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

:root {
    --bg-gradient-start: #f0f2f5;
    --bg-gradient-end: #e5e8ed;
    --card-bg: rgba(255, 255, 255, 0.85);
    --key-base: #ffffff;
    --key-gradient: linear-gradient(145deg, #fafafc, #f2f4f8);
    --key-shadow: 0 4px 0 #b5b9c2, 0 2px 8px rgba(0,0,0,0.1);
    --key-active: #34c759;
    --key-active-shadow: 0 2px 0 #1f8f3a, 0 4px 12px rgba(52,199,89,0.3);
    --text-primary: #1d1d1f;
    --text-secondary: #5e5e6b;
    --log-bg: #1c1c28e0;
    --log-border: rgba(255,255,255,0.1);
    --accent-blue: #0071e3;
    --accent-blue-dark: #005bbf;
    --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
    --border-radius-md: 14px;
    --border-radius-lg: 24px;
    --backdrop-blur: blur(16px);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Roboto, 'Microsoft YaHei', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    overflow-x: hidden;
    user-select: none;
    line-height: 1.6;
}

.tester-container {
    width: 1180px;
    max-width: 100%;
    background: var(--card-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-radius: 42px;
    padding: 32px 32px 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255,255,255,0.5) inset;
    border: 1px solid rgba(255,255,255,0.7);
}

/* 头部区域 — 玻璃质感 */
header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 16px 24px;
    background: rgba(255,255,255,0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 60px;
    padding: 10px 22px 10px 28px;
    border: 1px solid rgba(255,255,255,0.8);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    background: linear-gradient(130deg, #1f2937, #2d3b4b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(255,255,255,0.5);
}

.status-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    align-items: center;
}

.stat-item {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    padding: 8px 20px;
    border-radius: 40px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    border: 1px solid rgba(255,255,255,0.9);
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.concurrent-badge {
    background: #2d3b4b;
    color: white;
    padding: 8px 20px;
    border-radius: 40px;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 6px 0 #151e26, 0 4px 12px rgba(0,0,0,0.2);
    border-bottom: 2px solid #546e7a;
}

#reset-btn {
    padding: 10px 28px;
    border-radius: 50px;
    border: none;
    background: var(--accent-blue);
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border-bottom: 4px solid var(--accent-blue-dark);
    transition: all 0.12s ease;
    box-shadow: 0 4px 12px rgba(0,113,227,0.3);
    letter-spacing: 0.3px;
}
#reset-btn:hover {
    background: #0077ed;
    transform: scale(1.02);
}
#reset-btn:active {
    transform: translateY(4px);
    border-bottom-width: 1px;
}

/* 实时信息行 — 磨砂玻璃卡片 */
.info-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px 35px;
    background: rgba(255,255,255,0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 16px 28px;
    border-radius: 60px;
    margin-bottom: 28px;
    font-size: 1rem;
    border: 1px solid rgba(255,255,255,0.8);
    box-shadow: 0 8px 18px -8px rgba(0,0,0,0.1);
}

.key-detail {
    font-weight: 500;
    color: #2c3e4f;
}
.key-detail span {
    font-weight: 600;
    background: white;
    padding: 6px 20px;
    border-radius: 40px;
    margin-left: 10px;
    border: 1px solid #d4dae2;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.02);
    color: #1d1d1f;
}

/* 键盘主体 — 模拟铝合金底座 */
.keyboard-iso {
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: linear-gradient(160deg, #d8dde5, #c2c8d2);
    padding: 22px 20px;
    border-radius: 28px;
    user-select: none;
    margin-bottom: 28px;
    box-shadow: 0 16px 0 #8f969f, 0 20px 30px -8px black;
    border-bottom: 2px solid #ffffff50;
}

.row {
    display: flex;
    gap: 8px;
    height: 58px;
}

/* 键帽基本样式 — 立体悬浮感 */
.key {
    background: var(--key-gradient);
    border-radius: 10px;
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.12s cubic-bezier(0.2, 0, 0, 1);
    border-bottom: 4px solid #a5aab3;
    box-shadow: 0 2px 0 #7e848e, 0 4px 10px rgba(0,0,0,0.15);
    position: relative;
    color: var(--text-primary);
    text-transform: lowercase;
    line-height: 1.2;
    backdrop-filter: blur(2px);
    border-left: 1px solid #ffffff70;
    border-right: 1px solid #ffffff30;
    border-top: 1px solid #ffffffc0;
}

/* 键帽内文字排版 */
.key span:only-child {
    font-size: 14px;
    font-weight: 600;
    text-transform: lowercase;
}
.key span:first-child:not(:only-child) {
    font-size: 10px;
    opacity: 0.75;
    margin-bottom: 2px;
    font-weight: 500;
    letter-spacing: 0.2px;
}
.key span:last-child:not(:only-child) {
    font-size: 16px;
    font-weight: 600;
    line-height: 1;
}

