/* ========================================
   FreeCell Solitär - 移动端响应式适配
   8列布局 + 顶部8个单元格优化
   基于双重约束动态计算法
   ======================================== */

/* FreeCell响应式CSS变量 - 移动端优先 */
:root {
    /* 动态计算可用高度 */
    --freecell-header-height: var(--header-height, 48px);
    --freecell-available-height: calc(100vh - var(--freecell-header-height));
    
    /* FreeCell 8列布局间距 */
    --freecell-spacing: 0.6vw;
    
    /* 计算纸牌尺寸 - 基于宽度和高度的双重约束 */
    /* 宽度约束：8列 + 间距 */
    --freecell-card-width-by-width: calc((100vw - 3vw - 7 * var(--freecell-spacing)) / 8);
    
    /* 高度约束：顶部1排 + tableau约7张卡牌重叠(22%露出) + 边距 */
    /* 高度系数 = 1(顶部) + 1 + 6*0.22 = 3.32 ≈ 3.4 */
    --freecell-card-width-by-height: calc((var(--freecell-available-height) - 10vh) / 3.4);
    
    /* 选择较小值确保完全适配 */
    --freecell-card-width: min(
        var(--freecell-card-width-by-width),
        var(--freecell-card-width-by-height)
    );
    --freecell-card-height: calc(var(--freecell-card-width) * 1.4);
    --freecell-card-border-radius: calc(var(--freecell-card-width) * 0.08);
    
    /* 最小和最大尺寸控制 */
    --freecell-min-card-width: 48px;
    --freecell-min-card-height: 67px;
    --freecell-max-card-width: 160px;
    --freecell-max-card-height: 224px;
    
    /* 使用clamp确保卡片在合理范围内 */
    --card-width: clamp(
        var(--freecell-min-card-width),
        var(--freecell-card-width),
        var(--freecell-max-card-width)
    );
    --card-height: clamp(
        var(--freecell-min-card-height),
        var(--freecell-card-height),
        var(--freecell-max-card-height)
    );
}

/* ========================================
   FreeCell游戏容器 - Bootstrap Flexbox
   ======================================== */
.freecell-container {
    max-width: 100%;
    min-height: var(--freecell-available-height);
    height: auto;
    margin: 0 auto;
    padding: 1vh 0.5vw 3vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    box-sizing: border-box;
    position: relative;
}

/* ========================================
   顶部区域：Free Cells + Foundations
   ======================================== */
.freecell-top-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: calc(8 * var(--card-width) + 7 * var(--freecell-spacing));
    margin-bottom: 2vh;
    flex-shrink: 0;
    gap: 1vw;
}

.freecell-cells,
.freecell-foundations {
    display: flex;
    gap: var(--freecell-spacing);
    flex-shrink: 0;
}

.freecell-cell,
.foundation-pile {
    width: var(--card-width);
    height: var(--card-height);
    border-radius: var(--freecell-card-border-radius);
    border: 2px dashed rgba(255, 255, 255, 0.4);
    background: rgba(0, 0, 0, 0.1);
    position: relative;
    transition: all 0.2s ease;
}

.freecell-cell:hover,
.foundation-pile:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(0, 0, 0, 0.15);
}

/* ========================================
   Tableau区域 - 8列
   ======================================== */
.freecell-tableau {
    display: flex;
    gap: var(--freecell-spacing);
    justify-content: center;
    align-items: flex-start;
    flex: 1 1 auto;
    width: 100%;
    max-width: calc(8 * var(--card-width) + 7 * var(--freecell-spacing));
    min-height: 0;
}

.freecell-cascade {
    flex: 0 0 auto;
    width: var(--card-width);
    position: relative;
    min-height: calc(var(--card-height) * 1.5);
}

/* 空列样式 */
.freecell-cascade:empty::after {
    content: '';
    display: block;
    width: 100%;
    height: var(--card-height);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: var(--freecell-card-border-radius);
    background: rgba(0, 0, 0, 0.05);
}

.freecell-cascade.drop-target::after {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    border-style: solid;
}

.freecell-cell.drop-target,
.foundation-pile.drop-target {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    border-style: solid;
}

/* 卡牌样式 */
.freecell-cascade .card,
.freecell-cell .card,
.foundation-pile .card,
.fc-card {
    width: var(--card-width);
    height: var(--card-height);
    border-radius: var(--freecell-card-border-radius);
    position: absolute;
    top: 0;
    left: 0;
    cursor: pointer;
    cursor: grab;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(0, 0, 0, 0.1);
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.fc-card:active {
    cursor: grabbing;
}

