/* ==========================================
   移动端虚拟键盘样式 - 响应式设计
   ========================================== */

/* CSS变量 - 支持动态调整 */
:root {
    --vk-key-width: 40px;
    --vk-key-gap: 6px;
    --vk-key-padding: 12px;
    --vk-font-size: 16px;
    --vk-max-height: 50vh;
}

.virtual-keyboard {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: rgba(0, 0, 51, 0.95);
    backdrop-filter: blur(10px);
    border-top: 2px solid rgba(255, 215, 0, 0.3);
    transform: translateY(100%);
    transition: transform 0.3s ease-in-out;
    max-height: var(--vk-max-height);
    overflow: hidden;
    box-sizing: border-box;
}

.virtual-keyboard.keyboard-visible {
    transform: translateY(0);
}

.virtual-keyboard-container {
    padding: 15px 10px 5px;
    max-width: 100%;
    margin: 0 auto;
    box-sizing: border-box;
}

.virtual-keyboard-keys {
    display: flex;
    flex-direction: column;
    gap: var(--vk-key-gap);
    align-items: center;
}

.virtual-keyboard-row {
    display: flex;
    justify-content: center;
    gap: var(--vk-key-gap);
    flex-wrap: nowrap;
    width: 100%;
    max-width: 100%;
}

.virtual-keyboard-row.control-row {
    margin-top: 10px;
    justify-content: center;
}

.virtual-key {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: 8px;
    color: white;
    font-size: var(--vk-font-size);
    font-weight: bold;
    padding: var(--vk-key-padding);
    min-width: var(--vk-key-width);
    width: var(--vk-key-width);
    min-height: calc(var(--vk-key-width) * 1.25); /* 增加高度从1.1倍变为1.25倍 */
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    flex-shrink: 0;
}

.virtual-key:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: rgba(255, 215, 0, 0.6);
    transform: translateY(-1px);
}

.virtual-key:active,
.virtual-key.key-pressed {
    background: rgba(255, 215, 0, 0.4);
    border-color: rgba(255, 215, 0, 0.8);
    transform: translateY(1px);
}

.virtual-key.letter-key {
    /* 字母按键使用统一尺寸 */
}

.virtual-key.special-key {
    background: rgba(255, 100, 100, 0.2);
    border-color: rgba(255, 100, 100, 0.4);
    min-width: calc(var(--vk-key-width) * 1.5);
    width: calc(var(--vk-key-width) * 1.5);
}

.virtual-key.special-key:hover {
    background: rgba(255, 100, 100, 0.3);
    border-color: rgba(255, 100, 100, 0.6);
}

.virtual-key.enter-key {
    background: rgba(0, 255, 0, 0.2);
    border-color: rgba(0, 255, 0, 0.4);
    min-width: calc(var(--vk-key-width) * 1.5);
    width: calc(var(--vk-key-width) * 1.5);
}

.virtual-key.enter-key:hover {
    background: rgba(0, 255, 0, 0.3);
    border-color: rgba(0, 255, 0, 0.6);
}

.virtual-key.backspace-key {
    min-width: calc(var(--vk-key-width) * 1.5);
    width: calc(var(--vk-key-width) * 1.5);
}

.virtual-key.clear-key {
    min-width: calc(var(--vk-key-width) * 2);
    width: calc(var(--vk-key-width) * 2);
    font-size: calc(var(--vk-font-size) * 0.9);
}

/* 不同屏幕尺寸的精细调整 */

/* 超小屏幕设备 (< 320px) */
@media screen and (max-width: 320px) {
    :root {
        --vk-key-width: 26px;
        --vk-key-gap: 3px;
        --vk-key-padding: 8px;
        --vk-font-size: 13px;
    }
    
    .virtual-keyboard-container {
        padding: 10px 5px 3px;
    }
}

/* 小屏幕设备 (320px - 480px) */
@media screen and (min-width: 321px) and (max-width: 480px) {
    :root {
        --vk-key-width: 32px;
        --vk-key-gap: 4px;
        --vk-key-padding: 10px;
        --vk-font-size: 14px;
    }
}

/* 中等屏幕设备 (481px - 768px) */
@media screen and (min-width: 481px) and (max-width: 768px) {
    :root {
        --vk-key-width: 42px;
        --vk-key-gap: 6px;
        --vk-key-padding: 12px;
        --vk-font-size: 16px;
    }
}

/* 平板设备 (769px - 1024px) */
@media screen and (min-width: 769px) and (max-width: 1024px) {
    :root {
        --vk-key-width: 50px;
        --vk-key-gap: 8px;
        --vk-key-padding: 14px;
        --vk-font-size: 18px;
    }
    
    .virtual-keyboard-container {
        padding: 20px 15px 8px;
    }
}

/* 横屏模式优化 */
.virtual-keyboard.landscape-mode {
    max-height: 45vh;
}

.virtual-keyboard.landscape-mode .virtual-keyboard-container {
    padding: 10px 8px 3px;
}

.virtual-keyboard.landscape-mode .virtual-keyboard-keys {
    gap: calc(var(--vk-key-gap) * 0.8);
}

.virtual-keyboard.landscape-mode .virtual-keyboard-row {
    gap: calc(var(--vk-key-gap) * 0.8);
}

/* 横屏且低高度的特殊情况 */
@media screen and (max-height: 400px) and (orientation: landscape) {
    :root {
        --vk-max-height: 35vh;
        --vk-key-padding: 6px;
        --vk-font-size: 12px;
    }
    
    .virtual-keyboard-container {
        padding: 8px 5px 2px;
    }
    
    .virtual-keyboard.landscape-mode {
        max-height: var(--vk-max-height);
    }
}

/* 虚拟键盘动画效果 */
@keyframes keyPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.virtual-key.key-pressed {
    animation: keyPulse 0.15s ease-in-out;
}

/* 防止在移动端出现选择和放大镜效果 */
@media screen and (max-width: 1024px) {
    .virtual-keyboard * {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }
}