:root {
  --gcai-purple: #5a2f62;
  --gcai-purple-rgb: 90, 47, 98;
  --gcai-purple-bright: #c088ca;
  --gcai-mint: #37d69a;
  --gcai-mint-soft: #9af2c9;
  --gcai-ink: #261b29;
  --gcai-paper: #fbf8fc;
  --gcai-grid-light: rgba(90, 47, 98, 0.035);
  --gcai-grid-dark: rgba(154, 242, 201, 0.026);
  --md-text-font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --md-code-font: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

[data-md-color-scheme="default"] {
  color-scheme: light;
  --md-default-bg-color: #fbf8fc;
  --md-default-fg-color: #261b29;
  --md-default-fg-color--light: rgba(38, 27, 41, 0.7);
  --md-default-fg-color--lighter: rgba(38, 27, 41, 0.42);
  --md-primary-fg-color: #5a2f62;
  --md-primary-fg-color--light: #806087;
  --md-primary-fg-color--dark: #412248;
  --md-primary-bg-color: #ffffff;
  --md-accent-fg-color: #7d4388;
  --md-typeset-a-color: #6f3779;
  --md-code-bg-color: rgba(90, 47, 98, 0.07);
  --md-code-fg-color: #3d2642;
  --md-footer-bg-color: #35223a;
  --md-footer-bg-color--dark: #261a2a;
}

[data-md-color-scheme="slate"] {
  color-scheme: dark;
  --md-default-bg-color: #101315;
  --md-default-fg-color: #f2fff8;
  --md-default-fg-color--light: rgba(242, 255, 248, 0.72);
  --md-default-fg-color--lighter: rgba(242, 255, 248, 0.45);
  --md-primary-fg-color: #182022;
  --md-primary-fg-color--light: #243033;
  --md-primary-fg-color--dark: #101516;
  --md-primary-bg-color: #f2fff8;
  --md-accent-fg-color: #9af2c9;
  --md-typeset-a-color: #70e5b1;
  --md-code-bg-color: rgba(154, 242, 201, 0.07);
  --md-code-fg-color: #e6fff2;
  --md-footer-bg-color: #121819;
  --md-footer-bg-color--dark: #0b0f10;
}

html {
  scroll-padding-top: 5.6rem;
}

body {
  background-image:
    linear-gradient(var(--gcai-grid-light) 1px, transparent 1px),
    linear-gradient(90deg, var(--gcai-grid-light) 1px, transparent 1px);
  background-size: 32px 32px;
}

[data-md-color-scheme="slate"] body {
  background-image:
    linear-gradient(var(--gcai-grid-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--gcai-grid-dark) 1px, transparent 1px);
}

.md-grid {
  max-width: 92rem;
}

.md-header {
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--md-primary-fg-color) 94%, transparent);
}

.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  width: 1.55rem;
  height: 1.55rem;
}

/* ---- 全站共享导航（shared-shell 注入的 .nav-shell）与 MkDocs 布局协调 ---- */

/* ---- 侧栏恒定间距的结构性方案 ----
   Material 的 sticky 吸附位是为「标签栏双行头部」设计的；单行头部下改为：
   1) main 顶部边距归零 → 侧栏初始顶边 == header 底边（48px）
   2) sidebar 吸附位 top == 2.4rem == header 底边 → 初始位置与吸附位置恒等，永不跳变
   3) 呼吸间距全部由各元素自身 padding 提供（初始/吸附两态恒定存在） */
.md-main__inner {
  margin-top: 0;
}

.md-sidebar {
  top: 2.4rem;
  max-height: calc(100vh - 2.4rem);
  padding: 0.9rem 0;
}

/* 无标签栏时 Material 的 lifted 提升值不应生效 */
.md-header--lifted~.md-container .md-sidebar {
  top: 2.4rem;
}

.md-sidebar__inner {
  top: 2.4rem;
}

.md-content__inner {
  padding-top: 0.9rem;
}

.md-main__inner {
  gap: 1.1rem;
}

.md-content__inner {
  max-width: 54rem;
  margin-inline: auto;
  padding-bottom: 3.2rem;
}

.md-content__inner::before {
  display: block;
  width: 2.6rem;
  height: 0.2rem;
  margin-bottom: 1.25rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--md-typeset-a-color), var(--gcai-mint));
  content: "";
}

.md-typeset h1 {
  margin-bottom: 1.15rem;
  color: var(--md-default-fg-color);
  font-size: clamp(1.75rem, 4vw, 2.55rem);
  font-weight: 760;
  letter-spacing: -0.035em;
  line-height: 1.15;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.md-typeset h2 {
  padding-top: 0.35rem;
  border-top: 1px solid color-mix(in srgb, var(--md-default-fg-color) 12%, transparent);
  color: var(--md-default-fg-color);
  font-weight: 720;
  letter-spacing: -0.018em;
}