.fc-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.fc-card.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.fc-card.highlighted {
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
    border: 2px solid gold;
}

/* GPU加速 */
.card,
.fc-card {
    transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
}

/* ========================================
   响应式设计 - 移动端优先，适配所有设备
   ======================================== */

/* 大屏桌面 (≥1920px) */
@media (min-width: 1920px) {
    :root {
        --freecell-spacing: 0.8vw;
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 12vh) / 3.2);
        --freecell-max-card-width: 180px;
        --freecell-max-card-height: 252px;
    }
    
    .freecell-container {
        padding: 1.5vh 1.5vw 4vh;
    }
    
    .freecell-top-area {
        margin-bottom: 2.5vh;
        gap: 1.5vw;
    }
}

/* 标准桌面/笔记本 (1200px - 1919px) */
@media (min-width: 1200px) and (max-width: 1919px) {
    :root {
        --freecell-spacing: 0.7vw;
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 10vh) / 3.3);
    }
    
    .freecell-container {
        padding: 1vh 1vw 3.5vh;
    }
    
    .freecell-top-area {
        margin-bottom: 2vh;
    }
}

/* 平板横屏 (768px - 1199px, landscape) */
@media (min-width: 768px) and (max-width: 1199px) and (orientation: landscape) {
    :root {
        --freecell-spacing: 0.5vw;
        --freecell-card-width-by-width: calc((100vw - 2.5vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 8vh) / 3.6);
        --freecell-min-card-width: 50px;
        --freecell-min-card-height: 70px;
    }
    
    .freecell-container {
        padding: 0.8vh 0.8vw 2.5vh;
    }
    
    .freecell-top-area {
        margin-bottom: 1.5vh;
        gap: 0.8vw;
    }
}

/* 平板竖屏 (768px - 1199px, portrait) */
@media (min-width: 768px) and (max-width: 1199px) and (orientation: portrait) {
    :root {
        --freecell-spacing: 0.6vw;
        --freecell-card-width-by-width: calc((100vw - 2.5vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 18vh) / 3.2);
        --freecell-min-card-width: 55px;
        --freecell-min-card-height: 77px;
    }
    
    .freecell-container {
        padding: 1vh 1vw 3vh;
        min-height: calc(var(--freecell-available-height) - 5vh);
    }
    
    .freecell-top-area {
        margin-bottom: 1.5vh;
    }
}

/* 手机横屏 (≤767px, landscape) */
@media (max-width: 767px) and (orientation: landscape) {
    :root {
        --freecell-spacing: 0.35vw;
        --freecell-card-width-by-width: calc((100vw - 1.8vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 3vh) / 5.2); /* 增大系数到5.2 */
        --freecell-min-card-width: 38px;
        --freecell-min-card-height: 53px;
        --freecell-max-card-width: 62px;  /* 进一步减小 */
        --freecell-max-card-height: 87px;
    }
    
    .freecell-container {
        padding: 0.2vh 0.3vw 0.8vh;
    }
    
    .freecell-top-area {
        margin-bottom: 0.3vh;
        gap: 0.35vw;
    }
    
    .freecell-cell,
    .foundation-pile {
        border-width: 1px;
    }
    
    /* 减小cascade最小高度 */
    .freecell-cascade {
        min-height: calc(var(--card-height) * 1.1);
    }
}

/* 超窄横屏手机 (≤667px landscape，如iPhone SE) */
@media (max-width: 667px) and (orientation: landscape) {
    :root {
        --freecell-spacing: 0.3vw;
        --freecell-card-width-by-width: calc((100vw - 1.5vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 2.5vh) / 5.5);
        --freecell-min-card-width: 36px;
        --freecell-min-card-height: 50px;
        --freecell-max-card-width: 58px;
        --freecell-max-card-height: 81px;
    }
    
    .freecell-container {
        padding: 0.2vh 0.25vw 0.5vh;
    }
    
    .freecell-top-area {
        margin-bottom: 0.2vh;
        gap: 0.3vw;
    }
}

/* 手机竖屏 (481px - 767px) */
@media (min-width: 481px) and (max-width: 767px) and (orientation: portrait) {
    :root {
        --freecell-spacing: 0.5vw;
        --freecell-card-width-by-width: calc((100vw - 2vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 15vh) / 3.3);
        --freecell-min-card-width: 50px;
        --freecell-min-card-height: 70px;
    }
    
    .freecell-container {
        padding: 1vh 0.8vw 3vh;
        min-height: calc(var(--freecell-available-height) - 5vh);
    }
    
