/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f0f23 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
}

/* ===== 头部 ===== */
.header {
    width: 100%;
    padding: 8px 15px;
    text-align: center;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.game-title {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, #00f5ff, #bc13fe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== HUD ===== */
.hud {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    padding: 8px 12px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.hud-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: #94a3b8;
}

.hud-icon {
    font-size: 14px;
}

.hud-label {
    font-size: 11px;
}

.hud-value {
    font-weight: 700;
    color: #fff;
    font-size: 14px;
    min-width: 24px;
    text-align: center;
}

.time-bar {
    width: 60px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.time-fill {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #22c55e, #eab308, #ef4444);
    border-radius: 3px;
    transition: width 0.5s linear;
}

.hud-item.combo {
    animation: comboPulse 0.5s ease;
}

@keyframes comboPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* ===== 难度选择 ===== */
.difficulty-bar {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 4px 12px;
    flex-shrink: 0;
}

.diff-btn {
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    color: #94a3b8;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s;
}

.diff-btn.active, .diff-btn:hover {
    background: linear-gradient(135deg, #bc13fe, #ff006e);
    border-color: transparent;
    color: #fff;
    font-weight: 600;
}

/* ===== 游戏棋盘 ===== */
.game-board {
    display: grid;
    gap: 3px;
    padding: 6px;
    margin: 0 auto;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    flex: 1;
    width: 100%;
    max-width: min(98vw, 680px);
    min-height: 50vh;
    min-width: 0;
    overflow: visible;
    grid-auto-rows: 1fr;
    align-content: start;
}

/* 单元格 */
.cell {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(16px, 4.5vw, 28px);
    cursor: pointer;
    border-radius: 6px;
    background: linear-gradient(135deg, #2a2a4e 0%, #1a1a3e 100%);
    border: 2px solid rgba(255, 255, 255, 0.08);
    transition: all 0.2s ease;
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 36px;
    min-width: 36px;
}

.cell:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.cell.selected {
    border-color: #fbbf24;
    box-shadow: 0 0 15px rgba(251, 191, 36, 0.5), inset 0 0 10px rgba(251, 191, 36, 0.2);
    transform: scale(1.1);
    animation: selectedPulse 1s ease infinite;
    z-index: 2;
}

@keyframes selectedPulse {
    0%, 100% { box-shadow: 0 0 15px rgba(251, 191, 36, 0.5), inset 0 0 10px rgba(251, 191, 36, 0.2); }
    50% { box-shadow: 0 0 25px rgba(251, 191, 36, 0.8), inset 0 0 15px rgba(251, 191, 36, 0.4); }
}

.cell.matched {
    animation: matchPop 0.4s ease forwards;
    pointer-events: none;
}

@keyframes matchPop {
    0% { transform: scale(1.1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.6; }
    100% { transform: scale(0); opacity: 0; }
}

.cell.shake {
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

.cell.hint {
    animation: hintPulse 1s ease infinite;
    border-color: #22c55e;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.4);
}

@keyframes hintPulse {
    0%, 100% { box-shadow: 0 0 10px rgba(34, 197, 94, 0.4); }
    50% { box-shadow: 0 0 20px rgba(34, 197, 94, 0.8); }
}

.cell.empty {
    background: transparent;
    border: 2px dashed rgba(255, 255, 255, 0.05);
    pointer-events: none;
    opacity: 0.3;
}

/* ===== 连线层 ===== */
.line-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.line-path {
    fill: none;
    stroke: url(#lineGrad);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    filter: drop-shadow(0 0 4px #00f5ff);
    animation: lineDraw 0.3s ease forwards;
}

@keyframes lineDraw {
    from { stroke-dasharray: 1000; stroke-dashoffset: 1000; }
    to { stroke-dasharray: 1000; stroke-dashoffset: 0; }
}

/* ===== 粒子层 ===== */
.particle-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
}

.particle {
    position: absolute;
    font-size: 14px;
    animation: particleFly 0.8s ease forwards;
    pointer-events: none;
}

@keyframes particleFly {
    0% { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--tx), var(--ty)) scale(0); opacity: 0; }
}

/* ===== 底部工具栏 ===== */
.toolbar {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 8px 12px;
    flex-shrink: 0;
}

.tool-btn {
    position: relative;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    color: #fff;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.tool-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.tool-count {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: #ef4444;
    border-radius: 50%;
    font-size: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== 控制按钮 ===== */
.controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 8px 12px 16px;
    flex-shrink: 0;
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #00f5ff, #00ccff);
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 245, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-home {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.btn-home:hover {
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

/* ===== 弹窗 ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: linear-gradient(135deg, #1a1a3e 0%, #0f0f23 100%);
    padding: 30px 40px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    max-width: 90%;
    width: 320px;
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ff006e, #00f5ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.modal-content .btn {
    width: 100%;
    margin: 8px 0;
}

/* ===== 诊断弹窗样式（由 diagnosis.js 动态插入） ===== */
#diagnosisModal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.92);
    z-index: 99999;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    touch-action: pan-y !important;
}

#diagnosisModal > div {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-radius: 20px;
    padding: 30px;
    max-width: 420px;
    width: 90%;
    border: 2px solid rgba(255, 255, 255, 0.1);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
    touch-action: pan-y !important;
    -webkit-overflow-scrolling: touch;
}

/* ===== 响应式 ===== */
@media (max-width: 480px) {
    .hud {
        gap: 10px;
        padding: 6px 8px;
    }
    
    .hud-item {
        font-size: 11px;
    }
    
    .hud-value {
        font-size: 12px;
    }
    
    .game-board {
        gap: 3px;
        padding: 6px;
    }
    
    .cell {
        font-size: min(6vw, 22px);
        border-radius: 6px;
        min-height: 32px;
    }
    
    .toolbar {
        gap: 8px;
    }
    
    .tool-btn {
        padding: 8px 12px;
        font-size: 16px;
    }
    
    .controls {
        gap: 8px;
    }
    
    .btn {
        padding: 8px 18px;
        font-size: 13px;
    }
}