:root {
  --kiwi-green: #8BC34A;
  --kiwi-dark: #1A1A2E;
  --kiwi-yellow: #F9E547;
  --kiwi-ice: #A0D8EF;
  --kiwi-midnight: #16213E;
  --kiwi-white: #FFFFFF;
  --kiwi-gray: #E0E0E0;
  --kiwi-dark-green: #33691E;
  --kiwi-red: #FF5252;
  --kiwi-cream: #FFF8E1;

  --font-heading: 'Arial Black', 'Noto Sans SC', system-ui, sans-serif;
  --font-body: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'Roboto Mono', 'Courier New', monospace;
}

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

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

body {
  background-color: var(--kiwi-dark);
  background-image:
    linear-gradient(rgba(139,195,74,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,195,74,.04) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--kiwi-white);
  font-family: var(--font-body);
  line-height: 1.7;
  min-height: 100vh;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

:focus-visible {
  outline: 3px solid var(--kiwi-yellow);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}

/* ===================== 滚动进度条 ===================== */
.kiwi-scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--kiwi-yellow);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 1500;
}

/* ===================== 跳转链接 ===================== */
.kiwi-skiplink {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 2000;
  background: var(--kiwi-yellow);
  color: var(--kiwi-dark);
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-weight: bold;
}

.kiwi-skiplink:focus {
  left: 50%;
  transform: translateX(-50%);
}

/* ===================== 头部框架 ===================== */
.kiwi-header {
  position: fixed;
  left: 0;
  top: 0;
  width: 280px;
  height: 100vh;
  background-color: var(--kiwi-dark);
  border-right: 2px solid var(--kiwi-midnight);
  display: flex;
  flex-direction: column;
  z-index: 1000;
}

.kiwi-header__brand {
  padding: 24px;
  border-bottom: 1px solid var(--kiwi-midnight);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.kiwi-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.kiwi-logo__slice {
  width: 8px;
  height: 26px;
  display: inline-block;
}

.kiwi-logo__slice--green {
  background: var(--kiwi-green);
  clip-path: polygon(0 0, 100% 0, 60% 100%, 0% 100%);
}

.kiwi-logo__slice--yellow {
  background: var(--kiwi-yellow);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 40% 100%);
}

.kiwi-logo__text {
  font-family: var(--font-heading);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--kiwi-white);
  -webkit-text-stroke: 1px rgba(255, 255, 255, .2);
  white-space: nowrap;
}

.kiwi-header__badge {
  background: var(--kiwi-midnight);
  color: var(--kiwi-ice);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 8px;
  border-left: 2px solid var(--kiwi-ice);
  display: inline-block;
}

/* ===================== 导航 ===================== */
.kiwi-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 0;
}

.kiwi-nav__list {
  display: flex;
  flex-direction: column;
}

.kiwi-nav__item {
  margin: 4px 0;
}

.kiwi-nav__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  font-family: var(--font-mono);
  color: var(--kiwi-gray);
  position: relative;
  transition: background .2s, color .2s, padding-left .2s;
}

.kiwi-nav__link::before {
  content: attr(data-index);
  color: var(--kiwi-green);
  font-size: .8em;
  min-width: 1.5em;
}

.kiwi-nav__link:hover {
  background: var(--kiwi-midnight);
  color: var(--kiwi-white);
  padding-left: 28px;
}

.kiwi-nav__link[aria-current="page"] {
  background: var(--kiwi-midnight);
  color: var(--kiwi-yellow);
  box-shadow: inset 4px 0 0 var(--kiwi-yellow);
}

.kiwi-header__foot {
  padding: 24px;
  border-top: 1px solid var(--kiwi-midnight);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--kiwi-gray);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ===================== 移动端导航 ===================== */
.kiwi-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  align-items: center;
}

.kiwi-nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--kiwi-white);
  transition: transform .2s, opacity .2s;
}

.kiwi-nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--kiwi-gray);
}

@media (max-width: 768px) {
  .kiwi-header {
    position: sticky;
    top: 0;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 2px solid var(--kiwi-midnight);
    background-color: rgba(26, 26, 46, .95);
    backdrop-filter: blur(8px);
  }

  .kiwi-header__brand {
    width: 100%;
  }

  .kiwi-nav-toggle {
    display: flex;
  }

  .kiwi-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--kiwi-dark);
    border-bottom: 2px solid var(--kiwi-midnight);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }

