/* ============================================================
   双人小游戏合集 —— 复古90年代设计系统（Win95 气质）
   系统灰基底 / 纯黑文字 / 海军蓝标题栏 / 3D 斜角控件 / 零圆角
   ============================================================ */

@font-face {
  font-family: 'ZCOOLKuHei';
  src: url('https://resource-static.bj.bcebos.com/fonts-skill/ZCOOLKuHei_Regular.ttf') format('truetype');
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: 'SourceHanSerifCN';
  src: url('https://resource-static.bj.bcebos.com/fonts-skill/SourceHanSerifCN-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}

:root {
  --bg: #C0C0C0;          /* Win95 灰基底 */
  --fg: #000000;
  --card: #FFFFFF;
  --navy: #000080;        /* 海军蓝：标题栏 / 主操作 */
  --titlebar-to: #1084D0;
  --link: #0000FF;        /* 早期网页超链接三态 */
  --visited: #800080;
  --hover: #FF0000;
  --neon-green: #00FF00;  /* 计数器绿字黑底 */
  --yellow: #FFFF00;
  --muted-fg: #4D4D4D;
  --font-head: 'ZCOOLKuHei', 'Microsoft YaHei', sans-serif;
  --font-body: 'SourceHanSerifCN', 'SimSun', '宋体', serif;
  --font-mono: 'Courier New', 'Courier', monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background-color: var(--bg);
  /* 灰色细斜纹底：粗糙、反极简的早期网页质感 */
  background-image: repeating-linear-gradient(
    45deg, transparent 0, transparent 2px,
    rgba(0, 0, 0, 0.04) 2px, rgba(0, 0, 0, 0.04) 4px
  );
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 400;
  margin: 0;
}
p { margin: 0; }
a { color: var(--link); text-decoration: underline; }
a:visited { color: var(--visited); }
a:hover { color: var(--hover); }

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 12px 48px;
}

/* ---------- Win95 控件 ---------- */

.win {
  background: var(--bg);
  border: 2px solid;
  border-color: #FFFFFF #000000 #000000 #FFFFFF;
  box-shadow: inset 1px 1px 0 #DFDFDF, inset -1px -1px 0 #808080,
              2px 2px 0 #808080, 1px 1px 0 #000000;
}

.titlebar {
  background: linear-gradient(90deg, var(--navy), var(--titlebar-to));
  color: #FFFFFF;
  font-family: var(--font-head);
  font-weight: bold;
  font-size: 15px;
  padding: 5px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.win-body { padding: 14px; }

.btn {
  font-family: var(--font-head);
  font-weight: bold;
  font-size: 14px;
  line-height: 1.4;
  padding: 7px 16px;
  cursor: pointer;
  user-select: none;
  background: var(--bg);
  color: var(--fg);
  border: 2px solid;
  border-color: #FFFFFF #000000 #000000 #FFFFFF;
  box-shadow: inset 1px 1px 0 #DFDFDF, inset -1px -1px 0 #808080;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
.btn:active {
  border-color: #000000 #FFFFFF #FFFFFF #000000;
  box-shadow: inset 1px 1px 0 #808080, inset -1px -1px 0 #DFDFDF;
  transform: translate(1px, 1px);
}
.btn:disabled {
  color: #808080;
  text-shadow: 1px 1px 0 #FFFFFF;
  cursor: not-allowed;
}
.btn-primary {
  background: var(--navy);
  color: #FFFFFF;
  border-color: #7B9CD9 #000030 #000030 #7B9CD9;
}
.btn-primary:active {
  border-color: #000030 #7B9CD9 #7B9CD9 #000030;
}

.divider {
  border-top: 1px solid #808080;
  border-bottom: 1px solid #FFFFFF;
  height: 2px;
  margin: 10px 0;
}

.stripe {
  height: 14px;
  margin: 16px 0;
  /* 黄黑施工条纹：90年代“建设中”能量 */
  background: repeating-linear-gradient(
    45deg, var(--yellow) 0 10px, #000000 10px 20px
  );
}

/* ---------- 导航 ---------- */

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 10px;
}
.site-nav a {
  font-family: var(--font-head);
  font-size: 15px;
  padding: 4px 12px;
  color: var(--fg);
  text-decoration: none;
}
.site-nav a:hover { color: var(--hover); text-decoration: underline; }
.site-nav a.active {
  background: #000000;
  color: var(--neon-green);
  text-decoration: none;
}

