }

  .comment-form textarea {
    font-size: 14px;
  }

  .comment-replies {
    margin-left: 10px;
    padding-left: 12px;
  }

  .auth-wrap {
    padding-top: 28px;
  }

  .auth-card {
    padding: 24px 18px;
  }

  .auth-card h1 {
    font-size: 21px;
  }

  .about-card {
    padding: 24px 18px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 36px;
    height: 36px;
    font-size: 15px;
  }
}

/* ---------- 窗口较宽时（≥1024px）----------
   标题栏 80%，首页卡片 45%，正文/评论区 60% */

@media (min-width: 1024px) {
  .header-inner {
    width: 80%;
  }

  .main {
    width: 45%;
  }

  .article {
    width: 60%;
  }

  .comments {
    width: 60%;
  }

  /* 登录/注册卡片保持固定窄宽，不受 .main 45% 影响 */
  .auth-wrap {
    width: 100%;
    max-width: 480px;
  }
}