/* ============================================================
   Keyboard Test Styles（键盘测试 - 立体透明机械键帽）
   风格与首页保持一致：白底、品牌蓝 #2D9CDB、圆角卡片
   ============================================================ */

.kb-page {
  /* 突破 post 布局 720px 窄容器：相对视口居中，给 108 键足够宽度
     键盘内容需求约 1200px（22u×50 + 分区间隔 + padding），取 1240px 留余量 */
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: min(1240px, calc(100vw - 64px));
  padding: 8px 0 40px;
}

/* ===== 顶部统计栏 ===== */
.kb-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  align-items: center;
  margin-bottom: 22px;
}

.kb-stat-card {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 20px;
  background: #fff;
  border: 1px solid #e6e9ed;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  font-size: 14px;
  color: #6a7684;
}

.kb-stat-card strong {
  font-size: 22px;
  font-weight: 700;
  color: #2c3e50;
  font-variant-numeric: tabular-nums;
}

.kb-stat-card.is-active strong {
  color: #2D9CDB;
}

/* 当前按下键名：等宽字体 + 限制宽度（多键同按时优雅截断） */
.kb-stat-card strong#kb-stat-active {
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 18px;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== 键盘底座 ===== */
.kb-deck {
  background: linear-gradient(180deg, #f3faff 0%, #ffffff 100%);
  border: 1px solid #e6e9ed;
  border-radius: 16px;
  padding: 26px 22px 30px;
  box-shadow: 0 12px 32px rgba(45, 156, 219, 0.08);
  /* 紧贴键盘内容宽度并水平居中，保证左右边框对称；
     窄屏时收缩为容器宽度并内部横向滚动 */
  width: max-content;
  max-width: 100%;
  margin: 0 auto;
  overflow-x: auto;
}

/* 键盘内框（金属托盘质感） */
.kb-tray {
  background: linear-gradient(180deg, #eef3f8 0%, #e2eaf2 100%);
  border: 1px solid #d5dee8;
  border-radius: 12px;
  padding: 16px 14px;
  box-shadow:
    inset 0 2px 6px rgba(120, 140, 160, 0.25),
    inset 0 -1px 2px rgba(255, 255, 255, 0.8);
}

/* ===== 行布局 ===== */
.kb-tray {
  /* 1u = 一个标准键宽（含间隙），行内 gap 已由键宽公式扣除 */
  --u-size: 50px;
  /* 始终按键盘内容自适应宽度，避免被外层容器压缩导致溢出边框 */
  width: max-content;
}

.kb-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.kb-row:last-child {
  margin-bottom: 0;
}

/* 分区间隔 */
.kb-gap {
  flex: 0 0 14px;
}

/* 1u 宽空占位（编辑区无键的行，保证小键盘列对齐） */
.kb-blank {
  flex: 0 0 calc(1 * var(--u-size) - 6px);
  width: calc(1 * var(--u-size) - 6px);
  height: 46px;
}

/* ============================================================
   立体透明机械键帽
   - 顶面：半透明白色渐变 + 顶部内高光（玻璃/树脂质感）
   - 侧壁：多层 box-shadow 形成厚度
   - 按下：下沉 + 侧壁压缩 + 品牌蓝发光
   ============================================================ */
.kb-key {
  --u: 4;                    /* 宽度单位（由 JS 设置） */
  --wall: #c3d2de;           /* 侧壁颜色 */
  --wall-dark: #9fb4c4;      /* 侧壁暗部 */
  position: relative;
  flex: 0 0 calc(var(--u) * var(--u-size) - 6px);
  width: calc(var(--u) * var(--u-size) - 6px);
  height: 46px;
  border: 1px solid rgba(45, 156, 219, 0.22);
  border-radius: 8px;
  box-sizing: border-box;
  cursor: default;
  user-select: none;
  -webkit-user-select: none;

  /* 透明键帽顶面：半透明白 + 玻璃高光 */
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.92) 0%,
      rgba(243, 250, 255, 0.78) 45%,
      rgba(228, 240, 250, 0.68) 100%
    );
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);

  /* 立体侧壁：厚度 5px + 底部投影 */
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.95),
    inset 0 -2px 3px rgba(140, 165, 190, 0.18),
    0 5px 0 -1px var(--wall),
    0 6px 0 -1px var(--wall-dark),
    0 9px 14px rgba(30, 60, 90, 0.18);

  transition:
    transform 0.07s cubic-bezier(0.3, 0.9, 0.4, 1),
    box-shadow 0.07s cubic-bezier(0.3, 0.9, 0.4, 1),
    background 0.18s ease,
    border-color 0.18s ease;

  /* 键帽字符 */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.15;
  color: #2c3e50;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.kb-key .kb-sub {
  font-size: 9px;
  font-weight: 500;
  color: #6a7684;
  margin-top: 1px;
}