/* 特殊长键字体调整 */
.key.delete span:only-child,
.key.tab span:only-child,
.key.capslock span:only-child,
.key.shift-left span:only-child,
.key.shift-right span:only-child,
.key.fn span:only-child,
.key.control span:only-child,
.key.option span:only-child,
.key.command span:only-child,
.key.power span:only-child {
    font-size: 13px;
}

/* ================= 修改点 ================= */
/* 计数器标签 — 仅保留文字，移除椭圆背景 */
.down-count, .up-count {
    position: absolute;
    font-size: 15px;
    font-weight: 600;
    color: #fff;               
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    z-index: 20;
    pointer-events: none;
    line-height: 1.4;
    font-family: var(--font-mono);
    /* 移除背景、边框、圆角、内边距 */
    background: none;
    border: none;
    border-radius: 0;
    padding: 0;
}
.down-count {
    top: 2px;
    right: 2px;
    color: #4cd964;            /* 按下绿色 */
}
.up-count {
    bottom: 2px;
    right: 2px;
    color: #ff9f0a;            /* 松开橙色 */
}
/* ========================================== */

/* 键帽按下 / 激活状态 */
.key.active,
.key.active.tested {
    background: var(--key-active) !important;
    transform: translateY(6px);
    border-bottom: 1px solid #1f8f3a;
    box-shadow: 0 0 0 2px rgba(52,199,89,0.5), 0 8px 12px -6px #1f8f3a;
    color: white;
    transition: all 0.08s;
}
.key.active .down-count,
.key.active .up-count {
    /* 激活时计数器颜色可保持不变，或微调 */
    color: white;
    text-shadow: 0 1px 3px rgba(0,0,0,0.8);
}

/* 已测试过（灰色记忆） */
.key.tested {
    background: #e7eaf0;
    border-bottom: 3px solid #9fa6b2;
    color: #2c3e50;
}

/* 特殊键宽度比例 (与原版一致) */
.esc { flex: 1.5; }
.delete { flex: 1.8; }
.tab { flex: 1.5; }
.capslock { flex: 1.9; }
.shift-left { flex: 1.2; }
.shift-right { flex: 2.2; }
.space { flex: 5.5; }
.command { flex: 1.4; }
.power { flex: 1.2; }
.fn { flex: 1.2; }
.control { flex: 1.3; }
.option { flex: 1.3; }

/* 箭头组布局微调 */
.arrow-group {
    display: flex;
    gap: 6px;
    flex: 2.2;
}
.arrow-vertical {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}
.arrow-vertical .key {
    height: 27px;
    flex: 1 1 auto;
    font-size: 16px;
}
.arrow-group .key.arrow {
    font-size: 18px;
    font-weight: 600;
    background: var(--key-gradient);
}

/* 日志面板 — 深色玻璃终端 */
.log-panel {
    background: rgba(18, 20, 28, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 28px;
    padding: 20px 24px;
    color: #edf2f9;
    border: 1px solid rgba(255,255,255,0.15);
    box-shadow: 0 20px 30px -12px black, inset 0 1px 2px rgba(255,255,255,0.1);
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    font-weight: 500;
    letter-spacing: 0.3px;
    color: #b3bbd5;
    font-size: 0.95rem;
    padding: 0 4px;
}

#clear-log {
    background: #32384a;
    border: none;
    color: white;
    padding: 8px 24px;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 3px solid #1b1f2b;
    transition: 0.1s ease;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    backdrop-filter: blur(4px);
}
#clear-log:active {
    transform: translateY(4px);
    border-bottom-width: 1px;
}

.log-entries {
    background: #0b0d14e0;
    border-radius: 20px;
    padding: 16px 18px;
    height: 160px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
    display: flex;
    flex-direction: column;
    border: 1px solid #303548;
    box-shadow: inset 0 4px 12px #00000040;
}

.log-entry {
    border-bottom: 1px solid #293040;
    padding: 5px 0;
    color: #bac3e0;
}

.log-entry.warning {
    color: #ffbcaf;
    background: #4d2e2ecc;
    margin: 3px 0;
    padding: 6px 12px;
    border-radius: 40px;
    font-weight: 500;
    border-left: 4px solid #ff6b6b;
    backdrop-filter: blur(2px);
}

.timestamp {
    color: #7b89b3;
    margin-right: 14px;
    font-weight: 400;
}

/* 滚动条美化 */
.log-entries::-webkit-scrollbar {
    width: 6px;
}
.log-entries::-webkit-scrollbar-track {
    background: #1a1e2c;
    border-radius: 20px;
}
.log-entries::-webkit-scrollbar-thumb {
    background: #44506b;
    border-radius: 20px;
    border: 1px solid #2c3348;
}

/* 响应式 */
@media (max-width: 700px) {
    .tester-container { padding: 20px; }
    .row { height: 48px; }
}