/* =============================================================
   鼹鼠窝 — 复古终端 1-bit 像素风格
   主色：黑色 #000（背景主导）
   文字/边框：暖米白 #DCC9A9
   点缀：赭红 #B83A2D / 苔绿 #4E6851（卡片边框、装饰）
   ============================================================= */

/* -----------------------------------------------------------
   1. CSS 设计令牌
   ----------------------------------------------------------- */
:root {
  --color-black:  #000000;
  --color-white:  #FFFFFF;
  --color-cream:  #DCC9A9;
  --color-rust:   #B83A2D;
  --color-moss:   #4E6851;

  --font-pixel: 'VonwaonBitmap', 'BaDingShiWeiTi', 'SimSun', monospace;

  --font-size-caption: 12px;
  --font-size-base:    16px;
  --font-size-md:      32px;
  --font-size-lg:      64px;

  --border-width:  4px;
  --shadow-offset: 4px;

  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  32px;
  --space-xl:  64px;
  --space-2xl: 96px;

  --max-width: 960px;
  --frame-padding: 24px;
}

/* -----------------------------------------------------------
   2. @font-face — 凤凰点阵体 + 八丁饰尾体
   ----------------------------------------------------------- */
@font-face {
  font-family: 'VonwaonBitmap';
  src: url('../assets/fonts/VonwaonBitmap-16px.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'BaDingShiWeiTi';
  src: url('../assets/fonts/BaDingShiWeiTi-16.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* -----------------------------------------------------------
   3. Reset & Base
   ----------------------------------------------------------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-pixel);
  background-color: var(--color-black);
  color: var(--color-cream);

  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: unset;
  image-rendering: pixelated;
  image-rendering: crisp-edges;

  line-height: 1.5;
  min-height: 100vh;
}

/* 扫描线叠加 — CRT 效果：米白色细横线 */
.scanlines-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(220, 201, 169, 0.06) 2px,
    rgba(220, 201, 169, 0.06) 4px
  );
}

a {
  color: var(--color-cream);
  text-decoration: none;
  border-bottom: 2px dotted var(--color-cream);
  transition: border-width 0.1s, border-color 0.15s, color 0.15s;
}

a:hover {
  border-bottom-style: solid;
  border-bottom-width: 4px;
  border-bottom-color: var(--color-rust);
  color: var(--color-rust);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* -----------------------------------------------------------
   4. 复古终端外框
   ----------------------------------------------------------- */
.terminal-frame {
  position: relative;
  max-width: var(--max-width);
  margin: var(--space-lg) auto;
  padding: var(--frame-padding);
  border: 4px solid var(--color-cream);
  box-shadow:
    inset 0 0 0 4px var(--color-black),
    inset 0 0 0 6px var(--color-cream);
}

/* 四角装饰块 */
.corner-tl,
.corner-tr,
.corner-bl,
.corner-br {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--color-cream);
  z-index: 2;
}

.corner-tl { top: -4px; left: -4px; }
.corner-tr { top: -4px; right: -4px; }
.corner-bl { bottom: -4px; left: -4px; }
.corner-br { bottom: -4px; right: -4px; }

/* 内边框装饰 */
.frame-inner-border {
  position: absolute;
  inset: 8px;
  border: 2px solid var(--color-cream);
  pointer-events: none;
  z-index: 1;
}

/* -----------------------------------------------------------
   5. 雷达图标（右上角）
   ----------------------------------------------------------- */
.radar-icon {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  z-index: 3;
}

.radar-ring {
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-cream);
  border-radius: 0;
  clip-path: polygon(
    0 0, 100% 0, 100% 100%, 0 100%
  );
}

.radar-ring::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 2px solid var(--color-cream);
}

.radar-ring::after {
  content: '';
  position: absolute;
  inset: 10px;
  background: var(--color-cream);
}

.radar-sweep {
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 50%;
  background: var(--color-rust);
  transform-origin: bottom center;
  animation: radar-spin 3s linear infinite;
}

@keyframes radar-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* -----------------------------------------------------------
   6. Header — 标题区
   ----------------------------------------------------------- */
.site-header {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-lg);
  text-align: center;
}

.site-title {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

/* 主标题「鼹鼠窝」64px */
.title-main {
  font-family: var(--font-pixel);
  font-size: var(--font-size-lg);
  font-weight: normal;
  line-height: 1.1;
  letter-spacing: 0.08em;
  color: var(--color-cream);
}

/* 分隔符 */
.title-sep {
  font-family: var(--font-pixel);
  font-size: var(--font-size-md);
  color: var(--color-cream);
  opacity: 0.6;
}

/* 副标题 */
.title-sub {
  font-family: var(--font-pixel);
  font-size: var(--font-size-md);
  font-weight: normal;
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--color-cream);
}

/* 像素装饰线 */
.pixel-rule {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  height: 4px;
}

.pixel-rule span {
  display: block;
  width: 8px;
  height: 4px;
  background: var(--color-cream);
}

