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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-image: linear-gradient(0deg, #eee 1px, transparent 0),
    linear-gradient(90deg, #eee 1px, transparent 0);
    background-size: 30px 30px;
    color: #333;
    min-height: 100dvh;
    overflow: hidden;
}

body.is-mobile {
    overflow-y: auto;
}

#board {
    position: relative;
    width: 100vw;
    height: 100dvh;
    overflow: hidden;
}

body.is-mobile #board {
    height: auto;
    min-height: 100dvh;
}

.card {
    position: absolute;
    width: 220px;
    border-radius: 12px;
    box-shadow: 0 16px 35px rgba(0, 0, 0, 0.2);
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    overflow: hidden;
    opacity: 0;
    transform-origin: center;
    transition: transform 0.35s ease, opacity 0.35s ease, left 0.35s ease,
    top 0.35s ease, width 0.35s ease, height 0.35s ease,
    border-radius 0.35s ease;
}

.card.dragging {
    transition: none;
    box-shadow: 0 22px 45px rgba(0, 0, 0, 0.35);
}

.card.maximized {
    box-shadow: 0 28px 60px rgba(0, 0, 0, 0.4);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.7);
    cursor: grab;
    user-select: none;
    touch-action: pan-y;
}

.card-header.dragging {
    cursor: grabbing;
}

.window-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}

.window-controls .control {
    position: relative;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: #ccc;
    cursor: pointer;
    outline: none;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.window-controls .control.close {
    background: #ff5f57;
    border-color: #e0443e;
}

.window-controls .control.minimize {
    background: #febb2e;
    border-color: #dea123;
}

.window-controls .control.maximize {
    background: #28c840;
    border-color: #1aab2c;
}

.window-controls .control::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.card-header:hover .window-controls .control::after {
    opacity: 0.8;
}

.window-controls .control.close::after {
    content: '×';
    width: auto;
    height: auto;
    background: none;
    font-size: 10px;
    line-height: 1;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.7);
}

.window-controls .control.minimize::after {
    width: 6px;
    height: 2px;
    background: rgba(0, 0, 0, 0.6);
}

.window-controls .control.maximize::after {
    width: 6px;
    height: 6px;
    background: linear-gradient(
            45deg,
            rgba(0, 0, 0, 0.6) 0%,
            rgba(0, 0, 0, 0.6) 45%,
            transparent 45%,
            transparent 55%,
            rgba(0, 0, 0, 0.6) 55%,
            rgba(0, 0, 0, 0.6) 100%
    );
}

.card-title {
    font-size: 13px;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.55);
    padding-left: 10px;
    flex: 1;
}

.card-body {
    padding: 16px;
    font-size: 16px;
    line-height: 1.4;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.72);
}

@media (max-width: 768px) {
    .card {
        width: 180px;
        border-radius: 10px;
    }

    .card-body {
        padding: 14px;
        font-size: 14px;
    }

    .card-title {
        font-size: 12px;
    }
}