  .kiwi-nav[data-open] {
    display: block;
  }

  .kiwi-header__foot {
    display: none;
  }
}

/* ===================== 页脚 ===================== */
.kiwi-footer {
  background-color: var(--kiwi-midnight);
  border-top: 4px solid var(--kiwi-green);
  padding: 48px 24px;
  margin-left: 280px;
}

.kiwi-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin-inline: auto;
}

.kiwi-footer__title {
  font-family: var(--font-heading);
  color: var(--kiwi-green);
  margin-bottom: 12px;
  font-size: 14px;
  letter-spacing: .05em;
}

.kiwi-footer__logo {
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--kiwi-white);
  -webkit-text-stroke: 1px rgba(255, 255, 255, .2);
}

.kiwi-footer__desc {
  margin-top: 12px;
  color: var(--kiwi-gray);
  font-size: 14px;
}

.kiwi-footer__contact p,
.kiwi-footer__meta p {
  color: var(--kiwi-gray);
  font-size: 14px;
  margin-bottom: 8px;
}

.kiwi-footer__links ul li {
  margin-bottom: 8px;
}

.kiwi-footer__links a {
  color: var(--kiwi-ice);
  font-size: 14px;
}

.kiwi-footer__links a:hover {
  color: var(--kiwi-yellow);
  text-decoration: underline;
}

/* 平板适配 */
@media (max-width: 1024px) {
  .kiwi-header {
    width: 240px;
  }
  .kiwi-footer {
    margin-left: 240px;
  }
  .kiwi-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 移动端页脚 */
@media (max-width: 768px) {
  .kiwi-footer {
    margin-left: 0;
    padding: 32px 20px;
  }
  .kiwi-footer__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ===================== 主体布局组件 ===================== */
.kiwi-container {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: 24px;
}

.kiwi-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.kiwi-index-col {
  grid-column: span 2 / auto;
}

.kiwi-content-col {
  grid-column: span 10 / auto;
}

@media (max-width: 768px) {
  .kiwi-index-col,
  .kiwi-content-col {
    grid-column: 1 / -1;
  }
}

/* ===================== 按钮 ===================== */
.kiwi-btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-weight: bold;
  font-size: 14px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, background-color .2s, color .2s;
  color: var(--kiwi-dark);
}

.kiwi-btn--primary {
  background: var(--kiwi-green);
  clip-path: polygon(0 0, 100% 0, 94% 100%, 0% 100%);
}

.kiwi-btn--primary:hover {
  background: var(--kiwi-dark-green);
  color: var(--kiwi-white);
  transform: translateX(4px);
}

.kiwi-btn--accent {
  background: var(--kiwi-yellow);
  clip-path: polygon(6% 0, 100% 0, 100% 100%, 0% 100%);
}

.kiwi-btn--accent:hover {
  box-shadow: 4px 4px 0 var(--kiwi-ice);
  transform: translate(-2px, -2px);
}

/* ===================== 卡片 ===================== */
.kiwi-card {
  background: var(--kiwi-midnight);
  border: 1px solid rgba(139, 195, 74, .3);
  padding: 24px;
  transition: border-color .2s, transform .2s;
}

.kiwi-card:hover {
  border-color: var(--kiwi-green);
  transform: translateY(-4px);
}

/* ===================== 章节标题 ===================== */
.kiwi-section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  line-height: 1.2;
  margin-bottom: 24px;
  display: inline-block;
  color: var(--kiwi-white);
}

.kiwi-section-title::before {
  content: '// ';
  color: var(--kiwi-green);
  font-family: var(--font-mono);
}

/* ===================== 标签 ===================== */
.kiwi-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 8px;
  background: var(--kiwi-midnight);
  color: var(--kiwi-ice);
  border-left: 2px solid var(--kiwi-ice);
  vertical-align: middle;
}

/* ===================== 图片占位 ===================== */
.kiwi-image-placeholder {
  position: relative;
  background: var(--kiwi-midnight);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.kiwi-image-placeholder::before {
  content: 'IMG';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 24px;
  color: rgba(160, 216, 239, .3);
}

.kiwi-image-placeholder--portrait {
  aspect-ratio: 4 / 5;
}

.kiwi-image-placeholder--square {
  aspect-ratio: 1 / 1;
}

/* ===================== 滚动显现 ===================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .3s ease, transform .3s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}