/* 狸狸英语 — 静态博客全局样式：低饱和、多色层次、护眼、响应式 */

:root {
  --bg: #f5f3ef;
  --bg-card: #fffcf9;
  --bg-card-alt: #fbfcfe;
  --border: #e4dfd6;
  --border-soft: rgba(100, 90, 75, 0.08);
  --text: #383838;
  --text-muted: #6a6a6a;
  --accent: #7fa08f;
  --accent-soft: #dfe9e3;
  --accent-text: #3d5c4d;
  --accent-2: #8aa7b8;
  --accent-2-soft: #e4ecf2;
  --accent-2-text: #4a6574;
  --accent-3: #c4a574;
  --accent-3-soft: #f2e8d8;
  --accent-3-text: #7a623f;
  --highlight: #c4a574;
  --highlight-soft: #f3ebe0;
  --strip-a: #8fb39e;
  --strip-b: #95b4c9;
  --strip-c: #c9a882;
  --radius: 14px;
  --shadow: 0 2px 8px rgba(55, 48, 40, 0.06);
  --shadow-hover: 0 6px 20px rgba(55, 48, 40, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --line: 1.75;
  --nav-h: 56px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: var(--line);
  color: var(--text);
  background-color: var(--bg);
  background-image: radial-gradient(
      ellipse 90% 55% at 12% -8%,
      rgba(149, 180, 201, 0.2) 0%,
      transparent 58%
    ),
    radial-gradient(
      ellipse 70% 45% at 92% 4%,
      rgba(143, 179, 158, 0.16) 0%,
      transparent 52%
    ),
    radial-gradient(
      ellipse 55% 40% at 50% 100%,
      rgba(232, 212, 196, 0.35) 0%,
      transparent 55%
    ),
    linear-gradient(168deg, #faf8f5 0%, #f3f5f4 42%, #f7f4f0 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(127, 160, 143, 0.28);
  color: var(--text);
}

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

a:hover {
  color: var(--accent-2-text);
  text-decoration: underline;
}

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

/* 顶部固定导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: linear-gradient(
      180deg,
      rgba(255, 252, 249, 0.94) 0%,
      rgba(245, 248, 246, 0.9) 100%
    );
  border-bottom: 1px solid var(--border-soft);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.65) inset;
  backdrop-filter: blur(10px);
}

.site-header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-text);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
}

.site-title a {
  color: inherit;
  text-decoration: none;
}

.site-title a:hover {
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
}

.nav a {
  color: var(--text-muted);
  padding: 0.4rem 0.55rem;
  text-decoration: none;
  border-radius: 8px;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.nav a:hover {
  color: var(--accent-text);
  text-decoration: none;
  background: linear-gradient(
    135deg,
    rgba(223, 233, 227, 0.55) 0%,
    rgba(228, 236, 242, 0.45) 100%
  );
}

.nav a.is-active {
  color: var(--accent-2-text);
  font-weight: 500;
  background: rgba(228, 236, 242, 0.35);
  border-bottom-color: var(--accent-2);
}

/* 布局 */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.main {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (max-width: 860px) {
  .sidebar {
    position: static;
    order: -1;
  }
}

.sidebar-card {
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-soft);
  position: relative;
  overflow: hidden;
}

.sidebar-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
  opacity: 0.85;
}

.sidebar-card:nth-child(1) {
  background: linear-gradient(145deg, #fefffc 0%, #f2f8f4 100%);
}

.sidebar-card:nth-child(1)::before {
  background: linear-gradient(90deg, var(--strip-a), #a8c9b5);
}

.sidebar-card:nth-child(1) h2 {
  color: var(--accent-text);
}

.sidebar-card:nth-child(2) {
  background: linear-gradient(145deg, #fdfdff 0%, #eef4f8 100%);
}

.sidebar-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--accent-2), #b8cdda);
}

.sidebar-card:nth-child(2) h2 {
  color: var(--accent-2-text);
}

.sidebar-card:nth-child(3) {
  background: linear-gradient(145deg, #fffdfa 0%, #faf3ec 100%);
}

.sidebar-card:nth-child(3)::before {
  background: linear-gradient(90deg, var(--strip-c), #dbc4a8);
}

.sidebar-card:nth-child(3) h2 {
  color: var(--accent-3-text);
}

.sidebar-card h2 {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0.02em;
}

.sidebar-stat {
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent-text);
  line-height: 1.2;
}

.sidebar-stat span {
  display: block;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.sidebar-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text);
}