.md-typeset h3 {
  color: var(--md-default-fg-color);
  font-weight: 690;
}

.md-typeset p,
.md-typeset li {
  line-height: 1.82;
}

.md-typeset a:not(.headerlink) {
  text-decoration-color: color-mix(in srgb, var(--md-typeset-a-color) 42%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

.md-typeset a:not(.headerlink):hover {
  text-decoration-color: currentColor;
}

.md-nav__link--active,
.md-nav__link:focus,
.md-nav__link:hover {
  color: var(--md-typeset-a-color);
}

.md-nav__item .md-nav__link--active {
  font-weight: 700;
}

.md-sidebar--primary .md-nav__link--active {
  position: relative;
}

.md-sidebar--primary .md-nav__link--active::before {
  position: absolute;
  top: 0.22rem;
  bottom: 0.22rem;
  left: -0.55rem;
  width: 3px;
  border-radius: 999px;
  background: var(--md-accent-fg-color);
  content: "";
}

.md-sidebar--secondary .md-nav {
  border-left: 1px solid color-mix(in srgb, var(--md-default-fg-color) 12%, transparent);
  padding-left: 0.75rem;
}

.md-path {
  margin-bottom: 1rem;
  color: var(--md-default-fg-color--lighter);
  font-size: 0.62rem;
}

.md-typeset code {
  border: 1px solid color-mix(in srgb, var(--md-typeset-a-color) 18%, transparent);
  border-radius: 0.32rem;
}

.md-typeset pre > code {
  border: 0;
}

.md-typeset table:not([class]) {
  border: 1px solid color-mix(in srgb, var(--md-default-fg-color) 14%, transparent);
  border-radius: 0.55rem;
  box-shadow: 0 0.4rem 1.4rem rgba(20, 10, 24, 0.04);
}

.md-typeset table:not([class]) th {
  background: color-mix(in srgb, var(--md-typeset-a-color) 9%, var(--md-default-bg-color));
}

.md-typeset .admonition,
.md-typeset details {
  border-width: 1px;
  border-radius: 0.65rem;
  box-shadow: 0 0.35rem 1.1rem rgba(20, 10, 24, 0.05);
}

.gcai-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: 0.75rem;
  margin-block: 1.2rem;
}

.gcai-card {
  display: block;
  min-height: 7rem;
  padding: 1rem 1.05rem;
  border: 1px solid color-mix(in srgb, var(--md-default-fg-color) 13%, transparent);
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--md-default-bg-color) 92%, var(--md-typeset-a-color) 8%);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.gcai-card:hover,
.gcai-card:focus-visible {
  border-color: color-mix(in srgb, var(--md-typeset-a-color) 45%, transparent);
  box-shadow: 0 0.7rem 1.8rem rgba(20, 10, 24, 0.08);
  transform: translateY(-2px);
}

.gcai-card:focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
}

.gcai-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.58rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.gcai-status--development {
  color: #a86300;
  background: rgba(255, 180, 0, 0.08);
}

[data-md-color-scheme="slate"] .gcai-status--development {
  color: #ffd38a;
}

.md-typeset kbd {
  border-color: color-mix(in srgb, var(--md-default-fg-color) 25%, transparent);
  background: color-mix(in srgb, var(--md-default-bg-color) 82%, var(--md-default-fg-color) 6%);
  box-shadow: 0 2px 0 color-mix(in srgb, var(--md-default-fg-color) 22%, transparent);
}

:where(a, button, input, summary):focus-visible {
  outline: 2px solid var(--md-accent-fg-color);
  outline-offset: 2px;
}

@media screen and (max-width: 76.1875em) {
  .gcai-brandbar__inner {
    padding-inline: 1rem;
  }
}

@media screen and (max-width: 44.984375em) {
  .gcai-brandbar__label {
    display: none;
  }

  .gcai-brandbar__inner {
    justify-content: center;
    overflow-x: auto;
    padding-inline: 0.45rem;
  }

  .gcai-brandbar__links {
    min-width: max-content;
  }

  .gcai-brandbar__link {
    padding-inline: 0.55rem;
  }

  .md-content__inner {
    margin-inline: 0.8rem;
    padding-inline: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .md-header,
  .gcai-brandbar,
  .gcai-read-progress,
  .md-sidebar,
  .md-footer,
  .md-top {
    display: none !important;
  }

  .md-content,
  .md-content__inner {
    max-width: none;
    margin: 0;
    padding: 0;
  }

  body {
    background: #ffffff;
  }
}