    .freecell-top-area {
        margin-bottom: 1.5vh;
        gap: 0.6vw;
    }
}

/* 小屏手机 (361px - 480px) */
@media (min-width: 361px) and (max-width: 480px) {
    :root {
        --freecell-spacing: 0.45vw;
        --freecell-card-width-by-width: calc((100vw - 1.8vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 12vh) / 3.4);
        --freecell-min-card-width: 48px;
        --freecell-min-card-height: 67px;
    }
    
    .freecell-container {
        padding: 0.8vh 0.6vw 3vh;
        min-height: calc(var(--freecell-available-height) - 5vh);
    }
    
    .freecell-top-area {
        margin-bottom: 1.2vh;
        gap: 0.5vw;
    }
}

/* 超小屏手机 (≤360px) */
@media (max-width: 360px) {
    :root {
        --freecell-spacing: 0.4vw;
        --freecell-card-width-by-width: calc((100vw - 1.5vw - 7 * var(--freecell-spacing)) / 8);
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 12vh) / 3.5);
        --freecell-min-card-width: 46px;
        --freecell-min-card-height: 64px;
    }
    
    .freecell-container {
        padding: 0.6vh 0.5vw 3vh;
        min-height: calc(var(--freecell-available-height) - 5vh);
    }
    
    .freecell-top-area {
        margin-bottom: 1vh;
        gap: 0.4vw;
    }
    
    .freecell-cell,
    .foundation-pile {
        border-width: 1px;
    }
}

/* 极宽横屏优化 (aspect-ratio > 2:1) */
@media (min-aspect-ratio: 2/1) and (orientation: landscape) {
    :root {
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 5vh) / 4.2);
        --freecell-spacing: 0.8vw;
    }
    
    .freecell-top-area {
        gap: 1.2vw;
    }
}

/* 极高竖屏优化 (aspect-ratio < 9:16) */
@media (max-aspect-ratio: 9/16) and (orientation: portrait) {
    :root {
        --freecell-card-width-by-height: calc((var(--freecell-available-height) - 20vh) / 3);
    }
    
    .freecell-container {
        padding-bottom: 5vh;
        min-height: calc(var(--freecell-available-height) - 8vh);
    }
}

/* ========================================
   移动端触摸优化
   ======================================== */

/* 游戏区域 - 允许页面正常滚动 */
.game-board {
    min-height: var(--freecell-available-height);
    position: relative;
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .card {
        -webkit-tap-highlight-color: rgba(255, 215, 0, 0.2);
        tap-highlight-color: rgba(255, 215, 0, 0.2);
        touch-action: manipulation;
    }
    
    .card:active {
        transform: scale(0.95) translateZ(0);
    }
    
    .freecell-cell:active,
    .foundation-pile:active {
        transform: scale(0.98);
    }
}

/* 移动端专用：优化滚动体验 */
@media (max-width: 768px) {
    body {
        -webkit-overflow-scrolling: touch;
    }
    
    .game-board {
        overflow: visible;
    }
    
    /* 竖屏时添加底部渐变提示 */
    @media (orientation: portrait) {
        .freecell-container::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 40px;
            background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.1));
            pointer-events: none;
            z-index: 10;
        }
    }
}

/* 横屏模式下最小化 header 高度 */
@media (max-width: 767px) and (orientation: landscape) {
    .unified-header {
        min-height: 50px;
        padding: 0.3rem 0.5rem;
    }
    
    .brand-section {
        font-size: 0.9rem;
    }
    
    .action-btn-compact {
        padding: 0.3rem 0.5rem;
        font-size: 0.85rem;
    }
    
    .stat-compact {
        font-size: 0.85rem;
    }
}

/* ========================================
   拖拽状态样式
   ======================================== */
.card.dragging {
    opacity: 0.6;
    z-index: 1000;
}

.freecell-cascade.drag-over,
.freecell-cell.drag-over,
.foundation-pile.drag-over {
    border-color: #ffd700;
    background: rgba(255, 215, 0, 0.15);
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.5);
}

/* ========================================
   提示动画
   ======================================== */
.hint-highlight,
.hint-target {
    animation: hintPulse 1.5s ease-in-out 2;
    border-color: gold !important;
}

.hint-card {
    position: fixed !important;
    z-index: 10000 !important;
    pointer-events: none !important;
}

@keyframes hintPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 rgba(255, 215, 0, 0);
    }
    50% {
        transform: scale(1.08);
        box-shadow: 0 0 25px 10px rgba(255, 215, 0, 0.8);
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .unified-header,
    .seo-content-section {
        display: none;
    }
    
    .freecell-container {
        max-width: 100%;
    }
}