/* 首页区块 */
.page-intro {
  margin-bottom: 2rem;
}

.page-intro .main-heading {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: #2f3d38;
  letter-spacing: 0.02em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-intro p {
  margin: 0;
  color: var(--text-muted);
  max-width: 42em;
}

.page-intro code {
  font-size: 0.9em;
  background: linear-gradient(120deg, var(--accent-soft), var(--accent-2-soft));
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border-soft);
}

.section-lead {
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* 文章卡片 */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

article.post-card {
  background: linear-gradient(
    145deg,
    rgba(255, 252, 249, 0.98) 0%,
    rgba(251, 252, 254, 0.95) 55%,
    rgba(255, 250, 245, 0.92) 100%
  );
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.35rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-list > article.post-card:nth-child(3n + 1) {
  box-shadow: var(--shadow), inset 4px 0 0 var(--strip-a);
}

.post-list > article.post-card:nth-child(3n + 2) {
  box-shadow: var(--shadow), inset 4px 0 0 var(--strip-b);
}

.post-list > article.post-card:nth-child(3n + 3) {
  box-shadow: var(--shadow), inset 4px 0 0 var(--strip-c);
}

article.post-card:hover {
  box-shadow: var(--shadow-hover), inset 4px 0 0 var(--strip-a);
  border-color: rgba(143, 179, 158, 0.22);
}

.post-list > article.post-card:nth-child(3n + 2):hover {
  box-shadow: var(--shadow-hover), inset 4px 0 0 var(--strip-b);
  border-color: rgba(149, 180, 201, 0.25);
}

.post-list > article.post-card:nth-child(3n + 3):hover {
  box-shadow: var(--shadow-hover), inset 4px 0 0 var(--strip-c);
  border-color: rgba(201, 168, 130, 0.28);
}

.post-card__meta {
  font-size: 0.8125rem;
  color: var(--accent-2-text);
  margin-bottom: 0.5rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.post-card h3 {
  margin: 0 0 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: #2f3533;
}

.post-card__body {
  color: var(--text);
}

.post-card__body p {
  margin: 0 0 1rem;
}

.post-card__body p:last-child {
  margin-bottom: 0;
}

/* 学习记录字段块 */
.record-fields {
  margin-top: 1rem;
  padding: 1rem 1.05rem;
  border-radius: 10px;
  border: 1px solid var(--border-soft);
  background: linear-gradient(
    160deg,
    rgba(223, 233, 227, 0.35) 0%,
    rgba(228, 236, 242, 0.28) 45%,
    rgba(242, 232, 216, 0.22) 100%
  );
  display: grid;
  gap: 0.65rem;
}

.record-field {
  font-size: 0.9375rem;
}

.record-field strong {
  display: inline-block;
  min-width: 5.5em;
  color: var(--accent-text);
  font-weight: 600;
}

/* 关于页、纯文本页 */
.prose {
  background: linear-gradient(155deg, #fffefb 0%, #f5f9f7 40%, #f8f6fc 100%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.75);
  max-width: 42em;
}

.prose .main-heading {
  margin-top: 0;
  font-size: 1.35rem;
}

.prose code {
  font-size: 0.9em;
  background: linear-gradient(120deg, var(--accent-soft), var(--accent-2-soft));
  padding: 0.1em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border-soft);
}

.prose ul {
  padding-left: 1.25rem;
}

/* 单词/阅读简易列表 */
.simple-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  background: linear-gradient(180deg, #fffefc 0%, #faf9ff 100%);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow);
}

.simple-table th,
.simple-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
}

.simple-table th {
  background: linear-gradient(
    105deg,
    #dfe9e3 0%,
    #dce6ee 50%,
    #e8e4dc 100%
  );
  color: var(--accent-text);
  font-weight: 600;
  font-size: 0.8125rem;
}

.simple-table tbody tr:nth-child(even) {
  background: rgba(228, 236, 242, 0.22);
}

.simple-table tbody tr:hover {
  background: rgba(223, 233, 227, 0.35);
}

.simple-table tr:last-child td {
  border-bottom: none;
}

/* 页脚 */
.site-footer {
  margin-top: auto;
  padding: 1.5rem 1.25rem;
  border-top: 1px solid var(--border-soft);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
  background: linear-gradient(
    180deg,
    rgba(245, 248, 246, 0.95) 0%,
    rgba(238, 242, 248, 0.9) 45%,
    rgba(250, 245, 240, 0.92) 100%
  );
}

.site-footer p {
  margin: 0.25rem 0;
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* 页面外壳：页脚贴底 */
.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-shell > .layout {
  flex: 1;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  background: var(--accent-text);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 200;
}

.skip-link:focus {
  left: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  article.post-card {
    transition: none;
  }
}