/* ---------- 跑马灯 / 彩虹 / 闪烁 ---------- */

.marquee {
  overflow: hidden;
  white-space: nowrap;
  padding: 5px 0;
  background: #000000;
  color: var(--neon-green);
  font-family: var(--font-mono);
  font-size: 14px;
  margin-top: 12px;
}
.marquee span {
  display: inline-block;
  animation: marquee 22s linear infinite;
}
@keyframes marquee {
  from { transform: translateX(100%); }
  to   { transform: translateX(-100%); }
}

.rainbow {
  background: linear-gradient(90deg,
    #FF0000, #FF7F00, #FFFF00, #00FF00, #0000FF, #8B00FF);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent; /* 降级 */
  animation: rainbow-cycle 3s linear infinite;
}
@keyframes rainbow-cycle {
  to { background-position: 200% 50%; }
}

.blink { animation: blink-anim 1s steps(2) infinite; }
@keyframes blink-anim { 50% { opacity: 0; } }

/* ---------- 计数器数位 ---------- */

.digit {
  display: inline-block;
  background: #000000;
  color: var(--neon-green);
  font-family: var(--font-mono);
  font-weight: bold;
  padding: 1px 6px;
  border: 1px solid var(--neon-green);
  min-width: 1.4ch;
  text-align: center;
}

/* ---------- 首页 ---------- */

.hero { margin-top: 16px; }
.hero-title {
  font-size: 26px;
  text-align: center;
  margin: 6px 0 10px;
}
@media (min-width: 720px) { .hero-title { font-size: 34px; } }
.hero-desc {
  text-align: center;
  color: var(--muted-fg);
  max-width: 40em;
  margin: 0 auto;
}

.game-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 720px) { .game-grid { grid-template-columns: 1fr 1fr; } }

.game-card { display: flex; flex-direction: column; }
.game-card .win-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.game-card h2 { font-size: 20px; }
.game-card .btn { margin-top: auto; }
.key-line { font-family: var(--font-mono); font-size: 13px; color: var(--muted-fg); }
.badge-new {
  background: var(--yellow);
  color: #000000;
  font-size: 12px;
  padding: 1px 6px;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

/* ---------- 游戏页通用 ---------- */

.game-shell { margin-top: 16px; }
.status-line {
  text-align: center;
  font-family: var(--font-mono);
  font-weight: bold;
  color: var(--navy);
  margin: 10px 0;
}
.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.key-guide {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
@media (min-width: 720px) { .key-guide { grid-template-columns: 1fr 1fr; } }
.key-guide h3 { font-size: 15px; margin-bottom: 4px; }
.key-guide .key-box {
  background: var(--card);
  padding: 8px 10px;
  border: 2px solid;
  border-color: #000000 #FFFFFF #FFFFFF #000000;
}
.key {
  display: inline-block;
  min-width: 2.2em;
  text-align: center;
  padding: 2px 8px;
  background: var(--bg);
  border: 2px solid;
  border-color: #FFFFFF #000000 #000000 #FFFFFF;
  box-shadow: inset 1px 1px 0 #DFDFDF, inset -1px -1px 0 #808080;
  font-family: var(--font-mono);
  font-weight: bold;
  font-size: 14px;
}
.tip {
  text-align: center;
  font-size: 13px;
  color: var(--muted-fg);
}

/* ---------- 乒乓球 ---------- */

.scoreboard {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  font-family: var(--font-head);
  font-size: 17px;
}
.score-side { display: flex; align-items: center; gap: 8px; }
.score-colon { font-family: var(--font-mono); font-size: 24px; font-weight: bold; }

.screen-wrap {
  background: #000000;
  border: 2px solid;
  border-color: #000000 #FFFFFF #FFFFFF #000000;
  box-shadow: inset 1px 1px 0 #808080;
}
#pong-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: #000000;
}

/* ---------- 井字棋 ---------- */

.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, min(96px, 27vw));
  grid-template-rows: repeat(3, min(96px, 27vw));
  gap: 8px;
  width: max-content;
  margin: 0 auto;
}
.ttt-cell {
  font-family: var(--font-head);
  font-size: 44px;
  line-height: 1;
  color: var(--muted-fg);
  background: var(--card);
  cursor: pointer;
  padding: 0;
}
.ttt-cell.x { color: var(--navy); }
.ttt-cell.o { color: var(--hover); }
.ttt-cell.win { background: var(--yellow); }
.ttt-stats {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  font-family: var(--font-head);
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--muted-fg);
}

/* ---------- 无障碍：减少动态 ---------- */

@media (prefers-reduced-motion: reduce) {
  .marquee span, .rainbow, .blink { animation: none !important; }
}