.pixel-rule span.rust {
  background: var(--color-rust);
  width: 16px;
}

.pixel-rule span.moss {
  background: var(--color-moss);
  width: 16px;
}

/* -----------------------------------------------------------
   7. Projects — 项目展示区
   ----------------------------------------------------------- */
.site-main {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-xl);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* 像素边框卡片 */
.project-card {
  background: var(--color-black);
  border: 4px solid var(--color-cream);
  padding: var(--space-md);
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* 不同主题色卡片 */
.project-card[data-theme="rust"] {
  border-color: var(--color-rust);
}
.project-card[data-theme="rust"] .project-title {
  color: var(--color-rust);
}

.project-card[data-theme="moss"] {
  border-color: var(--color-moss);
}
.project-card[data-theme="moss"] .project-title {
  color: var(--color-moss);
}

.project-card[data-theme="cream"] {
  border-color: var(--color-cream);
}
.project-card[data-theme="cream"] .project-title {
  color: var(--color-cream);
}

.project-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--color-cream);
}

.project-card[data-theme="rust"]:hover {
  box-shadow: 6px 6px 0 0 var(--color-rust);
}
.project-card[data-theme="moss"]:hover {
  box-shadow: 6px 6px 0 0 var(--color-moss);
}
.project-card[data-theme="cream"]:hover {
  box-shadow: 6px 6px 0 0 var(--color-cream);
}

/* 项目标题 */
.project-title {
  font-family: var(--font-pixel);
  font-size: var(--font-size-base);
  font-weight: normal;
  text-align: center;
  padding-bottom: var(--space-md);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* 图片框 16:9 */
.project-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 2px solid currentColor;
  background-color: var(--color-black);
  position: relative;
}

.project-card[data-theme="rust"] .project-image {
  border-color: var(--color-rust);
}
.project-card[data-theme="moss"] .project-image {
  border-color: var(--color-moss);
}
.project-card[data-theme="cream"] .project-image {
  border-color: var(--color-cream);
}

/* 半色调纹理（halftone） */
.project-image::before,
.placeholder-halftone::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, var(--color-cream) 1px, transparent 1px);
  background-size: 6px 6px;
  background-position: 0 0, 3px 3px;
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
}

.project-image img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(1.2);
}

/* 纯占位半色调 */
.placeholder-halftone {
  aspect-ratio: 16 / 9;
  border: 2px solid var(--color-cream);
  background: var(--color-black);
  position: relative;
  overflow: hidden;
}

.placeholder-halftone::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, var(--color-cream) 1.5px, transparent 1.5px);
  background-size: 8px 8px;
  opacity: 0.4;
  z-index: 0;
}

/* -----------------------------------------------------------
   8. Footer — 底部信息区
   ----------------------------------------------------------- */
.site-footer {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-md);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  border-top: 2px solid var(--color-cream);
  border-bottom: 2px solid var(--color-cream);
  margin-bottom: var(--space-md);
}

.copyright {
  font-family: var(--font-pixel);
  font-size: var(--font-size-base);
  letter-spacing: 0.1em;
  color: var(--color-cream);
}

/* 像素图标组 */
.pixel-icons {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.pixel-icon {
  display: inline-flex;
  width: 20px;
  height: 20px;
  color: var(--color-cream);
  cursor: pointer;
  transition: color 0.15s, transform 0.15s;
}

.pixel-icon:hover {
  color: var(--color-rust);
  transform: scale(1.2);
}

.pixel-icon svg {
  width: 100%;
  height: 100%;
}

/* 闪烁光标 */
.cursor-blink {
  font-size: var(--font-size-base);
  color: var(--color-cream);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* 备案号 */
.beian {
  font-family: var(--font-pixel);
  font-size: var(--font-size-caption);
  line-height: 1.4;
  text-align: center;
}

.beian a {
  border-bottom: 1px dotted var(--color-cream);
}

.beian a:hover {
  border-bottom: 2px solid var(--color-rust);
  color: var(--color-rust);
}

/* -----------------------------------------------------------
   9. 响应式
   ----------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --font-size-lg: 48px;
    --font-size-md: 24px;
    --frame-padding: 16px;
  }

  .terminal-frame {
    margin: var(--space-sm);
  }

  .project-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .site-header {
    padding-top: var(--space-lg);
  }

  .site-title {
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
  }

  .title-sep {
    display: none;
  }

  .radar-icon {
    display: none;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-lg: 36px;
    --font-size-md: 20px;
  }

  .project-card {
    --border-width: 3px;
    --shadow-offset: 3px;
  }

  .pixel-rule span {
    width: 6px;
  }
}

/* -----------------------------------------------------------
   10. 打印样式
   ----------------------------------------------------------- */
@media print {
  .scanlines-overlay,
  .radar-sweep,
  .cursor-blink {
    display: none;
  }

  body {
    background-color: #fff;
    color: #000;
  }
}