/* 小键（F 区等）字号略小 */
.kb-key.kb-small {
  font-size: 10px;
}

/* 竖向 2u 高键（小键盘 + / Enter）：占两行，负 margin 让下一行上移 */
.kb-key.kb-tall {
  height: 98px;
  margin-bottom: -52px;
  z-index: 2;
}

/* ===== 悬停（鼠标模拟按压前的轻浮起） ===== */
.kb-key:hover {
  border-color: rgba(45, 156, 219, 0.45);
}

/* ===== 按下状态：立体下沉 ===== */
.kb-key.pressed {
  transform: translateY(5px);

  /* 按下瞬间立即变色（覆盖默认 0.18s 渐变，避免看到过渡中的旧颜色） */
  transition:
    transform 0.07s cubic-bezier(0.3, 0.9, 0.4, 1),
    box-shadow 0.07s cubic-bezier(0.3, 0.9, 0.4, 1),
    background 0.04s linear,
    border-color 0.04s linear;

  /* 侧壁压缩：厚度从 5px 变 1px，投影收紧 */
  box-shadow:
    inset 0 2px 5px rgba(45, 156, 219, 0.28),
    inset 0 -1px 2px rgba(45, 156, 219, 0.2),
    0 1px 0 -1px var(--wall-dark),
    0 2px 5px rgba(30, 60, 90, 0.22);

  /* 顶面被点亮：品牌蓝半透明发光 */
  background:
    linear-gradient(
      180deg,
      rgba(45, 156, 219, 0.4) 0%,
      rgba(45, 156, 219, 0.55) 55%,
      rgba(45, 140, 204, 0.62) 100%
    );

  border-color: rgba(45, 156, 219, 0.75);
  color: #ffffff;
}

.kb-key.pressed .kb-sub {
  color: rgba(255, 255, 255, 0.85);
}

/* 按下时的外发光（RGB 氛围感） */
.kb-key.pressed::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 11px;
  background: radial-gradient(
    ellipse at center,
    rgba(45, 156, 219, 0.35) 0%,
    rgba(45, 156, 219, 0.12) 55%,
    transparent 75%
  );
  z-index: -1;
  pointer-events: none;
}

/* ===== 已按过的键（测试通过：更深的蓝色印记，与未按过的键帽明显区分） ===== */
.kb-key.touched {
  border-color: rgba(21, 101, 160, 0.85);
  background:
    linear-gradient(
      180deg,
      rgba(45, 130, 190, 0.55) 0%,
      rgba(20, 90, 150, 0.72) 100%
    );
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    inset 0 -2px 3px rgba(10, 50, 90, 0.3),
    0 5px 0 -1px #6b96ba,
    0 6px 0 -1px #5a83a6,
    0 9px 14px rgba(30, 60, 90, 0.22);
  color: #ffffff;
}

.kb-key.touched .kb-sub {
  color: rgba(255, 255, 255, 0.8);
}

/* ===== 按键记录区 ===== */
.kb-history {
  margin-top: 22px;
  background: #fff;
  border: 1px solid #e6e9ed;
  border-radius: 12px;
  padding: 18px 22px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.kb-history h3 {
  margin: 0 0 12px;
  font-size: 16px;
  color: #2c3e50;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kb-reset-btn {
  border: 1px solid #e6e9ed;
  background: #fff;
  color: #6a7684;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.kb-reset-btn:hover {
  border-color: #2D9CDB;
  color: #2D9CDB;
  transform: translateY(-1px);
}

.kb-history-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 34px;
  align-items: center;
}

.kb-history-list .kb-hint {
  color: #a0a7b0;
  font-size: 13px;
}

.kb-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(45, 156, 219, 0.1);
  border: 1px solid rgba(45, 156, 219, 0.3);
  color: #2D8BCC;
  font-size: 13px;
  font-weight: 600;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  animation: kb-chip-in 0.25s cubic-bezier(0.3, 1.2, 0.4, 1);
}

.kb-chip .kb-chip-count {
  font-size: 11px;
  color: #6a7684;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 999px;
  padding: 0 6px;
}

@keyframes kb-chip-in {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.85);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ===== 使用说明 ===== */
.kb-usage {
  margin-top: 22px;
  padding: 16px 20px;
  border-left: 3px solid #2D9CDB;
  background: #f8f9fa;
  border-radius: 0 10px 10px 0;
  color: #6a7684;
  font-size: 14px;
  line-height: 1.8;
}

.kb-usage strong {
  color: #2c3e50;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1300px) {
  .kb-deck {
    /* 窄屏时已由默认样式保证：max-width 100% + 横向滚动 */
  }
}

@media (max-width: 768px) {
  .kb-stat-card {
    padding: 8px 14px;
    font-size: 13px;
  }

  .kb-stat-card strong {
    font-size: 18px;
  }
}