/* 全局样式变量 */
:root {
  --page-bg: #F6F0E8;
  --ink: #5A5145;
  --ink-weak: #776E62;
  --accent: #6D6256;
  --accent-hover: #4E463C;
  --muted-bg: #EFE6DA;
  --card-bg: transparent;
  --border: rgba(90, 81, 69, .18);
  --shadow: rgba(90, 81, 69, .08);
  --selection-bg: #ECDDCB;
  --selection-ink: #3F382F;

  /* 布局尺寸变量 */
  --page-max: 1380px;
  --left-lane: 340px;
  --gap: 48px;
  --right-lane: 860px;
}

/* 基础样式重置与全局设置 */
html,
body {
  height: 100%;
  background: transparent !important;
  margin: 0;
  background-color: var(--page-bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 文本选中样式 */
::selection {
  background: var(--selection-bg);
  color: var(--selection-ink);
}

/* 页面背景设置 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("https://static.igem.wiki/teams/5550/pic/other/back-ground.webp") center/cover no-repeat fixed;
}

/* 主内容区域布局 */
#page-content {
  flex: 1 0 auto;
  padding: 32px 0 48px;
  background: transparent !important;
}

/* 页面外壳布局 */
.page-shell {
  background-color: transparent;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 40px;
  grid-template-columns:
    minmax(0, 1fr) var(--left-lane) var(--gap) minmax(0, var(--right-lane)) minmax(0, 1fr);
  column-gap: 0;
  max-width: var(--page-max);
  padding: 24px 24px 32px;
}

/* 侧边栏样式 */
.side-nav {
  grid-column: 2;
  justify-self: center;
  position: sticky;
  top: 110px;
  align-self: start;
  margin-right: 250px;
}

.side-nav nav {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.side-nav .side-link {
  font-size: 26px;
  font-weight: 800;
  color: #f0ca3a;
  text-decoration: none;
  -webkit-text-stroke: 1px rgba(0, 0, 0, .3);
  text-shadow:
    0 1px 0 rgba(0, 0, 0, .35),
    0 3px 6px rgba(0, 0, 0, .25);
  transition: transform .15s ease, opacity .15s ease, filter .15s ease, background .15s ease;
  padding: 0 0;
  border-radius: 10px;
  white-space: nowrap;
  margin: 1rem 1rem;
}

.side-nav .side-link:hover {
  transform: translateX(2px);
  opacity: 1;
  background-color: #f0e9df;
}

.side-nav .side-link.active {
  background: rgba(240, 202, 58, .18);
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, .25));
}

/* 内容区域样式 */
.content-col {
  grid-column: 4;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, .06);
  border-radius: 16px;
  box-shadow: 0 18px 36px rgba(0, 0, 0, .18);
  padding: 40px 48px;
  width: 100%;
  max-width: var(--right-lane);
  margin-left: auto;
  margin-right: auto;
}

/* 内容分区样式 */
.section-blank {
  position: relative;
  background: transparent;
  border: none;
  box-shadow: none;
  scroll-margin-top: 110px;
  padding: 60px 0;
  border-bottom: 1px solid rgba(0, 0, 0, .08);
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: #f9f7f4;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.section-blank:last-child {
  border-bottom: none;
}

/* 通用元素样式 */
h1,
h2,
h3,
h4,
h5,
h6,
p,
li,
dd,
dt,
blockquote {
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s ease, background-color .15s ease;
}

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

hr {
  border: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
  opacity: .95;
}

/* pre,
code, */
kbd,
samp {
  background: var(--muted-bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
}

/* pre {
  padding: 14px 16px;
  overflow: auto;
}

code {
  padding: 2px 6px;
} */

/* 更改pre和code的样式 */
/* 代码块样式 */
pre {
  background: #f8f8f8;
  padding: 15px;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.4;
  margin: 1rem 0;
  /* font-family: 'Courier New', monospace; */
}

/* 内联代码样式 */
code {
  background: #f0f0f0;
  padding: 2px 6px;
  border-radius: 3px;
  /* font-family: 'Courier New', monospace; */
  color: #c7254e;
  font-size: 1em;
}

/* 代码块内的代码元素重置样式 */
pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
}

.btn,
button:not(.navbar-toggler) {
  background: var(--card-bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: 8px 14px;
  box-shadow: 0 8px 18px var(--shadow);
  transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease;
}

.btn:hover,
button:not(.navbar-toggler):hover {
  background: var(--muted-bg);
  transform: translateY(-1px);
  box-shadow: 0 12px 28px var(--shadow);
}

input,
select,
textarea {
  background: #FBF6EE;
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: #BBAA95;
  box-shadow: 0 0 0 3px rgba(187, 170, 149, .25);
}

.card,
.surface,
.paper,
.container,
.content,
.page,
main {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 18px 36px var(--shadow);
  color: var(--ink);
}

/* 实验步骤相关样式 */
.protocol-step {
  margin: 0.8rem 0 0.8rem 1.2rem;
  list-style-type: decimal;
}

.protocol-substep {
  margin: 0.5rem 0 0.5rem 2rem;
  list-style-type: lower-alpha;
}

.protocol-system {
  background-color: #f0ebe2;
  padding: 0.8rem;
  border-left: 3px solid #c9b89c;
  margin: 1rem 0;
}

/* 结果页面特有样式 */
.result-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.result-table th,
.result-table td {
  border: 1px solid #d4c2a4;
  padding: 0.8rem;
  text-align: left;
}

.result-table th {
  background-color: #f0ebe2;
  color: #7a5c3a;
}

.figure-container {
  width: 100%;
  height: 300px;
  border: 1px dashed #c9b89c;
  border-radius: 4px;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fdfbf8;
}

/* 图片留位 */
/* .figure-placeholder {
  color: #8b6e42;
  font-size: 0.95rem;
  text-align: center;
  padding: 0 1rem;
} */

.figure-note {
  color: #6d573c;
  font-size: 0.9rem;
  font-style: italic;
  margin: 0.5rem 0 1.5rem;
  text-align: center;
}

.main-title {
  text-align: center;
  color: #7a5c3a;
  font-size: 2rem;
  margin: 1.5rem 0 2rem;
  font-weight: bold;
  border-bottom: 2px solid #f0e9df;
  padding-bottom: 0.8rem;
}

/* 标题样式 */
h3 {
  color: #8b6e42;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid #d4c2a4;
  padding-bottom: 0.5rem;
}

h4 {
  color: #6d573c;
  margin: 1rem 0 0.8rem;
}

h5 {
  color: #5a462e;
  margin: 1rem 0 0.5rem;
}


/* 响应式布局 - 中屏 */
@media (max-width: 1280px) {
  :root {
    --left-lane: 300px;
    --gap: 40px;
    --right-lane: 760px;
    --page-max: 1200px;
  }
}

/* 响应式布局 - 小屏 */
@media (max-width: 992px) {
  .page-shell {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 16px;
  }

  .side-nav {
    grid-column: 1;
    justify-self: center;
    position: static;
    margin-bottom: 16px;
    margin-right: 0;
  }

  .side-nav nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
  }

  .side-nav .side-link {
    font-size: 18px;
  }

  .content-col {
    grid-column: 1;
  }

}

/* 响应式布局 - 窄屏 */
@media (max-width: 980px) {
  .page-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .side-nav {
    grid-column: 1;
    justify-self: center;
    position: static;
    margin-bottom: 16px;
  }

  .content-col {
    grid-column: 1;
  }
}